Redundant switching state based DTC for six‐phase symmetrical induction motor driven by nine‐switch inverter

Abstract

This paper presents the implementation of direct torque control (DTC) algorithm on the symmetrical six-phase (0°d isplaced) induction motor supplied by nine-switch inverter (NSI). This configuration provides the better dc bus utilisation in comparison to symmetrical 60° displaced and asymmetrical six-phase induction motor. In the conventional topology, 12-switch two-level inverter is required to control the drive where total 64 switching states are available. In the proposed system, NSI is used to drive the motor which is having 27 switching states. The DTC algorithm is proposed with five-level torque comparator by using large, small and zero voltage vectors for reduction in torque ripples. The elimination of xy-subspace flux without affecting the merits of conventional DTC is achieved by using redundant switching states of the inverter. The experimental results under steady-and dynamic-state operation are provided with DTC algorithm on 0° displaced symmetrical six-phase motor supplied by NSI to validate the effective controlling.

Saturated PI Optimization Induction Motor with Integral

“…Due to the advantages of simple structure and stable performance, induction motors are widely used in industrial production, which occupy more than 60% of the market share in factories, industrial departments, air compressors, fans, household appliances and automobile applications [1] . Induction motor types vary in different applications according to the demand of the motor phase number and motor control mode, motor phase number considering the capacity demand including single-phase [2] , three-phase, five-phase [3] , six-phase [4,5] , seven-phase, etc.…”

Two‐stage DSVM‐based torque ripple minimisation technique for the predictive torque control of the induction motor

“…A popular control method used in AC drives is Direct Torque Control (DTC) [3]. Considering the fast dynamic of the induction machine stator flux, DTC directly controls this variable by selecting appropriate switching states, so that the favourable torque is achieved.…”