Motor control stall detection method, device and motor drive device

Abstract

The invention belongs to the field of AC motor control and especially to a locked rotor detection method and apparatus of motor control of a non-position sensor, and a motor driver. In the locked rotor detection method and apparatus, the phase current of an AC motor is obtained through a current detection unit, and an estimated rotating speed of the motor is obtained through estimating and calculating. The estimated rotating speed is taken as a determining parameter and is compared to a preset threshold, when the estimated rotating speed continues to exceed the preset threshold for a time period, it is determined that a locked rotor occurs in the motor, a determination result is fed back to a control unit, and the control unit stops sending driving signals so as to realize shutdown protection of the AC motor. The scheme provided by the invention can be applied to a torque current control mode or a rotating speed control mode of a motor, making up the deficiency of the prior art. Correspondingly, the motor driver with the locked rotor detection apparatus built therein can realize locked rotor detection under the torque current control mode or the rotating speed control mode, the practicality is high, and the safety and reliability are high.

Description

technical field [0001] The invention belongs to the field of AC motor control, and in particular relates to a motor control stall detection method and device without a position sensor, 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] In current AC motors, such as three-phase motors, the locked-rotor protection mainly judges the locked-rotor phenomenon of the motor by sampling the phase current or the magnitude of the mutual inductance phase current. However, due to the particularity of its application, some motors often adopt a control scheme without position sensors, such as the fan of an air conditioner...

AI Technical Summary

Problems solved by technology

[0004] In view of this, the object of the present invention is firstly to provide a stall detection method controlled by a position sensorless motor, to solve the technical problem that the prior art cannot accurately judge whether a motor using position sensor control is stalled

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