Stator punched plate of single-phase direct current brushless motor

Abstract

A stator punched plate of a single-phase direct current brushless motor comprises a stator punched plate body and is characterized in that the inner arc of the stator punched plate body is in a step tooth shape, an asymmetrical continuous arc shape or an eccentric circular arc shape, the circular arc of the inner arc is transited by an offset circular arc, the offset direction is directed to a corresponding stator tooth portion, the radius of the offset circular arc is R, the radius of the stator inner arc before offset is R0, the center of a circle offset circle radius of the offset circular arc is r, the circle center offset angle of the offset circular arc with a central axis serving as a basic reference is alpha, the offset distance of the intersection point between the offset circular arc and the stator tooth central axis of the stator punched plate is e, the relations among the R, the R0, the r, the alpha and the e conform to a cosine law, and the radius of the offset circular arc can be determined. According to the stator punched plate of the single-phase direct current brushless motor, an optimized stator punching inner arc structure is utilized, the flux density distribution in air gaps of the punching structure which is a step tooth shape and a continuous arc shape tooth is rearranged, the flux density transition tends to be even, the starting torque is improved by about 14.48%, the average output torque is improved by 0.6%, the torque pulsation is decreased by 2.1%, the electromagnetic noise and vibration of a motor are improved, and the efficiency of the motor is increased.

Description

technical field [0001] The invention relates to a stator punch of a single-phase DC brushless motor, which is mainly suitable for a single-phase DC brushless motor used in a refrigerator fan, and belongs to the optimization technology of the tooth shape of a stator punch used in a single-phase DC brushless motor. Background technique [0002] Traditional stator punching for single-phase DC brushless motors, the teeth of the stator punching adopt an asymmetric structure (stepped tooth shape or continuous arc tooth shape), which provides the starting torque of the motor to make the motor run. When the stator punch adopts an asymmetric stepped tooth structure, when the arc section transitions to the stepped section, the magnetic energy distribution in the air gap changes suddenly, the motor output fluctuates greatly, and the torque ripple is as high as ±115.42%. When the continuous arc tooth structure directly replaces the stepped tooth shape, the maximum starting torque of the...

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Problems solved by technology

However, its structure is complicated, its manufacturing cost is high, and it fails to achieve the desired effect in actual use.

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