Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent
1988-03-25
1990-01-23
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
318696, 324117R, 34097002, G01R 1116
Patent
active
048961051
ABSTRACT:
An AC electric energy meter is coupled to a source of AC electrical energy and to an AC load. A sensing circuit senses the amount of AC electric energy consumed by the AC electric load. An AC electric energy measuring circuit generates a pulse signal representative of the amount of AC electric energy consumed by the AC electric load. A switching circuit receives the pulse signal from the AC electrical energy measuring circuit and controls current flow from the AC electrical energy source to a stepper motor to drive an output shaft of the stepper motor in a unidirectional manner based on the pulse signal. A register is coupled to the output shaft of the stepper motor for registering the amount of electrical energy consumed by the AC electric load based on the amount of rotation of the output shaft of the stepper motor. The stepper motor includes a core having an air gap, a rotatable permanent magnet positioned in the air gap and a winding wound about the core, for generating a magnetic field across the air gap. The switching circuit controls the direction of current flow through the winding to alternately reverse the polarity of the magnetic field across the air gap, so that the permanent magnet rotates in a unidirectional manner.
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Elms Robert T.
Engel Joseph C.
Burns W.
Eisenzopf Reinhard J.
Studebaker B. R.
Westinghouse Electric Corp.
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