Maglev windmill project report

33
A Report on Project Stage II “TO ADVANCED IMPLEMENT AND DESIGN OF MAGLEV WIND MIL” Submitted in partial fulfillment for the award of Degree of Bachelor of Technology in Electrical Engineering Session: 2015-16 Submitted to: Guided by: Submitted by: Mr. Kapil Parikh Mr. Rohit Aheer Rahul Mehra Head of Department Assistant Professor 12E1SHEEM1XP031 (Electrical Engineering) (Electrical Engineering) DEPARTMENT OF ELECTRICAL ENGINEERING SHRINATHJI INSTITUTE OF TECHNOLOGY & ENGINEERING (Affiliated To RTU Kota, Rajasthan) March-April, 2016

Transcript of Maglev windmill project report

Page 1: Maglev windmill project report

A Report on

Project Stage II “TO ADVANCED IMPLEMENT AND DESIGN OF

MAGLEV WIND MIL” Submitted in partial fulfillment for the award of D egree of

Bachelor of Technology in Electrical Engineering

Session: 2015-16

Submitted to: Guided by: Submitted by:

Mr. Kapil Parikh Mr. Rohit Aheer Rahul Mehra

Head of Department Assistant Professor 12E1SHEEM1XP031

(Electrical Engineering) (Electrical Engineering)

DEPARTMENT OF ELECTRICAL ENGINEERING

SHRINATHJI INSTITUTE OF TECHNOLOGY & ENGINEERING

(Affiliated To RTU Kota, Rajasthan)

March-April, 2016

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CANDIDATE’S DECLARATION

I hereby declare that the work, which is being presented in the Project, entitled “To

Advanced Implement And Design of Maglev Wind Mill” in partial fulfillment for the

award of Degree of “Bachelor of Technology” in Department of Electrical Engineering and

submitted to, Shrinathji Institute of Technology & Engineering, Nathdwara, affiliated to

Rajasthan Technical University as a record of our own investigations carried under the

Guidance of Mr. Rohit Aheer, Dept. of Electrical Engineering, Shrinathji Institute of

Technology & Engineering, Nathdwara.

Name of student Enrolment No. Signature

Rahul Mehra 12E1SHEEM1XP031

Electrical Engineering

Shrinathji Institute of Technology & Engineering,

Nathdwara

Counter Signed by Counter Signed by

Supervisor H.O.D

Mr. Rohit Aheer Mr. Kapil Parikh

(Assistant Professor) (Head of Department)

Dept. of Electrical Engineering, Dept. of Electrical Engineering,

SITE, Nathdwara SITE, Nathdwara

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CERTIFICATE

This is to certify that this Project entitled “To Advanced Implement and Design of Maglev

Wind Mill” has been successfully carried out by Nagendra Singh Rao

(12E1SHEEM1XP031) under our supervision and guidance, in partial fulfillment of the

requirement for the award of Bachelor of technology in Electrical Engineering from

Shrinathji Institute of Technology & Engineering, Nathdwara (Rajasthan) for the Year

2015-16.

Supervisor Submitted To

Mr. Rohit Aheer Mr. Kapil Parikh

(Assistant Professor) (Head of Department)

Dept. of Electrical Engineering, Dept. of Electrical Engineering,

SITE, Nathdwara SITE, Nathdwara

Place: NATHDWARA

Date:

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ACKNOWLEDGEMENT

I wish to express my deep sense of gratitude towards our guide Mr. Rohit Aheer (Assistant

Professor, Electrical Engineering Department), Shrinathji Institute of Technology

&Engineering for his guidance and encouraging support which were invaluable for the

completion of this work.

Words are inadequate in offering our thanks to Mr. Kapil Parikh H.O.D., Electrical

Engineering Department, Shrinathji Institute of Technology & Engineering for his

encouragement and cooperation in carrying out the project work.

I sincere thanks are due to Dr. A. N. Mathur , Director Admistrative, Shrinathji Institute of

Technology & Engineering and Dr. Mahesh Kumar Porwal, Principle, Shrinathji Institute of

Technology & Engineering for his special help. I take immense pleasure in thanking all the

faculty members, staff members and our colleagues for their valuable assistance in the project

work. I would like to express us special thanks to our family, our friends and all those who

helped us directly or indirectly in completion of this project work.

Rahul Mehra

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CONTENTS

TITLE PAGE NO.

Candidate’s Declaration

Certificate

Acknowledgement

Contents i

List of Figures iii

Abstract 1

1 Introduction 2-4

1.1 Project motivation 3

1.2 Objectives of the Project 4

1.3 Organization of Project 4

2 Literature Survey 5

3 Theory Related to Maglev Windmill 7

4 Design of Maglev Windmill 10-21

4.1 Main Block Diagram 10

4.2 Working 10

4.3 Principle 13

4.4 Complete Description of Maglev Windmill 13

4.4.1 Circuit Diagram 14

4.5 Component Description 15

4.5.1 Neodymium Magnets 15

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4.5.1.1 Magnet Placement 16

4.5.2 Coils 17

4.5.2.1 Coil Arrangement 18

4.5.3 Wind Sail 18

4.5.4 AC–DC Conversion Module 20

4.6 Snap Shots 21

5. Result Analysis 24

6. Conclusion and Future Scope 25

REFERENCES iv

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LIST OF FIGURES

FIGURE NO. DESCRIPTION OF FIG. PAGE NO.

