Inductive charging - Mortar Pump EZJ manufacturer - Sump Pump EVM manufacturer

Advantages Inductive charging carries a far lower risk of electrical shock, when compared with conductive charging, because there are no exposed conductors. The ability to fully enclose the charging connection also makes the approach attractive where water impermeability is required; for instance, inductive charging is used for implanted medical devices that require periodic or even constant external power, and for electric hygiene devices, such as toothbrushes and shavers, that are frequently used near or even in water. Inductive charging makes charging mobile devices more convenient; rather than having to connect a power cable, the device can be placed on a charge plate. Disadvantages One disadvantage of inductive charging is its lower efficiency and increased ohmic (resistive) heating in comparison to direct contact. Implementations using lower frequencies or older drive technologies charge more slowly and generate heat for most portable electronics,[citation needed]; the technology is nonetheless commonly used in some electric toothbrushes and wet/dry electric shavers, partly for the advantage that the battery contacts can be completely sealed to prevent exposure to water. Inductive charging also requires drive electronics and coils that increase manufacturing complexity and cost. Newer approaches diminish the transfer losses with ultra thin coils, higher frequencies and optimized drive electronics, thus providing chargers and receivers that are compact, efficient[citation needed] and can be integrated into mobile devices or batteries with minimal change. These technologies provide charging time that are the same as wired approaches and are finding their way into mobile devices rapidly.

The Magne Charge system used in the GM EV-1, Chevy S-10 EV and Toyota RAV4 EV vehicles employed high-frequency induction to deliver high power at an efficiency of 86% (6.6kW power delivery from a 7.68kW power draw). Examples Transcutaneous energy transfer (TET) systems in artificial hearts and other surgically implanted devices. General Motors' (GM) discontinued EV-1 electric car was charged with an inductive charging paddle, which was inserted into a receptacle on the vehicle. GM and Toyota agreed on a standard inductive charging interface developed by Hughes Electronics for GM called Magne Charge. GM later dropped its support in 2002 when the California Air Resources Board selected the SAE J1772, or "Avcon", conductive charging interface for electric vehicles in California. In 2006, researchers at the Massachusetts Institute of Technology reported that they had discovered an efficient way to transfer power between coils separated by a few meters. The team, led by Marin Soljai, theorized that they could extend the distance between the coils by adding resonance to the equation. The MIT wireless power project, called WiTricity, uses a curved coil and capacitive plates. April 28, 2009: An Energizer inductive charging station for the Wii remote is reported on IGN. At CES in January 2009, Palm, Inc. announced their new Pre smartphone would be available with an inductive charger, though the charger itself will be sold as a separate accessory. The charger is known as the "Touchstone", and a special backplate must be fitted to the Pre in order to be compatible with it. In August 2009 A Consortium of interested companies called the Wireless Power Consortium announced they were nearing completion for a new industry standard for low-power Inductive charging

See also Charging station In-road electric vehicle charger Resonant energy transfer Environmental technology References ^ a b "How can an electric toothbrush recharge its batteries when there are no metal contacts between the toothbrush and the base?" (Commercial website). HowStuffWorks, Inc., via howstuffworks.com. Retrieved on 2007-08-23. ^ a b US patent 6972543 "Series resonant inductive charging circuit" ^ a b c David Pogue (2009-06-03). "Another Pre Innovation: The Touchstone Charging Stand". NYTimes.com. http://pogue.blogs.nytimes.com/2009/06/03/another-pre-innovation-the-touchstone-charging-stand/?ref=personaltech. Retrieved 2009-10-15. ^ "Non-contact Charging System Simultaneously Charges Multiple Mobile Devices" ^ WM7200 Inductive Charger Owner Manual. GM Advanced Technology Vehicles, Torrance, California 90509-2923, 1-800-482-6644. 1998. p. 15. http://www.evchargernews.com/miscfiles/gm atv wm7200 owners manual.pdf. Retrieved 2009-10-15. ^ "GM Pulls the Plug on Inductive Charging: Letter from General Motors Advanced Technology Vehicles". EV1 Club. 2002-03-15. http://ev1-club.power.net/archive/020315/index.htm. Retrieved 2007-08-23. ^ Hadley, Franklin (2007-06-07). "Goodbye wires". MIT News. Massachusetts Institute of Technology. http://web.mit.edu/newsoffice/2007/wireless-0607.html. Retrieved 2007-08-23. MIT team experimentally demonstrates wireless power transfer, potentially useful for powering laptops, cell phones without cords. ^ Castelvecchi, Davide (2006-11-15). "Wireless energy may power electronics: Dead cell phone inspired research innovation" (pdf). TechTalk (Massachusetts Institute of Technology) 51 (9). http://web.mit.edu/newsoffice/2006/techtalk51-9.pdf. Retrieved 2007-08-23. ^ "Energizer Induction Charger for Wii Preview". IGN.com. 2009-04-28. http://gear.ign.com/articles/977/977418p1.html. ^ Miller, Paul (2009-01-08). "Palm Pre's wireless charger, the Touchstone". Engadget. http://www.engadget.com/2009/01/08/palm-pres-wireless-charger. ^ "wireless electricity specification nearing completion". PCWorld. 2009-08-18. http://www.pcworld.com/article/170360/wireless_electricity_specification_nearing_completion.html?

