EP2307857A1 - Winkelmesseinrichtung mit schwingungsdämpfender statorkupplung - Google Patents
Winkelmesseinrichtung mit schwingungsdämpfender statorkupplungInfo
- Publication number
- EP2307857A1 EP2307857A1 EP09780501A EP09780501A EP2307857A1 EP 2307857 A1 EP2307857 A1 EP 2307857A1 EP 09780501 A EP09780501 A EP 09780501A EP 09780501 A EP09780501 A EP 09780501A EP 2307857 A1 EP2307857 A1 EP 2307857A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- measuring device
- angle measuring
- stator
- compensating coupling
- rotor
- 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.)
- Ceased
Links
- 230000008878 coupling Effects 0.000 title claims abstract description 46
- 238000010168 coupling process Methods 0.000 title claims abstract description 46
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 46
- 238000013016 damping Methods 0.000 title claims abstract description 16
- 150000001875 compounds Chemical class 0.000 claims description 18
- 238000004382 potting Methods 0.000 claims description 16
- 239000002861 polymer material Substances 0.000 claims description 11
- 239000000945 filler Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 239000007769 metal material Substances 0.000 claims description 3
- 238000003892 spreading Methods 0.000 claims description 3
- 229920001971 elastomer Polymers 0.000 claims description 2
- 239000000806 elastomer Substances 0.000 claims description 2
- 229920006037 cross link polymer Polymers 0.000 claims 1
- 239000002245 particle Substances 0.000 claims 1
- 238000005259 measurement Methods 0.000 description 9
- 239000000499 gel Substances 0.000 description 3
- 229920001296 polysiloxane Polymers 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 239000002313 adhesive film Substances 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013536 elastomeric material Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Classifications
-
- 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
- G01D5/26—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 characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—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 characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—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 characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/347—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 characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells using displacement encoding scales
- G01D5/3473—Circular or rotary encoders
- G01D5/34738—Axles; Driving or coupling means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F1/00—Springs
- F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
- F16F1/38—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers with a sleeve of elastic material between a rigid outer sleeve and a rigid inner sleeve or pin, i.e. bushing-type
Definitions
- the invention relates to an angle measuring device according to claim 1.
- Angular measuring devices often also called rotary encoders, are used to measure rotational movements of a rotatably mounted body, in particular a shaft, over one or more revolutions. The rotational movement is detected incrementally or absolutely. In conjunction with gear racks and gears or with threaded spindles, linear movements can also be measured with an angle measuring device.
- angle measuring devices are used in conjunction with electric motors.
- compensating couplings are used. These can either be arranged between the shaft of the angle measuring device and the electric motor shaft or be designed as so-called stator clutches.
- Stator couplings connect the stator of the angle measuring devices elastically with the stator of the electric motor.
- corresponding compensating couplings are designed to be torsionally rigid in the circumferential direction, so have a high rigidity in torsional loads.
- stator clutches have better properties than rotor clutches.
- an angle measuring device with a compensating coupling which is supported by radial spreading against an inner wall of a motor housing, wherein the stator of the angle measuring device is rotatably connected to the motor housing.
- Such an angle measuring device has the disadvantage that the measurement accuracy can be reduced in certain operating conditions.
- the invention is therefore based on the object to provide an angle measuring device of the type mentioned, which has an improved measurement behavior, in particular an increased measurement accuracy.
- the angle measuring device comprises a stator and a rotor, wherein the rotor is rotatably arranged relative to the stator, in particular by means of a bearing.
- the rotor has a shaft on which a code disk is fastened in a rotationally fixed manner so that it can rotate with the shaft in an angularly accurate manner.
- the stator has a scanning device for scanning the code disk, a body and a compensating coupling.
- the compensating coupling is a radially and axially elastic but torsionally rigid connection of the stator with a machine part to produce. Between the compensating coupling and the body is arranged an element which is in contact with both the compensating coupling and the body and has a vibration-damping property.
- the code disk can be designed so that the angle measuring device outputs incremental and / or absolute angular positions.
- the element is designed as a casting compound or as a molded part.
- the element may be configured as an elastomer.
- the vibration-damping element is made of a polymer material, or the vibration-damping element advantageously comprises a polymer material.
- Polymer material is to be understood below as meaning plastics or silicones. Furthermore, it is advantageous if the polymer material is a crosslinked, for example crosslinked at room temperature, polymer material.
- the element or the casting compound may contain fillers.
- the vibration damping element, in particular the potting compound viscoelastic properties in terms of the theological behavior.
- the element may, for example, as a filled with liquid or gel cushion, which is an outer skin z. B. from a polymeric material.
- the use of the vibration-damping element not only improves the mechanical properties of the compensating coupling with regard to improved measuring behavior of the angle-measuring device, but also makes it possible to optimize the temperature conditions in the angle-measuring device.
- the temperatures in the angle measuring device can be reduced.
- the element or the potting compound has a thermal conductivity of more than 1, 75 W / (n ⁇ K), in particular more than 2.0 W / (m-K) or more than 4.0 W / (n ⁇ K).
