Abstract
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.
Highlights
Brushless DC motor (BLDC) rotor has permanent magnet poles which provides magnetic field
The back emf and stator voltage simulation results of BLDC motor with the Space Vector Pulse Width Modulation (PWM) (SVPWM) are shown in fig 9
The speed curve of simulation results of BLDC motor with the SVPWM is as shown in fig 13
Summary
Brushless DC motor (BLDC) rotor has permanent magnet poles which provides magnetic field. Because of non linear switching control of converter contains the harmonics and its cause to have torque ripple [3].The major disadvantages is torque ripple with that performance of applications are reduced. By using with hysteresis current control [1], non-ideal Back emf sensing [8], magnet segmentation, stator and rotor shape designs of Interior Permanent Magnetic. These methods are used to reduce the torque ripple content for the BLDC motor drive. These methods are best suitable for variable frequency drives (VFD).By the modulation technique Pulses are produced. The speed control scheme of BLDC motor with PWM technique with fuzzy controller is shown in fig.
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