A THREE PHASE SENSOR LESS FIELD ORIENTED CONTROL FOR BLDC MOTOR

Abstract

This paper presents a three phase sensor less field oriented control for BLDC motor. The proposed sensor
less control technique gives the simple and high-performance motor drive. With In addition maximum torque per ampere
block is implemented to optimize torque generation efficiency without power factor angle calculation. The space vector
modulation (SVPWM) of Brushless DC motor (BLDC) is different from that of permanent magnet synchronous motor for
its turn-off phase and trapezoidal back electromotive force. To overcome these problems, a SVPWM method is presented
in this paper. The application of SVPWM to Brushless AC drives has been investigated extensively. This paper describes
its application to BLDC drives and highlights the essential differences in its implementation, as regards torque
estimation and the representation of the inverter voltage space vectors, this makes more robust against disturbances.
This proposed technique is more preferred for small and medium rating applications. This technique is ideal for
applications which require good performance over the wide operating speed rages. It also presents robustness to
parameters variation causes by temperature or flux. This paper discusses the theoretical analysis along with simulation
results.