Power Transfer for a Moving Vehicle

3/16

Problems of previous study

Gap：
Non

Gap：
30 cm

Efficiency：

ca. 100％

Efficiency：ca. 50％

60 cm

Leakage of

electric field

Simulation results （Electric distribution）

Frequency：

10 MHz

Misregistation of

coil

Leakage of electromagnetic field

Misregistration

High speed

movement

High efficiency

transfer

Safety

Problem：
　　　Unnecessary radiation control　　　
Misalignment
　　　High efficiency transfer

Power transfer technology

that used resonance coil


	The efficiency of wireless electric power transmission is generally low; however, a new method has been proposed by a research group at MIT.

	The new method has achieved a high transmission efficiency of 90% or more. As a result, a number of research groups are currently examining wireless power transfer technology.
	Although the resonance method can provide highly effective transmission compared with previous methods, the efficiency can deteriorate sharply if the position of the transmission coil shifts.
	Therefore, it is difficult to effectively transmit electric power to a running vehicle using this method.
	Moreover, individuals and telecommunications equipment in the immediate vicinity of a running car are adversely affected by the energy transmission.