Patent ID: 6590360
Filing Date: 2003-07-08
Classification: B60K,B60W,F02N,H02P,Y02T

Abstract:
A control device for controlling a permanent magnet motor serving as both a starter for an engine and a generator in a motor vehicle, the engine including an output shaft to which the permanent magnet motor is connected, the motor vehicle including a battery, the control device comprising:a drive circuit converting a direct current to an alternating current to supply the alternating current to the permanent magnet motor, the drive circuit having at least one arm including two series connected first switching elements having flywheel diodes respectively, the drive circuit having an input terminal connected to a capacitor and an output terminal connected to the permanent magnet motor; a chopper circuit including a plurality of series connected second switching elements having diodes connected in parallel with the second switching elements respectively, the chopper circuit being disposed at the battery side and connected in parallel with the capacitor; a reactor connected between a neutral point of the chopper circuit and the battery; and control means for controlling the switching elements of the drive circuit and chopper circuit so that the switching elements are turned on and off.