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EP0133802A1 - Un transformateur tournant - Google Patents

Un transformateur tournant Download PDF

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Publication number
EP0133802A1
EP0133802A1 EP84305310A EP84305310A EP0133802A1 EP 0133802 A1 EP0133802 A1 EP 0133802A1 EP 84305310 A EP84305310 A EP 84305310A EP 84305310 A EP84305310 A EP 84305310A EP 0133802 A1 EP0133802 A1 EP 0133802A1
Authority
EP
European Patent Office
Prior art keywords
holes
disc
disc core
core
rotary transformer
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
EP84305310A
Other languages
German (de)
English (en)
Other versions
EP0133802B1 (fr
Inventor
Takakazu Yamazaki
Norio Ishida
Satoshi Saito
Hiroshi Sato
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.)
TDK Corp
Original Assignee
TDK Corp
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
Priority claimed from JP12614783U external-priority patent/JPS6033416U/ja
Priority claimed from JP12932883U external-priority patent/JPS6037212U/ja
Application filed by TDK Corp filed Critical TDK Corp
Publication of EP0133802A1 publication Critical patent/EP0133802A1/fr
Application granted granted Critical
Publication of EP0133802B1 publication Critical patent/EP0133802B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/18—Rotary transformers

Definitions

  • the present invention relates to an improvement in a rotary transformer and, in particular, relates an improvement in the structure of a pair of identical disc cores made of ferro-magnetic material.
  • a rotary transformer is generally used to couple electrically a rotating component and a stationary component in a magnetic storage apparatus such as a video tape recorder (VTR).
  • VTR video tape recorder
  • a conventional multi-channel rotary transformer will be described in more detail subsequently and comprises a pair of identical disc cores which are mounted for relative rotation, each of the disc cores comprising a number of concentric annular grooves provided on the facing surfaces for accommodating coils, each of the annular grooves being concentric with the centre of the disc core and having a first hole for lead wires from the coil.
  • each of the annular grooves of each disc core has a second hole of the same configuration as the first hole, the second hole being positioned diammetrically opposite the first hole, and the first and second holes being symmetrically located with regard to the centre of the disc core so that the disc core is balanced.
  • each annular projection located between two adjacent annular grooves the recess being located adjacent a hole and extending across the entire width of the annular projection.
  • Coils are accommodated in the grooves 16 1 , 16 2 , 16 4 and 16 5 , respectively.
  • An annular short ring (not shown) is embedded in the groove 16 3 in order to separate magnetically coils accommodated in each of the grooves 16 1 , 16 2 from coils in each of the grooves 16 4 , 16 5 .
  • the annular grooves 16 1 , 16 2 , 16 4 and 16 5 have through holes 30 1 , 30 2 , 30 4 and 30 5 , respectively, each of the through holes being in the cylindrical shape and coupling the bottom surface of the groove with the bottom surface of the disc core 14. Lead wires 32 from the coils are extended through the holes 30 to the bottom surface of the disc core 14 on which no grooves are provided, and are connected to an external circuit (not shown).
  • the disc core hereinabove is produced by ferromagnetic material such as ferrite through molding process, sintering process and finish process.
  • the rotor core 14 In operation of the rotary transformer having a pair of the disc cores above-mentioned, the rotor core 14 is rotated, on the other hand the stator core 20 is held stationary. EAch signal in the coils of the rotor core 14 is magnetically transferred to the corresponding coil of the stator core 20, vice versa.
  • the prior rotary transformer has the following disadvantages.
  • the rotary transformer according to the present invention comprises a pair of improved identical disc cores arranged so that relative rotary motion is established as shown in Figure 1, and the present improved disc core is shown in Figure 3, in which identical numerals denote identical elements in Figure 2.
  • the principle feature of the present invention is the presence of second through holes, or dummy through holes 28 for compensating the unbalance of mass of the prior disc core 14 resulting from the resence of the first through holes 30.
  • the second through holes 38 1 , 38 2 , 38 4 and 38 5 are positioned in the annular grooves 16 1 , 16 2 , 16 4 and 16 5 respsectively so that the first through holes 30 and the second through holes 38 are symmetrical with regard to the centre C of the disc core 14.
  • the through holes 30 1 and 38 1 ; 30 2 and 38 2 ; 30 4 and 38 4 ; 30 5 and 38 5 are symmetrical with regard to the centre C of the disc core 50, respectively.
  • Each of the second through holes 38 is the same structure as each of the first through holes 30. Therefore, each of the second through holes 38 is in the cylindrical shape and couples the bottom surface of the grooves 16 with the bottom surface of the disc core 14.
  • the shape of the first through holes 30 and the second through holes 38 is not limited to the cylindrical one, and thus, various shapes can be designed.
  • the disc core 50 of Figure 3 is produced by ferromagnetic material such as ferrite through molding process, sintering process and fiishing process.
  • the second through holes 38 are shaped preferably together with the first through holes 30 by means of a molding process.
