Open-phase detection method and detection apparatus for three-phase permanent magnet synchronous motor

Abstract

The invention is suitable for the field of a three-phase motor and provides an open-phase detection method and detection apparatus for a three-phase permanent magnet synchronous motor. The method comprises the following steps: controlling a straight shaft of a motor rotor to be positioned to the shaft center of a motor A phase winding; detecting currents of B and phase windings; judging whether the B and C phase windings are in an open-phase state based on the currents of the B and phase windings; if the B phase winding or the C phase winding is in the open-phase state, outputting a failure warning signal; if the B and C phase windings are not in the open-phase state, controlling the motor to rotate to the place where a rotor position angle is 30 DEG and recording the rotation angle of a motor; judging whether the motor A phase winding is in the open-phase state based on the rotation angle of the motor; and if the motor A phase winding is in the open-phase state, outputting the failure warning signal. According to the method, the open-phase detection of the star-shape-connected three-phase windings in the permanent magnet synchronous motor is achieved by controlling the straight shaft of the motor rotor to be positioned to the shaft center of the motor A phase winding so as to carry out open-phase judgment on the B and C phase windings, and then by rotating the motor to the place where the rotor position angle is 30 DEG so as to carry out open-phase judgment on the A phase winding.

Description

technical field [0001] The invention belongs to the field of three-phase motors, and in particular relates to a phase loss detection method and a detection device of a three-phase permanent magnet synchronous motor. Background technique [0002] As we all know, when the motor starts, if there is a phase loss, it will make an abnormal sound, which will cause the motor to fail to start. If the motor is running, if the phase loss occurs, the current of the non-phase loss winding will increase. If the motor is not stopped in time, the motor winding will be burned. , causing a major safety hazard, so the phase loss protection circuit is usually used to protect the motor from phase loss. [0003] However, the current phase loss protection circuit can only detect whether there is a phase loss in the winding of the AC induction motor, but cannot detect the phase loss of the winding of the permanent magnet synchronous motor, or can only be realized for the three-phase winding of the ...

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Problems solved by technology

[0004] The purpose of the embodiment of the present invention is to provide a phase loss detection method of a three-phase permanent magnet synchronous motor,

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