loomia_ow=t0:s0:a41:g2:r18:c0.016236:b27254916:z0. Retrieved 2009-08-21. External links How Inductors Work How Electric Toothbrushes Recharge Using Inductors Inductive Charging Wireless Electricity Is Here Categories: Electronics terms | Inductive chargingHidden categories: NPOV disputes from October 2009 | All NPOV disputes | All articles with unsourced statements | Articles with unsourced statements from August 2007

Wireless energy could power consumer, industrial electronics

Researchers present a graphic illustrating how magnetism can transmit energy wirelessly. Marin Soljacic, left, assistant professor of physics, Aristeidis Karalis, G, and John Joannopoulos, professor of physics, use theoretical calculations and computer simulations to find ways to recharge electronics wirelessly. Photo / Donna CoveneyRecharging your laptop computer -- and also your cell phone and a variety of other gadgets -- might one day be doable in the same convenient way many people now surf the Web: wirelessly.

Solar Energy - Learn about saving energy from the experts. Enterprise wide savings! - schneider-electric.comMarin Soljacic of the Massachusetts Institute of Technology will present research by himself and his colleagues Aristeidis Karalis and John Joannopoulos on the physics of electromagnetic fields, showing how wireless energy could power future gadgets. The MIT team is also working on demonstrating the technology in practice. The work will be described on Tuesday, November 14 in San Francisco, at the 2006 American Institute of Physics Industrial Physics Forum (IPF), which will be co-located with the Nanotechnology Topical Conference at the AVS 53rd International Symposium & Exhibition at the Moscone Center West.Like many of us, Soljacic (pronounced Soul-ya-cheech) keeps forgetting to recharge his cell phone, and when the thing is about to die it starts to complain with an unpleasant noise. "Needless to say, this always happens in the middle of the night," he said. "So, one night, at 3 a.m., it occurred to me: Wouldn't it be great if this thing charged itself?" The experience got the MIT scientist thinking hard to see if any of the physics principles he knew of could turn into new ways of transmitting energy.After all, scientists and engineers have known for nearly two centuries that transferring electric power does not require wires to be in physical contact all the way. Electric motors and power transformers contain coils that transmit energy to each other by the phenomenon of electromagnetic induction. A current running in an emitting coil induces another current in a receiving coil; the two coils are in close proximity, but they do not touch.Later, scientists discovered electromagnetic radiation in the form of radio waves, and they showed that another form of it -- light -- is how we get energy from the sun. But turning light

into electrical power is notoriously difficult, and requires a direct line-of-sight between transmitter and receiver. Radio waves, and especially microwaves, can be used to transfer energy, which can then be picked up with an antenna. But transferring energy from one point to another through ordinary electromagnetic radiation is typically very inefficient, and can even be dangerous: The waves tend to spread in all direction, so most of the energy is lost to the environment. 

