DE102017116508A1 - Arrangement for measuring a force or a moment and magnetic field sensor for this purpose - Google Patents

Abstract

The present invention initially relates to a magnetic field sensor (06) for measuring a magnetic field, which is characterized by a magnetization in a machine element (01) and by a force acting on the machine element (01) and / or by a moment acting on the machine element (01). M) due to the inverse magnetostrictive effect is effected. The magnetic field sensor (06) comprises at least one magnetic field guide element (11), which comprises at least a first leg (12) and a second leg (13). According to the invention, the magnetic field sensor (06) comprises at least one first magnetic field sensor element (08, 28) arranged on the first leg (12) of the magnetic field guide element (11) and a second magnetic field sensor element (09, 29, 29) arranged on the second leg (13) of the magnetic field guide element (11) ). The invention further relates to an arrangement for measuring a force and / or moment (M) on a machine element (01) extending in an axis (04). The measurement of the force and / or the moment (M) takes place using the inverse-magnetostrictive effect.

Description

The present invention initially relates to a magnetic field sensor for measuring a magnetic field which is caused by a magnetization in a machine element and by a force acting on the machine element and / or by a torque acting on the machine element due to the inverse-magnetostrictive effect. The invention further relates to an arrangement for measuring a force and / or moment on a machine element extending in an axis. The measurement of the force and / or the moment takes place using the inverse-magnetostrictive effect.

The EP 2 365 927 B1 shows a bottom bracket with two cranks and a chainring carrier, which is connected to a shaft of the bottom bracket. The chainring carrier is rotatably connected to a chainring shaft, which in turn is rotatably connected to the shaft. The sprocket shaft has a section on a magnetization. A sensor is provided which detects a change in the magnetization at a torque present in the region of the magnetization.

The US Pat. No. 6,490,934 B2 teaches a magnetoelastic torque sensor for measuring torque acting on an element having a ferromagnetic, magnetostrictive and magnetoelastically active region. This area is formed in a transducer, which sits as a cylindrical sleeve, for example on a shaft. The torque sensor faces the transducer.

From the EP 0 803 053 B1 and from the US 5,465,627 For example, a torque sensor is known which comprises a magnetoelastic transducer having a circumferential magnetization. To generate the circulating magnetization, a shaft can be set in rotation so that a tangential magnetic field is generated in the shaft by a permanent magnet or by a coil. The transducer in the form of a ring can also be polarized in that an electrical conductor is threaded through the shaft or through the ring and energized, the ring may be partially immersed in an electrically conductive liquid. A sensor can be arranged with a yoke opposite to the magnetoelastic transducer.

The US 8,087,304 B2 teaches a magnetoelastic torque sensor in which the influence of an external magnetic field is to be suppressed. For this purpose, the torque sensor comprises three individual magnetic field sensors, which face differently aligned circumferential magnetizations.

From the DE 10 2015 200 268 B3 an arrangement for measuring a force and / or a moment using the inverse magnetostrictive effect is known, which has at least two axially spaced magnetic field sensors, between which a magnetic field is formed.

The US 9,429,488 B2 shows an arrangement with a magnetostrictive sensor comprising a transmitting and a receiving coil, between which a magnetic shield is arranged.

The object of the present invention, starting from the prior art, is to increase the accuracy of a measurement based on the inverse-magnetostrictive effect of a force acting on a machine element and / or a moment acting on a machine element.

Said object is achieved by a magnetic field sensor according to the appended claim 1 and by an arrangement according to the attached independent claim 9.

The magnetic field sensor according to the invention is used to measure a magnetic field which is caused by a magnetization in a machine element and by a force acting on the machine element and / or by a moment acting on the machine element due to the inverse-magnetostrictive effect. Thus, the magnetic field sensor indirectly serves to measure the force acting on the machine element and / or the torque acting on the machine element using the inverse-magnetostrictive effect. The machine element extends in one axis. The force or the moment acts on the machine element, which leads to mechanical stresses and the machine element usually deforms slightly. The axis preferably forms an axis of rotation of the machine element. By the axis are defined a radial direction, a tangential or circumferential direction and an axial direction, which are aligned perpendicular to each other.

