EP0945630A1 - Actionneur linéaire sans tige - Google Patents

Actionneur linéaire sans tige Download PDF

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Publication number
EP0945630A1
EP0945630A1 EP99105323A EP99105323A EP0945630A1 EP 0945630 A1 EP0945630 A1 EP 0945630A1 EP 99105323 A EP99105323 A EP 99105323A EP 99105323 A EP99105323 A EP 99105323A EP 0945630 A1 EP0945630 A1 EP 0945630A1
Authority
EP
European Patent Office
Prior art keywords
detection means
housing
linear drive
drive according
evaluation unit
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.)
Granted
Application number
EP99105323A
Other languages
German (de)
English (en)
Other versions
EP0945630B1 (fr
Inventor
Kurt Dr. Stoll
Thomas Dr. Reininger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Festo SE and Co KG
Original Assignee
Festo SE and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Festo SE and Co KG filed Critical Festo SE and Co KG
Publication of EP0945630A1 publication Critical patent/EP0945630A1/fr
Application granted granted Critical
Publication of EP0945630B1 publication Critical patent/EP0945630B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • F15B15/2869—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using electromagnetic radiation, e.g. radar or microwaves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/082—Characterised by the construction of the motor unit the motor being of the slotted cylinder type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • F15B15/2861—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using magnetic means

Definitions

  • the invention relates to a rodless linear drive, with a housing interior delimiting Housing that opens into the interior of the housing Has longitudinal slot, with a drive part that a in Housing interior longitudinally movable drive section and one through the longitudinal slot to the outside protruding driver section, the longitudinal slot at least on the drive part on both sides in the longitudinal direction adjacent lengths by means of a Sealing tape is closed, and with a position determining device to determine the relative position of drive part and housing, on the housing or on the drive part provided first detection means and with these cooperating, provided on the other component has second detection means and the one the first and / or second detection means assigned evaluation unit contains.
  • the housing-side detection means are there from two on the two slot flanks of the longitudinal slot arranged resistance strips formed. One in contact with the two resistance strips standing sliding contact arranged on the driver section provides the drive part-side detection means.
  • the evaluation unit is from one side with the Resistance measuring strips connected so that they are in Changing depending on the position of the contact point Resistance of the two shorted sections of the Measure resistance measuring strips and from them the relative position of the output part and housing can determine.
  • a rodless linear drive with position determining device to create the easy to assemble is and reduces the manufacturing costs.
  • the sealing tape runs at a distance from the longitudinal slot in the Housing interior.
  • the drive part side Arrange detection means so that they with the section of the longitudinally spaced Seal tape work together, the assembly of the drive part Detection means due to the sufficient available space is simplified.
  • the housing-side detection means can already the manufacture of the sealing tape provided on this become.
  • the evaluation unit can only be used with the first or second detection means. In this case the other means of registration do not require a connection point to the evaluation unit, so that it is one have a simple structure and therefore with little effort can be produced.
  • the first Detection means for the relative movement of the housing and Drive part for example, in the field of cause second magnetic field changing magnetic field
  • the second detection means being magnetic field dependent Generate detection signal that of the evaluation unit is fed to determine the relative position.
  • This may be the first means of registration several electrically conductive and / or magnetizable or permanent magnetic detection elements that act in the direction of the relative movement of the drive part and Housing, for example, regularly spaced apart are arranged.
  • First detection means designed in this way are particularly easy to manufacture.
  • the second Detection means contain a coil arrangement. This can be used as a magnetic field dependent sensor. It is possible that in the area of the coil arrangement existing magnetic field from the coil arrangement itself is caused. This way the first Detection means itself no magnetic field in the area Generate coil assembly so that for their manufacture cheaper, non-permanent magnetic and in particular electrically conductive material can be used can.
  • the relative position is via such a measurement signal can also be determined if the starting position of Housing and drive part unknown before the relative movement are. This means that none known to the evaluation unit Starting position must be defined to the relative position to be able to determine.
