21 year of ser­vice to the community


The Cur­rent Year is 6264

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Researchers from North Car­olina State Uni­ver­sity have devel­oped new tech­nol­ogy and tech­niques for trans­mit­ting power wire­lessly from a sta­tion­ary source to a mobile receiver — mov­ing engi­neers closer to their goal of cre­at­ing high­way “sta­tions” that can recharge elec­tric vehi­cles wire­lessly as the vehi­cles drive by.

We’ve made changes to both the receiver and the trans­mit­ter in order to make wire­less energy trans­fer safer and more effi­cient,” says Dr. Srd­jan Lukic, an assis­tant pro­fes­sor of elec­tri­cal engi­neer­ing at NC State and senior author of a paper on the research.

The researchers devel­oped a series of seg­mented trans­mit­ter coils, each of which broad­casts a low-​level elec­tro­mag­netic field. The researchers also cre­ated a receiver coil that is the same size as each of the trans­mit­ter coils, and which can be placed in a car or other mobile plat­form. The size of the coils is impor­tant, because coils of the same size trans­fer energy more effi­ciently. The researchers mod­i­fied the receiver so that when it comes into range and cou­ples with a trans­mit­ter coil, that spe­cific trans­mit­ter coil auto­mat­i­cally increases its cur­rent — boost­ing its mag­netic field strength and the related trans­fer of energy by 400 per­cent. The trans­mit­ter coil’s cur­rent returns to nor­mal lev­els when the receiver passes out of the range of the trans­mit­ter. These mod­i­fi­ca­tions improve on pre­vi­ous mobile, wire­less power trans­fer techniques.

One pre­vi­ous approach was to use large trans­mit­ter coils. But this approach cre­ated a pow­er­ful and impre­cise field that could cou­ple to the frame of a car or other metal objects pass­ing through the field. Because of the mag­netic field’s strength, which is required to trans­fer suf­fi­cient power to the receiver, these elec­tro­mag­netic field “leaks” raised safety con­cerns and reduced sys­tem effi­ciency. Another pre­vi­ous approach used smaller trans­mit­ter coils, which addressed safety and effi­ciency con­cerns. But this approach would require a very large num­ber of trans­mit­ters to effec­tively “cover” a sec­tion of the road­way, adding sub­stan­tial cost and com­plex­ity to the sys­tem, and requir­ing very pre­cise vehi­cle posi­tion detec­tion technology.

A small pro­to­type serves as a proof of con­cept for the system.
Credit: Image cour­tesy of North Car­olina State University

We tried to take the best from both of those approaches,” Lukic says.

Lukic and his team have devel­oped a small, func­tional pro­to­type of their sys­tem, and are now work­ing to both scale it up and increase the power of the system.

Cur­rently, at peak effi­ciency, the new sys­tem can trans­mit energy at a rate of 0.5 kilo­watts (kW). “Our goal is to move from 0.5 kW into the 50 kW range,” Lukic says. “That would make it more practical.”

Look­ing a bit deeper into this I found this inter­est­ing bit of news


The Online Elec­tric Vehi­cle (OLEV), devel­oped by the Korea Advanced Institute
of Sci­ence and Tech­nol­ogy (KAIST), is an elec­tric vehi­cle that can be charged
while sta­tion­ary or dri­ving, thus remov­ing the need to stop at a charg­ing station.
Credit: Image cour­tesy of ResearchSEA

Read more :The Online Elec­tric Vehicle

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