Patent ID: 6020696
Filing Date: 2000-02-01
Classification: B60L,Y02T

Abstract:
A control device for controlling a synchronous electric motor of an electric vehicle, comprising:a battery;an inverter main circuit having a DC link capacitor for driving said motor with a power of said battery;an inverter relay for feeding a DC power of said battery to said inverter main circuit;a resistor;an auxiliary relay for feeding a DC power of said battery to said inverter main circuit through said resistor;a speed sensor for sensing a rotation speed of said motor;a main key switch for electrically connecting said battery to said inverter main circuit through said inverter and auxiliary relays when assuming ON position, and causing said motor to serve as a generator to charge said DC link capacitor when assuming OFF position; anda control unit for controlling said inverter relay, said auxiliary relay and said inverter main circuit,wherein when, upon turning of said main key switch to ON position, said speed sensor senses that the rotation speed of said motor is within a predetermined range, said control unit turns said auxiliary relay ON, then turns said inverter relay ON after shorting armature coils of said motor with the aid of said inverter main circuit, and then stops the shorting of the armature coils with the aid of said inverter main circuit.