EP3471115A1 - Dispositif de génération d'impulsion de tension lors d'une rotation d'un arbre monté de manière rotative autour de l'axe de rotation - Google Patents

Dispositif de génération d'impulsion de tension lors d'une rotation d'un arbre monté de manière rotative autour de l'axe de rotation Download PDF

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Publication number
EP3471115A1
EP3471115A1 EP17196643.5A EP17196643A EP3471115A1 EP 3471115 A1 EP3471115 A1 EP 3471115A1 EP 17196643 A EP17196643 A EP 17196643A EP 3471115 A1 EP3471115 A1 EP 3471115A1
Authority
EP
European Patent Office
Prior art keywords
magnet arrangement
rotation
magnet
holding
axis
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
EP17196643.5A
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German (de)
English (en)
Other versions
EP3471115B1 (fr
Inventor
Tilo Sperling
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.)
Baumer IVO GmbH and Co KG
Original Assignee
Baumer Mds GmbH
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 Baumer Mds GmbH filed Critical Baumer Mds GmbH
Priority to EP17196643.5A priority Critical patent/EP3471115B1/fr
Publication of EP3471115A1 publication Critical patent/EP3471115A1/fr
Application granted granted Critical
Publication of EP3471115B1 publication Critical patent/EP3471115B1/fr
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Anticipated expiration legal-status Critical

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/16—Rectilinearly-movable armatures
    • H01F7/1607—Armatures entering the winding