The machine element has at least one magnetization area extending circumferentially about the axis for a magnetization formed in the machine element. It is thus a magnetization region revolving around the axis, wherein the axis itself preferably does not form part of the magnetization region. The magnetization region has a tangential orientation with respect to a surface of the machine element extending around the axis. The magnetization region preferably has only a tangential orientation with respect to a surface of the machine element extending around the axis. The magnetization region preferably extends along a closed path around the axis, wherein the magnetization region may have short gaps. The magnetization region can be formed, for example, within a sleeve, which forms part of the machine element and sits firmly on a shaft forming a further part of the machine element. The magnetization region forms a primary sensor for determining the force or moment. The magnetization region can also be regarded as a magnetization track because of its circumferential configuration.

The magnetic field sensor forms a secondary sensor for determining the force or the moment. The primary sensor, d. H. the magnetization area serves to convert the force to be measured or the moment to be measured into a corresponding magnetic field, while the secondary sensor enables the conversion of this magnetic field into electrical signals. The magnetic field sensor faces the magnetization region, so that it is preferably located at a same axial position as the magnetization region. Thus, the magnetic field sensor is radially offset from the magnetization region.

The magnetic field sensor comprises at least one magnetic field conducting element, which has at least one first magnetic field conducting leg and a second magnetic field conducting leg.

According to the invention, the magnetic field sensor comprises at least one first magnetic field sensor element arranged on the first leg and a second magnetic field sensor element arranged on the second leg of the magnetic field conducting element. The two magnetic field sensor elements serve to receive the magnetic field, which is caused by the magnetization and by the force and / or by the moment due to the inverse-magnetostrictive effect. The legs are to be directed to the magnetization region of the machine element. Only one air gap remains between the legs and the magnetization area. By virtue of the magnetic field guide element formed according to the invention, the two magnetic field sensor elements are coupled to the magnetization region of the machine element with only a small magnetic resistance so that the magnetic field produced due to the inverse magnetostrictive effect reaches the two magnetic field sensor elements with little loss. The magnetic circuit does not run through the air except for the remaining narrow air gaps. The thus measurable with the two magnetic field sensor elements magnetic field is significantly greater than the earth's magnetic field in many cases, whereby the disturbing influence of the earth's magnetic field or other interference fields is minimized and the signal-to-noise ratio of the measurement is increased. Since, in particular, the radially oriented magnetic field is measured, it is sufficient for most applications to have exactly one magnetization region or exactly one magnetization track of the machine element, so that a further magnetization region or a further magnetization trace is not necessary for compensating interference fields. Accordingly, the machine element preferably has only the exact one magnetization region or only the exactly one magnetization trace.

In preferred embodiments, an air gap is formed in each case between the limbs of the magnetic field guide element directed toward the magnetization region and the magnetization region. The air gap is formed in each case between an end face of the respective leg and the magnetization region.

In preferred embodiments, the magnetic field sensor elements are spaced in the axial direction. The magnetic field sensor elements preferably have a same position in the radial direction, so that they have an equal distance from the axis. The magnetic field sensor elements preferably have a same position in the tangential direction, so that they have a same circumferential position.

The magnetic field sensor elements are preferably each formed by a receiver coil or by a semiconductor sensor element. The receiver coils and the semiconductor sensor elements convert the received magnetic field into an electrical signal.

The magnetic field sensor is preferably formed by a Förster probe or by a fluxgate magnetometer. The Förster probe or the fluxgate magnetometer comprises the magnetic field sensor elements formed by the receiver coils.

In preferred embodiments, the first leg of the magnetic field guide element forms a coil core for the first magnetic field sensor element formed by the first receiver coil, while the second leg of the magnetic field guide element forms a coil core for the second magnetic field sensor element formed by the second receiver coil.

