A power supply device for an electric vehicle

摘要

A power supply device for an electric vehicle comprising: a generator-motor (11 comprising a brushless alternating current machine; an engine (2) for driving to rotate the generator-motor; a speed increasing and decreasing transmission means (12) which connects the engine with the generator-motor; an alternating current driving motor (13) for running a vehicle; a storage battery (4) as a power supply source for a direct current load and for a starting motor in starting the engine; and a power converting circuit (14); wherein, in starting the engine, the storage battery (4) supplies an alternating current voltage to the generator-motor (11) through the speed increasing and decreasing transmission means (12) and rotates the generator-motor (11) as a motor and the speed increasing and decreasing transmission means (12) decreases a first speed of the generator-motor, thereby starting to rotate the engine; and in generating power, the speed increasing and decreasing transmission means (12) increases a second speed of a driving revolution of the engine and rotates the generator-motor (11) as an alternating current generator which supplies a generated alternating power to the alternating current driving motor (13) through the power converting circuit (14) thereby driving to rotate the alternating current driving motor and running the vehicle, and a direct current converted by the power converting circuit (14) charges the storage battery (4).