Armature Reaction Field and Inductance of Coreless Moving-Coil Tubular Linear Machine

Yan, Liang; Zhang, Lei; Zhang, Jiao; Hu, Hongjie; Chen, Chin-Yin; Chen, I‐Ming

doi:10.1109/tie.2014.2321336

Cited by 81 publications

(19 citation statements)

References 35 publications

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“…Its performance affects the energy utilization efficiency of the FPEG. Many researchers have been working on the design of the linear motor for an FPEG [5][6][7]. Wang [8] proposed and designed a three-phase moving-magnet Electronics 2020, 9, 621 3 of 11 linear motor for the application of an FPEG.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Loss Analysis of a Linear Motor System Designed for a Free-Piston Engine Generator

Yang

et al. 2020

Electronics

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A free-piston engine generator is a new type of power generating device, which has the advantages of high efficiency and simple structure. In this paper, a linear motor system composed of a moving-coil linear motor with axial magnetized magnets and a H-bridge pulse-width modulation (PWM) rectifier is designed for portable free-piston engine generators. Based on the finite-element model of the motor and physical model of the rectifier, the combined electromagnetic model is presented and then validated by the prototype-tested results. The electromagnetic processes of the linear motor system are simulated. The electromagnetic losses during the standard working cycle are analyzed. Under the rated reciprocating frequency of 50 Hz and the rated reciprocating stroke of 36 mm, the mechanical-to-electrical energy conversion efficiency of 86.3% can be obtained by the linear motor system, which meets the requirement of portable free-piston engine generators.Electronics 2020, 9, 621 2 of 11 mover assembly moves down from the TTC to BTC driving by the combustion pressure.During the stable running, the linear motor works in generating mode all the time. The electromotive force (EMF) in the coil of the motor is quasi-sine wave, and the generating current in the coil is controlled as standard sine wave by the rectifier, and the electrical energy will be stored in the battery in the form of direct current. During the starting of the device, the linear motor must work briefly in motoring mode to start the motion of the piston-mover assembly.

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Section: Introductionmentioning

confidence: 99%

Electromagnetic Loss Analysis of a Linear Motor System Designed for a Free-Piston Engine Generator

Yang

et al. 2020

Electronics

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“…Owing to various advantages, the analytical method is still preferred for the initial design and optimization, although the widely used numerical methods can easily take into account the complicated geometry and iron saturation. The analytical method has been widely applied in the field analysis of LPMSMs, such as LPMSMs with the slot and end effects neglected [6][7][8][9], and coreless LPMSMs [10], [11]. However, when the slot and end effects must be considered, the analytical modeling becomes rather complicated.…”

Section: Introductionmentioning

confidence: 99%

No-Load Magnetic Field and Cogging Force Calculation in Linear Permanent-Magnet Synchronous Machines With Semiclosed Slots

Zhao

Liu

et al. 2017

IEEE Trans. Ind. Electron.

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Abstract-This paper presents an improved analytical subdomain model for predicting the magnetic field in linear permanent magnet synchronous machines (LPMSMs) with semi-closed slots accounting for the finite length of primary iron core and secondary back-iron. The whole field domain is divided into eight subdomains and the magnetic field in each subdomain is solved by applying the variable separation method, adequate boundary conditions and interface conditions. In this model, both the slot and end effects are considered. The thrust and normal forces are calculated by the Maxwell stress theory. The finite element analysis is carried out to validate the analytical model. Finally, an LPMSM prototype is manufactured and tested. The experimental results show that the developed analytical model has high accuracy for predicting the magnetic field and forces.Index Terms-Linear PM machines, improved analytical model, slot effect, end effect.

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“…In [7], [16]- [17], [19], the longitude end effect is considered by MEC method and there is a relatively large error compared with FEM. In [23], the armature reaction field in move-coils PMLSM with finite motor length is calculated by analytical model based on harmonic expansion and permeance model. In [24], to consider the primary end effect, an enlarged slot is added to the end of iron yoke and then periodic boundary is imposed.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Field and Force Calculation in Linear Permanent-Magnet Synchronous Machines Accounting for Longitudinal End Effect

Zhao

Liu

et al. 2016

IEEE Trans. Ind. Electron.

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This paper presents an improved analytical method for predicting the magnetic field and forces in linear permanent magnet synchronous machines (LPMSMs) accounting for both the primary end effect and secondary end effect. So far, the magnetic field calculation of LPMSM in most studies is conducted in Cartesian coordinate, whereas the end effect is neglected by applying periodic boundary. In this paper, to implement the analytical model, a polar presentation of the machine geometry is proposed and subdomain method is applied to calculate the magnetic field. Then, according to the developed model, the tangential thrust and normal force are calculated based on Maxwell stress theory. Numerical result is subsequently obtained by finite element method and employed to validate the analytical model. Finally, an LPMSM prototype is manufactured and experiments are conducted. The results show that the developed analytical model has high accuracy for predicting the magnetic field and forces. Index Terms-Linear PM machines, improved analytical model, magnetic field, force.

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Armature Reaction Field and Inductance of Coreless Moving-Coil Tubular Linear Machine

Cited by 81 publications

References 35 publications

Electromagnetic Loss Analysis of a Linear Motor System Designed for a Free-Piston Engine Generator

Electromagnetic Loss Analysis of a Linear Motor System Designed for a Free-Piston Engine Generator

No-Load Magnetic Field and Cogging Force Calculation in Linear Permanent-Magnet Synchronous Machines With Semiclosed Slots

Magnetic Field and Force Calculation in Linear Permanent-Magnet Synchronous Machines Accounting for Longitudinal End Effect

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