Analytical study of radial stability of permanent-magnet synchronous couplings

Magnetic couplings are used to transmit a torque through a magnetic separation wall without any mechanical contact between the two rotors. But the usual cylindrical-airgap magnetic coupling is radially unstable. This instability can be computed from the analytical formulas of the force components ex...

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Bibliographic Details
Published in:IEEE transactions on magnetics 1999-07, Vol.35 (4), p.2133-2136
Main Authors: Elies, P., Lemarquand, G.
Format: Article
Language:English
Subjects:
Applied sciences
Contact
Couplings
Electric motors
Electrical engineering. Electrical power engineering
Electrical machines
Exact sciences and technology
Filters
Geometry
Instability
Joining
Magnetic analysis
Magnetic separation
Magnetization
Mathematical analysis
Permanent magnets
Stability
Stability analysis
Synchronous
Torque
Vibrations
Walls
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Summary:Magnetic couplings are used to transmit a torque through a magnetic separation wall without any mechanical contact between the two rotors. But the usual cylindrical-airgap magnetic coupling is radially unstable. This instability can be computed from the analytical formulas of the force components exerted between two magnets. The instability can then be analyzed. We present a structure for an astable coupling. Such a coupling does not generate any radial force when a radial displacement occurs. It is a perfect mechanical filter.
ISSN:0018-9464
1941-0069
DOI:10.1109/20.774183