Magnetic revolution counter and method for determining numbers of revolutions that can be determined by means of said revolution counter

US10962386B2 · kind B2 · utility

Assignees

• Horst Siedle GmbH & Co. KG · DE
• LEIBNIZ-INSTITUT FUR PHOTONISCHE TECHNOLOGIEN E.V. · DE

Inventors

• Roland Mattheis · Jena, DE
• Marco Diegel · Jena, DE

Key dates

• Filing date: Dec 7, 2016
• Grant date: Mar 30, 2021
• Expiry date: Nov 17, 2037

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/093
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A magnetic revolution counter, and method for determining a predefinable number n of revolutions to be determined of a rotating magnetic field, generated by a magnetic system includes a revolution sensor, which includes magnetic domain wall conductors composed of open spirals or closed, multiply-wound loops, which are formed by a GMR layer stack or a soft magnetic layer comprising locally present TMR layer stacks and in which magnetic 180° domain walls can be introduced and located by measuring the electrical resistance of predefinable spiral or loop sections, wherein a single domain wall is, or at least two magnetic domain walls are, introduced into the domain wall conductors such that the at least two domain walls are brought into a defined separation of greater than 360° with respect to one another, based on the change in location thereof from a first to a second position, with a rotation of the outer magnetic field by the angle of greater than 360°, and are permanently thus spaced apart from one another, and electrical contacts, which are disposed in a defined manner on the domain wall conductors, are provided.