Compensation method for position estimation of permanent magnet linear motor rotor by high-frequency injection method

Abstract

The invention discloses a compensation method for position estimation of a rotor of a permanent magnet linear motor by a high-frequency injection method, which comprises the following steps of: filtering a current response signal to obtain a first current signal and a second current signal, and designing a first compensation vector and a second compensation vector according to included position estimation error information; multiplying the first compensation vector by the first current signal and the second current signal respectively to obtain a first current vector and a second current vector; carrying out low-pass filtering on the second current vector, subtracting the second current vector from the first current vector, and multiplying the second current vector by the second compensation vector to obtain a second current difference vector; sending the imaginary part of the second current difference vector to a PI regulator for integration to obtain a mover estimation position; andtaking the mover angular frequency estimated value and the mover position estimated value as feedback signals, and controlling the difference between the actual position of the motor mover and the mover estimated position to converge to zero, so that the motor operates stably. The method can obviously inhibit the position estimation error caused by the end effect, effectively improves the precision of estimating the position of the linear motor rotor by adopting a high-frequency injection method, and is simple and easy to implement.

Description

technical field [0001] The invention belongs to the field of linear motors, in particular to a compensation method for estimating the position of a mover of a permanent magnet linear motor with a high-frequency injection method. Background technique [0002] With the development of industrial applications, linear motors are widely used in production lines, intelligent elevators, maglev trains, and other high-speed, high-precision control devices. In the case of linear drive, compared with rotary motors, linear motors have simple structure, small inertia, fast response speed, can directly generate linear thrust, high efficiency and low construction cost. [0003] In order to realize the high-performance linear motor control, it is necessary to obtain the position and speed information of the linear motor. If you refer to the installation method of the speed sensor of the rotating motor, the speed sensor of the linear motor needs to lay a grating scale along the linear track ...

AI Technical Summary

Problems solved by technology

[0006] The position sensorless compensation algorithms of these rotating motors can be transplanted to the position sensorless control of permanent magnet linear motors to compensate the position estimation error, but the position estimation error caused by the asymmetry of the three-phase mutual inductance parameters of the linear motor is a function of angle, which is Cannot be eliminated by the adjustment of the controller

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