Electric motor having a pulse width modulator

US9018890B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Volker Lurk · Offenburg, DE
• Nikolas Haberl · Baden-Baden, DE
• Frank Fischer · Mesa, US
• Christian Poddey · Besigheim, DE
• Michael Koerner · Laufenburg (Baden), DE
• Tobias Stiefel · Baden-Baden, DE

Key dates

• Filing date: Dec 1, 2010
• Grant date: Apr 28, 2015
• Expiry date: Jul 29, 2031

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02P7/29
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

The invention relates to an electric motor having a stator and a rotor. The electric motor also comprises a controller, wherein the controller is connected to the stator and/or rotor, and is designed for applying current to the stator and/or rotor for rotating the rotor. According to the invention, the controller comprises a pulse width modulator designed for controlling a power output of the electric motor, in order to generate a predetermined number of different current application patterns. The current application patterns each represent a power output of the electric motor, and preferably comprise a time sequence of current pulses, each having a current pulse duration. The controller is designed for applying current to the electric motor according to at least two different current application patterns for actuating the electric motor during a time interval of actuation, such that a power output of the electric motor in the time-based average of the time interval of actuation, in particular from the beginning to the end of the time interval, is different from the power outputs represented by the current application patterns in the time interval of actuation.