Comparative Review Of PMSM And BLDCM Based On Direct Torque Control Method

Abstract The direct torque control theory has achieved great success in the control of BLDC motor and PMS Motor. Many researches was carried out to apply the idea of DTC of BLDCM to PMSM since 1990s.The DTC is applied by choosing the appropriate voltage vector based on the switching status of inverter which was determined by the error signals of reference flux linkage and torque with their measured real value acquired by calculating in the stationary reference frame by means of simply detecting the motor voltage or currents. Aiming at the DTC in PMSM Drives this research presents the theoretical basis of the DTC for PMSM firstly. Then the difference between the application of DTC to PMSM and to BLDCM their model on the rotor reference frame with their respective motor equations was explained and presented.