EP3021428A1 - Schleifring mit erhöhter Kriechstrecke - Google Patents

Schleifring mit erhöhter Kriechstrecke Download PDF

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Publication number
EP3021428A1
EP3021428A1 EP14192687.3A EP14192687A EP3021428A1 EP 3021428 A1 EP3021428 A1 EP 3021428A1 EP 14192687 A EP14192687 A EP 14192687A EP 3021428 A1 EP3021428 A1 EP 3021428A1
Authority
EP
European Patent Office
Prior art keywords
slip ring
ring module
sliding
contact
sliding tracks
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.)
Withdrawn
Application number
EP14192687.3A
Other languages
English (en)
French (fr)
Inventor
Christian Holzapfel
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 und Apparatebau GmbH
Original Assignee
Schleifring und Apparatebau 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 und Apparatebau GmbH filed Critical Schleifring und Apparatebau GmbH
Priority to EP14192687.3A priority Critical patent/EP3021428A1/de
Publication of EP3021428A1 publication Critical patent/EP3021428A1/de
Withdrawn legal-status Critical Current

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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

Definitions

  • the invention relates to slip rings and part thereof. It specifically relates to slip ring modules having an increased insulation and an increased creepage distance.
  • Slip rings are used for transferring electrical signals or power between parts rotating relative to each other.
  • Slip rings generally have circular tracks of an electrically conductive material at a first part and brushes of a further electrically conductive material at a second part where the brushes are sliding at the conductive tracks.
  • a slip ring is disclosed in US 6,283,638 B1 .
  • the slip ring comprises a cylindrical slip ring module having cylindrical sliding tracks of a conductive material and brush blocks further comprising brushes for sliding on the sliding tracks.
  • the brush blocks and therefore the brushes are rotatable against the module.
  • the embodiment disclosed in this document specifically has wire brushes comprising a comparatively thin metal wire.
  • the sliding tracks of the module comprise V-shaped grooves to guide the wire at a predetermined position.
  • the creepage distance between neighbored sliding tracks determines the electrical isolation and is mainly given by the distance between neighbored tracks. Therefore, the length of a slip ring module increases with increasing isolation requirements as the creepage distance has to be increased.
  • the problem to be solved by the invention is to provide a slip ring module having increased creepage distance between neighboring sliding tracks while providing a high mechanical stability and stiffness of the slip ring module. Furthermore, the manufacturing process should be simple and inexpensive.
  • the slip ring module should have a long life time and preferably a high current-carrying capacity.
  • the slip ring module of a first embodiment comprises a body of an isolating material holding at least one sliding track.
  • the at least one sliding track has a support portion which is held by the body, further supporting a contact portion.
  • the support portion is adjacent to an inner surface of a contact portion which is further opposed to a contact surface.
  • the support portion is distant from the contact portion. Most preferably, only the support portion is in contact with the body, whereas the contact portion has no contact with the body. It is preferred, if there is a gap of more than 0.1 mm, most preferably 1 mm between the inner surface and the body.
  • the sliding track has a T-shaped cross-section.
  • any other shape like an L- or a Z-shape may also be suitable.
  • the support portions extend from the body, there is a creepage distance defined by the distance along the surface of the body between neighboring support portions of neighboring sliding tracks.
  • the contact portions of the sliding tracks are wider than the support portions, resulting in a smaller distance between neighboring contact portions of neighboring sliding tracks. This results in a lower pitch of the sliding tracks, which means the distance between neighboring sliding tracks is smaller and the slip ring modules can be built more compact.
  • the air gap between neighboring conductors may be smaller than the creepage distance, as material surfaces like the surface of the body are more critical.
  • the creepage distance is 1.3- and 3-times the size of the air gap. Most preferably, the creepage distance is between 1.5- and 2.5-times the size of the air gap.
  • the width of the contact surface of a sliding track is determined by current-carrying characteristics of the contact surface. If a certain number of wires or a certain size of carbon brushes is running on a sliding track, a certain width is required. Furthermore, the width of the sliding track is often determined by the current-carrying capacity through the sliding track itself. This is specifically critical with large diameter slip rings having a significant length of the sliding tracks. Here, a long sliding track has a significant resistance causing voltage drop and dissipation of power.
  • the support portion which preferably is of the same material as the contact portion, and which preferably is of the same piece as the contact portion, the current-carrying capacity can be significantly increased and the resistance and therefore also the power dissipation can be decreased.
  • slip ring modules and sliding tracks according to this embodiment are suitable to higher current-carrying capacity than the slip ring modules known from prior art.
