Patent ID: 7932689
Filing Date: 2011-04-26
Classification: H02P

Abstract:
1. A motor drive system for driving a motor provided with a plurality of windings, comprising a numerical control device for outputting a position command, a plurality of axis control parts for outputting PWM commands using the position command, each of the plurality of axis control parts is incorporated in the numerical control device, a plurality of current supply parts which supply current to the respective windings based on the respective PWM commands, and which are connected to the respective windings, a motor position detector for detecting a rotor position of the motor, and outputting a rotor position detection signal, a first signal supply part for supplying the rotor position detection signal output from the motor position detector to one current supply part of the plurality of current supply parts, and a second signal supply part for supplying the rotor position detection signal supplied through said first signal supply part to the axis control part corresponding to said one current supply part, wherein the corresponding axis control part outputs a PWM command based on the rotor position detection signal supplied from said one current supply part through the second signal supply part to the corresponding axis control part and the position command, the remaining axis control parts output a PWM commands based on the rotor position detection signal supplied from the corresponding axis control part to the remaining axis control parts and the position command, and wherein each of the plurality of axis control parts includes a selection part for selecting whether the rotor position detection signal supplied to said one current supply part is to be used, or the rotor position detection signal supplied to the remaining axis control parts is to be used.