Drive apparatus for a cross coil type meter

Details Drive apparatus for a cross coil type meter Drive apparatus for a cross coil type meter

1989-01-19

1990-05-08

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

324143, 324167, G01R 100

Patent

active

049241788

ABSTRACT:
A drive apparatus for a cross-coil type meter has cross-coils formed of a first and a second coil disposed intersecting at the center thereof. A magnet rotor is disposed in a magnetic field set up by the cross coils, and a measurement is represented in terms of a rotational angle of the magnet rotor. The drive apparatus comprises a first supply means for supplying the first coil with a first square wave current having a duty cycle of a% in accordance with the measurement; a second supply means for supplying the second coil with a second square wave current having a duty cycle of (100-a)% complementary to the first square wave current; and a polarity setting means for setting in accordance with the measurement polarities of the first square wave current and the second square wave current.

REFERENCES:
patent: 3544897 (1970-12-01), Simurda
patent: 3636447 (1972-01-01), Gelenius
patent: 3946311 (1976-03-01), Baker et al.
patent: 4051434 (1977-09-01), Sweet
patent: 4228396 (1980-10-01), Palombo et al.
patent: 4230894 (1980-10-01), Taylor
patent: 4371834 (1983-02-01), Bezard et al.
patent: 4443795 (1984-04-01), Fowler
patent: 4742297 (1988-05-01), Heaton et al.
patent: 4827209 (1989-05-01), Tanaka et al.
patent: 4841238 (1989-06-01), Birch

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