JP2015061370A - Stator, and manufacturing method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator, which is a spirally wound stator not only reduced in insertion resistance occurring when its coil is inserted but also smoothed in the variation of the poles of its rotating magnetic field, and a manufacturing method for the stator.SOLUTION: By a stator manufacturing method to simultaneously insert coils set on the blade of a coil insertion jig in an overall shape of spirally overlapping one another into corresponding slots 32 of a stator core 30 and to insert an insulating sheet into the slot aperture side through a wedge guide, a coil to be inserted into one slot is divided into two pieces, first a coil C1 to be arranged on the outer circumferential side of the slot is inserted, then the inserted coil C1 and an insulating sheet 34 are pressed against the outer circumferential side of the slot and shifted to perform intermediate molding, and further a coil C2 to be arranged on the inner circumferential side of the slot is inserted, so arranged as to deviate by one slot in a circumferential direction relative to the coil C1 arranged on the outer circumferential side of the slot.

Description

  The present invention relates to a stator used for a motor, a generator, and the like, and a manufacturing method thereof.

  There is known a stator (hereinafter referred to as “spiral winding stator”) in which coils are spirally overlapped when viewed from an end face of a stator core. Such a helically wound stator has a short coil end, a relatively uniform and compact shape, a small torque unevenness when used as a motor, and an excellent motor vibration and noise. It has the characteristics.

  In Patent Document 1 below, in order to manufacture such a spirally wound stator, a predetermined gap between the blades of a coil insertion jig having a plurality of blades arranged in an annular shape corresponding to the inner teeth of the stator core, One side of the coil is under the adjacent coil and enters the predetermined gap, and the other side of the coil is over the adjacent coil on the opposite side and enters the predetermined gap, and is set in a state where the entire coil overlaps spirally. A coil winding / setting method and a coil winding / setting apparatus are disclosed.

  On the other hand, there are concentrated windings in which windings are wound around adjacent slots and magnetic poles are formed for each coil, and distributed windings in which windings are wound across several slots and magnetic poles are formed by a plurality of coils. . In the distributed winding, there are a full-pitch winding in which the magnetic pole pitch and the coil pitch coincide, and a short-pitch winding in which the coil pitch is shorter than the magnetic pole pitch.

  In addition, there are single layer windings in which only one coil side is accommodated in one slot, and two layer windings in which two coil sides are accommodated in one slot. Further, the two-layer winding includes an in-phase winding in which a coil side of the same phase is inserted into one slot and a different phase winding in which a coil side of another phase is inserted. And the short phase winding two-layer different phase winding has an advantage that the rotation is smoother than the same phase winding.

WO2012 / 153844

  In Patent Document 1, one side of a coil is below an adjacent coil in a predetermined gap of the blade of a coil insertion jig having a plurality of blades arranged in an annular shape corresponding to the inner teeth of a stator core. A method is disclosed in which a predetermined gap is entered and the other side of the coil overlaps with a coil adjacent to the opposite side of the coil and enters the predetermined gap, and the entire coil is spirally overlapped. When inserting the formed coils into the slots of the stator core, it was necessary to simultaneously insert the spirally stacked coils into all the slots.

  For this reason, all the blades of the coil insertion jig need to be fixed blades, and the frictional resistance between the blade and the coil is increased as compared with the case of normal coil insertion using a movable blade. Since the coil is inserted into the slot at the same time, there is a problem that the insertion resistance becomes more and more difficult to insert.

  In addition, the short-phase winding two-phase winding has an advantage that the rotation is smoother than the same-phase winding, but the coil side inserted on the outer diameter side and the coil inserted on the inner diameter side are different in phase, It was necessary to insert interphase insulating paper.

  For this reason, when trying to make two-phase short-winding winding with different phases, it is difficult to mechanically insert with a coil insertion device, and it is necessary to insert it manually. In addition, no attempt has been made so far to make a spirally stacked coil into a two-phase short-winding winding.

  Accordingly, an object of the present invention is a helically wound stator, which can reduce the insertion resistance when inserting a coil, and can mechanically manufacture two-phase short-winding windings. A stator and a manufacturing method thereof are provided.

To achieve the above object, the stator of the present invention is a stator in which coils are inserted into slots so that the coils are spirally overlapped when viewed from the end face of the stator core.
The coil inserted into one slot is divided into two, inserted into the outer diameter side and the inner diameter side of the slot, and the spirally overlapped coil is inserted in two layers inside and outside,
Among the coils of the same phase forming the same pole, the one inserted on the outer diameter side of the slot and the one inserted on the inner diameter side of the slot are inserted shifted by one slot in the circumferential direction,
An insulating sheet is disposed between an outer diameter side coil and an inner diameter side coil inserted into one slot.

