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Abstract: The area of multiphase variable-speed motor drives in general and multiphase induction motor drives in particular has experienced a substantial growth since the beginning of this century. Research has been conducted worldwide and numerous interesting developments have been reported in the literature. An attempt is made to provide a detailed overview of the current state-of-the-art in this area. The elaborated aspects include advantages of multiphase induction machines, modelling of multiphase induction machines, basic vector control and direct torque control schemes and PWM control of multiphase voltage source inverters. The authors also provide a detailed survey of the control strategies for five-phase and asymmetrical six-phase induction motor drives, as well as an overview of the approaches to the design of fault tolerant strategies for post-fault drive operation, and a discussion of multiphase multi-motor drives with single inverter supply. Experimental results, collected from various multiphase induction motor drive laboratory rigs, are also included to facilitate the understanding of the drive operation.
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1 Introduction
The first record of a multiphase motor drive, known to the authors, dates back to 1969, when a five-phase voltage source inverter-fed induction motor drive was proposed [1], During the next 20 years multiphase motor drives have attracted a steady but rather limited attention. The pace started accelerating during the 1990s, but it was not until the beginning of this century that the multiphase motor drives have become a focus of a substantial worldwide attention within the drives research community. This has predominantly resulted from developments in three very specific application areas, namely electric ship propulsion, traction (including electric and hybrid electric vehicles) and the concept of 'more-electric' aircraft. Although the specific reasons for looking at a multiphase motor drive utilisation in these application areas vary to a large extent (as does the specific ac motor type and the power electronic converter topology), the common feature is that utilisation of multiphase motor drives is perceived as offering important advantages when compared to the use of their three-phase counterparts.
The net result of the rapid pace of development in multi-phase motor drive area during the last five to six years is that a substantial body of work has been published, rendering the only two available survey papers...