Electronically commutated motor

US6452349B1 · kind B1 · utility

Assignee

• Papst Motoren GmbH & Co KG · DE

Inventors

• Alexander Hahn · Roetgen, DE
• Hermann Rappenecker · Vöhrenbach, DE

Key dates

• Filing date: May 3, 2001
• Grant date: Sep 17, 2002
• Expiry date: May 3, 2021

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02P6/28
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

In an electronically commutated motor, both the driving current (i2) and the braking current (i2′) are monitored. When excessive driving current occurs, a pulse duty factor which regulates the current is reduced. When excessive braking current occurs, this pulse duty factor is increased. For this purpose, an analog circuit with two current limiting members is disclosed, as well as a circuit in which these functions are implemented by software in a microcontroller, so that current measurement can be dispensed with. Finally, a combination of these features is disclosed, in which hardware current limitation and software current limitation work together.