An Efficient Single Stage PFC CUK Converter Based PMBLDC Motor Drive

The use of permanent-magnet brushless dc motor (BLDC) in low-power appliances is increasing because of its features of high efficiency, wide speed range, and low maintenance. This project deals with a power factor correction (PFC) based Cuk converter fed brushless DC motor (BLDC) drive as a cost effective solution for low power applications. The speed of the BLDC motor is controlled by varying the Dc bus voltage of voltage source inverter (VSI) which uses a low frequency switching of VSI (electronic commutation of BLDC motor) for low switching losses. A diode bridge rectifier (DBR) followed by a Cuk converter working in discontinuous conduction mode (DCM) is used for control DC link voltage with unity power factor at AC mains. Nowadays, PMBLDC has become more advantageous than induction motor. This rare earth PM not only improves the steady state performance of the motor but also its power density (output power to mass ratio), dynamic performance and also its quality. Also, the cost of rare earth permanent magnet also decreasing day by day hence is making these motors highly popular. Due to the improvement in the semiconductors field, the control of the brushless motor is easy with effective cost and also the drive is operated in wide speed ranges with good efficiency. In PMBLDC the power losses are at stator side, where the heat is easily transferred from the ribbed frame. Considerable improvement in dynamic performance of BLDC motor drive is achieved since low inertia at the rotor and due to air gap magnetic flux density is high and current limitations are speed independent.