Electricity: measuring and testing – Magnetic – Permanent magnet testing
Patent
1976-08-02
1978-08-01
Corcoran, Robert J.
Electricity: measuring and testing
Magnetic
Permanent magnet testing
361147, G01R 3312
Patent
active
041045912
ABSTRACT:
An element together with a prospective shunt load is magnetized to become a permanent magnet whereafter the magnet is stepwise demagnetized, actually along the demagnetization curve but due to load along a load line passing through a point inside the demagnetization curve independently from any variations thereof. This point will serve as operating point of the magnet in the system and the load line is characterized by identifying the operating point establishing a minimum induction on the basis of the shunt so that during normal operation of the magnet in a system smaller flux will not be extracted. The demagnetization steps are tracked by interspersed measuring steps to monitor approach of the desired operating point. The system is preferable a relay and magnetization, demagnetization, measurement and termination are carried out in a different, closed loop system.
REFERENCES:
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patent: 2806186 (1957-09-01), Brown et al.
patent: 3235776 (1966-02-01), Ireland
patent: 3242386 (1966-03-01), Avery et al.
patent: 3243696 (1966-03-01), Lovell et al.
patent: 3479584 (1969-11-01), Casey
patent: 3596144 (1971-07-01), Cunningham
Corcoran Robert J.
Elmeg Elektro-Mechanik GmbH
Siegemund Ralf H.
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