Current Control Methods for an Asymmetrical Six-Phase Induction Motor Drive

Abstract

Abstract-Using the vector space decomposition (VSD) approach, the currents in a multiphase machine with distributed winding can be decoupled into the flux and torque producing α-β components, and the loss-producing x-y and zero-sequence components. While the control of α-β currents is crucial for flux and torque regulation, control of x-y currents is important for machine/converter asymmetry and dead-time effect compensation. In this paper, an attempt is made to provide a physically meaningful insight into current control of a six-phase machine, by showing that the fictitious x-y currents can be physically interpreted as the circulating currents between the two three-phase windings. Using this interpretation, the characteristics of x-y currents due to the machine/converter asymmetry can be analysed. The use of different types of x-y current controllers for asymmetry compensation and suppression of dead time induced harmonics is then discussed. Experimental results are provided throughout the paper, to underpin the theoretical considerations, using tests on a prototype asymmetrical six-phase induction machine.

Comparison of two-individual current control and vector space decomposition control for dual three-phase PMSM

“…1 [10], where the machine has two sets of three-phase windings, one set is designated as ABC, and the other set is XYZ shifted by 30° electrical degrees. Numerous current control strategies have been developed for the dual three-phase drive system [4][5][6][7][11][12][13][14][15][16][17][18]. Two of the most interesting and widely used strategies are the vector space decomposition (VSD) control [11,13,16,17], which treats the machine as a six-phase machine, and the twoindividual current control [4,5,7,12], which treats the machine as two single three-phase machines.…”

Modelling approaches for triple three-phase permanent magnet machines

“…Following the VSD theory, work in [16] demonstrates that the fundamental frequency components in the currents in the non-flux/torque producing subspaces can create current imbalances between the different three-phase systems in the machine. This can be used to operate the three-phase systems with different load sharing as desired.…”

Control and Performance Evaluation of Multiphase FSPM Motor in Low-Speed Region for Hybrid Electric Vehicles

“…The main current control technique presented for FSPM motors in the literature is hysteresis control [14,15], which provides a fast and simple solution for multiphase FSPM motor drives, but it uses variable switching frequency that results in unbalanced operation. In addition, the vector space decomposition (VSD) method in multiphase induction motors (IM) and PM synchronous motors (PMSM) is a known conventional method [16][17][18]. However, the operating principles and structure of FSPM motors are different from traditional IM and PMSM.…”