Compensation method for installation error of Hall sensor in permanent magnet synchronous motor

Abstract

The invention discloses a compensation method for the installation error of a Hall sensor in a permanent magnet synchronous motor. The method comprises the following steps: firstly, enabling the motor to be in a constant-speed operation state by adopting a constant-voltage frequency ratio control mode; then, dividing one period into six sectors according to six rotor positions detected by Hall sensors; calculating an absolute reference position through a controller, which is used for correcting the absolute deviation of the three Hall sensors; finding the compensation amount through the obtained absolute deviation, so that the actual position of the rotor is expressed; reflecting all information of the absolute error by selecting three continuous sectors, and expressing a complete absolute position deviation correction equation by establishing minimum variance estimation; and performing calculation according to the corresponding time detected by a timer of the controller to obtain a relative position deviation, and performing position compensation. Through the method, the harmonic content of the current can be reduced, the sine degree is better, the actual position of the rotor can be accurately obtained, and meanwhile the sine degree of the current can be improved.

Description

technical field [0001] The invention relates to the technical field of permanent magnet synchronous motors, in particular to a compensation method for installation errors of Hall sensors in permanent magnet synchronous motors. Background technique [0002] The permanent magnet synchronous motor control system has broadened many fields, and now it can realize motion control with high precision, fast response, high stability and high efficiency and energy saving. Hall sensors are divided into linear Hall sensors and are divided into linear Hall sensors and switch Hall sensors. The linear Hall sensor is composed of a Hall element, a linear amplifier and an emitter follower, and it outputs an analog value. The switch-type Hall sensor is composed of a voltage regulator, a Hall element, a differential amplifier, a Schmitt trigger and an output stage, which outputs digital quantities. [0003] When there is a deviation in the position of the Hall sensor in the permanent magnet sy...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for compensating the installation error of the hall sensor of the permanent magnet synchronous motor based on the least square method, so as to solve the situation that the permanent magnet synchronous motor has a deviation in the initial installation position of the hall position sensor in the prior art

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