Definitions

  • the invention relates to a device for generating a voltage pulse during rotation of a rotatably mounted about a rotation axis shaft. Such devices are used to ensure that even in the event of a power failure, a measurement can be made and revolutions of the shaft do not go unnoticed.
  • the prior art discloses devices having a first magnet arrangement and a second magnet arrangement rotatable about the rotation axis relative to the first magnet arrangement, wherein the first magnet arrangement is held bistable and has a first stable holding position and a second, from the first holding position along the axis of rotation having spaced, stable holding position.
  • the disadvantage of such a configuration is that they are comparatively bulky.
  • the object of the invention is to provide a solution in which the device takes up less space.
  • a north-south direction of the first magnet arrangement and / or the second magnet arrangement extends transversely to the axis of rotation.
  • the north-south directions of both magnet arrangements extend transversely to the axis of rotation.
  • the north-south direction of the first magnet arrangement or the second magnet arrangement can run parallel to the axis of rotation.
  • Such a configuration may be particularly space-saving in a direction perpendicular to the axis of rotation.
  • the north-south direction of the first magnet arrangement and / or the second magnet arrangement can run perpendicular to the axis of rotation.
  • Such a configuration can be particularly space-saving in a direction parallel to the axis of rotation.
  • the device may include a voltage generating device that generates a voltage pulse as the first magnet assembly transitions from the first stop position to the second stop position.
  • a voltage generating device that generates a voltage pulse as the first magnet assembly transitions from the first stop position to the second stop position.
  • Such a transition may be, in particular, a snap-over in which, when a threshold is exceeded, a sudden change is made from the first holding position to the second holding position.
  • the voltage generating device may comprise a coil and the first magnet arrangement in the second holding position have a different distance from the coil than in the first holding position.
  • the first magnet arrangement can protrude at least partially into the coil in at least one of the two holding positions.
  • the voltage generating device may comprise two coils.
  • the two coils may for example be mounted on top and bottom of a circuit board to be particularly space-saving and easy to assemble.
  • the voltage generating device may have at least one capacitor for generating the voltage.
  • the voltage can be generated for example by changing two plates of the capacitor to each other.
  • Such a solution can be, for example, more space-saving than a solution with a coil.
  • the voltage generating device may comprise at least one piezoelectric element, in which a voltage is generated by a change in one dimension, for example a length.
  • the device may have a holding device which holds the first magnet arrangement in the first and in the second holding position. This allows for easy holding.
  • the holding device may be elastically deformable, so that a movement from the first holding position to the second holding position and back is possible.
  • the holding device may comprise elastically deformable elements such as springs.
  • the holding device may be mechanically bistable.
  • the holding device as be configured bistable element, in which an abrupt transition between the first holding position and the second holding position takes place.
  • the holding device may be membrane-shaped.
  • the holding device may be designed as a flat, circular element. It can be cut, stamped and / or embossed from a sheet.
  • the holding device may be attached along a circumference.
  • an element to which the holding device is attached for example, have a groove into which the holding device can be used.
  • the holding device can be fastened at several points along the circumference.
  • a part of the shaft may be formed as a magnet assembly.
  • the shaft or one end of the shaft can be magnetized.
  • a part of the holding device may be formed as a magnet arrangement.
  • a part may be magnetized.
  • the device can be particularly space-saving if the axis of rotation passes through the first and / or the second magnet arrangement. The space required to the side is thereby reduced.
  • a holding element may extend around the first magnet arrangement.
  • the first magnet arrangement may be arranged in a center of a circular, membrane-shaped holding device.
  • the holding device can enclose or surround the first magnet arrangement.
  • the first magnet arrangement can be held between at least two holding elements.
  • the holding elements can be configured, for example, as arms or bars which allow the first magnet arrangement to snap over from the first holding position into the second holding position.
  • the retaining elements can be elastically or elastically deflectable in order to allow repeated movement with a well-defined force.
  • the holding elements may be part of the holding device.
  • At least one holding element can be arranged laterally next to the first magnet arrangement with respect to the axis of rotation.
  • the entire holding device can be arranged laterally next to the first magnet arrangement.
  • the first magnet assembly may be clamped.
  • the first magnet arrangement can have a groove for fastening.
  • the first magnet arrangement can be fastened, for example, to a membrane-type holding device or a flat fastening element of a holding device.
  • the holding device may comprise at least a part of a printed circuit board.
  • the circuit board further elements can be arranged, which can be used for the power supply or for the processing of signals. Therefore, additional external elements can be dispensed with.
  • the embodiment is particularly flat when the plane of the printed circuit board passes through the first magnet arrangement.
  • the holding device can be biased in one of the two holding positions to the other holding position.
  • a holding device may for example have a first, stable holding position, wherein the first magnet arrangement in a second holding position, for example by a force such as Magnetic force is held against the bias to the first position. The preload is overcome by the force.
  • the first and / or the second magnet arrangement may in particular comprise magnets, for example permanent magnets.
  • first magnet arrangement and / or the second magnet arrangement can comprise a radial Hallbach array in order to achieve a particularly directed magnetization in a certain area.
  • first and / or the second magnet arrangement may comprise a magnetized band. Such a configuration can be particularly space-saving.
  • the first magnet arrangement can be fixedly mounted and the second magnet arrangement can be mounted on the shaft in the mounted state.
  • the space requirement on the shaft can be low.
  • the second magnet arrangement may be fixedly mounted and the first magnet arrangement mounted in the mounted state on the shaft.
  • the space requirement on the stationary element, on which the second magnet arrangement can be smaller.
  • a first embodiment of a device 1 for generating a voltage pulse upon rotation of a rotatably mounted about a rotation axis R shaft 2 is shown.
  • a second magnet assembly 12 is mounted, which may be formed, for example, as a permanent magnet.
  • the second magnet arrangement 12 has a north pole N and a south pole S, the north-south direction 100, 102 of the second magnet arrangement 12 extending from the north pole N to the south pole S running transversely to the axis of rotation R.
  • the north-south direction 102 extends in particular perpendicular to the axis of rotation R, which runs parallel to a longitudinal direction L.
  • the north-south direction 102 runs along a transverse direction Q which is perpendicular to the longitudinal direction L and to the axis of rotation R.
  • the transverse direction Q represents a radial direction with respect to the shaft 2 and the rotation axis R, whereas the longitudinal direction L is an axial direction of the shaft 2.
