Single-phase brushless motor
AssigneeNidec Corporation
InventorMasatomo Ishikawa
Life of this patent
Estimating the term…
Abstract
A single-phase brushless motor includes a plurality of coils configured to be driven with a single phase, a sensor which detects a magnetic pole change according to the rotation of a rotor, and an energization mechanism which drives the rotor at a predetermined rotational speed. The energization mechanism is arranged to switch between a rectangular wave energization in which a voltage applied to the coil represents a rectangular waveform and a pseudo-sine wave energization in which the applied voltage represents a waveform of a pseudo-sine wave. The switching between the rectangular wave energization and the pseudo-sine wave energization is performed by gradually changing the waveform.
Claims11
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.
Dependencies are inferred from the claim text.