Symmetrical/Asymmetrical Winding Reconfiguration in Multiphase Machines

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).

Modeling and analysis of novel six‐phase DFIG through asymmetrical winding structure for disperse generation

“…F I G U R E 3 ASPDFIG winding arrangements; A, spatial reparation with six stator windings; B, phasor representation whereas the voltages, currents and flux linkages matrix of stator windings and rotor windings are given by Equations (3)- (5) and Equations (8)-(10), respectively. The resistance matrices in Equations (1) and 6…”

“…1 Furthermore, when three phase induction machines are interfaced with conventional multi-step inverter then the pulsating component of torque are appearing in the machine and due to this pulsating torque, the vibrations are appearing in to machine. 2,3 The generators are widely utilized by renewable power industries for wind energy generation system (WEGS) and for establishing continuous power production using DFIG during the faults, the main requirements 4,5 for the DFIG system include the following:…”

“…The generators are widely utilized by renewable power industries for wind energy generation system (WEGS) and for establishing continuous power production using DFIG during the faults, the main requirements 4,5 for the DFIG system include the following: High Reliability: The reliability of the generator should be high. With the help of a reliable DFIG system, the interruption due to fault can be mitigated. Fast response: The response of the machine should be as fast as possible by keeping minimum plant down time. Lower pulsating torque: The pulsating torque of DFIG should have as lower as possible during six step inverters feeding. …”

Fault-Tolerant Fuzzy Logic Control of a 6-Phase Axial Flux Permanent-Magnet Synchronous Generator

“…One solution to increase the efficiency and reliability of the generator is to use a multiphase machine with symmetrical [8][9][10][11][12][13] or asymmetrical windings [14][15][16][17][18].…”

Improved Mathematical Modeling of Six Phase Induction Machines Based on Fractional Calculus

“…Multiphase machines are used nowadays in a number of industrial applications, such as high-speed elevators, trains, ship propulsion, oil and gas industry, and high-power wind energy conversion systems [1]- [2]. This is a result of their advantages over traditional three phase machines, including lower torque ripples, higher efficiency, lower space harmonics content, lower power ratings of semiconductor devices and higher fault tolerance [2], [3].…”