Self-aligning tachometer with interchangeable elements for different resolution outputs
US5293125A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 17, 1992 |
| Grant date | Mar 8, 1994 |
| Priority date | — |
| Expiry date | Jan 17, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K7/20
- WIPO fieldMeasurement
- WIPO sectorInstruments
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 i…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.