EP3217487B1 - Modulares schleifring system - Google Patents

Modulares schleifring system Download PDF

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Publication number
EP3217487B1
EP3217487B1 EP16159221.7A EP16159221A EP3217487B1 EP 3217487 B1 EP3217487 B1 EP 3217487B1 EP 16159221 A EP16159221 A EP 16159221A EP 3217487 B1 EP3217487 B1 EP 3217487B1
Authority
EP
European Patent Office
Prior art keywords
slipring
sliding tracks
sliding
section
sections
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.)
Active
Application number
EP16159221.7A
Other languages
English (en)
French (fr)
Other versions
EP3217487A1 (de
Inventor
Jan Häcker
Horst Knobl
Bernd Knötel
Stefan Küntzer
Christian Schwarzmann
André Tiefenbach
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.)
Schleifring GmbH
Original Assignee
Schleifring 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 Schleifring GmbH filed Critical Schleifring GmbH
Priority to EP16159221.7A priority Critical patent/EP3217487B1/de
Publication of EP3217487A1 publication Critical patent/EP3217487A1/de
Application granted granted Critical
Publication of EP3217487B1 publication Critical patent/EP3217487B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/02—Details for dynamo electric machines
    • H01R39/08—Slip-rings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/10—Manufacture of slip-rings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/02—Details for dynamo electric machines
    • H01R39/08—Slip-rings
    • H01R39/10—Slip-rings other than with external cylindrical contact surface, e.g. flat slip-rings