In particularly preferred embodiments, the receiver coils are formed on a flexible board. Thereby, the magnetic field sensor can be made in a flat shape so that it can be arranged in a small gap. In addition, the magnetic field sensor can be adapted to different sized machine elements. The flexible board is preferred bent and / or folded. The flexible board is preferably bent like a ring or as a ring arc, so that the magnetic field sensor can be easily inserted into, for example, a bore. The receiver coils are preferably formed by conductor tracks on the flexible board. The receiver coils can be printed into the flexible board or printed on the flexible board. The receiver coils can also be printed as interconnects in several layers. The receiver coils may also be formed in a chip.

In preferred embodiments, the legs of the magnetic field guide are aligned in the radial direction. Alternatively preferred is a deviation from the radial direction of up to 30 ° given. The legs of the magnetic field guiding element are preferably aligned perpendicular to a surface of the machine element. Alternatively, a deviation from the perpendicular to the surface of the machine element of up to 30 ° is given.

In preferred embodiments, the magnetic field guiding element comprises a magnetic field conducting web which connects the two legs. The web serves to form a magnetic circuit in the section between the two legs. The bridge ensures a small magnetic resistance between the two legs. The web connects the two legs preferably on the side facing away from the machine element of the legs.

The web preferably extends in the axial direction so that it is aligned parallel to the axis.

The web and the two legs are preferably formed together in one piece, for example by a wire.

The legs preferably have a circular cross-section. Accordingly, the receiver coils preferably have circular turns.

In preferred embodiments, the magnetic field guiding element is formed by a U-shaped bent wire. The web and the legs are preferably each straight. The receiver coils preferably have circular turns which wind around the legs of wire. The turns preferably extend vertically around the legs.

In alternatively preferred embodiments, the web has the shape of a cylinder jacket portion, while the legs each have the shape of a circular ring segment. Thus, the web has a circular arc-shaped cross-section. The cylinder shell section shape is preferably coaxial with the machine element. The magnetic field guiding element in these embodiments preferably consists of a sheet of a soft magnetic material. The receiver coils in these embodiments preferably have rectangular windings which wind around the legs of sheet metal.

In alternatively preferred embodiments, the web is formed in a magnetic field sensor carrier. The magnetic field sensor carrier carries the magnetic field sensor, wherein the magnetic field sensor is preferably arranged between the magnetic field sensor carrier and the machine element. The magnetic field sensor carrier consists of a magnetically conductive material. The legs are preferably straight in these embodiments and open onto the magnetic field sensor carrier. The legs are preferably formed like a pin. The legs are preferably arranged perpendicular to the magnetic field sensor carrier. The legs are preferably attached to the magnetic field sensor carrier.

Since the machine element preferably has the outer shape of a cylinder, the magnetic field sensor preferably has the shape of a cylinder barrel portion when its small thickness in the radial direction is neglected. Accordingly, the magnetic field sensor has a circular arc-shaped cross section. The cylinder shell portion shape is preferably coaxial with the machine element and the magnetization region. Insofar as the small thickness of the magnetic field sensor is not neglected in the radial direction, it preferably has the form of a sleeve section, which can also be understood as a hollow cylinder section. The sleeve portion is preferably arranged coaxially with the machine element and the magnetization region. The cylinder shell portion or the sleeve portion has a center angle with respect to the axis, which is preferably between 20 ° and 90 °.

Since the machine element preferably has the outer shape of a cylinder, the magnetic field sensor preferably has the shape of a cylinder jacket when its small thickness in the radial direction is neglected. Accordingly, the magnetic field sensor has a circular cross-section. The cylinder jacket mold is preferably arranged coaxially with the machine element and with the magnetization region. Insofar as the small thickness of the magnetic field sensor is not neglected in the radial direction, it preferably has the form of a sleeve, which can also be understood as a hollow cylinder. The sleeve shape is preferably arranged coaxially to the machine element and to the magnetization region.

In particularly preferred embodiments, the magnetic field sensor comprises a plurality of pairs of the respective two magnetic field sensor elements and a plurality of the magnetic field guide elements. Each of the pairs of magnetic field sensor elements sits on the legs of one of the magnetic field guide elements.

