Numerical computation of torques in permanent magnet motors by Maxwell stresses and energy method

Marinescu, M.; Marinescu, N.

doi:10.1109/20.43957

Cited by 50 publications

(16 citation statements)

References 2 publications

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“…The electromagnetic torque and the propeller torque of the RDT are equal while ignoring the loss of the torque transmission process. Using the virtual work method, the expression of the electromagnetic torque T e of RDT motor is as follows [23,24]:…”

Section: Geometry Configurationmentioning

confidence: 99%

Analysis and Optimization of the Electromagnetic Performance of a Novel Stator Modular Ring Drive Thruster Motor

Song

Mao

et al. 2018

Energies

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Abstract:A rim driven thruster (RDT) is an integrated deep-sea motor thruster that has been widely studied. In order to improve the performance of RDT, a novel RDT motor with a modular stator is proposed in this paper. The electromagnetic performance of the new RDT motor is analyzed by the finite element method (FEM). The influence of structure parameters on the electromagnetic performance of the new RDT motor are analyzed in detail. It is shown that the effect of additional tooth width and pole arc coefficient on the electromagnetic performance of the stator modular RDT motor is significant. To obtain the optimal design with a maximum average electromagnetic torque and minimum torque fluctuation ratio, a multi-objective optimization design method combining the non-dominated sorting genetic algorithm II (NSGA-II), Kriging method and FEM is presented in this paper. A set of Pareto optimal solutions is obtained, and the optimal design point is selected from the Pareto fronts. Compared with the initial design, the average electromagnetic torque of the optimized model is improved by 16.591% and the fluctuation ratio is reduced to 3.18%.

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Section: Geometry Configurationmentioning

confidence: 99%

Analysis and Optimization of the Electromagnetic Performance of a Novel Stator Modular Ring Drive Thruster Motor

Song

Mao

et al. 2018

Energies

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“…Several different methods to calculate the torque at different rotor angular positions based on the quasi static magnetic field are presented in [2] and [3], where experimental verifications have been illustrated. The driving frequencies of magnetic force, cogging torque and commutating torque are expressed in [4] as a function of pole, teeth and phase.…”

Section: Introductionmentioning

confidence: 99%

Unbalanced Magnetic Forces in Rotational Unsymmetrical Transverse Flux Machine

Baserrah¹,

Rixen²,

Orlik³

2012

Journal of Electrical Engineering and Technology

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-The torque and unbalanced magnetic forces in permanent magnet machines are resultants of the tangential, axial and normal magnetic forces, respectively. Those are in general influenced by pole-teeth-winding configuration. A study of the torque and unbalanced magnetic forces of a small flux concentrating permanent magnet transverse flux machine (FCPM-TFM) in segmented compact structure is presented in this paper. By using FLUX3D software from Cedrat, Maxwell stress tensor has been solved. Finite element (FE-) magneto static study followed by transient analysis has been conducted to investigate the influence of unsymmetrical winding pattern, in respect to the rotor, on the performance of the FCPM-TFM. Calculating the magnetic field components in the air gap has required an introduction of a 2D grid in the middle of the air gap, whereby good estimations of the forces are obtained. In this machine, the axial magnetic forces reveal relatively higher amplitudes compared to the normal forces. Practical results of a prototype motor are demonstrated through the analysis.

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“…Initially, papers mainly focused on the calculation of the torque as the output of motor. Marinescu et al [1] and Mizia et al [2] compared the several different methods to calculate the torque. Their efforts resulted in torque calculation at several different locations based on the quasi-static magnetic field, which were verified by experiments.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Magnetic Flux Density, the Magnetic Force and the Torque in a 3D Brushless DC Motor

Pakdel¹

2009

JEMAA

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As permanent magnet motors and generators produce torque, vibration occurs through the small air gap due to the alternating magnetic forces created by the rotating permanent magnets and the current switching of the coils. The magnetic force can be calculated from the flux density by finite element methods and the Maxwell stress tensor in cylindrical coordinates. In this paper the magnetic flux density, the magnetic force and the torque of a real three dimensional brushless DC motor are simulated using Maxwell 3 D V 11.1.

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Numerical computation of torques in permanent magnet motors by Maxwell stresses and energy method

Cited by 50 publications

References 2 publications

Analysis and Optimization of the Electromagnetic Performance of a Novel Stator Modular Ring Drive Thruster Motor

Analysis and Optimization of the Electromagnetic Performance of a Novel Stator Modular Ring Drive Thruster Motor

Unbalanced Magnetic Forces in Rotational Unsymmetrical Transverse Flux Machine

Analysis of the Magnetic Flux Density, the Magnetic Force and the Torque in a 3D Brushless DC Motor

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