Single-phase brushless motor

Abstract

The invention provides a single-phase brushless motor. The single-phase brushless motor comprises a stator and a rotor capable of rotating relative to the stator, wherein the rotor comprises a plurality of permanent magnetic poles; the stator comprises a magnetic core and a winding wound on the magnetic core; the stator magnetic core comprises an outer ring part, an inner ring part and a plurality of wire winding parts connected between the inner ring part and the outer ring part; the winding is wound on the wire winding parts; the rotor is stored in the inner ring part; a uniform air gap is formed between the inner ring part of the stator and the rotor; the inner surface of one part, located between the adjacent wire winding parts, of the inner ring part is provided with a concave part; the center of the concave part is deviated from the symmetrical center of the adjacent wire winding parts; a starting angle of the motor is greater than a 45-degree electrical angle and is smaller than a 135-degree electrical angle, so that the bidirectional startup of the rotor of the motor is realized.

Description

technical field [0001] The invention relates to a single-phase brushless motor, in particular to a single-phase brushless motor capable of starting in two directions. Background technique [0002] Figure 8 Shown is a single-phase brushless motor in the prior art. The stator core of the motor adopts an integral structure, that is, the outer ring part and the tooth part of the stator core are formed into an integrated structure at the same time. Notches are arranged between them, and an uneven air gap is formed between the inner surface of the pole piece opposite to the rotor and the rotor magnet. For the single-phase brushless motor with this structure, the existence of the notch will cause the motor to generate a large positioning torque, thereby generating vibration and noise. Moreover, the positioning effect produced by the uneven air gap is restricted by the notch, the positioning starting angle is small, the starting reliability is poor, and the rotor can only start fr...

AI Technical Summary

Problems solved by technology

The single-phase brushless motor with this structure, due to the existence of the notch, will cause the motor to generate a large positioning torque, resulting in vibration and noise

Moreover, the positioning effect caused by the uneven air gap is restricted by the notch, the positioning starting angle is small, the starting reliability is poor, and the rotor can only start from one direction

The stator core has an integrated structure, and often only reciprocating shuttle winding machines can be used in production. The winding production efficiency is low, time-consuming and material-consuming

Images