Position measuring system and method for operating a position measuring system

US6097318A · kind A · utility

Assignee

• DR. JOHANNES HEIDENHAIN GMBH · DE

Inventors

• Rainer Hagl · Cham, DE
• Mathias Hausschmid · Palling, DE
• Erwin Spanner · Traunstein, DE
• Jurgen Thiel · Surberg, DE
• Johann Streitwieser · Annaberg-Buchholz, DE

Key dates

• Filing date: Apr 16, 1998
• Grant date: Aug 1, 2000
• Expiry date: Apr 16, 2018

Classification

• Technology area (CPC G): Physics
• CPC primary: G01D5/2449
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A position measuring system for the determination of the relative positions of two objects which can be moved with respect to each other, as well as a process for operating the same are disclosed, which in case of a relative movement provides at least one pair of phase-shifted analog incremental signals, and which makes possible a definite variation of the signal periods (SP) by at least one signal period variation factor (n) of the analog incremental signals transmitted to an evaluation unit arranged behind it by a signal period variation unit. The signal period variation unit furthermore comprises correction means for eliminating most varied errors in the output signals (SIN', COS'). Among these are counted errors possibly resulting during the signal period variation, as well as measurement arrangement-specific errors.