Weighing machine with flat magnets for electromagnetic torque compensation

US4382480A · kind A · utility

Assignee

• Sartorius AG · DE

Inventors

• Erich Knothe · Bovenden, DE
• Christoph Berg · Oettingen, DE
• Franz-Josef Melcher · Hardegsen, DE

Key dates

• Filing date: Jul 13, 1981
• Grant date: May 10, 1983
• Expiry date: Jul 13, 2001

Classification

• Technology area (CPC G): Physics
• CPC primary: G01G21/244
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A weighing machine employing electromagnetic forces having a weighing pan which is mounted at the top portion thereof. An electromagnetic coil is employed in an air gap of a stationary permanent magnet system for generating a compensating force. The coil has a rectangular shape while the permanent magnet system consists of rectangular plates of magnetically active material with the vertical direction of magnetism being above or below the longer sides of the coil. A horizontal compensating force results.