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

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 n1, 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 () relative to each other of (60/n+i.Math.360/n), wherein i is a whole number. The disclosure further relates to a rolling bearing arrangement.

Claims

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 n1; and wherein the ring segments are provided in pairs and the mean radii of the respective ring segments of the pairs have an angle () of (60/n+i.Math.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.Math.), wherein the central angles (2.Math.) 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 () is formed between every two adjacent ring segments, wherein the distances between angles () 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.Math.) 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.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further details, advantages, and refinements of the disclosure result from the following description of preferred embodiments of the disclosure, with reference to the drawings. In the drawings:

(2) FIG. 1 shows a cross-sectional representation of an embodiment of a sensor arrangement according to the disclosure;

(3) FIG. 2 shows a perspective cross-sectional representation of a rolling bearing arrangement of the type in question, according to the prior art;

(4) FIG. 3 shows a cross-sectional representation of the rolling bearing arrangement shown in FIG. 2;

(5) FIG. 4 shows a detailed representation of a circuit board shown in FIG. 2;

(6) FIG. 5 shows a cross-sectional representation of a further embodiment of the sensor arrangement according to the disclosure;

(7) FIG. 6 shows a material measure of the type known from the prior art for the rolling bearing arrangement shown in FIG. 2;

(8) FIG. 7 shows the material measure shown in FIG. 2, in detail;

(9) FIG. 8 shows a material measure for a bipolar angle sensor according to the prior art; and

(10) FIG. 9 shows a further material measure for a bipolar angle sensor according to the prior art.

DETAILED DESCRIPTION

(11) FIG. 1 shows a cross-sectional representation of an embodiment of a sensor arrangement according to the disclosure. A material measure 14 and a pot core 17, in particular, are shown in this cross-sectional representation. For the rest, this embodiment is identical to the sensor arrangement according to the disclosure in terms of its design of the angle sensor 02 shown in FIGS. 2 to 4, although it differs in terms of the design of the ring segments 38 (see FIG. 4) and the resultant arrangement of the receiver coils 28 (shown in FIG. 4). The sensor arrangement according to the disclosure also preferably forms a rolling bearing arrangement jointly with the rolling bearing 01 shown in FIG. 2.

(12) The embodiment shown of the sensor arrangement according to the disclosure includes a unipolar angle sensor. The number of poles is therefore n=1. The rotatable material measure 14 has an eccentricity (not shown) and is designed, in particular, similarly to the material measures 14 shown in FIG. 6 and FIG. 7. The unipolar angle sensor is used for carrying out the absolute measurement of angles in the range of 0 to 360.

(13) In the embodiment shown, both the radial inner U-limb 18 and the radial outer U-limb 19 of the pot core 17 are segmented into the ring segments 38, wherein, according to the disclosure, only the U-limb of the two U-limbs 18, 19 whose ring segments 38 are surrounded by the receiver coils 28 must be segmented (shown in FIG. 4). In principle, either the ring segments 38 of the inner U-limb 18 or the ring segments 38 of the outer U-limb 19 are surrounded by the receiver coils 28 (shown in FIG. 4). Preferably, the inner U-limb 18 and the outer U-limb 19 of the pot core 17 are segmented into the ring segments 38 in the same way.

(14) Each of the two U-limbs 18, 19 includes eight of the ring segments 38 which, together, form two ring segment arrangements 41, 42, each comprising four of the ring segments 38. Each of the two ring segment arrangements 41, 42 is already itself the arrangement of the ring segments 38 necessary for a unipolar angle sensor according to the prior art (shown in FIG. 2 to FIG. 4). According to the disclosure, two of the ring segment arrangements 41, 42 are formed, which are offset with respect to each other by a rotational angle of =60/n=60/1=60 relative to the rotational axis 04. For this reason, the ring segments 38 are provided on each of the two U-limbs 18, 19 in pairs. Four pairs 43, 44, 46, 47 of the ring segments 38 are provided. In each of the pairs 43, 44, 46, 47, the two ring segments 38 of the particular pair 43, 44, 46, 47 has an offset angle of =60/n=60/1=60 with respect to each other relative to the rotational axis 04. A mean radius 51 can be assigned to each of the circular segment-shaped ring segments 38. The mean radii 51 of the two ring segments 38 of each of the pairs 43, 44, 46, 47 also has the angle =60/n=60/1=60 with respect to each other.

(15) All the ring segments 38 may have an identical central angle 2.Math.. The two ring segments 38 of each of the individual pairs 43, 44, 46, 47 therefore extend symmetrically at an angle about the mean radii 51 which are situated at angular positions of 0 and 60.

(16) The receiver coils 28 (shown in FIG. 4) are preferably formed by sine coils and cosine coils. The terms sine coil and cosine coil are known from the prior art, for example from WO 2011/134955 A2. In the embodiment shown, the sine coils are formed in pairs (not shown), wherein each of the pairs of sine coils includes a positive sine coil and a negative sine coil. The signals that can be measured using the positive sine coil and the signals that can be measured using the negative sine coil during the rotation of the material measure 14 have an electrical period that represents a rotational angle between the material measure and the sensor ring of 360/n=360/1=360. The cosine coils are formed in pairs in the same way (not shown), wherein each of the pairs of cosine coils includes a positive cosine coil and a negative cosine coil. The signals that can be measured using the positive cosine coil and the signals that can be measured using the negative cosine coil during the rotation of the material measure 14 have an electrical period that represents a rotational angle between the material measure and the sensor ring of 360/n=360/1=360.