Chapter: 4

4.1 Block Diagram of Maglev Windmill 10

4.2 Working model of maglev wind turbine 11

4.3 Concept of Magnetic Levitation 13

4.4 Circuit Diagram 14

4.5 Neodymium Magnet 16

4.6 Magnet Placement 16

4.7 Coils 17

4.8 Coil Arrangement 18

4.9 Wind Sail 19

4.10 AC–DC conversion module 20

4.11 Coil Placement 21

4.12 Magnet Placement 21

4.13 Actual View of the Maglev Windmill 22

after Completion of project

4.14 Front View of the maglev Windmill 23

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ABSTRACT

This project dwells on the implementation of an alternate configuration of a wind turbine for

power generation purposes. Using the effects of magnetic repulsion, spiral shaped wind

turbine blades will be fitted on a rod for stability during rotation and suspended on magnets

as a replacement for ball bearings which are normally used on conventional wind turbines.

Power will then be generated with an axial flux generator, which incorporates the use of

permanent magnets and a set of coils. The selection of magnet materials in the design of wind

turbine system will be discussed. A model of wind turbine is built to perform several tests

such as starting wind speed, rotational speed at constant wind speed, and time taken to stop

rotation completely. The results obtained will be compared with the model of conventional

wind turbine. Power will then be generated with an axial flux generator, which incorporates

the use of permanent magnets and a set of coils.

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Chapter-1

INTRODUCTION

Renewable energy is generally electricity supplied from sources, such as wind power, solar

power, geothermal energy, hydropower and various forms of biomass. These sources have

been coined renewable due to their continuous replenishment and availability for use over

and over again. The popularity of renewable energy has experienced a significant upsurge in

recent times due to the exhaustion of conventional power generation methods and increasing

realization of its adverse effects on the environment. This popularity has been bolstered by

cutting edge research and ground breaking technology that has been introduced so far to aid

in the effective tapping of these natural resources and it is estimated that renewable sources

might contribute about 20% – 50% to energy consumption in the latter part of the 21st

century. Facts from the World Wind Energy Association estimates that by 2010, 160GW of

wind power capacity is expected to be installed worldwide which implies an anticipated net

growth rate of more than 21% per year.

This project focuses on the utilization of wind energy as a renewable source. In the United

States alone, wind capacity has grown about 45% to 16.7GW and it continues to grow with

the facilitation of new wind projects. The aim of this major qualifying project is to design and

implement a magnetically levitated vertical axis wind turbine system that has the ability to

operate in both high and low wind speed conditions. Our choice for this model is to showcase

its efficiency in varying wind conditions as compared to the traditional horizontal axis wind

turbine and contribute to its steady growing popularity for the purpose of mass utilization in

the near future as a reliable source of power generation.

Unlike the traditional horizontal axis wind turbine, this design is levitated via maglev

(magnetic levitation) vertically on a rotor shaft. This maglev technology, which will be

looked at in great detail, serves as an efficient replacement for ball bearings used on the

conventional wind turbine and is usually implemented with permanent magnets. This

levitation will be used between the rotating shaft of the turbine blades and the base of the

whole wind turbine system. The conceptual design also entails the usage of spiral shaped

blades and with continuing effective research into the functioning of sails in varying wind

speeds and other factors, an efficient shape and size will be determined for a suitable turbine

blade for the project. With the appropriate mechanisms in place, we expect to harness enough

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wind for power generation by way of an axial flux generator built from permanent magnets

and copper coils. The arrangement of the magnets will cultivate an effective magnetic field

and the copper coils will facilitate voltage capture due to the changing magnetic field. The

varying output voltage obtained at this juncture will then be passed through a DC-DC

converter to achieve a steady output DC voltage.

1.1 Project Motivation

The purpose of this project was to create frictionless bearings and a magnetic levitation

design of windmills which is the issue in conventional wind turbines. It also requires little if

any maintenance. Maglev wind turbines have several advantages over conventional wind

turbines. For instance, they’re able to use winds with starting speeds as low as 1.5 meters per

second (m/s). Also, they could operate in winds exceeding 40 m/s. It would also increase

generation capacity by 20% over conventional wind turbines and decrease operational costs

by 50%.

This makes the efficiency of the system higher than conventional wind turbine. Currently, the

largest conventional wind turbines in the world produce only five megawatts of power.

However, one large maglev wind turbine could generate one GW of clean power, enough to

supply energy to 75,000 homes. The turbine uses permanent type of rare earth magnets

(neodymium) instead of electro-magnets and therefore it doesn’t require electricity to run.

The friction between the turbine blades and the base can maximum power output. In selecting

the vertical axis concept for the wind turbine that is implemented as the power generation

portion of this project, certain uniqueness corresponded to it that did not pertain to the other

wind turbine designs.