  • a particularly simple position determination can take place if the relative position over time between sending out the measurement signal and arrival of one of the Measurement signal and the second detection means triggered Signal response is determined on the evaluation unit.
  • the first detection means on Sealing tape may be provided and one in the longitudinal direction of the sealing tape extending conductor arrangement included. This enables simple transmission of the measurement signal or the signal response.
  • the second detection means on the drive part be provided and a discontinuity in the Induce conductor arrangement, the measurement signal at the Discontinuity is a return to the evaluation unit Triggers signal response.
  • the discontinuity thus defines the relative position of the drive part and Casing.
  • the signal response can in particular be from a Reflection of the measurement signal at the point of discontinuity be educated.
  • a reflection can be of the second Detection means caused in a particularly simple manner become.
  • the second detection means expediently contain a magnetic device whose magnetic field is on the conductor arrangement acts and the discontinuity evokes.
  • the conductor of the conductor arrangement has magnetostrictive properties on so that this is due to the action of the magnetic field deformed, the deformation being the point of discontinuity represents.
  • the conductor arrangement at least one externally accessible electrical Head has.
  • the second Detection means one in contact with the electrical conductor have standing conductor tap, the contact point between conductor tap and electrical conductor Represents discontinuity.
  • the conductor tap can at the contact point in a particularly simple manner a change in resistance of the conductor, from the incoming Seen measurement signal ago, what is a reflection at the point of discontinuity.
  • the conductor tap is designed as a shorting bar, so to speak.
  • a rodless linear drive 1 is shown, which delimits a housing interior 2 Housing 3 has.
  • the housing 3 contains one extending in the longitudinal direction 4, tubular Housing body 5, which at its two end regions 6, 7 by means of a housing cover 8, 9 is closed.
  • On the housing body 5 is a wall at a circumferential point radially penetrating longitudinal slot 12 provided, which opens into the housing interior 2 and in the longitudinal direction, for example, over the entire Length of the housing body 5 extends.
  • a drive part 13 is provided on the housing 3 so as to be longitudinally movable, one in the housing interior 2 longitudinally movable arranged drive section 14 and one through the longitudinal slot 12 driver portion 15 projecting outwards having.
  • the drive section thus provides the force-absorbing, driven part of the drive part 13, on which the driver section 15 is provided. This serves for example, objects not shown such as grippers, tools, workpieces or sensors wear that by means of the linear drive 1 in a desired Position should be brought.
  • FIG. 1 it is a fluid-operated, especially pneumatic Linear drive 1, the drive section 14 of a piston 18 is formed.
  • the rodless linear drive 1 to be electrically driven, for example, the drive section 14 via a longitudinal spindle, a Toothed or V-belts or the like can be moved.
  • the housing interior 2 has an approximately circular cylindrical cross section.
  • the piston 18 is in the Housing interior 2 arranged longitudinally movable. He has an elongated, tube-like piston body 22, which at its two longitudinal end regions 23, 24 of each have a substantially cylindrical piston end piece 25, 26 is closed. Inside the piston body 22 is thus between the two piston end pieces 25, 26 Piston interior 27 limited.
  • the piston 18 lies in the region of the piston end pieces 25, 26 sealing on the inner wall facing the housing interior 2 30 of the housing body 5.
  • the Pistons on the two piston end pieces 25, 26 each a circumferential sealing arrangement 31, 32, which according to the example is formed by a sealing ring.
  • the piston 18 in the housing interior 2 of the housing 3 is additionally on each piston end piece 25, 26 Guide ring 33, 34 provided.
  • the two fluid chambers 37, 38 are in the region of the longitudinal slot 12 closed by means of a sealing tape 43, the inside of the slot flanks 44, 45 of the longitudinal sections extending along the fluid chambers 37, 38 46, 47 of the longitudinal slot 12 abuts.
  • the sealing tape 43 is preferably seen in cross section trapezoidal, the two opposite, sloping side surfaces 48, 49 of the sealing tape on also inclined, radially towards each other Slit flanks of the longitudinal slot 12 lie flat.
