Winding factors and Joule losses of permanent magnet machines with concentrated windings

Magnussen, Freddy; Sadarangani, Chandur

doi:10.1109/iemdc.2003.1211284

Cited by 329 publications

(174 citation statements)

References 4 publications

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“…The average electromagnetic torque is proportional to the winding factor. Disregarding the end windings effects, an electrical machine with low winding factor needs to compensate its lower torque with higher current density, which leads to higher Joule losses compared to a machine with a winding factor equal to 1, for the same torque, assuming equal slot fill factor and comparable magnetic design [13].…”

Section: Stators Structurementioning

confidence: 99%

Prototype of an axial flux permanent magnet generator for wind energy systems applications

Ferreira

Silva²,

Costa³

2007

2007 European Conference on Power Electronics and Applications

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Small scale wind power applications require a cost effective and mechanically simple generator in order to be a reliable energy source. The use of direct driven generators, instead of geared machines, reduces the number of drive components, which offers the opportunity to reduce costs and increases system reliability and efficiency. For such applications, characterized by low speed of rotation, the axial flux permanent magnet generator is particularly suited, since it can be designed with a large pole number and high torque density. This paper presents a double-sided axial flux permanent magnet low-speed generator, with internal rotor and slotted stators. Such a structure gives a good compromise between performance characteristics and feasibility of construction. Test results obtained from the prototype are reported.

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Section: Stators Structurementioning

confidence: 99%

Prototype of an axial flux permanent magnet generator for wind energy systems applications

Ferreira

Silva²,

Costa³

2007

2007 European Conference on Power Electronics and Applications

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“…End windings contribute to this loss but do not actively contribute to any torque production in the machine. The per unit average end turn length for single and double layer FSCW and distributed windings can be approximated (adapted from [10] …”

Section: A End Winding Length Reductionmentioning

confidence: 99%

Higher Pole Number Synchronous Reluctance Machines with Fractional Slot Concentrated Windings

Spargo¹,

Mecrow²,

Widmer³

2014

7th IET International Conference on Power Electronics, Machines and Drives (PEMD 2014)

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractThis paper presents an examination of the advantages, disadvantages and remaining challenges of the application of fractional slot concentrated windings to higher pole number (pole-pairs > 2) synchronous reluctance machines. It extends previous work by assessing the effects of the available slotpole combinations on machine performance and construction. Finite element studies and figures of merit derived from d-q axis theory are used to compare and assess performance. Manufacturing and constructional issues are also discussed.

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“…This formula results from the analysis of the distribution of the magnetic field harmonics in the motor air-gap, like the other methods, but it gives best angle of skew for the particular motor, and not the minimum one like the other approaches. In the conventional methods, the starting point of the considerations is a skew factor which is a component of winding factor [10,11]. In the simplest manner, the influence of skew on jth harmonic of the magnetic flux density is considered the same with an averaging filter:…”

Section: Introductionmentioning

confidence: 99%

“…Although much has been done in this area to date, newer publications show that it is still of significant concern to the designers of permanent magnet machines [7][8][9][10][11]. Among many approaches developed to cope with this problem, the skew of the stator stack sheet pack is the most natural and perhaps, the simplest method of preventing the machine from generating the reluctance-type torques to apply at the design stage [1,3,[7][8][9][10][11]. In permanent magnet machines, the major task of skew is to get rid of the cogging torque.…”

Section: Introductionmentioning

confidence: 99%

Investigation on a choice of stator slot skew angle in brushless PM machines

2012

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The paper investigates the effects of stator slot skewing in a permanent magnet brushless DC motor. A simple analytic formula for calculation of the best angle of stack skew, which leads to nearly total reduction of the cogging torque, is developed. The skew angle obtained from this formula is different to that used by the designers of PM brushless motors. The analysis is carried out for a fractional horsepower brushless permanent magnet motor with the surface-mounted magnets using a time-stepping, multi mesh-slice finite element model, to assess the impact of this change. The steady-state characteristics and core losses are analyzed quantitatively using the elaborated numerical model. It is shown that smaller skew angles obtained from the formula lead to noticeable rise in motor overall efficiency and decrease of the core loss. The possibility of accomplishment of the desired effect of skew in a real machine is also a subject of discussion.

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Winding factors and Joule losses of permanent magnet machines with concentrated windings

Cited by 329 publications

References 4 publications

Prototype of an axial flux permanent magnet generator for wind energy systems applications

Prototype of an axial flux permanent magnet generator for wind energy systems applications

Higher Pole Number Synchronous Reluctance Machines with Fractional Slot Concentrated Windings

Investigation on a choice of stator slot skew angle in brushless PM machines

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