The characteristic that set this wind generator apart from the others is that it is fully

supported and rotates about a vertical axis. This axis is vertically oriented through the center

of the wind sails, which allows for a different type of rotational support rather than the

conventional ball bearing system found in horizontal wind turbines. This support is called

maglev, which is based on magnetic levitation. Maglev offers a near frictionless substitute for

ball bearings with little to no maintenance. These winds are usually found along shore lines,

mountain tops, valleys and open plains. This type of wind is not conducive for effective

power generation; it only has a lot of worth when it accompanies moving planetary winds. In

later chapters, more focus will be placed on the power of wind and effective ways to design

wind turbines for optimal wind power production.

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The latter is the most dominant and it is usually a major factor in deciding sites for very

effective wind turbines especially with the horizontal axis types. Undoubtedly, the project’s

ability to function is solely dependent on the power of wind and its availability. With wind

turbines, two categories of winds are relevant to their applications, namely local winds and

planetary winds.

1.2 Objectives of the Project

� To create new opportunities in low-speed areas, with starting speed as low as 1.5m/s.

� By use of Magnetic levitation to reduces the friction & eliminates need of bearings in

wind mill.

� To convert wind energy into electrical energy remarkably cheap with low operating

cost.

� By use of Magnetic levitation due to absence of friction to convert energy with very

less noise production compare to existing conventional wind mills.

1.3 Organization of Project

Chapter-1: - We’ve associated the introduction of Maglev Windmill which is magnetically

levitated Windmill, object and organization of Project.

Chapter-2: - We’ve engaged the Literature survey according to last decade.

Chapter-3: - We’ve discussed distribution of the various terminology used in this project,

overview of maglev windmill.

Chapter-4: - We’ve associated design of proposed work, main circuit diagram, block

diagram, working of maglev windmill.

Chapter-5: - We’ve associated different type of component used in the project of maglev

windmill, neodymium magnets, coils, rotor, magnet and coil placing circular sheets, etc. and

snap shot.

Chapter-6: - Result analysis and discussion.

Chapter-7: - Conclusion and future scope of Maglev Windmill.

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Chapter-2

LITERATURE SURVEY

In this chapter we’ve discussed about the last decade literature survey for the advanced

implement and design of maglev wind mill with additional solar power generation. We’ve

found some proposed literature survey given below:

Vishal D Dhareppagol et al. [1] proposed this new model of wind turbine uses magnetic

levitation to reduce the internal friction of the rotor which is considered as a revolution in the

field of wind technology, producing 20% more energy than a conventional turbine, at the

same time decreasing operational costs by 50% over the traditional wind turbine. Hence this

technology provides an extreme efficient, versatile and elegant method of producing power

from wind with nearly zero pollution. Our choice for this model is to showcase its efficiency

in varying wind conditions as compared to the traditional horizontal axis wind turbine and

contribute to its steady growing popularity for the purpose of mass utilization in the near

future as a reliable source of power generation.

Minu John et al. [2] proposed Magnetic pressure is used to counteract the effects of the

gravitational and any other accelerations. The principal advantage of a maglev windmill from

a conventional one is, as the rotor is floating in the air due to levitation, mechanical friction is

totally eliminated. That makes the rotation possible in very low wind speeds. Maglev wind

turbines have several advantages over conventional wind turbines. For instance, they’re able

to use winds with starting speeds as low as 1.5 meters per second (m/s). Also, they could

operate in winds exceeding 40 m/s.

Dinesh N Nagarkar et.al. [3] Proposed electricity can be obtained by converting kinetic

energy of wind into electrical energy by using wind turbine. There are two types of wind

turbine, one is conventional wind turbine and other is maglev wind turbine, but generation of

electricity using maglev technology is now becoming more competitive. It works on the

principle of electromagnetism. It has colossal structure. It has several advantages over

conventional wind turbine and has certain applications.

Richard D. Thornton et.al. [4] Proposed Maglev has the potential to be more efficient and

affordable than alternative technologies for many transportation applications. To achieve this

potential we need new designs that build on what we have learned from existing maglev

designs, while taking advantage of supporting technology that did not exist when most of

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them were created. The keys to reducing energy intensity are to use light vehicles with low

aerodynamic drag, use a linear synchronous motor that is excited in short sections, and

operate with a dynamic schedule that achieves a high load factor. The key to affordability is

to use small, light vehicles that can operate on less expensive guide ways, and require less

power for propulsion. This paper provides more details on these issues, provides estimates of

what is feasible with today’s technology, and discusses how to choose performance

parameters, such as speed and acceleration, so as to maximize the probability that maglev

will become the technology of choice for a wide range of applications. It also includes an

historical perspective and recommendations for future development.

Pankaj R Amratan Ingle et.al. [5] focused on the implementation of maglev principle on

vertical axis wind turbine so as to use in not only for industrial purposes but also every home

can be use renewable energy to en light their lives and to become a part of healthy society to

live in a beautiful , pollution free environment. As we all know the today fossil fuel rates,

availability, their impact on environment, if they will use continuously in a proportion now

we are using then it will be not possible to live on earth & some peoples already started to

plan to live on the moon and mars. Joke so far. By placing the magnets below the vertical

rotor of the wind turbine and on the base of the frame ,so that because of magnetic repulsion

the rotor will required very low starting wind speed, and there is very less friction and it

replaces conventional ball bearing.

