Method for measuring the counter electromotive force coefficient of AC permanent magnet synchronous motor dedicated to elevators and elevator operation and maintenance methods

Abstract

The invention discloses a method for measuring the back electromotive force coefficient of an AC permanent magnet synchronous motor dedicated to an elevator, which includes the following steps: 1) Initialize each variable of the measurement algorithm, and calculate the PI current loop controller through the motor resistance and inductance obtained in the early stage 2) use the vector control strategy of Id=0, use the double closed-loop motor control method, use the PI controller as the current loop control controller and the speed loop controller, make the AC permanent magnet synchronous motor run to the first speed v1; 3) When the first speed is stable, record the first voltage u1 at this time; 4) Change the speed of the motor so that the motor runs smoothly at another second speed v2; 5) Use the low voltage with the same parameters as in step 3) Filter the output voltage of the q-axis at this time through a filter, and record the second voltage u2; calculate the starting electromotive force coefficient from the two measured values. The invention also discloses an elevator operation and maintenance method.

Description

technical field [0001] The invention relates to the field of motor and elevator traction control, in particular to a method for measuring the counter electromotive force coefficient of an AC permanent magnet synchronous motor dedicated to elevators and an elevator operation and maintenance method based on the measurement method. Background technique [0002] AC permanent magnet synchronous motors are widely used in the field of elevators, which have the advantages of high efficiency, large torque at low speed, and stable torque. However, in daily use, due to the variable load of the elevator and the variable friction coefficient of the elevator, it is difficult to measure the back electromotive force of the motor by the traditional method; however, the back electromotive force is a very important parameter when the permanent magnet synchronous motor is running. Accurate back electromotive force values ​​can make the motor run smoothly, accelerate the response quickly, and re...

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Problems solved by technology

[0005] The other is the single-phase injection voltage method, which has poor measurement effect for multi-stage motors or high-current motors

In addition, this method needs to accurately obtain the stator and rotor resistance and inductance of the motor, which is affected by the salient pole effect of the permanent magnet synchronous motor itself, so the accuracy is relatively poor

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