SE543840C2 - A device and a method for the production of a wave-shaped bent wire - Google Patents
A device and a method for the production of a wave-shaped bent wireInfo
- Publication number
- SE543840C2 SE543840C2 SE1951447A SE1951447A SE543840C2 SE 543840 C2 SE543840 C2 SE 543840C2 SE 1951447 A SE1951447 A SE 1951447A SE 1951447 A SE1951447 A SE 1951447A SE 543840 C2 SE543840 C2 SE 543840C2
- Authority
- SE
- Sweden
- Prior art keywords
- wire
- wire guide
- neighboring
- joint
- elements
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/04—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of windings, prior to mounting into machines
- H02K15/0435—Wound windings
- H02K15/0478—Wave windings, undulated windings
Abstract
A device for the production of a wave-shaped bent wire (4), to be used as stator winding in an electric machine, said device comprising: a plurality of link elements (1a, 1b), each link element (1a, 1b) being hingedly connected at an end thereof to a neighboring link element (1a, 1b) through a joint (2a, 2b), a first wire guide element (3a, 3b) arranged in connection to said joint (2a, 2b) and configured to form a support around which a wire (4) is bent, and a holder arrangement (5) configured to hold each second joint (2a, 2b) in a fixed position in a lateral direction (z) while enabling displacement of the joint (2a, 2b) in a longitudinal direction (x) of the device, which is perpendicular to said lateral direction (z).
Description
A device and a method for the production of a wave-shapedbent wire TECHNICAL FIELD The present invention relates to a device for the production of awave-shaped bent wire, to be used as stator winding in an electric machine.
The present invention also relates to a method of producing awave-shaped bent wire, to be used as stator winding in an electric machine.
BACKGROUND AND PRIOR ARTElectric machines, such as electric engines and generators,comprise a fixed stator having a stator winding and a rotor.Typically, the stator has longitudinal grooves on its inner peripheryor on its outer periphery, which form receiving spaces for the statorwinding. The winding is a copper wire which may comprise aplurality of bent wires. The production of the bent wires is time-consuming and should be such that damages on the wire is avoided and with a minimum of wear on the wire bending equipment.
DE 102016203167 discloses a device for the production of a wave-shaped bent wire, to be used as stator winding in an electricmachine. The device disclosed in DE 102016203167 comprises aplurality of discrete forming tools that are arranged on a holderto move in a arrangement that allows each forming tool longitudinal direction of the holder arrangement and to bepivotable around an axis which is perpendicular to the longitudinaldirection. Each forming tool has a guide element around which thewire is to bent upon pivotation of the respective forming tool. ln afirst position of the forming tools, a straight wire extending in saidlongitudinal direction of the device is allowed to extend betweeneach pair of neighboring wire guide elements. By pivoting theforming tools of each pair of neighboring forming tools in oppositedirections, a straight wire extending between the wire guideelements in said first position is bent to follow a wave-shaped path provided for in a second position.
OBJECT OF THE INVENTION lt is an object of the present invention to present an alternativedesign of a device and a method for the production of a wave-shaped bent wire, to be used as stator winding in an electric machine.
The device and method should be such that damages on the wireis avoided and with a minimum of wear on the wire bendingequipment. The device and method should also enable manualoperation of the device, with a low requirement of tools or auxiliary machines to accomplish the bending.
SUMMARY The object of the invention is achieved with a device for the production of a wave-shaped bent wire, to be used as stator winding in an electric machine, said device comprising: - a plurality of link elements, each link element being hingedlyconnected at an end thereof to a neighboring link element througha joint, - a first wire guide element arranged in connection to said joint andconfigured to form a support around which a wire is bent, - a holder arrangement configured to hold each second joint in afixed position in a lateral direction while enabling displacement ofthe joint in a longitudinal direction of the device, which is perpendicular to said lateral direction.
The interlinking of the link elements, and the positioning of the firstwire guide element in connection to the joint, results in a well-defined bending of the wire. A very smooth bending of the wire isachieved and the risk of having a damage on the wire in the region of the bend is very small.
