JP2004274878A - Winding method for stator core, and stator core fitted with coil wound by the same method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a winding method which can elevate coil occupancy, using a stator core in the shape of an annulus which is continuous in circumferential direction, and a stator core fitted with a coil wound by the same method. <P>SOLUTION: When winding is carried out, by shifting a winding nozzle 23 so that it moves reciprocatingly around the specified internal tooth 42 of the stator core 40, using a winder which is equipped with a lead wire introduction tube which is arranged coaxially at the center of the stator core 40 and rocks at a specified angle and also reciprocates axially and the winding nozzle 23 which is mounted at the tip of this lead wire introduction tube and veers out the lead wire in a direction perpendicular to the lead wire introduction tube. At this time, the winding nozzles 23 are attached by the portion for the number of slots of the stator core 40 radially to the lead wire inlet tube, and winding is performed simultaneously on corresponding internal teeth 42, while inserting the winding nozzles 23 into all the slots of the stator core at the same time; and winding is performed so that the lead wire may be arranged as far as in the width of a passage, where the winding nozzle is inserted within the slot. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a winding method for a stator core with an increased coil occupancy in a slot of the stator core, and a stator core with a coil wound by the same method.
[0002]
[Prior art]
A winding device that forms a coil by winding directly on the inner teeth of a stator core is generally arranged coaxially at the center of the stator core, swings at a predetermined angle, and reciprocates in the axial direction. A winding nozzle is provided at the tip of the conducting wire introducing cylinder and feeds the conducting wire in a direction substantially perpendicular to the conducting wire introducing cylinder. Then, the winding nozzle tip is turned around the inner teeth of the stator core to be wound by the movement of the conducting wire introduction cylinder, and the coil is formed by directly winding the conducting wire fed from the winding nozzle around the inner teeth. ing.
[0003]
As such a winding device, the one shown in the following Patent Document 1 proposed by the present applicant is known. In this winding device, a head is attached to the leading end of the conducting wire introducing cylinder, the winding nozzle is slidably attached to the head, and a cam follower is attached to the base end of the winding nozzle. A cam plate having a cam groove into which is inserted is rotatably incorporated with respect to the head, and a cam plate rotating means for rotating the cam plate relative to the lead wire introducing cylinder is provided. According to this winding device, by winding while moving the winding nozzle in the radial direction, the conductors can be aligned and wound along the protruding direction of the inner teeth of the stator core. Can be increased.
[0004]
However, in the winding device as described above, the region in which the winding nozzle moves in the radial direction in the slot, that is, the passage width in which the winding nozzle is inserted, interferes with the conductive wire around which the winding nozzle is wound. It was necessary to leave it as a space to avoid it. For this reason, there is a limit to increasing the coil occupancy in the slots of the stator core.
[0005]
On the other hand, as a technique for further increasing the coil occupying ratio in the slots of the stator core, the following Patent Document 2 forms a stator by laminating a plurality of iron cores having slots formed on the inner periphery, and between the slots of the stator. In a rotating electrical machine in which an electric wire is wound, one coil is formed by dividing a stator piece into a plurality of units from a center line of one slot of the stator to a center line of a slot adjacent to the slot. The unit core is integrated into the unit core, and the stator piece in the unit core is connected and integrated at the outer peripheral part of the stator by a thin connecting part. There has been proposed a rotating electric machine characterized by being a child.
[0006]
Further, Patent Literature 3 proposed by the present applicant discloses a winding device for winding a divided stator core as described in Patent Literature 2.
[0007]
According to the techniques described in Patent Documents 2 and 3, after the conductor wires are aligned and wound around the stator pieces of the divided stator core, these stator pieces are combined in a loop shape to form a stator core. Therefore, it is not necessary to leave a space for inserting the winding nozzle, and the coil occupation ratio in the slot can be further increased.
[0008]
[Patent Document 1]
JP 2000-245121 A [Patent Document 2]
JP-A-9-191588 [Patent Document 3]
Japanese Patent Laid-Open No. 2001-8418
[Problems to be solved by the invention]
As described above, in the winding technique described in Patent Document 1, the conductor wire can be aligned and wound along the protruding direction of the inner teeth of the stator core. Therefore, there is a limit to increasing the coil occupancy rate in the slots of the stator core.