  • the device 1 further comprises a first magnet arrangement 11, which is held bistable and has a first stable holding position 21 and a second, from the first holding position 21 along the rotation axis R spaced, stable holding position 22, which is shown in dashed lines.
  • the first magnetic device 11 is fastened to a printed circuit board 50 via a holding device 70.
  • the holding device 70 may, for example, according to one of Fig. 2 . 3 or 4 be designed.
  • the first magnet arrangement 11 can have a groove 85 into which the holding device 70 can engage.
  • the holding device 70 holds the first magnet assembly 11 stably in the first holding position 21 and in the second holding position 22.
  • the holding device 70 is designed as a bistable element, so that the first magnet arrangement 11 jumps from the first holding position 21 into the second holding position 22. The transition between the two holding positions 21 and 22 is abrupt.
  • the first magnet assembly 11 is configured as a permanent magnet and has a north pole N and a south pole S.
  • the north-south direction 100, 101 of the first magnet arrangement 11 extends transversely to the axis of rotation R and transversely to the longitudinal direction L.
  • the north-south direction 100, 101 again runs along a transverse direction Q, which is perpendicular to Longitudinal direction L and to the rotation axis R.
  • the north-south direction 101 of the first magnet arrangement 11 is oriented opposite to the north-south direction 102 of the second magnet arrangement 12.
  • the north pole N of the first magnet assembly 11 is on the left, whereas the north pole N of the second magnet assembly 12 is on the right.
  • the north pole N of the second magnet arrangement 12 is aligned with the south pole S of the first magnet arrangement 11 along the longitudinal direction L.
  • the south pole S of the second magnet arrangement 12 is aligned in the longitudinal direction L with respect to the north pole N of the first magnet arrangement 11.
  • the first magnet arrangement 11 is rotatable about the rotation axis R relative to the second magnet arrangement 12.
  • the second magnet arrangement 12 rotates with the shaft 2.
  • the first magnet arrangement 11 and a holding device 70 may also rotate with the shaft 2 and the second magnet arrangement may be fixedly attached to a housing or an external element.
  • the north poles N and south poles S of the magnet arrangements 11, 12 also move relative to each other. Is the shaft 2 180 degrees to the in Fig. 1 rotated position shown, so are the two north poles N and the two south poles S of the first magnet assembly 11 and the second magnet assembly 12 in alignment. Due to the resulting repulsive magnetic force, the first magnet assembly 11 has then moved to the second holding position 22, which is shown with dashed lines. The transition is very fast due to the bistable element forming the retainer 70.
  • the device 1 furthermore has a voltage generating device 3, which in particular comprises two coils 40, 41, 42.
  • the coils 40, 41, 42 are each rotationally symmetrical about the longitudinal axis L and the axis of rotation R of the shaft second
  • the first magnet arrangement 11 As a result of the movement of the first magnet arrangement 11, which runs along the axis of rotation R of the longitudinal direction L, a voltage is induced in the coils 40, 41, 42, so that a voltage pulse is produced in the voltage generator 3.
  • the first magnet arrangement 11 In the second holding position 22, the first magnet arrangement 11 has a different distance 44 to each of the coils 41, 42.
  • the first magnet arrangement 11 in at least one of the holding positions 21 and 22 is at least partially within a volume which is spanned by the coils 41, 42.
  • the coils 40, 41, 42 are arranged on an upper side 51 and a lower side 52 of the printed circuit board 50, resulting in a compact design.
  • a voltage generating device 3 could generate a voltage pulse, for example also by deforming a piezoelectric element or by changing a position of a plate of a capacitor.
  • the two north-south directions 100, 101, 102 transverse to the axis of rotation R.
  • the axis of rotation R passes through the first magnet assembly 11 and the second magnet assembly 12.
  • the moment of inertia of the magnet assemblies 11 and 12 is thereby low, which in particular in the rotation of the shaft 2 is advantageous because it can then be moved easily, as an embodiment in which the second magnet assembly 12 is disposed away from the axis of rotation R.
  • Retaining elements 76 of the holding device 70 are disposed laterally adjacent to the first magnet assembly 11 with respect to the rotation axis R, so that the apparatus 1 is compact in the longitudinal direction L.
  • the first magnet arrangement 11 is held mechanically stable by the holding device 70 in the two holding positions 21, 20.
  • the first magnet assembly 11 could be held in at least one of the two holding positions 21, 22 also due to magnetic forces or other external forces.
  • the holding device 70 could be designed so that in at least one of the two holding positions 21, 22 a bias to the other holding position 22, 21 is present, which is overcome by the magnetic force or the external force.
  • a first embodiment of a holding device 70 is shown.
  • the holding device 70 comprises, in particular, two holding elements 76 configured as strips or flat bars, which are located on opposite sides of a permanent magnet forming the first magnet arrangement 11.
  • the support members 76 may be attached to the free ends on external elements such as a circuit board 50.
  • the first magnet arrangement 11 is held and clamped between the two holding elements 76.
  • the holding elements 76 are elastic and allow an elastic deflection along the longitudinal direction L and the axis of rotation R.
  • a second embodiment of a holding device 70 is shown.
  • four designed as a flat bar holding elements 76 are provided, which are each 90 degrees offset from each other to the first magnet assembly 11 are mounted.
  • Such a configuration may for example be warp-resistant than the embodiment in FIG Fig. 2 ,
  • the first magnet assembly 11 is mounted in the center of a circular retainer 70.
  • the holding device 70 is a membrane-shaped Holding device, ie it is very flat and essentially two-dimensional. As a result, a compact design is possible.
  • the retainer 70 may be attached to an external element that may be stationary. An attachment may in particular be present along the entire circumference 75, so that a secure attachment is possible.
  • the holding device 70 may be inserted into a groove of an external element.
  • the first magnet arrangement is a separate element which is inserted into an opening of the holding device 70.
  • a part of the holding device 70 may also be designed as a first magnet arrangement 11 or as a second magnet arrangement 12.
  • a part of the holding device 70 may be magnetized and thus act as a magnet arrangement 11, 12.
  • the first magnet arrangement 11 is located between two coils 41, 42 and is supported by a holding element 70 according to the Fig. 4 held. Upon rotation of the shaft 2 and thus the second magnet assembly 12, the first magnet assembly 11 is again attracted and repelled along the axis of rotation R and thereby generates current and voltage pulses in the coils 41, 42nd
  • At least one of the magnet arrangements 11, 12 can be configured as a radial Hallbach array or as a magnetized band.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)
EP17196643.5A 2017-10-16 2017-10-16 Dispositif de génération d'impulsion de tension lors d'une rotation d'un arbre monté de manière rotative autour de l'axe de rotation Active EP3471115B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP17196643.5A EP3471115B1 (fr) 2017-10-16 2017-10-16 Dispositif de génération d'impulsion de tension lors d'une rotation d'un arbre monté de manière rotative autour de l'axe de rotation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17196643.5A EP3471115B1 (fr) 2017-10-16 2017-10-16 Dispositif de génération d'impulsion de tension lors d'une rotation d'un arbre monté de manière rotative autour de l'axe de rotation

