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Class 324/152 - Drag magnet


Subclass of Class 324 - Electricity: measuring and testing
Definition: Subject matter in which the permanent magnet is associated
No. of patents: 10
Last issue date: 06/29/1999


NumberTitleIssue Date
5917317Retarding magnet assembly for electricity meter
A retarding magnet assembly includes magnets configured to apply a constant drag on the rotating disk of an electromechanical electricity meter. The assembly includes upper and lower keepers secured to opposing extensions of the meter frame. A spacer is s...
06/29/1999
4988944Cross coil type instrument
A cross coil type instrument includes a plurality of coils cross-arranged around a movable permanent magnet, a needle fastened to the movable permanent magnet through a shaft projecting from the movable permanent magnet and penetrating the coils, a reset-...
01/29/1991
4933632Apparatus for ferromagnetic measurements of electrical quantities
An apparatus for ferromagnetic measurements of electric quantities comprises a coil having a hollow barrel on which a winding of a conductive wire is formed. A unit which is integral with a needle is positioned in the barrel. The needle is displaced in fr...
06/12/1990
4449094Temperature compensated magnetic damping assembly for induction meters
A temperature compensated magnetic damping assembly for providing a braking torque on an electroconductive disk of an induction device includes a pair of permanent magnets each having an easy axis of magnetization. Each permanent magnet provides two easy ...
05/15/1984
4386316Brake magnet for watt-hour meters
A brake magnet for watt-hour meters using permanent magnet material of low permeability of nearly one and high coercive strength in which exact temperature compensation for a required temperature range can be achieved and which is easily manufactured. The...
05/31/1983
4238730Magnetic brake-damper of electric measuring instrument
A magnetic brake-damper of an electric measuring instrument comprises two similarly magnetized permanent magnets with opposite poles, arranged one above the other and forming a gap accommodating part of the moving element of the instrument. Both permanent...
12/09/1980
4238729Magnetic damping system having low induction magnet
A magnetic damping system for induction devices having electroconductive disk armatures includes a low induction, high coercive force magnet that is vertically elongated and has a horizontal direction of magnetization parallel to the disk. Flux concentrat...
12/09/1980
4182984Magnetic damping assembly with temperature compensator for watthour meters
A watthour meter damping assembly includes a U-shaped magnetic yoke and a pair of highly coercive and anisotropic permanent magnets projecting in facing relationship from the ends of the yoke. Opposing pole faces of the magnets form an air gap receiving a...
01/08/1980
4092184Method of preparing and installing cobalt-rare earth permanent magnets
A method for the manufacture of cobalt-rare earth permanent magnets formed of consolidated particles thereof, for installation within electromagnetic devices such as induction watthour meters, and the product thereof. The method includes the magnetization...
05/30/1978
4030031Magnetic damping system for induction watthour meters
A new and improved magnetic damping system for induction watthour meters including electromagnetically driven disk armatures. The magnetic damping system comprises cobalt-rare earth permanent magnets of relatively small mass deployed in a counterposed pai...
06/14/1977
 
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