Magnetic damping system for induction watthour meters
First Claim
1. In an induction watthour meter including a rotatably mounted electroconductive disk armature driven by alternating flux fields produced by an alternating current electromagnet, a magnetic damping system for said disk armature comprising a counterposed pair of predeterminedly spaced damping magnet units with each unit positioned adjacent opposite sides of the disk armature and opposite the other, said magnet units each comprising an assemblage including a non-permanent magnet bridge member for conducting magnetic flux, a cobalt-rare earth permanent magnet affixed to the bridge member, and a non-permanent magnet projection member for conducting magnetic flux on said bridge member extending in spaced symmetrical relationship with and in the same direction as said magnet and being of approximately the same dimensions as the magnet, the unlike poles of said permanent magnets and said non-permanent magnet projection members for conducting magnetic flux each being aligned with its respective counterpart on the opposite side of the interposing disk armature whereby a closed loop magnetic flux field is established through the counterposed pair of damping magnet units and passes twice and in opposite directions through the interposed disk armature.
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Abstract
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 pair of unit assemblages each of which is positioned on an opposite side of the driven disk.
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Citations
10 Claims
- 1. In an induction watthour meter including a rotatably mounted electroconductive disk armature driven by alternating flux fields produced by an alternating current electromagnet, a magnetic damping system for said disk armature comprising a counterposed pair of predeterminedly spaced damping magnet units with each unit positioned adjacent opposite sides of the disk armature and opposite the other, said magnet units each comprising an assemblage including a non-permanent magnet bridge member for conducting magnetic flux, a cobalt-rare earth permanent magnet affixed to the bridge member, and a non-permanent magnet projection member for conducting magnetic flux on said bridge member extending in spaced symmetrical relationship with and in the same direction as said magnet and being of approximately the same dimensions as the magnet, the unlike poles of said permanent magnets and said non-permanent magnet projection members for conducting magnetic flux each being aligned with its respective counterpart on the opposite side of the interposing disk armature whereby a closed loop magnetic flux field is established through the counterposed pair of damping magnet units and passes twice and in opposite directions through the interposed disk armature.
- 3. In an induction watthour meter including a rotatably mounted electroconductive disk armature driven by alternating flux fields produced by an alternating current electromagnet, a magnetic damping system for said disk armature comprising a counterposed pair of predeterminedly spaced damping magnet units with each unit positioned adjacent opposite sides of the disk armature and opposite the other, said magnet units each comprising an assemblage including a non-permanent magnet bridge member for conducting magnetic flux, a cobalt-rare earth permanent magnet affixed to the bridge member adjacent one of its ends, said magnet being provided with a temperature compensating shunt of a metal having a negative temperature coefficient of permeability adjoined thereto, and a non-permanent magnet projection member for conducting magnetic flux on said bridge member adjacent its end opposite the end having the permanent magnet affixed thereto and extending in spaced symmetrical relationship with and in the same direction as the magnet, the unlike poles of said permanent magnets and said non-permanent magnet projection members for conducting magnetic flux each being aligned with its respective counterpart on the opposite side of the interposing disk armature whereby a closed loop magnetic flux field is established through the counterposed pair of damping magnetic units and passes twice and in opposite directions through the interposed disk armature.
- 5. In an alternating current induction watthour meter including a frame, a rotatably mounted electroconductive disk armature driven by alternating flux fields produced by an alternating current electromagnet, a magnetic damping system for said disk armature comprising a counterposed pair of predeterminedly spaced damping magnet units mounted on the frame with each unit positioned adjacent opposite sides of the rotatable disk armature and opposite the other, said magnet units each comprising an assemblage including a non-permanent magnet bridge member for conducting magnetic flux, a cobalt-rare earth permanent magnet affixed to the bridge member adjacent one of its ends, and being provided with a temperature compensating shunt comprising a relatively thin body of magnetic material having a negative temperature coefficient of permeability adjoining at least two opposing sides of the permanent magnet, a non-permanent magnet projection member for conducting magnetic flux on said bridge member adjacent its end opposite the end having the permanent magnet affixed thereto and extending in spaced symmetrical relationship with and in the same direction as said magnet and being of approximately the same dimensions as the magnet and its temperature compensating shunts, the unlike like poles of said permanent magnets and said non-permanent magnet projection members for conducting magnetic flux each being aligned with its respective counterparts on the opposite side of the interposing disk armature whereby a closed loop magnetic flux field is established through the counterposed pair of damping magnet units and passes in opposite directions through the interposed disk armature.
- 9. In an induction watthour meter including a rotatably mounted electroconductive disk armature driven by alternating flux fields produced by an alternating current electromagnet, a magnetic damping system for said disk armature comprising a counterposed pair of predeterminedly spaced damping magnet units with each unit positioned adjacent opposite sides of the disk armature and opposite the other, said magnet units each comprising an assemblage including a non-permanent magnet bridge member for conducting magnetic flux, a cobalt-rare earth permanent magnet affixed to the bridge member, and a non-permanent magnet projection member for conducting magnetic flux on said bridge member extending in spaced symmetrical relationship with and in the same direction as said magnet and being of approximately the same dimensions as the magnet, the unlike poles of said permanent magnets and said non-permanent magnet projection members for conducting magnetic flux each being aligned with its respective counterpart on the opposite side of the interposing disk armature whereby a closed loop magnetic flux field is established through the counterposed pair of damping magnet units and passes in opposite directions through the interposed disk armature, and an adjustable magnetic shunt located adjacent one of said unit assemblage in close proximity to the magnetic bridge member thereof, said magnetic bridge member of the unit assemblage located adjacent to the adjustable magnetic shunt being of substantially reduced dimensions in relation to the magnetic bridge member of the other counterposed unit of the pair.
Specification