Modeling and analysis of effects of skew on torque ripple and stator tooth forces in permanent magnet AC machines

Sizov, Gennadi Y.; Zhang, P.; Ionel, Dan M.; Demerdash, Nabeel A. O.; Brown, Ian; Smith, A.; Solveson, Mark

doi:10.1109/ecce.2012.6342514

Cited by 16 publications

(13 citation statements)

References 7 publications

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“…These differences are due to the current harmonics link to our model: the slices are magnetically and electrically independent. Other techniques, including a coefficient of harmonic twist [12][13], could allow the use of this multi-slice model to have good harmonic content in these radial pressures.…”

Section: Resultsmentioning

confidence: 98%

See 1 more Smart Citation

Skew effect on the radial pressure of induction motor

Despret

Hecquet

Lanfranchi

et al. 2016

2016 Eleventh International Conference on Ecological Vehicles and Renewable Energies (EVER)

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Acoustics comfort is an increasingly important factor at the design stage of electrical machines associated with converters. Skewing has a direct impact on pressure in the air-gap, which can be responsible for electromagnetic noise. This paper aims to compare different models to study the skewing. The impact of pressures is evaluated and analyzed for no-skew and skew rotors. Three numerical electromagnetic models are compared: 2D finite element method (FEM), 2D FEM multi-slice and 3D FEM. In addition, an experimental measurement validates our results.Ke y words-Maxwell forces; air-gap radial pressure; spatial order and frequenc y ; finite element anal y sis; anal y tical anal y sis; skew rotor;

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Section: Resultsmentioning

confidence: 98%

“…An alternative solution for the electromagnetic simulation with skewed slots are used a multi-slice FE model [9], [12], [13]. These papers used this approach to reduce the computing time and demonstrate the capability to calculate the 3D effects with the skew factor.…”

Section: Introductionmentioning

confidence: 99%

Skew effect on the radial pressure of induction motor

Despret

Hecquet

Lanfranchi

et al. 2016

2016 Eleventh International Conference on Ecological Vehicles and Renewable Energies (EVER)

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“…Previous publications have proven the satisfactory accuracy of the CE-FEA method [10]- [13]. The back-emf and induced voltage waveforms, ripple and average torque, as well as stator core losses can be calculated systematically using the CE-FEA technique [10], [11].…”

Section: Introductionmentioning

confidence: 99%

Multi-Objective Tradeoffs in the Design Optimization of a Brushless Permanent-Magnet Machine With Fractional-Slot Concentrated Windings

Zhang

Sizov

et al. 2014

IEEE Trans. on Ind. Applicat.

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In this paper, a robust parametric model of a brushless permanent magnet machine with fractional-slot concentrated windings, which was developed for automated design optimization is presented. A computationally efficient finite-element analysis method was employed to estimate the dq-axes inductances, the induced voltage and torque ripple waveforms, and losses of the machine. A method for minimum effort calculation of the torque angle corresponding to the maximum torque per ampere load condition was developed. A differential evolution algorithm was implemented for the global design optimization with two concurrent objectives of minimum losses and minimum material cost. An engineering decision process based on the Pareto-optimal front for 3,500 candidate designs is presented together with discussions on the tradeoffs between cost and performance. One optimal design was finally selected, prototyped and successfully tested.Index Terms-Differential evolution (DE), finite-element analysis, fractional-slot concentrated winding, multi-objective design optimization, permanent-magnet (PM) machine.

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“…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%

“…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%

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

show abstract

Modeling and analysis of effects of skew on torque ripple and stator tooth forces in permanent magnet AC machines

Cited by 16 publications

References 7 publications

Skew effect on the radial pressure of induction motor

Skew effect on the radial pressure of induction motor

Multi-Objective Tradeoffs in the Design Optimization of a Brushless Permanent-Magnet Machine With Fractional-Slot Concentrated Windings

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

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