| 摘要 |
To provide a motor controlling device that reduces heat generated by an armature and switching elements when an alternating motor is activated. A motor controlling device includes: an H bridge circuit 20 that has FET 1 to FET 4 that connect and disconnect a high potential end HV and a low potential end GND of a direct-current power supply to and from an armature Lu; and an energization control unit for controlling the amount of energization of the armature Lu by the PWM control that involves changing the ratio, in a predetermined control cycle, between an energization control period, in which the FET 1 and the FET 2 are turned on and the FET 3 and the FET 4 are turned off, or the FET 3 and the FET 4 are turned on and the FET 1 and the FET 2 are turned off, and a non-energization control period, in which the FET 1 and the FET 3 are turned on and the FET 2 and the FET 4 are turned off, or the FET 2 and the FET 4 are turned on and the FET 1 and the FET 3 are turned off.
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