Method for commutating an electronically commutated DC motor, and motor for carrying out said method

US6940243B2 · kind B2 · utility

Assignee

• ebm-papst St. Georgen GmbH & Co. KG · DE

Inventors

• Hansjörg Berroth · Villingen-Schwenningen, DE
• Alexander Hahn · Roetgen, DE
• Frank Heller · Berlin, DE
• Frank Jeske · Tennenbronn, DE
• Arno Karwath · Rottweil, DE
• Arnold Kuner · St. Georgen, DE
• Hans-Dieter Schondelmaier · St. Georgen, DE
• Hermann Rappenecker · Vöhrenbach, DE
• Günther Strasser · Rottenbuch, DE

Key dates

• Filing date: Dec 21, 2001
• Grant date: Sep 6, 2005
• Expiry date: Dec 21, 2021

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02P2209/07
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

An improved method of commutating an electronically commutated DC motor shuts off application of power between the end of one current pulse and the beginning of the subsequent current pulse. Based upon the instantaneous rotation speed, one calculates at what instant to shut off the power. During the power interruption, the disconnected winding is operated in short-circuit mode using two MOSFET transistors, and the decay of the current is monitored. When the current reaches a predetermined reduced value, the terminals of the winding are switched to a high-resistance state, until the subsequent current pulse is started. This has the advantage that less reactive power occurs during operation, and one need not install as bulky a storage capacitor as the capacitors used heretofore.