EP3131101A1 - Spulenkörper für eine elektrische spule, elektrische spule mit solch einem spulenkörper - Google Patents

Spulenkörper für eine elektrische spule, elektrische spule mit solch einem spulenkörper Download PDF

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Publication number
EP3131101A1
EP3131101A1 EP15180749.2A EP15180749A EP3131101A1 EP 3131101 A1 EP3131101 A1 EP 3131101A1 EP 15180749 A EP15180749 A EP 15180749A EP 3131101 A1 EP3131101 A1 EP 3131101A1
Authority
EP
European Patent Office
Prior art keywords
winding
separating element
coil
section
coil former
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Withdrawn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
EP15180749.2A
Other languages
English (en)
French (fr)
Inventor
Bostjan BREMEC
Tadej FLORIJANCIC
Tomaz PIRH
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.)
Mahle International GmbH
Original Assignee
Mahle International 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 Mahle International GmbH filed Critical Mahle International GmbH
Priority to EP15180749.2A priority Critical patent/EP3131101A1/de
Publication of EP3131101A1 publication Critical patent/EP3131101A1/de
Withdrawn legal-status Critical Current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
    • H01F5/00—Coils
    • H01F5/02—Coils wound on non-magnetic supports, e.g. formers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2823—Wires
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
    • H01F27/325—Coil bobbins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/02—Coils wound on non-magnetic supports, e.g. formers
    • H01F2005/022—Coils wound on non-magnetic supports, e.g. formers wound on formers with several winding chambers separated by flanges, e.g. for high voltage applications

Definitions

  • Electromagnetic coils are used in a variety of forms in vehicle construction. In particular, they are used in starter motors of modern internal combustion engines.
  • Such a coil generally comprises a primary winding, through which an alternating current is passed.
  • an induced electrical voltage is induced in a secondary winding interacting with the primary winding, and this causes an induced current in the secondary winding.
  • the induced electrical voltage which can be achieved in the coil is dependent on various parameters, in a known manner. Such parameters are, for example, the turns numbers of the primary and secondary windings and the respective electrical resistance of the two windings.
  • said windings are typically accommodated in a coil former of the coil, with the result that the two windings can be installed together with the coil former as one unit in the internal combustion engine.
  • the coil former has one or more suitably designed winding-accommodating regions for accommodating the windings.
  • An object of the present invention consists in demonstrating new approaches in the development of coil formers for electrical coils and in the development of electrical coils comprising such coil formers.
  • a coil former according to the invention for an electrical coil comprises a substantially cylindrical basic body, which has a circumferential wall. Said basic body is delimited along its axial direction by a first end wall and a second end wall, which is opposite the first end wall. The two end walls protrude in the radial direction beyond the circumferential wall. In this way, windings wound onto the circumferential wall can be held stably on the basic body.
  • a separating element is arranged axially between the two end walls, said separating element projecting radially outwards from the circumferential wall so as to form a first and a second axial winding-accommodating region.
  • the separating element has an aperture, by means of which the first axial winding-accommodating region is connected to the second axial winding-accommodating region.
  • the first winding section having a first winding direction can be connected electrically easily to the second winding section having a second winding direction, which is opposite the first winding direction.
  • the (first) winding can be passed through the aperture so that there is a transition in the aperture from the first to the second winding section.
  • the volume ratio of the two winding-accommodating regions can be varied. If the turns of the first winding have a first winding direction in the first winding-accommodating region, as already explained, and a second winding direction, which is opposite the first winding direction, in the second winding-accommodating region, by virtue of corresponding dimensioning of the volumes of the two winding-accommodating regions the ratio of the number of turns with the first winding direction to the number of turns with the second winding direction can be set or varied.
  • the induced electrical voltage produced in the coil and the electromagnetic force generated by the coil are dependent on this ratio and can thus be set by selecting the turns ratio without thereby changing the electrical resistance of the coil.
  • the desired electrical resistance can be set by the total number of provided turns in the first winding.
  • the two end walls protrude radially outwards beyond the separating element. This ensures that the turns of the winding cannot slide axially from the basic body of the coil former.
  • the separating element is in the form of a web extending in the circumferential direction on the circumferential wall.
  • This variant favours an embodiment of the separating element which is particularly simple in design terms and therefore inexpensive.
  • said web is formed integrally on the circumferential wall of the basic body.
  • the aperture provided in the separating element is in the form of an interruption, preferably a slot-like interruption, provided in the web.
  • an interruption in the web in particular in the form of a slot, makes it possible in a simple manner to pass the first winding from the first winding-accommodating region into the second winding-accommodating region.
  • the separating element can be arranged, in the axial direction, centrally between the two end walls.
  • the two winding-accommodating regions can be provided with substantially the same dimensions, with the result that the same number of turns can be accommodated in the first accommodating region as in the second winding-accommodating region.
  • the ratio of the number of turns in the first winding section to the number of turns in the second winding section is in this case 1:1.
  • the induced voltage produced by the turns increases so that the induced voltage actually produced in the first winding is determined by the turns of the third winding section alone, which is arranged radially outwards on the first two winding sections.
  • the turns of the first and second winding sections therefore serve the purpose of setting the electrical resistance of the first winding.
  • the separating element is arranged, in the axial direction, at a shorter distance from the first end wall than from the second end wall, or vice versa. In this way, an unequal volume ratio and therefore a different number of turns in the two winding sections is achieved for the two winding-accommodating regions. This results in a net induced voltage produced in the first and second winding sections of the first winding which is different from zero. The same applies also to the electromagnetic force generated by the coil.
  • At least one additional separating element which acts as spacer element and protrudes radially outwards from the circumferential wall, is arranged axially in the region between the separating element and the first or second end wall.
  • the radius of the separating element differs from the radius of the at least one additional separating element.
  • At least two additional separating elements acting as spacer elements are provided.
  • the radii of at least two, preferably of all provided, additional separating elements are different. In this way, the volumes of the two winding-accommodating regions can be varied in a very flexible manner, with the result that the ratio of the turns with the opposite winding direction can also be set easily to the desired value.
  • the invention also relates to an electrical coil comprising an above-described coil former and a first winding, which is arranged on the circumferential wall and has a first, a second and a third winding section.
  • the first winding section is arranged in the first axial winding-accommodating region.
  • the second winding section is arranged in the second axial winding-accommodating region.
  • the third winding section is arranged radially outwards on the first and second winding sections.
  • a second winding is arranged radially outwards on the third winding section of the first winding. This second winding can act as primary winding of the coil, whereas the first winding can act as secondary winding, in which an induced electrical voltage can be produced.
  • a first winding direction of the first winding section extends opposite to a second winding direction and a third winding direction of the second and third winding sections.
  • an uneven number of winding layers, counted in the radial direction of the coil former, of the first winding section is arranged in the first winding-accommodating region.
  • the arrangement is such that the first winding-accommodating region is filled substantially completely (existing interspaces between the individual conductors of the winding are not taken into consideration here) with the first winding section of the first winding.
  • an uneven number of winding layers, counted in the radial direction, of the second winding section can also be arranged in the second winding-accommodating region.
  • the arrangement of these winding layers is also preferably such that the second winding-accommodating region is filled substantially completely (existing interspaces between the individual conductors of the winding are not considered here) with the second winding section of the first winding.
  • an uneven number of winding layers, counted in the radial direction of the coil former, of the first winding section can be arranged radially outside the two winding-accommodating regions.
  • the third winding section can be arranged radially outside the separating element. This enables optimum use of the volume provided by the two winding-accommodating regions for accommodating the first winding.
  • the third winding section and/or the second winding can extend between the two end walls over the total axial length of the coil former.
  • the first winding section is connected to the second winding section via the interruption provided in the separating element.
  • a winding diameter of the first winding can be greater than a winding diameter of the second winding. This makes it possible for the first winding to also be able to carry very high currents induced in the first winding.
  • the invention relates to a starter motor of an internal combustion engine comprising at least one above-explained electrical coil.
  • Figure 1 illustrates the design of the coil former 2 of an electrical coil 1 according to the invention in a perspective illustration.
  • Figure 2 shows the coil former 2 from Figure 1 in a longitudinal section along its mid-longitudinal axis M.
  • the coil former has a cylindrical basic body 3, which has a circumferential wall 4.
  • the coil former 2 is delimited along its axial direction A, which is defined by the mid-longitudinal axis M of the coil former 2, by a first end wall 5a and a second end wall 5b, which is opposite the first end wall 5a.
  • the two end walls 5a, 5b can protrude in the radial direction R of the coil former 2 beyond the circumferential wall 4, as shown in Figure 1 .
  • a separating element 6 is arranged between the two end walls 5a, 5b.
  • the separating element 6 projects radially outwards from the circumferential wall 4 so as to form a first and a second axial winding-accommodating region 9a, 9b.
  • the separating element 6 has an aperture 17, by means of which the first axial winding-accommodating region 9a is connected to the second axial winding-accommodating region 9b.
  • the separating element 6 is in the form of a web 7, which extends in the circumferential direction U of the cylindrical basic body 3 on the circumferential wall 4.
  • the web 7 has, in the circumferential direction U, a slot-like interruption 8 (cf. Figure 1 ), which forms the aperture 17.
  • the interruption 8 the first axial winding-accommodating region 9a is connected to the second axial winding-accommodating region 9b, with the result that a winding can be passed through the aperture 17.
  • the separating element 6 in the form of a web 7 is arranged centrally, with respect to the axial direction A, between the two end walls 5a, 5b, with the result that the two winding-accommodating regions 9a, 9b have substantially the same volume.
  • the separating element 6 can be arranged, in the axial direction A, closer at a shorter distance from the second end wall 5b than from the first end wall 5a, or vice versa.
  • FIG 3 shows, in a longitudinal section, an example of an electrical coil 1 according to the invention comprising the coil former 2 from Figures 1 and 2 in a longitudinal section.
  • a first winding 10 is arranged on the circumferential wall 4.
  • the first winding 10 has a first, a second and a third winding section 11 a, 11 b, 11c, which are formed by a suitable electrical conductor, for example a copper wire.
  • the first winding section 11 a in this case becomes the second winding section 11 b, and the second winding section 11 b becomes the third winding section 11 c.
  • the three winding sections 11 a, 11 b, 11c are formed integrally with one another and are connected electrically to one another directly in this way.
  • the first winding section 11 a is arranged completely in the first axial winding-accommodating region 9a, and the second winding section 11 b is arranged in the second axial winding-accommodating region 9b.
  • the third winding section 11 c is in turn arranged radially outwards both on the first and the second winding sections 11a, 11b.
  • the third winding section 11c is preferably arranged radially outside the separating element 6.
  • the third winding section 11c extends between the two end walls 5a, 5b over the total axial length L of the coil former 2.
  • the winding direction of the three winding sections 11 a, 11 b, 11 c of the first winding 10 is indicated by the symbols denoted by the reference signs 12, 13.
  • a first winding direction R 1 of the first winding section 11a accordingly runs in opposition to a second winding direction R 2 and a third winding direction R 3 of the second and third winding sections 11 b, 11c, respectively.
  • an uneven number of winding layers 18a, counted in the radial direction R, namely by way of example three winding layers 18a, of the first winding section 11 a is arranged in the first winding-accommodating region 9a.
  • the arrangement of the winding layers 18a is such that the first winding-accommodating region 9a is filled substantially completely with the first winding section 11a.
  • an uneven number of winding layers 18b, counted in the radial direction R of the coil former 2, of the second winding section 11 b is also arranged in the second winding-accommodating region 9b.
  • by way of example three winding layers 18b are provided.
  • the arrangement of these winding layers is also such that the second winding-accommodating region 9b is filled substantially completely with the second winding section 11 b of the first winding 10.
  • an uneven number of winding layers 18c, counted in the radial direction R, of the third winding section 11 c can also be arranged radially outside the two winding-accommodating regions 9a, 9b.
  • only a single winding layer 18c of the first winding 10 is provided by way of example.
  • the first winding section 11 a is connected to the second winding section 11 b via the interruption 8 (not shown in Figure 3 ; cf. in this regard Figure 1 ) provided in the separating element 6.
  • the interruption 8 not shown in Figure 3 ; cf. in this regard Figure 1
  • the reversal of the winding direction R 1 , R 2 from the first to the second winding section 11 a, 11 b can also be implemented in a technically simple manner.
  • a second winding 14 is also arranged radially outwards on the third winding section 11c.
  • the second winding 14 can be electrically insulated from the first winding 10 by means of a suitable separating wall 15.
  • a winding diameter D 1 of the first winding 10 is greater than a winding diameter D 2 of the second winding 14.
  • the second winding 14 extends, in the same way as the third winding section 11c of the first winding 10, between the two end walls 5a, 5b beyond the total axial length L of the coil former 2.
  • Figure 4 shows a variant of the example shown in Figure 3 .
  • four additional separating elements acting as spacer elements 16a, 16b, 16c, 16d are provided.
  • the spacer elements 16a-16d project in the form of a respective web 7 from the circumferential wall 4 in a similar manner to the separating element 6.
  • the spacer elements 16a-16d can be formed as separate component parts or formed integrally on the basic body 3.
  • the radius of each of the spacer elements 16a-16d differs from the radius of the remaining spacer elements 16a-16d and from the radius of the separating element 6.
  • the first spacer element 16a rests on the separating element 6 on the end side.
  • the second spacer element 16b rests on the third spacer element 16c on the end side, and the third spacer element 16c rests on the second end wall 5b on the end side.
  • the arrangement of the spacer elements 16a-16d with respect to one another, with respect to the separating element 6 and with respect to the two end walls 5a, 5b can vary.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
EP15180749.2A 2015-08-12 2015-08-12 Spulenkörper für eine elektrische spule, elektrische spule mit solch einem spulenkörper Withdrawn EP3131101A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15180749.2A EP3131101A1 (de) 2015-08-12 2015-08-12 Spulenkörper für eine elektrische spule, elektrische spule mit solch einem spulenkörper

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15180749.2A EP3131101A1 (de) 2015-08-12 2015-08-12 Spulenkörper für eine elektrische spule, elektrische spule mit solch einem spulenkörper

Publications (1)

Publication Number Publication Date
EP3131101A1 true EP3131101A1 (de) 2017-02-15

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3618085A1 (de) 2018-08-28 2020-03-04 Mahle International GmbH Wickelträger für einen elektromagnetischen schalter
EP3617495A1 (de) 2018-08-28 2020-03-04 Mahle International GmbH Elektromagnetischer schalter
EP3617494A1 (de) 2018-08-28 2020-03-04 Mahle International GmbH Elektromagnetischer schalter für eine startvorrichtung
DE102019117906A1 (de) * 2019-07-03 2021-01-07 Eto Magnetic Gmbh Mehrkammerige Magnetspuleneinheit und Verfahren zur Herstellung der mehrkammerigen Magnetspuleneinheit
GB2586505A (en) * 2019-08-23 2021-02-24 Siemens Healthcare Ltd A method for assembly of a monolithically impregnated cylindrical coil assembly

Citations (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3644986A (en) * 1969-11-26 1972-02-29 Gen Electric Method of tuning high-voltage transformer for television receiver
US3947793A (en) * 1975-03-10 1976-03-30 Rca Corporation Multi-layer toroidal deflection yoke
FR2309023A1 (fr) * 1975-04-23 1976-11-19 Plessey Handel Investment Ag Carcasse isolante pour enroulements electriques
DE3038672A1 (de) * 1980-10-14 1982-05-27 Sachße, Brigitte, 8500 Nürnberg Kammerspulenkoerper und verfahren zu dessen automatischer bewicklung
DE3428241A1 (de) * 1984-07-31 1986-02-06 REO Boris von Wolff GmbH & Cie, 5650 Solingen Spulenkoerper fuer hochspannungswicklungen
US4779068A (en) * 1985-09-06 1988-10-18 Murata Manufacturing Co., Ltd. Noise suppression inductor
EP0735552A1 (de) * 1995-03-27 1996-10-02 Deutsche Thomson-Brandt Gmbh Hochspannungstransformator für einen Fernsehempfänger
US20050212644A1 (en) * 2002-06-11 2005-09-29 Hitoshi Yoshimori Air-core coil and manufacturing method thereof
US20070290781A1 (en) * 2006-06-14 2007-12-20 Wen-Sheng Chen Coil frame capable of connecting with another coil frame
WO2008009731A1 (de) * 2006-07-18 2008-01-24 Robert Bosch Gmbh Spulenanordnung mit einem spulenträger eines elektromagnetischen antriebs
US20110260562A1 (en) * 2010-04-26 2011-10-27 Remy International, Inc. Solenoid with Reverse Turn Spool Hub Projection
US20120068475A1 (en) * 2010-09-21 2012-03-22 Remy International, Inc. Starter motor assembly with soft start solenoid
US20120068796A1 (en) * 2010-09-21 2012-03-22 Remy International, Inc. Starter motor solenoid with variable reluctance plunger
DE102011082236A1 (de) * 2010-10-05 2012-04-05 Robert Bosch Gmbh Zündspule mit reduzierter Bauteileanzahl
US20120140525A1 (en) * 2010-12-01 2012-06-07 Power Integrations, Inc. Energy transfer assembly with tuned leakage inductance and common mode noise compensation
US20130002386A1 (en) * 2011-06-30 2013-01-03 Samsung Electro-Mechanics Co., Ltd. Transformer and display device using the same
DE102011116861A1 (de) * 2011-10-25 2013-04-25 Epcos Ag Elektronisches Bauelement zur Führung eines Magnetfeldes
US20140153209A1 (en) * 2012-11-30 2014-06-05 Samsung Electro-Mechanics Co., Ltd. Coil component and display device including the same
DE102014114610A1 (de) * 2013-10-09 2015-04-09 Tdk Corporation Spulenvorrichtung

Patent Citations (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3644986A (en) * 1969-11-26 1972-02-29 Gen Electric Method of tuning high-voltage transformer for television receiver
US3947793A (en) * 1975-03-10 1976-03-30 Rca Corporation Multi-layer toroidal deflection yoke
FR2309023A1 (fr) * 1975-04-23 1976-11-19 Plessey Handel Investment Ag Carcasse isolante pour enroulements electriques
DE3038672A1 (de) * 1980-10-14 1982-05-27 Sachße, Brigitte, 8500 Nürnberg Kammerspulenkoerper und verfahren zu dessen automatischer bewicklung
DE3428241A1 (de) * 1984-07-31 1986-02-06 REO Boris von Wolff GmbH & Cie, 5650 Solingen Spulenkoerper fuer hochspannungswicklungen
US4779068A (en) * 1985-09-06 1988-10-18 Murata Manufacturing Co., Ltd. Noise suppression inductor
EP0735552A1 (de) * 1995-03-27 1996-10-02 Deutsche Thomson-Brandt Gmbh Hochspannungstransformator für einen Fernsehempfänger
US20050212644A1 (en) * 2002-06-11 2005-09-29 Hitoshi Yoshimori Air-core coil and manufacturing method thereof
US20070290781A1 (en) * 2006-06-14 2007-12-20 Wen-Sheng Chen Coil frame capable of connecting with another coil frame
WO2008009731A1 (de) * 2006-07-18 2008-01-24 Robert Bosch Gmbh Spulenanordnung mit einem spulenträger eines elektromagnetischen antriebs
US20110260562A1 (en) * 2010-04-26 2011-10-27 Remy International, Inc. Solenoid with Reverse Turn Spool Hub Projection
US20120068475A1 (en) * 2010-09-21 2012-03-22 Remy International, Inc. Starter motor assembly with soft start solenoid
US20120068796A1 (en) * 2010-09-21 2012-03-22 Remy International, Inc. Starter motor solenoid with variable reluctance plunger
DE102011082236A1 (de) * 2010-10-05 2012-04-05 Robert Bosch Gmbh Zündspule mit reduzierter Bauteileanzahl
US20120140525A1 (en) * 2010-12-01 2012-06-07 Power Integrations, Inc. Energy transfer assembly with tuned leakage inductance and common mode noise compensation
US20130002386A1 (en) * 2011-06-30 2013-01-03 Samsung Electro-Mechanics Co., Ltd. Transformer and display device using the same
DE102011116861A1 (de) * 2011-10-25 2013-04-25 Epcos Ag Elektronisches Bauelement zur Führung eines Magnetfeldes
US20140153209A1 (en) * 2012-11-30 2014-06-05 Samsung Electro-Mechanics Co., Ltd. Coil component and display device including the same
DE102014114610A1 (de) * 2013-10-09 2015-04-09 Tdk Corporation Spulenvorrichtung

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3618085A1 (de) 2018-08-28 2020-03-04 Mahle International GmbH Wickelträger für einen elektromagnetischen schalter
EP3617495A1 (de) 2018-08-28 2020-03-04 Mahle International GmbH Elektromagnetischer schalter
EP3617494A1 (de) 2018-08-28 2020-03-04 Mahle International GmbH Elektromagnetischer schalter für eine startvorrichtung
CN110867292A (zh) * 2018-08-28 2020-03-06 马勒国际有限公司 用于电磁开关的线圈载体
CN110867345A (zh) * 2018-08-28 2020-03-06 马勒国际有限公司 用于起动装置的电磁开关
US11011334B2 (en) 2018-08-28 2021-05-18 Mahle International Gmbh Electromagnetic switch
US11335526B2 (en) 2018-08-28 2022-05-17 Mahle International Gmbh Coil carrier for an electromagnetic switch
US11495426B2 (en) 2018-08-28 2022-11-08 Mahle International Gmbh Electromagnetic switch for a starting device
DE102019117906A1 (de) * 2019-07-03 2021-01-07 Eto Magnetic Gmbh Mehrkammerige Magnetspuleneinheit und Verfahren zur Herstellung der mehrkammerigen Magnetspuleneinheit
GB2586505A (en) * 2019-08-23 2021-02-24 Siemens Healthcare Ltd A method for assembly of a monolithically impregnated cylindrical coil assembly
GB2586505B (en) * 2019-08-23 2021-10-20 Siemens Healthcare Ltd A method for assembly of a monolithically impregnated cylindrical coil assembly

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