Patent ID: 8115423

Claim:
A motor driving system comprising: a plurality of motors; a motor driving device provided to correspond to each of said plurality of motors to generate motor driving current for driving a corresponding motor of said plurality of motors by switching operations of power semiconductor elements; a current detector provided to correspond to each said motor driving device to detect the corresponding motor driving current; and a control circuit for controlling operation of each said motor driving device based on at least detected current by each said current detector, wherein: said control circuit comprises: first determining means for determining a non-energized state in each said current detector; second determining means for determining, in the current detector determined to be in said non-energized state by said first determining means, a noise state from the remaining motor driving device other than the motor driving device corresponding to said current detector; and zero point adjustment means for carrying out zero point adjustment of said current detector determined to be in said non-energized state according to determination by said second determining means, and said second determining means allows execution of said zero point adjustment of the current detector by said zero point adjustment means when switching operation in said remaining motor driving device is at a stop.