Rotation blockage detection method and device

Abstract

The invention provides a locked-rotor detection method and device, a computer readable storage medium and a motor driving device, and the locked-rotor detection method comprises the steps: obtaining the input power of a motor in real time; calculating a fluctuation value of an input power; and comparing the fluctuation value with the fluctuation threshold value, and when the fluctuation value is continuously smaller than the fluctuation threshold value within a preset duration, judging that the motor stalls. The invention provides a locked-rotor detection method. The invention is especially suitable for a sensorless AC motor. By monitoring the fluctuation value of the input power which is not influenced by the position angle, whether the motor is locked-rotor can be accurately detected, the scheme can be applied to a torque current control mode or a speed control mode of the motor, the defects in the prior art are overcome, the practicability is high, and the safety and reliability arehigh.

Description

technical field [0001] The present invention relates to the field of motor control, in particular to a locked-rotor detection method, a locked-rotor detection device, a computer-readable storage medium and a motor drive device. Background technique [0002] When the motor rotates at zero speed, it still outputs torque, that is, it stalls. There are many reasons for the motor to stall, including mechanical or man-made, such as: the contact between the rotor and the stator is stuck, the driven equipment is stuck, the equipment is too loaded and the motor cannot be driven, etc., all of which will cause the stall. [0003] For current AC motors, such as three-phase motors, the stall protection mainly judges the stall phenomenon of the motor by sampling the phase current or the magnitude of the mutual inductance phase current. When the current is very large, it is considered that a stall has occurred. However, the product of the current and the sine value of the position angle i...

AI Technical Summary

Problems solved by technology

For occasions where position sensorless control is used, especially the torque current control method, it is impossible to determine whether the cause of the current increase is a locked rotor or the position angle is too small, resulting in the failure to pass the sampling phase current or mutual induction phase current. method to determine whether a stall occurs

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