Method and apparatus for measuring rotary movement of a shaft
US5502377A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 7, 1994 |
| Grant date | Mar 26, 1996 |
| Priority date | — |
| Expiry date | Dec 7, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P3/487
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to a method and apparatus for measuring the rotary movement of a shaft, wherein according to said method a magnetic pattern radially applied to a magnetic disk is inductively scanned so that in a magnetic head voltage pulses are generated which are associated with the magnetic pattern and used for determining the rotary movement and the angular position of a rotating object. To realize a measuring arrangement featuring a selectable measuring resolution, by means of a read/write head at least one magnetic pattern is radially applied with a randomly selectable recording density to the magnetic disk connected to the shaft to be measured, said pattern being then inductively scanned at a constant rotational speed of the read/write head as the magnetic disk is at rest. From the induced voltage pulses the read/write head speed is computed by electronic means and stored. Another inductive scanning during rotation of the magnetic disk at the read/write head speed previously used permits the rotational speed of the shaft and the angle of rotation to be determined by electonic means from the superposition of both voltage pulses induced in the read/write head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.