According to one embodiment, said first wire guide elementcomprises a roll which is rotably arranged and which has acircumferential surface configured to form a support surface forthe wire during bending thereof. The use of a rotary roll furtherreduces wear on the first wire guide element, and also on the wire that is being bent.
According to one embodiment, said joint comprises a shaft viawhich neighboring link elements are hingedly connected, and said roll is coaxial with and supported by said shaft.
According to one embodiment, the device is characterized in thatadjacent to each first wire guide element, there is provided a second wire guide element on a first link element of a pair of neighboring link elements and a third wire guide element on thesecond link element of said pair of neighboring link elements. Byadding further wire guide elements on each link element, further bending, and further support of the wire is obtained.
According to one embodiment, the link elements are configured tobe positioned in - a first position in which neighboring first wire guide elements aredisplaced in relation to each other in said lateral direction suchthat a straight wire extending in said longitudinal direction of thedevice is allowed to extend between each pair of neighboring firstwire guide elements, and - a second position in which each second of said first wire guidesis displaced in a lateral direction, through an internal rotation ofpairs of neighboring link elements around their associated joints,such that a straight wire extending between the first wire guide elements in said first position is bent to follow a wave-shaped path.
According to one embodiment, the device comprises - a fixing device configured to fix one end of a wire to be bent tosaid wave-shape in the device, and - a straining device configured to enable a second end of said wireto move in said longitudinal direction of the device as a result of adisplacement of each second of said first wire guide elements insaid lateral direction, wherein the straining device applies apredetermined counter-force against said movement of the secondwire end. The straining device should generate a counterforcelarge enough to guarantee that the bent wire follows the expectedwave-shape and is bent appropriately around the respective wire guide element.
According to one embodiment, the device comprises aninterlocking arrangement configured to interlock the positions ofthe link elements when the device is in said second position. Theinterlocking arrangement preferably comprises connecting rodsconfigured to be attached to neighboring link elements when thelatter are in the second position. However, alternativeembodiments may include other solutions, such as holes arrangedin a support surface and taps or scres extending from a lowersurface of the link elements being inserted into such holes for thepurpose of fixing the link elements in predetermined positions, corresponding to the second position of the device.
According to one embodiment, the device also comprises a furtherinterlocking arrangement for locking the device in the first position.The further interlocking arrangement may comprise further strutconfigured to interlock and thereby fix the link elements in the firstposition. Alternative embodiments may include other solutions,such as holes arranged in a support surface and taps or scresextending from a lower surface of the link elements being insertedinto such holes for the purpose of fixing the link elements inpredetermined positions, corresponding to the first position of thedevice.
The object of the invention is also achieved by a method ofproducing of a wave-shaped bent wire, to be used as statorwinding in an electric machine, said method comprising the stepsof: a) arranging the link elements of a device according to the invention in a first position in which neighboring first wire guide elements are displaced in relation to each other in said lateraldirection such that a straight wire extending in said longitudinaldirection of the device is allowed to extend between each pair ofneighboring first wire guide elements, b) positioning a straight wire such that it extends in saidlongitudinal direction of the device between each pair ofneighboring first wire guide elements, c) rearranging the device into a second positon by displacing eachsecond of said first wire guides in a lateral direction, through aninternal rotation of pairs of neighboring link elements around theirassociated joints, such that a straight wire extending between thefirst wire guide elements in said first position is bent to follow awave-shaped path provided for in said second position.According to one embodiment, prior to step c) the methodcomprises the steps of - fixing one end of the wire to be bent to said wave-shape in thedevice, and - applying a counter-force against movement of a second wire end towards the first end as a result of step c).
According to one embodiment, the method comprises the furtherstep of interlocking the positions of neighboring link elements afterdisplacement thereof to a position corresponding to the position they will have in the second position.
According to one embodiment, the rearrangement of the linkelements from the first position to the second position is a stepwise procedure in which one link at a time is moved to a position corresponding to said second position of the device. A power is applied in said lateral direction to the joint or to the neighboringlink elements in the region of their common join, which is not oneof the joints which prevented by the holding arrangement frombeing displaced in the lateral direction. Once link element hasreached a position corresponding to its position in said secondposition of the device, it is connected to the neighboring linkelement that, in a foregoing step has been moved to a position corresponding to its position in said second position of the device.