[0010]
Further, in the winding technique described in Patent Documents 2 and 3, it is not necessary to leave a space for inserting the winding nozzle by using the divided stator core. Although there is a merit that it can be further increased, there is a problem in that since a joint is formed in the stator core, a magnetic resistance is generated in that portion, and the performance of the motor is lowered.
[0011]
Accordingly, an object of the present invention is to provide a winding method capable of further increasing the coil occupancy rate using a stator core having a continuous annular shape in the circumferential direction, and a stator core with a coil wound by the same method. .
[0012]
[Means for Solving the Problems]
In order to achieve the above object, a winding method for a stator core according to the present invention includes a lead-introducing tube that is coaxially disposed at the center of the stator core, swings at a predetermined angle, and reciprocates in the axial direction, and the lead The winding nozzle is attached to the leading end of the introduction cylinder, and the winding nozzle is provided with a winding nozzle that feeds the conductor in a direction substantially orthogonal to the conductor introduction cylinder. In the winding method to the stator core that is wound so as to move around the winding, the winding nozzles are radially attached to the conducting wire introduction tube by the number of slots of the stator core, and the winding nozzles are mounted on the stator core. Winding is simultaneously performed on the corresponding internal teeth while being simultaneously inserted into all the slots, and the conductor is disposed within the passage width into which the winding nozzle is inserted in the slot. And characterized by applying urchin winding.
[0013]
According to the winding method described above, it is necessary to wind the adjacent inner teeth again by simultaneously winding the corresponding inner teeth while simultaneously inserting the winding nozzles into all slots of the stator core. Therefore, even if winding was performed so that the conductive wire was placed within the width of the passage where the winding nozzle was inserted, it was wound by winding it out of the slot while retracting the winding nozzle as it was The winding nozzle can be wound within the passage width of the winding nozzle without the winding nozzle interfering with the conductor. As a result, the coil occupancy can be further increased by using a stator core having an annular shape that is continuous in the circumferential direction, so that a compact and high-performance motor can be manufactured.
[0014]
In the winding method of the present invention, winding is performed while reciprocating the winding nozzle along the protruding direction of the internal teeth until just before the conducting wire enters the passage width, and the conducting wire passes through the passage. After winding until just before entering the width, it is preferable to perform winding sequentially from the back of the slot so that the conducting wire is arranged within the passage width.
[0015]
According to this aspect, the winding nozzle is neatly arranged in the state in which the conducting wire is aligned along the protruding direction of the inner teeth and within the passage width of the winding nozzle without contacting the wound conducting wire. It can be laminated and wound, and the coil occupancy in the slots of the stator core can be maximized.
[0016]
The winding method of the present invention is preferably applied to a stator core having 12 or more slots.
[0017]
In the stator core having 12 or more slots, in the conventional winding method, the dead space for securing the passage width of the winding nozzle is increased by the number of slots. If the method is applied, the coil can be wound in the dead space, so that the coil occupancy can be more effectively increased even in a multi-slot core. Furthermore, in motors for electric vehicles, etc., the current may flow in parallel through coils wound around a plurality of internal teeth to increase the output, but the current can flow in parallel as the number of slots in the stator core increases. Since the number of coils increases, the output can be further increased.
[0018]
On the other hand, the stator core with a coil of the present invention is a stator core with a coil obtained by winding by any one of the above methods, and the stator core has a continuous annular shape in the circumferential direction, and the winding of the slot The wire is wound so that the conductive wire is also disposed within the passage width of the nozzle.
