Design of Speed Control and Reduction of Torque Ripple Factor in BLdc Motor Using Spider Based Controller

It is a very difficult process to achieve smooth drivers for the motor operating under variable speed mode. In brushless direct current motor (BLdc) when back electromotive force waveform is of trapezoidal type, the developed torque is constant in ideal conditions. However, practically, torque ripple is present in the output torque because of the physical design of the motor and its parameters. Also, the produced ripples are associated with the control and driver side of the motor. In the previous literature, the drive without a dc-link capacitor is presented but the torque ripple reduction is not effective. Hence in another work, the usage of the small capacitor is recommended and the results are improved. In this work, the quick stabilization with torque ripple reduction is presented using a bio-inspired algorithm-based technique in a BLdc motor drive. A Spider based controller is built to generate the pulsewidth modulation signals applied to the inverter and the control signal applied to the capacitor. The effect of utilizing small dc-link capacitor, on the torque ripple reduction and speed control is investigated. The performance is also compared with the case of large capacitor utilization and without a capacitor case. The proposed control strategy is verified experimentally by implementing with dsPIC30F4011 and the hardware circuit.