Accuracy problems of force and torque calculation in FE-systems

Tarnhuvud, T.; Reichert, K.

doi:10.1109/20.43952

Cited by 77 publications

(35 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The difficulties associated with the precise computation of the electromagnetic torque and its pulsating components from FE solutions have been discussed and some improved procedures proposed [1,[3][4][5][7][8][9][10]13,14,17]. The study presented in this paper brings further contributions to the subject, by analyzing the electromagnetic torque with a dedicated formulation [15,16].…”

Section: Introductionmentioning

confidence: 99%

“…Studies [2,7,8] have shown that the integration contour should not be through nodes or along boundaries of elements and that several contours should be chosen to determine an average value and the range of uncertainty for the torque. It is also recommended that the definition of the integration contour to be as displaced several elements (at least two elements) away from any interface boundaries.…”

Section: Theory and Mathematical Modelsmentioning

confidence: 99%

“…For linear (first-order) elements in [1,8] is suggested a zig-zag integration path through the midpoints of the elements and elements sides. Studies [2,7,8] have shown that the integration contour should not be through nodes or along boundaries of elements and that several contours should be chosen to determine an average value and the range of uncertainty for the torque.…”

Section: Theory and Mathematical Modelsmentioning

confidence: 99%

See 2 more Smart Citations

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

Popescu

2005

Electr Eng

View full text Add to dashboard Cite

For the calculation of torque in synchronous motors a local method is analysed, based on the Maxwell stress theory and the filtered contributions due to the harmonics of the magnetic vector potential in the motor air-gap. By considering the space fundamental field only, the method can efficiently estimate the average synchronous torque for a variety or motor topologies, including concentrated winding designs. This approach employs an analytical filter for the Maxwell stress tensor and 'frozen permeability' technique. The proposed method is validated by comparison with FE results for several synchronous motor types: interior permanent magnet motors, wound field motor, synchronous reluctance motor.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Theory and Mathematical Modelsmentioning

confidence: 99%

Section: Theory and Mathematical Modelsmentioning

confidence: 99%

See 1 more Smart Citation

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

Popescu

2005

Electr Eng

View full text Add to dashboard Cite

show abstract

“…The magnetic force on the modulating pieces can be calculated by using the Maxwell stress tensor [11][12][13]. The radial force, F r and tangential force, F θ are given by integrating the magnetic flux densities over the surface as in (3) and (4), respectively.…”

Section: Mechanical Characteristics On the Modulating Piecesmentioning

confidence: 99%

Analysis of Coaxial Magnetic Gear with Low Gear Ratios for Application in Counter Rotating Systems

Shin¹,

Chang²

2015

Journal of Magnetics

View full text Add to dashboard Cite

This paper describes the electromagnetic and mechanical characteristics of coaxial magnetic gear (CMG) with a low gear ratio. The analysis models are restricted to a CMG with a gear ratio of less than 2. The electromagnetic characteristics including transmitted torque and iron losses are presented according to the variation of the gear ratio. The pole pairs of high speed rotor are chosen as 6, 8 and 10 by considering the torque capability. As the gear ratio approaches 1, both iron losses on the ferromagnetic materials and eddy current losses on the rotor permanent magnets are increased. The radial and tangential forces on the modulating pieces are calculated using the Maxwell stress tensor. When the maximum force is exerted on the modulating pieces, the mechanical characteristics including stress and deformation are derived by structural analysis. In CMG models with a low gear ratio, the maximum radial force acting on modulating pieces is larger than that in CMG models with a high gear ratio, and the normal stress and normal deformation are increased in a CMG with a low gear ratio. Therefore, modulating pieces should be designed to withstand larger radial forces in CMG with a low gear ratio compared to CMG with a high gear ratio.

show abstract

“…The principal advantage of using the Maxwell stress method is that the stress distribution is solely related to the external surface of boundary with different permeability, and can be predicted. The Maxwell stress method is based on the fact that the field distribution inside a closed surface in air remains unchanged if the external sources are removed and replaced by currents and poles on the surface [12]. Thus the force, F, on a region can be calculated by integrating the force density, f, over a surface S, enclosing the region:…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Electromagnetic Force Distribution in the Armature Teeth of a Permanent Magnet DC Motor

Wang

Kano

1997

IEEJ Trans. FM

View full text Add to dashboard Cite

The torque, to some extent, is an important performance index of electric motors. In many permanent magnet DC motors, the armature core is slotted with the winding embedded into the slots. What kind of force occurs on the armature teeth (or slot) and hence forms the torque is an interesting problem. In the past some relevant researches were reported, which concluded that all torque came from the force generated in the flanks of the armature teeth, and the force on the teeth surface facing the field magnet contributed nothing to the output torque. The objective of this paper is to investigate the overall electromagnetic force distribution in the armature teeth of a permanent magnet DC motor. An U-shaped core is employed as an analytical model which covers only one tooth pitch of the slotted armature, and the derivation of the force on the surfaces of the U-shaped core is obtained by means of the Maxwell stress method. Experimental results show that both tangential force on the teeth surface facing the field magnet and normal force in the flanks of the teeth contribute to the motion of a rotor. The analytical method and force expressions are verified by the experimental results.

show abstract

Accuracy problems of force and torque calculation in FE-systems

Cited by 77 publications

References 2 publications

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

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

Analysis of Coaxial Magnetic Gear with Low Gear Ratios for Application in Counter Rotating Systems

Investigation on the Electromagnetic Force Distribution in the Armature Teeth of a Permanent Magnet DC Motor

Contact Info

Product

Resources

About