Motor driver control method, motor driver control device, motor control device, and image forming apparatus

A motor driver control device controlling a plurality of switching devices that drive a motor, the motor driver control device comprising:

• a duty control unit configured to receive a first pulse signal having a first predetermined duty and a second pulse signal having a second predetermined duty and to restrict a duty of a first pulse width modulation signal so as to generate a second pulse width modulation signal having a duty between the first predetermined duty of the first pulse signal and the second predetermined duty of the second pulse signal;
• and
• a switching device control signal generator unit configured to include a logic circuit that operates the second pulse width modulation signal as a clock, and configured to generate a plurality of switching device control signals to control the plurality of respective switching devices, based on the second pulse width modulation signal having the duty between the first predetermined duty of the first pulse signal and the second predetermined duty of the second pulse signal, to select a phase of the motor,
• wherein the switching device control signals change state upon a next change of the second pulse width modulation signal from one of low state and high state to the other of said low state and high state.