The stator manufacturing method of the present invention also includes a coil insertion treatment having a plurality of blades arranged in an annular shape corresponding to the inner teeth of the stator core and a plurality of wedge guides arranged outside each blade. In the predetermined gap of the blade of the tool, one side of the coil is under the adjacent coil and enters the predetermined gap, and the other side of the coil overlaps the adjacent coil on the opposite side and enters the predetermined gap as a whole. In the method of manufacturing a stator, the coils set in a spirally overlapping state are simultaneously inserted into the corresponding slots of the stator core, and the insulating sheet is inserted into the slot opening side through the wedge guide.
The coil to be inserted into one slot is divided into two, and first the coil arranged on the outer diameter side of the slot is inserted by the above method, and the insulating sheet is inserted into the slot opening side,
Next, intermediate molding is performed in which the inserted coil and insulating sheet are pressed against the outer diameter side of the slot and moved,
Further, the coil arranged on the inner diameter side of the slot is arranged so as to be shifted by one slot in the circumferential direction with respect to the coil arranged on the outer diameter side, and is inserted by the above method, and the insulating sheet is opened in the slot. By inserting on the side,
Of the same-phase coils forming the same pole, those inserted on the outer diameter side of the slot and those inserted on the inner diameter side of the slot are inserted shifted by one slot in the circumferential direction and inserted into one slot. A stator in which an insulating sheet is disposed between an outer diameter side coil and an inner diameter side coil is obtained.

  According to the present invention, the coil to be inserted into one slot is divided into two and inserted into the outer diameter side and the inner diameter side of the slot, and the spirally overlapped coils are inserted in two layers inside and outside. Since it was made to do, even if it is a spiral winding stator which needs to insert the coil piled up helically into all the slots simultaneously, the insertion resistance at the time of inserting a coil can be decreased.

  Also, after first inserting the coil arranged on the outer diameter side of the slot, intermediate molding is performed, and then the coil arranged on the inner diameter side of the slot is circumferentially arranged with respect to the coil arranged on the outer diameter side. By arranging and inserting the slots so as to be shifted by one slot in the direction, the coils of the same phase forming the same pole are inserted into the outer diameter side of the slot and those inserted into the inner diameter side of the slot. Since it can be in the form of a so-called short-pitch winding that is shifted by one slot in the direction, a stator in which the magnetic field of the rotating magnetic field changes smoothly can be obtained.

  In addition, by repeating the coil insertion operation twice, an insulating sheet (wedge) is inserted through the wedge guide to the opening side of the slot each time. Insulation can be ensured even when a coil having a different phase is inserted into one slot.

The 1st process of the manufacturing method of the stator by one embodiment of the present invention is shown, (a) is a top view and (b) is a longitudinal section. It is a longitudinal cross-sectional view which shows the 2nd process of the manufacturing method of the same stator. The 3rd process of the manufacturing method of the stator is shown, (a) is a top view and (b) is a longitudinal section. It is a top view which shows the 4th process of the manufacturing method of the same stator. It is a longitudinal cross-sectional view which shows the 5th process of the manufacturing method of the same stator. It is a longitudinal cross-sectional view which shows the 6th process of the manufacturing method of the same stator. It is a longitudinal cross-sectional view which shows the 7th process of the manufacturing method of the stator. It is a longitudinal cross-sectional view which shows the 8th process of the manufacturing method of the same stator. It is a longitudinal cross-sectional view which shows the 9th process of the manufacturing method of the same stator. It is explanatory drawing which shows the 10th process of the manufacturing method of the same stator. It is explanatory drawing which shows the 11th process of the manufacturing method of the same stator. It is explanatory drawing which shows the 12th process of the manufacturing method of the same stator. It is explanatory drawing which shows the 13th process of the manufacturing method of the same stator. It is a longitudinal cross-sectional view which shows the 14th process of the manufacturing method of the same stator. It is a longitudinal cross-sectional view which shows the 15th process of the manufacturing method of the same stator. It is a longitudinal cross-sectional view which shows the 16th process of the manufacturing method of the same stator. It is a longitudinal cross-sectional view which shows the 17th process of the manufacturing method of the same stator. It is a longitudinal cross-sectional view which shows the 18th process of the manufacturing method of the same stator. It is a longitudinal cross-sectional view which shows the 19th process of the manufacturing method of the same stator. The stripper used for the manufacturing method of the same stator is shown, (a) is a top view and (b) is a longitudinal section. The state in the slot of the coil inserted by the manufacturing method of the stator is shown, (a) is an explanatory view in a state where an outer coil is inserted, (b) is an explanatory surface in a state where intermediate molding is performed, and (c) is an inner side. It is explanatory drawing of the state which inserted the coil. It is the schematic diagram which looked at the coil end of the stator by one Embodiment of this invention manufactured with the manufacturing method of the stator planarly. It is explanatory drawing which shows the insertion state of the coil of the stator.

