Zeta converter fed BLDC motor for Power Factor Correction and speed control

Abstract

In the recent years, usage of variable speed driving systems have been increasing in various applications like automobile industries, domestic appliances, etc., To save the energy consumption of a devices, there is a necessity in the usage of green and eco friendly electronics. It leads to the development of Permanent Magnet Brushless DC Motor (PMBLDCM). The improved power factor and closed loop speed control of PMBLDCM using closed loop Zeta converter are proposed in this project. In the proposed model, a closed loop zeta converter is used for active Power Factor Correction as well as for voltage regulation. It is having advantages of being naturally isolated structure, can operate as both step-up and step-down voltage converter and having a single stage processing for both voltage regulation and power factor correction. The wide range of speed control of PMBLDC motor is achieved by controlling the voltage of DC link capacitor of zeta converter. In this model, an active power factor correction is performed by using a zeta converter operating in Continuous Conduction Mode (CCM), where the inductor current must follow a sinusoidal voltage waveform. In addition to this, the sensorless scheme of feedback control is implemented in PMBLDC motor which reduces the usage of Hall position sensors. This method provides nearly unity power factor with low Total Harmonic Distortion (THD) and also the implemented scheme improves the power factor and wide range of speed control of Permanent Magnet Brushless DC (PMBLDC) motor.