CN114424015A - Encoder for a displacement sensor, method for producing an encoder, and displacement sensor having an encoder - Google Patents

Encoder for a displacement sensor, method for producing an encoder, and displacement sensor having an encoder Download PDF

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Publication number
CN114424015A
CN114424015A CN202080069020.8A CN202080069020A CN114424015A CN 114424015 A CN114424015 A CN 114424015A CN 202080069020 A CN202080069020 A CN 202080069020A CN 114424015 A CN114424015 A CN 114424015A
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CN
China
Prior art keywords
encoder
sensor core
sensor
rod
displacement sensor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202080069020.8A
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Chinese (zh)
Inventor
M·斯蒂茨
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Robert Bosch GmbH
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Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of CN114424015A publication Critical patent/CN114424015A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y80/00—Products made by additive manufacturing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
    • G01D5/2006—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils
    • G01D5/2013—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils by a movable ferromagnetic element, e.g. a core
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D2205/00—Indexing scheme relating to details of means for transferring or converting the output of a sensing member
    • G01D2205/70—Position sensors comprising a moving target with particular shapes, e.g. of soft magnetic targets
    • G01D2205/77—Specific profiles

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

An encoder and a displacement sensor having such an encoder and a method for manufacturing such an encoder are disclosed. The encoder has an encoder shaft which is connected on the one hand to the component to be monitored, for example a slide valve, and on the other hand is fixed to the sensor core. The sensor core moves in the coil of the displacement sensor and thus generates an electrical output signal. The production of the sensor core and in this case also the fastening of the sensor core 2 to the encoder rod 1 takes place by means of an additive or production method, for example by means of a 3D printer 10.

