Method for measuring counter electromotive force coefficient of special AC permanent magnet synchronous motor for elevator and elevator operation and maintenance method

Abstract

The invention discloses a method for measuring a counter electromotive force coefficient of a special permanent magnet synchronous motor for an elevator, which comprises the steps of 1) firstly initializing variable of a measurement algorithm, and calculating parameters of a PI current loop controller according to motor resistance and inductance obtained in an earlier stage; 2) using a vector control strategy of Id=0, using a double closed-loop motor control method, using a PI controller to serve as a current loop controller and a speed loop controller, and enabling the AC permanent magnet synchronous motor to operate at a first speed v1; 3) when the first speed is stable, recording first voltage u1 at the time; 4) changing the speed of the motor, enabling the motor to stably operate at asecond speed v2; and 5) filtering output voltage of a q-axis at the time by using a low pass filter with the same parameters in the step 3), recording second voltage u2, and performing calculation onvalues measured at the two times to obtain the counter electromotive force coefficient. The invention further 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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