Simulation & comparison of various control strategies for BLDC motor and experimental analysis of BLDC motor using FPGA controller
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Date
2018-08
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
Brushless DC (BLDC) motor belongs to the class of special electrical machines. Brushless DC motors offer many attractive features like low maintenance, good fault tolerant properties, fast response, noiseless operation, high efficiency, high power density, good reliability and compact construction. As a result, the brushless DC motors are increasingly being used in military, industrial and commercial applications. Its market is rapidly expanding. Since the development of motor, problems were encountered for variable speed but in last decade the continuing technological development in power electronics, microprocessors, adjustable speed drivers, semiconductor chips, have combined to provide reliable and efficient operation at varying loads and varying speeds. In BLDC motors the speed of motor drops with load so the prime objective of closed loop control is to maintain the motor speed constant irrespective of load changes. So closed loop is necessary in applications that demands better control and constant speed. The speed of the motor is fed back and compared with the reference speed continuously. Performance of BLDC motor depends on two factors. The performance of BLDC motor depends on two factors one is design of BLDC motor and second is the control strategies. Various types of control strategies have been proposed in the past for studying the behaviour of the BLDC motor during normal and transient periods. This thesis comprises of two parts. First part deals with simulation and comparison of various control strategies with reference to speed, torque and current response under different loading conditions at different speeds. Simulations were performed in MATLAB/Simulink software. Simulation results concluded that at rated speed, fastest speed control was achieved with PWM control strategy. Second part deals with experimental analysis of BLDC motor using FPGA controller in order to gain better understanding of motor performance and drive system. FPGA controller provided gate pulse for inverter switches based on PWM technique. For experimental analysis 1 HP Out-runner type BLDC motor was run at different speeds under different load and corresponding stator voltages, currents, power factor were measured with the help of FLUKE power logger and efficiency was calculated. Highest efficiency of 88.75 % was achieved at rated speed of 1800 RPM.
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