The plurality of pairs of each of the two magnetic field sensor elements are preferably distributed over a peripheral portion around the magnetization region. Thus, the plural pairs of each of the two magnetic field sensor elements are distributed in the tangential direction. The plurality of pairs of each of the two magnetic field sensor elements preferably have a same axial position and a same radial position.

In a preferred embodiment, the magnetic field sensor elements of the pairs of the respective two magnetic field sensor elements are formed together on the flexible board. In this case, the flexible board is preferably shaped like a cylinder jacket section or like a cylinder jacket. The magnetic field sensor elements are preferably formed by the receiver coils, which are formed as conductor tracks on the flexible board.

Alternatively, preferably, the magnetic field sensor elements are arranged individually on a rigid board, wherein the rigid circuit boards are embedded in a flexible carrier material. The rigid boards each have the dimensions of the respective one of the magnetic field sensor elements, wherein the respective magnetic field sensor element is preferably designed as a receiver coil on the respective rigid board. The rigid boards are preferably each square. The rigid circuit boards with the individual magnetic field sensor elements are preferably completely enclosed in the carrier material, so that the magnetic field sensor elements are protected against moisture, oil and the like. Ä. Are protected. The flexible carrier material is preferably shaped like a cylinder jacket section or like a cylinder jacket, so that the magnetic field sensor can be easily introduced into, for example, a bore. The arrangement of the comparatively small rigid circuit boards in the flexible carrier material allows a flat and small design of the magnetic field sensor.

Alternatively, preferably, the pairs of the two magnetic field sensor elements are each arranged individually on a rigid board, the rigid boards being embedded in a flexible carrier material. The rigid boards each have the dimensions of the respective pair of magnetic field sensor elements, wherein the two magnetic field sensor elements of the respective pair are preferably formed as two receiver coils on the respective rigid board. The rigid boards are preferably each rectangular. The rigid circuit boards with the individual pairs of the magnetic field sensor elements are preferably completely enclosed in the carrier material, so that the magnetic field sensor elements from moisture and oil u. Ä. Are protected. The flexible carrier material is preferably shaped like a cylinder jacket section or like a cylinder jacket, so that the magnetic field sensor can be easily introduced into, for example, a bore. The arrangement of the comparatively small rigid circuit boards in the flexible carrier material allows a flat and small design of the magnetic field sensor.

Alternatively preferably, the pairs of the two magnetic field sensor elements are each arranged individually on a rigid board, wherein the rigid boards are attached to one or two rings. The rigid boards each have the dimensions of the respective pair of magnetic field sensor elements, wherein the two magnetic field sensor elements of the respective pair are preferably formed as two receiver coils on the respective rigid board. The rigid boards are preferably each rectangular. The ring or rings are preferably each formed by a rigid board. Preferably, the pairs of the respective two magnetic field sensor elements supporting rigid circuit boards are arranged axially centrally between the two rings. The rings give the magnetic field sensor a ring shape that can be easily inserted into, for example, a bore.

The magnetic field sensor elements are preferably identical. The at least one arrangement of the respective two magnetic field sensor elements and the magnetic field guiding element is preferably symmetrical.

The magnetic field guiding element or the magnetic field guiding elements are preferably made of a soft magnetic material and are preferably ferromagnetic. The magnetic field guiding element or the magnetic field guiding elements are preferably unmagnetised.

The arrangement according to the invention serves to measure a force and / or a moment on the machine element. The arrangement comprises the machine element already described above, which has the above-described magnetization region. The arrangement further comprises the magnetic field sensor according to the invention, wherein the legs of the at least one magnetic field guiding element of the magnetic field sensor are directed towards the magnetizing area. The arrangement preferably comprises one of the described preferred embodiments of the magnetic field sensor according to the invention. Moreover, the arrangement preferably also has features that are related are specified with the magnetic field sensor according to the invention.

The magnetization region can be permanently or temporarily magnetized. In preferred embodiments of the arrangement according to the invention, the magnetization region is permanently magnetized, so that the magnetization is formed by a permanent magnetization. In alternatively preferred embodiments of the arrangement according to the invention, this further comprises at least one magnet for magnetizing the magnetization region, so that the magnetization of the magnetization region is basically temporary. The at least one magnet may be formed by at least one permanent magnet or preferably by an electromagnet.

