Self-correction starting method based on rotor position detection for brushless motor

Abstract

A self-correction starting method based on rotor position detection for a brushless motor by using a single Hall sensor to detect rotor position comprises the following steps of: reading initial voltage waveform detected by a rotor position sensor before the motor starts; setting a rotor position state variable as a first state or a second state according to a comparison result between the initial voltage waveform and a first threshold value; carrying out a maximum value detection process of the rotor position sensor if the rotor position state variable is the first state; carrying out a minimum value detection process if the rotor position state variable is the second state; and finishing the self-correction starting method if the maximum value detection process and the minimum value detection process of the rotor position sensor are completed.

Description

technical field [0001] The invention belongs to the field of brushless motor control, and in particular relates to a self-correcting starting method of a brushless motor based on detecting the position of a rotor by a single Hall sensor. Background technique [0002] In recent years, with the development of permanent magnet new materials, microelectronics technology, automatic control technology and power electronics technology, especially high-power switching devices, brushless motors have made great progress. Among them, the detection of the rotor position of the motor is correct and reliable, which plays a very critical role in shortening the starting time of the motor and increasing the success rate of starting the motor. [0003] However, due to the installation position of the sensor, the strength of the rotor magnetic field and the level of production technology all affect the detection accuracy of the rotor position, errors in the detection feedback signal are unavoi...

AI Technical Summary

Problems solved by technology

If it is determined that the initial position is wrong, the controller can automatically correct the phase of the rotor according to the phase of the input voltage, so as to drive the motor correctly, which solves the problem that the single-phase brushless motor cannot be started due to the wrong determination of the rotor position when starting in the prior art

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