Blockage detection method and device

Abstract

The invention provides a stall detection method, a stall detection device, a computer-readable storage medium and a motor drive device, wherein the stall detection method includes: obtaining the input power of the motor in real time; calculating the fluctuation value of the input power; comparing the fluctuation value and the fluctuation threshold, when the fluctuation value is less than the fluctuation threshold for a preset period of time, it is determined that the motor is locked. The locked-rotor detection method provided by the present invention is especially suitable for AC motors without position sensors. By monitoring the fluctuation value of the input power which is not affected by the position angle, it can accurately detect whether the motor is locked-rotor. It can be applied in either the torque current control mode or the speed control mode, which makes up for the deficiencies of the prior art, has strong practicability, and has high safety and reliability.

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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