Method for operation of a two-stranded electronically commutated motor, and motor for carrying out said method

US7880427B2 · kind B2 · utility

Assignee

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

Inventors

• Claus Föll · Meßkirch, DE
• Frank Jeske · Tennenbronn, DE
• Arnold Kuner · St. Georgen, DE
• Jens Löffler · St. Georgen, DE

Key dates

• Filing date: Jan 20, 2006
• Grant date: Feb 1, 2011
• Expiry date: Apr 25, 2028

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02P6/22
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A two-stranded electronically commutated DC motor has a permanent-magnet rotor (36), power supply terminals (28, 30) for connecting the motor to a current source (22) and a stator (102) having a winding arrangement which includes first and second winding strands (52, 54). The latter are controlled by respective first and second semiconductor switches (70, 80). The motor also has a third controllable semiconductor switch (50), arranged in a supply lead from one of the terminals (28, 30) to the winding strands (52, 54), which third switch is alternately switched on and off by applying to it a PWM (Pulse Width Modulated) signal 24. During switch-off intervals, magnetic flux energy stored in the motor causes a decaying loop current (i2) to run through the windings, continuing to drive the rotor. This facilitates conformal mapping of temperature information in the PWM signal onto a target motor rotation speed.