Control method and numerical control for motion control of industrial machine tools

US6456897B1 · kind B1 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Wolfgang Papiernik · Neunkirchen, DE
• Gerhard Pfaff · Mainburg, DE
• Martin Teckentrup · Zirndorf, DE

Key dates

• Filing date: Sep 10, 1999
• Grant date: Sep 24, 2002
• Expiry date: Sep 10, 2019

Classification

• Technology area (CPC G): Physics
• CPC primary: G05B2219/37612
• WIPO field: Control
• WIPO sector: Instruments

Abstract

Control of machine tools and industrial robots is usually implemented in a cascade structure, having not only numerous advantages but also the fundamental disadvantage of lower dynamics in the response to set point in comparison with a single control loop. This disadvantage is compensated today by feed-forward control concepts which permit ideal tracking of the controlled variable without intervention by the controllers, apart from inaccuracies in modeling of the controlled system or disruptions. The enormous computation complexity of these precontrol methods in higher order systems has provided the motivation for the development of a cartesian path control concept which is described in the present invention. While retaining the cascade structure, path accuracy can be improved significantly in comparison with axial feed-forward concepts.