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Direct torque control scheme for a six-phase induction motor with reduced torque ripple

Levi, E and Aware, MV and Pandit, JK and Nemade, R (2017) Direct torque control scheme for a six-phase induction motor with reduced torque ripple. IEEE Transactions on Power Electronics, 32 (9). pp. 7118-7129. ISSN 0885-8993

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Abstract

This paper presents an improved direct torque control (DTC) method for an asymmetrical six-phase induction motor using a two-level six-phase inverter. As is well-known, a simple extension of three-phase direct torque control technique to an asymmetrical six-phase motor, using large vectors only, introduces significant current harmonics of the order 6n±1 (n = 1,3,5,…), which are mapped into the non-flux/torque producing (xy) plane. These harmonics cause only losses in the motor winding as they do not take part in torque production. Hence a number of different improved DTC techniques have been developed in the past for multiphase motor drives. The paper takes one such DTC method as the starting point and improves it further by using the concept of virtual voltage vectors. Developed vector selection algorithm, based on two virtual voltage vectors, requires the information on position of the flux in the auxiliary (xy) subspace and provides stator current quality commensurate with the currently available best DTC algorithm for six-phase drives. However, use of two virtual voltage vectors enables a substantial reduction of the torque ripple, which is achieved by means of a five-level torque comparator. Extensive experimentation is performed and it is shown that the reduction of the current harmonics is in essence almost the same as in another recently developed DTC scheme, based on the use of a single virtual voltage vector. However, the achieved torque ripple reduction, which is verified experimentally, makes the scheme superior when compared to the existing approaches. At the same time, developed scheme retains qualities of conventional DTC schemes, such as simple structure and fast response. Its additional beneficial feature is the easiness of implementation.

Item Type: Article
Additional Information: (c) 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
Uncontrolled Keywords: 0906 Electrical And Electronic Engineering
Subjects: T Technology > TK Electrical engineering. Electronics. Nuclear engineering
Divisions: Electronics and Electrical Engineering
Publisher: Institute of Electrical and Electronics Engineers
Date Deposited: 02 Nov 2016 15:31
Last Modified: 06 Sep 2017 17:11
DOI or Identification number: 10.1109/TPEL.2016.2624149
URI: http://researchonline.ljmu.ac.uk/id/eprint/4731

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