Permanent magnet motor loss test method

Abstract

The invention discloses a test method, and simultaneously discloses an integrated test system for loss of a permanent magnet motor, wherein the key points of design lie in replacement of a false rotor or a false stator of the permanent magnet motor and cooperation with a magnetic levitation bearing. The test system consists of a source power machine, a torque tachometer, a measured motor and a load. The system disclosed by the invention is applied to testing, the loss of the motor can be tested during the motor manufacturing process, and the measuring result of the loss of each part is given out. The test method comprises wind friction loss test, bearing friction loss test, iron core loss test and eddy flow loss test. The test method is particularly suitable for a high-speed permanent magnet motor, and can separate the iron core loss, eddy flow loss, wind friction loss and mechanical loss of the motor. The method solves the problem that the loss of the high-speed permanent magnet motor is difficult to separate. According to the method, the accuracy of loss test is improved, the loss test cycle is reduced, and the method is easy to realize.

Description

technical field [0001] The invention relates to a method for testing the loss of a motor, in particular to a method for testing the loss of a permanent magnet motor. Background technique [0002] With the continuous improvement of the performance of permanent magnet materials and the development of motor technology, permanent magnet motors have been widely used in various fields of the national economy. The permanent magnet motor with the surface rotor structure has become one of the main structures of the permanent magnet motor due to its simple manufacture and low cost. In the structure of surface permanent magnet motors, especially high-speed permanent magnet motors, the surface of the rotor is generally fixed with binding tape or alloy sheath to fix the permanent magnet of the rotor, and the alloy sheath relies on simple manufacturing process and good thermal conductivity of the sheath to become the sheath material primary choice. However, due to the existence of air-g...

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Problems solved by technology

However, due to the existence of air-gap magnetic density harmonic magnetic field, a large eddy current will be induced in the alloy sheath, forming eddy current loss. If the loss is too large and the heat cannot be dissipated in time, it will increase the temperature rise of the rotor and reduce the The excitation performance of the permanent magnet even causes the permanent magnet to lose its magnetism at high temperature, so it is of great significance to the test and analysis of the eddy current loss of the rotor. In addition, it is also of great significance to the test and research of the high frequency iron loss of the motor

[0003] In recent years, many scholars have carried out a lot of research on the calculation of permanent magnet motor loss, and constantly put forward new calculation methods. However, for the test of permanent magnet motor loss, especially the separation of permanent magnet motor stray loss and the use of surface ferromagnetic alloy The test of the eddy current loss of the sheath structure permanent magnet motor is still a difficult point of the motor loss test

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