scholarly journals Sensor less Speed Control for Permanent Magnet Motors with Non- Sinusoidal Back EMF

2019 ◽  
pp. 462-467
Author(s):  
C. Jayashankar ◽  
S. Gobinathan
Keyword(s):  
Permanent Magnet ◽  
High Reliability ◽  
Direct Torque Control ◽  
Torque Ripple ◽  
Dc Motor ◽  
Pi Controller ◽  
Low Noise ◽  
Torque Control ◽  
Brushless Dc Motor ◽  
Brushless Dc

Brushless DC motor has a rotor with permanent magnet and has no mechanical commutator which leads to many advantages like less maintenance, long life, high reliability, low inertia, low friction and low noise. Since the brush system/commutator assembly is replaced by an electronic controller which can be easily integrated into other required electronics, thereby improving the effective power to weight and power to volume ratio. In this paper the direct torque control method is employed to improve its torque ripple content which is been compared with conventional method by using MATLAB. In this project the three phase brushless DC motor model is designed with proportional integral controller and tested in MATLAB software. The PI controller is used to control the speed of the brushless DC motor. On the other hand parameters like Back EMF, current; speed and torque are evaluated for the designed models of BLDC motor. Due to the easy implementation and simple control structure the convectional PI controller are used in industries.

Direct Torque Control of Brushless DC Motor

2012 ◽  
Vol 591-593 ◽  
pp. 1651-1654
Author(s):  
Long Wu ◽  
Liu Yi Ling ◽  
Shuai Chen
Keyword(s):  
Control Strategy ◽  
High Efficiency ◽  
Direct Torque Control ◽  
Torque Ripple ◽  
Dc Motor ◽  
Pi Controller ◽  
Low Noise ◽  
Torque Control ◽  
Brushless Dc Motor ◽  
Brushless Dc

Due to the good performance of brushless motor, its application is widespread. Brushless DC motor has following advantages that are low interference, low noise, high efficiency and so on, so it was widely used in industrial and control field. But DC motor has larger current commutation torque ripple, greatly reduce their reliability and stability. This design using direct torque control strategy to reduce torque ripple, and compares the control results of PI controller with direct torque control method. In the process of regulating motor’s speed ，When adopts PI controller here has great overshoot and start time of speed is long than direct torque control, current pulse obviously severe than direct torque control. The simulation results show that overall effect of direct torque control is superior than double closed loop control. It fully explains that the control strategy in this paper is effective.

scholarly journals Torque Ripple Minimization in Direct Torque Control of Brushless DC Motor

2014 ◽  
Vol 9 (5) ◽  
pp. 1569-1576 ◽  
Author(s):  
Zhenguo Li ◽  
Songfa Zhang ◽  
Shenghai Zhou ◽  
Jin-Woo Ahn
Keyword(s):  
Direct Torque Control ◽  
Torque Ripple ◽  
Dc Motor ◽  
Torque Control ◽  
Brushless Dc Motor ◽  
Brushless Dc

scholarly journals A simple constant switching frequency of direct torque control of brushless DC motor

2019 ◽  
Vol 10 (1) ◽  
pp. 10
Author(s):  
Yusnida Ahmad Tarmizi ◽  
Auzani Jidin ◽  
Kasrul Abdul Karim ◽  
T. Sutikno
Keyword(s):  
Direct Torque Control ◽  
Torque Ripple ◽  
Dc Motor ◽  
Torque Control ◽  
Brushless Dc Motor ◽  
Switching Frequency ◽  
Triangular Waveform ◽  
Brushless Dc ◽  
Torque Response ◽  
Wide Range

This paper discusses about direct torque control of Brushless DC motor by injecting the triangular waveform and using PI controller in order to reduce the torque and obtain constant switching frequency. Brushless DC motor are widely used in applications which require wide range of speed and torque control because of robust, longer lifespan, faster torque response and able to operate at high speed.  Unlike conventional three phase DTC of induction machine (IM),the proposed DTC approach introduces two phase conduction mode. Besides that, the magnitude flux is considered constant in which the results only gains from constant torque region. Thus, the flux control loop is eliminated while implement this scheme. Using the triangular waveform that will be compare with actual torque, the proper switching pattern can be selected to control the generated torque and reducing commutation torque ripple. The torque response depends on the speed of the stator flux linkage which is directly controlled by selecting appropriate voltage space vectors from a look-up table to make sure the torque error within the band. The validity of the proposed control scheme for constant switching frequency and reduce torque ripple are verified through simulation and experimental results.

scholarly journals Power Factor Correction in Two Leg Inverter Fed BLDC Drive Using Cuk Dc-Dc Converter

2015 ◽  
Vol 6 (2) ◽  
pp. 196
Author(s):  
A. Purna Chandra Rao ◽  
Y.P. Obulesh ◽  
Ch. Sai Babu
Keyword(s):  
Power Factor ◽  
Power Factor Correction ◽  
High Reliability ◽  
Speed Control ◽  
Torque Ripple ◽  
Dc Motor ◽  
Brushless Dc Motor ◽  
Cuk Converter ◽  
Brushless Dc ◽  
Wide Range

Earlier for variable speed application conventional motors were used, but these motors have poor characteristics. These drawbacks were overcome by brushless Dc motor drive. Now days in most of the applications such as industrial, domestic, aerospace, defense, medical and traction etc, brushless DC motor (BLDCM) is popular for its high efficiency, high torque to weight ratio, small size, and high reliability, ease of control and low maintenance etc. BLDC motor is a electronic commutator driven drive i.e. it uses a three-phase voltage source inverter for its operation, electronic devices means there is a problem of poor power quality, more torque ripple and speed fluctuations. This paper deals with the CUK converter two leg inverter fed BLDCM drive in closed loop operation. The proposed control strategy on CUK converter two leg inverter fed BLDCM drive with split DC source is modeled and implemented using MATLAB / Simulink. The proposed method improves the efficiency of the drive system with Power factor correction feature in wide range of the speed control, less torque ripple and smooth speed control.

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