A Rotary Magnetic Damper or Brake Consisting of a Number of Sector Magnets and a Circular Conductor

[+] Author and Article Information
Kosuke Nagaya

Department of Mechanical Engineering, Gunma University, Kiryu, Gunma 376, Japan

Yasuo Karube

Canon Inc., Shinjuku, Nishishinjuku 2-7-1, Tokyo 160, Japan

J. Dyn. Sys., Meas., Control 111(1), 97-104 (Mar 01, 1989) (8 pages) doi:10.1115/1.3153024 History: Received August 14, 1984; Online July 21, 2009


This paper is concerned with a method for analyzing a rotary magnetic damper (eddy current brake) consisting of a number of sector magnets and a circular conductor. The analytical solution to obtain an eddy current, a braking force, and a damping coefficient is obtained by dividing the magnetic flux into the narrow sectors. Numerical calculations have been carried out for the variation of the flux range, the position, and the number of the magnets. Experimental tests are also carried out to verify the present theoretical results. The theoretical results are in good agreement wtih the experimental ones.

Copyright © 1989 by ASME
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