Sage Journals: Discover world-class research

Abstract

This paper focuses on the electromagnetic properties of new cylinder type twelve-pole permanent magnet eddy current coupling. By combining conventional equivalent magnetic charge method and superposition principle, the analytical calculation model of air gap magnetic field distribution for the cylinder type permanent magnet eddy current coupling is established; by considering the skin effect, the analytical model of eddy current density is set; the analytical model of electromagnetic-transfer torque is given with the demagnetization effect taken into consideration. Based on the established analytical calculation model, the variation law of air-gap magnetic induction intensity, eddy current density distribution and magnetic torque characteristic curve are analyzed and plotted in detail. At the same time, finite element simulations of the air gap magnetic field, eddy current density and electromagnetic-transfer torque are carried out based on multi-physics, and the results are compared with analytical calculations. Moreover, the paper analyzed the thickness of magnet conductive plate impacts on eddy current and explored relations between torque and coupling distance under different pole pairs. Finally, in order to verify the simulations, the prototype test of torque transfer characteristics is carried out. This paper compares the experimental results with the theoretical analysis and simulation results, and finds out the error is within the allowable range.

Keywords

Permanent magnet eddy current coupling magnetic field eddy current magnetic torque FEM

Get full access to this article

View all access options for this article.

References

Zhang

, Design and transmission performance of the main parameters of the permanent magnet eddy current coupling, Ph.D. Dissertation, HeFei University of Technology, 2013.

Nehl

T.W.

et al., Nonlinear two-dimensional finite element modeling of permanent magnet eddy current couplings and brakes, IEEE Transactions on Magnetics 30(5) (1994), 3000–3003.

Alexandrova

et al., Comparison between models for eddy-current loss calculations in rotor surface-mounted permanent magnets, in: International Conference on Electrical Machines, ICEM, 2010, pp. 1–6.

Lequesne

B.P.

et al., Eddy current machines with permanent magnets and solid rotors, IEEE Transactions on Industry Applications 33(5) (1997), 1289–1294.

Yamazaki

, Loss analysis of interior permanent magnet motors considering carrier harmonics and magnet eddy currents using 3-D FEM, IEEE Transactions on Magnetics 6(3) (2007), 389–392.

Ekram

Mahajan

Fazil

and Patwardhan

, Design optimization of brushless permanent magnet hub motor drive using FEA, in: Proceeding of International Conference on Electrical Machines and Systems, 2007, pp. 1476–1480.

Zhao

X.B.

and Ji

C.Y.

, Analysis of flux leakage in novel permanent magnet type eddy current retarder for vehicle applications, in: IEEE Vehicle Power and Propulsion Conference, 2008, pp. 1–4.

Kong

F.Y.

Wang

Z.Q.

Zhang

H.L.

and Gao

C.L.

, Analysis of magnetic field and performance calculation of magnetic pump coupling, Journal of Magnetic Materials and Devices 4(3) (2009), 24–27.

Kou

Z.Q.

et al., Analysis of eddy current loss in axial permanent magnet coupling, in: International Conference on Mechatronics and Automation Mechatronics and Automation, 2009, pp. 1947–1951.

10.

Wang

and Wang

D.Z.

, Calculation of eddy current loss and thermal analysis for adjustable permanent magnetic coupler, Electronic and Mechanical Engineering and Information Technology 9(1) (2011), 4405–4408.

11.

Yuan

D.Q.

and Wang

L.L.

, Finite element analysis of eddy current field of magnetic coupling with Halbach array, in: Communications and Networks in International Conference on Consumer Electronics, 2011, pp. 354–357.

12.

Yang

C.J.

and Gu

H.W.

, Development status and Prospect of permanent magnetic drive technology, Journal of Mechanical Transmission 2(3) (2008), 1–4.

13.

Tang

R.Y.

Han

X.Y.

and Zhou

, Research and multi-physical fields analyses of rare earth permanent magnet electrical machines in China, International Journal of Applied Electromagnetics and Mechanics 33(1) (2010), 3–23.

14.

Mahmoudi

et al., An analytical complementary FEA tool for optimizing of axial-flux permanent-magnet machines, International Journal of Applied Electromagnetics and Mechanics 37(1) (2011), 19–34.

15.

Bracikowski

et al., Multi-physics design rules using lumped models for a permanent magnet synchronous machine, International Journal of Applied Electromagnetics and Mechanics 43(1,2) (2013), 13–23.

16.

Sun

Z.S.

et al., Study on the magnetic field analysis and characteristics of tubular permanent magnet speed governor, China Mechanical Engineering 26(13) (2015), 1742–1746.

Electromagnetic properties of cylinder permanent magnet eddy current coupling

Abstract

Keywords

Get full access to this article

References