The permanently or temporarily magnetized magnetization region is preferably magnetically neutral in a state of the machine element that is unloaded from a force or momentarily outside the magnetization region, so that no technically relevant magnetic field outside the magnetization region can then be measured.

The permanently or temporarily magnetized magnetization region is preferably formed in a magnetoelastic section of the machine element. In the magnetoelastic section of the machine element, the machine element preferably consists of a magnetostrictive material which is magnetically hard or magnetically semi-hard. The at least one magnetization region preferably has a high magnetostriction. Preferably, not only a portion, but the machine element is designed as such magnetoelastic. In this case, the machine element consists of a magnetostrictive material, in particular of a magnetostrictive steel. The magnetization region is preferably formed within a sleeve, which forms part of the machine element and sits firmly on a preferably cylindrical part of the machine element. The legs of the at least one magnetic field guiding element are preferably opposite the axial side surfaces of the sleeve, wherein they overlap the sleeve in the radial direction. The legs of the at least one magnetic field guiding element are alternatively preferably opposite the axial ends of the magnetizing area.

The at least one magnetization region represents a part of the volume of the machine element. The magnetization region is preferably annular, wherein the axis of the machine element also forms a central axis of the ring shape. Particularly preferably, the magnetization region has the shape of a hollow cylinder coaxial with the axis of the machine element.

The machine element preferably has the shape of a prism or a cylinder, wherein the prism or the cylinder is arranged coaxially to the axis. The prism or the cylinder is preferably straight. Particularly preferably, the machine element in the form of a right circular cylinder, which is arranged coaxially to the axis. In particular embodiments, the prism or the cylinder is conical. The machine element may also be hollow.

The machine element is preferably formed by a shaft, by a gear part, by a shift fork, by a sleeve or by a flange. The shaft, the gear part, the shift fork, the sleeve or the flange may be designed for loads due to different forces and moments and be for example a component of a sensor bottom bracket, a roll stabilizer or a fertilizer spreader. In principle, the machine element can also be formed by completely different types of hollow machine elements.

• 1 eine erste bevorzugte Ausführungsform einer erfindungsgemäßen Anordnung in zwei Ansichten;
• 2 eine zweite bevorzugte Ausführungsform der erfindungsgemäßen Anordnung in zwei Ansichten;
• 3 eine erste bevorzugte Ausführungsform eines erfindungsgemäßen Magnetfeldsensors;
• 4 eine zweite bevorzugte Ausführungsform des erfindungsgemäßen Magnetfeldsensors;
• 5 eine dritte bevorzugte Ausführungsform des erfindungsgemäßen Magnetfeldsensors;
• 6 eine vierte bevorzugte Ausführungsform des erfindungsgemäßen Magnetfeldsensors;
• 7 eine dritte bevorzugte Ausführungsform der erfindungsgemäßen Anordnung; und
• 8 eine vierte bevorzugte Ausführungsform der erfindungsgemäßen Anordnung.

Further details, advantages and developments of the invention will become apparent from the following description of preferred embodiments of the invention, with reference to the drawing. Show it:

• 1 a first preferred embodiment of an arrangement according to the invention in two views;
• 2 a second preferred embodiment of the inventive arrangement in two views;
• 3 a first preferred embodiment of a magnetic field sensor according to the invention;
• 4 a second preferred embodiment of the magnetic field sensor according to the invention;
• 5 a third preferred embodiment of the magnetic field sensor according to the invention;
• 6 a fourth preferred embodiment of the magnetic field sensor according to the invention;
• 7 a third preferred embodiment of the inventive arrangement; and
• 8th a fourth preferred embodiment of the arrangement according to the invention.

