Stator, motor, electric appliance and electric tool thereof

Abstract

The invention discloses a stator, a motor, an electric appliance and an electric tool thereof. The stator comprises a plurality of block iron cores which are the same in shape and connected with one another and windings wound on the block iron cores. Each block iron core comprises a yoke part and a tooth part. End face expanding parts are symmetrically arranged on the two end faces of each yoke part. Each yoke part is of an arc-shaped structure, and the end face expanding parts extend in the radial direction of the arc-shaped structures. Therefore, the end face expanding part provides compensation for the contact area of the adjacent block iron cores, and the compensation area provided by the end surface expansion part also increases the area of the radial supporting surface of the adjacent yoke parts, and circular distortion during splicing of the block iron cores can be reduced, so that the torque pulsation, vibration and noise of the motor are reduced, and the motor is more stable during working.

Description

technical field [0001] The invention relates to the field of motors, in particular to a segmented stator, a motor with the segmented stator, an electrical appliance with the motor and an electric tool thereof. Background technique [0002] Motors are widely used in technical fields such as construction and electromechanical processing. The main structure includes a casing, a stator and a rotor. Traditional motors are all manufactured by integral stator punching process, which brings direct problems: low winding efficiency and low filling rate of winding slots, which directly lead to low power density and torque density of the motor, and at the same time, the utilization rate of the stator silicon steel sheet is also low. Low, more wasteful. In order to solve this problem, the technical solution of segmented stators has been proposed, such as the invention patents with patent numbers "201310025392.2" and "201711372112.X". The segmented stator can be wound separately, which ...

AI Technical Summary

Problems solved by technology

Traditional motors are all manufactured by integral stator punching process, which brings direct problems: low winding efficiency and low filling rate of winding slots, which directly lead to low power density and torque density of the motor, and at the same time, the utilization rate of the stator silicon steel sheet is also low. low, more wasteful

The segmented stator can be wound separately, which can indeed improve the winding efficiency, increase the full rate of the winding slot, and improve the utilization rate of the motor stator silicon steel sheet; however, when the segmented stator is spliced, due to the fracture distribution of the end faces of the adjacent stator yokes, If they cannot be completely fitted together, an air gap will inevitably be formed at the joint of adjacent stator yokes, and the magnetic permeability of air and silicon steel sheets is very different (μ silicon steel: μ air ≈ 10000), which will inevitably lead to the yoke of the motor magnetic circuit channel The increase of reluctance at the joint will affect the smoothness of the yoke in the main channel of the motor's magnetic potential energy, resulting in magnetic flux leakage or loss of magnetic potential. Although this technical problem can be solved by increasing the size of the stator, the increase in the size of the stator not only makes the motor more cumbersome, It will also increase the cost of production. Therefore, the traditional segmented stator makes it difficult to increase the power density and torque density of the motor. In some applications where the volume of the motor is limited, such as the field of direct drive electric tools, there are a series of problems

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