Definitions

  • the invention relates to sliprings having at least one sliding track of an electrically conductive material held by a body comprising insulating material. It further relates to large sliprings which may be used for computed tomography (CT) scanners.
  • CT computed tomography
  • CT computed tomography
  • US 5,054,189 discloses a slipring having a body of insulating material with pre-machined grooves into which a conductive sliding track is rolled.
  • US 5,734,218 discloses a drum-shaped slipring having a pre-formed insulating body with grooves into which sliding tracks are pressed.
  • the body needs a rigid backing member as mechanical support.
  • US 6,664,697 B2 discloses a slipring apparatus having multiple spaced-apart support structures.
  • the support structures are made of an insulating material to provide the insulation and spacing from a supporting CT scanner gantry.
  • As multiple spaced-apart support structures are used only a comparatively small amount of insulating material is required, which makes the support structure comparatively inexpensive.
  • the drawback is, that the sliding tracks are only mechanically supported at the location of the spaced-apart support structures. Between the support structures, there is no mechanical support. Therefore, the sliding tracks themselves must have a certain mechanical stability which further requires a significant amount of sliding track material, which compensates or even over-compensates the savings by the support structure.
  • US 3,976,903 A discloses a slip ring, according to the preamble of claim 1, for an AC motor having a base comprising two half sections. These half sections are enclosed by sliding tracks and are pressed against the sliding tracks by internal springs.
  • WO 2012/136646 discloses a segmented disk bearing sliding tracks.
  • JP H08279389 A discloses a method for manufacturing sliprings with a segmented base.
  • JP 3476255 B2 discloses a method for manufacturing of sliprings with pre manufactured segments forming a base.
  • the problem to be solved by the invention is to provide a slipring which has a simplified manufacturing process and lower manufacturing costs while avoiding the disadvantages mentioned above.
  • the insulating body is simplified.
  • the embodiment is based on the fact that a one-piece insulating body is large, heavy, difficult to handle and requires large molding machines. Therefore, the insulating body is divided into a plurality of body sections, preferably having the shape of arc segments.
  • Preferred numbers of body sections are three, four, five, six, seven, eight, twelve or fifteen. Since any number of body segments may be used, the number of segments would be optimized to have as few segments as necessary but profit from lower manufacturing tolerances for smaller segments produced on machines suitable for mass production. Preferably the number of body segments would be between 3 and 15.
  • Each individual body section is significantly smaller than the whole insulating body and therefore may be manufactured by using significantly smaller manufacturing and specifically molding and milling machines.
  • first individual body sections are manufactured.
  • grooves for holding sliding tracks are provided in the body section.
  • holes or other means which may be required for contacting sliding tracks or mounting the assembled body are provided in at least one of the body sections. It is not necessary, that each body section has holes for contacting a sliding track, as a sliding track may be contacting only once or twice. The same applies to mounting means.
  • the body sections have mounting holes, mounting surfaces, and interconnecting means for interconnecting neighbored body sections. They may further have mounting holes for other components like transceivers and antennas of contactless data links. Therefore, preferably the body sections are prepared such that after assembling the body sections to an insulating body bearing sliding tracks, no or only a low number of processing steps is required to finish the slipring. Also an encoder tick fence formed as a ring can be assembled in a groove of the assembled slipring. Instead of further sliprings ferrites for an inductive contactless power transmission can be mounted into a groove of the segments. After mounting of the segments together with a slipring track for grounding purposes litz wire may be potted into the ferrites.
  • a plurality of body sections is assembled to form a continuous ring-shaped body.
  • the sections may be mechanically connected to each other by interconnecting a first end side of a section to a second end side of a neighbored section, by at least one of the connection methods as mentioned below:
  • a key-and-slot-connection may be used, wherein at least one body section has at least one key and/or at least one slot at a first end side, while at least one second section has at least one corresponding key or slot at a second end side.
  • Key-and-slot-connections may be designed such that the end sides of neighbored sections can be slid in a either axial, radial or tangential direction together.
  • Neighboring sections may also be bolted together by bolts and/or screws, which are preferably arranged in tangential direction.
  • the bolts and/or screws may engage with threads which may be integrated into the sections, or with nuts at the sections.
  • the bolts and/or screws are arranged in a tangential direction, although it is also possible to use overlapping attachment sections of the body sections which may be screwed together by screws and/or bolted by bolts in any other direction, like radial or axial direction.
  • the body sections may also be glued together by using an adhesive, like epoxy or any other adhesive material. Also self-adhesive tapes may be used. They may also be plastics welded.
  • a key-and-slot-connection may be used for a first assembly stage, whereas the body sections are locked together by bolts, while an adhesive cures to give the body the final stability and strength.