  • the rotary transformer according to this embodiment is assembled, similar to Figure 1, using a pair of the present disc cores.
  • a transformer in accordance with the present invention it will be apparent that uniform rotary motion can be established because of the presence of the second through holes 38 for compensating unbalance of mass of the disc resulting from the presence of the first through holes 30.
  • the lead wires to be connected to an external circuit can be extended through either the first through holes 30 or the second through holes 38.
  • greater flexibility in the arrangement of the lead wires is obtained compared with the disc core of Figure 2.
  • Figure 4 shows a further improved disc core 60 utilized in the present rotary transformer, in which the feature of the present disc core is the presence of third through holes 40 and fourth through holes 42.
  • the third and the fourth through holes 40, 42 are arranged in the grooves 16 so that they lie near the line C-C perpendicular to the line B-B near which the first and the second through holes 30, 38 lie. Further, the third through holes 40 and the fourth through holes 42 are positioned so that the third through holes 40 and the fourth through holes 42 are symmetrical with regard to the centre C of the disc core 14.
  • Each of the third and the fourth through holes is the same structure as each of the first and the second through holes 30, 38.
  • the presence of the third and the fourth through holes 40, 42 is to overcome the disadvantage of the disc core of Figure 3.
  • the shape of the molded disc core in the cross section along the line perpendicular to the line B-B of Figure 3 is apt to be deformed in V-shaped structure.
  • the disc core of Figure 4 in which the third through holes 40 and the fourth through holes 42 lie near the line C-C perpendicular to the line B-B, it has been observed that degree of deformation in V-shaped structure decreases.
  • the disc core of Figure 4 is useful when its external diameter is large.
  • the present disc core has an advantage that extending operation of the lead wires can be more facilitated compared with the disc core of Figure 3.
  • Figure 5 (A) is a plan view of a further improved disc core 70 utilized in the present rotary transformer
  • Figure 5(B) is an enlarged perspective view, partly in cross section along the line D-D of Figure 5(A).
  • the feature of the present disc core 70 is the presence of recesses 44 for preventing generation of cracking or breakage which will appear at portions of the annular projections 28 between two adjacent through holes 30 1 and 30 2 ; 30 4 and 30 5 ; 38 1 and 38 2 ; 38 4 and 38 5 .
  • a recess 44 1 at a portion of the annular projection 28 2 between two adjacent through holes 30 1 , 30 2 (in this Figure, the half of the recess 44 1 and the half of each of the holes 30 1 , 30 2 are shown).
  • the recess 44 1 couples both the side walls of the annular projection 28 2 .
  • the bottom surface of the recess 44 1 is generally parallel to the bottom surface of the disc core 70 and the opposite side walls of the recess 44 1 are generally parallel to each other.
  • the edges of the recess 44 1 may be rounded off.
  • the depth D 1 of the recess 44 1 is designed so as to be equal or smaller than the depth D 2 of the annular grooves 16.
  • the width W 1 of the recess 44 1 is designed so as to be nearly equal to the diameter of the through holes 30 1 , 30 2 .
  • another recesses 44 2 , 44 4 and 44 5 are designed in the same manner as the recess 44 1 .
  • the size of those recesses 44 is practically selected depending on the diameter of the through holes 30, the width W 2 of the annular projections 28 and the thickness T 1 of the disc core 14. For example, when the thickness T 1 is in the range from 1.5 to 4.0 mm and the depth D 2 of the grooves 16 is nearly equal to 0.6 mm, and the depth D 1 of the recesses 44 is set to be equal to 0.1 ⁇ 0.2 mm and the width W 1 is set to be nearly equal to the diameter of the through holes 30, 38.
  • the forming of the disc core of Figure 5 is achieved by the molding process in which ferromagnetic material of powder type is pressed by an upper punch comprising projections, corresponding to the recesses 44 and a lower punch including the surface corresponding to the flat bottom surface of the disc core. It has been observed that no cracking or breakage is generated in the disc core when the recesses 44 are included.
  • Figure 6 shows a still further improved disc core 80 utilized in the present rotary transformer.
  • This disc core further comprises recesses 46 in addition to the recesses 44 of the disc core 70 of Figure 5.
  • the recesses 46 are provided at portions of the annular projections adjacent to one of the through holes. That is, the recesses 46 1 , 46 3 are provided at portions of the annular projection 28 1 adjacent to the through holes 30 1 , 38 1 respectively, and the recesses 46 2 , 46 4 are provided at portions of the annular projection 28 6 adjacent to the through holes 30 5 , 38 5 respectively.
  • the recesses 46 prevent generation of cracking or breakage at the projections 28 1 , 28 6 .
  • the disc core of Figure 6 is useful when the width of the annular projections is relatively small.
  • Recesses may be provided in the disc core 60 of Figure 4 in the same manner as in Figure 5 or Figure 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)
EP19840305310 1983-08-16 1984-08-03 Un transformateur tournant Expired EP0133802B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP126147/83 1983-08-16
JP12614783U JPS6033416U (ja) 1983-08-16 1983-08-16 回転トランス
JP129328/83 1983-08-23
JP12932883U JPS6037212U (ja) 1983-08-23 1983-08-23 回転トランス

