Title :
Large air-gap coupler for inductive charger [for electric vehicles]
Author :
Sakamoto, H. ; Harada, K. ; Washimiya, S. ; Takehara, K. ; Matsuo, Y. ; Nakao, F.
Author_Institution :
Kumamoto Inst. of Technol., Japan
fDate :
9/1/1999 12:00:00 AM
Abstract :
A novel magnetic coupler with large air gap is presented. It is developed for the electric vehicle´s automatic inductive charger. The new inductive coupler proposed has sufficient exciting inductance even if it has a large air gap. The calculated exciting inductance is 40 μH at 2 turns of winding and 5 mm air gap, which agrees well with the measured value. In order to assess the generation of heat caused by the eddy current, the magnetic flux densities in the inductive charger and also a flat iron plate, to which the inductive charger is attached, are calculated. The conversion efficiency with the coupler and a MOSFET full-bridge inverter of 100 kHz is 97% at 8.3 kW output
Keywords :
air gaps; battery chargers; coils; electric vehicles; ferrite devices; inductance; magnetic cores; magnetic leakage; 100 kHz; 8.3 kW; 97 percent; MOSFET full-bridge inverter; automatic charger; conversion efficiency; eddy current; electric vehicle; exciting inductance; heat generation; inductive charger; large air-gap coupler; large ferrite pot cores; leakage inductance; magnetic coupler; magnetic flux densities; self-inductance; windings; Air gaps; Couplings; Eddy currents; Electric vehicles; Inductance measurement; Inverters; Iron; MOSFET circuits; Magnetic flux; Magnetic flux density;
Journal_Title :
Magnetics, IEEE Transactions on