Siemens answers: - Efficient energy supply Long-distance power transmission. - www.siemens.com/answersHowever, Soljacic realized that the close-range induction taking place inside a transformer -- or something similar to it -- could potentially transfer energy over longer distances, say, from one end of a room to the other. Instead of irradiating the environment with electromagnetic waves, a power transmitter would fill the space around it with a "non-radiative" electromagnetic field. Energy would only be picked up by gadgets specially designed to "resonate" with the field. Most of the energy not picked up by a receiver would be reabsorbed by the emitter.In his talk at the IPF's "Frontiers in Physics" session, Soljacic will explain the physics of non-radiative energy transfer and the possible design of wireless-power systems.While rooted in well-known laws of physics, non-radiative energy transfer is a novel application no one seems to have pursued before. And figuring the details was not easy, Soljacic said, something he and his colleagues did through theoretical calculations and computer simulations. "It certainly was not clear or obvious to us in the beginning how well it could actually work, given the constraints of available materials, extraneous environmental objects, and so on. It was even less clear to us which designs would work best."With the proposed designs, non-radiative wireless power would have limited range, and the range would be shorter for smaller-size receivers. But the team calculates that an object the size of a laptop could be recharged within a few meters of the power source. Placing one source in each room could provide coverage throughout your home.Soljacic is looking forward to a future when laptops and cell phones might never need any wires at all. Wireless, he said, could also power other household gadgets that are now becoming more common. "At home, I have one of those robotic vacuum cleaners that clean your floors automatically," he said, "it does a fantastic job but, after it cleans one or two rooms, the battery dies." In addition to consumer electronics, wireless energy could find industrial applications, for example powering freely-roaming robots within a factory pavilion.Source: American Institute of Physics

Delphi unveils wireless EV charger

Delphi Automotive has equipped an electric vehicle with its Delphi Wireless Charging System, an efficient wireless energy transfer system featuring technology developed by WiTricity Corp. Delphi will display the test vehicle at this year’s SAE World Congress here this week.A wireless charging system eliminates the need for a charging cord. Drivers can simply park their electric vehicle over a wireless energy source situated on the garage floor or embedded in a paved parking spot.“The Delphi Wireless Charging System offers more practical and flexible installation than traditional inductive systems because it uses highly resonant magnetic coupling, a modern technology that safely and efficiently transfers power over significantly larger distances and can adapt to natural misalignment often associated with vehicle positioning during parking,” said Randy Sumner, director, global hybrid vehicle development, Delphi Packard Electrical/Electronic Architecture.

Delphi Showcases Innovative Wireless EV ChargingRevolutionary Technology to Offer Most Efficient and Convenient Wireless Charging Option

to Future Electric Vehicle Drivers, Flexible Installation to EV Infrastructure

DETROIT, MI--(Marketwire - Apr 13, 2011) - Delphi Automotive has equipped an electric vehicle with its

Delphi Wireless Charging System, a highly efficient wireless energy transfer system featuring

technology developed by WiTricity Corporation. Delphi will display the test vehicle at this year's SAE

World Congress here this week.

"This is a significant advancement in our research and development efforts to offer automotive

manufacturers a practical wireless charging solution we believe is superior to others being proposed,"

said Randy Sumner, director, global hybrid vehicle development, Delphi Packard Electrical/Electronic

Architecture. According to Sumner, engineers at Delphi's Customer Technical Center in Champion,

Ohio, have installed the Delphi Wireless Charging System on an all-electric THINK City test vehicle, and

have confirmed that system performance meets automotive market requirements.

A wireless charging system eliminates the need for a charging cord. Drivers can simply park their

electric vehicle over a wireless energy source situated on the garage floor or embedded in a paved

parking spot. Other wireless charging systems under development make use of traditional inductive

charging, the same technology used in electric toothbrushes, which is based on principles first

proposed in the mid-nineteenth century. These systems only work over a limited distance range,

require precise accurate parking alignment and can be very large and heavy, making them impractical

for widespread use on electric vehicles.

"The Delphi Wireless Charging System offers more practical and flexible installation than traditional

inductive systems because it uses highly resonant magnetic coupling, a modern technology that safely

and efficiently transfers power over significantly larger distances and can adapt to natural

misalignment often associated with vehicle positioning during parking," Sumner said. This means that

Delphi charging sources can be buried in pavement, are unaffected by environmental factors such as

snow, ice or rain, can accommodate a wide range of vehicle shapes and sizes and their differing

ground clearances. The Delphi system is also more forgiving to vehicle parking positions on top of the

charger without requiring any moving parts to accommodate. The system transfers energy using an

oscillating magnetic field, which is intrinsically safe for humans and animals.

