Electric motor

US7554249B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Hans-Peter Braun · Sulz am Neckar, DE
• Ning Qu · Beijing, CN
• Klaus Heyers · Reutlingen, DE
• Heinz Eisenschmid · Stuttgart, DE
• Carsten Raudzis · Neuffen, DE
• Frank Schatz · Kornwestheim, DE

Key dates

• Filing date: Apr 14, 2004
• Grant date: Jun 30, 2009
• Expiry date: Jan 29, 2026

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02N2300/106
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An electric motor, in particular a starter device for internal combustion engines in which a current-limiting electric resistor (57) with a negative temperature coefficient is connected at the beginning of the main current path (49) of an electromagnetically excitable rotor (53) of the electric motor (16). The electric resistor (57) contains at least one monocrystalline semiconductor.