Literature survey of eddy-current loss analysis in rotating electrical machines

Jassal, A.; Polinder, H.; Ferreira, J.A.

doi:10.1049/iet-epa.2011.0335

Cited by 22 publications

(20 citation statements)

References 97 publications

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“…Eddy currents also produce torques on spinning conductors in the presence of a magnetic field [21][22][23]. A conductor that rotates with angular velocity ω in a magnetic field generates eddy currents with current density s = J E, where the motional electric field =É v B relies on the rotational velocity ω ρ =v of a point in sphere 2, located relative to the sphere center by the position vector ρ [24].…”

Section: Eddy Currentsmentioning

confidence: 99%

Dynamical interactions between two uniformly magnetized spheres

Edwards

2016

Eur. J. Phys.

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Studies of the two-dimensional motion of a magnet sphere in the presence of a second, fixed sphere provide a convenient venue for exploring magnet-magnet interactions, inertia, friction, and rich nonlinear dynamical behavior. These studies exploit the equivalence of these magnetic interactions to the interactions between two equivalent point dipoles. We show that magnet-magnet friction plays a role when magnet spheres are in contact, table friction plays a role at large sphere separations, and eddy currents are always negligible. Webbased simulation and visualization software, called MagPhyx, is provided for education, exploration, and discovery.

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Section: Eddy Currentsmentioning

confidence: 99%

Dynamical interactions between two uniformly magnetized spheres

Edwards

2016

Eur. J. Phys.

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“…), T z is the friction torque caused by the rotor's axial movement (10),ż is the rotor's axial velocity, m r is the mass of the rotor, F z (i 1 , i 2 , θ) is the axial force for the current rotor position (defined in a similar way to the torque), g is the acceleration due to gravity (in current application the motor's axis lays in horizontal plane (Fig. 5)), μ r is the coefficient of friction between the plain brass bearing and the stainless-steel shaft, c sw is the spring-washer spring constant, B r is the rotational movement damping constant (for more information on damping properties please see [12,16,[23][24][25][26][27]), B a is the axial movement damping constant and z is the axial displacement of the rotor. Spring washers help maintain the axial position of the rotor, and so contribute to the good vibro-acoustic aspects of the product.…”

Section: Computation Of the Rotor's Dynamic Responsementioning

confidence: 99%

Numerical modelling of the rotor movement in a permanent‐magnet stepper motor

Škofic

Boltežar

2014

IET Electric Power Applications

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This manuscript deals with predicting the dynamic behavior of the rotor in a claw-poled, permanent-magnet (PM), stepper motor. The FEM model of a prototype stepper is used to calculate the magnetic forces on the rotor, where the PM is modeled with an altered geometry approach. This altered geometry helps achieving a realistic magnetic flux density profile and direct PM material property input. The obtained forces are used in the following analysis as the excitation, to simulate the rotor's rotational and also axial movements with the help of proposed system of equations. To validate the introduced modeling approach, a measurement of the rotational and axial movement was performed on a motor with the same geometry and material properties. The results of the simulated movement are in good agreement with the experimental data for the tested motor.

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“…the free space between the rotor and the stator, can not be as small as that in conventional machines. Otherwise, higher-than-accepted losses will be induced in the rotor, including eddy current losses in the electromagnetic (EM) shield and the cryostat wall [12], [13], and also AC losses in the HTS field winding [14].…”

Section: Introductionmentioning

confidence: 99%

Investigation Into Multi-Phase Armature Windings for High-Temperature Superconducting Wind Turbine Generators

Liu

Song

Deng

et al. 2020

IEEE Trans. Appl. Supercond.

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High-temperature superconducting (HTS) generators are being considered as a competitive candidate in large direct-drive (DD) wind turbines because of their features of being lightweight and compact. Normally a large air gap is inevitable in partially HTS generators, sacrificing the torque producing capability. In this paper, multi-phase armature windings for HTS generators are investigated to reduce the air gap length in HTS generators while not compromising generators' performance. Therefore, the torque density of HTS generators can be improved without any added costs. Five different multi-phase armature winding schemes are studied in the paper. Their performance regarding torque production and rotor losses in a 10 MW DD HTS generator are examined. The findings show that employing multi-phase armature windings can reduce the mechanical air gap without generating extra eddy current losses in the rotor, and the torque production can be improved by up to 9.1%. In addition, the alternating magnetic field reaching the HTS field winding are also reduced by using multi-phase armature windings, resulting in lower AC losses and cooling costs.

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Literature survey of eddy-current loss analysis in rotating electrical machines

Cited by 22 publications

References 97 publications

Dynamical interactions between two uniformly magnetized spheres

Dynamical interactions between two uniformly magnetized spheres

Numerical modelling of the rotor movement in a permanent‐magnet stepper motor

Investigation Into Multi-Phase Armature Windings for High-Temperature Superconducting Wind Turbine Generators

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