| 摘要 |
To ensure the startup stability of a motor simply and without incurring costs. A motor drive control device (20) uses a rotor position sensorless control scheme to drive a fan motor (51). The motor drive control device (20) detects or estimates the rotational speed of the fan motor (51) at least at the time of a state just before startup of the fan motor (51) and starts up the fan motor (51) by outputting to the fan motor (51) drive voltages (SU1 to SW1) based on a direct-current excitation scheme and/or a forced drive scheme. The direct-current excitation scheme is a scheme that performs direct-current energization with respect to the fan motor (51) to fix a rotor position, and the forced drive scheme is a scheme that accelerates the motor to a predetermined rotational speed by performing forced energization that applies a predetermined voltage and frequency with respect to the fan motor (51). Moreover, the motor drive control device (20) changes, in accordance with the rotational speed of the fan motor (51) that has been detected or estimated, the drive voltages (SU1 to SW1) based on the direct-current excitation scheme and/or the forced drive scheme. |