Nianxian Wang et.al. [6] Proposed Maglev wind turbine generator (MWTG) technology has

been widely studied due to its low loss, low maintenance cost, and high reliability. However,

the dynamics of the magnetic bearing system differ from the traditional mechanical bearing

system. A horizontal axial MWTG supported with a permanent magnetic bearing is designed

in this research and the radial forces and the natural frequencies of the rotor system are

studied. The results show that the generator has a cyclical magnetic force and an

unreasonable bearing stiffness may mean that the rotor system needs to work in the resonance

region; the bearing stiffness is the key factor to avoid this problem.

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Chapter-3

ADVANCED IMPLEMENT AND DESIGN OF MAGLEV WIND MILL

The purpose of this project was to create Magnetic levitation weight reduction structure for a

vertical wind turbine generator includes a frame, a fixed permanent magnet, an axle, a

revolving permanent magnet, a blade hub, and a generator. The fixed permanent magnet fixed

to the frame has a first repulsive surface. The axle is connected to the frame. The revolving

permanent magnet fixed to the axle has a second repulsive surface in relation to the first

repulsive surface of the fixed permanent magnet. Both the first and the second repulsive

surfaces repel with each other. The blade hub and the generator are connected to the axle.

When the revolving permanent magnet is rotated, the axle functions as a balance center. An

out structure supports the stator and the rotor is placed over turbine head.

The main components of the system are the maglev zone, blade hub and Auxiliary Current

(AC) generator. It will convert the kinetic energy from the wind to the electricity for usage. A

modified roof ventilator is used as wind turbine. The main function of the free spinning roof

ventilator is to provide fresh air in roof space and living area all year round 24 hours a day

free of charge. The new idea of the magnetic levitation helps to improve the turbine speed

and electrical production. This modification has benefits of the better air ventilation, but also

has extra electricity supply for load appliances. The concept behind wind turbine vents is that

the turning blades will help force air out of the attic. The blades or vanes are shaped to allow

for maximum wind catching ability, resulting in rotation at minimal winds speeds of 8 kph or

lower. This project demonstrates the utilization of the renewable resource (wind energy) in an

efficient way. This type of generation can be used in remote places where conventional

power supply is uneconomic. The methodology can be used for hybrid power generation.

Generated power by this method can be used ON and OFF grid. The power so generated can

be effectively used for Street/domestic lighting and domestic appliances. Inclusion of inverter

the power generated can be used for both AC as well as DC loads.

Now a day, we will ultimately need to search for renewable or virtually inexhaustible energy

for the human development to continue. Renewable energy is generally electricity supplied

from sources, such as wind power, solar power, geothermal energy, hydropower and various

forms of biomass. The popularity of renewable energy has experienced a significant upsurge

in recent times due to the exhaustion of conventional power generation methods. The

exploration of renewable energy is the only approach to reduce our dependence on fossil

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fuels. Among the renewable energy sources Wind Energy is one of the fastest growing

energy sources which is growing at the rate of 30% annual graph

The wind speeds in most of Asian zone is much lower than 7 m/s, especially in the cities, but

the mechanical frictional resistance of existing wind turbines is too big, usually it can't start

up when the wind speed is not big enough. This project introduces structure and principle of

the proposed magnetic levitation wind turbine for better utilization of wind energy. Maglev

Wind turbine has the features of no mechanical contact, no friction etc. minimizing the

damping in the magnetic levitation wind turbine, which enables the wind turbine start up with

low speed wind and work with breeze.

The Maglev wind turbine, which was first unveiled at the Wind Power Asia exhibition in

Beijing, is expected take wind power technology to the next level with magnetic levitation.

Magnetic Levitation (Maglev) into turbine system in order to increases the efficiency. If the

efficiency of a wind turbine is increased, then more power can be generated thus decreasing

the need for expensive power generators that cause pollution. Since one of the main

complaints about wind turbines is the sound they produce, this is a huge advantage over other

turbine designs.

Many types of turbines exist today and their designs are usually inclined towards one of the

two categories: horizontal-axis wind turbines (HAWTs) and vertical-axis wind turbines

(VAWTs). As the name pertains, each turbine is distinguished by the orientation of their rotor

shafts. The former is the more conventional and common type everyone has come to know,

while the latter due to its seldom usage and exploitation, is quiet unpopular. The HAWTs

usually consist of two or three propeller-like blades attached to a horizontal and mounted on

bearings the top of a support tower.

When the wind blows, the blades of the turbine are set in motion which drives a generator

that produces AC electricity. For optimal efficiency, these horizontal turbines are usually

made to point into the wind with the aid of a sensor and a servomotor or a wind vane for

smaller wind turbine applications. With the vertical axis wind turbines, the concept behind

their operation is similar to that of the horizontal designs. The major difference is the

orientation of the rotors and generator, which are all vertically arranged, and usually on a

shaft for support and stability. This also results in a different response of the turbine blades to

the wind in relation to that of the horizontal configurations.

