Design and torque calculation of permanent magnet eddy current coupling with sinusoidal torque output

Ke Chen; Hongyang Shi; Yajun Guo; Lei Yin; Ziwei Bao; Hongmei Zheng

Design and torque calculation of permanent magnet eddy current coupling with sinusoidal torque output

Vol. 23, No. 4, pp. 656-665, Apr. 2023

10.1007/s43236-023-00599-y

Sinusoidal torque

Permanent magnetic coupling

Equivalent magnetic circuit method

Abstract

Due to its unique characteristic of non-contact torque transmission between its permanent magnetic rotor and conductor rotor, permanent magnet eddy current coupling (PMECC) is preferable in transmitting torque from the outside to the inside of a sealed container, which can effectively avoid the tricky problem of dynamic seals. To mix non-uniform liquid solutions or gas mixtures in sealed containers more effectively, a sinusoidal torque is also required. Thus, permanent magnet eddy current coupling with a slotted conductor is proposed in this paper, which can adaptively output sinusoidal torque under a real-time load when the input rotational speed is constant. Based on the equivalent magnetic circuit method, an analytical model for calculating torque is proposed. When establishing the equivalent magnetic circuit model of the PMECC, the radial magnetic flux leakage circuit is added to the equivalent magnetic circuit diagram, and the cross-sectional shape of the eddy current region is equivalent to an octagon, which simplifies the torque calculation process. The analytical model is verified by finite element method (FEM) simulation and experiments. According to a comparison, the peak and lowest values of output torque obtained by the experiments, the analytical model, and the FEM simulation are consistent. The output torque waveform obtained by the analytical model and FEM simulation are also consistent.

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Cite this article

[IEEE Style]

K. Chen, H. Shi, Y. Guo, L. Yin, Z. Bao, H. Zheng, "Design and torque calculation of permanent magnet eddy current coupling with sinusoidal torque output," Journal of Power Electronics, vol. 23, no. 4, pp. 656-665, 2023. DOI: 10.1007/s43236-023-00599-y.

[ACM Style]

Ke Chen, Hongyang Shi, Yajun Guo, Lei Yin, Ziwei Bao, and Hongmei Zheng. 2023. Design and torque calculation of permanent magnet eddy current coupling with sinusoidal torque output. Journal of Power Electronics, 23, 4, (2023), 656-665. DOI: 10.1007/s43236-023-00599-y.