| 摘要 |
The present invention ensures starting stability of a motor easily and without increasing the cost. This motor drive control device (20) drives a fan motor (51) by means of a sensorless rotor position control method. The motor drive control device (20) detects or estimates a rotating speed of the fan motor (51) at least in a state immediately before the fan motor (51) is activated and outputs drive voltages (SU1 through SW1) based on a direct-current excitation method and/or a forced drive method to the fan motor (51) in order to activate the fan motor (51). The direct-current excitation method is a method for fixing the rotor position by applying direct-current power to the fan motor (51), and the forced drive method is a method for accelerating the motor to a prescribed rotating speed by forcibly applying power having prescribed voltage and frequency to the fan motor (51). Furthermore, the motor drive control device (20) changes the drive voltages (SU1 through SW1), which are based on the direct-current excitation method and/or the forced drive method, according to the detected or estimated rotating speed of the fan motor (51). |