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Their design makes it possible for them to utilize the wind power from every direction unlike

the HAWTs that depend on lift forces from the wind similar to the lift off concept of an

airplane. Vertical axis wind turbines are further subdivided into two major types namely the

Darrieus model and the Savonius model. Darrieus Model which was named after designer

and French aeronautical engineer, Georges Darrieus. This form of this design is best de-

scribed as an eggbeater with the blades, two or three of them bent into a c-shape on the shaft.

Finnish engineer Sigurd Savonius invented the Savonius model. The functioning of this

model is dependent on drag forces from the wind. This drag force produced is a differential

of the wind hitting by the inner part of the scoops and the wind blowing against the back of

the scoops. Like the Darrieus model, the Savonius turbines will work with winds approaching

in any direction and also work well with lower wind speeds due to their very low clearance

off the ground. With the vertical axis wind turbines, the concept behind their operation is

similar to that of the horizontal designs. The major difference is the orientation of the rotors

and generator, which are all vertically arranged, and usually on a shaft for support and

stability. This also results in a different response of the turbine blades to the wind in relation

to that of the horizontal configurations.

Regenedyne Maglev Wind Power Generation (RMWPG) is the advanced method of

harnessing the kinetic energy of wind. The word Regenedyne means generation by renewable

source (wind) and in this type of generation the spinning turbine floats on the magnetic

cushion, just as the high-speed train floats above the rail track hence the name Regenedyne

Maglev Wind Power Generation. The Maglev wind turbine design is a vast departure from

conventional propeller designs. Its main advantages are that it uses frictionless bearings and a

magnetic levitation design and it does not need to vast spaces required by more conventional

wind turbines. It also requires little if any maintenance.

The Maglev wind turbine was first unveiled at the Wind Power Asia exhibition in Beijing

2007. The unique operating principle behind this design is through magnetic levitation.

Magnetic levitation is supposedly an extremely efficient system for wind energy. The

vertically oriented blades of the wind turbine are suspended in the air replacing any need for

ball bearings.

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Chapter-4

DESIGN OF MAGLEV WINDMILL

4.1 Main Block Diagram

Fig.4.1: Block Diagram of Maglev Windmill

4.2 Working

Figure gives an idea of Maglev Wind Turbine. This phenomenon operates on the repulsion

characteristics of permanent magnets. This technology has been predominantly utilized in the

rail industry in the Far East to provide very fast and reliable transportation on maglev trains

and with ongoing research its popularity is increasingly attaining new heights. Using a pair of

permanent magnets like neodymium magnets and substantial support magnetic levitation can

easily be experienced. By placing these two magnets on top of each other with like polarities

facing each other, the magnetic repulsion will be strong enough to keep both magnets at a

distance away from each other. The force created as a result of this repulsion can be used for

suspension purposes and is strong enough to balance the weight of an object depending on

Coils Placement

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The threshold of the magnets. Power will then be generated with an axial flux generator,

which incorporates the use of permanent magnets and a set of coils.

The generated power is in form of DC, stored in battery, this can be used to directly supply

the DC loads and can also be converted to AC using inverter to supply AC loads. It can be

used as OFF grid and ON grid as shown in above figures. Wind power is a proven and highly

effective way to generate electricity. Maglev technology is the most efficient means of

transferring kinetic energy to generate electricity. The vertical axis wind turbine platform

floats on a magnetic cushion with the aid of permanent- magnet suspension and a companion

linear synchronous motor. This technology eliminates nearly all friction and delivers

maximum wind energy to the downstream linear generator.

Fig 4.2 Working model of maglev wind turbine

The characteristic that set this wind generator apart from the others is that it is fully supported

and rotates about a vertical axis. This axis is vertically oriented through the center of the wind

Energy Loss

Kinetic Energy

Kinetic Energy (Wind before exiting the wind turbine) Kinetic Energy (Wind before

entering the wind turbine)

Magnetic levitation

Blades

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vent which allows for a different type of rotational support rather than the conventional ball

bearing system found in horizontal wind turbines. This figure shows a basic rendition of how

the maglev will be integrated into the design. If the magnets where ring shaped then they

could easily be slid tandem down the shaft with the like poles facing toward each other. This

would enable the repelling force required to support the weight and force of the wind turbine

and minimize the amount of magnets needed to complete the concept.

Magnetic Levitation

This phenomenon operates on the repulsion characteristics of permanent magnets. Using a

pair of permanent magnets like neodymium magnets and substantial support magnetic

levitation can easily be experienced. By placing two magnets on top of each other with like

polarities facing each other, the magnetic repulsion will be strong enough to keep both

magnets at a distance away from each other. The force created as a result of this repulsion can

be used for suspension purposes and is strong enough to balance the weight of an object. In

this project, we expect to implement this technology for the purpose of achieving vertical

orientation with our rotors. In the designed prototype, the stator and rotor are separated in the

air using the principle of magnetic levitation.

