Motor drive device

A motor drive device for alternately driving a plurality of motors, which motor drive device comprising:

• a position detection signal processing circuit for processing position detection signals of the plurality of motors;
• a pre-drive circuit for generating an excitation switching signal of the plurality of motors;
• a plurality of power switching circuits for supplying an electric current in response to an output from the pre-drive circuit to the plurality of motors;
• a motor switching circuit for instructing a switchover of driving the plurality of motors,
• wherein the position detection signal processing circuit selects, in response to an input to the motor switching circuit, a position detection signal of one of the motors to be driven out of the position detection signals of the plurality of motors, and inputs a position detection processed signal to the pre-drive circuit, and then one of the plurality of power switching circuits is selected for driving the motor to be driven.