Moving magnet meter having a closed magnetic circuit rotor

Details Moving magnet meter having a closed magnetic circuit rotor Moving magnet meter having a closed magnetic circuit rotor

1976-11-04

1978-05-16

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With electromagnetic field

324147, G01R 514

Patent

active

040901319

ABSTRACT:
There is disclosed a moving magnet meter of inexpensive construction which has the greater sensitivity, linearity and immunity from extraneous fields of moving coil meters. The rotor consists of a closed magnetic circuit through which a permanent magnet flux flows. The flux intersects the turns of a stationary coil through which the current to be measured flows, part of the closed magnetic circuit rotating within the coil. The strength and area of the permanent magnet flux which intersects the coil is substantially constant throughout an operating angle for the rotor of at least 90.degree.. The return torque for the rotor is derived from a stationary permanent magnet which interacts with the rotor flux and provides a return torque which varies linearly with the rotor angle.

REFERENCES:
patent: 2439970 (1948-04-01), Fox
patent: 2710377 (1955-06-01), Pfeffer
patent: 2968000 (1961-01-01), Pfeffer
patent: 3094659 (1963-06-01), Pfeffer
patent: 3671861 (1972-06-01), Fleetman et al.
patent: 3777264 (1973-12-01), Erbert

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