Prediction of the electromagnetic torque in synchronous machines through Maxwell stress harmonic filter (HFT) method

Popescu, Mircea

doi:10.1007/s00202-005-0323-1

Cited by 20 publications

(10 citation statements)

References 16 publications

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“…Classically, given the stress tensor T, one can compute the torque by integrating r × (T · dS) [92]. This has been exploited by several authors to compute classical electromagnetic torques [93,94,95]. Similarly, the Casimir torque can be obtained by using the mean T from the fluctuation-dissipation theorem, just as for the net force [34].…”

Section: Discussionmentioning

confidence: 99%

Virtual photons in imaginary time: Computing exact Casimir forces via standard numerical electromagnetism techniques

et al. 2007

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We describe a numerical method to compute Casimir forces in arbitrary geometries, for arbitrary dielectric and metallic materials, with arbitrary accuracy (given sufficient computational resources). Our approach, based on well-established integration of the mean stress tensor evaluated via the fluctuation-dissipation theorem, is designed to directly exploit fast methods developed for classical computational electromagnetism, since it only involves repeated evaluation of the Green's function for imaginary frequencies (equivalently, real frequencies in imaginary time). We develop the approach by systematically examining various formulations of Casimir forces from the previous decades and evaluating them according to their suitability for numerical computation. We illustrate our approach with a simple finite-difference frequency-domain implementation, test it for known geometries such as a cylinder and a plate, and apply it to new geometries. In particular, we show that a piston-like geometry of two squares sliding between metal walls, in both two and three dimensions with both perfect and realistic metallic materials, exhibits a surprising non-monotonic "lateral" force from the walls.

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Section: Discussionmentioning

confidence: 99%

Virtual photons in imaginary time: Computing exact Casimir forces via standard numerical electromagnetism techniques

et al. 2007

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“…Methods based on Maxwell's stress tensor are commonly used in the computation of torques for electromagnetic devices when finite element method is employed [13]. The electromagnetic torque is obtained as a surface integral:…”

Section: Torque Calculation From Maxwell's Stress Tensor Methodsmentioning

confidence: 99%

Design Optimization of Two Synchronous Reluctance Machine Structures With Maximized Torque and Power Factor

Tahi¹,

Ibtiouen²,

Bounekhla³

2011

PIER B

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Abstract-The subject of this article is to optimize the design of synchronous reluctance machines with massive rotor and multi-flux barrier rotor. The optimization procedure, which aims to improve simultaneously the machines' torque and the power factor, uses the cyclic coordinate method coupled with the magnetostatic finiteelement (FE) field solutions. The optimization results regarding these two types of machines, which provide the optimized rotor geometrical dimensions and the influence of the current angle, are discussed.

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“…Also, the torque profile and cogging torque are calculated using the harmonic filter method. This method has been developed to be used with the FEM method in [20]. Since the magnetic vector potential is calculated in the S-C method, therefore, this method can be applied to this case too.…”

Section: Verify Model For Shape Optimisationmentioning

confidence: 99%

Combined ON/OFF and conformal mapping method for magnet shape optimisation of SPMSM

Mirahki

Moallem

Ebrahimi

et al. 2018

IET Electric Power Applications

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In this study, a combined ON/OFF and conformal mapping method is applied to the permanent magnet shape optimisation of the surface-mounted permanent magnet synchronous motor (SPMSM). The magnet shape has a profound impact on the cogging torque and torque profile of the SPMSM. The proposed method is based on the combination of the conformal mapping and ON/OFF methods, which can reduce computation time significantly as compared with methods that are based on the finite-element method (FEM). For the optimisation process, genetic algorithms are used and applied to three cases. Finally, the FEM is used to verify the magnetic model and characteristics of the optimised machine.

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Prediction of the electromagnetic torque in synchronous machines through Maxwell stress harmonic filter (HFT) method

Cited by 20 publications

References 16 publications

Virtual photons in imaginary time: Computing exact Casimir forces via standard numerical electromagnetism techniques

Virtual photons in imaginary time: Computing exact Casimir forces via standard numerical electromagnetism techniques

Design Optimization of Two Synchronous Reluctance Machine Structures With Maximized Torque and Power Factor

Combined ON/OFF and conformal mapping method for magnet shape optimisation of SPMSM

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