Brushless direct-current motor position detection method independent of rotating speed

Abstract

The invention provides a brushless direct-current motor sensorless control position detection method independent of the rotating speed for the limitation existing in a traditional brushless direct-current motor sensorless counter electric potential detection method especially for the problem that the traditional brushless direct-current motor sensorless counter electric potential detection method is difficult to achieve when a motor is at a low speed. The method is achieved on the basis of a magnetic flux linkage function independent of the rotating speed, the position of a rotor can be detected when the rotating speed of a motor reaches a high value from a value close to zero, phase change signals can be given, and the speed adjusting range of sensorless operation is widened. According to the method, only three terminal voltages and the bus current of the motor need to be detected, the principle is clear, and the method is easy to achieve.

Description

technical field [0001] The invention belongs to the field of motor control, and specifically relates to a position detection method for a brushless DC motor without position sensor control, which is an innovation of the position sensor-less control technology. Background technique [0002] Brushless DC motor is a new type of electromechanical integration motor. It not only has simple structure, reliable operation, and convenient maintenance, but also has the advantages of large starting torque, high efficiency, long life, and good speed regulation performance. It is widely used in aerospace, medical, computer, etc. , household appliances and other fields have been widely used. Brushless DC motors are divided into two methods: position sensor control and position sensorless control. It is easy to realize the position sensor control, but the existence of the position sensor limits the application range of the motor. Therefore, how to realize high-performance control without ...

AI Technical Summary

Problems solved by technology

Since the back EMF is directly proportional to the speed, there is a fatal shortcoming in the detection of back EMF: when the speed is very low, the back EMF is very small or even close to zero, and the zero crossing point of the motor cannot be obtained by detecting the back EMF, which limits the speed range of the motor and application

These algorithms have certain application value, but it is still difficult to realize technically.

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