Speed control of PMSM with Hall sensors using DSP TMS320F2812

In this paper, speed control of Permanent Magnet Synchronous Motor (PMSM), also known as sinusoidal BLDC motor, using Hall effect sensors is described. Normally, sensors like optical encoders or resolvers are necessary for applying sinusoidal commutation to such type of motor as they have more resolution. However, these sensors are costly and cannot be employed for low cost operations. The proposed approach for sinusoidal commutation uses rotor position information available from Hall sensors to apply sine PWM pulses for the inverter switching. The modulation index in this method is changed using PI controller for speed control of PMSM. The method has been tested successfully on a setup of 400W PMSM motor using Texas Instrument (TI) DSP controller TMS320F2812. Experimental results indicate that the motor drive developed in this paper exhibits satisfactory performance.