Method of controlling the commutation in an electronically commutated motor, and an electronically commutated motor for carrying out said method

US6995534B2 · kind B2 · utility

Assignee

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

Inventors

• Hansjörg Berroth · Villingen-Schwenningen, DE
• Thomas Von Der Heydt · St. Georgen, DE
• Frank Jeske · Tennenbronn, DE
• Arnold Kuner · St. Georgen, DE
• Paul Layes · Donaueschingen, DE
• Hans-Dieter Schondelmaier · St. Georgen, DE
• Günther Strasser · Rottenbuch, DE

Key dates

• Filing date: Jul 20, 2002
• Grant date: Feb 7, 2006
• Expiry date: Oct 2, 2022

Classification

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

Abstract

A method is disclosed for controlling the commutation in an electronically commutated motor (20) which comprises a stator having at least one phase (24, 26), and a permanent-magnet rotor (22), and with which a current limiter (36, 58) and a controller (18) for regulating a motor variable are associated. The current limiter (36, 58) serves to limit the current (I) in the at least one phase (24, 26) to a setpoint value. The regulation by means of the controller (18) is accomplished by modifying the distance in time (W) between switching on (t1) and switching off (t2) of the current (i1, i2) in the at least one phase. In this method, the setpoint value to which the current limiter limits the current (i1, i2) in the relevant phase is modifiable. It is modified substantially as a function of a ratio of two times (W/T), namely as a function of the ratio of the distance in time (W) between switching on (t1) and switching off (t2) of the current (i1, i2) in the relevant phase (24, 26) to the time period (T) required by the rotor, at the instantaneous rotation speed, to rotate through a specified rotation angle. A decrease in noise at low rotation speeds is thereby made possible.