Motor

Abstract

The invention relates to high-speed rotating equipment, in particular to a motor. The motor provided by the invention comprises a rotor, a bearing, a bearing seat, a shell assembly, a base and an elastic piece; the rotor is provided with an extending end and a tail end which are opposite; the bearing sleeves the rotor and is close to the tail end; the bearing seat is matched with the shell assembly and abuts against the end face of one side, close to the extending end, of the bearing; the base is matched with the shell assembly; the elastic piece can generate elastic force in the axial direction of the rotor; the elastic piece is provided with a first end and a second end which are opposite in the elastic force direction, the first end is matched with the base, and the second end is matched with the bearing seat; and a heating piece is arranged in the base, the base can be heated to expand in the elastic force direction of the elastic piece, and the base can be cooled to retract in the direction opposite to the expansion direction. The pretightening force between the bearing and the bearing seat can be adjusted when the rotor rotates.

Description

technical field [0001] The invention relates to high-speed rotating equipment, in particular to a motor. Background technique [0002] Due to the advantages of high speed and direct drive, high-speed rotating equipment is more and more recognized by the market. The supporting structure of high-speed rotating equipment mainly consists of magnetic suspension bearings, air bearings, rolling bearings, etc. [0003] The rolling bearings used in high-speed rotating equipment are generally precision angular contact ball bearings. Due to their structural characteristics, angular contact ball bearings require axial preloading of the bearings. The conventional preloading scheme is positioning preloading or constant pressure preloading. The preloading force of the above two preloading schemes will change with the axial displacement of the preloading structure. [0004] High-speed rotating equipment such as motors generate a relatively large amount of heat during operation, and the tem...

AI Technical Summary

Problems solved by technology

This will cause the axial preload of the motor to be different in cold state, working state, and rated state. Angular contact ball bearings may be under-preloaded or over-preloaded, resulting in abnormal noise, heat or vibration of the bearing, which will affect the bearing life during long-term operation.

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