Tangential permanent magnet synchronous motor rotor structure

Abstract

A tangential permanent magnet synchronous motor rotor structure comprises a rotating shaft, magnetism isolating shaft sleeves, permanent magnets, rotor pole shoes, a left end plate and a right end plate; the permanent magnets and the rotor pole shoes are distributed at intervals along the circumferences of the magnetism isolating shaft sleeves; the permanent magnets are clung to the rotor pole shoes; a plurality of rotor partition boards made from non-magnetic materials are arranged between the two end plates; the rotor pole shoes are independent from one another; the rotor pole shoes and the rotor partition boards are distributed at intervals in the axial direction; the rotor partition boards divide a rotor into a plurality of rotor units in the axial direction; and two end surfaces of one rotor pole shoe in each rotor unit are clung to the end surfaces of adjacent rotor partition boards; through holes allowing the magnetism isolating shaft sleeves to penetrate are formed on the rotor partition boards; stretching bolts penetrate the left end plate, the rotor pole shoes, the rotor partition boards and the right end plate respectively; and the stretching bolts lock the left and the right end plates and the rotor pole shoes, the permanent magnets and the rotor partition boards between the left and the right end plates in the axial direction. The tangential permanent magnet synchronous motor rotor structure has the advantage of high mechanical strength and is applicable to high-speed rotating motors.

Description

technical field [0001] The invention relates to a rotor structure of a tangential permanent magnet synchronous motor, in particular to a rotor of a tangential permanent magnet motor with built-in permanent magnets 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 synchronous 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 in...

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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 broken by centrifugal force, that is to say, the rotor is not suitable for high-speed rotating motors.

2. Although there is a magnetic isolation groove in the iron core, there are still connecting parts between the adjacent permanent magnets, and the magnetic fields of the permanent magnets of adjacent two poles are easily connected directly through the connecting parts of the iron cores between the permanent magnets, resulting in 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

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