  Hereinafter, an embodiment of a stator and a manufacturing method thereof according to the present invention will be described with reference to the drawings. First, a schematic structure of a coil insertion device used in the manufacturing method will be described.

  FIG. 1 shows a state in which the stripper 20 is arranged on the coil insertion jig 10 and the outer coil C1 is set. The coil insertion jig 10 has a cylindrical holder 11, and an index gear member 12 is mounted on the outer periphery thereof. A base portion of the wedge guide 13 is fixed to the inner periphery of the holder 11. Further, a blade 14 is disposed on the inner periphery of the wedge guide 13, and the blades 14 are all fixed blades, and their base portions are fixed to a cylindrical blade holder 15 disposed inside the holder 11. Has been.

  As shown in FIG. 23, the stator core 30 has a plurality of teeth 31 on its inner periphery, and a slot 32 into which a coil is inserted is formed between the teeth 31. The blades 14 are fitted into the inner end surfaces of the teeth 31 and arranged in an annular shape. As shown in FIG. 3, with the stator core 30 set, the leading end of the blade 14 extends from the upper end surface of the stator core 30. The length is slightly protruding.

  The wedge guide 13 has a length such that when the stator core 30 is mounted, the upper end of the wedge guide 13 reaches the lower end surface of the stator core 30 (see FIG. 3). In addition, the wedge guide 13 is disposed on the outer periphery of the blade 14, and a space between the wedge guides 13 serves as a path for the insulating sheet (wedge). As shown in FIG. 21, the insulating sheet (wedge) is composed of a first insulating sheet 34 and a second insulating sheet 35, both of which are bent in a U shape when viewed from the axial direction. A wedge pusher (not shown) is inserted into the slot 32 so as to close the opening of the slot 32. A slot insulating sheet 33 is inserted in advance on the inner periphery of the slot 32.

  As shown in FIG. 20, the stripper 20 has a columnar shape as a whole, and has a plurality of teeth 21 inserted into the gap of the blade 14 on the outer periphery. On the lower surface of the stripper 20, a recess 23 is formed in which a coupling in which the tip of the drive shaft 22 shown in FIG. The protruding length of the teeth 21 of the stripper 20 is set so as to be inserted slightly inward from the opening of the slot 32 of the stator core 30.

  As shown in FIG. 1, a columnar spacer 24 is attached to the upper surface of the stripper 20. The spacer 24 has an outer diameter that allows a predetermined gap to be formed between the inner periphery of the blade 14. As shown in FIGS. 3 and 14, the gap is a portion into which the inside of the loop of the outer coil C1 and the inner coil C2 hooked on the blade 13 is inserted.

  As shown in FIG. 2, a core guide 50 is installed on the blade 14. The core guide 50 includes a main body portion 51 and an introduction portion 52. The main body 50 has teeth 55 inserted in the gap between the teeth 31 (see FIGS. 21 and 23) of the stator core 30 and the gap between the blades 14 on the outer periphery. The introduction part 52 has teeth 56 that are inserted into the gaps of the teeth 31 of the stator core 30 on the outer periphery.

  The introduction part 52 is fixed to the upper surface of the main body part 51 by a bolt (not shown). A support shaft 54 is attached to the center of the upper surface of the introduction portion 52, and a coupling 53 that moves in the vertical direction is detachably connected to the outer periphery of the support shaft 54 by a driving device (not shown), so that the core guide 50 is attached. It can be installed at the upper end of the blade 14 or removed from the upper end of the blade 14.

  When the stator core 30 is installed on the upper portion of the blade 14, the core guide 50 is installed on the upper portion of the blade 14, so that the teeth 56 of the introduction portion 52 enter the gap between the teeth 31 of the stator core 30, and the main body portion 50. Thus, the inner end surface of the teeth 31 of the stator core 30 is fitted to the blade 14 and the stator core 30 is mounted on the outer periphery of the upper end portion of the blade 14 (see FIG. 3).

