Method for detecting loss of field of rotor of permanent magnet synchronous motor

Abstract

The invention relates to a method for detecting loss of field of a rotor of a permanent magnet synchronous motor and belongs to the technical field of electric automobile power assembly. The method comprises steps of setting the rotary speed by using a host computer, controlling the motor to run to be in a stable state, increasing the current value continuously, observing whether the torque measured by a dynamometer is increased correspondingly, primarily determining whether a permanent magnet synchronous motor rotor is in loss of field, under the condition that the loss of field may exist, controlling the motor to run in an empty mode to be in a stable state, decreasing the current value continuously, observing whether the difference of all-phase motor voltage and motor no-load back electromotive force rating data measured by the dynamometer is large, and determining whether the permanent magnet synchronous motor rotor is in loss of field. Under the condition that any device is not added, the quick detection of loss of field of car motors can be achieved based on the test of the permanent magnet synchronous motor, the detection speed of the permanent magnet synchronous motor of the electric car is greatly improved, the implementation mode is simple, the cost is low and the application range is wide.

Description

technical field [0001] The invention relates to the technical field of electric vehicle power assembly, in particular to the technical field of electric vehicle permanent magnet synchronous motors, in particular to a method for detecting loss of magnetism of a permanent magnet synchronous motor rotor. Background technique [0002] In recent years, with the rapid increase of car ownership worldwide, resource and environmental problems have become increasingly prominent. Due to the advantages of cleanliness, no pollution, high efficiency and diversified energy sources, electric vehicles have broad development prospects as a green transportation tool to replace fuel vehicles. All countries are stepping up the research and development of electric vehicles. With the continuous development of electric vehicles, their safety issues have become more prominent. [0003] The over-temperature, over-current and vibration of electric vehicles will cause the problem of demagnetization of...

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Problems solved by technology

This method is more cumbersome, and the reliability needs to be improved

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