BRIEF DESCRIPTION OF THE DRAWING Fig. 1 is a perspective view showing a device according to thepresent invention in a first position, Fig. 2 is an enlarged view of a part of the device shown in fig. 1,Fig. 3 is a perspective view showing a device according to theinvention in a second position, after completion of a rearrangingsequence,and Fig. 4 is a perspective view of the device shown in fig. 3, ready for removal of a wave-shaped wire therefrom.
DETAILED DESCRIPTION OF EMBODII\/IENTS Figs. 1-4 shows different operational positions of a deviceaccording to the present invention for the production of a wave-shaped bent wire, to be used as stator winding in an electric machine.
The device comprises a plurality of link elements 1a, 1b each linkelement 1a, 1b being hingedly connected at an end thereof to a neighboring link element 1b, 1a through a joint 2a, 2b.
The device further comprises a first wire guide element 3a, 3barranged in connection to said joint 2a, 2b and configured to form a support around which a wire 4 is bent.
A holder arrangement 5 (shown only in fig 3) is configured to holdeach second joint 2b in a fixed position in a lateral direction z whileenabling displacement of the joint 2b in a longitudinal direction xof the device, which is perpendicular to said lateral direction z. lnthe embodiment shown, the holder arrangement 5 comprises a rail15 to which each second 2b of the joints 2a, 2b is connected via arod 16 which is anchored in the rail 15 in a way that enables it toslide in said longitudinal direction. The link elements 1a, 1b andthe rail15 are arranged on a support surface 17, preferably anupper surface of a table. Another feasible solution, instead ofusing the rail 15 and the rods 16, would be to let a tap, preferablya prolonged center shaft of each second joint 2b, protrude into agroove extending in said longitudinal direction in the supportsurface 16, thereby preventing movement of that joint 2b in saidin said lateral direction z and allowing movement thereof longitudinal direction x.
Each of the first wire guide elements 3a, 3b comprises a roll whichis rotably arranged and which has a circumferential surfaceconfigured to form a support surface for the wire 4 during bendingthereof. A groove for receiving the wire 4 is thus arranged on the outer peripheral surface of the rolls.
Each joint 2a, 2b comprises a shaft via which neighboring linkelements 1a, 1b are hingedly connected, and the roll is coaxial with and supported by the shaft.
Adjacent to each first wire guide element 3a, 3b, there is provideda second wire guide element 8a on a first link element 1a of a pairof neighboring link elements 1a, 1b and a third wire guide element8b on the second link element 1b of said pair of neighboring link elements 1a, 1b.
Each of the second wire guide elements 8a and the third wire guideelements 8b comprises a roll which is rotably arranged and whichhas a circumferential surface configured to form a support surface for the wire during bending thereof.
With reference to figs. 1 and fig. 2, the link elements 1a, 1b areconfigured to be positioned in a first position in which neighboringfirst wire guide elements 3a, 3b are displaced in relation to eachother in said lateral direction such that a straight wire extending insaid longitudinal direction of the device is allowed to extendbetween each pair of neighboring first wire guide elements 3a, 3b.The link elements 1a, 1b are thus configured to generate a straightpath in said longitudinal direction such that the surfaces of the firstwire guide elements 3 around which the wire is to be bent arealternatingly directed towards that path from opposite sides of the path.
The link elements 1a, 1b are also configured to be positioned in asecond position in which each second 3a of said first wire guide elements 3a, 3b is displaced in a lateral direction in relation to the remaining first wire guide elements 3b, through an internal rotation of pairs of neighboring link elements 1a, 1b around theirassociated joints 2a, 2b, such that a straight wire 4 extendingbetween the first wire guide elements in said first position is bentto follow a wave-shaped path. Such a second position is shown in figs. 3 and 4.
