Tachogenerator for detecting the rotational speed of a rotating machine part
US6417662B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 8, 2000 |
| Grant date | Jul 9, 2002 |
| Priority date | — |
| Expiry date | Feb 8, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P3/489
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a tachogenerator for detecting the rotation speed of a rotating machine part, in particular that of a vehicle wheel, having a predetermined measurement resolution, having at least one magnetically acting encoder which can rotate with the machine part, has magnetically acting areas which are subdivided in a predetermined sequence into angle parts, in particular teeth composed of ferromagnetic material or a magnetic pole ring, and which, during rotation, produces a measurement signal in at least one magnet sensor which is arranged to be stationary relative to the encoder and is separated from said encoder by an air gap, which measurement signal corresponds to the angular pitch of the encoder and whose frequency corresponds to the rotation frequency of the machine part, in order to produce measurement signals which can be evaluated with an air gap which is not constant, the angular pitch of the encoder is coarser than the predetermined measurement resolution requires, and at least two magnet sensors are provided, which are arranged fixed one behind the other in the rotation direction, relative to the encoder, in order to produce at least two mutually phase-shifted measurement signa…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.