Apparatus for measuring electromagnetic values of a coil, in particular for measuring the position of armature of a coil/armature magnetic system

US4950985A · kind A · utility

Assignee

• Herion-Werke KG

Inventors

• Thomas Voss · Stuttgart, DE
• Peter Winterhalter · Schlichten, DE
• Gunter Feier · Schorndorf, DE

Key dates

• Filing date: Dec 6, 1988
• Grant date: Aug 21, 1990
• Expiry date: Dec 6, 2008

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01F2007/185
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An apparatus for measuring the electromagnetic values of a coil, in particular for measuring the position of the armature of a coil/armature magnetic system includes a capacitor connected parallel at an arbitrary location to a supply line for the coil so as to define a parallel resonant circuit containing inductance of the coil and capacitance of the capacitor. An exciting frequency is introduced into the parallel resonant circuit by a transducer which is connected to the supply line. In addition, an evaluation instrument is connected to the supply line for determining the resonant frequency of the parallel resonant circuit and thus the position of the armature of the coil/armature magnetic system.