Analysis of eddy currents in surface layer of laminated core in magnetic bearing system using leaf edge elements

Muramatsu, Kazuhiro; Shimizu, T.; Kameari, A.; Yanagisawa, Izumi; Tokura, Sunao; Saito, Osami; Kaido, Chikara

doi:10.1109/tmag.2006.872518

Cited by 14 publications

(6 citation statements)

References 4 publications

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“…When the massive dummy tool spins rapidly in magnetic field, the dummy tool cuts magnetic induction lines, which results in intense eddy current effect at the surface of dummy tool. And the eddy current reacts to the magnetic field to weaken the magnetic field intensity; therefore the electromagnetic force reduces [27][28][29].…”

Section: Measurement Results Of Exciting Forcementioning

confidence: 99%

Measurement Research of Motorized Spindle Dynamic Stiffness under High Speed Rotating

Wang

Guo

Chen

2015

Shock and Vibration

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High speed motorized spindle has become a key functional unit of high speed machine tools and effectively promotes the development of machine tool technology. The development of higher speed and more power puts forward the stricter requirement for the performance of motorized spindle, especially the dynamic performance which affects the machining accuracy, reliability, and production efficiency. To overcome the problems of ineffective loading and dynamic performance measurement of motorized spindle, a noncontact electromagnetic loading device is developed. The cutting load can be simulated by using electromagnetic force. A new method of measuring force by force sensors is presented, and the steady and transient loading force could be measured exactly. After the high speed machine spindle is tested, the frequency response curves of the spindle relative to machine table are collected at 0~12000 rpm; then the relationships between stiffness and speeds as well as between damping ratio and speeds are obtained. The result shows that not only the static and dynamic stiffness but also the damping ratio declined with the increase of speed.

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Section: Measurement Results Of Exciting Forcementioning

confidence: 99%

Measurement Research of Motorized Spindle Dynamic Stiffness under High Speed Rotating

Wang

Guo

Chen

2015

Shock and Vibration

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“…Then we substitute Eqs. (22) and (33) for the same parameters in Eq. (35), resulting in the expression changed into…”

Section: The Deduction Of the Electromagnetic Force And Stiffnessmentioning

confidence: 99%

“…Due to the time-varying magnetic field, eddy currents exist in the stator and rotor of MBs as the rotor rotates [22][23][24][25]. In [22], the authors analyzed the eddy-current loss for design of small active magnetic bearings with solid core and rotor. Due to the high rotational speeds, eddy current losses became lager.…”

Section: Introductionmentioning

confidence: 99%

Dynamics and Stiffness Analysis of a Homopolar Magnetic Bearing

Ren¹,

Sun²,

Miao³

2019

PIER M

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Decreasing eddy current is very important for the realization of stability control of HoMB system. In order to improve the dynamic performance precision of HoMB in the design stage, the dynamics and stiffness analysis of a homopolar magnetic bearing (HoMB) has been studied in this paper. Because the polarities of the magnetic poles were not changed during the rotation of rotor, the effect of eddy-currents was often ignored in the previous researches. However, when the frequencies of vibration caused by external disturbance and control currents are very high, eddy-current effects have significant influence on the performance of HoMB. In order to predict the HoMB performance, guide the HoMB design and control of the HoMB system in high frequency, a dynamics model was built on the equivalent circuit method. Parameters of dynamic Modeling are frequency-dependent. The effect of eddy-currents on the current stiffness was studied. The analysis results show that the eddy current effect on HoMB can be reduced by increasing the air gap, decreasing the laminations thickness and decreasing the laminations conductivity.

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“…Some techniques have been proposed to deal with the iron loss problems about the laminations [4,5,6], however, the distributions of the iron loss and the magnetic flux inside the laminations are usually not known clearly. In this paper, based on a benchmark Problem 21-P21 c -M1 [7,8], a verification model is proposed, an efficient and practical nonlinear analysis is performed by subdividing only the region near the surface of lamination into a fine mesh, and by modeling the inner part of lamination as a bulk core having anisotropic conductivity.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Analysis of Leakage Flux and Iron Loss Inside Silicon Steel Laminations

Du¹

2016

IJEPE

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This paper investigates the leakage flux and the iron loss generated in the laminated silicon sheets of the core or the magnetic shields of large power transformers. A verification model is well established, and proposed parabolic model (non-saturated region) and hybrid model (saturation region) to simulate the magnetic properties of the silicon steel with different angles to the rolling direction. An efficient analysis method is implemented and validated. The calculated and measured results with respect to the test models are in good agreement.

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Analysis of eddy currents in surface layer of laminated core in magnetic bearing system using leaf edge elements

Cited by 14 publications

References 4 publications

Measurement Research of Motorized Spindle Dynamic Stiffness under High Speed Rotating

Measurement Research of Motorized Spindle Dynamic Stiffness under High Speed Rotating

Dynamics and Stiffness Analysis of a Homopolar Magnetic Bearing

Modeling and Analysis of Leakage Flux and Iron Loss Inside Silicon Steel Laminations

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