[0019]
According to the stator core with a coil, since it is a stator core having an annular shape that is continuous in the circumferential direction, there is no joint like the divided stator core, and there is no problem that the magnetic resistance increases at the joint and the performance deteriorates. In addition, since the conductor is wound so as to be disposed within the passage width of the winding nozzle of the winding of the stator core slot, the coil occupancy in the slot can be increased, and a compact and high-performance motor can be made. Is possible.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
1 to 10 show an embodiment of a winding method for a stator core according to the present invention and a stator core with a coil wound by the same method. 1 is an enlarged cross-sectional view of a main part showing the vicinity of a winding nozzle of a winding device used in the winding method, FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1, and FIG. FIG. 4 is a cross-sectional view showing a state where the stator core is installed in the winding device, FIG. 5 is a partially enlarged cross-sectional view showing a state where winding is started on the inner teeth of the stator core, FIG. 6 is a partially enlarged cross-sectional view showing a state in which winding is performed while reciprocating the winding nozzle along the protruding direction of the inner teeth of the stator core, and FIG. FIG. 8 is a partially enlarged sectional view showing an example of the winding sequence with respect to the inner teeth of the stator core, and FIG. 9 is a transverse sectional view showing the winding finished state. 10 is a stator core with a coil according to the present invention obtained by the winding method Is a plan view showing an embodiment.
[0021]
1 and 2 show an example of a winding device used in the winding method of the present invention. The winding device 11 has a conductor introduction tube 12 that is coaxially arranged at the center of the stator core and into which a conductor is introduced from the lower end. An outer cylinder 13 is attached to the outer periphery of the conducting wire introducing cylinder 12. The conducting wire introducing cylinder 12 and the outer cylinder 13 are inserted through a bearing 14.
[0022]
Then, the lead wire introduction cylinder 12 swings (reciprocates) within a predetermined angle range as shown by an arrow A in FIG. 2 via a drive mechanism (not shown), and as shown by an arrow B in FIG. Reciprocates in the axial direction.
[0023]
Further, the outer cylinder 13 swings together with the conductor introduction cylinder 12 and moves in the axial direction, and further swings at a predetermined angle with respect to the conductor introduction cylinder 12 via a drive mechanism (not shown). It is supposed to be.
[0024]
A stepped cylindrical member 15 whose upper inner / outer diameter is reduced compared to the lower inner / outer diameter is covered at the upper end of the conducting wire introducing cylinder 12, and the stepped cylindrical member 15 is attached to the upper end portion of the conducting wire introducing cylinder 12 by a screw 18. It is fixed to the outer periphery. A guide ring 15 a having a curved inner surface is disposed on the upper inner periphery of the stepped cylindrical member 15, and a conductive wire led out from the upper end of the conductive wire introducing cylinder 12 is allowed to pass through. 31 is led.
[0025]
An annular cam plate 21 is rotatably mounted on the outer periphery of the reduced diameter portion at the top of the stepped cylindrical member 15. The head main body 16 is disposed on the cam plate 21. The head body 16 is fixed to the stepped cylindrical member 15. The cam plate 21 is sandwiched and held between the enlarged diameter step portion of the stepped cylindrical member 15 and the head main body 16 and can be rotated with respect to the stepped cylindrical member 15 and the head main body 16. Yes. The head body 16, the stepped cylindrical member 15, and the cam plate 21 constitute the head 17 in the present invention.
[0026]
A total of 18 radial guide grooves 22 that extend radially outward at an equal angle from the center are formed on the lower surface of the head body 16. The bases of the winding nozzles 23 are respectively inserted into the guide grooves 22 and are held so as to be movable in the radial direction as indicated by an arrow C in FIG.
[0027]
On the other hand, a spiral cam groove 24 is formed on the upper surface of the cam plate 21 corresponding to each guide groove 22. A cam follower 26 attached to the lower surface of the winding nozzle 23 via a support shaft 25 is inserted into the spiral cam groove 24. As a result, when the cam plate 21 is rotated relative to the head body 16 by a drive mechanism (not shown), the cam follower 26 moves along the cam groove 24, and the winding nozzle 23 moves along the guide groove 22. As shown by an arrow C in FIG.
[0028]
Further, an enlarged diameter portion 13 a is formed at the upper end portion of the outer cylinder 13. The lower portion of the stepped cylindrical member 15 is inserted into the inner periphery of the enlarged diameter portion 13a, and the cam plate 21 is fixed to the enlarged diameter portion 13a by a bolt 27. The stepped cylindrical member 15 is held such that the expanded lower portion is rotatable between the outer cylinder 13 and the cam plate 21.
