Patent · US Expired

Device for detecting rotational speed of a motor using first and second sensors and a switching unit to select between the two sensors

US4847555A · kind A · utility

21Cited by

6References

6Claims

0Family size

Assignee

Heidelberger Druckmaschinen AG · DE

Inventors

Walter Stammer · Dielheim, DE
Bertold Grutzmacher · Schriesheim, DE
Peter T. Blaser · Dielheim, DE

Key dates

Filing date	Dec 7, 1987
Grant date	Jul 11, 1989
Priority date	—
Expiry date	Dec 7, 2007

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S388/933
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A device for detecting the rotational speed of a motor by a first rotational speed sensor and at least a second rotational speed sensor and a switch unit connected to the rotational speed sensors, the switch unit selecting signals from one of the sensors within a respective given rotational speed range.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.