The device further comprises a fixing device 10 configured to fixone end of a wire to be bent to said wave-shape in the device.There is also provided a straining device 11 configured to enablea second end of said wire 4 to move in said longitudinal directionof the device as a result of the internal displacement of eachsecond of said first wire guide elements 3b in said lateral directionin relation to the remaining first wire guide elements 3a. Thestraining device 11 applies a predetermined counter-force againstsaid movement of the second end of the wire 4. ln the embodimentshown, the straining device 11 comprises a clamping device 19.The wire 4 extends through the clamping device and the counter-force is controlled by controlling the friction between the clampingdevice and the wire 4. The fixing device 10 and the straining device11 are attached to the support surface 17. ln the embodimentshown, the fixing device 10 and the straining device 11 areintegrated with a respective link element 1a, 1b the opposite endsof the plurality of interconnected link elements 1a, 1b. The fixingdevice 10 has fixing means, preferably one or more taps on a lowerside thereof, by means of which it can be fixed in position withregard to the support surface 17. The support surface 17 may havepredetermined holes therein into which such a tap of the fixingdevice 10 is inserted. The fixing device 10 has a clamp 18 for fixing the end of the wire 4. The straining device 11 may be of similar 11 design as the fixing device 10, having a similar clamp 19 by means of which the counterforce is adjusted.
As is indicated in fig. 3, the device comprises an interlockingarrangement 12 configured to interlock the positions of the linkelements 1a, 1b when the device is in said second position. ln theexemplifying embodiment shown here, the interlockingarrangement 12 comprises struts 13. The struts 13 have ho|es (notshown) into which taps 14 on the link elements 1a, 1b are inserted.The taps are elongations of shafts on which the second and thirdwire guide elements 8a, 8b are rotably arranged. ln fig. 3, thestruts 13 are shown schematically. The struts 13 thus fix theinternal position of the link elements 1a, 1b once the latter havebeen moved to said position.
With reference to fig. 1. The device also comprises a furtherinterlocking arrangement for locking the device in the first position.ln the embodiment shown, the further interlocking arrangementcomprises further struts 20 configured to interlock and thereby fixthe link elements 1a, 1b in the first position. Each further strut 20is configured to extend between and be connected to neighboringpairs of first guide wire elements 3b that are connected to the rail15 via the rods 16, thereby fixing the distance in the longitudinaldirection x between all the first guide wire elements 3b that areconnected to the rail 15 via the rods 16. Likewise to the first struts13, the further struts 20 may have openings into which taps 14,arranged on the link elements 1a, 1b, preferably shafts of the joints2a, 2b, can extend for the purpose of attaching the further struts20 to the respective joint 2b and first guide wire element 3b associated thereto. 12 The invention method of bending a wire by means of the above-described device comprises the steps of: a) arranging the link elements 1a, 1b of the device in the firstposition in which neighboring first wire guide elements 3a, 3b aredisplaced in relation to each other in said lateral z direction suchthat a straight wire 4 extending in said longitudinal direction of thedevice is allowed to extend between each pair of neighboring firstwire guide elements 3a, 3b. The distance in the longitudinaldirection x between all the first guide wire elements 3b that areconnected to the rail 15 via the rods 16 is fixed by means of thefurther struts 20, and the fixing device 10 is attached to the support surface 17, preferably by means of a screw joint. b) positioning a straight wire 4 such that it extends in saidlongitudinal x direction of the device between each pair ofneighboring first wire guide elements 3a, 3b, and fixing a first endof the wire 4 in the fixing device 10 and letting another end of the wire 4 protrude through the clamp of the straining device 11, and c) rearranging the device into a second positon by displacing eachsecond 3a of said first wire guides 3a, 3b in the lateral direction z,thereby causing an internal rotation of pairs of neighboring linkelements 1a, 1b around their associated joints 2a, 2b, such thatthe straight wire 4 extending between the first wire guide elements3a, 3b in said first position is bent to follow a wave-shaped path provided for in said second position.
