Improved DB-DTFC System for the Segmented Outer-stator Consequent-Pole Permanent Magnet Motor with a Closed-loop Current Observer

This paper proposes a new deadbeat direct torque control system for a Segmented Outer-stator Consequent-Pole Permanent Magnet(SOCPPM) motor, to solve the problem of one beat delay in digital implementation of full speed domain control algorithms. Compared with the traditional DTC and SVPWM-DTC systems, it is based on deadbeat direct torque and flux control (DB-DTFC) to reduce torque and flux ripple and improve stability. Then, a closed-loop current observer is proposed to eliminate one beat delay in next control system. Simulation is built up to verify the accuracy of the current observer and to validate the system performance. The results demonstrate the advantages of the new DB-DTFC system.