Magnetic position sensor for measuring linear displacement
AssigneeKoninklijke Philips Electronics N.V.
InventorsMatthias Wendt, Reinhold Elferich
Life of this patent
Estimating the term…
Abstract
The invention relates to a device with a magnetic position sensor comprising a field sensor (5) and analysis electronics (7) for linear displacements of a rod-shaped component (3), in particular the shaft of an actuator, with an element (M) generating a magnetic field (4) and a position sensor measuring the magnetic field strength angle of this field, the field angle signal determined by this sensor being used for displacement path determination. The element generating a magnetic field (4) is an axially magnetized magnet casing (M) which surrounds the rod-shaped component (3) of the actuator itself, is fixedly connected thereto and can rotate therewith about its displacement axis (z).
Claims14
A device for measuring linear displacement of a rod-shaped component, comprising:
- a magnetic position sensor;
- analysis electronics;
- an element which generates a magnetic field, wherein the magnetic position sensor measures a magnetic field strength angle of the magnetic field, and a magnetic field strength angle signal determined by the magnetic position sensor is used by the analysis electronics for determining a displacement path, wherein the element which generates a magnetic field is an axially magnetized magnet casing which surrounds the rod-shaped component, is fixedly connected thereto, and rotates therewith about a displacement axis;
- and
- a ring-shaped recess of the rod-shaped component in which the element which generates a magnetic field is disposed, the element being surrounded by a non-ferromagnetic shaft casing of a greater length than that of the element.
Dependencies are inferred from the claim text.