The rotor is lifted by a certain centimeters in the air by the magnetic pull forces created by the

ring type Neodymium magnets. This is the principal advantage of a maglev windmill from a

conventional one. That is, as the rotor is floating in the air due to levitation, mechanical

friction is totally eliminated. That makes the rotation possible in very low wind speeds. In

selecting the vertical axis concept for the wind turbine that is implemented as the power

generation portion of this project, certain uniqueness corresponded to it that did not pertain to

the other wind turbine designs. The characteristic that set this wind generator apart from the

others is that it is fully supported and rotates about a vertical axis. This axis is vertically

oriented through the center of the wind sails, which allows for a different type of rotational

support rather than the conventional ball bearing system found in horizontal wind turbines.

This support is called maglev, which is based on magnetic levitation. Maglev offers a near

frictionless substitute for ball bearings with little to no maintenance. The four different

classes are Alnico, Ceramic, Samarium Cobalt and Neodymium Iron Boron also known

Nd- Fe-B. Nd-Fe-B is the most recent addition to this commercial list of materials and at

room temperature exhibits the highest properties of all of the magnetic materials. The force

created as a result of this repulsion can be used for suspension purposes and is strong enough

to balance the weight of an object.

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Fig 4.3 Concept of Magnetic Levitation

4.3 Principle

The basic working principle of a wind turbine is when air moves quickly, in the form of

wind, the kinetic energy is captured by the turbine blades. The blades start to rotate and spin a

shaft that leads from the hub of the rotor to a generator and produce electricity. The high

speed shaft drives the generator to produce electricity. The low speed shaft of wind turbine is

connected to shaft of high speed drives through gears to increase their rotational speed during

operation. Using the effects of magnetic repulsion, spiral shaped wind turbine blades will be

fitted on a rod for stability during rotation and suspended on magnets as a replacement for

ball bearings which are normally used on conventional wind turbines. The energy that can be

extracted from the wind is directly proportional to the cube of the wind speed. We can then

calculate the power converted from the wind into rotational energy in the turbine using

equation

4.4 Complete Description of Maglev Windmill

In this project Magnetic levitation weight reduction structure for a vertical wind turbine

generator included. The fixed permanent magnet fixed to the frame has a first repulsive

surface. The axle is connected to the frame. The revolving permanent magnet fixed to the

axle has a second repulsive surface in relation to the first repulsive surface of the fixed

permanent magnet. Both the first and the second repulsive surfaces repel with each other. The

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blade hub and the generator are connected to the axle. When the revolving permanent magnet

is rotated, the axle functions as a balance center. An out structure supports the stator and the

rotor is placed over turbine head. The main components of the system are the maglev zone,

blade hub and Auxiliary Current (AC) generator. It will convert the kinetic energy from the

wind to the electricity for usage. A modified roof ventilator is used as wind turbine. The main

function of the free spinning roof ventilator is to provide fresh air in roof space and living

area all year round 24 hours a day free of charge. The new idea of the magnetic levitation

helps to improve the turbine speed and electrical production. This modification has benefits

of the better air ventilation, but also has extra electricity supply for load appliances.

4.4.1 Circuit Diagram

Fig 4.4 Circuit Diagram

In this project we’ve used employed the maglev wind turbine which is VAWT after this we

have arranged the coil placement for generation of the electrical power and for converting

into it in DC we have employed AC-DC conversion mechanism. We’ve chosen this project

because Maglev wind turbines have several advantages over conventional wind turbines. For

instance, they’re able to use winds with starting speeds as low as 1.5 meter per second (m/s).

Also, they could operate in winds exceeding 40 m/s. currently the largest conventional wind

turbines in the world produce only five megawatts of power. However, one large maglev

wind turbine could generate one GW of clean power, enough to supply energy to 750,000

homes.

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We have designed the Maglev Wind Mill in advanced manner. Maglev wind mill can spin in

light Breezes (1.5m/s) and its Cost/kWh is less compare to traditional wind mills. The

Maglev wind turbine design is a vast departure from conventional propeller designs. Its main

advantages are that it uses frictionless bearings and a magnetic levitation design and it does

not need to vast spaces required by more conventional wind turbines. It also requires little if

any maintenance. Magnetic levitation, maglev, or magnetic suspension is a method by which

an object is suspended with no support other than magnetic fields. Magnetic pressure is used

to counteract the effects of the gravitational and any other accelerations. The principal

advantage of a maglev windmill from a conventional one is, as the rotor is floating in the air

due to levitation, mechanical friction is totally eliminated.

4.5 Component Description

4.5.1 Neodymium Magnets

The Neodymium metal element is initially separated from refined Rare Earth oxides in an

electrolytic furnace. The "Rare Earth" elements are lanthanides (also called lanthanides) and

the term arises from the uncommon oxide minerals used to isolate the elements. Although the

term "Rare Earth" is used, it does not mean that the chemical elements are scarce. The Rare

Earth elements are abundant e.g. Neodymium element is more common than gold. The

Neodymium, Iron and Boron are measured out and put in a vacuum induction furnace to form

an alloy. Other elements are also added, as required for specific grades e.g. Cobalt, Copper,

