Sensor arrangement comprising an angle sensor and rolling bearing arrangement comprising sensor arrangement

Patent metadata

Field	Value
Publication number	US-10473487-B2
Application number	US-201615573159-A
Country	US
Kind code	B2
Filing date	Apr 12, 2016
Priority date	May 13, 2015
Publication date	Nov 12, 2019
Grant date	Nov 12, 2019

Abstract

A sensor arrangement comprising an angle sensor for measuring torsion is disclosed. The angle sensor is designed for carrying out a measurement via n poles, where n≥1, and primarily comprises a sensor ring which at least partially surrounds a rotational axis, and a material measure which is rotatable relative to this sensor ring. One transmitting coil and multiple receiver coils are situated on the sensor ring. A magnetic circuit is formed between the transmitting coil and the receiver coils, which magnetic circuit comprises the material measure and a pot core including two limbs. In this case, the material measure forms a variable reluctance in the magnetic circuit. At least one of the two limbs of the pot core is segmented in such a way that the limb comprises ring segments. Each of the receiver coils surrounds at least one of the ring segments. Each of the ring segments forms a circular arc having a mean radius. The ring segments may be provided in pairs. The mean radii of the two ring segments of the individual pairs have an angle (β) relative to each other of (60°/n+i·360°/n), wherein i is a whole number. The disclosure further relates to a rolling bearing arrangement.

First claim

The invention claimed is:

1. A sensor arrangement comprising:
an angle sensor, including a sensor ring which at least partially surrounds a rotational axis, and a material measure which is rotatable relative thereto;
wherein at least one transmitting coil and multiple receiver coils are situated on the sensor ring, wherein a signal is transmissible via a magnetic circuit between the transmitting coil and the receiver coils, and wherein the rotatable material measure forms a variable reluctance in the magnetic circuit;
wherein the transmitting coil is situated in an annular pot core forming one part of the magnetic circuit;
wherein the material measure is designed as a rotatable ring which closes the magnetic circuit between two annular limbs of the pot core;
wherein each of the receiver coils is situated partially inside and partially outside the pot core, wherein at least one of the two annular limbs of the pot core is segmented, and so it comprises ring segments, wherein each of the receiver coils surrounds at least one of the ring segments;
wherein each of the ring segments forms a circular arc relative to the rotational axis, wherein a mean radius each circular arc forms an axis of symmetry of the circular arc;
wherein the angle sensor is designed for a measurement via n poles, where n≥1; and
wherein the ring segments are provided in pairs and the mean radii of the respective ring segments of the pairs have an angle (β) of (60°/n+i·360°/n) with respect to each other, and wherein i is a whole number.

2. The sensor arrangement as claimed in claim 1 , wherein the respective ring segments of the pairs are surrounded by one or more of the receiver coils which are designed for additively converting magnetic fluxes flowing through the respective ring segments of a particular pair into an inducted electrical voltage.

3. The sensor arrangement as claimed in claim 2 , wherein the respective ring segments of the pairs are jointly surrounded by one of the receiver coils.

4. The sensor arrangement as claimed in claim 2 , wherein the respective ring segments of each of the pairs are surrounded by one of the receiver coils, and so two of the receiver coils are assigned to each of the pairs, wherein the two receiver coils of the pairs are electrically interconnected in series.

5. The sensor arrangement as claimed in claim 1 , wherein each of the circular arcs of the ring segments has a central angle (2·α), wherein the central angles (2·α) of the circular arcs of the respective ring segments of the pairs are equal.

6. The sensor arrangement as claimed in claim 1 , wherein a distance between angles (γ) is formed between every two adjacent ring segments, wherein the distances between angles (γ) on the segmented annular limb of the pot core are equal.

7. The sensor arrangement as claimed in claim 1 , wherein both of the annular limbs of the pot core are segmented, wherein each of the circular arcs of the ring segments of one of the two annular limbs has an angular position and a central angle (2·α) that are identical to those of the circular arcs of the ring segments of the other of the two annular limbs.

8. The sensor arrangement as claimed in claim 1 , wherein only the ring segments of a radially inner of the two annular limbs of the pot core are surrounded by the receiver coils.

9. The sensor arrangement as claimed in claim 1 , wherein said sensor arrangement further includes an evaluation unit which is electrically connected to the receiver coils in order to receive signals from the receiver coils, wherein the evaluation unit is configured for redundantly processing the signals of the receiver coils that are assigned to the pairs of the ring segments.

10. A rolling bearing arrangement including a rolling bearing comprising a first bearing ring and comprising a second bearing ring which is rotatable relative to the first bearing ring, wherein said rolling bearing arrangement further includes a sensor arrangement as claimed in claim 1 , wherein the sensor ring is coupled to the first bearing ring, and wherein the material measure is connected to the second bearing ring in a rotationally fixed manner.

Assignees

• Schaeffler Technologies Ag

Inventors

• Kegeler Jörg

Classifications

• F16C2233/00

  Monitoring condition, e.g. temperature, load, vibration · CPC title

• G01P3/488

  delivered by variable reluctance detectors · CPC title

• F16C19/522

  related to load on the bearing, e.g. bearings with load sensors or means to protect the bearing against overload · CPC title

• G01P3/42

  Devices characterised by the use of electric or magnetic means (G01P3/66 takes precedence; measuring electric or magnetic values in general G01R) · CPC title

• F16C41/007

  Encoders, e.g. parts with a plurality of alternating magnetic poles · CPC title