Patent ID: 6836085
Filing Date: 2004-12-28
Classification: A61G,B60L,Y02T

Abstract:
A method of controlling an electric vehicle which is so constituted as to drive a synchronous motor by way of a switch and an inverter circuit, a battery acting as a source of driving a controlling power, the synchronous motor having a permanent magnet acting as an outer rotor, the method comprising the following operations of:1) detecting that the electric vehicle has an acceleration signal of zero; 2) detecting that an actual speed of the electric vehicle is less than a predetermined percent of a rated speed; 3) supplying a current to a winding of a fixed phase of the synchronous motor, by way of the inverter circuit; and 4) generating a braking force, wherein a capacitor is disposed between a first power source terminal and a second power source terminal of a position detector for detecting a rotary position of the permanent magnet of the synchronous motor, a relay which is energized when the switch is open is disposed in parallel with the capacitor, and the controlling power is supplied from the battery to a controller of the inverter circuit by way of a contact of the relay.