Sensorless direct torque control of five-phase interior permanent magnet motor drives

This paper presents the sensorless direct torque control (DTC) technique for five-phase interior permanent magnet (IPM) motors. By using the introduced technique fast torque response with low ripple in the stator flux and torque of the five-phase interior permanent magnet motor can be achieved. Having thirty-two space voltage vectors provides great flexibility in selecting the inverter switching states. Therefore, the stator flux and torque can be more precisely adjusted. Position information and speed are being estimated based on the position of the stator flux linkages. The mathematical model of the five-phase interior permanent magnet motor is first derived. Later, the speed sensorless direct torque control method of the five-phase IPM is introduced. A five phase interior permanent magnet motor and five leg IGBT based inverter were designed and fabricated in the laboratory. The control method is implemented on a TMS320C32 digital signal processor board.