Rotor structure of radial permanent magnet synchronous motor

Abstract

The invention discloses a rotor structure of a radial permanent magnet synchronous motor, which comprises a rotating shaft, a rotor iron core, permanent magnets, rotor pole shoes, a left end plate and a right end plate, wherein a plurality of rotor partition boards, which are made from non-magnetic conductive 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; the rotor partition boards partition a rotor into a plurality of rotor units axially; the two end faces of the rotor pole shoe in each rotor unit are closely contacted with the end faces of the rotor partition boards adjacent to the rotor pole shoe, respectively; one rotor pole shoe in each rotor unit is corresponding to one permanent magnet; through holes, which permit the rotor iron core and the permanent magnets to penetrate, are arranged on the rotor partition boards; tension bolts penetrate through the left end plate, the rotor pole shoes, the rotor partition boards and the right end plate; and the tension bolts axially lock the left end plate, the right end plate, and the rotor pole shoes and the rotor partition boards between the left end plate and the right end plate. The rotor structure of the radial permanent magnet synchronous motor disclosed by the invention has the advantages of high mechanical strength and applicability to high-speed rotating motors.

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 radial permanent magnet 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 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 inherent characterist...

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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 bent 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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