  • the sealing tape 43 is in the area with its two ends the housing cover 8, 9 fixed to the housing 3. Between these two fastening points 54, 55 is the sealing tape 43 stretched in its direction. Since it is usually made of elastic sealing material, are to increase the tensile strength according to FIG. 2 in the embodiment two in the sealing tape 43 continuously in the direction of extension of the sealing tape 43 extending reinforcing strands 56, 57 arranged. These can be made of a solid plastic be made or consist of metal. It understands yourself, that in a modification to the embodiment too only one or more than two reinforcement strands could be provided, which are also on the outside of the sealing tape 43 could be arranged.
  • actuated linear drive fulfills the sealing tape 43 no sealing function, but it protects it from contamination, that could penetrate into the housing 3.
  • the linear drive 1 has a Position determining device 58, which is dash-dotted in FIG. 1 is indicated.
  • Position determining device 58 which is dash-dotted in FIG. 1 is indicated.
  • the relative position of drive part 13 and housing 3 can the position of the provided on the driver section 15, object to be positioned as required become.
  • the position determination device 58 first provided according to the example on the sealing tape 43 Acquisition means 59 and cooperating with them, second detection means provided here on the drive part 13 60 on.
  • the first detection means 59 therefore in the following as the housing side and the second detection means 60 as the drive part side Means of detection.
  • Both the housing side and the drive part side Detection means 59, 60 are only in FIG. 1 shown schematically in dash-dotted lines.
  • the drive part side Detection means 60 are preferably on the Drive section 14 or in the connection area 52 between Drive section 14 and driver section 15 arranged.
  • the housing-side detection means 59 extend along the sealing tape 43 substantially above it whole length.
  • the drive part-side detection means 60 work with them depending on the current relative position between drive part 13 and Housing 3 assigned point of the housing side Detection means 59 together, which as detection point 61 be designated. This detection point 61 is located in the embodiment on the section of the housing side Detection means 59 or the sealing tape 43, the runs inside the feed-through opening 53.
  • the passage opening 53 can face the piston interior 27 be open as shown in FIG. 1. This gives there is a lot of space for arranging the drive part side Detection means 60 in the area of the assignment office 61. Also the assembly of the drive part Detection means 60 can thus be carried out without problems become.
  • An evaluation unit is provided with the housing-side detection means 59 64 of the position determining device 58 connected, the signals from the assigned housing-side Detection means 59 receive or signals to them Can send means of registration. By evaluating this The evaluation unit 61 can signal the current relative position between the drive part 13 and the housing 3 determine.
  • the evaluation unit only with the drive part Detection means 60 connected.
  • This connection is, for example, by means of electrical connecting conductors 66 realized.
  • the housing-side detection means 59 and the drive part-side detection means 60 work contactlessly together so that during the relative movement the drive part 13 and the housing 3 no additional Friction or no additional wear occurs.
  • the basic principle of the operation of the position determining device 58 is based on the fact that the housing-side detection means 59 during the relative movement of housing 3 and drive part 13 or Sealing tape 43 and drive part 13 are in the area of on the drive part-side detection means 60 changing magnetic field cause, the drive part side detection means 60 a magnetic field dependent detection signal generate that the evaluation unit 64 for determining the Relative position is supplied.
  • the drive part-side detection means 60 at least one magnetic field-dependent sensor 67, which in the embodiment 3 is formed by a coil 68. This coil is connected to a voltage via the evaluation unit 64 applied so that it produces the magnetic field itself.
  • the housing-side detection means 59 are in the sealing tape spaced apart along its direction arranged, magnetizable and / or electrically conductive detection elements 69 formed.
  • the detection elements can, for example, of spaced individual metal balls can be formed. However, it is also possible, the individual detection elements connect with each other, thereby introducing the Detection elements 69 in the sealing tape 43 during manufacture is much easier. For example the detection elements 69 to a chain or band-like Structure.