1 shows a first preferred embodiment of an arrangement according to the invention in two views. In the upper part, a perspective view is shown, while in the lower part, a cross-sectional view is shown. The arrangement according to the invention is used to measure a moment M which points to a machine element 01 acts. The machine element 01 includes a wave 02 and a sleeve firmly seated on the shaft 03 , The machine element 01 extends in one axis 04 which also has a central axis of the machine element 01 forms. The sleeve 03 consists of a magnetoelastic material which has the inverse magnetostrictive effect.

The sleeve 03 is permanently magnetized so that it forms a permanent magnetization region which revolves around the axis 04 extends around; ie it is a circular permanent magnetization.

The arrangement further comprises a magnetic field sensor 06 that has a same middle axial position as the sleeve 03 has. The magnetic field sensor 06 is formed by a fluxgate magnetometer and includes a flexible board 07 that ring around the sleeve 03 is shaped. On the flexible board 07 are several pairs each comprising a first receiver coil 08 and a second receiver coil 09 printed. The multiple pairs of each two receiver coils 08 . 09 extend circumferentially around the sleeve 03 ,

The magnetic field sensor 06 includes several magnetic field guiding elements 11 , each between the two receiver coils 08 . 09 of the several pairs are arranged. The magnetic field guide elements 11 are each formed by a U-shaped wire so that they each have a first leg 12 , a second leg 13 and a jetty 14 include. The first receiver coil 08 sits on the first leg 12 , The second receiver coil 09 sits on the second leg 13 , The first leg 12 and the second leg 13 stand the axial ends of the sleeve 03 each opposite at a very small distance.

The magnetic field sensor 06 is on a magnetic field sensor carrier 16 attached, which is also annular around the machine element 01 extends and may be formed for example by a bore in a housing.

2 shows a second preferred embodiment of the inventive arrangement, the first in 1 similar embodiment. Unlike the in 1 In the embodiment shown, the legs overlap 12 . 13 the axial ends of the sleeve 03 in the radial direction. To enable mounting, the magnetic field sensor is 06 divided into two axial sections.

3 shows a first preferred embodiment of the magnetic field sensor according to the invention 06 as they are in the 1 shown arrangement is used. The flexible board 07 is shown here in an undeformed state. In particular, there are the multiple pairs of each two receiver coils 08 . 09 represented, between which in each case one of the U-shaped magnetic field guiding elements 11 is arranged. One of the U-shaped magnetic field guiding elements 11 with both thighs 12 . 13 and the jetty 14 is also shown in isolation.

4 shows a second preferred embodiment of the magnetic field sensor according to the invention 06 , who is the first in 3 similar embodiment. Unlike the in 3 In the embodiment shown, no flexible board is used. Instead, the receiver coils 08 . 09 individually on rigid circuit boards 18 applied. The rigid boards 18 are in a flexible carrier material 21 embedded. To enable mounting, the U-shaped magnetic field guide elements 11 each divided in the middle and a plug connection 23 connected.

5 shows a third preferred embodiment of the magnetic field sensor according to the invention 06 , who is the first in 3 similar embodiment. Unlike the in 3 In the embodiment shown, no flexible board is used. Instead, the pairs are the receiver coils 08 . 09 individually on rigid circuit boards 18 applied. The rigid boards 18 are on two rings 26 attached from rigid board material.

6 shows a fourth preferred embodiment of the magnetic field sensor according to the invention 06 , who is the first in 3 similar embodiment. Unlike the in 3 embodiment shown, the magnetic field guide elements 11 not the shape of a U-shaped wire. Instead, the jetty points 14 the shape of a cylinder jacket section while the legs 12 . 13 each having the shape of a circular ring segment. The receiver coils 08 . 09 are formed correspondingly rectangular with rounded corners. The cylindrical shell section shape of the bridge 14 already has the radius of the magnetic field sensor 06 when installed.

