Method and system for rapidly detecting demagnetization of permanent magnet synchronous motor of electric vehicle

The invention discloses a method and a system for quickly detecting demagnetization of a permanent magnet synchronous motor of an electric automobile, which relate to the technical field of automobile detection and comprise a data acquisition step, an effective working condition determination step, a current change determination step, an efficiency determination step, a critical threshold determination step and a demagnetization aging judgment step. According to the method, the demagnetization aging degree of the motor is analyzed, the calculated amount is small, online real-time detection can be achieved, and the reliability is high. 本发明公开了一种电动汽车永磁同步电机退磁快速检测方法及系统，涉及汽车检测技术领域，包括数据获取步骤、有效工况确定步骤、电流变化确定步骤、效率确定步骤、临界阈值确定步骤和退磁老化判断步骤。本发明对电机退磁老化程度进行分析，计算量小，可在线实时检测，可靠性高。