Investigation of Magnetic Fields and Forces Arising in Closed- and Open-Circuit-Type Magnetic Suspension Systems.
Final technical rept.,
MECHANICAL TECHNOLOGY INC LATHAM NY RESEARCH AND DEVELOPMENT DIV
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Magnetic bearings can employ either closed- or open-type magnetic circuits. A theory that was developed, for predicting forces and fluxes in closed-circuit-type magnetic systems employing high-permeability material was reported earlier. This theory had only been validated through measurements under static conditions. In this work, several aspects of both closed- and open-circuit-type magnetic systems have been studied. Dynamic measurements of forces and fluxes have been made in a closed magnetic circuit to detect any possible effects due to a transverse oscillation of one of the members forming the magnetic circuit. Although the measurements discovered some degradation of transverse forces with frequency, the phase angle measured between the force and the displacement indicated very little damping in the system. Towards the study of open-circuit magnetic systems, a theory has been developed for predicting repulsive forces normal and transverse between high coercivity permanent magnets. This theory has been based on the mathematical modeling of permanent magnets by their equivalent current densities. The analytical results have been compared with repulsive forces measured between two rectangular parallelopiped-shaped magnets, and an excellent agreement has been found.
- Machinery and Tools
- Electricity and Magnetism