Single-phase outer rotor motor and rotor thereof

Abstract

The invention provides a single-phase outer rotor motor, which comprises a stator and a rotor surrounding the stator, wherein the stator comprises a magnetic core and windings wound on the magnetic core; the magnetic core comprises a yoke and a plurality of teeth which extend outwards along the radial direction from the outer edge of the yoke; a tooth crown is formed at the tail end of each tooth; notches are formed between the adjacent tooth crowns; each tooth crown comprises an outer wall surface toward the rotor; the rotor comprises a shell and a plurality of permanent magnets laminated in the shell; two adjacent permanent magnets along the circumferential direction of the rotor have different polarities; each permanent magnet comprises an inner wall surface facing the stator; the permanent magnets are of an asymmetric structure; the distances between the inner wall surfaces of the permanent magnets and the outer wall surfaces of the tooth crowns in the radial direction change along the circumferential direction; a uniform and asymmetric air gap is formed between the stator and the rotor; and the circumferential widths of the notches are smaller than or equal to 5 times of the minimum width of the air gap.

Description

technical field [0001] The invention relates to a single-phase motor, in particular to a single-phase outer rotor motor. Background technique [0002] Single-phase motors are often used in small power appliances such as washing machines, dishwashers, refrigerators, and air conditioners. According to the position of the stator and the rotor, it is usually divided into two types: inner rotor and outer rotor. As the name implies, a single-phase outer rotor motor means that the stator is inside, and the rotor surrounds the outside of the stator. The load part can be directly embedded on the rotor. For a single-phase motor, since the number of poles of the rotor and the stator is the same, if the magnetic poles of the rotor are directly opposite to the magnetic poles of the stator in the radial direction when the rotor stops, a dead point will be formed, causing the rotor to fail to start next time. Contents of the invention [0003] In view of this, an external rotor motor an...

AI Technical Summary

Problems solved by technology

For a single-phase motor, since the number of poles of the rotor and the stator is the same, if the magnetic poles of the rotor are directly opposite to the magnetic poles of the stator in the radial direction when the rotor stops, a dead point will be formed, causing the rotor to fail to start next time

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