Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1996-02-29
1999-03-02
Hofsass, Jeffery A.
Communications: electrical
Condition responsive indicating system
Specific condition
318685, 318696, G08B 2100, H02P 800
Patent
active
058776940
ABSTRACT:
An indicator of a meter is driven by a step motor in which a rotating magnetic field formed by field coils which is a composite of magnetic fields of the coils supplied with a sine-wave-driving current and cosine-wave driving current. The indicator is also returned to a stopper located at a zero position of the meter by the rotating magnetic field. A part of the rotating magnetic field, which is formed from the sine and cosine waves in a range of the phase angle between -340 degree and -(180 degree-.DELTA.a degree) in the zero-return process, is cut after the indicator rests on the stopper so that such part of the rotating magnetic field may not separate the indicator from the stopper.
REFERENCES:
patent: 4501981 (1985-02-01), Hansen
patent: 4553093 (1985-11-01), Chikasue
patent: 5119320 (1992-06-01), Ito et al.
patent: 5214597 (1993-05-01), Ito et al.
patent: 5223791 (1993-06-01), Umerhara
patent: 5287050 (1994-02-01), Kronenberg et al.
patent: 5333371 (1994-08-01), Mittenbuhler et al.
Hofsass Jeffery A.
Nippondenso Co. Ltd.
Trieu Van T.
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