  • At least two sliding tracks are mounted to the ring-shaped body, preferably after the body sections have been assembled to a ring-shaped body.
  • the at least two sliding tracks stabilize the ring shaped body. Therefore it is preferred, if a larger number of sliding tracks is provided.
  • the at least two sliding tracks are mounted into a groove in the ring-shaped body, or at least close to a protrusion which may act as a barrier. It is further preferred, if the at least two sliding tracks are mechanically fixed to the ring-shaped body. It is preferred, if the sliding tracks are fixed by an adhesive, for example by gluing with epoxy or any other suitable material.
  • the at least two sliding tracks are glued to the ring-shaped body over its whole length, which would result in the highest possible stability and strength.
  • the at least two sliding tracks may be glued at multiple locations, whereby it is preferred to keep the distance between the gluing locations small.
  • the sliding track may be fixed by means of bolts which are attached to the sliding track. Such a fixation by bolts is preferably done at multiple positions of the sliding track to give a good stability.
  • the bolts may also serve as terminals to contact the slipring track.
  • drum shaped sliprings can be manufactured easily. Normally, it is not possible to insert ring shaped sliding tracks into grooves of a drum (or cylinder) shaped body. Here, other, comparatively complex methods must be used.
  • individual body sections can either be placed from the outside (if the rings are inside the body) or from the inside (if the rings are outside of the body) at the sliding tracks.
  • split sliding tracks which may be formed from bar stock can be extended in their diameter, such that they can be moved over the body to their final position.
  • the sliding tracks are providing a significant function in the mechanical support of the body sections, and therefore, the sliding tracks should have a certain cross-section and mechanical stability. It is preferred, that at least one sliding track has a cross-section in a range of between 5 mm 2 and 100 mm 2 , most preferably between 20 mm 2 and 60 mm 2 . It is further preferred to have at least three, most preferably five sliding tracks. A higher number of tracks increases stability. It is further preferred to use brass or similar rigid material for the at least one sliding track. Brass has a sufficient stiffness and a sufficiently low resistance to allow the transport of high currents which may be up to several hundred Ampere per track in modern CT scanners. Also different sliding tracks may be made from different materials.
  • An embodiment relates to a cheaper method and slipring by using a standard rod-shaped material, like bar stock, and forming ring-shaped sliding tracks thereof.
  • the tracks are bent to the sliding track diameter.
  • Forming or bending the sliding tracks may be done by rolling.
  • Such pre-formed circular sliding tracks may be fixed or glued to the body sections in a later step. It is not desired to roll the sliding track material on or into the body sections similar to the rolling of wires into a solid slipring body, as disclosed in US 5,054,189 . Such a direct rolling would assert significant forces to the body sections which may lead to damage thereof.
  • the ends of a sliding track made of bar stock may be welded, soldered or molded together to form a continuous ring. It is preferred to omit this manufacturing step and to glue the sliding track having a gap into the ring-shaped body or the body sections.
  • Such sliding tracks can also easily be mounted to a cylindrical body, even without using a sectioned body. It is desired to have both ends of a sliding track made of bar stock at the same height, to avoid an edge. However, due to manufacturing tolerances, an edge can hardly be avoided. Such an edge may be removed by further machining, which is not desirable. Tests have shown that a certain gap is acceptable and would even allow a certain deviation in height of the both ends without leading to increased brush wear.
  • the gap between the ends of the sliding track which preferably is between 0.5 and 3 mm, most preferably between 1.5 and 2.5 mm, and further preferred at about 2 mm. It is further preferred, if the gap is under an angle to the tangent of the sliding track, which may be in a range between 10 degrees to 90 degrees. It is preferred, if the angle is between 40 and 80 degrees, and most preferred around 60 degrees.
  • the section of the sliding track forming an acute angle is chamfered or preferably rounded at the location of the acute angle.
  • a slipring having multiple gaps it is preferred to displace the gaps with respect to each other, such that the brushes are moving over the gaps at different times. This would avoid a sudden bump or shock, which may lead to a short contact interrupt or at least some vibration or noise.
  • there at least two sliding tracks with displaced gaps connected together two or more narrower sliding tracks may be used connected parallel instead of a wide sliding track, as multiple narrow sliding tracks are easier to manufacture e.g. easier to bend. It is further preferred, if the sliding tracks are close to each other, such that one brush may run on the multiple sliding tracks contacting the plurality of sliding tracks.
  • the sliding tracks disclosed herein may either be used with any standard isolating body or with any sectioned body disclosed herein.
  • a further embodiment relates to a CT scanner having at least one of the embodiments disclosed above.
  • FIG. 1 a top view of a slipring with a sectioned body according to a first embodiment is shown.
  • the slipring 100 has a center of rotation 101, around which it may rotate.
