Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1988-09-27
1989-10-03
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
324208, G01P 348, G01P 354, G01B 714
Patent
active
048722081
ABSTRACT:
A motion detection device such as a tachometer generator (10), is disclosed for the detection of the rotation of a body or shaft around an axis. The generator (10) includes a perforated disc (15) mounted on a shaft (8), and a sensing device (24) including a coil (25) and magnet (21) mounted in close proximity to the perforated disc (15). The disc (15) is made of a ferrous material. When rotated, the alternating holes (16,17) and webs (18) in the disc (15) produce an alternating current in the sensor (24), the frequency of which is proportional to the rotational speed of the disc. Any number of sensors (24) may be used and the disc (15) may have any number of holes (16,17). The signal developed by each or any sensor (24) is transmitted by wires (1,2) to a suitable indicating or recording device.
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Beattie Steven K.
Richards Paul C.
Smith David A.
Eisenzopf Reinhard J.
Ontic Engineering and Manufacturing Inc.
Snow Walter E.
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