Electromotive adjustment device

US5927249A · kind A · utility

Assignee

• U.S. Philips Corporation · US

Inventors

• Bernd Ackermann · Aachen, DE
• Axel Schumacher · Dauchingen, DE

Key dates

• Filing date: Dec 5, 1997
• Grant date: Jul 27, 1999
• Expiry date: Dec 5, 2017

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D2011/102
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to an electromotive adjustment device with a rotor (9) comprising a magnetized rotary body (8) and with a single-strand, electrically excitable U-shaped stator (11) whose legs (13, 14) form the pole shoes (26, 27) and whose yoke (15) interconnects the two legs (13, 14) and acts as a support for the exciter coil (16), the angular position of the rotor (9) being adjustable by means of the stator current, while the maximum range of the angle of rotation of the rotor is smaller than 180.degree.. Such adjustment devices can be used in particular for the adjustment of a throttle plate in the suction line of an internal combustion engine. To create such an electromotive adjustment device which can be manufactured by a simple technology with small dimensions and low weights, it is provided that the U-shaped stator (11) comprises at least three parts, in that the first part essentially forms the yoke (15) of the stator (11), in that the second and the third part essentially form the legs (13, 14) of the stator (11), and in that the first part (15) is made from an anisotropic material whose preferred direction is substantially aligned with the direction of the magnetic …