  • the external form of the In principle, detection elements 69 can be freely selected.
  • the coil 68 surrounds the sealing tape 43 in the area of the detection point 61. With a relative movement of the drive part 13 and housing 3, the coil 68 moves along the Sealing tape 43, the magnetic flux in the Coil through the sensing elements moved through the coil 68 69 changes, which also becomes one changing voltage on the coil 68 leads from the evaluation unit 64 can be measured.
  • the voltage signal on the coil 68 serves as a measure of the path that during the Relative movement between drive part 13 and housing 3 covered has been. Starting from a known, defined one The starting point can be the distance covered current relative position of drive part 13 and housing 3 can be determined in the evaluation unit 64.
  • the detection elements 69 on the sealing tape 43 can simultaneously determine the distance traveled Distance also the direction of movement of the relative movement be determined.
  • the detection elements 69 have irregular distances, so that during the Relative movement recorded by the evaluation unit 64 detection signal formed by the voltage on the coil 68 certain, periodically recurring voltage profiles has, the voltage curves depending on the direction of movement are different.
  • the periodically recurring, voltage curves containing the direction code, so to speak can also by in a section of the Sealing tape 43 different detection elements 69 caused be, the different detection elements 69 different voltage changes of the Cause coil voltage.
  • Position determining device 58 have the drive part side Detection means 60 via only one Coil 68.
  • these could also contain a coil arrangement, one with the evaluation unit 64 connected measuring coil is provided, the causes the detection signal. At least one more The coil of the coil arrangement could then be used as an excitation coil be formed, which is present in the area of the measuring coil Magnetic field.
  • the excitation coil so to speak and the measuring coil simultaneously from the single coil 68 educated.
  • the coil 68 can also be part of an oscillating circuit 73 be, wherein, for example, a series resonant circuit is realized where the capacitor 74 and the ohmic Resistor 75 is provided in the evaluation unit 64, so that the connection to the coil 68 via the connecting conductor 66 takes place. It is understood that the capacitor 74 and the resistor 75 together with the coil 68 also on Drive part 13 could be arranged. If the ohmic Resistance of the coil 68 together with that of the connecting conductor 66 is already large enough, the separate Ohmic resistance 75 is also eliminated.
  • the changing mood serves here of the resonant circuit 73 as a detection signal via which the Evaluation unit 64 the distance traveled and thus also the current relative position of drive part 13 and Housing 3 can determine.
  • the Magnetic field-dependent sensor 67 of the drive part-side detection means 60 in the exemplary embodiment according to FIG. 4 for example from a magnetoresistive sensor or a Hall sensor, with another any magnetic field-dependent sensor can be used can.
  • the existing in the area of the sensor 67 itself changing magnetic field is, for example, from the housing side Detection means 59 generated.
  • detection means 59 is as in the previous embodiment spaced apart in the direction of extension of the Sealing tape 43 arranged detection elements 69, wherein this in the present case in the form of permanent magnets are executed.
  • the sensing elements 69 are preferred connected together so that a kind of magnetic tape 78th arises.
  • the magnetic tape 78 can already at Production of the sealing tape 43 introduced into this are or can be arranged on the outside of the sealing tape 43.
  • the connecting the individual detection elements 69 Longitudinal strands 79, 80 can simultaneously function as Reinforcement strands 56, 57 in the sealing tape 43 take over sufficient stability of the sealing tape 43 in its Ensure direction of extension seen.
  • Each of the permanent magnetic detection elements 69 is generated a local magnetic field 81, which is schematic in FIG. 4 is indicated.
  • sensor 67 moves along of the sealing tape 43, whereby it is replaced by the successive local magnetic fields 81 applied to the detection elements 69 becomes. That caused in sensor 67 Detection signal is forwarded to the evaluation unit 64 and evaluated there to determine the relative position.
  • a coding by the The detection elements 69 are arranged or configured, so that the distance covered from the detection signal Distance and the direction of movement of the relative movement let determine what the determination of momentous relative position is possible.
