CIRCUIT FOR PREVENTING MALFUNCTION OF MOTOR

摘要

PURPOSE:To provide a circuit for preventing the malfunction of a motor, which can prevents the malfunction of the motor even if the reference signal required for rotating the motor at constant speed ceases due to some cause. CONSTITUTION:According to this invention, even if the reference signal required for rotating a motor 1 at constant speed ceases due to some cause, a frequency comparison circuit 7 detects that the frequency of the reference signal has become lower than the frequency of an oscillating signal, so the supply of the driving signal to the motor 1 is stopped.