Permanent-magnet machines with powdered iron cores and prepressed windings

Jack, A.G.; Mecrow, B.C.; Dickinson, P.G.; Stephenson, David; Burdess, J.S.; Fawcett, N.; Evans, J.T.

doi:10.1109/28.855963

Cited by 140 publications

(54 citation statements)

References 4 publications

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“…Unlike DW, which overlap one or more stator teeth, CW are wound around individual stator teeth. The coil around individual stator teeth can take advantage of more advanced winding methods, such as the joint lapped core methods [35,37] and use of modular stator tooth pieces [36]. These methods claimed to achieve up to 75% and 78% slot-fill factor respectively.…”

Section: Stator Winding Copper Lossesmentioning

confidence: 99%

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Analysis and Experimental Verification of Losses in a Concentrated Wound Interior Permanent Magnet Machine

Dutta¹,

Chong²,

Rahman³

2013

PIER B

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Abstract-It is well known that additional space harmonics in the air-gap magnetomotive force (MMF) distribution of the concentrated non-overlapping windings (CW) cause additional losses in the machine. This is especially so for machines used for traction applications where the machine requires to operate over its rated speed and frequency. In this paper, the authors investigates losses present in an interior permanent magnet (IPM) machine with CW designed to achieve a very wide field weakening range. Losses were quantified analytically and also using finite element methods.Loss estimations were experimentally verified in a constructed prototype machine. Based on the analysis, key losses were identified. The optimization process to minimize these losses and of improving efficiency were discussed in details. The segregation of the losses in the studied machine indicates that the losses in the magnet are much smaller compared to the rotor and stator core losses caused by the slot harmonics. Therefore, core loss minimization techniques for this type of machine will involve reduction of slot harmonics. Also, copper loss is found to be the most dominating component of the total loss. Hence, copper loss minimization should be part of the design optimization process.

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Section: Stator Winding Copper Lossesmentioning

confidence: 99%

“…Approximately 60% can be achieved by highly skilled winders [35,36]. Unlike DW, which overlap one or more stator teeth, CW are wound around individual stator teeth.…”

Section: Stator Winding Copper Lossesmentioning

confidence: 99%

Analysis and Experimental Verification of Losses in a Concentrated Wound Interior Permanent Magnet Machine

Dutta¹,

Chong²,

Rahman³

2013

PIER B

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“…Furthermore, new types of materials have been developed in recent years which require novel models. For example, soft magnetic composites made from powder [50] continue to have an impact. Possible benefits include faster manufacturing at lower cost, improved thermal properties and higher frequency capability.…”

Section: Computational Electromagnetics For Design Optimisationmentioning

confidence: 99%

Computational electromagnetics for design optimisation: the state of the art and conjectures for the future

Sykulski¹

2009

Bulletin of the Polish Academy of Sciences: Technical Sciences

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Abstract. The paper reviews the state of the art in modern field simulation techniques available to assist in the design and performance prediction of electromechanical and electromagnetic devices. Commercial software packages, usually exploiting finite element and/or related techniques, provide advanced and reliable tools for every-day use in the design office. At the same time Computational Electromagnetics continues to be a thriving area of research with emerging new techniques and methods, in particular for multi-physics applications and in the area of multi-objective optimisation.

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“…Insulated iron powders tend to perform better than steel laminations at frequencies higher than 400 Hz [2,6,12]. However, for low frequency AC soft magnetic applications, the materials must have high permeability, low core losses and acceptable mechanical strength to compete with steel laminated assemblies.…”

Section: Introductionmentioning

confidence: 99%

Interparticle Neck Connections in Innovative Insulated Iron Powder Compounds

et al. 2015

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Goal of the present paper is the analysis of the interparticle neck connections in a system made of insulated iron powder compounds with dierent additions of an AlMgSiCu alloy (0.25, 0.5 and 0.75 wt%). The introduction of the aluminium alloy powder has been made in order to improve the mechanical properties, evaluated as the transverse rupture strength, without decreasing the magnetic properties (evaluated in terms of iron loss and coercivity force). The fracture analysis of investigated systems puts into evidence the breaking of interparticle neck connections. Heat treatment (at the temperature of 500• C) contributes to the early stages of interparticle neck developments. The chosen aluminium alloy presents a sort of pre-sintering behaviour at 500• C, with the possibility of mass-transport processes around the insulated iron powder compounds. The air heat treatment applied aims at providing an increase in the mechanical behaviour of the material, with a nal good rigidity after the cooling process. Fracture surfaces and transverse rupture strength values show that, at 500 MPa, the strength and the area related to the inter-particle necks can be correlated to the occasional broken insulated point-to-point surfaces that hinder the development of inter-particles necks.

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Permanent-magnet machines with powdered iron cores and prepressed windings

Cited by 140 publications

References 4 publications

Analysis and Experimental Verification of Losses in a Concentrated Wound Interior Permanent Magnet Machine

Analysis and Experimental Verification of Losses in a Concentrated Wound Interior Permanent Magnet Machine

Computational electromagnetics for design optimisation: the state of the art and conjectures for the future

Interparticle Neck Connections in Innovative Insulated Iron Powder Compounds

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