- the measurement accuracy can be increased.
- polymer materials which are electrically conductive. The degree of filling can be increased so far that the element or the entire potting compound is thermally and electrically conductive.
- Suitable polymeric materials for the vibration damping element include silicones or epoxy materials. These can be designed, for example, as gels or pastes. Interfaces between the potting compound and the environment of the angle measuring device can with a foil, for. B. be provided with an adhesive film, so that the potting compound is protected against external influences.
- the vibration damping element such as the potting compound, is advantageously designed so that it adheres or adheres to the compensating coupling or to the resilient component of the compensating coupling.
- the compensating coupling can be clamped by radial spreading on the machine part.
- the compensating coupling can have a resilient component and a comparatively rigid component, wherein the rigid component can be pressed or clamped against the machine part.
- the rigid component is a comparatively rigid ring, wherein a relatively good thermal contact between the angle measuring device and the machine part can be achieved by the pressing or clamping.
- a large-area contact between the relevant machine part and the compensating coupling can be produced in this way, which is particularly advantageous for heat dissipation.
- the angle-measuring device is configured such that the vibration-damping element is both in contact with the body and with the resilient member and the rigid member.
- the compensating coupling in particular its resilient component, made of a metal material.
- the element e.g. As the potting compound, may be arranged so that this axially surrounds the resilient member of the compensating coupling, so that both substantially perpendicular to the axis of rotation aligned surfaces of the resilient member are enclosed by the element.
- FIG. 1 shows a sectional view of an angle-measuring device according to a first exemplary embodiment
- FIG. 2 shows a view from below of the angle-measuring device with a resilient component of a compensating coupling according to the first exemplary embodiment
- FIG. 3 shows a perspective view of the resilient component of the compensating coupling
- FIG. 4 shows a view from below of the angle-measuring device with the resilient component of the compensation coupling according to a second exemplary embodiment
- FIG. 5 shows a perspective view of the resilient component of the compensating coupling
- Figure 6 is a sectional view of the angle measuring device according to the second embodiment.
- the angle measuring device shown in FIG. 1 comprises a stator 1 and a rotor 2.
- the rotor 2 has a shaft 2.1 for the non-rotatable connection to a component to be measured, for example on a motor shaft, 5.2.
- the connection between the shaft 2.1 of the angle measuring device and the motor shaft 5.2 is realized for example with a projecting through the shaft 2.1 connecting means in the form of a fastening screw, for which purpose the end of the shaft 2.1 is conical.
- Such angle measuring devices are also often referred to as rotary encoder.
- the shaft 2.1 within a body 1.3, which is assigned to the stator 1, by a bearing, here two rolling bearings 3, rotatably mounted.
- a bearing here two rolling bearings 3, rotatably mounted.
- On the shaft 2.1 a arranged inside the angle measuring code disc 2.2 is attached.
- the code disk 2.2 is scanned photoelectrically by a scanning device in the examples shown.
- Corresponding photosensitive detectors are located on a printed circuit board 1.3 attached to the body 1.3.
- the circuit board 1.31 also electrical components for signal shaping - arranged, for example, for amplification and digitization - the scanning signals supplied by the detectors.
- An electrical connection between the angle measuring device and subsequent electronics is produced via a connecting cable, not shown in the figures, so that electrical signals and electrical energy can be transmitted between the subsequent electronics and the angle measuring device.
- the stator 1 of the angle measuring device is connected via a compensating coupling 1.2 on a machine part 5.1, z. B. attached to a stationary motor housing.
- a compensating coupling 1.2 To accommodate the compensating coupling 1.2, a hollow cylindrical recess is machined on the machine part 5.1, into which the motor shaft 5.2 projects centrally.
- the compensation coupling 1.2 comprises a resilient component 1.21 and a comparatively stiff ring 1.22. and serves to ensure that misalignment between the shaft 2.1 and the motor shaft 5.2 does not lead to unacceptably high loads in the rolling bearings 3.
- the resilient member 1.21 which is made of steel is shown in perspective.
- the compensation coupling 1.2 is integrally formed from a steel sheet.
- first holes 1.211 for fixing the resilient member 1.21 with the ring 1.22
- second bores are provided 1.212 for the attachment of the resilient member 1.21 on the body 1.3 of the stator 1.
- the ring 1.22 is radially aufspreitz- bar using a screw mechanism 1.23, so that it can be clamped to the inner wall of the machine part 5.1. In this way, a very good and relatively large area contact between the machine part 5.1 and the stator 1 can be produced.
- Such a compensation coupling 1.2 allows a radially and axially elastic but torsionally rigid connection of the stator 1 with a machine part ⁇ .l
- the angle measuring device further comprises on the stator 1 as an element with vibration-damping property according to the first Embodiment, a potting compound 4 made of a polymer material. This is arranged between the compensating coupling 1.2, in particular between the resilient member 1.21 and the body 1.3.
- potting compound 4 is a silicone gel containing fillers.
