초록 ▼

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 measu

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).

대표청구항 ▼

1. 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

1. 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. 2. A device as claimed in claim 1, characterized in that the rod-shaped component consists of a non-ferromagnetic or only a weakly ferromagnetic material. 3. A device as claimed in claim 1, characterized in that the magnetic position sensor comprises magnetoresistive elements. 4. A device as claimed in claim 1, characterized in that the magnetic position sensor comprises Hall effect sensors. 5. A device as claimed in claim 1, characterized in that the magnetic position sensor comprises field coils. 6. A device as claimed in claim 1, characterized in that the magnet casing consisting of a magnetic material consists of ring discs joined together. 7. A device as claimed in claim 6, characterized in that the ring discs consist of materials having a different remanence. 8. A device as claimed in claim 1, characterized in that the magnet casing is axially differently magnetized when consisting of a homogeneous magnetic material. 9. A device as claimed in claim 1, characterized in that the magnet casing either consisting of a homogeneous material or assembled from ring discs has a ratio of diameter to length ranging from 2/3 to 3/2, preferably in a proximity of 1, so as to form a minimum field strength. 10. A device as claimed in claim 1, characterized in that a field the magnetic position sensor is arranged on an inner side of a casing-shaped screen. 11. A device as claimed in claim 1, characterized in that the analysis electronics and the magnetic position are situated within a screen. 12. A device as claimed in claim 1, characterized in that the shaft casing is also disposed in the rod-shaped component. 13. A device as claimed in claim 1, characterized in that the analysis electronics are arranged on an outer side of a screen and carry the magnetic position sensor within a linear guide casing by means of a carrier guided through the screen. 14. A device as claimed in claim 1, characterized in that the rod-shaped component in the an area of measurement of the device consists of two parts connected together by means of a central pin arrangement and in that the magnet casing and the shaft casing are pushed onto the rod-shaped component in an area of the central pin arrangement.