Electronically commutated electric motor having emergency running properties

US8742706B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Torsten Henke · Waiblingen, DE
• Oliver Wackerl · Bad Boll, DE
• Ulrich Vollmer · Weilheim, DE
• Dirk Lamprecht · Waiblingen, DE

Key dates

• Filing date: Feb 18, 2010
• Grant date: Jun 3, 2014
• Expiry date: Dec 6, 2030

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02P29/032
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

The invention relates to an electronically commutated electric motor. The electric motor comprises a stator, and a rotor, in particular a permanent-magnetic rotor. The electric motor further comprises a control unit connected to the stator. The control unit is designed to actuate the stator such that the stator can generate a magnetic rotating field for rotationally moving the rotor. According to the invention, the control unit of the electric motor is provided with a power output stage having semiconductor switches. Subject to the low-resistance, or short-circuited, semiconductor switch of the power output stage, in particular as a result of defect, the control unit is designed to actuate the stator for generating the rotating field such that during a complete rotor revolution, the rotor can provide a mechanical output, or in the operational mode, a braking torque of the electric motor caused by the defect is reduced, or completely neutralized, by the low-resistance, or short-circuited, semiconductor switch.