Power feed system for feeding power to the motor of an electric motorcar.

摘要

[OBJECT] The present invention provides power feed system for feeding power to an electric motor car, having a motor driving circuit provided with a smoothing capacitor, capable of preventing the smoothing capacitor from being discharged, and having a comparatively short main current supply line to reduce unnecessary power loss. [CONSTRUCTION] The power feed system has a motor driving circuit 20 for converting dc supply power into ac supply power to feed the ac supply power to a motor 20, provided with a smoothing capacitor 34 and a plurality of semiconductor switching devices Q1 to Q6, and built in the motor 20. An electromagnetic relay 32 is placed within a case 31 containing the motor driving circuit 30, and the electromagnetic relay 32 is controlled to supply a main current to and to interrupt the supply of the main current to the motor driving circuit 30.