Written Pole Technology
Transcript of Written Pole Technology
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WRITTEN-POLE ELECTRIC MOTORS
Presented by:Nidhi Pansari (3rd elec)Preeti Baid (3rd elec)
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2
CONTENTS
•LIMITATIONS OF CONVENTIONAL TECHNOLOGY•CONSTRUCTION•WRITTEN-POLE TECHNOLOGY•OPERATION•OPERATIONAL BENEFITS•ADVANTAGES•WEATHER CONDITIONS•APPLICATIONS•CONCLUSION
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LIMITATIONS OF CONVENTIONAL TECHNOLOGY
1.Dependence of speed on no. of poles of rotor.
speed = 120 X frequency no. of poles2.The machine must have even no. of
poles and deviating from this condition will cause unstability at its rated speed.
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AN INNOVATIVE PATENTED
TECHNOLOGY• In the 1990’s, with support
from the EPRI, the Precise Power Corporation of Bradenton, Florida, developed a new concept in electric motors called the Written Pole® electric motor.
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WRITTEN-POLE TECHNOLOGY
• The patented Written-Pole® Technology allows the magnetic pole pattern on the magnet layer to be changed to a desired pattern while the machine is rotating and therefore breaks the relationship between rotor speed and output frequency.
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Contd..
CONSTRUCTION
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Contd…
• Written Pole motors use similar construction techniques found in conventional motors.
• A continuous layer of ferrite magnets on the surface of the rotor, along with a high-density exciter winding contained within the stator winding .
• The basic platform consists of a conventional steel shaft inserted into a lamination stack containing a high resistance rotor cage.
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• The high resistance cage is a key factor in limiting the starting current of Written-Pole motors.
• The stator lamination stack is constructed using low loss electrical steel laminations.
• The concentrated excitation windings are contained within the stator structure and are located between the main stator windings.
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OPERATION
• A written-pole motor employs one of three modes of operation based on the rotational speed of the machine:
1. START MODE 2. WRITTEN POLE MODE 3. RUN MODE.
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OPERATIONAL BENEFITS
Feature Conventional
WP
Speed 3,560rpm 3600 rpm
Efficiency 85% 93%
Power factor 90.5% 100%
Full-load power 53kW 40kW
Full-load torque 73.7 ft-lb 73 ft-lb
Starting torque 88 ft-lb 82 ft-lb
Full-load current 219 amps 173 amps
Locked rotor current
1450 amps 312amps
Cost (p.u.) 1.0 1.2
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ADVANTAGES
1. Low starting current requirements
2. Energy efficient operation3. Unity power factor operation4. Simple construction5. Low temperature rise6. High inertia starting7. Instantaneous restart capability8. Ride through characteristics9. Three-phase applications
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WEATHER CONDITIONS
• The Written-Pole motor is designed to operate in ambient temperatures ranging from 32ºF to 104ºF.
• However,test results show that Written-Pole motors have reliably operated in temperatures ranging from 42ºF to 122ºF.
• They may be operated safely in the open air if there is adequate protection from direct rain.The motor base must be mounted on a raised concrete pad or steel frame to avoid exposure to standing water.
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A WRITTEN POLE RIDE THROUGH MOTOR USED IN A
FARM
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APPLICATIONS
• Regulation of output voltage and frequency in electric generators,without relying on external regulators or power electronics.
• In a family of single and three-phase motive power and power protection systems used by many customers including the US Weather Service,NASA,Federal Aviation Authority,US Air Force and many commercial and industrial customers.
• To create a simple,rugged power protection unit combining Written-Pole motors and generators with an integral flywheel
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AWARD WINNING TECHNOLOGY
• A recipient of the R&D 100 Award in 1994, Written-Pole technology was recognized by R&D Magazine as one of that year's most technologically significant innovations.
• The technology has also been recognized by numerous technical organizations including the Professional Society of Engineers in the United States.
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CONCLUSION
• The written-pole motor, developed by Precise Power Corporation, is a motor design that allows for the operation of very large single-phase motors.
• This unique product has applications virtually anywhere that three-phase power is either not available, or is not economical to provide.
• This motor technology has the additional benefit of being able to ride through brief service interruptions on single-phase power lines.
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WRITTEN POLE TECHNOLOGY
THANK
YOU!