Sectional rotor structure for permanent magnet synchronous motor

Abstract

A sectional rotor structure for a permanent magnet synchronous motor comprises a rotating shaft, a rotor core, permanent magnets, rotor pole shoes, a front end-plate and a rear end-plate, wherein a plurality of rotor baffles are arranged between the two end-plates; the rotor pole shoes are independent of one another and axially distributed at intervals together with the rotor baffles; the rotor baffles divide axially a rotor into a plurality of rotor units; two end surfaces of the rotor pole shoes in each rotor unit are respectively clung to the end surfaces of the adjacent rotor baffles; the rotor pole shoes in each rotor unit correspond to the permanent magnets; through holes allowing the permanent magnets to penetrate are formed on the rotor baffles; pole shoe draw-in bolts penetrate the front end-plate, the rotor pole shoes, the rotor baffles and the rear end-plate and axially lock the rotor pole shoes and the rotor baffles, which are arranged between the front and the rear end-plates; and the corners of the through holes of the rotor baffles are in arc transition, and clearances are kept between the permanent magnets and the permanent-magnet through holes on the rotor baffles. The sectional rotor structure for the permanent magnet synchronous motor has the advantages of high mechanical strength and suitability for motors rotating at high speed.

Description

technical field [0001] The invention relates to a rotor structure of a radial permanent magnet synchronous motor, in particular to a permanent magnet built-in segmented permanent magnet synchronous motor rotor for a permanent magnet traction motor of a high-speed railway train. Background technique [0002] The motor is an electromagnetic device that converts mechanical energy and electrical energy through the medium of a magnetic field. In order to establish the air-gap magnetic field necessary for electromechanical energy conversion inside the motor, there are two methods. One is to pass current through the motor windings to generate a magnetic field, such as ordinary DC motors and electric motors. This kind of electrically excited motor not only needs to have special windings and corresponding devices, but also needs to be continuously supplied with energy to maintain the current flow; the other is to generate a magnetic field by a permanent magnet. Due to the inherent ...

AI Technical Summary

Problems solved by technology

[0008] This kind of permanent magnet motor rotor has the following disadvantages: 1. The centrifugal force on the rotor pole piece is jointly borne by the end plate, the partition plate and the positioning tension bolts, that is to say, the positioning tension bolts that fix the rotor unit need to bear the bending moment. When the rotor When rotating at high speed, the centrifugal force is very large, which may easily cause the positioning and tension bolts to be bent by centrifugal force, that is to say, the rotor is not suitable for high-speed rotating motors.

2. Although there is a magnetic separation groove in the iron core, there are still connecting parts between the iron cores between the adjacent permanent magnets, and the magnetic fields of the permanent magnets at adjacent two poles are easily connected directly through the iron core parts between the permanent magnets to cause magnetic flux leakage. That is to say, the structure cannot avoid magnetic flux leakage and the magnetic flux leakage is serious

3. The partition is set between two adjacent rotor units, and the thickness of the partition occupies the effective length of the rotor along the axial direction; when the number of rotor units used in the rotor is large and the rotor partition is thick, the rotor The effective length will be drastically reduced, affecting the electromagnetic performance of the rotor

Images