On-peak watthour demand meter having compensation for disc loading variations
First Claim
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1. An on-peak watthour demand meter comprising:
- a shaft supported electroconductive metering disc member;
a watthour meter movement for producing voltage and current metering magnetic fluxes effectively to electromagnetically produce driving rotations of said disc member;
watthour gear train means driven by the disc member rotations for indicating the consumption of electric energy;
maximum demand indicating gear train means driven by said disc member rotations for indicating maximum electric power demand;
demand interval gear train means operatively coupled to said maximum demand indicating gear train means;
a timing motor drivingly connected to said demand interval gear train means, said timing motor producing stray magnetic fields effectively to electromagnetically increase the torque produced by the disc member rotations by a predetermined amount substantially equal to the load of said maximum demand indicating gear train means on said disc member;
gear shaft means for coupling and uncoupling said maximum demand indicating gear train means from the driving rotations of said disc member; and
switch means for connecting and disconnecting said timing motor to a source of energization concurrently when said gear shift means couples and uncouples, respectively, said maximum demand indicating gear train means to the disc rotations.
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Abstract
A timing motor of an on-peak demand meter is turned on only during maximum demand metering times. Torque aiding effects of the timing motor stray flux augment the meter disc torque to compensate for the intermittent demand gearing load.
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Citations
6 Claims
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1. An on-peak watthour demand meter comprising:
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a shaft supported electroconductive metering disc member; a watthour meter movement for producing voltage and current metering magnetic fluxes effectively to electromagnetically produce driving rotations of said disc member; watthour gear train means driven by the disc member rotations for indicating the consumption of electric energy; maximum demand indicating gear train means driven by said disc member rotations for indicating maximum electric power demand; demand interval gear train means operatively coupled to said maximum demand indicating gear train means; a timing motor drivingly connected to said demand interval gear train means, said timing motor producing stray magnetic fields effectively to electromagnetically increase the torque produced by the disc member rotations by a predetermined amount substantially equal to the load of said maximum demand indicating gear train means on said disc member; gear shaft means for coupling and uncoupling said maximum demand indicating gear train means from the driving rotations of said disc member; and switch means for connecting and disconnecting said timing motor to a source of energization concurrently when said gear shift means couples and uncouples, respectively, said maximum demand indicating gear train means to the disc rotations. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification