EP0680060A1 - Drehtransformator - Google Patents

Drehtransformator Download PDF

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Publication number
EP0680060A1
EP0680060A1 EP95105433A EP95105433A EP0680060A1 EP 0680060 A1 EP0680060 A1 EP 0680060A1 EP 95105433 A EP95105433 A EP 95105433A EP 95105433 A EP95105433 A EP 95105433A EP 0680060 A1 EP0680060 A1 EP 0680060A1
Authority
EP
European Patent Office
Prior art keywords
primary
transformer
coil
stator
rotor
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Withdrawn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
EP95105433A
Other languages
English (en)
French (fr)
Inventor
Scott Anderson Reid
Paul Gregory Rops
Charles Joseph Tennies
Mark Allan Juds
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.)
Eaton Corp
Original Assignee
Eaton 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
Application filed by Eaton Corp filed Critical Eaton Corp
Publication of EP0680060A1 publication Critical patent/EP0680060A1/de
Withdrawn legal-status Critical Current

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    • 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 transformers of the type having the primary and secondary coils disposed for relative rotation such as for example where one or the other of the coils is mounted to a stationary structure and the other coil is mounted on a shaft or tube disposed for rotation concentrically with respect to the stationary coil.
  • rotary transformers have been employed for transmitting low level signals across a rotary junction for example in torque or rotary displacement transducers.
  • Devices of this sort are employed for providing a low level position or strain indicating signal generally for measurement or providing a control signal and have not heretofore been employed where it was desired or necessary to transmit any significant amount of power across such a rotary junction in a non-contact arrangement.
  • slip rings have the disadvantage that where an foreign matter can degrade the electrical contacting surfaces
  • spirally wound ribbon conductors have the disadvantage of requiring an expensive link of conductive material and requiring complicated and difficult assembly procedures when the steering wheel is installed in the vehicle.
  • a prior art transformer is indicated generally at 10 as having a rotatable shaft 12 disposed centrally within annular stator members 14,16.
  • a plastic rotor 18 is attached to the rotating shaft 12.
  • a stator member having a generally U-shaped configuration is denoted by reference numeral 20 and has a coil 28 wound on the inner surface of the outer leg thereof and has a second stator member 22 disposed axially adjacent thereto.
  • Rotor 18 has a rotating coil 30 mounted thereon for rotation with respect to coil 28.
  • the present invention provides a rotary transformer having annular stator and rotor magnetically permeable members having a generally U-shaped transverse section which has the legs of the U-shape interdigitated in an axial direction with the primary and secondary coils wound respectively on the adjacent legs of the U-shaped sections.
  • the transformer of the present invention has the primary coil mounted on the radially outer periphery of the inner leg of the U-shaped stator member; and, the secondary or output coil is wound on the inner surface of the radially outer leg of the U-shaped rotor member.
  • the transformer is particularly adapted for an automotive steering column application wherein the stator is mounted to the stationary column and the rotor is mounted to the steering shaft which passes therethrough.
  • the transformer is designed by an iterative process which optimizes the turns ratio and the amount of iron or ferromagnetic material to provide relatively high efficiency in the frequency range 2-5 kHz.
  • the transformer provides uniquely high power transmitting capabilities per unit of volume and per unit mass at the frequencies mentioned.
  • the transformer of the present invention is particularly suitable for transmitting signals from user actuated control buttons mounted on a steering wheel, such as those for radio operation or cruise control functions across the rotary steering column-shaft junction.
  • the transformer of the present invention is also uniquely suitable for transmitting power level signals at near saturation levels for firing an ignitor squib to inflate a vehicle occupant restraint airbag mounted on the vehicle steering wheel.
  • the transformer of the present invention is indicated generally at 100 and has an annular ferromagnetic stator member 102 having a generally U-shaped configuration in cross-section with the radially outer leg having a slightly greater axial extent than the radially inner leg of the U-shape.
  • An annular ferromagnetic rotor member 104 is disposed in concentric relationship with stator 102; and, rotor 104 has a generally U-shaped configuration in cross-section with the legs thereof interdigitated axially with the legs of the U-shape of stator 102.
  • the outer leg 106 of the U-shape of the rotor is disposed closely spaced adjacent the outer leg 108 of the U-shaped stator; and, the inner leg 110 of the rotor is spaced closely adjacent the inner periphery of the inner leg 112 of the stator.
  • a primary coil 114 is wound around the inner leg 112 of the stator; whereas, the output or secondary coil 116 is wound about the inner periphery of the outer leg 106 of the rotor.
  • equation 1 is then solved for I 1 .
  • equation 5. is then solved for ⁇ 2 .
  • the expression for ⁇ 2 is then substituted into equation 6, which is solved for ⁇ 3 .
  • equation 4 may then be solved for the secondary or output current 1 2 , by substituting for Z 2 from 2(a).
  • V 2 the transformer secondary, or output voltage is determined by differentiating and substituting for
  • the values of V 2 and 1 2 may be computed.
  • the secondary coil load was assumed to have a purely resistive nature with a value of 2.5Q. (Ohms) such as would be encountered in an electric firing squib.
  • N 1 was incremented from 10 to 100 turns of #20 AWG copper; and, N 2 was incremented from 10 to 100 turns of #20 AWG copper.
  • the input voltage V 1 was assumed to be 5 volts peak (3.5 VRMS) sinusoidal and the frequency ⁇ of V 1 incremented from 100 Hz to 50 kHz.
  • the primary current 11 is plotted as a function of the number of secondary turns N2 as a family of curves for the various incremented values of frequency in the range 100 Hz through 50 kHz. It is seen from the various plots in FIG. 8 that for a frequency of 2 kHz or above, optimum results are achieved with at least 40 turns N2 of a secondary coil.
  • a frequency of 2 kHz was chosen for the assumed transformer configuration and equations 1-8 were employed to compute the primary current 11 for various incremented values of the primary coil turns N1 in the range 10-100.
  • the results are plotted as a family of curves in FIG. 9. It is also seen from FIG. 9 that for a primary coil turn count N1 of 10, a secondary coil turn count N2 of 40 provides near optimum results with a sufficient margin below saturation.
  • a transformer having the above described dimensions was built and determined to have an overall weight of 341 grams and a volume of 83.4 cubic centimeters with a 10 turn primary and 40 turn secondary.
  • the transformer secondary was connected to 3.5 VRMS excitation on the primary coil and with a 2.5 ohm resistive load connected across the secondary coil, the transformer was operated at various primary voltage frequencies incremented from 100 to 5 kHz and the power output to the load measured.
  • the transformer was found to be substantially saturated with the primary voltage having a frequency of 100 Hz and the saturation flux density was determined to be 4800 gauss with 48 volt amperes RMS applied to the primary. The volts amperes applied to the primary and the output power were measured and the values are indicated in Table 1.
  • the values of the efficiency ratio for the transformer of the present invention are plotted for the incremented frequencies of the excitation voltage as the upper plot with the measured values indicated by the black squares.
  • the values of efficiency ratio for the incremented excitation frequency of the input voltage are plotted as the lower plot with measured values indicated by the black diamonds in FIG. 10 for the prior art transformer. It will be seen from comparing the upper and lower plot of FIG. 10 that the efficiency of the transformer of the present invention in frequency ranging from 1-2 kHz is on the order of seven times the efficiency of the prior art transformer.
  • the results of the computations of the output power of the transformer of FIG. 1 and FIG. 15 are presented in graphical form where the upper plot having the computed values shown in black squares represents the transformer of FIG. 1; whereas, the lower plot having the computed values illustrated in black diamonds represents the prior art transformer of FIG. 15. It will be apparent from FIG. 12 that the output power as a function of the volume of the transformer of FIG. 1 is three orders of magnitude greater than that of the prior art transformer of FIG. 15. For an excitation voltage of 5 volts peak or 3.5 volts RMS.
  • the power output of the transformer of FIG. 1 has been computed by linear simulation analysis, at saturation flux densities for incremented values of frequency and plotted as watts per cubic centimeter volume as a function of frequency with the computed points shown as black squares in the upper plot of FIG. 13.
  • the computed points are based on the data given in Table 1.
  • the data for power output at saturation flux densities at incremented values of frequency was determined from Table 1 for the transformer of the present invention and plotted as a function of watts output per gram of transformer weight for the various incremented values of frequency which are indicated by black squares in the plot of FIG. 14. It will be seen by comparing FIG. 13 with FIG. 12 and FIG. 14 with FIG. 11 that the performance of the transformer of FIG. 1 is improved by driving the transformer to saturation.
  • the present invention thus provides heretofore unobtainable power output and efficiency per unit volume and per unit mass of a rotary transformer.
  • the transformer of the present invention employs a unique interdigitated stator and rotor iron and coils which employ a U-shaped transverse configuration to the stator and rotor iron enabling the substantially higher output over a broader spectrum of frequencies than has been heretofore obtainable.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Steering Controls (AREA)
  • Coils Of Transformers For General Uses (AREA)
EP95105433A 1994-04-26 1995-04-11 Drehtransformator Withdrawn EP0680060A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US23366594A 1994-04-26 1994-04-26
US233665 1994-04-26

Publications (1)

Publication Number Publication Date
EP0680060A1 true EP0680060A1 (de) 1995-11-02

Family

ID=22878191

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95105433A Withdrawn EP0680060A1 (de) 1994-04-26 1995-04-11 Drehtransformator

Country Status (2)

Country Link
EP (1) EP0680060A1 (de)
JP (1) JPH0851041A (de)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000007283A1 (de) * 1998-07-30 2000-02-10 Robert Bosch Gmbh Elektrische maschine, insbesondere drehstromgenerator
EP1000812A2 (de) 1998-11-12 2000-05-17 Alps Electric Co., Ltd. Nichtleitende - Signalübertragungsvorrichtung
EP1157752A2 (de) * 2000-05-23 2001-11-28 HILTI Aktiengesellschaft Werkzeuggerät mit Ultraschalladapter
DE10351117B3 (de) * 2003-11-03 2005-02-17 Abb Research Ltd. Drehtransformator
US7135981B1 (en) 2004-10-12 2006-11-14 Teleflex Megatech Inc. Fuel level variation detector for marine vehicle
US7405540B2 (en) 2003-10-20 2008-07-29 Teleflex Megatech, Inc. Secondary power supply system and method of activating subsystems from a vehicle steering wheel
US7525449B1 (en) 2003-10-20 2009-04-28 Teleflex Megatech, Inc. Status light for switch on boat steering wheel
WO2009147552A1 (en) * 2008-06-02 2009-12-10 Philips Intellectual Property & Standards Gmbh Rotary power transformer and computer tomography gantry comprising same
US7672759B1 (en) 2004-02-24 2010-03-02 Teleflex Megatech, Inc. Communication with a steering wheel switch
WO2010105764A1 (de) * 2009-03-19 2010-09-23 Sew-Eurodrive Gmbh & Co. Kg Drehübertrager und fremderregte synchronmaschine
WO2012001309A1 (fr) * 2010-06-30 2012-01-05 Cybernetix Dispositif de connexion sans contact electrique permettant la transmission d'une puissance electrique triphasee
WO2012163919A3 (de) * 2011-05-30 2013-01-24 Herrmann Ultraschalltechnik Gmbh & Co. Kg Ultraschallschweissvorrichtung mit drehkoppler
EP2688078A1 (de) * 2012-07-17 2014-01-22 Stichting Nationaal Lucht- en Ruimtevaart Laboratorium Kontaktloser Strom- und Datentransfer
DE102014202719A1 (de) 2014-02-14 2015-08-20 Bmw Ag Induktiver Drehübertrager für einen Elektromotor für ein Kraftfahrzeug sowie entsprechendes Kopplerteil
RU2689121C1 (ru) * 2018-08-06 2019-05-24 Федеральное государственное бюджетное образовательное учреждение высшего образования "Кубанский государственный технологический университет" (ФГБОУ ВО "КубГТУ") Многофазный фазочастотный трансформатор-регулятор
US11456115B2 (en) 2016-05-11 2022-09-27 Ntn Corporation Electric transmission device in relatively rotating parts

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03260178A (ja) * 1990-03-06 1991-11-20 Showa Shell Sekiyu Kk 吸水保水性柔軟クロスの製造法
EP0926690A4 (de) * 1997-07-03 2000-12-20 Furukawa Electric Co Ltd Split-transformator und übertragungssteuerung mit dem split-transformator
US6512437B2 (en) 1997-07-03 2003-01-28 The Furukawa Electric Co., Ltd. Isolation transformer
DE10046659A1 (de) * 2000-09-20 2002-04-04 Bosch Gmbh Robert Induktiver Übertrager
JP2007208201A (ja) * 2006-02-06 2007-08-16 Nippon Soken Inc 非接触型電力供給装置
JP6710573B2 (ja) * 2016-05-11 2020-06-17 Ntn株式会社 相対回転部の電気伝送装置
DE102019128928B3 (de) * 2019-10-25 2021-01-14 Sick Ag Sensor und Verfahren zur Herstellung einer induktiven Energieübertragungseinheit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2432982A (en) * 1942-11-11 1947-12-23 Sperry Gyroscope Co Inc Inductive coupling
FR1595881A (de) * 1967-12-04 1970-06-15
FR2552260A1 (fr) * 1983-09-19 1985-03-22 Erevansky Politekhn Insti Transformateur annulaire rotatif monophase
DE3915188C1 (en) * 1989-05-10 1990-11-22 Daimler-Benz Aktiengesellschaft, 7000 Stuttgart, De Wireless interrogation and current supply method for switches - using capacitative and inductive elements corresp. to sec. winding of transformer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2432982A (en) * 1942-11-11 1947-12-23 Sperry Gyroscope Co Inc Inductive coupling
FR1595881A (de) * 1967-12-04 1970-06-15
FR2552260A1 (fr) * 1983-09-19 1985-03-22 Erevansky Politekhn Insti Transformateur annulaire rotatif monophase
DE3915188C1 (en) * 1989-05-10 1990-11-22 Daimler-Benz Aktiengesellschaft, 7000 Stuttgart, De Wireless interrogation and current supply method for switches - using capacitative and inductive elements corresp. to sec. winding of transformer

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000007283A1 (de) * 1998-07-30 2000-02-10 Robert Bosch Gmbh Elektrische maschine, insbesondere drehstromgenerator
US6333581B1 (en) 1998-07-30 2001-12-25 Robert Bosch Gmbh Alternator with exciting means arrangement
EP1000812A2 (de) 1998-11-12 2000-05-17 Alps Electric Co., Ltd. Nichtleitende - Signalübertragungsvorrichtung
EP1157752A2 (de) * 2000-05-23 2001-11-28 HILTI Aktiengesellschaft Werkzeuggerät mit Ultraschalladapter
DE10025352A1 (de) * 2000-05-23 2001-12-06 Hilti Ag Werkzeuggerät mit Ultraschalladapter
EP1157752A3 (de) * 2000-05-23 2004-05-26 HILTI Aktiengesellschaft Werkzeuggerät mit Ultraschalladapter
DE10025352B4 (de) * 2000-05-23 2007-09-20 Hilti Ag Werkzeuggerät mit einem Ultraschalladapter
US7405540B2 (en) 2003-10-20 2008-07-29 Teleflex Megatech, Inc. Secondary power supply system and method of activating subsystems from a vehicle steering wheel
US7525449B1 (en) 2003-10-20 2009-04-28 Teleflex Megatech, Inc. Status light for switch on boat steering wheel
DE10351117B3 (de) * 2003-11-03 2005-02-17 Abb Research Ltd. Drehtransformator
US7911307B2 (en) 2003-11-03 2011-03-22 Abb Research Ltd Rotary transformer
US7672759B1 (en) 2004-02-24 2010-03-02 Teleflex Megatech, Inc. Communication with a steering wheel switch
US7135981B1 (en) 2004-10-12 2006-11-14 Teleflex Megatech Inc. Fuel level variation detector for marine vehicle
WO2009147552A1 (en) * 2008-06-02 2009-12-10 Philips Intellectual Property & Standards Gmbh Rotary power transformer and computer tomography gantry comprising same
WO2010105764A1 (de) * 2009-03-19 2010-09-23 Sew-Eurodrive Gmbh & Co. Kg Drehübertrager und fremderregte synchronmaschine
GB2495241A (en) * 2010-06-30 2013-04-03 Cybernetix Connection device without electrical contact, allowing the transmission of three-phase electrical power
FR2962251A1 (fr) * 2010-06-30 2012-01-06 Cybernetix Dispositif de connexion sans contact electrique permettant la transmission d'une puissance electrique
WO2012001309A1 (fr) * 2010-06-30 2012-01-05 Cybernetix Dispositif de connexion sans contact electrique permettant la transmission d'une puissance electrique triphasee
WO2012163919A3 (de) * 2011-05-30 2013-01-24 Herrmann Ultraschalltechnik Gmbh & Co. Kg Ultraschallschweissvorrichtung mit drehkoppler
US8955574B2 (en) 2011-05-30 2015-02-17 Herrmann Ultraschalltechnik Gmbh & Co. Kg Ultrasonic welding device with rotary coupler
EP2688078A1 (de) * 2012-07-17 2014-01-22 Stichting Nationaal Lucht- en Ruimtevaart Laboratorium Kontaktloser Strom- und Datentransfer
WO2014012943A1 (en) * 2012-07-17 2014-01-23 Stichting Nationaal Lucht- En Ruimtevaart Laboratorium Contactless power and data transfer
US9812255B2 (en) 2012-07-17 2017-11-07 Stichting Nationaal Lucht-En Ruimtevaart Laboratorium Contactless power and data transfer
DE102014202719A1 (de) 2014-02-14 2015-08-20 Bmw Ag Induktiver Drehübertrager für einen Elektromotor für ein Kraftfahrzeug sowie entsprechendes Kopplerteil
DE102014202719B4 (de) 2014-02-14 2024-09-26 Bmw Ag Induktiver Drehübertrager für einen Elektromotor für ein Kraftfahrzeug sowie entsprechendes Kopplerteil
US11456115B2 (en) 2016-05-11 2022-09-27 Ntn Corporation Electric transmission device in relatively rotating parts
RU2689121C1 (ru) * 2018-08-06 2019-05-24 Федеральное государственное бюджетное образовательное учреждение высшего образования "Кубанский государственный технологический университет" (ФГБОУ ВО "КубГТУ") Многофазный фазочастотный трансформатор-регулятор

Also Published As

Publication number Publication date
JPH0851041A (ja) 1996-02-20

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