Patent ID: 9071179
Filing Date: 2015-06-30
Classification: H02P

Abstract:
1. A single-phase brushless motor comprising: a rotor that is rotated about a rotation shaft; a stator that faces the rotor with a gap; a plurality of coils that are provided on the stator and configured so as to be driven in a single phase; a sensor that detects a magnetic pole position based on rotation of the rotor; and an energization mechanism that drives the rotor at a predetermined rotational speed by switching an energizing direction with respect to the coil based on magnetic pole information which is output from the sensor; wherein the energization mechanism switches a rectangular wave energization in which a voltage applied to the coil represents a rectangular waveform and a pseudo-sine wave energization in which applied voltage represents a waveform of a pseudo-sine wave, and switching between the rectangular wave energization and the pseudo-sine wave energization is performed by gradually changing the waveform; and in the pseudo-sine wave energization, the waveform of the applied voltage in the half period portion corresponds to a sine curve shape which is gradually changed by being continued in a stepwise manner.