Abstract:
A new bridgeless Cuk PFC converter driving a permanent magnet brushless DC motor drive is proposed here. In the case of a conventional BLDCM drive system there will be a rectifier and a PFC converter connected to the drive through a voltage source inverter. In this project it is replaced by a bridgeless PFC Cuk converter and the voltage source inverter connected to the PMBLDCMD. This improves the efficiency of the drive as well as maintains a unity power factor. This is because of the bridgeless topology introduced which does not have an input diode bridge rectifier. That is there will be less number of semiconductor switches in the current flowing path. The bridgeless Cuk converter is designed to work in discontinuous conduction mode. The proposed PMBLDM drive is designed with necessary controls and modeled in MATLAB Simulink and simulated results are presented. Also a comparison is made between proposed drive system and the conventional Cuk rectifier fed PMBLDCM drive.

Keywords: Cuk converter, Power factor correction (PFC), Bridgeless Cuk converter, low conduction losses, total harmonic distortion, permanent magnet brushless DC motor (PMBLDCM)