Drive circuit for brushless DC motors

US5583404A · kind A · utility

Inventors

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

Key dates

• Filing date: Oct 5, 1992
• Grant date: Dec 10, 1996
• Expiry date: Oct 5, 2012

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 comprising a rotor and a stator with at least one stator coil includes a commutation device which supplies commutation pulses of drive current to the stator 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 currents according to predetermined functions. The shifting of commutation currents is occasioned by shifting either or both of the ignition part of a commutation pulse and the extinction part of such pulses.