Abstract
This paper investigates multiphase drives in which winding configuration (symmetrical or asymmetrical) can be easily obtained by only rearranging voltage source inverter (VSI) power supply cables at the machine’s terminal box. The type of the machines where this is possible is identified and the examples of reconfiguration are given and explained. Following from the examples (for nine- and fifteen-phase cases), a general reconfiguration algorithm is introduced. As shown, changing asymmetrical to symmetrical winding configuration (and vice versa) means that just another mimic diagram needs to be placed over the existing one on the machine’s terminal box. Possible reconfigurations of a six-phase machine, which do not follow the same pattern, are also addressed. Differences caused by different winding configuration are identified and experimentally confirmed using a nine-phase surface mounted permanent magnet synchronous machine (PMSM) and a nine-phase induction machine (IM).
Highlights
The advantages of multiphase machines over their threephase counterparts are nowadays well understood [1]–[3] and have led to their use in various transportation applications, as well as in power generation systems [2].With regard to the number of phases, multiphase machines with composite numbers of phases can be considered as a special category
Such machines are the most popular multiphase machines in real-world industrial applications since they provide modularity and their control is relatively related to the control of a three-phase machine
MULTIPHASE MACHINE WINDING ARRANGEMENTS AND CHANGE OF THE CONFIGURATION Regardless of the type of the machine, multiphase machines can be classified into two distinct groups: machines with a prime number of phases and machines with an even number or a composite odd number of phases
Summary
The advantages of multiphase machines over their threephase counterparts are nowadays well understood [1]–[3] and have led to their use in various transportation applications (e.g. high-speed elevators, more-electric planes, trains, ship propulsion [2]), as well as in power generation systems (for example, wind turbines) [2]. If the machine is with a composite odd phase number (e.g. nine-, fifteen-, etc.), winding configuration can be changed by only VSI power leads rearrangement in the machine’s terminal box. Such a possibility was briefly mentioned in [14] and restated in [11], but has never been explained in detail, generalised or experimentally verified. It appears that this knowledge, common to electric machine designers, has so far by and large escaped the attention of the drive control community As it will be shown here, changing asymmetrical to symmetrical winding configuration (and vice versa) means that just another mimic diagram needs to be placed over the existing one on the machine’s terminal box.
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