  • the first Detection means 59 can also be provided on the drive part 13, so that they are the drive part-side detection means form.
  • the housing-side detection means are here formed by the second detection means 60.
  • sealing tape 43 to provide a plurality of spaced-apart magnetic field-dependent sensors 67, for example, several coils 68 that the represent second, housing-side detection means 60.
  • the first detection means 59 on the drive part side could then be from a permanent magnetic or magnetizable and in the case of one formed by a coil 68 magnetic field dependent sensor 67 from an electrical conductive detection element 69 may be formed.
  • Dependent on from the relative position of housing 3 and drive part 13 acts that arranged on the drive part 13 Detection element 69 mainly on the magnetic field or dependent Sensors 67 a at the assignment point 61 are present on the sealing tape 43. Because of the the assignment point 61 acting magnetic field Evaluation unit determine which of the magnetic field-dependent Sensors 67 is applied to the sealing tape 43, and thus the relative position of housing 3 and drive part 13 determine.
  • the arrangement of the first and second detection means 59, 60 is therefore compared to the exemplary embodiments according to FIG 3 and 4, so to speak, vice versa, now the Magnetic field-dependent sensors on the sealing tape 43 and one or Several detection elements 59 are provided on the drive part 13 are.
  • the advantage of this modification is that the current relative position of drive part 13 and Housing 3 does not have the last determined relative position and the relative movement that followed is determined, but results directly from it, which of the magnetic field-dependent sensors 67 on the sealing tape 43 is acted upon by the detection element 59 on the drive part side becomes. The more sensors 67 are provided on the sealing tape 43 are and the smaller their distance from each other is selected, the more precise the relative position can be be determined between drive part 13 and housing 3.
  • the evaluation unit 64 now only with the first detection means 59 connected, which in turn is the housing-side detection means represent. This eliminates the need to move the Connection conductor 66 with the drive part 13. Die Connection between the housing-side detection means 59 and the evaluation unit 64 is, for example, in Area of one of the attachment points 54, 55 between Sealing tape 43 and housing 3 are provided.
  • connection is made as in the previous ones Embodiments via one or more electrical connecting conductors 66, alternatively also a connection can be realized with galvanic isolation could.
  • the evaluation unit 64 and the housing-side detection means 59 inductively with one another be coupled.
  • the basic principle of the design variants of the position determining device 58 is based on FIGS. 5 and 6 that the evaluation unit 64 a measurement signal on the transmits housing-side detection means 59 through Interaction between the housing side and the second, drive part side detection means 59, 60 for Determination of the relative position is used.
  • the signal form of the measurement signal can in principle be arbitrary be, for example pulses, pulse trains or Waves, especially high-frequency waves, come into question.
  • the relative position determined in the evaluation unit 64 in that the time between sending the measurement signal and arrival one of the measurement signal and the drive part Detection means 60 via the housing-side detection means 59 signal response returning to the evaluation unit 64 is determined. Over the period and the known transmission speed of measurement signal and Signal response can be the relative position of Drive part 13 and housing 3 are determined.
  • the evaluation unit 64 When determining the position by sending a measurement signal it is possible to find the relative position directly in the To determine evaluation unit 64.
  • the evaluation unit 64 known, defined starting positions between drive part 13 and housing 3 does not have to be fixed because the current relative position does not exceed the distance traveled, but directly through the Evaluation of the measurement signal or the signal response takes place.
  • Both the measurement signal and the signal response are transmitted via a conductor arrangement 84, which the housing-side Detection means 59 forms.
  • the drive part side Detection means 60 cooperate in this way the conductor arrangement 84 together that they in this at the Detection point 61 cause a discontinuity 85, at which the emitted by the evaluation unit 64 Measurement signal the signal response returning to the evaluation unit triggers.
  • At least one of the conductors of conductor arrangement 84 can doing so to increase the tensile strength of the sealing tape 43 serving reinforcement strand 56, 57 form.