Gadolinium and Dysprosium (e.g. to assist with corrosion resistance). The mixture is melted

due to the high frequency heating and melting the mixture. In simplified terms, the "Neo"

alloy is like a cake mixture with each factory having its own recipe for each grade. The

resultant melted alloy is then cooled to form ingots of alloy. The alloy ingots are then broken

down by hydrogen decrepitating (HD) or hydrogenation disproportionate desorption and

recombination (HDDR) and jet milled down in a nitrogen and argon atmosphere to a micron

sized powder (about 3 microns or less in size). The neodymium magnet is given a protective

coating. It is imperative that the drying is thorough otherwise water is locked into the plated

Neodymium magnet and the magnet will corrode from the inside out. The Rare Earth

elements are abundant e.g. Neodymium element is more common than gold. The

Neodymium, Iron and Boron are measured out and put in a vacuum induction furnace to form

an alloy. The Rare Earth elements are abundant e.g. Neodymium element is more common

than gold.

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Fig 4.5 Neodymium Magnet

4.5.1.1 Magnet Placement

Two ring type neodymium (NdFeB) magnets of grade N-35 of outer diameter 40 mm, inner

diameter 20 mm and thickness 10 mm are placed at the center of the shaft by which the

required levitation between the stator and the rotor is obtained. Similar Disc type magnets of

25 mm diameter are arranged as alternate poles one after the other, along the periphery of the

rotor made of plywood of 40mm diameter. These magnets are responsible for the useful flux

that is going to be utilized by the power generation system.

Fig 4.6 Magnet Placement

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4.5.2 Coils

An electromagnetic coil is an electrical conductor such as a wire in the shape of a coil, spiral

or helix. Electromagnetic coils are used in electrical engineering, in applications where

electric currents interact with magnetic fields, in devices such as inductors, electromagnets,

transformers, and sensor coils. Either an electric current is passed through the wire of the coil

to generate a magnetic field, or conversely an external time-varying magnetic field through

the interior of the coil generates an EMF (voltage) in the conductor. A current through any

conductor creates a circular magnetic field around the conductor due to Ampere's law. The

advantage of using the coil shape is that it increases the strength of magnetic field produced

by a given current. The magnetic fields generated by the separate turns of wire all pass

through the center of the coil and add (superpose) to produce a strong field there.[3] The more

turns of wire, the stronger the field produced. Conversely, a changing external magnetic flux

induces a voltage in a conductor such as a wire, due to Faraday's law of induction.[3][4] The

induced voltage can be increased by winding the wire into a coil, because the field lines

intersect the circuit multiple times. The direction of the magnetic field produced by a coil can

be determined by the right hand grip rule. If the fingers of the right hand are wrapped around

the magnetic core of a coil in the direction of conventional current through the wire, the

thumb will point in the direction the magnetic field lines pass through the coil. The end of a

magnetic core from which the field lines emerge is defined to be the North Pole.

Fig 4.7 Coil

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4.5.2.1 Coil Arrangement

43 gauge wires of 2500 turns each are used as coils for power generation. 24 sets of such

coils are used in the prototype. These coils are arranged in the periphery of the stator exactly

in a line to the arranged disc magnets. The coils are raised to a certain height for maximum

utilization of the magnetic flux. Each set of such coils are connected in series to obtain

maximum output voltage. The series connection of the coils is preferred over the parallel

connection for optimizing a level between the output current and voltage. This is not the only

point on which an obvious analogy exists between windmills and sailing-vessels, both being

wind-driven mechanisms. Without sails a mill is a mill no more; sails are essential to it. Due

to the presence of these harmonics, the total harmonic distortion is high and the input power

factor is poor. Due to problems associated with low power factor and harmonics, utilities will

enforce harmonic standards and guidelines which will limit the amount of current distortion

allowed into the utility and thus the simple diode rectifiers may not in use.

Fig 4.8 Coil Arrangement

4.5.3 Wind Sail

The principal components of a windmill are of course the SAILS. Indeed, it is the sails which

transmit the wind power to all those parts which together form the windmill. Without sails a

mill is a mill no more; sails are essential to it. It is obvious that the shape and the construction

of the sails are of primary importance, for they determine the proportion of the energy which

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Can be transmitted from the wind to the mill. It is the same thing as with a sailing-vessel,

where the shape, position, and size of the sail determine in the first place the propulsion and

the speed of the vessel. This is not the only point on which an obvious analogy exists between

windmills and sailing-vessels, both being wind-driven mechanisms. Without sails a mill is a

mill no more; sails are essential to it. It is obvious that the shape and the construction of the

sails are of primary importance, for they determine the proportion of the energy which can be

transmitted from the wind to the mill.

Just as the sail is spread out as a wing-shaped surface behind the mast on a vessel, so behind

the stock of a windmill sail there is a surface slightly inclined to the common plane,

consisting in this case of a sail-cloth covering the frame. This frame is a system of bars

mortised into the stock and connected together with laths or up longs. The bars in the

transverse direction project slightly through the stock and are connected in the longitudinal

direction by the up longs. Attached to the stock are the leading boards, a set of boards which

may be compared to some extent to a foresail before the mast. The wind, blowing on the

sails, gives a sideways force component which makes the sails turn.