Publications (2)

Publication Number Publication Date
EP3471115A1 true EP3471115A1 (fr) 2019-04-17
EP3471115B1 EP3471115B1 (fr) 2020-05-13

Family

ID=60201818

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17196643.5A Active EP3471115B1 (fr) 2017-10-16 2017-10-16 Dispositif de génération d'impulsion de tension lors d'une rotation d'un arbre monté de manière rotative autour de l'axe de rotation

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2539548A1 (de) * 1974-09-20 1976-07-29 Ford Werke Ag Magnetisch betaetigbarer elektrischer signalgeber
US4829248A (en) * 1984-09-20 1989-05-09 Loubier Robert J Hall effect sensing apparatus and method
DE4224129A1 (de) * 1992-07-22 1994-01-27 Duerrwaechter E Dr Doduco Induktiver Drehimpulsgeber
EP0658745A2 (fr) * 1993-12-02 1995-06-21 Walter Dr. Mehnert Capteur de position

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2539548A1 (de) * 1974-09-20 1976-07-29 Ford Werke Ag Magnetisch betaetigbarer elektrischer signalgeber
US4829248A (en) * 1984-09-20 1989-05-09 Loubier Robert J Hall effect sensing apparatus and method
DE4224129A1 (de) * 1992-07-22 1994-01-27 Duerrwaechter E Dr Doduco Induktiver Drehimpulsgeber
EP0658745A2 (fr) * 1993-12-02 1995-06-21 Walter Dr. Mehnert Capteur de position

Also Published As

Publication number Publication date
EP3471115B1 (fr) 2020-05-13

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