Description

Encoder for a displacement sensor, method for producing an encoder, and displacement sensor having an encoder
Technical Field
The present invention relates to an encoder for a displacement sensor according to the preamble of claim 1, a displacement sensor with such an encoder and a manufacturing method for such an encoder.
Background
Displacement sensors for detecting a linear movement and thus a position of a component are known from the prior art. The displacement sensor has an encoder with a magnetic sensor core, the movement of which is detected in a stationary coil. The magnetic sensor core is coupled via a non-magnetic encoder rod to the component whose movement is to be detected. The encoder shaft and sensor core are referred to herein as an encoder.
Such displacement sensors are used, for example, to detect the movement of a control slide of a valve. The control slide is then fixedly connected to the sensor core via the encoder rod, while the coil of the displacement sensor is fixedly connected to the housing of the valve.
According to the prior art, the sensor core can be welded to the encoder rod. It is also known to form the sensor core as a metal plate which is bent in a tubular manner around the encoder shaft. Both of these fixing methods are costly.
Disclosure of Invention
In contrast, the object on which the invention is based is to provide an encoder, a displacement sensor and a production method which have reduced complexity for fastening the sensor core to the encoder shaft.
This object is achieved by an encoder having the features of claim 1 and by a displacement sensor having the features of claim 9. With regard to the method, the object is achieved by a method having the features of claim 11.
Further advantageous embodiments of the invention are described in the dependent claims.
The claimed encoder design is used in a displacement sensor. The encoder has a non-magnetic encoder shaft which can be fastened to the component to be monitored. The encoder also has a magnetic, preferably rotationally symmetrical, sensor core which is fixed to the encoder shaft. The sensor core can be inserted into the coil of the displacement sensor and can be moved therein. This produces an output signal or a change in the output signal from the coil. According to the invention, the sensor core is produced by means of an additive method, for example by means of a 3D printer, and in this way is also fixed on the encoder rod.
In the prior art, the cross-section of the sensor core is usually of identical design in the direction of the longitudinal axis. Preferably, the cross-section of the sensor core can vary in the direction of the longitudinal axis and can be easily manufactured by the additive method according to the invention.
The sensor core may have a central main section and two end sections. The main section may for example have more than 80% of the length of the sensor core in the direction of movement.
The main section can be arranged between two truncated cone-shaped sections in order to optimize the output signal of the movement along the sensor core.
The geometry which influences or optimizes the output signal of the displacement sensors of the prior art can be produced in the sensor core produced according to the invention. Thus, for example, a geometry can be selected which smoothes or flattens the non-linear output signal and changes it into a linear output signal. For this purpose, the sensor core or its main section can have a cross section which is matched in the axial direction. In particular, the housing may be concavely or convexly curved.
In the case of a double-acting displacement sensor, for example a slide valve which can be moved in two opposite directions from a central position, a sensor core produced according to the invention offers further advantages. Thus, for example, a geometry can be selected that changes an asymmetric output signal to a symmetric output signal. For this purpose, the sensor core or its main section is designed asymmetrically with respect to a center plane perpendicular to the direction of movement.
The sensor core or its main section can also have a cylindrical shape (known per se from the prior art).
The displacement sensor according to the invention has a coil and the above-mentioned encoder.
As described above according to the specific example, the sensor core can be shaped according to a curve of the output signal in order to influence the output signal accordingly, wherein the output signal can be generated on the coil according to a movement of the sensor core.
The method according to the invention is used for manufacturing the above-described encoder and has the following steps:
-fixing the encoder rod in a 3D printer, an
-additively constructing the sensor core on an end section of the encoder rod.
Preferably, the encoder rod is inserted into the recess of the base plate of the 3D printer as much as possible, for example at least 80%. The end section concerned can then be arranged adjacent to the base plate of the 3D printer slightly above the base plate. Thus, the additive construction of the sensor core can then be carried out with increasing working height.
The additive construction of the sensor core preferably starts at a rounded end face, which is formed at the end section of the encoder rod.
Drawings
Embodiments of an encoder for a displacement sensor according to the invention and an embodiment of a manufacturing method according to the invention are shown in the drawings.
Figure 1 shows a main cut-out of an encoder according to the invention according to a first embodiment,
figure 2 shows a main cut-out of an encoder according to the invention according to a second embodiment,
figure 3 shows a main cut-out of an encoder according to the invention according to a third embodiment,
fig. 4 shows a main cut-out of an encoder according to the invention according to a fourth embodiment, an
Fig. 5 shows a cut-out of a 3D printer with a first embodiment of an encoder according to the invention.
Detailed Description
Fig. 1 to 4 each show an exemplary embodiment of an encoder which is composed of an encoder shaft 1 and a sensor core 2, which are only partially shown. The encoders can be displaced along their respective longitudinal axes 3 and are rotationally symmetrical for this purpose.
In all four exemplary embodiments shown, the respective sensor core 2 is fastened to the disk-shaped end face 4 of the respectively shown end section 6 of the encoder shaft 1. The sensor core 2 shown in each case is fixed in the 3D printer and is also constructed or produced.
Fig. 5 shows a first embodiment of an encoder according to the invention according to fig. 1 at the end of its manufacture. Here, a cut-out of the substrate 8 of the 3D printer 10 is shown. A recess 12 formed as a deep-drilled hole is formed in the base plate 8, which recess has a venting (not shown) for powder residues, in which recess at least 80% of the encoder rod is accommodated at the beginning of the construction of the sensor core 2. Thus, only the end section 6 of the encoder rod 1 protrudes from the base plate 8.
By means of an additive method or 3D printer 10, the magnetic material of the sensor core 2 is then (from bottom to top in fig. 5) built up in layers starting from the end face 4, said sensor core having in fig. 1 a simple cylindrical shape.
In contrast, fig. 2 to 4 show a more complex form of the sensor core 2. More precisely, the exemplary embodiment or fig. 2 and 3 each show a cylindrical main section 14, which in each case has two truncated-cone-shaped sections 16 adjacent to the main section.
Fig. 4 shows a fourth exemplary embodiment of an encoder according to the present invention, wherein again only the end section of the encoder rod 8 and the sensor core 2 are shown. The sensor core 2 has a main section 14 with a concavely curved outer shell, wherein the curvature is asymmetrical with respect to a center plane 20 arranged perpendicularly to the longitudinal axis 3. The asymmetrical body 14 according to the fourth exemplary embodiment of fig. 4 is therefore suitable for the bidirectional detection of a movement of a slide valve (not shown) when an asymmetrical output signal occurs according to the prior art in a symmetrically shaped sensor core 2. Thus, the asymmetrical shaping of the sensor core 2 makes the asymmetrical output signal symmetrical. In other words, the asymmetrical shaping produces an output signal which is in principle identical for a movement of the component to be monitored in a first direction and for a movement of the component to be monitored in the opposite direction.
The sensor cores 2 according to the second to fourth exemplary embodiments of fig. 2 to 4 each also have a disk-shaped or cylindrical end section 18 at their end sections. However, these may also be omitted.
An encoder and a displacement sensor having such an encoder and a method for manufacturing such an encoder are disclosed. The encoder has an encoder shaft 1 which is fastened on the one hand to the component to be monitored, for example a slide valve, and on the other hand to a sensor core 2. The sensor core 2 is moved by the component in the coil of the displacement sensor and thus generates an electrical output signal. The production of the sensor core 2 and in this case also the fastening of the sensor core 2 to the encoder rod 1 takes place by means of an additive or production method, for example by means of a 3D printer 10.
List of reference numerals
1 encoder rod
2 sensor core
3 longitudinal axis
4 end face
6 end section
8 base plate
103D printer
12 recess
14 main section
16 section of truncated cone shape
18 end section
20 center plane