[0029]
The outer cylinder 13 is rotated and axially moved together with the conductor introduction cylinder 12 by a drive mechanism (not shown), and is rotated relative to the conductor introduction cylinder 12 in that state. As a result, the cam plate 21 rotates relative to the head body 16. That is, the cam plate 21 rotates together with the head main body 16 and also rotates relative to the head main body 16 in the course of the winding operation. As a result, as described above, the winding nozzle 23 can be moved in and out in the radial direction via the cam follower 26 inserted into the cam groove 24.
[0030]
In this winding device 11, the conductive introduction cylinder 12 swings (reciprocates) at a predetermined angle as shown by an arrow A in FIG. 2 by a drive mechanism (not shown) and is shown by an arrow B in FIG. Thus, by reciprocating in the axial direction, each winding nozzle 23 attached to the upper end portion of the conducting wire introducing cylinder 12 via the head 17 circulates around the corresponding internal teeth of the stator core.
[0031]
Then, after the lead wire is introduced from the lower end of the lead wire introduction tube 12 and led out from the upper end, the path is changed by the annular guide 15a of the stepped cylindrical member 15 and passes through the lead wire guide hole 31 of the winding nozzle 23, and the nozzle It is drawn out from the tip of 24 and wound around the inner teeth of the stator core.
[0032]
In parallel with the winding operation, the outer cylinder 13 rotates relative to the lead wire introducing cylinder 12, and the cam plate 21 connected to the outer cylinder 13 rotates reciprocally relative to the head body 16. To do. As a result, the winding nozzle 23 moves in and out in the radial direction as shown by an arrow C in FIG. 2 via the cam follower 26 fitted in the cam groove 24 of the cam plate 21, and in the protruding direction of the internal teeth of the stator core. The conductors can be wound in multiple layers along the line.
[0033]
As a drive mechanism for swinging the lead wire introduction cylinder 12 indicated by arrows A and B in the drawing and reciprocating in the axial direction, for example, a drive mechanism for a winding device disclosed in Japanese Patent No. 2813556 is adopted. can do.
[0034]
Further, as a drive mechanism for the cam plate 21 provided continuously with the outer cylinder 13, for example, a drive mechanism for a winding device disclosed in Japanese Patent Application Laid-Open No. 2000-245121 (Patent Document 2) can be employed.
[0035]
FIG. 3 shows an example of a stator core to which the winding method of the present invention is applied. The stator core 40 is formed by, for example, forming a thin silicon steel plate and laminating a plurality of sheets, and has an annular main body 41 and a plurality of internal teeth 42 protruding on the inner periphery of the main body 41. A slot 43 is formed between the inner teeth 42. In this example, 18 internal teeth 42 and 18 slots 43 are formed. A slot liner 44 made of an insulating material such as a resin molded product is mounted on the inner periphery of the slot 43 in advance. The stator core 40 is not different from a conventionally employed stator core, but the above-described Patent Document 2 is that the annular main body 41 is not divided in the circumferential direction and is integrally formed without a joint. , 3 is different from the stator core described in FIG.
[0036]
FIG. 4 shows a state in which the head 17 of the winding device 11 is inserted into the stator core 40. By the above-described operation, the winding nozzle 23 of the winding device 11 is inserted into the slot 43 through the gap between the inner teeth 42 of the stator core 40 and operates so as to wrap around the corresponding inner teeth 42 and wind the conductive wire. . In this case, the winding nozzles 23 are attached by the number of slots 43, and the winding nozzles 23 are simultaneously inserted into all the slots 43 of the stator core 40 while simultaneously winding the corresponding inner teeth 42. It has become.
[0037]
FIG. 5 shows a state in which the winding is started with respect to the inner teeth 42 of the stator core 40 in this way. The winding nozzle 23 of the winding device 11 moves so as to go around the corresponding inner tooth 42, and winds the conductive wire 50 around the inner tooth 42. The conducting wire 50 is accommodated in the slots 43 on both sides of the internal tooth 42. The winding nozzle 23 moves in the protruding direction of the internal teeth 42 as indicated by an arrow C, and gradually changes the winding position, thereby aligning and winding the conducting wire 50. In the figure, W represents the width of the passage into which the winding nozzle 23 is inserted.