  As shown in FIGS. 2 and 3, the stator core 30 is held by a pallet-shaped core holder 60 and is detachably mounted on the blade 14. The core holder 60 includes a seat plate 61, a top plate 62, and a spacer ring 63. The stator core 30 is sandwiched and held between the seat plate 61 and the top plate 62. The seat plate 61 and the top plate 62 are provided with a plurality of cuffs 64 that slide in a radially movable manner from the outer diameter direction toward the inner diameter direction so as to contact the upper and lower end surfaces of the teeth 31 of the stator core 30. ing. Each cuff 64 contacts the upper and lower end surfaces of the corresponding tooth 31 and supports the cuffs (folded collar portions) of the slot insulating sheet 33 (see FIG. 21) protruding from the upper and lower end surfaces of the stator core 30 so as not to be crushed. In the figure, reference numeral 65 denotes an operation bar for moving the cuffs 64 forward and backward. Since this device is a prototype, the cuffs 64 are moved back and forth with the operation rod 65, but in actuality, they are automatically moved back and forth using a cam mechanism. Since such a structure is a known structure disclosed in, for example, Japanese Patent Laid-Open No. 7-222411, a detailed description thereof will be omitted.

  Furthermore, the coil insertion device used in the present invention includes an intermediate forming device 40 shown in FIGS. The intermediate molding device 40 includes a lower molding die 41 and an upper molding die 42 that are moved up and down independently by a driving mechanism (not shown).

  The lower molding die 41 has a cylindrical shape as a whole, and has a tapered upper end portion 43 and a pressing blade portion formed on the lower peripheral wall thereof at a predetermined interval along the circumferential direction and at a predetermined length along the axial direction. 44. As shown in FIG. 21, the pushing blade portion 44 is inserted into the slot 32 of the stator core 30 and serves to push the first insulating sheet 34 into the back of the slot 32. The upper end portion of the pushing blade portion 44 has a tapered shape that gradually increases downward.

  The upper molding die 42 has a cylindrical shape with an inner diameter into which the lower molding die 41 can be inserted. A guide groove 45 into which the pushing blade 44 of the lower molding die 41 is inserted is formed on the inner periphery, and the outer periphery of the lower end portion. Is formed with a coil end forming portion 46 that is reduced in the shape of a concave curved surface downward.

  Next, an embodiment of a stator manufacturing method according to the present invention using the coil insertion device will be described.

  As shown in FIG. 1, the coil insertion jig 10 is provided with a stripper 20 and a spacer 24. Then, for example, by the method disclosed in Patent Document 1 (WO2012 / 153844), one side of the coil falls under the adjacent coil into the predetermined gap of the blade 14 of the coil insertion jig 10 and enters the predetermined gap. The outer coil C1 is set in a state where the other side of the coil overlaps with the coil adjacent to the opposite side of the coil and enters a predetermined gap and overlaps spirally as a whole. For example, in the case of a three-phase induction motor, coils in each phase of U, V, and W are arranged in the circumferential direction so that they repeat in order, one side of U falls under W, the other side rests on V, and V One side of the phase is under the U phase, the other side is on the W phase, one side of the W phase is under the V phase, and the other side of the W phase is on the U phase In a state where the blades 14 overlap each other, the blades 14 are set with both sides held in a predetermined gap. Since this coil setting method and apparatus are described in detail in the above-mentioned Patent Document 1, description thereof will be omitted. The inner side of the blade 14 of the loop of the outer coil C <b> 1 is placed in the gap between the spacer 24 and the blade 14 and placed on the stripper 20.

  Next, as shown in FIG. 2, the core guide 50 is moved above the blade 14 via a support shaft 54 held by a coupling 53 that is moved by a driving device (not shown), and is installed on the blade 14. When the core guide 50 is installed on the blade 14, the coupling 53 is removed from the support shaft 54 and waits upward, and the core holder 60 holding the stator core 30 is disposed above the blade 14.

  Then, as shown in FIG. 3, the core holder 60 is lowered and the stator core 30 is mounted on the outer periphery of the blade 14 while being guided by the core guide 50. At this time, the tip of the blade 14 protrudes slightly from the upper end surface of the stator core 30.

  In this state, as shown in FIG. 4, the drive shaft 22 is raised and connected to the coupling disposed in the recess 23 of the second stripper 30, and the stripper 20 and the spacer 24 are raised. As a result, the outer coil C1 is pushed up by the stripper 20, and the outer coil C1 is inserted into the corresponding slot 32 of the stator core 30 by the teeth 21 of the stripper 20 (see FIG. 20). At this time, the coil guide 66 disposed on the lower surface of the stator core 30 smoothly introduces the first coil C1 into the slot 32, so that resistance at the insertion portion can be reduced and damage to the coil can be reduced. As described above, all the blades 14 are fixed blades, and the outer coils C1 are inserted into all the slots 32 at the same time while being spirally overlapped.

