Manufacturing method of directional drawing magnetic slot wedge

Abstract

The invention discloses a manufacturing method of a directional drawing magnetic slot wedge. The directional drawing magnetic slot wedge comprises a rectangular box-shaped die, wherein the die is internally provided with two baffle plates which are used for dividing the inner part of the die into three areas, one ends of the two baffle plates are fixedly arranged at the middle part at one side of the die together, the other ends of the two baffle plates are respectively leaned against the other side of the die, and thus the areas among the two baffle plates are in an isosceles triangle shape; the manufacturing method specifically comprises the following steps of drawing the areas at two sides into B-stage magnetic slot wedges by adopting heat-resisting H-stage epoxy adhesives, soft magnetic materials and reinforced materials, and manufacturing an integrated magnetic slot wedge by drawing and solidifying the areas at the two sides and the area at the middle part by also adopting the heat-resisting H-stage epoxy adhesives and the reinforced materials. According to the directional drawing magnetic slot wedge disclosed by the invention, tooth harmonic can be effectively restrained, leakage magnetic flux between teeth can be reduced, the leakage magnetic flux is converted into effective magnetic flux, and the problem of a common magnetic slot wedge that the starting torque and the maximum torque of an electric motor are reduced while the efficiency of the electric motor is increased is solved. The manufacturing method disclosed by the invention can be widely applied to electric motor manufacturing.

Description

technical field [0001] The invention belongs to the technical field of motor manufacturing, in particular to a manufacturing method for directional drawing magnetic slot wedges. Background technique [0002] The slot shape of the stator punching piece is an open slot, and the slot wedge is made of non-magnetic material, because the magnetic permeability of air is very low. It will cause the change of cogging reluctance to be intensified, and the distribution of the air gap magnetic field is a non-sinusoidal function. It contains high-order tooth harmonic components, which causes the increase of the motor excitation current, the increase of the rotor surface loss and the pulse vibration loss. It will cause the temperature of the motor to rise, the efficiency will decrease, and vibration and noise (electromagnetic noise) will be generated, and even the torque curve of the asynchronous motor will be distorted. and other performance degradation. The magnetic slot wedge can im...

AI Technical Summary

Problems solved by technology

While these magnetic slot wedges improve the efficiency of the motor, they always cause a decrease in the starting torque and maximum torque of the motor, and a decrease in the voltage regulation efficiency; when the relative magnetic permeability of the magnetic slot wedge is high, the magnetic flux leakage will increase and the torque will decrease ; Conversely, if the relative magnetic permeability is too low, the effect of magnetic slot wedges on improving motor efficiency, reducing temperature rise, and reducing noise and vibration is not obvious

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