Method and device for detecting state of permanent magnet in permanent magnet synchronous motor and vehicle
A permanent magnet synchronous motor and detection method technology, applied to the detection device of the permanent magnet state in the permanent magnet synchronous motor for vehicles, the detection of the permanent magnet state in the permanent magnet synchronous motor for vehicles, the field of vehicles, and can solve the problem of large demagnetization of permanent magnets Risk and other issues, to achieve the effect of simple and effective detection
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[0031] In order to realize the monitoring and protection of the permanent magnet, the method adopted in the related art is: when the permanent magnet synchronous motor is controlled, the temperature of the stator winding is detected by the temperature sensor embedded in the stator winding of the permanent magnet synchronous motor, so as to prevent the permanent magnet synchronous motor. The operating temperature is too high.
[0032] However, the inventor found that the temperature sensor embedded in the stator winding of the permanent magnet synchronous motor cannot effectively monitor the temperature of the rotor of the motor in time, and thus cannot effectively monitor the state of the permanent magnet. When the permanent magnet is demagnetized, it cannot be detected, and information on whether the permanent magnet is demagnetized cannot be obtained. Once the permanent magnet synchronous motor is demagnetized, it will gradually deteriorate, accelerate the demagnetization, a...
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