HARDWARE OF FPGA BASED CONTROL OF BLDC DRIVE FOR MINIMUM TORQUE RIPPLE

Abstract

Brushless DC motors have a trapezoidal back emf waveform and are fed with rectangular stator currents. On these conditions the torque produced is,theoretically, constant. However, in practice, torque ripple may exist, due to the machine itself but also to the feeding system. The causes of ripple coming from the machine are cogging torque and emf waveform imperfections. In this paper we discusses on the torque ripples minimisation by average torque control technique. Fpga is used for switching the Bldc motor and control. Coding on FPGA is done using the software Xilinx. The simulation is done using MATLAB. This method is not designed to reduce the torque ripple caused by high speed switching.