The rearrangement from the first position to the second position is a stepwise rearrangement sequence, beginning a pivotation of the 13 end link element 1a that is integrated with the fixing device 10approximately 180° from the first position, such that the wire isbent approximately 180° around the first wire guide element 3bwhich is associated to the joint 2b, which is prevented from amotion in the lateral direction z since it is connected to the rail 15via its associated rod 16. The end link element 1a, together withthe fixing device 10 is then fixed to the support surface 17 in thepivoted position. This is followed by a removal of the further strut20 most adjacent to and connected to the joint 2b which isconnected the end link element 1a, and thereafter the first linkelement 1a is fixed in its position relative the neighboring first link element 1b by mean of a first strut 13. ln a following step, the joint 2a nearest to the above-mentionedjoint 2b is pulled away from the above-mentioned joint 2b in thelateral direction z, such that the wire 4 is bent around the first wireguide element 3 associated to said joint 2a. Pulling of the joint 2amay be performed by means of, for example, a suitable clamp. Thelink element 1b which is connected via the joint 2b to the end linkelement 1a is now fixed in its position in relation to the latter bymeans of a rod 13 of the interlocking arrangement 12. The nextfurther strut 20 is removed, in order to enable the next pulling ofthe subsequent joint 2a which is not prevented from movement inthe lateral direction. These steps are repeated until the oppositeend link element 1b, with which the straining device 11 isintegrated, is reached. Before pivoting said opposite end linkelement 2b, which is the final step, the clamp 19 of the strainingdevice 11 is tightened to prevent further motion of the wire throughsaid clamp. The second position of the device, shown in fig. 2, is now obtained. 14 Fig. 4 shows an example of a device ready for removal of the bentwire 4. The struts 13 have been removed, and the individual linkelements 1a, 1b can move in relation to each other so as to enable removal of the wire 4.
Claims (11)
1. A device for the production of a wave-shaped bent wire (4), tobe used as stator winding in an electric machine, said devicecomprising: - a plurality of link elements (1a, 1b), each link element (1a, 1b)being hingedly connected at an end thereof to a neighboring linkelement (1a, 1b) through a joint (2a, 2b), - a first wire guide element (3a, 3b) arranged in connection to saidjoint (2a, 2b) and configured to form a support around which a wire(4) is bent, - a holder arrangement (5) configured to hold each second joint(2a, 2b) in a fixed position in a lateral direction (z) while enablingdisplacement of the joint (2a, 2b) in a longitudinal direction (x) of the device, which is perpendicular to said lateral direction (z).
2. A device according to claim 1, characterized in that said firstwire guide element (3a, 3b) comprises a roll which is rotablyarranged and which has a circumferential surface configured to form a support surface for the wire (4) during bending thereof.
3. A device according to claim 2, characterized in that said joint(2a, 2b) comprises a shaft via which neighboring link element (1a,1b) are hingedly connected, and that said roll (6) is coaxial with and supported by said shaft.
4. A device according to any one of claims 1-3, characterized inthat adjacent to each first wire guide element (3a, 3b), there isprovided a second wire guide element (8a) on a first link element (1a, 1b) of a pair of neighboring link element (1a, 1b) and a third 16 wire guide element (8b) on the second link element (1a, 1b) of said pair of neighboring link elements (1a, 1b).
5. A device according to claim 4, characterized in that each of thesecond wire guide element (8a) and the third wire guide element(8b) comprises a roll which is rotably arranged and which has acircumferential surface configured to form a support surface for the wire (4) during bending thereof.
6. A device according to any one of claims 1-5, characterized inthat the link element (1a, 1b) are configured to be positioned in - a first position in which neighboring first wire guide elements (3a,3b) are displaced in relation to each other in said lateral direction(z) such that a straight wire (4) extending in said longitudinaldirection (x) of the device is allowed to extend between each pairof neighboring first wire guide elements (3a, 3b), and - a second position in which each second of said first wire guidesis displaced in a lateral direction (z), through an internal rotationof pairs of neighboring link element (1a, 1b) around theirassociated joint (2a, 2b), such that a straight wire (4) extendingbetween the first wire guide elements (3a, 3b) in said first position is bent to follow a wave-shaped path.
7. A device according to any one of claims 1-6, characterized inthat it comprises - a fixing device (10) configured to fix one end of a wire (4) to bebent to said wave-shape in the device, and - a straining device (11) configured to enable a second end of saidwire (4) to move in said longitudinal direction (x) of the device as a result of a displacement of each second of said first wire guide 17 elements (3a, 3b) in said lateral direction (z), wherein the strainingdevice applies a predetermined counter-force against said movement of the second end of the wire (4). in that it comprises an interlocking arrangement (13) configured to interlock
8. A device according to c|aim 6, characterized the positions of the link element (1a, 1b) when the device is in said second position.