  • the slipring has a body 110 comprising a plurality of sections 111, 112, 113, 114, 115, and 116. In this embodiment, six sections of the same size are shown. Therefore, every section covers an angle of about 60 degrees. It is obvious, that a slipring body may comprise any other number of sections, even in different sizes, as long as the sections form a body.
  • the slipring body 110 holds a plurality of sliding tracks 121, 122, 123, and 124 of an electrically conductive material.
  • sliding tracks there may be any number of sliding tracks, starting from one sliding track to a large number of sliding tracks.
  • CT computed tomography
  • multiple sliding tracks are required for transmission of various power levels and multiple control signals.
  • the sliding tracks may have different sizes, like different heights and different widths or even different shapes, like batch-shaped or circular.
  • the sliding tracks may be mounted at different distances from each other, whereby preferably the distances are dimensioned according to the isolation requirements and specifically according to the required creeping distances which largely depend on the operational voltage difference between neighbored sliding tracks.
  • there is a number of mounting holes 130 which may be used to mount the body to a supporting structure.
  • each section has at least one mounting hole, which would result in a better stability. It is further preferred to have a higher number, like two or more mounting holes per section.
  • FIG. 2 a sectional view from one side of the slipring is shown.
  • the sliding tracks 121, 122, 123, and 124 can be seen protruding from the slipring body 110.
  • This view is a partial sectional view, where the slipring body 110 is shown from a side view and the sliding tracks from a sectional view.
  • FIG. 3 a simplified sectional view is shown.
  • the body 110 bears the sliding tracks 121, 122, 123, and 124 in corresponding grooves.
  • FIG 4 a rear side view of a first embodiment is shown.
  • the body sections are held together by bolts.
  • This Figure shows a first section joint 310 and a second section joint 320 which are slightly different and are explained later in detail. Preferably, there is such a section joint between each two neighbored sections.
  • FIG. 5 a detailed view of a first section joint 310 is shown.
  • a first cutout 311 in a first section which may be section 111 in this Figure.
  • a second cutout 312 in an adjacent or neighboring body section, which may be section 112 in this example.
  • a bolt 315 which preferably has a thread and which is locked by a nut 316.
  • the bolt connects the first holder and the second holder and may be tightened by rotating the nut 316 such that the first holder and the second holder are pulled together, locking the body sections together. Tightening the nut applies a tensile force between the two neighboring body sections.
  • a second section joint 320 with a locking plate is shown.
  • This section joint 320 is an improvement of the previous section joint 310.
  • a locking plate 321 has been added, which is preferably held by a plurality of bolts 322.
  • two bolts are provided in each of the body sections which have to be held together.
  • holes 323 are provided in the body sections, as shown in Figure 5 .
  • the plate has non- (V shape) parallel slots, by pushing the plate towards the rotating axis a compressive force is applied. By turning the bolt the plate is fixed.
  • a first embodiment 210 of a body section as a molded section is shown.
  • This body section preferably comprises a plurality of grooves 261, 262, 263, and 264 for holding sliding tracks.
  • the section has a first gluing surface 211 and a second gluing surface 212 which may have further grooves 213.
  • the gluing surfaces 211 and 212 of adjacent sections overlap each other and are held together by a glue or an adhesive.
  • the grooves 213 may be provided as overflow cavities into which excess adhesive may flow.
  • a second embodiment of a body section is shown, which for example may be machined from a plastic material.
  • This body section basically has the same features as the previous body section, although it is made of a somewhat thicker material.
  • FIG 9 a further embodiment of a boltable section is shown. This is a section similar to the sections forming a whole body in Figures 4 , 5, and 6 .
  • Each boltable section 230 has a first interface section 231 and a second interface section 232, whereby a first interface section of a first body section is bolted to a second interface section of a second body section.
  • first body section is bolted to a second interface section of a second body section.
  • FIG 10 a section of a body with sliding tracks is shown.
  • the sliding tracks 121, 122, 123, and 124 are mounted, for example by gluing into grooves of body sections 111 and 112. It is obvious that these exemplary body sections may be any other body sections.
  • the sliding tracks preferably cover a gap 117 between neighboring body sections, and therefore further stabilize the body formed of body sections.
  • the sliding tracks may have gaps 281, 282, 283, and 284, which preferably are under an angle to the center of the sliding tracks. It is preferred, if the gaps in the sliding tracks are distant from the gaps 117 between neighboring sections.
  • the gaps may have a distance or gap width 285, which are under an angle 286 to the center of the sliding track 288. It is preferred if the angle of the gap is in a range between 10° to 90°, most preferably between 40° and 80°. The best results have been achieved with a 60° angle. This angle is defined between the gap and the tangent to the sliding track or the center of the sliding track, which usually is parallel to the tangent of the sliding track.
  • the gap preferably has a width in a range between 0.5 and 3 mm, more preferably between 1.5 and 2.5 mm, and most preferably at about 2 mm.
  • the gaps preferably have chamfered or rounded edges 287.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Apparatus For Radiation Diagnosis (AREA)