  • the conductor arrangement 84 has in the exemplary embodiment 5 over at least one and preferably over two externally accessible electrical conductors 88, 89, see above that measurement signal and signal response in the form of electrical Signals are present.
  • the electrical conductors 88, 89 are expediently on one of the outer surfaces of the sealing tape 43 provided that has no sealing function. According to the example, the electrical conductors 88, 89 are on the rear surface 90 facing housing interior 2 of the sealing tape 43 arranged.
  • the discontinuity 85 is thereby in this embodiment caused that a conductor tap 91 of the drive part Detection means with the or electrical conductors 88, 89 is in contact, the Contact point of discontinuity 85 corresponds.
  • the evaluation unit can 64 opposite end of the associated electrical Conductor 88, 89 by means of a corresponding Resistance adjusted to reflect the reflection of the Discontinuity from in the direction of propagation of the measurement signal continuous refractive signal at the end of the conductor avoid.
  • the measurement signal is formed by an electrical pulse.
  • the conductor tap 91 of the drive part-side detection means 60 is designed here as a shorting bar, the the two electrical conductors 88, 89 of the two-wire line electrically short-circuits at the point of discontinuity 85.
  • the two-wire line forms a so-called "Lecher line", the measurement signal in particular is formed by a high frequency wave.
  • the measurement signal is Measurement signal completely reflected at discontinuity 85, where the reflection forms the signal response, which is 180 ° out of phase with respect to the measurement signal.
  • a standing wire is thus formed in the second wire line Wave out.
  • the Runtime measurement the relative position between the drive part 13 and housing 3 determined in the evaluation unit 64.
  • the position determining device 58 act on the drive part side detection means 60 contactless the housing-side detection means 59. These are formed by the conductor assembly 84 which, in contrast to the previous embodiments play at least one contains magnetostrictive, electrically conductive conductor 96.
  • the drive part-side detection means 60 comprise one Magnet device 94, which in the present case by a Permanent magnet is formed, the magnetic field on the magnetostrictive conductor 96 of the conductor arrangement 84 acts and causes the discontinuity 85.
  • the magnetostrictive conductor 96 is, for example an amorphous or nanocrystalline, ferromagnetic conductor. By the influence of a Magnetic field, this is ferromagnetically saturated, causing a deformation (magnetostriction) of the magnetostrictive Conductor 96 is caused. This Deformation point forms the discontinuity 85 the measurement signal emitted by the evaluation unit 64 is reflected and broken.
  • a first possibility is that the reflection forms the signal response. That is based on the Discontinuity 85 in the direction of propagation of the Measurement signal along the magnetostrictive conductor 96 on Spreading refractive signal would be at the evaluation unit 64 reflected the opposite end one more time become. This could lead to errors in the calculation of the Lead relative position. That is why the magnetostrictive Conductor 96 on its opposite the evaluation unit 64 Terminated by means of a resistor 97 in such a way that the reflection factor is zero and therefore Adaptation exists.
  • the second possibility for the formation of the signal response results itself through the amorphous or nanocrystalline formation of the magnetostrictive conductor 96.
  • discontinuity 85 At the point of discontinuity 85 one emerges simultaneously in both Mechanical wave propagating directions, in particular Torsion shaft.
  • the one returning in the direction of the evaluation unit 64 mechanical wave provides the signal response represents and can therefore due to their known propagation speed about the runtime measurement for Determination of the relative position of housing 3 and drive part 13 serve.
  • the distance from the discontinuity 85 together with the refractive signal to that of the evaluation unit opposite end of the conductor 96 spreading further mechanical shaft is preferably on this The end of the conductor is so attenuated that there is no significant reflection takes place to errors in determining the relative position to be avoided in the evaluation unit 64.
  • the evaluation unit also leads with these design options 64 a transit time measurement of the measurement signal and Signal response through, from which they get the relative position determined between drive part 13 and housing 3.
  • FIG. 6 is a further variant for the execution of the Position determining device 58 shown.
