Compensation method for position estimation of permanent magnet linear motor with high frequency injection method

Abstract

The invention discloses a compensation method for position estimation of a permanent magnet linear motor mover by a high-frequency injection method. The second compensation vector; the first compensation vector is multiplied by the first and second current signals respectively to obtain the first and second current vectors; the second current vector is low-pass filtered, and then made difference with the first current vector, and then compared with the first current vector Multiply the two compensation vectors to obtain the second current difference vector; the imaginary part of the second current difference vector is sent to the PI regulator for re-integration to obtain the estimated position of the mover; the estimated value of the angular frequency of the mover and the estimated value of the mover position As a feedback signal, the difference between the actual position of the motor mover and the estimated position of the mover is controlled to converge to zero, so that the motor runs stably. This method can significantly suppress the position estimation error caused by the end effect, effectively improve the accuracy of estimating the position of the linear motor mover by using the 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 ...

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