Improved analytical model for predicting the magnetic field distribution in brushless permanent-magnet machines

Zhu, Z. Q.; Howe, D.; Chan, C. C.

doi:10.1109/20.990112

Cited by 432 publications

(197 citation statements)

References 8 publications

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“…The airgap flux was determined by solving the Laplace's and Poisson's equations of the scalar magnetic potentials I ϕ and II ϕ in the airgap and magnets, respectively, as described in [12], assuming parallel magnetised magnets:…”

Section: Methodsmentioning

confidence: 99%

Structurally integrated slotless PM brushless motor with spiral wound laminations for marine thrusters

Lai¹,

Sharkh²

2006

3rd IET International Conference on Power Electronics, Machines and Drives (PEMD 2006)

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Rim driven thrusters with structurally integrated brushless PM motors are now an established technology with an increasing range of applications. In these thrusters, the stator of the motor is housed within the thruster duct, and the rotor forms a ring around the tips of the propeller. Such high pole number motors tend to be very thin radialy, have very small length to diameter ratios, and have relatively large airgaps to accommodate corrosion protection layers on the surfaces of the rotor and stator. The relatively large diameter stator laminations of such machines tend therefore to have very thin back of core and narrow teeth, which make them expensive and difficult to manufacture. This paper proposes an alternative potentially lower cost motor topology featuring a slotless stator whose laminations are manufactured from a single strip of steel that is edge wound into a spiral (like a "slinky" and then fitted over the windings that are preformed on the outside surface of a non-conducting former. The former is also part of the sealed housing that protects the stator from corrosion in seawater. The paper discusses the design optimisation of such a motor using analytical and finite element analysis (FEA), describes a demonstrator motor and reports experimental and FEA results.

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Section: Methodsmentioning

confidence: 99%

Structurally integrated slotless PM brushless motor with spiral wound laminations for marine thrusters

Lai¹,

Sharkh²

2006

3rd IET International Conference on Power Electronics, Machines and Drives (PEMD 2006)

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“…where the coefficients K n (r) and D n (r) are calculated according to [17] and j = √ −1 is the pure imaginary part. The CP function (both for the multiple-slots and single-slot models) using the rotor's reference frame is…”

Section: Representation Of the Limitsmentioning

confidence: 99%

Analysis of slotting models for the calculation of no-load rotor losses in PM machines

Anglada

Sharkh

Qazalbash

2016

2016 XXII International Conference on Electrical Machines (ICEM)

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Abstract-The magnetic flux density distribution in the airgap of electric machines is essential for accurate prediction of no-load eddy-current power losses. The effect of slotting can be modelled using a simplified single-slot model or a complete multiple-slots model. Until now there has not been a clear and justified criterion to choose between the two models. In this paper we propose a criterion based on the conformal transformations used to calculate the magnetic field distribution of single-slot and multiple-slots models. The computational implementation of both methods produced a graph that clearly shows which method to use as a function of the normalised geometrical parameters of the machine. The paper presents a case study of a high speed machine whose proportions fall within the multiple-slot model range, according to the criterion proposed. It is shown that using a single slot model in this case results in significant errors in the estimation of rotor losses. Better agreement with FEA results is achieved when a multipleslot model is used.

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“…We can consider this work as a result of a previous work given in [7]. The magnetization is supposed constant in all permanent magnets.…”

Section: Introductionmentioning

confidence: 99%

“…In magnetic field calculation of electrical permanent magnet machines, most authors consider a real direction of magnetization (parallel) [6][7][8][9][24][25][26][27][28]. They consider only one permanent magnet by pole.…”

Section: Introductionmentioning

confidence: 99%

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Analytical Model on Real Geometries of Magnet Bars of Surface Permanent Magnet Slotless Machine

Boutora¹,

Takorabet²,

Ibtiouen³

2016

PIER B

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Abstract-We present in this paper an analytical model for the calculation of the electromagnetic field in a slotless surface mounted permanent magnet machines. This model takes into account the two essential directions of magnetization of the magnets, namely tangential magnetization and radial magnetization. It especially accounts for the parallel form of the magnetization direction. The model uses equivalent currents on the surfaces of the magnets, and in an original way, it uses currents in all volume of the magnet. The model is validated by numerical results obtained with a free software of calculation of the electromagnetic fields (FEMM: Finite Element Method Magnetics) which uses the finite elements method and by an existing experimental structure. The model is extended to the magnets segmented in bars and separated. It is then extended to the shape of magnets close to parallepiped forms which are really used in large machines.

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Improved analytical model for predicting the magnetic field distribution in brushless permanent-magnet machines

Cited by 432 publications

References 8 publications

Structurally integrated slotless PM brushless motor with spiral wound laminations for marine thrusters

Structurally integrated slotless PM brushless motor with spiral wound laminations for marine thrusters

Analysis of slotting models for the calculation of no-load rotor losses in PM machines

Analytical Model on Real Geometries of Magnet Bars of Surface Permanent Magnet Slotless Machine

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