Design considerations for fractional-slot winding configurations of synchronous machines

This paper presents some design considerations for synchronous machines characterized by a fractional number of slots per pole per phase. The main advantage of this configuration is a smooth torque, which is due to the elimination of periodicity between slots and poles. A second advantage is a highe...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2006-07, Vol.42 (4), p.997-1006
Main Authors: Bianchi, N., Bolognani, S., Pre, M.D., Grezzani, G.
Format: Article
Language:English
Subjects:
Circuit faults
Coils
Costs
Electric machines
Fault tolerance
Fault-tolerant solutions
Harmonics
Inductance
Inverters
Machine windings
Mathematical analysis
permanent-magnet (PM) machines
Poles
reluctance (REL) machines
Ripples
Synchronous machines
Torque
Winding
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Summary:This paper presents some design considerations for synchronous machines characterized by a fractional number of slots per pole per phase. The main advantage of this configuration is a smooth torque, which is due to the elimination of periodicity between slots and poles. A second advantage is a higher fault-tolerant capability, making the machine able to work even in faulty conditions. However, the fractional-slot configuration presents a high content of MMF harmonics that may cause an unbalanced saturation and thus an unbearable torque ripple. A method to design fractional-slot machines is illustrated in this paper, including double-layer and single-layer windings. The analytical computation is extended to determine the harmonics of MMF distribution. Their effect is highlighted in isotropic as well as anisotropic machines. Finally, some considerations are reported to avoid unsuitable configurations
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2006.876070