Position-measuring device able to monitor deviations from a setpoint behavior and method for operating the position-measuring device

US10197388B2 · kind B2 · utility

Assignee

• DR. JOHANNES HEIDENHAIN GMBH · DE

Inventors

• Elmar Mayer · Nußdorf, DE
• Daniel Frese · Traunstein, DE

Key dates

• Filing date: May 8, 2013
• Grant date: Feb 5, 2019
• Expiry date: May 8, 2033

Classification

• Technology area (CPC G): Physics
• CPC primary: G01D5/3473
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A position-measuring device includes a measuring standard, a scanning unit, and a rotary bearing by which the measuring standard or the scanning unit is rotationally mounted. The measuring standard and the scanning unit are rotatable in relation to each other. The scanning unit generates output signals, on the basis of which a rotary angle associated with the relative motion of the measuring standard and the scanning unit is able to be determined. A monitoring device monitors the rotary bearing for the occurrence of bearing faults and is adapted to detect and analyze at least one measured variable for a plurality of different relative positions of the measuring standard in relation to the scanning unit, in order to determine deviations from a setpoint behavior of the measured variables on the basis of the measured variable detected for a plurality of relative positions.