Maria Shaju, Ginnes.K.John.
The objective of this paper is to describe about a low cost Brushless DC (BLDC) drive system without performance degradation. The cost of conventional drive systems are very high as BLDC motor is electronically commutated using 6 switch inverter and uses Hall sensors to detect rotor position. The low cost drive system is achieved by reducing number of switches in the inverter, use of single current sensor for current controlling and replacing hall sensors with position sensor-less control. The BLDC motor fed with Four Switch Three Phase (FSTP) inverter has 6 working modes. The proposed position sensorless scheme depends on back EMF zero crossing. Hysteresis current controller using single current sensor is used for current control and Proportional Integral (PI) controller is used for speed control. The performance of the drive system was verified using simulation results.
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