[0038]
FIG. 6 shows a state in which the winding is performed while reciprocating the winding nozzle 23 along the protruding direction of the inner teeth 42 of the stator core 40. Until the conducting wire 50 enters the passage width W of the winding nozzle 23, the winding nozzle 23 is wound while reciprocating in the radial direction along the protruding direction on the inner teeth 42. As a result, the conductive wires 50 are wound while being arranged in a line, and when they reach the vicinity of the end of the inner teeth 42, they are folded back and wound in multiple layers. Winding sequences 1 to 19 in FIG. 8 indicate a state in which the winding nozzle 23 is wound while being reciprocated along the protruding direction of the inner teeth 42.
[0039]
Thus, after conducting the winding until the conductors 50 stacked in multiple layers are just before entering the passage width W of the winding nozzle 23, the conductors 50 are arranged in two stages as shown in the winding sequence 20 to 35 in FIG. The windings are sequentially applied from the back of the slot 43 while overlapping in a shape. In this way, the winding is performed from the back of the slot 43 because the wound conductors 50 overlap so that the wound conductor wire 50 enters the passage width W. Therefore, the winding nozzle 23 cannot be inserted into the back of the slot 43 again. This is because it disappears.
[0040]
FIG. 7 shows the winding end state where the winding is sequentially performed from the back of the slot 43 and reaches the opening of the slot 43 so that the conductor 50 enters the passage width W of the winding nozzle 23 as described above. (State of winding sequence 35 in FIG. 8). FIG. 9 shows a cross-sectional view in the winding end state.
[0041]
In this way, the winding nozzles 23 are attached in the number of the slots 43, and the winding nozzles 23 are simultaneously inserted into all the slots 43 of the stator core 40 while simultaneously winding the corresponding internal teeth 42. It is possible to perform winding so that the conductor 50 is disposed up to the passage width W of the winding nozzle 23 of 43, whereby the coil occupancy (space factor) in the slot 43 can be further increased.
[0042]
FIG. 10 shows an embodiment of a stator core with a coil of the present invention obtained by winding by the method as described above.
[0043]
In this stator core with coils, the conductive wire 50 is wound around the inner teeth 42 of the stator core 40 by the winding method as described above, and coils of U phase, V phase, and W phase are formed. In the figure, U1 to U6 indicate U-phase coils, V1 to V6 indicate V-phase coils, and W1 to W6 indicate W-phase coils.
[0044]
In FIG. 10, only the U-phase lead wire is shown for convenience, but two lead wires composed of a winding start end portion and a winding end end portion are drawn out from each coil. In this embodiment, six U-phase, V-phase, and W-phase lead wires are connected in parallel. For example, in the case of the U phase, lead wires La1 to La6 composed of winding start ends of the coils U1 to U6 are collected and connected, and lead wires Lb1 to Lb6 composed of winding end portions are collected and connected. By para-connecting in this way, for example, by passing a current in parallel to the coils U1 to U6, it is possible to increase the current value and increase the output even when the drive voltage is low, which is suitable as an electric vehicle motor or the like. Become.
[0045]
That is, in an electric vehicle, for example, it is necessary to increase a current value in order to generate a large output from a low-voltage battery such as 12 V, and as a result, it is necessary to reduce an electric resistance as much as possible. However, when a thick conducting wire is used, winding around the stator core becomes difficult, and the thickness of the conducting wire is limited. Therefore, a method of winding a plurality of conducting wires in parallel has been proposed. However, the para-winding method of winding a plurality of conductive wires in parallel has a problem that it is difficult to align the conductive wires and it is difficult to increase the coil occupancy in the slot.
[0046]
On the other hand, as shown in FIG. 10, in the method of passing the current in parallel through a plurality of coils by para-connection, the windings for the individual internal teeth 42 may be performed by one conducting wire 50. The conductors 50 can be easily aligned, the coil occupancy in the slot 43 can be easily increased as described above, and a compact and high-performance motor can be manufactured. Although there is a demerit that the work man-hours increase by the amount that must be para-wired, in motors such as electric vehicles, it is possible to make a compact and high performance motor with higher coil occupancy than such demerits The merit is considered highly appreciated.
