Importance

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Abstract

A DC-brushless-motor control device supplies a current to windings of a stator of a three-phase DC brushless motor which rotates a negative pressure generation fan, and includes a rectifier that rectifies an alternating current with a voltage of 300 V or less, a booster that boosts a voltage of the current rectified by the rectifier to 360 V or more, a three-phase bridge inverter that supplies the current boosted by the booster to the windings of the three-phase DC brushless motor, and a controller that controls a rotation speed of a rotor by controlling a conduction state of the three-phase bridge inverter based on a magnetic pole position detected by a magnetic pole position detector which detects a magnetic pole position of the rotor of the three-phase DC brushless motor.

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First Claim