Adjustable Flux Three-Phase AC Machines With Combined Multiple-Step Star-Delta Winding Connections

In this paper, a complete theory and analysis method for combined star-delta three-phase windings from the point of view of magnetomotive force spatial harmonics content and equivalent winding factors calculation is developed. The method allows for any spatial angle and any coils percentage distribu...

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Bibliographic Details
Published in:IEEE transactions on energy conversion 2010-06, Vol.25 (2), p.348-355
Main Authors: Cistelecan, Mihail V, Ferreira, Fernando J T E, Popescu, Mihail
Format: Article
Language:English
Subjects:
AC machines
Adjustable
Clocks
Coils
Deltas
Flux
Harmonic analysis
Harmonics
Induction motors (IMs)
Joining processes
Level control
Machine windings
Magnetic analysis
Magnetic flux
permanent magnet (PM) synchronous generators
Permanent magnets
Stars
stator winding connection modes
Studies
Testing
Winding
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Summary:In this paper, a complete theory and analysis method for combined star-delta three-phase windings from the point of view of magnetomotive force spatial harmonics content and equivalent winding factors calculation is developed. The method allows for any spatial angle and any coils percentage distribution between star and delta balanced winding systems. It is proven that connecting the inner delta in the clockwise or counterclockwise direction leads to two different space angles between the star and delta systems and two different steps in the flux level control. It means that, compared to what is known and applied up to now, using n winding sections in each phase, it is possible to obtain 2 n steps (instead of n + 1) in the flux level. To check the analysis validity, two experimental tests are reported on both squirrel-cage, integer-winding, induction motor, and permanent magnet, low-speed, fractional-winding, synchronous generator with a specially designed stator winding, allowing multiple-step air-gap flux regulation.
ISSN:0885-8969
1558-0059
DOI:10.1109/TEC.2009.2035692