Calculation of Magnet Losses in Concentrated-Winding Permanent-Magnet Synchronous Machines Using a Computationally Efficient Finite-Element Method

Zhang, Peng; Sizov, Gennadi Y.; He, Jiangbiao; Ionel, Dan M.; Demerdash, Nabeel A. O.

doi:10.1109/tia.2013.2264652

Cited by 78 publications

(35 citation statements)

References 12 publications

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“…From this study, the design variables with significant effects on these design objectives were selected, and the ranges of these variables were defined, which contributed to the "well-conditioned" convergence of the DE algorithm. In this design optimization method, the computationally efficient finite-element analysis (CE-FEA) approach [12][13]14 was utilized to calculate the performance parameters and characteristics of all obtained design candidate machines. This analysis method utilizes only a reduced set of magnetostatic field solutions to satisfactorily compute the performance of PM machines regulated by sine-wave current supplies.…”

Section: Optimization Formulation and General Proceduresmentioning

confidence: 99%

“…This analysis method utilizes only a reduced set of magnetostatic field solutions to satisfactorily compute the performance of PM machines regulated by sine-wave current supplies. [12][13]14 The design of a PM machine is subject to conflicting requirements and constraints. A formal mathematical approach for this problem is provided by a multiobjective optimization process.…”

Section: Optimization Formulation and General Proceduresmentioning

confidence: 99%

See 1 more Smart Citation

Establishing the Relative Merits of Interior and Spoke-Type Permanent-Magnet Machines With Ferrite or <roman>NdFeB</roman> Through Systematic Design Optimization

Zhang

Sizov

Ionel

et al. 2015

IEEE Trans. on Ind. Applicat.

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In this paper, a multiobjective design optimization method combining design-of-experiments techniques and differential-evolution algorithms is presented. The method was implemented and utilized in order to provide practical engineering insights for the optimal design of interior and spoketype permanent-magnet machines. Two combinations with 12 slots and 8 poles and 12 slots and 10 poles, respectively, have been studied in conjunction with rare-earth neodymium-iron-boron (NdFeB) and ferrites. As part of the optimization process, a computationally efficient finite-element electromagnetic analysis was employed for estimating the performance of thousands of candidate designs. Three optimization objectives were concurrently considered for minimum total material cost, power losses, and torque ripple, respectively. Independent variables were considered for both the stator and rotor geometries. A discussion based on a systematic comparison is included, showing, among other things and despite common misconception, that comparable cost versus loss Paretos can be achieved with any of the rotor topologies studied. VERSION; this is the author's final, peer-reviewed manuscript. The published version may be accessed by following the link in the citation at the bottom of the page. NOT THE PUBLISHED

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Section: Optimization Formulation and General Proceduresmentioning

confidence: 99%

Section: Optimization Formulation and General Proceduresmentioning

confidence: 99%

Establishing the Relative Merits of Interior and Spoke-Type Permanent-Magnet Machines With Ferrite or <roman>NdFeB</roman> Through Systematic Design Optimization

Zhang

Sizov

Ionel

et al. 2015

IEEE Trans. on Ind. Applicat.

Self Cite

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“…Heat sources on the rotor can affect fatigue limits of materials or worse, lead to overtemperature in the magnets resulting in demagnetization and delevitation. There are different ways of estimating eddy current losses, of which a few are listed here in rising order of computational complexity: Analytical solutions [5,15]; stationary Finite Element Method (FEM) solutions coupled with analytical equations [4,19]; quasi-stationary FEM-simulations [20]; and time-dependent FEM-simulations. Analytical equations have been developed to model electric machines with good accuracy compared to quasi-stationary 3D-FEM simulations [9].…”

Section: Introductionmentioning

confidence: 99%

Eddy currents in a passive magnetic axial thrust bearing for a flywheel energy storage system

Hedlund¹,

Abrahamsson²,

Perez-Loya³

et al. 2017

JAE

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Abstract. Two types of passive magnetic lift bearings were evaluated in terms of thrust force and eddy current losses. The first type of bearings were based on two sets of segmented Halbach arrays mounted in repulsive mode, and the second type was based on ring-magnets. The eddy-currents studied arose in the bearing due to manufacturing variations of magnetic remanence, and due to non-radial magnetization. Both a 3D time-dependent and a quasi-stationary Finite-Element Method (FEM) formulation were used, and the simulated results were compared with lift-force measurements from experiment. The losses were found (by FEM) to be in the order of 25 W at a rotational speed of 30000 rpm while lifting a 45 kg rotor with a stiffness of 359 N/mm.

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“…Essentially, predicting the losses in the PMs can be done accurately using three-dimensional (3D) finite-element (FEM)-based simulations (as demonstrated in [17]). However, the approach must still be considered relatively time consuming, although efforts have been made to reduce the computation times [18]. Recently, the relatively simple analytical loss model in [19] was proposed considering FSCWs with surface-mounted PMs and including the effect of both axial and tangential segmentation of the PMs.…”

Section: Introductionmentioning

confidence: 99%

Limitations and Constraints of Eddy-Current Loss Models for Interior Permanent-Magnet Motors with Fractional-Slot Concentrated Windings

Zhang

Wallmark

2017

Energies

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This paper analyzes and compares models for predicting average magnet losses in interior permanent-magnet motors with fractional-slot concentrated windings due to harmonics in the armature reaction (assuming sinusoidal phase currents). Particularly, loss models adopting different formulations and solutions to the Helmholtz equation to solve for the eddy currents are compared to a simpler model relying on an assumed eddy-current distribution. Boundaries in terms of magnet dimensions and angular frequency are identified (numerically and using an identified approximate analytical expression) to aid the machine designer whether the more simple loss model is applicable or not. The assumption of a uniform flux-density variation (used in the loss models) is also investigated for the case of V-shaped and straight interior permanent magnets. Finally, predicted volumetric loss densities are exemplified for combinations of slot and pole numbers common in automotive applications.

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Calculation of Magnet Losses in Concentrated-Winding Permanent-Magnet Synchronous Machines Using a Computationally Efficient Finite-Element Method

Cited by 78 publications

References 12 publications

Establishing the Relative Merits of Interior and Spoke-Type Permanent-Magnet Machines With Ferrite or <roman>NdFeB</roman> Through Systematic Design Optimization

Establishing the Relative Merits of Interior and Spoke-Type Permanent-Magnet Machines With Ferrite or <roman>NdFeB</roman> Through Systematic Design Optimization

Eddy currents in a passive magnetic axial thrust bearing for a flywheel energy storage system

Limitations and Constraints of Eddy-Current Loss Models for Interior Permanent-Magnet Motors with Fractional-Slot Concentrated Windings

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