- the potting compound 4 has a so-called inherent tackiness, so that it adheres or adheres both to the body 1.3 of the stator 1 and to the resilient component 1.21 and to the ring 1.22. By this measure, the measurement accuracy of the angle measuring device can be improved.
- a damping effect is achieved in the region of the natural frequency of the angle measuring device, which surprisingly improves the precision of the angle measurement.
- an element for. B. in the form of the potting compound 4, which is suitable for damping vibrations and is in contact both with the compensating coupling 1.2 and with the body 1.3.
- the internal temperature of the angle measuring device in particular the temperatures of the body 1.3 but also of the printed circuit board 1.31 can be reduced when a potting compound 4 is used.
- the motor shaft 5.2 represents a heat source through which heat is conducted into the angle measuring device via the shaft 2.1.
- the machine part 5.1 that is, for example, the motor housing, can be understood as a heat sink.
- the potting compound 4 now reduces the thermal conduction resistance between the machine part 5.1 and the shaft 2.1, which leads to a decrease in temperature in the angle measuring device.
- the electronic components on the circuit board 1.31 are exposed to less high temperatures, which leads to improved measurement behavior of the angle measuring device and to increase the life.
- the angle measuring device on the stator 1 as a member having a vibration-damping property of a molded part 4 '.
- the molded part 4 ' is made of polymer material, here an elastomeric material, and attached to the elastic component 1.21 of the compensating coupling 1.2, in particular adhesively bonded.
- the molded part 4 ' is attached to the resilient member 1.21 so that it is arranged with an axial projection with respect to the resilient member 1.21.
- the molded part 4 ' is arranged according to FIGS. 4 and 6 between the compensating coupling 1.2, in particular between the resilient component 1.21 of the compensating coupling 1.2 and the body 1.3, in which case the molded part 4' which is largely concealed in the view of FIG half black is shown.
- the molded part 4 ' When installed, the molded part 4 'is at least axially biased against the body 1.3. Notwithstanding the embodiment shown in FIG. 5, to reduce the internal stresses, the molded part 4 'can be configured with recesses, for example with radially oriented recesses.
- the measurement behavior in particular the measurement accuracy of the angle measuring device, can also be improved by the design according to the second exemplary embodiment.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008035510 | 2008-07-30 | ||
DE102009027536A DE102009027536A1 (de) | 2008-07-30 | 2009-07-08 | Winkelmesseinrichtung |
PCT/EP2009/058909 WO2010012581A1 (de) | 2008-07-30 | 2009-07-13 | Winkelmesseinrichtung mit schwingungsdämpfender statorkupplung |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2307857A1 true EP2307857A1 (de) | 2011-04-13 |
Family
ID=41461842
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09780501A Ceased EP2307857A1 (de) | 2008-07-30 | 2009-07-13 | Winkelmesseinrichtung mit schwingungsdämpfender statorkupplung |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2307857A1 (de) |
DE (1) | DE102009027536A1 (de) |
WO (1) | WO2010012581A1 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010021367B4 (de) | 2010-05-25 | 2012-03-08 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Optische Winkelmesseinrichtung |
DE102012207123A1 (de) | 2011-04-29 | 2012-10-31 | Koenig & Bauer Ag | Bogenrotationsdruckmaschine mit mindestens einem direkt angetriebenen Zylinder |
DE102011086462A1 (de) | 2011-11-16 | 2013-05-16 | Dr. Johannes Heidenhain Gmbh | Winkelmesseinrichtung |
EP2693170B1 (de) * | 2012-07-31 | 2014-09-24 | SICK STEGMANN GmbH | Statorkupplung |
DE102013202560A1 (de) * | 2013-02-18 | 2014-08-21 | Dr. Johannes Heidenhain Gmbh | Winkelmesseinrichtung |
CN117269530A (zh) * | 2023-11-17 | 2023-12-22 | 山东派蒙机电技术有限公司 | 一种提高激光转台控制精度的旋转编码器 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3645114A (en) * | 1970-05-08 | 1972-02-29 | Shepherd Machinery Co | Flexible rotary drive train having splined coupling with elastomeric cushions |
DE19629585C2 (de) | 1995-09-06 | 1998-12-10 | Heidenhain Gmbh Dr Johannes | Winkelmeßeinrichtung |
US6191510B1 (en) * | 1997-12-19 | 2001-02-20 | 3M Innovative Properties Company | Internally damped stator, rotor, and transformer and a method of making |
DE102006010490B4 (de) * | 2006-03-01 | 2007-11-29 | Baumer Thalheim Gmbh & Co. Kg | Drehgeber |
-
2009
- 2009-07-08 DE DE102009027536A patent/DE102009027536A1/de not_active Withdrawn
- 2009-07-13 EP EP09780501A patent/EP2307857A1/de not_active Ceased
- 2009-07-13 WO PCT/EP2009/058909 patent/WO2010012581A1/de active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2010012581A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE102009027536A1 (de) | 2010-02-04 |
WO2010012581A1 (de) | 2010-02-04 |
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Legal Events
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Effective date: 20140728 |