Hall position sensor-based position estimation and compensation method for permanent magnet synchronous motor

Abstract

The invention relates to a three-phase sinusoidal voltage control driving system for a permanent magnet synchronous motor, in particular to a Hall position sensor-based position estimation and compensation method for the permanent magnet synchronous motor. The method comprises the following steps of: driving the permanent magnet synchronous motor to rotate at constant speed in a VVVF manner by a controller, and detecting a position signal transmitted back by a Hall sensor to obtain the distribution proportion of six position intervals under an electrical angle of 360 degrees; obtaining a position interval with a calculation number i according to the distribution proportion, and estimating a correction coefficient V[i] of an angle change value; and correcting T in an angle estimation formula 60*t / T to finally obtain a corrected angle estimation formula 60*t / (V[i]*T), wherein i is the number of the position interval, and V[i]*T in the corrected angle estimation formula is time actually required by the rotation of the motor by the position interval with the number i. A position angle change value calculated according to the formula in the interval always changes linearly within 0 to 60 degrees regardless of an electrical angle actually corresponding to the position interval.

Description

technical field [0001] The invention relates to a three-phase sinusoidal voltage control drive system of a permanent magnet synchronous motor, in particular to a method for estimating and compensating the position of the permanent magnet synchronous motor based on a Hall position sensor. Background technique [0002] With the development of motor technology, the application range of permanent magnet synchronous motors is becoming wider and wider. Due to its low power consumption and low noise characteristics, permanent magnet synchronous motors are used in various household appliances to replace previous induction motors, such as refrigerators, air conditioner compressors, blowers, etc. In addition, most of the latest electric vehicles also use permanent magnet synchronous motors. A high-power permanent magnet synchronous motor is used as its driving motor. [0003] The permanent magnet synchronous motor is a three-phase AC motor in which the rotor is a permanent magnet and...

AI Technical Summary

Problems solved by technology

[0013] In order to solve the technical problem of the existing permanent magnet synchronous motor control, the position estimation algorithm is affected by the installation accuracy of the Hall position sensor and the symmetry of the magnetic pole of the rotor magnetic steel. A new method based on the Hall position sensor is proposed. The permanent magnet synchronous motor position estimation compensation method, which can correct the time T in the formula 60*t / T according to the actual width of the current position interval, so as to ensure that the estimated position angle is consistent and continuous, and there will be no jumps Variable or steps, greatly reducing the three-phase sinusoidal voltage waveform distortion, reducing torque ripple and noise

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