Design and Performance Characteristics of IPM Machines with Single Layer Non-Overlapping Concentrated Windings

A stator with a steel core is well suited for small, low speed PM machines, where core losses are much lower than copper losses. However, a slotted stator introduces cogging torque. A stator with parallel-teeth inherently lowers cogging torque but there is need to further reduce it. This is particularly important in wind generators since it raises the cut-in wind speed, thereby lowering the energy captured yield for a given installed capacity. Pulsating torques also produces noise and mechanical vibrations which accelerates the wear of the machine and its support structure. This paper presents some effective methods of minimizing cogging torque, which have minimal effects on the performance of the machine. Three PM rotor configurations were considered, which include: a pole-arc ratio of 0.80, alternating pole-arcs of 0.61 and 0.80, and skewed PM poles with a skew one slot-pitch. The 3 rotor configurations were simulated numerically using 3D Finite Element Analysis (FEA) and tested experimentally with the same stator. The machine topology with a rotor pole-arc ratio of 0.80 was used as the reference design. From the experimental results, the alternating pole-arcs effectively reduced coggingtorque by 73% whereas the skewed poles reduced it by 48%. The 3D-FEA and experimental cogging torque results are also comparable. The paper also compares cogging torque reduction techniques which are well suited for a parallel-teeth stator.Index Terms-Axial-Flux, Cogging torque, Finite element analysis, Parallel-teeth, Permanent Magnet, Ripple torque 978-1-4577-0541-0/11/$26.00 ©2011 IEEE

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“…periodicity, F according to [11], [12], [13]. The repeating element allows a section of the machine to be modeled saving on computation time.…”

Section: Fea Of An Axial-flux Pmsgmentioning

confidence: 99%

Minimization of cogging torque in a small axial-flux PMSG with a parallel-teeth stator

Wanjiku

Jagau

Khan

et al. 2011

2011 IEEE Energy Conversion Congress and Exposition

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“…The most popular combinations of pole and slot numbers are those giving a number of slots per pole per phase q equal to 2/5 or 2/7. PMSMs with q ¼ 0.5 have sometimes an irregular distribution of teeth as in Germishuizen (2007) and Deak et al (2006)…”

Section: Examplesmentioning

confidence: 99%

Design guidelines and models for PMSMs with non‐overlapping concentrated windings

Soulard

Meier

2011

COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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Purpose -The purpose of this paper is to present a general review of design guidelines and analytical models for permanent-magnet synchronous machines (PMSMs) with non-overlapping concentrated windings, including the authors' own experience. Design/methodology/approach -The design features specific to three-phase PMSMs with non-overlapping concentrated windings are presented following the proposed chronology for the different choices to be made by motor designers. Findings -It is shown that the selections of the stator core manufacturing method, the number of winding layers, the combination of pole and slot numbers, and the geometry of the tooth tips are crucial during the design stage of the machine. Comprehensive lists of references introducing useful analytical models and prototypes presented in literature are provided. Practical implications -By following the guidelines provided in the paper, motor designers are able to avoid the known drawbacks of PMSMs with non-overlapping concentrated windings, and have a ready list of sources describing useful analytical models. Originality/value -PMSMs with non-overlapping concentrated windings have recently been widely investigated. This paper provides an overview of the main results, pinpointing the choices encountered by the motor designers.

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Determination of equivalent circuit parameters of a direct drive wind power generator

Brasas

Germishuizen

2012

2012 XXth International Conference on Electrical Machines

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Design and Performance Characteristics of IPM Machines with Single Layer Non-Overlapping Concentrated Windings

Cited by 4 publications

References 9 publications

Minimization of cogging torque in a small axial-flux PMSG with a parallel-teeth stator

Minimization of cogging torque in a small axial-flux PMSG with a parallel-teeth stator

Design guidelines and models for PMSMs with non‐overlapping concentrated windings

Determination of equivalent circuit parameters of a direct drive wind power generator

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