Tachometer device controlled by an electric motor
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United States of America Patent
Stats
-
Dec 30, 1980
Grant Date -
N/A
app pub date -
Apr 16, 1979
filing date -
Apr 21, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A device (1) for transmitting rotary motion from a first to a second shaft and for measuring the angular speed of said rotary motion, comprising a first and second pulse generator associated respectively with said first and second shaft, and governing, by means of a processing circuit, the operation of an electric motor (2) of direct current type one shaft (7) of which is torsionally coupled to said second shaft; and a speed indicator comprising means (25) sensitive to magnetic field variations is described. The main feature of this device (1) is that said second pulse generator comprises a magneto-electrical transducer (32), and a permanent magnet (9) is torsionally coupled to said second shaft; said magnet (9) determining the activation either of said magneto-electrical transducer (32), or of those means (25) of said speed indicator which are sensitive to magnetic field variations.
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