Method for adjusting resistance of electromagnet in magnetic bearing and for sensorless determination of position of object mounted in magnetic bearing, taking into account adjusted value of resistance

US8970079B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Georg Bachmaier · Birkenfeld, DE
• Christian Bachmann · Hersbruck, DE
• Dominik Bergmann · Sachsenkam, DE
• Tobias Glück · Wien, AT
• Wolfgang Kemmetmüller · Wien, AT
• Andreas Kugi · Wien, AT

Key dates

• Filing date: Mar 8, 2011
• Grant date: Mar 3, 2015
• Expiry date: Oct 6, 2031

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16C32/0457
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

For an object on a bearing mounting having a magnetic bearing providing a magnetic field generally produced by an electromagnet, the bearing is regulated based on a position of the object relative to the bearing. The position of the object is determined by reference to an estimate of the inductance obtained using a least squares method, in which the electrical resistance of the bearing is taken into account. The resistance is subject to variations, for example due to temperature fluctuations; however, the electrical resistance can be estimated by regulating the inductance error, Δ{circumflex over (L)}={circumflex over (L)}2,sLS−{circumflex over (L)}1,sLS down to zero, where the resistance adjustment facility may be a low-pass filter and an integration controller.