Remote indicator for displaying transmitted data by angular displacement
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United States of America Patent
Stats
-
Apr 17, 1984
Grant Date -
N/A
app pub date -
Nov 21, 1979
filing date -
Nov 21, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A remote indicator displays data contained in a transmitted signal by angular displacement of a rotor. In essence, the indicator comprises a rotatably mounted magnetic rotor, a plurality of controllable magnetic field generators disposed circumferentially around the rotor, and appropriate selection circuitry. A sector selection circuit responsive to the transmitted data selectively enables at proper polarity a plurality of generators appropriate for controlling the rotor within the sector representative of the data, and an angle selection circuit responsive to the transmitted data alternately drives selected generators by electrical pulses time modulated to drive the rotor within the sector to the angular position representative of the transmitted data. Distortions due to residual magnetism are substantially eliminated by the use of AC pulsing, and non-linear salient pole effects are eliminated through the use of look-up table techniques.
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