Experimental Analysis of a Coaxial Magnetic Gear Prototype

Lovato, Stefano; Barosco, Giovanni; Ortombina, Ludovico; Torchio, Riccardo; Alotto, Piergiorgio; Repetto, Maurizio; Massaro, Matteo

doi:10.3390/machines13080716

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Open AccessArticle

Experimental Analysis of a Coaxial Magnetic Gear Prototype

by

Stefano Lovato

¹

,

Giovanni Barosco

¹,

Ludovico Ortombina

¹

,

Riccardo Torchio

¹

,

Piergiorgio Alotto

¹

,

Maurizio Repetto

²

and

Matteo Massaro

^1,*

¹

Department of Industrial Engineering, Università degli Studi di Padova, Via Venezia 1, 35131 Padova, Italy

²

Department of Energy, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy

^*

Author to whom correspondence should be addressed.

Machines 2025, 13(8), 716; https://doi.org/10.3390/machines13080716

Submission received: 9 July 2025 / Revised: 4 August 2025 / Accepted: 9 August 2025 / Published: 12 August 2025

(This article belongs to the Special Issue Dynamics and Lubrication of Gears)

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Abstract

Magnetic gears are becoming promising devices that can replace conventional mechanical gears in several applications, where reduced maintenance, absence of lubrication and intrinsic overload protection are especially relevant. This paper focuses on the experimental analysis of a coaxial magnetic gear prototype recently developed at the Department of Industrial Engineering of the University of Padova. It is found that its efficiency is high and aligned with prototypes in the literature, its stationary response confirms the velocity ratio of the corresponding mechanical planetary gear, the overload protection is aligned with numerical prediction, while the dynamic response highlights that the intrinsic compliance of the magnetic coupling prevents the use of such device in high-frequency transients. It is concluded that the proposed architecture can be effectively employed for speed reducers applications where low-frequency modulation is sufficient, which includes many industrial applications. Nevertheless, high rotational speeds are allowed. The performance characteristics, although specific for the prototype considered, experimentally highlights the key features of coaxial magnetic gear devices. The experimental performance are also compared with estimations from the literature, when available.

Keywords: magnetic gear; coaxial gear; speed reducer; experimental analysis; efficiency; FRF

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MDPI and ACS Style

Lovato, S.; Barosco, G.; Ortombina, L.; Torchio, R.; Alotto, P.; Repetto, M.; Massaro, M. Experimental Analysis of a Coaxial Magnetic Gear Prototype. Machines 2025, 13, 716. https://doi.org/10.3390/machines13080716

AMA Style

Lovato S, Barosco G, Ortombina L, Torchio R, Alotto P, Repetto M, Massaro M. Experimental Analysis of a Coaxial Magnetic Gear Prototype. Machines. 2025; 13(8):716. https://doi.org/10.3390/machines13080716

Chicago/Turabian Style

Lovato, Stefano, Giovanni Barosco, Ludovico Ortombina, Riccardo Torchio, Piergiorgio Alotto, Maurizio Repetto, and Matteo Massaro. 2025. "Experimental Analysis of a Coaxial Magnetic Gear Prototype" Machines 13, no. 8: 716. https://doi.org/10.3390/machines13080716

APA Style

Lovato, S., Barosco, G., Ortombina, L., Torchio, R., Alotto, P., Repetto, M., & Massaro, M. (2025). Experimental Analysis of a Coaxial Magnetic Gear Prototype. Machines, 13(8), 716. https://doi.org/10.3390/machines13080716

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

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Experimental Analysis of a Coaxial Magnetic Gear Prototype

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