Preparation method of built-in self-starting permanent magnetic synchronizing motor rotor

Abstract

The invention provides a preparation method of a built-in self-starting permanent magnetic synchronizing motor rotor. The method comprises the steps of 1, overlapping an iron core of a rotor; 2, performing aluminum casting or a self-starting cage of the rotor; 3, assembling a permanent magnet; the process of overlapping the iron core of the rotor comprises the steps of (1) fixing a fake key on a fake shaft; (2) arranging the arranged rotor punching sheets into the fake shaft by sleeving, wherein the overlapped rotor punching sheets being 20 to 25mm in thickness sleeve the fake shaft, then a fake magnetic steel positioning bar is inserted and positioned in a permanent magnet groove, and then the rest rotor punching sheets sequentially the fake shaft, so as to ensure the flatness of the permanent magnet slot in the iron core of the rotor; (3) overlapping and fastening through a press; the process of assembling of the permanent magnet comprises the steps of (1) performing the permanent magnet pushing process for the permanent magnet slot of the aluminum casted rotor; (2) marking the polarity; (3) positioning the permanent magnet into the permanent magnet slot of the rotor; (4) fixing a circular aluminum alloy cover plate of the rotor. The method is simple in process, practical, and high in first pass yield of the products, and reduces the production cycle of the products.

Description

technical field [0001] The invention relates to a method for preparing a built-in self-starting permanent magnet synchronous motor rotor, belonging to the technical field of permanent magnet synchronous motors. Background technique [0002] In recent years, the asynchronous start permanent magnet synchronous motor has attracted wide attention from all aspects due to its excellent performance such as high efficiency and power factor. Many studies have been done on the mechanism and improving the operating efficiency and power factor of the motor. It is believed that the processing technology is crucial to the energy efficiency and quality of the permanent magnet motor, but there are few mature technologies. [0003] At present, in the manufacturing process of the permanent magnet motor rotor, the manufacturing process of the iron core still adopts false shaft positioning, resulting in irregular stacking of the iron core, exceeding the tolerance of the permanent magnet slot si...

AI Technical Summary

Problems solved by technology

[0003] At present, in the manufacturing process of the permanent magnet motor rotor, the manufacturing process of the iron core still adopts false shaft positioning, resulting in irregular stacking of the iron core, exceeding the tolerance of the permanent magnet slot size, and difficult assembly of the permanent magnet, which affects the performance and development cycle of the permanent magnet motor. and production efficiency

[0004] Fill the permanent magnets into the slots and fix them with epoxy resin. When inspecting the polarity of the magnetic steel, if there is a piece of permanent magnet with the wrong polarity, it is not easy to rework. The broken permanent magnets in the entire slot are broken and cannot be reused.

[0005] Using the shaft hole keyway for positioning, the positioning method has low accuracy, the quality of the rotor core cannot meet the accuracy requirements, the flatness of the permanent magnet groove cannot be guaranteed, and the quality of the iron core cannot meet the accuracy requirements

The usual solution is to manually grind the permanent magnet groove to increase the air gap on both sides of the permanent magnet groove so that the permanent magnet can be installed in the permanent magnet motor rotor, but this process wastes a lot of time and manpower and prolongs the life of the permanent magnet groove. The production cycle of the motor and the processing cost of the motor are increased, and it is easy to cause the deterioration of the performance of the permanent magnet motor due to the increase of the air gap in the magnetization direction of the permanent magnet slot of the motor

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