Motor drive control device and motor drive control method

A motor drive control method for outputting a drive control signal for performing advance-angle control on a motor to drive the motor, and outputting a drive signal to the motor with a phase based on the drive control signal to drive the motor, the method comprising:

• a current detecting step of detecting a voltage value corresponding to a drive current of the motor;
• a cross-timing detecting step of detecting cross-timings between the voltage value detected in the current detecting step and each of two or more reference voltage values, wherein at least one of the two or more reference voltage values is larger than another one of the two or more reference voltage values;
• and
• an advance-angle control step of performing the advance-angle control based on time interval(s) between the detected cross-timings in the cross-timing detecting step to adjust a phase of the drive current,
• wherein the control circuit detects a first cross-timing between the voltage value and a first reference voltage value, and a second cross-timing between the voltage value and a second reference voltage value larger than the first reference voltage value when the voltage value increases, detects a third cross-timing between the voltage value and the second reference voltage value and a fourth cross-timing between the voltage value and the first reference voltage value when the voltage value decreases, compares a first interval from the first cross-timing to the second cross-timing with a second interval from the third cross-timing to the fourth cross-timing, and performs the advance-angle control based on a comparison result between the first interval and the second interval.