Direct torque control (DTC) of interior permanent magnet synchronous motor (IPMSM) with and without speed/position sensors

This paper aims at the following control schemes of the IPM-SM drive, (i) A closed-loop direct torque control of an IPM-SM for variable speed drive with speed/position sensor, (ii) A speed and position sensor-less direct torque control scheme of the IPM-SM drive. To achieve closed loop control of torque and stator flux linkage, two PI controllers has been used; whereas to generate reference voltage vectors, a space vector modulation (SVM) technique has been used. In sensor-less scheme, the speed and position estimation is achieved by using an approach based upon stator flux linkage and the torque angle.