Method for limiting axial accelerations without contouring errors

US5825654A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Wolfgang Speth · Bornsteiner Straße, DE
• Wilhelm Westermeyer · Wendelstein, DE

Key dates

• Filing date: Jun 27, 1997
• Grant date: Oct 20, 1998
• Expiry date: Jun 27, 2017

Classification

• Technology area (CPC G): Physics
• CPC primary: G05B19/4103
• WIPO field: Control
• WIPO sector: Instruments

Abstract

In a method for a velocity control of electric drives, which permits limiting of the axial accelerations without contouring errors, the required dynamic path limits being determined sufficiently accurately in advance in the vicinity of singular regions by determining the course of the machine axes before the interpolation in an approximate fashion by an approximation via polynomials of higher order and deriving a possibly required local path velocity limit or local path acceleration limit for each control data record with the aid of the global machine axis upper acceleration limits and machine axis upper velocity limits. Otherwise, the feed rate remains constant. The scanning increment for the approximation is variable and is adapted depending on the calculated machine axis loading by scanning the critical regions more finely.