Permanent magnet brushless motor

Abstract

The invention discloses a permanent magnet brushless motor, which includes a motor casing, a rotor and a stator, the rotor is formed by stacking rotor punches, and the stator is formed by stacking stator punches, characterized in that: The rotor punches are provided with shaft holes, heat dissipation holes, rotor mounting holes and 8 protruding teeth in sequence from the inside to the outside. The distance between the protruding teeth is 21mm, and there is a circular groove in the center of the protruding teeth. The stator punch The sheet is provided with rotor holes, tooth slots, winding slots and stator installation holes in sequence from the inner to the outer ring. The width of the slots is 1.67mm, which optimizes the armature diameter of the motor and the slot shape of the motor. slot and optimize the rotor pole arc coefficient and notch width, the stator buckle slot is changed from the original horizontal to vertical, and then the influence on the magnetic circuit of the motor is minimized, and the shape of the stator slot shoulder is changed to make the motor stator punch Sheet molds are more durable. Compared with the original motor, the designed motor has higher efficiency, lower temperature rise, and minimal noise and torque fluctuation.

Description

Technical field [0001] The invention relates to the field of motor manufacturing, in particular to a permanent magnet brushless motor. Background technique [0002] Most of the electric vehicle motors used in the early days used permanent magnet brushless motors, using fractional slots for concentrated winding. The fractional slot concentrated winding is mainly to solve the contradiction between the number of motor pole pairs and the number of motor slots, and to reduce torque ripple. , To make the electric vehicle run as smoothly as possible. However, the eddy current loss of the fractional-slot concentrated winding is relatively large, which is not suitable for field weakening control. Although the fractional-slot concentrated winding can reduce the "cogging effect", but at the expense of part of the efficiency of the motor, at the same time distributed winding permanent magnet brushless motor , The copper wire at the end of the stator has a large span, large DC impedance of t...

AI Technical Summary

Problems solved by technology

However, the eddy current loss of the fractional slot concentrated winding is relatively large, and it is not suitable for field weakening control. Although the fractional slot concentrated winding can reduce the "cogging effect", it is at the cost of sacrificing part of the efficiency of the motor. At the same time, the distributed winding permanent magnet brushless motor , the copper wire span at the end of the stator is relatively large, the DC resistance of the coil is large, the line loss increases, and the copper material is wasted seriously. Now the country calls for "energy saving, emission reduction, high efficiency and energy saving", so it is necessary to develop a permanent magnet non-conductor with high efficiency and high torque. brush motor

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