Motor disconnection detection method, system and device

Abstract

The invention discloses a motor disconnection detection method, which is applied to frame control or vehicle control and comprises the following steps: acquiring output voltage, output current and rotating speed of a converter; calculating a first flux linkage through a voltage model according to the output voltage and the output current; according to the output current and the rotating speed, calculating through a current model to obtain a second flux linkage; judging whether the first flux linkage is consistent with the second flux linkage or not; and if not, judging that motor disconnectionoccurs. The detection method can effectively detect whether motor disconnection occurs or not, improves the reliability of motor disconnection detection, avoids the severe heating condition of the motor, and prolongs the service life of the motor. The invention also discloses a motor disconnection detection system and device, and a computer readable storage medium, which all have the above beneficial effects.

Description

technical field [0001] The present invention relates to the technical field of inverter fault diagnosis, in particular to a detection method for motor disconnection; it also relates to a detection system, device and computer-readable storage medium for motor disconnection. Background technique [0002] In the field of rail transit, a traction converter may drive two motors on the same bogie at the same time, that is, the rack control, or drive four motors on the same vehicle at the same time, that is, the vehicle control. At present, the method of detecting whether the motor is disconnected is to detect whether the motor is disconnected by detecting the negative sequence component in the output current of the traction converter. Two-phase or three-phase disconnection of the motor occurs. Since the three-phase load of the traction converter is still symmetrical after the motor is disconnected, it is impossible to effectively detect the disconnection of the motor through the a...

AI Technical Summary

Problems solved by technology

At present, the method of detecting whether the motor is disconnected is to detect whether the motor is disconnected by detecting the negative sequence component in the output current of the traction converter. Two-phase or three-phase disconnection of the motor occurs. Since the three-phase load of the traction converter is still symmetrical after the motor is disconnected, it is impossible to effectively detect the disconnection of the motor through the above-mentioned existing detection methods, resulting in the failure of the motor connected to the same The current of the unbroken motor of the traction converter increases, resulting in serious heating of the motor and affecting the service life of the motor

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