Research on Circuit Design for Speed Adjusting Hardware of Brushless DC Motor Based on the Two-Dimensional Fuzzy Controller

2013 ◽  
Vol 705 ◽  
pp. 509-515
Author(s):  
Chun Feng Li ◽  
Ke Ming Li ◽  
Xiang Zhang

The essay first establishes the general design for intelligent rotary speed system of the brushless DC motors, then based on the general design scheme, two-dimensional fuzzy controller, adaptive current adjustor and mainly used hardware circuits are designed. The mainly used hardware circuit design includes the circuit design of current detecting circuit, voltage detecting circuit, high-speed optocoupler, motor driver circuit, zero-crossing comparator circuit, etc. At last the designed controller and hardware circuits are tested to achieve optimum effects for rotary speed control through validation of experimental devices.

2011 ◽  
Vol 383-390 ◽  
pp. 4424-4431
Author(s):  
Chang Chun Chen ◽  
Jia Dan Wei ◽  
Bo Zhou ◽  
Guo Sheng Li

Zero crossing points of Back-Electromotive force (EMF) is the most mature and widely used method of the speed sensorless control of brushless DC motor (BLDCM). However, with the poor performance from standstill to low speed, it is not suitable for the position servo system. Therefore, this paper first analyzes several conventional speed sensorless control schemes in the BLDCM, then presents a novel control algorithms for the BLDCM. In the proposed method, the short pulse sensing method for the rotor position in the Start-Up process and self-synchronization with zero cross points of back-EMF are combined together. As a result, the BLDCM used in the position servo system can be easily controlled from zero to high speed, the theoretical analysis is verified by the simulation results based on Matlab, it shows that the proposed algorithms can improve the performances of position servo system compared with the conventional methods.


2018 ◽  
Vol 7 (4.24) ◽  
pp. 71
Author(s):  
Ch.N. Narasimha Rao ◽  
G. Durga Sukumar ◽  
R. Vinod Kumar

Brushless DC motors have the large applications because of its easiest control system and the highest efficiency. Industrial BLDC motor drives suffers from the ripples in the torque, due to which motor has more noise, vibrations and less efficient. To reduce the ripple, the Space Vector PWM (SVPWM) and Sinusoidal PWM are implemented in BLDC drive. The Pulse Width Modulation (PWM) controls the converter output voltage and frequency. Space Vector PWM (SVPWM)and Sinusoidal PWM are the best techniques used in industries because its easy design. Space Vector PWM control method is implemented and it overcomes the disadvantages in PWM such as losses in switching of the converter, output harmonic content& provides better DC-bus voltages. The torque ripples are also reduced in SVPWM method compared to SPWM method. In this paper BLDC motor with a fuzzy controller is presented and the comparison in performance of SVPWM &SPWM methods presented. The SVPWM makes the drive has less ripple in torque& noiseless operation. The Matlab/Simulink models of SVPWM and SPWM method with fuzzy controlled BLDC motor also presented.


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