A Simulation For The Motor Of A Bldc Motor Drive With The Estimation Of Initial Rotor Position

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This paper presents a simulation for the sensorless operation of a BLDC motor drive with the estimation of initial rotor position at standstill. The system determines the actual rotor position of the motor at standstill and provides appropriate starting pulses to inverter switches to turn on. Once the motor starts to rotate, it then directly extracts the back EMF from the motor terminals between the floating phase and the midpoint of DC link. Inductance variation sensing method is used for estimating the initial rotor position of the motor followed by a sensorless operation by back EMF sensing method. The principle behind the rotor position estimation is detection and comparison of phase voltage and dc link current responses and relating it with stator inductances. The most advantage is that it requires only three voltage pulse injections of small duration for the estimation of rotor position. A resolution of 30o can be achieved. The effectiveness of the method is validated by simulation results in Matlab Simulink platform. Keywords— Brushless DC(BLDC), saturation, rotor position, voltage pulse injection. I. INTRODUCTION ndustrial application of brushless DC motors (BLDC), is being increased day by day because of their outstanding features like high starting torque, high efficiency, no excitation losses, silent operation and durability finding applications such as compressor, in electrical vehicles, hard disc drives. An inverter driven three-phase BLDC motor, as shown in

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