Authors : A. Sundaram and G.P. Ramesh
Abstract: In vector controlled drives speed or position sensor results in added cost and mounting sensors in motor case adds to mechanical complexity, motor vibration increases noise in sensing speed additional electronic circuits required. This study presents a speed sensor less control of BLDC motor drive fed from switched inductor quasi Z-source inverter powered from a photovoltaic source. A simplified Indirect Field Oriented Control (IFOC) is implemented in this drive for accurate speed control and minimizing torque ripple of BLDC motor. In this scheme, back-EMF estimation method is used for speed estimation in speed sensor less approach, implemented speed estimation method found to track speed changes continuously even with respect to varying load and system parameters. The estimated speed is used to originate rotor position and hall commutation signals are estimated from rotor angle since BLDC motor is an electronically commutated motor. The proposed speed sensor less scheme is simulated using MATLAB/simulink environment in order to verify the performance of drive. With minimum torque ripple and by operating at low voltage proposed drive exhibit high efficiency at low cost. A 24 V switched inductor quasi Z-source PV inverter fed BLDC drive is developed in hardware for experimental verification of proposed scheme.
A. Sundaram and G.P. Ramesh, 2017. A Low Cost BLDC Motor Drive with Sensor Less Speed Estimation and Minimum Torque Ripple Powered from Photo-Voltaic Source Fed SL-QZS Inverter. Journal of Engineering and Applied Sciences, 12: 5854-5862.