| In recent years, electric automobile industry has made rapid development. Permanent-magnet synchronous motors are gradually favored by electric automobile manufacturers because of their advantages such as high power factor, high efficiency, high power density, and so on. At the same time, NdFeB permanent-magnet material is the first choice of permanent-magnet synchronous motors because of its superior magnetic performance. However, the reliability of the motor is affected by the performance stability of permanent-magnet material in permanent-magnet synchronous motors.The contents researched in this paper originated from The National "863" Project - Research on Performance Stability Evaluation Technology of Magnetic Material in Motor Vehicle (No. 2006AA11A182). Evaluation technologies of magnetic material reliability and performance stability are researched against the bad environment and dynamic working conditions. The main researched contents are given as follows:(1) Motor vehicle integrated environmental simulation system is designed according to its operation condition.(2) A motor vehicle permanent-magnet synchronous motor is designed based on test conditions in order to research the performance stability of the magnetic material in motor vehicle.(3) Performance stability of magnetic material in motor vehicle is researched from several aspects such as high temperature, vibration, corrosion and big demagnetization current according to the operation conditions. Research corresponding test method. And several types of permanent magnent are tested, in order to validate feasibility and reliability of test method.(4) Evaluation method is modified based on the test results, and complete method for analyzing reliability and performance stability of permanent-magnet material motor vehicle is summed up.
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