7 shows a third preferred embodiment of the inventive arrangement, the first in 1 similar embodiment. Unlike the in 1 embodiment shown, the magnetic field guide elements 11 not each a U-shape on. Instead, the bridges are 14 the magnetic field guiding elements 11 each in the magnetic field sensor carrier 16 educated. The thigh 12 . 13 are pin-shaped and stand on an inner surface of the magnetic field sensor carrier 16 ,

8th shows a fourth preferred embodiment of the inventive arrangement, the first in 1 similar embodiment. Unlike the in 1 embodiment shown are a first Semiconductor sensor element 28 and a second semiconductor sensor element 29 used instead of the first receiver coil and the second receiver coil. The first leg 12 is within the first semiconductor sensor element 28 educated. The second leg 13 is within the second semiconductor sensor element 29 educated. The magnetic field sensor 06 is thus formed by a semiconductor sensor.

LIST OF REFERENCE NUMBERS

01

machine element

02

wave

03

Sleeve, permanent magnetization region

04

axis

05

-

06

magnetic field sensor

07

flexible board

08

first receiver coil

09

second receiver coil

10

-

11

Magnetfeldleitelement

12

first leg

13

second leg

14

web

15

-

16

Magnetic field sensor support

17

-

18

rigid board

19

-

20

-

21

flexible carrier material

22

-

23

connector

24

-

25

-

26

Ring made of rigid board material

27

-

28

first semiconductor sensor element

29

second semiconductor sensor element

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 2365927 B1 [0002]
• US 6490934 B2 [0003]
• EP 0803053 B1 [0004]
• US 5465627 [0004]
• US8087304 B2 [0005]
• DE 102015200268 B3 [0006]
• US 9429488 B2 [0007]

Claims (10)

Magnetic field sensor (06) for measuring a magnetic field which is generated by a magnetization in a machine element (01) and by a force acting on the machine element (01) and / or by a torque (M) acting on the machine element (01) due to the inverse magnetostrictive effect is effected, wherein the magnetic field sensor (06) comprises at least one magnetic field guiding element (11) comprising at least a first leg (12) and a second leg (13), characterized in that the magnetic field sensor (06) at least a first on the and a second magnetic field sensor element (09, 29) arranged on the second limb (13) of the magnetic field guiding element (11). Magnetic field sensor (06) after Claim 1 , characterized in that the magnetic field sensor elements (08, 09; 28, 29) are each formed by a receiver coil (08; 09) or by a semiconductor sensor element (28; 29). Magnetic field sensor (06) after Claim 2 , characterized in that the receiver coils (08, 09) are formed on a flexible board (07). Magnetic field sensor (06) after one of Claims 1 to 3 , characterized in that the magnetic field guiding element (11) comprises a magnetic field conducting web (14) which connects the two legs (12, 13). Magnetic field sensor (06) after Claim 4 , characterized in that the magnetic field guiding element (11) is formed by a U-shaped bent wire. Magnetic field sensor (06) after Claim 4 , characterized in that the web (14) in a magnetic field sensor carrier (16) is formed, wherein the legs (12, 13) are each formed straight and open onto the magnetic field sensor carrier (16). Magnetic field sensor (06) after one of Claims 1 to 6 , characterized in that it comprises a plurality of pairs of the respective two magnetic field sensor elements (08, 09, 28, 29) and a plurality of magnetic field conducting elements (11). Magnetic field sensor (06) after Claim 7 , characterized in that the magnetic field sensor elements (08, 09, 28, 29) are arranged individually or in pairs on a rigid board (18), wherein the rigid circuit boards (18) are embedded in a flexible carrier material (21). Arrangement for measuring a force and / or a moment (M) on a machine element (01) extending in an axis (04); wherein the machine element (01) has at least one magnetization area (03) extending around the axis (04) for magnetization, the arrangement furthermore comprising at least one magnetic field sensor (06) according to one of the Claims 1 to 8th comprises, and wherein the first leg (12) of the magnetic field guiding element (11) and the second leg (13) of the magnetic field guiding element (11) are directed towards the magnetizing region (03). Arrangement according to Claim 9 , characterized in that the machine element (01) comprises a sleeve (03) in which the magnetization region is formed, wherein the legs (12, 13) of the magnetic field guiding element (11) are arranged at axial positions in which the sleeve (03) each having an axial end, wherein the legs (12, 13) of the magnetic field guiding element (11) overlap the sleeve (03) in the radial direction.

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