Claims (13)

1. An encoder for a displacement sensor, having a non-magnetic encoder rod (1) which can be fixed on a component to be monitored, and a magnetic sensor core (2) which is fixed on the encoder rod (1) and can be inserted into a coil of the displacement sensor and can be moved therein, characterized in that the sensor core (2) is produced and fixed on the encoder rod (1) by means of an additive method or by means of a 3D printer (10).
2. Encoder according to claim 1, wherein the sensor core (2) is asymmetric.
3. Encoder according to any of the preceding claims, wherein the sensor core (2) has a main section (14).
4. Encoder according to claim 3, wherein the main section (14) is arranged between a truncated cone shaped section (16) and/or a cylindrical end section (18).
5. Encoder according to claim 3 or 4, wherein the sensor core (2) or the main section (14) has a continuously curved housing.
6. The encoder of claim 5, wherein the housing is concavely curved.
7. The encoder of claim 5, wherein the housing is convexly curved.
8. Encoder according to claim 3 or 4, wherein the sensor core (2) or the main section (14) is cylindrical.
9. A displacement sensor having a coil and having an encoder according to any preceding claim.
10. Displacement sensor according to claim 9, wherein the sensor core (2) is shaped according to an output signal, which can be generated on the coil according to a movement of the sensor core (2).
11. A method for manufacturing an encoder according to any of claims 1 to 8, the method having the steps of:
-fixing the encoder rod (1) in a 3D printer,
-additively constructing the sensor core (2) on an end section (6) of the encoder rod (1).
12. The method according to claim 11, wherein the encoder rod (1) is accommodated as far as possible in a recess (12) of a base plate (8) of the 3D printer (10).
13. The method according to claim 11 or 12, wherein the additive construction starts at an end face (4) formed at an end section (6) of the encoder rod (1).
CN202080069020.8A 2019-10-01 2020-09-25 Encoder for a displacement sensor, method for producing an encoder, and displacement sensor having an encoder Pending CN114424015A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102019215134.5A DE102019215134A1 (en) 2019-10-01 2019-10-01 Encoder for displacement transducers and manufacturing processes for one encoder and displacement transducer with one encoder
DE102019215134.5 2019-10-01
PCT/EP2020/076862 WO2021063817A1 (en) 2019-10-01 2020-09-25 Encoder for a distance sensor and method for manufacturing an encoder and distance sensor comprising an encoder

Publications (1)

Publication Number Publication Date
CN114424015A true CN114424015A (en) 2022-04-29

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DE (1) DE102019215134A1 (en)
WO (1) WO2021063817A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3127470A1 (en) * 1981-07-11 1983-01-20 Robert Bosch Gmbh, 7000 Stuttgart INDUCTIVE SENSOR FOR A FLUIDIC ACTUATOR
CN106030327A (en) * 2014-02-25 2016-10-12 罗伯特·博世有限公司 Sensor apparatus, production method for a sensor apparatus having at least one magnetic core and method for determining a field strength of a magnetic field in at least one spatial direction
EP3431932A1 (en) * 2017-07-13 2019-01-23 Rosemount Aerospace Inc. Annular magnets for rotor position estimation
EP3503135A1 (en) * 2017-12-22 2019-06-26 Hamilton Sundstrand Corporation Electromagnetic device
US20190223756A1 (en) * 2016-09-01 2019-07-25 St. Jude Medical International Holding S.Á.R.L. Core designs for miniature inductive coil sensors

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3127470A1 (en) * 1981-07-11 1983-01-20 Robert Bosch Gmbh, 7000 Stuttgart INDUCTIVE SENSOR FOR A FLUIDIC ACTUATOR
CN106030327A (en) * 2014-02-25 2016-10-12 罗伯特·博世有限公司 Sensor apparatus, production method for a sensor apparatus having at least one magnetic core and method for determining a field strength of a magnetic field in at least one spatial direction
US20190223756A1 (en) * 2016-09-01 2019-07-25 St. Jude Medical International Holding S.Á.R.L. Core designs for miniature inductive coil sensors
EP3431932A1 (en) * 2017-07-13 2019-01-23 Rosemount Aerospace Inc. Annular magnets for rotor position estimation
EP3503135A1 (en) * 2017-12-22 2019-06-26 Hamilton Sundstrand Corporation Electromagnetic device

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DE102019215134A1 (en) 2021-04-01
WO2021063817A1 (en) 2021-04-08

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