Position Detection Methods of Position Sensor-Less Brushless DC Motor

2011 ◽  
Vol 179-180 ◽  
pp. 707-712
Author(s):  
Hua Ji ◽  
Zhen Yun Han ◽  
Hong Li Liu
Keyword(s):  
High Speed ◽  
Control Method ◽  
Dc Motor ◽  
Detection Methods ◽  
Brushless Dc Motor ◽  
Position Sensor ◽  
Less Is More ◽  
Rotor Position ◽  
Brushless Dc ◽  
Position Detection

With the widely use of Permanent Magnet Brushless DC Motor (BLDCM) in many fields, the superiority in the control method of position sensor-less is more and more obvious. In this paper several control methods of position sensor-less for BLDCM are presents, and a novel technique, the method of speed-independent position function, is introduced to detect the rotor position of BLDCM. This method may detect the rotor position from almost zero speed to high speed, and may also give the commutation time.

Back-EMF Position Detection Technology for Brushless DC Motor

2014 ◽  
Vol 492 ◽  
pp. 49-55
Author(s):  
Hong Xing Wu ◽  
Zhi Yuang Qi ◽  
Ji Gui Zheng ◽  
Shou Ming Zhou
Keyword(s):  
Digital Signal Processor ◽  
Digital Signal ◽  
Dc Motor ◽  
Brushless Dc Motor ◽  
Position Sensor ◽  
Brushless Dc ◽  
Starting Position ◽  
Position Detection ◽  
Detection Technology ◽  
Sensor Control

Without position sensor control technology of brushless DC motor has become the focus of many experts and scholars at home and abroad. The article presented research of without speed and position sensor control for brushless DC motor, including brushless DC motor mathematical model, Back-EMF detection principle and starting position detection method, and designed a hardware control system based dedicated digital signal processor (DSP). For experimental study of the system based experimental prototype had shown: this method can achieve no load starting, load starting and load operation of without position sensor brushless DC motor.

Rotor Position Phase Correction for Sensorless Brushless DC Motor Based on Line Back EMF

2011 ◽  
Vol 347-353 ◽  
pp. 607-610 ◽  
Author(s):  
Zi Cheng Li ◽  
Zi Yu Ou ◽  
Shan Mei Cheng
Keyword(s):  
Control Method ◽  
Phase Error ◽  
Estimation Method ◽  
Dc Motor ◽  
Position Estimation ◽  
Brushless Dc Motor ◽  
Loop Control ◽  
Rotor Position ◽  
Brushless Dc ◽  
On Line

This paper proposes a novel rotor position estimation method based on line back EMF for brushless DC motor (BLDCM). The relationship between position phase error and the symmetric line back EMF is analyzed. It is noted that line back EMF error can exactly reflect rotor position phase error. If the amplitude of line back EMF at the beginning of commutation is equal to the amplitude of line back EMF at the end of commutation, the waveform of line back EMF should be symmetric. Based on the above analysis, a closed loop control method to correct rotor position phase is presented. Line back EMF error is employed to keep the waveform of line back EMF symmetrical by PI controller. This paper also develops a sensorless BLDCM driver to implement the proposed method based on DSP and the experimental results prove the validity of the proposed method.

A Composite Approach of Sensorless Rotor Position Sensing for Brushless DC Motor

2011 ◽  
Vol 230-232 ◽  
pp. 877-883
Author(s):  
Qing Shan Ji ◽  
Hong Yan Hao
Keyword(s):  
Detection Method ◽  
Dc Motor ◽  
Test Method ◽  
Inductive Method ◽  
Brushless Dc Motor ◽  
Third Harmonic ◽  
Position Sensing ◽  
Rotor Position ◽  
Brushless Dc ◽  
Position Detection

The principles and characteristics of the sensorless brushless DC motor rotor position detection were analyzed by using inductive method and third harmonic back-EMF detection method. A composite rotor position detection method was proposed in full speed range (including zero speed). At zero speed (static state) inductive method was used to determine the initial rotor position, and it was bases of starting and controlling for the brushless DC motor; at low speed third harmonic back EMF detection method was used. Analysis shows that the composite test method can estimate the rotor position, and it is to achieve the position sensorless brushless DC motor to run a viable method.

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