The eddy-current analysis and transmit-torque calculation for the permanent eddy-current coupling based on the equivalent-depth method

Gao, Qingzhong; Wang, Dazhi; Lin, Sheng; Xu, Fang

doi:10.1109/icma.2014.6885890

“…The PMEC is composed of a permanent magnet (PM) rotor and a conductive sheet (CS) rotor. Based on the principle of electromagnetic induction, the slip speed between the two rotors can generate an induced eddy current in the CS, and the induced magnetic field generated by the current can interact with the magnetic field generated by the PM to produce torque [3,4]. Stepless speed regulation can be realised by changing the coupling area or air gap between the two rotors.…”

Section: Introductionmentioning

confidence: 99%

“…The axial-flux PMECs have larger rotational inertia and lower alignment requirements, but they will generate axial force, which reduces their bearing life [12]. Additionally, innovative structures have been developed based on these designs, such as the double-sided radial-flux type [5,[13][14][15], double-sided axial-flux type [3,16] and radial-axial combined type [17,18]. Mohammadi et al presented an analytical model of double-sided PMECs with two layers of PMs and carried out sensitivity analysis to investigate the influence of the design variables on the characteristics of the coupler [19].…”

Section: Introductionmentioning

confidence: 99%

“…Aberoomand extracted and optimised the analytical model of double-sided axial PMECs [2]. Yang et al [16] and Gao et al [3] used the equivalent magnetic circuit (EMC) method and vector potential method, respectively, to establish different analytical models of double-sided axial PMECs and carried out experimental verification. The primary advantage of the double-sided axial PMEC is its ability to reduce the axial force exerted on the bearings by a single-side PM rotor, thereby minimising the damage and increasing the torque density.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Modelling and analysis of the intersecting axis permanent magnet eddy‐current coupler

Luo,

Liu,

Pu

et al. 2024

IET Electric Power Appl

0

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The permanent magnet eddy‐current coupler (PMEC) is a kind of non‐contact, stepless speed regulation device and has been widely used in transmissions. However, the current PMECs are coaxial and cannot achieve transmission and speed regulation in intersecting axes. An intersecting‐axis permanent magnet (PM) eddy current coupler (IPMEC), which consists of a disk‐type PM rotor and a barrel‐type conductive sheet (CS) rotor arranged with intersecting axes, is proposed. It generates eddy currents through the speed difference between the two rotors and uses the non‐contact electromagnetic force between the eddy currents and permanent magnets to transmit torque. During operation, the speed can be adjusted by altering the coupling area or air gap. A theoretical model of the IPMEC based on the equivalent magnetic circuit method is presented and verified by finite element simulation using ANSYS. Then, the effects of the pole number of the PMs, the radius of the CS rotor and the PM rotor on the performance were analysed, and the design method of the IPMEC was proposed. This study can be used to expand the application range of PMECs.

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“…To obtain the electromagnetic performance of the PMEC, the analytical method was extensively investigated in the past. The 3D magnetic structure of the PMEC is simplified with the 2D magnetic circuit for the magnetic field calculation and performance prediction, and the combination of the analytical method and the finite element method (FEM) was proposed, [12][13][14][15][16]. The eddy current loss produced in the copper ring is the main heat source of PMEC, and obtaining the accurate eddy current loss is the basis for the temperature field calculation.…”

mentioning

confidence: 99%

Analysis and Design Optimization of Axial–Radial Flux Hybrid Excitation Permanent Magnet Eddy Current Coupling

Zhang

¹

,

Liu

²

,

Zhang

³

et al. 2023

J. Electr. Eng. Technol.

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This paper proposes an axial-radial flux hybrid excitation permanent magnet eddy current coupling (HE-PMEC), where the ferrite magnet is employed for producing the radial flux and the DC excitation current is adopted for producing the axial flux. Moreover, a shielding layer is developed to regulate the radial magnetic field. Its magnetic field distribution, electromagnetic performance, and temperature distribution are calculated based on the 3D finite element method (FEM). By adjusting the applied DC excitation current density and the insertion depth of the shielding layer, the variable current starting process, the variable current braking process, and the speed regulation characteristic of the proposed HE-PMEC are obtained. It can be seen that the starting process, braking process, and speed regulation ability of the HE-PMEC have been enhanced greatly. Furthermore, the copper ring shape of the HE-PMEC is optimized by using the proposed improved multilevel optimization method. It can be seen that the performance of the HE-PMEC can be improved by using the new optimized copper ring shape. Lastly, compared with the conventional PMECs, the proposed HE-PMEC has shown its superior electromagnetic performance.

show abstract

“…To obtain the electromagnetic performance of the PMEC, the analytical method was extensively investigated in the past. The 3D magnetic structure of the PMEC is simplified with the 2D magnetic circuit for the magnetic field calculation and performance prediction, and the combination of the analytical method and the finite element method (FEM) was proposed, [12][13][14][15][16]. The eddy current loss produced in the copper ring is the main heat source of PMEC, and obtaining the accurate eddy current loss is the basis for the temperature field calculation.…”

mentioning

confidence: 99%

Analysis and Design Optimization of Axial- Radial Flux Hybrid Excitation Permanent Magnet Eddy Current Coupling

Zhang

¹

,

Liu

²

,

Zhang

³

et al. 2022

Preprint

0

View full text Add to dashboard Cite

This paper proposes an axial-radial flux hybrid excitation permanent magnet eddy current coupling (HE-PMEC), where the ferrite magnet is employed for producing the radial flux and the DC excitation current is adopted for producing the axial flux. Moreover, a shielding layer is developed to regulate the radial magnetic field. Its magnetic field distribution, electromagnetic performance, and temperature distribution are calculated based on the 3D finite element method (FEM). By adjusting the applied DC excitation current density and the insertion depth of the shielding layer, the variable current starting process, the variable current braking process, and the speed regulation characteristic of the proposed HE-PMEC are obtained. It can be seen that the starting process, braking process, and speed regulation ability of the HE-PMEC have been enhanced greatly. Furthermore, the copper ring shape of the HE-PMEC is optimized by using the proposed improved multilevel optimization method. It can be seen that the performance of the HE-PMEC can be improved by using the new optimized copper ring shape. Lastly, compared with the conventional PMECs, the proposed HE-PMEC has shown its superior electromagnetic performance.

show abstract

The eddy-current analysis and transmit-torque calculation for the permanent eddy-current coupling based on the equivalent-depth method

Cited by 4 publications

References 7 publications

Modelling and analysis of the intersecting axis permanent magnet eddy‐current coupler

Modelling and analysis of the intersecting axis permanent magnet eddy‐current coupler

Analysis and Design Optimization of Axial–Radial Flux Hybrid Excitation Permanent Magnet Eddy Current Coupling

Analysis and Design Optimization of Axial- Radial Flux Hybrid Excitation Permanent Magnet Eddy Current Coupling

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