[0047]
As described above, the winding method of the present invention is preferably applied to a stator core having 12 or more slots. According to this, as described above, the number of coils can be increased in the case of parallel connection for each of the U, V, and W coils so that the current flows in parallel. To increase the output.
[0048]
【The invention's effect】
As described above, according to the winding method of the present invention, the winding nozzle is inserted into all slots of the stator core at the same time while simultaneously winding the corresponding inner teeth. Therefore, even if winding is performed so that the conductive wire is disposed within the width of the passage where the winding nozzle is inserted, the winding nozzle is retracted and wound from the slot. By exiting, the winding nozzle can be wound within the passage width of the winding nozzle without interfering with the wound conducting wire.
[0049]
The coiled stator core of the present invention obtained by the above winding method is a circumferentially continuous stator core, so there is no joint like the divided stator core, and the magnetic flux leaks from the joint and the performance deteriorates. The coil is wound so that the conductor wire is also arranged within the passage width of the winding nozzle of the slot of the stator core, so that the coil occupancy in the slot can be increased, and the performance is compact. It becomes possible to make a high motor.
[Brief description of the drawings]
FIG. 1 is an enlarged sectional view of an essential part showing the vicinity of a winding nozzle of a winding apparatus used in a winding method of the present invention.
2 is a cross-sectional view taken along the line II-II in FIG.
FIG. 3 is a plan view of a stator core applied to the winding method.
FIG. 4 is a transverse sectional view showing a state in which a stator core is installed in the winding device.
FIG. 5 is a partially enlarged cross-sectional view showing a state where winding is started on the inner teeth of the stator core.
FIG. 6 is a partially enlarged cross-sectional view showing a state where winding is performed while reciprocating a winding nozzle along the protruding direction of the inner teeth of the stator core.
FIG. 7 is a partially enlarged cross-sectional view showing a state in which the winding is performed so that the conducting wire is arranged within the passage width of the winding nozzle.
FIG. 8 is a partially enlarged cross-sectional view showing an example of the winding sequence with respect to the internal teeth of the stator core.
FIG. 9 is a cross-sectional view showing a winding end state.
FIG. 10 is a plan view showing an embodiment of a stator core with a coil according to the present invention obtained by the winding method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Winding apparatus 12 Conductor introduction cylinder 15 Stepped cylindrical member 16 Head main body 17 Head 21 Cam plate 22 Guide groove 23 Winding nozzle 24 Cam groove 26 Cam follower 31 Conductor guide hole 40 Stator core 41 Main body part 42 Internal tooth 43 Slot 44 Slot liner 50 Conductor U1-U6 U-phase coil V1-V6 V-phase coil W1-W2 W-phase coil

Claims (4)

Coaxially arranged at the center of the stator core, swings at a predetermined angle, and reciprocates in the axial direction, and is installed at the tip of the conductor introduction cylinder, and the conductor is substantially orthogonal to the conductor introduction cylinder. In a winding method to a stator core that performs winding by moving the winding nozzle so as to go around a predetermined inner tooth of the stator core, using a winding device including a winding nozzle that is fed out in a direction to perform, The winding nozzles are radially attached to the lead-introducing cylinder by the number of slots of the stator core, and the winding nozzles are simultaneously inserted into all the slots of the stator core while simultaneously winding the corresponding inner teeth. A winding method for a stator core, wherein the winding is performed so that the conductive wire is disposed within a width of a passage into which the winding nozzle is inserted in the slot. Winding is performed while reciprocating the winding nozzle along the protruding direction of the internal teeth until just before the conducting wire enters the passage width, and winding is carried out until just before the conducting wire enters the passage width. The winding method to the stator core according to claim 1, wherein the winding is sequentially performed from the back of the slot so that the conductive wire is disposed within the passage width. The winding method to a stator core according to claim 1 or 2, which is applied to a stator core having 12 or more slots. It is a stator core with a coil obtained by winding by the method in any one of Claims 1-3, Comprising: The said stator core has comprised the cyclic | annular form which continued in the circumferential direction, The inside of the channel width of the said winding nozzle of the said slot Further, the stator core with a coil is wound so that a conducting wire is disposed on the stator core.

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