Evaluation and comparison of different numerical computation methods for the electromagnetic torque in electrical machines

Silwal, Bishal; Rasilo, Paavo; Perkkiö, Lauri; Hannukainen, Antti; Eirola, Timo; Arkkio, Antero

doi:10.1109/icems.2013.6713137

Cited by 4 publications

(3 citation statements)

References 15 publications

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“…In FEM numerical calculations of magnetic circuits, the Coulomb and the Maxwell stress tensor methods are the most frequently used approaches to determine the electromagnetic torque value [6,12,15,19,20]. A high accuracy of results can also be obtained using the method proposed by Arkkio, based on the Maxwell stress tensor method [11,21,22].…”

Section: Numerical Model Of the Line-start Reluctance Motormentioning

confidence: 99%

Analysis of Selected Operating States of the Line Start Synchronous Reluctance Motor Using the Finite Element Method

Idziak

Kowalski

2021

Energies

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The article presents the results of work on an effective numerical study of selected transient states of a low-power electrical machine. The object of detailed research was a synchronized squirrel-cage induction motor. Its ability to work at a synchronous speed was enabled by obtaining reluctance torque, caused by an imposed asymmetry between the direct and quadrature reluctances of the rotor. The difference between the reluctances was achieved by changing the rotor geometry by milling additional deep grooves. The modifications of the rotor did not damage the continuity of the rotor cage. Imposed lots were arranged symmetrically around the rotor circumference. In order to study the performance of the modified motor, a parameterized, numerical model of the machine was developed to evaluate the impact of the geometry of the slots. The developed three dimensional (3D) model of the electromagnetic phenomena in the studied magnetic circuit employs the finite element method (FEM). The model takes into account the saturation of the machine’s magnetic circuit and the skew of the rotor cage bars as well as the mechanical equilibrium of the terrain system including the moment of inertia and frictional torque in the bearings as well as the load torque resulting from the operation of the internal fan. The simulation study concerned the starting process of the machine under different values of the load. The influence of the supply voltage phase angle at the moment of start-up and the initial position of the rotor in relation to the stator was investigated. In order to calibrate the model, tests of the physical object were performed. The corrections introduced concerned the magnetization characteristics of the magnetic circuit. The results obtained confirm the correctness of the adopted strategy of testing the operational properties of the considered engine.

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Section: Numerical Model Of the Line-start Reluctance Motormentioning

confidence: 99%

Analysis of Selected Operating States of the Line Start Synchronous Reluctance Motor Using the Finite Element Method

Idziak

Kowalski

2021

Energies

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“…Also, because the elements in the air-gap are geometrically distorted or re-meshed to accommodate arbitrary movement, the results often have an oscillating error component. 5 It has been shown that this problem can be drastically reduced by using higher order elements in the moving band. 13 However, the use of higher order elements increases the density of the element, and the computational time will substantial increase as the case of the air-gap element method.…”

Section: Introductionmentioning

confidence: 99%

“…The movement is accomplished by a simple recalculation of the Fourier series without any modification of the mesh structure, resulting in simple and efficient time-stepping. [5][6][7] The results can be very accurate because of the high order of the field representation in the air-gap region. 8 But for the insertion of dense matrix blocks into the sparse finite element matrices, the computational time is substantially increased.…”

Section: Introductionmentioning

confidence: 99%

The treatment of moving problem for constant-frequency double-rotor generator in finite element analysis

Jiang

Zhang

Cheng

2015

Advances in Mechanical Engineering

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The constant-frequency double-rotor generator has the potential to be used in the marine energy conversions, such as tides and marine current power generation system due to the advantages. However, there are two different rotational speed movement boundaries in the constant-frequency double-rotor generator, especially the inner moving part boundary between the inner wound rotor and outer permanent magnet rotor. This complicates the finite element analysis and greatly increases the analysis time. In this article, a new finite element analysis method based on double boundaries interpolation multiple reference frame is proposed. The principle of the interpolation multiple reference frame method is introduced, and the analysis and comparison with the traditional method are carried out. The analysis results show that the interpolation multiple reference frame method simplifies the preprocessing procedure, reduces computation time, ensures high calculation accuracy, and has the potential to be applied in all kinds of multiple mechanical port machines.

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Computation of Torque of an Electrical Machine With Different Types of Finite Element Mesh in the Air Gap

et al. 2014

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Evaluation and comparison of different numerical computation methods for the electromagnetic torque in electrical machines

Cited by 4 publications

References 15 publications

Analysis of Selected Operating States of the Line Start Synchronous Reluctance Motor Using the Finite Element Method

Analysis of Selected Operating States of the Line Start Synchronous Reluctance Motor Using the Finite Element Method

The treatment of moving problem for constant-frequency double-rotor generator in finite element analysis

Computation of Torque of an Electrical Machine With Different Types of Finite Element Mesh in the Air Gap

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