| 摘要 |
PROBLEM TO BE SOLVED: To provide a sensorless motor device that requires no voltage sensor and eliminates the need to provide a data table for deriving a rotational position of a rotor from the inductance of a motor.SOLUTION: A sensorless motor device includes: a drive circuit which supplies drive electric power to a plurality of phases of a motor respectively; a current sensor which detects currents of the drive electric power supplied from the drive circuit to the plurality of phases of the motor respectively; and control means of controlling the drive circuit so as to supply the drive electric power to the plurality of phases in turn when the motor rotates, then measuring a first time between peaks of currents appearing in order at the respective phases based upon a detection result of a current sensor and also measuring a second time from the start of supply of the drive electric power within the first time until when the current reaches the peak based upon a detection result of the current sensor, and calculating a third time by subtracting the second time from the first time so as to determine next supply stop timing of the drive electric power by the drive circuit and next supply start timing of the drive electric power based upon the third time. |