(17) A first ring segment 61 of the first ring segment arrangement 41 and a first ring segment 71 of the second ring segment arrangement 42 are surrounded by the positive sine coil (not shown). A second ring segment 62 of the first ring segment arrangement 41 and a second ring segment 72 of the second ring segment arrangement 42 are surrounded by the negative sine coil (not shown). A third ring segment 63 of the first ring segment arrangement 41 and a third ring segment 73 of the second ring segment arrangement 42 are surrounded by the positive cosine coil (not shown). A fourth ring segment 64 of the first ring segment arrangement 41 and a fourth ring segment 74 of the second ring segment arrangement 42 are surrounded by the negative cosine coil (not shown).

(18) FIG. 5 shows yet another embodiment of the sensor arrangement according to the disclosure, in a cross-sectional representation. The pot core 17, in particular, is shown in this cross-sectional representation. For the rest, this embodiment is identical to the sensor arrangement according to the disclosure in terms of its design of the angle sensor 02 shown in FIGS. 2 to 4, although it differs in terms of the design of the ring segments 38 (see FIG. 4) and the resultant arrangement of the receiver coils 28 (shown in FIG. 4).

(19) The embodiment shown of the sensor arrangement according to the disclosure includes a four-pole angle sensor. The number of poles is therefore n=4. The rotatable material measure (not shown; see FIGS. 8 and 9) has an eccentricity having four maxima and four minima of their ring width. The four-pole angle sensor is used for carrying out the absolute measurement of angles in the range of 0 to 360/4=90.

(20) In the embodiment shown, both the inner U-limb 18 and the outer U-limb 19 of the pot core 17 are segmented into the ring segments 38, wherein, according to the disclosure, only the U-limb of the two U-limbs 18, 19 that is surrounded by the receiver coils 28 must be segmented (shown in FIG. 4). In principle, either the ring segments 38 of the inner U-limb 18 or the ring segments 38 of the outer U-limb 19 are surrounded by the receiver coils 28 (shown in FIG. 4). Preferably, the inner U-limb 18 and the outer U-limb 19 of the pot core 17 are segmented into the ring segments 38 in the same way.

(21) Each of the two U-limbs 18, 19 includes 26 of the ring segments 38 which, together, form two ring segment arrangements 41, 42, each comprising 13 of the ring segments 38. Each of the two ring segment arrangements 41, 42 is already itself the arrangement of the ring segments 38 necessary for a four-pole angle sensor according to the prior art. According to the disclosure, two of the ring segment arrangements 41, 42 are formed, which are offset with respect to each other relative to the rotational axis 04 by a rotational angle of =60/n=60/4=15 or =60/n+3.Math.360/n=60/4+270=285, respectively. For this reason, the ring segments 38 are provided on each of the two U-limbs 18, 19 in pairs. Four pairs 43, 44, 46, 47 of the ring segments 38 are provided. In three of the four pairs 43, 44, 46, the two ring segments 38 of the particular pair 43, 44, 46 have an offset angle of 60/n=60/4=15 with respect to each other relative to the rotational axis 04. In one of the four pairs 47, the two ring segments 38 of this pair 47 have an offset angle of =60/n+3.Math.360/n=60/4+270=285 with respect to each other relative to the rotational axis 04.

(22) A distance between angles separates every two directly adjacent ring segments 38. All distances between angles on the inner U-limb 18 and on the outer U-limb 19 of the pot core 17 are equal. A few shortened ring segments 53 that have a smaller central angle than the remaining ring segments 38 are formed for this purpose.

(23) The arrangement of the pairs 43, 44, 46, 47 of the ring segments 38 allows for a redundant evaluation of the determination of the angle to be measured. In the case of the multipolar angle sensor, all necessary signals can be generated in one circular ring sector having a central angle 180, and so redundant signals are made available by utilizing a second circular ring sector. The redundant signals can be evaluated separately and they increase the functional reliability. This evaluation can take place outside of or inside the angle sensor.

LIST OF REFERENCE NUMBERS

(24) 01 rolling bearing 02 angle sensor 03 inner ring 04 rotational axis 05 06 outer ring 07 rolling element 08 cage 09 sealing disk 10 11 sensor ring 12 holding element 13 peripheral groove in the outer ring 14 material measure 15 16 peripheral groove in the inner ring 17 U-shaped pot core 18 inner U-limb 19 outer U-limb 20 21 U-base 22 inner support ring 23 outer support ring 24 annular space 25 26 circuit board 27 transmitting coil 28 receiver coils 29 cable 30 31 cable holder 32 recess in the outer support ring 35 36 strip conductors 37 openings in the circuit board 38 ring segments 40 41 first ring segment arrangement 42 second ring segment arrangement 43 pair of ring segments 44 pair of ring segments 45 46 pair of ring segments 47 pair of ring segments 50 51 mean radius 52 53 shortened ring segment 60 61 first ring segment of the first ring segment arrangement 62 second ring segment of the first ring segment arrangement 63 third ring segment of the first ring segment arrangement 64 fourth ring segment of the first ring segment arrangement 70 71 first ring segment of the second ring segment arrangement 72 second ring segment of the second ring segment arrangement 73 third ring segment of the second ring segment arrangement 74 fourth ring segment of the second ring segment arrangement 2 central angle offset angle distance between angles