Drive circuit for brushless DC motors

US6384554B1 · kind B1 · utility

Assignee

• Papst Licensing GmbH · DE

Inventors

• Arno Karwath · Rottweil, DE
• Mojtaba Moini · Rehna, DE
• Eberhard Wunsch · Bayreuth, DE

Key dates

• Filing date: Feb 10, 1998
• Grant date: May 7, 2002
• Expiry date: Feb 10, 2018

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P80/10
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A drive circuit for brushless DC motors including a rotor and a stator with at least one stator coil includes a commutation device which supplied commutation pulses of drive current to the state coil(s). The commutation device senses the rotor position and calculates current rotor speed therefrom. The rotor speed is then used to shift the commutation circuits according to predetermined functions. The shifting of commutation currents is occasioned by shifting either or both of ignition part of a commutation pulse and the extinction part of such pulse.