Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1995-05-05
1997-08-05
Strecker, Gerard R.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
318464, 324165, 32420721, 364565, G01P 3487, G01P 3489, G01P 1300
Patent
active
056546335
ABSTRACT:
A tachometer for monitoring the rotation of an output shaft (e.g. of a motor, where the motor is enclosed within a standard NEMA housing), includes an enclosure (e.g. adapted to be secured to an end plate of the motor housing), the enclosure having a radial center and a longitudinal axis which, when the enclosure is secured to the housing, are aligned with a longitudinal axis of the output shaft. The enclosure has at least one mounting surface in a peripheral wall portion thereof, the mounting surface having an aperture formed therein which opens in a radial direction. A sensor module including a pair of axially aligned magneto-resistive sensors is mountable on the mounting surface of the enclosure such that the module protrudes through the aperture with the sensors facing radially inwardly. An annular drum having a pair of magnetic patterns arranged on a peripheral end surface thereof is operatively fixed on the motor output shaft via a hub member such that the magnetic patterns on the drum are automatically aligned with the sensors and radially spaced therefrom by a predetermined radial gap when the drum is fixed to the output shaft and the enclosure is mounted on the end plate in an operatively assembled relationship.
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Bioty Joseph F.
Griffen Neil C.
Stokes Richard S.
Lake Shore Cryotronics, Inc.
Strecker Gerard R.
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