scholarly journals On Stability of Open-Loop Operation without Rotor Information for Brushless DC Motors

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Zhong Wu ◽  
Haotun Lyu ◽  
Yongli Shi ◽  
Di Shi
Keyword(s):  
Theoretical Analysis ◽  
Operation Mode ◽  
Open Loop ◽  
Control Mode ◽  
Open Loop Control ◽  
Brushless Dc Motors ◽  
Loop Control ◽  
Rotor Position ◽  
Brushless Dc ◽  
Dc Motors

Open-loop operation mode is often used to control the Brushless DC Motors (BLDCMs) without rotor position sensors when the back electromotive force (EMF) is too weak due to the very low rotor velocity. The rotor position information is not necessary in this mode and the stator windings are supplied with voltages under a certain ratio of the amplitude to the frequency. However, the rotor synchronization will be destroyed once if the commutation instant is inappropriate. In order to improve the reliability of the open-loop operation mode, a dynamic equation is established to represent the synchronization error between the rotor and the stator. Thereafter, the stability of the open-loop control mode is analyzed by using Lyapunov indirect method. Theoretical analysis indicates that the open-loop control mode is asymptotically stable only when the commutation instant of the stator current lags behind the ideal one suitably. Finally, theoretical analysis is verified through the experimental results of a certain BLDCM.

scholarly journals Speed Control of BLDC Motor using Open Loop, PID Controller and Neural Network

2019 ◽  
Vol 9 (1) ◽  
pp. 2210-2213
Keyword(s):  
Neural Network ◽  
Simulation Study ◽  
Pid Controller ◽  
Speed Control ◽  
Open Loop ◽  
Bldc Motor ◽  
Variable Speed ◽  
Brushless Dc Motors ◽  
Brushless Dc ◽  
Dc Motors

is main goal of upcoming and present applications. However, its possible to achive these aims using brushless DC motors (BLDC), due to its use in many applications. The applications such as sppining, drilling, elevators, lathes, etc can be exicuted using BLDC motor and can replace conventional DC brush motor. The effective vechiel control required for applications of variable speed can be achived using BLDC motors. This paper presents speed control of BLDC motor for open loop using PID and neural network techniques and their comparative study. From the simulation study it is observed that neural network gives better performance compaiered to other technique.

scholarly journals Initial Rotor Position Detection for Brushless DC Motors Based on Coupling Injection of High-Frequency Signal

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 133433-133441 ◽  
Author(s):  
Wei Chen ◽  
Shuhai Dong ◽  
Xinmin Li ◽  
Yanfei Cao ◽  
Guozheng Zhang
Keyword(s):  
High Frequency ◽  
Frequency Signal ◽  
High Frequency Signal ◽  
Brushless Dc Motors ◽  
Rotor Position ◽  
Brushless Dc ◽  
Dc Motors ◽  
Position Detection

An Initial Positioning Method on Magnetic Rotary Encoder Applying to PMSM

2014 ◽  
Vol 687-691 ◽  
pp. 201-205
Author(s):  
Lei Liu ◽  
Chen Hu Yuan ◽  
Qiang Lin Zeng ◽  
Jian Ming Wang
Keyword(s):  
Position Angle ◽  
Open Loop ◽  
Absolute Difference ◽  
Open Loop Control ◽  
Loop Control ◽  
Rotary Encoder ◽  
Rotor Position ◽  
Loop Control System ◽  
Positioning Method ◽  
Rotor Angle

Magnetic rotary encoder can be used to detect the rotor position of PMSM, in order to realize vector control of PMSM. An initial positioning method on magnetic rotary encoder based on open loop control system was presented to calculate absolute difference of average through setting Rotor position angle on multi point.Experimental results show that the method was simple and suitable to measure rotor angle exactly and easily.

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