Patent ID: 7635963
Filing Date: 2009-12-22
Classification: H02K,H02P

Abstract:
1. A dual motor drive system comprising: a first motor having N groups of M phase coils, the coils having M×N drive points; a second motor having M groups of N phase coils, the coils having N×M drive points; an inverter having M×N arms; and a control unit that controls the first motor and the second motor through the inverter, wherein at least one of the first motor and the second motor has as many teeth as the number of phases of the motor multiplied by an integer, and the M×N coils of the motor are wound around the teeth by equal to or more than two coils for each of the teeth, the M×N drive points of the first motor are connected to output points of the corresponding arms of the inverter, the N×M drive points of the second motor are connected to output points of the arms of the inverter, so that n phase coil (n=1, 2, . . . , N) in each of the M groups of the second motor is connected to each of the N drive points of the first motor, the N drive points having the same phase, and the control unit feeds M×N pulse width modulation control signals to the inverter during a drive period of the first motor so that driving patterns of the phase coils are identical among all the N groups of the first motor, and the control unit feeds N×M pulse width modulation control signals to the inverter during a drive period of the second motor so that driving patterns of the phase coils are identical among all the M groups of the second motor.