DC-bus utilisation in series-connected multi-phase machines supplied from a VSI with a composite phase number

Multiphase series-connected motor drives can be supplied from a two-level voltage source inverter (VSI), which has either a prime or a composite number of legs (phases). It has been shown recently that, in the case of a prime number of inverter/machine phases, limits of the linear PWM region get extended over those valid for a particular phase number due to the phase transposition applied in the series connection. A study of the dc bus voltage utilisation in the linear modulation region is reported in this paper for series-connected multiphase drives with a composite phase number. The limits are independent of the actual PWM technique used and are equally applicable to both carrier-based and space vector PWM techniques. A detailed simulation and experimental investigation is conducted using a symmetrical six-phase VSI, which supplies series connection of a symmetrical six-phase and a three-phase machine. The results thus obtained fully verify theoretical considerations.

Published in:
The XIX International Conference on Electrical Machines - ICEM 2010, 1-6
Presented at:
2010 XIX International Conference on Electrical Machines (ICEM), Rome, Italy, 6-8 09 2010

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 Record created 2014-04-10, last modified 2018-03-17

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