Electric machine having a low-mass design in magnetically active parts

US9543064B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Zeljko Jajtic · Birkenfeld, DE
• Gerhard Matscheko · Starnberg, DE

Key dates

• Filing date: Jul 20, 2012
• Grant date: Jan 10, 2017
• Expiry date: Apr 17, 2033

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/4902
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

An electric machine includes a first magnetic pole with an arrangement of interposed magnetically active layers and magnetically inactive layers, and a second magnetic pole movable relative to the first magnetic pole and spaced from the first magnetic pole by a gap. An electrical conductor operates as a coupling element between an electrical circuit and a magnetic circuit. At an operating time, a common useful magnetic flux for electromechanical energy conversion flows through the magnetic circuit composed of the first magnetic pole, the gap and the second magnetic pole. The magnetically inactive layers have a lower average density than the magnetically active layers. A ratio (k) of the total volume of the magnetically active layers to the combined total volume of the magnetically active and inactive layers fulfills the condition 0.5≦k≦0.8 A method for producing an electric machine are also disclosed.