9. A method of producing of a wave-shaped bent wire (4), to beused as stator winding in an electric machine, said methodcomprising the steps of: a) arranging the link element (1a, 1b) of a device according to anyone of claims 1-8 in a first position in which neighboring first wireguide elements (3a, 3b) are displaced in relation to each other insaid lateral direction (z) such that a straight wire (4) extending insaid longitudinal direction (x) of the device is allowed to extendbetween each pair of neighboring first wire guide elements (3a,3b), b) positioning a straight wire (4) such that it extends in saidlongitudinal direction (x) of the device between each pair ofneighboring first wire guide elements (3a, 3b), c) rearranging the device into a second positon by displacing eachsecond of said first wire guide elements (3a, 3b) in a lateraldirection (z), through an internal rotation of pairs of neighboringlink element (1a, 1b) around their associated joint (2a, 2b), suchthat a straight wire (4) extending between the first wire guideelements (3a, 3b) in said first position is bent to follow a wave- shaped path provided for in said second position. 18
10. A method according to claim 9, characterized in that it, priorto step c) it comprises the steps of - fixing one end of the wire (4) to be bent to said wave-shape inthe device, and - applying a counter-force against movement of a second wire end towards the first end as a result of step c).
11. A method according to claim 9 or 10, characterized in that itcomprises the further step of interlocking the positions ofneighboring link element (1a, 1b) after displacement thereof to aposition corresponding to the position they will have in the second position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE1951447A SE543840C2 (en) | 2019-12-12 | 2019-12-12 | A device and a method for the production of a wave-shaped bent wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE1951447A SE543840C2 (en) | 2019-12-12 | 2019-12-12 | A device and a method for the production of a wave-shaped bent wire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| SE1951447A1 SE1951447A1 (en) | 2021-06-13 |
| SE543840C2 true SE543840C2 (en) | 2021-08-10 |
Family
ID=76651909
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE1951447A SE543840C2 (en) | 2019-12-12 | 2019-12-12 | A device and a method for the production of a wave-shaped bent wire |
Country Status (1)
| Country | Link |
|---|---|
| SE (1) | SE543840C2 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100170317A1 (en) * | 2009-01-08 | 2010-07-08 | Aisin Aw Co., Ltd. | Bending apparatus and bending machine |
| FR2968858A1 (en) * | 2010-12-10 | 2012-06-15 | Valeo Equip Electr Moteur | Rotor or stator for e.g. alternator, of motor vehicle, has continuous electric wires that are inserted in each of notches, and provided with set of winding turns that are higher than another set of winding turns and form peripheral path |
| DE102016203167A1 (en) * | 2016-02-29 | 2017-08-31 | Zf Friedrichshafen Ag | Apparatus and method for making a wavy bent wire segment |
| WO2019101272A1 (en) * | 2017-11-22 | 2019-05-31 | Grob-Werke Gmbh & Co. Kg | Unit, device, apparatus and method for bending and producing wave windings for coil windings of electric machines |
-
2019
- 2019-12-12 SE SE1951447A patent/SE543840C2/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100170317A1 (en) * | 2009-01-08 | 2010-07-08 | Aisin Aw Co., Ltd. | Bending apparatus and bending machine |
| FR2968858A1 (en) * | 2010-12-10 | 2012-06-15 | Valeo Equip Electr Moteur | Rotor or stator for e.g. alternator, of motor vehicle, has continuous electric wires that are inserted in each of notches, and provided with set of winding turns that are higher than another set of winding turns and form peripheral path |
| DE102016203167A1 (en) * | 2016-02-29 | 2017-08-31 | Zf Friedrichshafen Ag | Apparatus and method for making a wavy bent wire segment |
| WO2019101272A1 (en) * | 2017-11-22 | 2019-05-31 | Grob-Werke Gmbh & Co. Kg | Unit, device, apparatus and method for bending and producing wave windings for coil windings of electric machines |
Also Published As
| Publication number | Publication date |
|---|---|
| SE1951447A1 (en) | 2021-06-13 |
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