Isolated Zeta Converter for BLDC Motor Control with Hysterises Current Controller for Torque Ripple Minimization

Abstract

This paper presents a brushless dc (BLDC) motor drive with power factor correction (PFC) for low-power applications. In this the speed of the BLDC motor is controlled by adjusting the dc link voltage of the voltage source inverter (VSI) feeding a BLDC motor. Therefore, VSI is used for achieving only an electronic commutation of the BLDC motor and operates in a low frequency switching for reduced switching losses. A PFC based isolated zeta converter operating in discontinuous conduction mode (DCM) is used for controlling the dc link voltage of the VSI with inherent PFC at ac mains using single voltage sensor. The proposed drive is implemented to achieve a unity power factor at ac mains for a wide range of speed control and supply voltage fluctuations.

Methods/analysis: According to the reference values we give to the zeta converter, Operation of zeta converter has two modes of conduction mode. Continuous and discontinuous conduction modes. In order to minimize the torque ripples most methods are complicated and do not consider the stator flux linkage control, therefore, possible high-speed operations are not feasible. In this project a simple approach to achieve a low frequency torque ripple-free direct control with maximum efficiency is presented. Simulation results are presented using MATLAB software.