Permanent magnet brushless motor capable of bearing ultrahigh acceleration impact

Abstract

The invention discloses a permanent magnet brushless motor capable of bearing ultrahigh acceleration impact. The permanent magnet brushless motor capable of bearing the ultrahigh acceleration impact comprises a stator assembly, a rotor assembly and a composite bearing assembly, wherein the stator assembly comprises a shell and an electromagnetic coil, and the shell comprises a machine shell, a left end cover and a right end cover; the rotor assembly comprises a rotating shaft, a permanent magnet, an end face shaft sleeve A and an end face shaft sleeve B; the composite bearing assembly comprises an auxiliary bearing, a left bearing, a right bearing, a first return spring and a second return spring; the inner wall of the shell is provided with a limiting step to bear the leftward impact of the rotor assembly; and the right end cover can be in contact with the right end of the rotating shaft to bear the rightward impact of the rotor assembly when the whole rotor assembly moves rightward. The permanent magnet brushless motor can bear ultrahigh radial acceleration impact, impact force towards the left end is dispersed to act on the machine shell and the end face shaft sleeves, and impact force towards the right end is dispersed to act on the rotating shaft and the right end cover, so the phenomenon of crushing caused by the fact that the impact force intensively acts on a small area of the end face of a sliding bearing is avoided.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet motors, and more specifically relates to a permanent magnet brushless motor that can withstand ultra-high acceleration impacts. Background technique [0002] Permanent magnet motors are widely used in military industry due to many advantages. With the continuous development of the national defense industry, the reliability requirements for permanent magnet motors such as high and low temperature resistance, impact resistance, corrosion resistance, anti-interference, and light weight continue to increase. As a core component of power, the high reliability requirements of permanent magnet motors are increasingly urgent. Taking the permanent magnet motor resistant to ultra-high impact acceleration (6000G in the radial direction and above 15000G in the axial direction) as an example, the rotor structure and bearing support system of the traditional permanent magnet motor will be decomposed, ...

AI Technical Summary

Problems solved by technology

As one of the power executive parts inside the missile, the biggest obstacle caused by the ultra-high acceleration impact to the permanent magnet motor comes from the bearing support system. The main technical difficulties are as follows: 1. The impact of ultra-high radial and axial acceleration on the ball / cylinder Roller bearings will be a fatal threat, and although high-strength sliding bearings can withstand high radial acceleration, the inherent axial play clearance and bearing end surface support structure will be damaged under the impact of ultra-high axial acceleration. It will cause the end face of the bearing or the end face of the support structure to be "crushed", and cannot be well disengaged, resulting in subsequent start-up failure

[0004] In the existing motor structure, there is a shaft sleeve and a friction pad between the sliding bearing and the rotor assembly, and there is an inherent gap between the friction pad and the end surface of the sliding bearing during normal operation (the state of no gap will cause the motor to fail to start and running), and the rotating rotor assembly intermittently moves left and right between the two sliding bearings. Wear-resistant gaskets are usually made of graphite and nylon materials to reduce friction loss. It can be seen that under the action of ultra-high axial impact , the traditional sliding bearing installation structure has a very high risk, usually manifested as sliding bearing end face crushing, friction gasket and bushing damage, deformation

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