A novel brushless hybrid excited adjustable-speed eddy-current coupling

2016 ◽  
Author(s):  
Yibo Li ◽  
Heyun Lin ◽  
Hui Yang ◽  
Kaikai Guo ◽  
Shuhua Fang
Keyword(s):  
Eddy Current ◽  
Adjustable Speed ◽  
Current Coupling

Analytical Analysis of an Adjustable-Speed Permanent Magnet Eddy-Current Coupling With a Non-Rotary Mechanical Flux Adjuster

2019 ◽  
Vol 55 (6) ◽  
pp. 1-5 ◽  
Author(s):  
Yibo Li ◽  
Heyun Lin ◽  
Qiancheng Tao ◽  
Xiaoquan Lu ◽  
Hui Yang ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Eddy Current ◽  
Analytical Analysis ◽  
Adjustable Speed ◽  
Current Coupling

scholarly journals Analytical Analysis of a Novel Brushless Hybrid Excited Adjustable Speed Eddy Current Coupling

Energies ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 308 ◽  
Author(s):  
Yibo Li ◽  
Heyun Lin ◽  
Hai Huang ◽  
Hui Yang ◽  
Qiancheng Tao ◽  
...  
Keyword(s):  
Eddy Current ◽  
Eddy Currents ◽  
Core Loss ◽  
Element Analysis ◽  
Copper Loss ◽  
Faraday’S Law ◽  
Speed Regulation ◽  
Adjustable Speed ◽  
Current Coupling ◽  
Drive Systems

A novel brushless hybrid excited adjustable speed eddy current coupling is proposed for saving energy in the drive systems of pumps and fans. The topology and operation principle of the coupling are presented. Based on the real flux paths, the fluxes excited by permanent magnet (PM) and field current are analyzed separately. A magnetic circuit equivalent (MEC) model is established to efficiently compute the no-load magnetic field of the coupling. The eddy current and torque are calculated based on the proposed MEC model, Faraday’s law, and Ampere’s law. The resultant magnetic fields, eddy currents, and torques versus slip speeds under different field currents are studied by the MEC-based analytical method and verified by finite element analysis (FEA). The copper loss, core loss, and efficiency were investigated by FEA. The analytically predicted results agree well with the FEA, and the analysis results illustrate that a good speed regulation performance can be achieved by the proposed hybrid excited control.

scholarly journals General 3D Analytical Method for Eddy-Current Coupling with Halbach Magnet Arrays Based on Magnetic Scalar Potential and H-Functions

Energies ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 8458
Author(s):  
Xiaoquan Lu ◽  
Xinyi He ◽  
Ping Jin ◽  
Qifeng Huang ◽  
Shihai Yang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Eddy Current ◽  
Analytical Method ◽  
Eddy Currents ◽  
Scalar Potential ◽  
Fourier Decomposition ◽  
Field Distributions ◽  
Current Coupling ◽  
Current Calculation ◽  
Laplacian Equations

Rapid and accurate eddy-current calculation is necessary to analyze eddy-current couplings (ECCs). This paper presents a general 3D analytical method for calculating the magnetic field distributions, eddy currents, and torques of ECCs with different Halbach magnet arrays. By using Fourier decomposition, the magnetization components of Halbach magnet arrays are determined. Then, with a group of H-formulations in the conductor region and Laplacian equations with magnetic scalar potential in the others, analytical magnetic field distributions are predicted and verified by 3D finite element models. Based on Ohm’s law for moving conductors, eddy-current distributions and torques are obtained at different speeds. Finally, the Halbach magnet arrays with different segments are optimized to enhance the fundamental amplitude and reduce the harmonic contents of air-gap flux densities. The proposed method shows its correctness and validation in analyzing and optimizing ECCs with Halbach magnet arrays.

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