Publications (2)

Publication Number Publication Date
EP0133802A1 true EP0133802A1 (fr) 1985-03-06
EP0133802B1 EP0133802B1 (fr) 1987-08-19

Family

ID=26462367

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840305310 Expired EP0133802B1 (fr) 1983-08-16 1984-08-03 Un transformateur tournant

Country Status (2)

Country Link
EP (1) EP0133802B1 (fr)
DE (1) DE3465542D1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2173351A (en) * 1986-02-03 1986-10-08 Porsche Ag A ferromagnetic multiple shell
EP0218142A2 (fr) * 1985-10-11 1987-04-15 Institut Dr. Friedrich Förster Prüfgerätebau GmbH & Co. KG Dispositif transmetteur rotatif
US4675638A (en) * 1985-02-01 1987-06-23 Dr. Ing. H.C.F. Porsche Aktiengesellschaft Ferromagnetic multiple shell core for electric coils
EP0388792A1 (fr) * 1989-03-18 1990-09-26 Scherz, Michael Dr.Med. Dr.rer.nat. Dispositif de transmission
CN105553117A (zh) * 2016-03-08 2016-05-04 黄中明 转动装置电磁耦合电力传输器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4293884A (en) * 1979-12-26 1981-10-06 Ampex Corporation Multiple leg magnetic transducer structure
GB2111315A (en) * 1981-12-14 1983-06-29 Himmelstein & Co S Rotary transformer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4293884A (en) * 1979-12-26 1981-10-06 Ampex Corporation Multiple leg magnetic transducer structure
GB2111315A (en) * 1981-12-14 1983-06-29 Himmelstein & Co S Rotary transformer

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, unexamined applications, field E, vol. 6, no. 111, June 22, 1982 THE PATENT OFFICE JAPANESE GOVERNMENT page 72 E 114 & JP-A-57-40 906 (A) (tokyo shibaura) *
PATENT ABSTRACTS OF JAPAN, unexamined applications, field E, vol. 6, no. 173, September 7, 1982 THE PATENT OFFICE JAPANESE GOVERNMENT page 98 E 129 & JP-A-57-90 909 (A) (hitachi) *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4675638A (en) * 1985-02-01 1987-06-23 Dr. Ing. H.C.F. Porsche Aktiengesellschaft Ferromagnetic multiple shell core for electric coils
EP0218142A2 (fr) * 1985-10-11 1987-04-15 Institut Dr. Friedrich Förster Prüfgerätebau GmbH & Co. KG Dispositif transmetteur rotatif
EP0218142A3 (en) * 1985-10-11 1989-04-12 Institut Dr. Friedrich Forster Prufgeratebau Gmbh & Co. Kg Rotary transmitter arrangement
GB2173351A (en) * 1986-02-03 1986-10-08 Porsche Ag A ferromagnetic multiple shell
EP0388792A1 (fr) * 1989-03-18 1990-09-26 Scherz, Michael Dr.Med. Dr.rer.nat. Dispositif de transmission
US5055775A (en) * 1989-03-18 1991-10-08 Michael Scherz Transmission device
CN105553117A (zh) * 2016-03-08 2016-05-04 黄中明 转动装置电磁耦合电力传输器

Also Published As

Publication number Publication date
DE3465542D1 (en) 1987-09-24
EP0133802B1 (fr) 1987-08-19

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