According to Sumner, the system will automatically transfer power to the electric vehicle's battery

pack at a rate of 3,300 watts -- the same rate as most residential plug-in chargers -- and is able to do

so with the smallest and lightest modules possible. These components are important to minimizing

overall vehicle weight and cost while maximizing the driving range of EVs, a critical selling point for

automakers.

"We are excited by our testing and validation of the system and believe we have a valuable and

unique wireless charging solution that offers the most potential for widespread use in the automotive

market. With the support of automotive manufacturers, this technology can be integrated into the next

generation of electric vehicles," Sumner said.

Wireless charging technology will need to co-exist with plug-in charging solutions, he added, so that

electric vehicle drivers have the ability to charge their vehicle when they are away from their wireless

charging source.

Delphi also makes a Portable Electric Vehicle Charger that fits conveniently in the trunk of an electric

vehicle. The user-friendly, UL-listed charging system plugs into any standard 120-volt outlet to enable

safe electric vehicle battery charging at home or away. The charging unit can also be integrated into

stationary charging applications.

About Delphi

Delphi is a leading global supplier of electronics and technologies for automotive, commercial vehicle

and other market segments. Operating major technical centers, manufacturing sites and customer

support facilities in 30 countries, Delphi delivers real-world innovations that make products smarter

and safer as well as more powerful and efficient. Connect to innovation at www.delphi.com

About WiTricity Corp.

WiTricity Corporation designs, develops, manufactures, and markets patented technology for wireless

energy transfer. Founded in 2007, the company is commercializing technology invented by a team of

renowned MIT physicists. This technology utilizes magnetism to transfer energy without wires in a way

that is safe, efficient, and that works over distance. WiTricity is developing wireless energy transfer

solutions for a broad range of consumer electronics, electric vehicle, medical, industrial, and military

applications. For more information, visit www.witricity.com

Sony develops highly efficient wireless power transfer system based on magnetic resonance

Sony Corp. today announced the development of a highly efficient wireless power transfer system that eliminates the use of power cables from electronic products such as television

sets. Using this system, up to 60 Watts of electrical energy can be transferred over a distance of 50cm (at an efficiency of approximately 80%, approximately 60% including rectifier).

This new wireless power transfer system incorporates a form of contactless electrical energy transmission technology based on magnetic resonance. With magnetic resonance, electromagnetic energy is only transferred to recipient devices that share the identical resonant frequencies as the energy source, soenergy transfer efficiency is maintained, even when misalignment occurs. Furthermore, even if there are metal objects located between the transmitter and receiver, no heat induction occurs.Sony has also drawn on its years of experience developing high radio frequency(RF) technologies for use in wireless communications and broadcast products to create a new rectifier that realizes both high speed and high efficiency. The new wireless power transfer system combines these technologies to realize a transfer efficiency of 60%, even when a rectifier is included. Sony has also developed passive extender units that are set to the same frequencies as the transmission and recipient devices, enabling the transfer distance to be extended from 50cm to 80cm (based on fundamental experiments conducted using components only) without any degradation in transfer efficiency.

With the growth in networked products, the number of cables used to connect these products has also increased. While data cables are rapidly being replaced with wireless communication systems such as Wi-Fi, the demand for wireless power transfer systems is also continuing to grow. Sony will proceed with its efforts to develop further technologies that meet customer needs for the wireless transfer of power across a wide range of products, distances and energy levels.

Main Features1. High speed rectifier realizing high transfer efficiency Sony has drawn on its years of experience and expertise in RF technologies, and also incorporated optimal new components to develop a new rectifier that combines both high speeds and high efficiency. This minimizes energy loss when transferring energy from the transmitter to the receiver, and enables products such as television sets and mobile PCs to be efficiently powered, wirelessly. 

2. Transfer distance is able to be extended using passive extender units Passive extender units placed between the transmitter and receiver units enable the transfer distance to be extended without any degradation in efficiency. Based on fundamental experiments conducted using the component devices only, transfer distance can be extended from 50cm to 80cm. Although relatively large transmitter and receiver units are generally required for transferring energy over long distances, passive extender units can be used to relay power between small-sized transmitter and receiver units.Source: Sony