  • a further benefit is that besides a generally lower heat dissipation due to the lower resistance, there is a better dissipation of the generated heat due to a higher radiation surface which increases radiation and convection. Furthermore, there is a better air flow at the outer side of the contact portion and in addition at the inner surface of the contact portion, which further helps to dissipate heat from the sliding tracks and the slip ring module. Due to an airstream at the inner side of the contact portion, and therefore between the contact portion and the surface of the body, removal of debris from the surface of the body is further improved, which results in a longer lifetime and higher isolation.
  • a slip ring module comprises a plurality of body segments and a plurality of sliding tracks.
  • one sliding track is held by one body segment.
  • the body segments are designed such that they can be stacked together for obtaining slip ring modules with a plurality of sliding tracks.
  • the width of the body segments is such that the required creepage distance between neighboring sliding tracks is predetermined. In an alternate embodiment, there may be plurality of sliding tracks held by a body segment.
  • body segments and sliding tracks may be stacked together. This may result in a sequence of body segments and sliding tracks. It is preferred if a body segment comprises means for holding at least one sliding track. Such means may be a groove.
  • sliding tracks are cast or molded into a body.
  • a means for blowing air or another cooling medium in between the tracks is provided.
  • a means for blowing air or another cooling medium in between the tracks may be a fan or a pump.
  • Another embodiment relates to a slip ring having at least one slip ring module as disclosed herein, and at least one sliding brush which may be held by a brush block.
  • the at least one sliding brush is sliding on at least one of the sliding tracks to allow the transfer of electrical current.
  • a method for manufacturing a slip ring module comprises the step of providing at least one sliding track having a support portion and a contact portion with a contact surface, wherein the width of the support portion is less than the width of the contact portion, casting the at least one sliding track into a slip ring module body.
  • a method for providing a slip ring module may comprise providing at least one body segment having a body of an insulating material and a sliding track, wherein the width of the support portion is less than the width of the contact portion, casting the at least one sliding track into a slip ring module body.
  • Further steps may comprise stacking a plurality of such body segments to a slip ring module.
  • a further method for providing a slip ring module may be stacking a sequence of at least one body segment, a sliding track, and another body segment, which may be followed by further sliding tracks and body segments.
  • a slip ring module 10 with sliding tracks 12 is held by body segments 11.
  • a plurality of body segments 11 are stacked together to form a slip ring module body. These body segments hold a plurality of sliding tracks 12.
  • Each sliding track is a ring-shaped member preferably having a T-shaped cross-section.
  • Each sliding track comprises a support portion 15 which is held by the body segments 11, and a contact portion 13, further having a contact surface 14 for contacting a sliding brush. It is preferred, if the support portion is of the same material as and most preferably one piece with the contact portion. Opposing to the contact surface 14 and adjacent to the support portion 15 there is an inner surface 16 of the contact portion 13, which has a distance of at least 0.1 mm to the body segments 11.
  • the creepage distance 40 is larger than the air gap 41.
  • the creepage distance 40 is 1.3- and 3-times the size of the air gap.
  • the creepage distance is between 1.5- and 2.5-times the size of the air gap.
  • the slip ring module may rotate around a rotation axis, which preferably is also the center axis 19 of the slip ring module.
  • at least the contact surface of the sliding tracks is rotationally symmetrical to the center axis 19. It is further preferred, if the body and most preferably the whole slip ring module is at least approximately rotationally symmetrical to the center axis 19.
  • FIG. 2 a front view of the first embodiment is shown.
  • the sliding tracks are rotationally symmetrical around a center axis 19.
  • Figure 3 shows a further embodiment of a slip ring module 20, where the sliding tracks 12 are cast into a body 21.
  • the body 21 comprises an isolating material like a plastic material, which most preferably is stiff enough to hold the sliding tracks in place.
  • the sliding tracks may extend through the body 21 into a hollow inner space, where they may be contacted by cables or wires.
  • FIG. 4 a front view of the second embodiment is shown. Here, it is shown, that the sliding tracks are rotationally symmetrical around a center axis 19.
  • Figure 6 shows another embodiment with further increased creepage distance is shown.
  • grooves 23 are provided in the surface of the body, further increasing the creepage distance.
  • the slip ring module 10 comprises a plurality of sliding tracks as disclosed herein.
  • the sliding tracks may be contacted by a plurality of module wires or module cables 18, which preferably are soldered, welded or screwed to the support portions of the sliding tracks. Due to the support portions being distant from the contact surface of the sliding tracks, soldering or welding can easily be done without damaging the sensitive contact surface of the sliding tracks.
  • a brush block 30 is disclosed having a plurality of brushes 31. Each of the brushes is in contact with one sliding track of the module.
  • the brushes 31 may be held by a printed circuit board 36 which further may comprise conductor tracks for connecting the brushes to a brush block cable connector 37 which is further connected to a brush block cable 38.