Claims (12)

  1. Schleifring (100) umfassend einen Isolierkörper (110) und mindestens zwei Schleifbahnen (121-124),
    wobei der Isolierkörper eine Vielzahl von Körperabschnitten (111-116) umfasst, wobei die Körperabschnitte einen durchgehenden ringförmigen Körper bilden, wobei die Körperabschnitte durch mindestens zwei Schleifbahnen verbunden und/oder zusammengehalten werden,
    dadurch gekennzeichnet, dass
    jede Schleifbahn eine Lücke (117) hat, und
    die beiden Lücken zueinander versetzt sind und die mindestens zwei Schleifbahnen mit versetzten Lücken elektrisch miteinander verbunden sind.
  2. Schleifring nach Anspruch 1,
    dadurch gekennzeichnet, dass
    die Lücke (117) unter einem Winkel (286) zwischen 10 Grad und 90 Grad zur Tangente der Schleifbahn liegt.
  3. Schleifring nach Anspruch 2,
    dadurch gekennzeichnet, dass
    der Abschnitt der Schleifbahn, der einen spitzen Winkel bildet, an dem spitzen Winkel abgerundet oder abgeschrägt ist.
  4. Schleifring nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass
    jede der mindestens zwei Schleifbahnen an jeden der Körperabschnitte angeklebt ist.
  5. Schleifring nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass
    jede der mindestens zwei Schleifbahnen mit mindestens einem der Körperabschnitte verschraubt ist.
  6. Schleifring nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass
    jede der mindestens zwei Schleifbahnen in einer Nut in den Körperabschnitten gehalten wird.
  7. Schleifring nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass
    mindestens ein Körperabschnitt durch eine erste Stirnseite an eine zweite Stirnseite eines benachbarten zweiten Körperabschnittes verbunden ist.
  8. Schleifring nach Anspruch 7,
    dadurch gekennzeichnet, dass
    die erste Stirnseite und die zweite Stirnseite eine Nut-und-Feder-Verbindung aufweisen.
  9. Schleifring nach Anspruch 7,
    dadurch gekennzeichnet, dass
    die erste Stirnseite und die zweite Stirnseite durch mindestens einen Bolzen verbunden sind.
  10. Schleifring nach Anspruch 7,
    dadurch gekennzeichnet, dass
    die erste Stirnseite und die zweite Stirnseite miteinander verklebt und/oder kunststoffverschweißt sind.
  11. Schleifring nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass
    jede der mindestens zwei Schleifbahnen aus einem Stangenmaterial ringgeformt ist.
  12. Computertomographie (CT)-Scanner umfassend einen Schleifring nach einem der vorhergehenden Ansprüche.
EP16159221.7A 2016-03-08 2016-03-08 Modulares schleifring system Active EP3217487B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP16159221.7A EP3217487B1 (de) 2016-03-08 2016-03-08 Modulares schleifring system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16159221.7A EP3217487B1 (de) 2016-03-08 2016-03-08 Modulares schleifring system

Publications (2)

Publication Number Publication Date
EP3217487A1 EP3217487A1 (de) 2017-09-13
EP3217487B1 true EP3217487B1 (de) 2019-05-08

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ID=55527319

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16159221.7A Active EP3217487B1 (de) 2016-03-08 2016-03-08 Modulares schleifring system

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201907206D0 (en) * 2019-05-22 2019-07-03 Elekta ltd Slip ring arrangement and connection system employing same
CN115360560B (zh) * 2022-08-03 2023-06-30 浙江恩碧技创新科技有限公司 一种分体式大直径电滑环环体及其制作工艺

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1086653A1 (de) * 1999-09-27 2001-03-28 Marconi Medical Systems, Inc. Schleifring zur Datenübertragung
US20050280329A1 (en) * 2004-06-18 2005-12-22 Day Michael J Electrical contact technology and methodology for the manufacture of large-diameter electrical slip rings

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1416142A (en) * 1972-06-24 1975-12-03 Lucas Electrical Co Ltd Slip ring assemblies
FR2295589A1 (fr) * 1974-12-20 1976-07-16 Sev Marchal Bague a pistes collectrices pour machine electrique tournante et machine correspondante
US5054189A (en) 1990-10-25 1991-10-08 Litton Systetms, Inc. Method of manufacturing an electrical slip ring assembly
JP3476255B2 (ja) * 1994-03-16 2003-12-10 ジーイー横河メディカルシステム株式会社 Ｃｔ装置
JPH08279389A (ja) * 1996-03-13 1996-10-22 Ge Yokogawa Medical Syst Ltd リングアセンブリの製造方法並びにリングアセンブリ及びｘ線断層撮影装置
US5734218A (en) 1996-05-13 1998-03-31 Litton Systems, Inc. Electrical slip ring and method of manufacturing same
US6664697B2 (en) 2001-12-13 2003-12-16 Northrop Grumman Corporation Electrical slip ring apparatus having multiple spaced apart support structures
DE112012001564A5 (de) * 2011-04-04 2014-01-16 GAT Gesellschaft für Antriebstechnik mbH Schleifring zur Übertragung elektrischer Signale
DE102012111381A1 (de) * 2012-11-23 2014-05-28 GAT Gesellschaft für Antriebstechnik mbH Ringelektrode für einen Schleifring, entsprechender Schleifring und Verfahren zur Herstellung einer Ringelektrode

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1086653A1 (de) * 1999-09-27 2001-03-28 Marconi Medical Systems, Inc. Schleifring zur Datenübertragung
US20050280329A1 (en) * 2004-06-18 2005-12-22 Day Michael J Electrical contact technology and methodology for the manufacture of large-diameter electrical slip rings

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