Cycloidal Magnetic Gear Speed Reducer


A cycloidal speed reducer employing gears with permanent magnets acting as teeth is described. The magnets, which have their axes radially oriented in both the orbiting gear and the fixed internal gear, are inserted in holes drilled in nonmagnetic rims without protruding from the cylindrical exposed surfaces. Because the orbiting gear is not restrained radially, it contacts the fixed gear and rolls on its inner surface. A normal force is developed at the contact point between the gears to balance the magnetic attraction and the centrifugal force of the orbiting gear. The friction available due to this normal force increases the transmission’s torque capacity, which is further increased by elimination of the gap between the gears. Also, the radial load on the supporting orbiting gear bearing is eliminated. A prototype with a reduction ratio of 26 is being tested.

Share and Cite:

Chicurel-Uziel, R. (2013) Cycloidal Magnetic Gear Speed Reducer. Modern Mechanical Engineering, 3, 147-151. doi: 10.4236/mme.2013.34021.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] P. O. Rasmussen, et al, “Development of a High Performance Magnetic Gear,” IEEE Transactions on Industry Applications, Vol. 41, No. 3, 2005, pp. 764-770.
[2] F. T. Jorgensen, et al, “The Cycloid Permanent Magnetic Gear,” IEEE Transactions on Industry Applications, Vol. 44, No. 6, 2008. pp. 1659-1665.
[3] T. B. Martin Jr., “Magnetic Transmission,” US Patent No. 3,378,710, 1968.
[4] W. J. Mabe Jr., “Magnetic Transmission,” U.S. Patent No. 5,013,949, 1991.
[5] C. P. Cho and R. A. Bedingfield, “Permanent Magnet Torque/Force Transfer Apparatus,” Patent No. 5,569,111, 1996.
[6] G. Valmor da Cunha, “Orbital Magnetic Speed Change,” US Patent No. 8,210,980 B2, 2012.
[7] K. Atallah, “Magnetic Gear,” US Patent No. 7,973,441 B2, 2011.
[8] L. A. Vazquez-Perez, “Diseno y Construccion de un Redactor de Velocidad Cicloidal Magnetico Balaqnceado,” Master’s Degree Thesis, Universidad Nacional Autonoma de Mexico, 2013.

Copyright © 2023 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.