Fig 4.9 Wind Sail

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4.5.4 AC–DC conversion module

An ac to dc converter is an integral part of any power supply unit used in the all electronic

equipment. Also, it is used as an interface between utility and most of the power electronic

equipments. These electronic equipments form a major part of load on the utility. Generally,

to convert line frequency ac to dc, a line frequency diode bridge rectifier is used. To reduce

the ripple in the dc output voltage, a large filter capacitor is used at the rectifier output. But

due to this large capacitor, the current drawn by this converter is peaky in nature. This input

current is rich in low order harmonics.

Also, as power electronics equipments are increasingly being used in power conversion, they

inject low order harmonics into the utility. Due to the presence of these harmonics, the total

harmonic distortion is high and the input power factor is poor. Due to problems associated

with low power factor and harmonics, utilities will enforce harmonic standards and

guidelines which will limit the amount of current distortion allowed into the utility and thus

the simple diode rectifiers may not in use. So, there is a need to achieve rectification at close

to unity power factor and low input current distortion. Initially, power factor correction

schemes have been implemented mainly for heavy industrial loads like induction motors,

induction heating furnaces etc., which forms a major part of lagging power factor load.

However, the trend is changing as electronic equipments are increasingly being used in

everyday life nowadays. Hence, PFC is becoming an important aspect even for low power

application electronic equipments.

Fig 4.10 AC–DC conversion module

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4.6 Snap Shots:

Fig 4.11 Coil Placement

Fig 4.12 Magnet Placement

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Fig 4.13 Actual View of the Maglev Windmill after Completion of project.

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Fig 4.14 Front View of the maglev Windmill

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Chapter-5

RESULT ANALYSIS

Step-1: - Results of various electrical quantities at RPM=50

POWER (In watt) VOLTAGE (in volt) CURRENT (in amp)

0.40 35.5 0.011

Step-2: - Results of various electrical quantities at RPM=80

POWER (In watt) VOLTAGE (in volt) CURRENT (in amp)

0.80 52.6 0.015

Step-3: - Results of various electrical quantities at RPM=100

POWER (In watt) VOLTAGE (in volt) CURRENT (in amp)

2.0 105.8 0.018

Step-4: - Results of various electrical quantities at RPM=150

POWER (In watt) VOLTAGE (in volt) CURRENT (in amp)

3.5 145.9 0.024

Step-5: - Results of various electrical quantities at RPM=200

POWER (In watt) VOLTAGE (in volt) CURRENT (in amp)

4.5 198.3 0.022

Page 32: Maglev windmill project report

Chapter-6

CONCLUSION AND FUTURE SCOPE

6.1 Conclusion

Over all, the magnetically levitated vertical axis wind turbine was a success. The rotors that

were designed harnessed enough air to rotate the stator at low and high wind speeds while

keeping the center of mass closer to the base yielding stability. The wind turbine rotors and

stator levitated properly using permanent magnets which allowed for a smooth rotation with

negligible friction. The Vertical Axis Wind Turbine (VAWT) with magnetic levitation

performed better than the conventional wind turbine. Tests results VAWT model has lower

starting wind speed compare to conventional one. The rotational speed of maglev VAWT is

higher. The time taken for the maglev wind turbine to stop rotating is longer than that of

conventional. Therefore, the Maglev wind turbine is more suitable for power generation

application. The home for the magnetically levitated vertical axis wind turbine would be in

residential areas. Here it can be mounted to a roof and be very efficient and able to extract

free clean energy thus experiencing a reduction in their utility cost and also contribute to the

“Green Energy” awareness that is increasingly gaining popularity.

6.2 Future Scope

� The technology is expected to create new opportunities in low-speed areas, with

starting speed as low as 1.5m/s & cut in speed of 3m/s.

� It is configured to capture wind from any direction and convert wind to energy at very

high efficiency.

� Magnetic levitation reduces the friction & eliminates need of bearings.

� Today wind turbines are considered to be the most developed form of renewable

energy technology.

� Able to deliver clean green-power for less than one cent per kilowatt hour.

� This new technology is remarkably cheap with low operating cost. Less noise

compared to existing conventional wind turbines.

Page 33: Maglev windmill project report

REFERENCES

[1] Vishal D Dhareppagol, Maheshwari M Konagutti “ Regenedyne Maglev Wind Power

Generation”.

[2] Minu John, Rohit John, Syamily P.S, Vyshak P.A“Maglev Windmill” International Journal of Innovative Research in Advanced Engineering Volume 1, Issue 7, August 2014. [3] Dinesh N Nagarkar, Dr. Z. J. Khan “ Wind Power Plant Using Magnetic Levitation Wind Turbine” International Journal of Emerging Technology and Advanced Engineering Volume 5, Issue 2, February 2015. [4] Richard D. Thornton, Fellow IEEE” Efficient and Affordable Maglev Opportunities in the United States” [5] Pankaj R Amratan Ingle “report on maglev vawt” IBSS College of Engineering, University-Mardi Road, Dist. Amravati. [6] Nianxian Wang*, Yefa Hu, Huachun Wu, Jinguang Zhang, and Chunsheng Song “Research on Forces and Dynamics of Maglev Wind Turbine Generator”