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  • Motor Or Generator Current Collectors (AREA)
EP14192687.3A 2014-11-11 2014-11-11 Schleifring mit erhöhter Kriechstrecke Withdrawn EP3021428A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14192687.3A EP3021428A1 (de) 2014-11-11 2014-11-11 Schleifring mit erhöhter Kriechstrecke

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14192687.3A EP3021428A1 (de) 2014-11-11 2014-11-11 Schleifring mit erhöhter Kriechstrecke

Publications (1)

Publication Number Publication Date
EP3021428A1 true EP3021428A1 (de) 2016-05-18

Family

ID=51893891

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14192687.3A Withdrawn EP3021428A1 (de) 2014-11-11 2014-11-11 Schleifring mit erhöhter Kriechstrecke

Country Status (1)

Country Link
EP (1) EP3021428A1 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR401241A (fr) * 1909-03-25 1909-08-21 Jacquet Freres Soc Dispositif de bagues collectrices pour rotors de moteurs à courants alternatifs et pour alternateurs et moteurs asynchrones
GB154878A (en) * 1919-12-02 1921-04-07 Loecknitzer Eisenwerk Ges Mit Improvements in or relating to dynamo-electric machines
US1378049A (en) * 1917-10-24 1921-05-17 Westinghouse Electric & Mfg Co Current-collecting device
US1756004A (en) * 1929-04-22 1930-04-22 Allis Louis Co Current collector
US5734218A (en) 1996-05-13 1998-03-31 Litton Systems, Inc. Electrical slip ring and method of manufacturing same
US6283638B1 (en) 1998-07-31 2001-09-04 Litton Systems, Inc. Slip ring with integral bearing assembly and method of manufacture

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR401241A (fr) * 1909-03-25 1909-08-21 Jacquet Freres Soc Dispositif de bagues collectrices pour rotors de moteurs à courants alternatifs et pour alternateurs et moteurs asynchrones
US1378049A (en) * 1917-10-24 1921-05-17 Westinghouse Electric & Mfg Co Current-collecting device
GB154878A (en) * 1919-12-02 1921-04-07 Loecknitzer Eisenwerk Ges Mit Improvements in or relating to dynamo-electric machines
US1756004A (en) * 1929-04-22 1930-04-22 Allis Louis Co Current collector
US5734218A (en) 1996-05-13 1998-03-31 Litton Systems, Inc. Electrical slip ring and method of manufacturing same
US6283638B1 (en) 1998-07-31 2001-09-04 Litton Systems, Inc. Slip ring with integral bearing assembly and method of manufacture

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