Magnetic field and eddy current losses in linear and rotating permanent magnet machines with a large number of poles

Liu, Z.J.; Vourdas, A.; Binns, K.J.

doi:10.1049/ip-a-3.1991.0043

Cited by 33 publications

(13 citation statements)

References 4 publications

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“…Therefore, the amplitude of air gap flux density is large, adjustable, and efficient [9]. Moreover, the device structure can be classified as radial [10], [11], axial [12]- [15], or linear [16]- [18].…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design of Hybrid Excitation Linear Eddy Current Brake

2014

IEEE Trans. Energy Convers.

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This paper presents a novel parallel magnetic path hybrid excitation linear eddy current brake. The eddy current brake using parallel magnetic path scheme with the presence of the PMs, whose flux lines in the primary are oppositely directed with respect to the flux lines by the excitation windings, has the effect of mitigating the saturation of the iron in the teeth of the primary. This allows the brake to be fed with more intense currents improving the braking force. The structure and working principle are introduced. The analytical model was found using the equivalent magnetic circuit method and the layer theory approach. The design method of the eddy current brake was studied using the finite element method. Compared with traditional induction motors and synchronous motors, the design method of the eddy current brake has not been proposed. Therefore, in this paper, the design parameters of the hybrid excitation linear eddy current brake were gradually determined by consulting the design method of the linear induction motor and linear synchronous motor, and a design flowchart was proposed. Finally, a prototype of hybrid excitation linear eddy current brake was created and an experimental study of the eddy current brake was conducted.Index Terms-Braking force analysis, design method, eddy current brake, experimental study, hybrid excitation.

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Section: Introductionmentioning

confidence: 99%

Analysis and Design of Hybrid Excitation Linear Eddy Current Brake

2014

IEEE Trans. Energy Convers.

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“…On the basis of this idea, a magnet charge enantiomorphism method (Xiong and Nasar, 1989) has been used to set up planar analytic magnet field distribution method in planar reference frame to analyse side and planar permanent magnet linear motor. On the basis of magnet vector, planar magnetic field distribution (Liu et al, 1991;Trumper et al, 1996) has been built up. In the reference of Wang et al (1999), magnet distribution of TPMLSM has been shown as the result of magnet vector analysis, including thrust forces and EMF as well as winding inductance.…”

Section: Introductionmentioning

confidence: 99%

An analytic calculation method of the magnet field in Tubular Permanent Magnet Linear Synchronous Motor (TPMLSM)

Zhao

Zhang

Gao

2011

IJCAT

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Analytic magnetic field calculation method is introduced which is based on scalar magnetic potential with Schwarz-Christoffel Transform of axial magnetised TPMLSM. The results of magnetic field distribution are obtained in slotless and slotted motor. Finite element method is used to testify the magnetic field distribution, there is almost no difference in the error results of in narrow airspace slotless and slotted motor, but the value is equal to the middle winding flux density in wider airspace slotless motor. Finally, the results of the slotless prototype magnetic field distribution with zero load are given; it is verified that the analysis and design prototype are correct.

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“…As such, some authors have investigated eddy-current losses in a plate [6], [7]. Commonly, a finite-element analysis is used to investigate iron losses in solid structures, for example, a PM motor with solid armature [8]. Additionally, also finite-element model validations have been implemented (e.g., [9] describes the analysis of a setup with PMs and an aluminum rotor).…”

Section: Iron Loss In Solid Back Ironmentioning

confidence: 99%

Eddy-Current Losses in Laminated and Solid Steel Stator Back Iron in a Small Rotary Brushless Permanent-Magnet Actuator

2008

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The ever-increasing necessity to miniaturize smooth torque rotary actuators has placed severe constraints on the current slotless permanent-magnet technology. These constraints are mainly the consequence of the relatively large effective magnetic airgap which limits the achievable magnetic loading and, therefore, the torque density of slotless permanent-magnet rotary actuators. Further, the miniaturization has to be achieved at ever-decreasing costs and, therefore, it would be advantageous to implement solid back irons. However this, even at reduced magnetic loading, still results in considerable eddy-current losses. Therefore, a careful selection of the various actuator dimensions and most appropriate soft magnetic laminated or solid material is a prerequisite for applications that require smooth speed and torque characteristic. This paper will identify the influence of various parameters of the slotless permanent-magnet actuator on the eddy-current loss in the back iron using both 2-D and 3-D finite-element analysis.

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Magnetic field and eddy current losses in linear and rotating permanent magnet machines with a large number of poles

Cited by 33 publications

References 4 publications

Analysis and Design of Hybrid Excitation Linear Eddy Current Brake

Analysis and Design of Hybrid Excitation Linear Eddy Current Brake

An analytic calculation method of the magnet field in Tubular Permanent Magnet Linear Synchronous Motor (TPMLSM)

Eddy-Current Losses in Laminated and Solid Steel Stator Back Iron in a Small Rotary Brushless Permanent-Magnet Actuator

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