  • the magnetostrictive conductor in the form of a tube-like one Sound wave guide 100 is formed, which in FIG. 6 is shown in broken lines.
  • Coaxial within the Sound waveguide 100 is an electrical measuring conductor 101 arranged, via which the measurement signal starting from the evaluation unit 64 is transmitted.
  • the discontinuity 85 triggers the incoming measurement signal via the Sound waveguide 100 returning to the evaluation unit 64 first and one opposed to this further propagating second mechanical wave, where it is in the present case a torsion shaft acts.
  • the first mechanical wave is the Signal response represents, and the second mechanical wave Damped at the end of the conductor to avoid reflections.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Toxicology (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Actuator (AREA)
EP99105323A 1998-03-26 1999-03-16 Actionneur linéaire sans tige Expired - Lifetime EP0945630B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813371 1998-03-26
DE19813371A DE19813371C2 (de) 1998-03-26 1998-03-26 Kolbenstangenloser Linearantrieb

Publications (2)

Publication Number Publication Date
EP0945630A1 true EP0945630A1 (fr) 1999-09-29
EP0945630B1 EP0945630B1 (fr) 2004-07-28

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EP99105323A Expired - Lifetime EP0945630B1 (fr) 1998-03-26 1999-03-16 Actionneur linéaire sans tige

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EP (1) EP0945630B1 (fr)
JP (1) JPH11311208A (fr)
DE (2) DE19813371C2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007061386B4 (de) * 2007-12-19 2021-07-08 manroland sheetfed GmbH Rotationsdruckmaschine mit Leichtbauelementen

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0112985A2 (fr) * 1982-12-02 1984-07-11 Dr. Johannes Heidenhain GmbH Dispositif pour mesurer des mouvements d'avance
DE9101734U1 (fr) * 1991-02-15 1991-05-23 Hygrama Ag, Rotkreuz, Ch
EP0492751A1 (fr) * 1990-12-20 1992-07-01 MANNESMANN Aktiengesellschaft Vérin commandé par un fluide sous pression avec un cylindre profilé
EP0513837A1 (fr) * 1991-05-17 1992-11-19 Kabushiki Kaisha Sg Vérin sans tige
DE4241189A1 (de) * 1992-12-03 1994-06-09 Mannesmann Ag Einrichtung zur Positionsermittlung bei einem druckmittelbetriebenen Arbeitszylinder
DE29508517U1 (de) * 1995-05-23 1995-08-10 Festo Kg Kolbenstangenloser Linearantrieb
DE29518539U1 (de) * 1995-11-22 1996-01-18 Festo Kg Positionserfassungsvorrichtung

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0112985A2 (fr) * 1982-12-02 1984-07-11 Dr. Johannes Heidenhain GmbH Dispositif pour mesurer des mouvements d'avance
EP0492751A1 (fr) * 1990-12-20 1992-07-01 MANNESMANN Aktiengesellschaft Vérin commandé par un fluide sous pression avec un cylindre profilé
DE9101734U1 (fr) * 1991-02-15 1991-05-23 Hygrama Ag, Rotkreuz, Ch
EP0513837A1 (fr) * 1991-05-17 1992-11-19 Kabushiki Kaisha Sg Vérin sans tige
DE4241189A1 (de) * 1992-12-03 1994-06-09 Mannesmann Ag Einrichtung zur Positionsermittlung bei einem druckmittelbetriebenen Arbeitszylinder
DE29508517U1 (de) * 1995-05-23 1995-08-10 Festo Kg Kolbenstangenloser Linearantrieb
DE29518539U1 (de) * 1995-11-22 1996-01-18 Festo Kg Positionserfassungsvorrichtung

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JPH11311208A (ja) 1999-11-09
DE19813371C2 (de) 2001-12-20
DE19813371A1 (de) 1999-10-07
EP0945630B1 (fr) 2004-07-28
DE59910037D1 (de) 2004-09-02

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