  As shown in FIG. 5, when the stripper 20 is raised to the maximum position, both sides of the outer coil C1 hooked on the blade 14 are completely inserted into the predetermined slots 32 of the stator core 30, and above the outer coil C1. This loop is removed from the upper end of the blade 14 and becomes a coil end protruding from the upper end surface of the stator core 30.

  Thus, when the insertion of the outer coil C1 is completed, the core guide 50 is removed and moved to a predetermined position via the coupling 53 and the support shaft 54 by a driving device (not shown) as shown in FIGS. . Further, as shown in FIG. 8, the stripper 20 descends and returns to the initial position.

  In this state, as shown in FIG. 9, the core holder 60 is removed from the blade 14 and moved between the lower mold 41 and the upper mold 42 of the intermediate molding apparatus 40.

  Next, as shown in FIG. 10, the lower mold 41 is raised and inserted into the inner periphery of the stator core 30 from below. Then, the pushing blade portion 44 of the lower mold 41 is inserted into the slot 32 of the stator core 30.

  As shown in FIG. 21A, in the state where the insertion of the outer coil C1 is completed, the outer coil C1 is inserted into the slot 32, and the first insulating sheet (wedge) 34 is an opening of the slot 32. It is inserted so as to block. In this state, when the pushing blade portion 44 of the lower mold 41 is inserted into the slot 32 as described above, the outer coil C1 is inserted into the slot 62 via the first insulating sheet 34 as shown in FIG. Pressed against the outer diameter side.

  Next, as shown in FIG. 11, the upper mold 42 is lowered, the coil end above the outer coil C <b> 1 is pressed by the coil end molding portion 46, and the coil end is warped toward the outer diameter side of the stator core 30. Mold as follows.

  Thus, when the intermediate molding of the outer coil C1 is completed, as shown in FIG. 12, the lower mold 41 is lowered, the upper mold 42 is raised, and the core holder 60 is taken out between the two.

  Next, as shown in FIG. 13, the core holder 60 is moved again above the coil insertion jig 10. At this time, the coil 14 is inserted into the blade 14 of the coil insertion jig 10 in a predetermined gap of the blade 14 of the coil insertion jig 10 by a method disclosed in Patent Document 1 (WO2012 / 153844) described above. The inner coil C2 is placed in a state where the side is under the adjacent coil and the other side of the coil is superimposed on the coil adjacent to the opposite side of the coil and enters the predetermined gap, and is overlapped spirally as a whole. Set it.

  The coil insertion jig 10 holding the inner coil C2 is set so as to be shifted in the circumferential direction by one slot of the stator core 30 with respect to the arrangement when the outer coil C1 is set. That is, for example, in the case of a three-phase induction motor, the corresponding UVW-phase coil of the inner coil C2 is inserted so as to be shifted by one slot in the circumferential direction with respect to the UVW-phase coil of the outer coil C1.

  Then, as shown in FIG. 14, the core holder 60 is lowered and the stator core 30 is mounted on the outer periphery of the blade 14 while being guided by the core guide 50.

  In this state, as shown in FIG. 15, the drive shaft 22 is raised and connected to the coupling disposed in the recess 23 of the second stripper 30, and the stripper 20 and the spacer 24 are raised. As a result, the inner coil C2 is pushed up by the stripper 20, and the inner coil C2 is inserted into the corresponding slot 32 of the stator core 30 by the teeth 21 of the stripper 20 (see FIG. 20). At this time, the coil guide 66 disposed on the lower surface of the stator core 30 smoothly introduces the second coil C2 into the slot 32, so that resistance at the insertion portion can be reduced and damage to the coil can be reduced. As described above, all the blades 14 are fixed blades, and the inner coil C2 is inserted into all the slots 32 in a spirally overlapping state.

  As shown in FIG. 16, when the stripper 20 is raised to the maximum position, both sides of the inner coil C2 hooked on the blade 14 are completely inserted into the predetermined slots 32 of the stator core 30, and above the inner coil C2. This loop is removed from the upper end of the blade 14 and becomes a coil end protruding from the upper end surface of the stator core 30.

  When the insertion of the inner coil C2 is thus completed, the core guide 50 is removed and moved to a predetermined position via the coupling 53 and the support shaft 54 by a driving device (not shown) as shown in FIGS. . Further, as shown in FIG. 19, the stripper 20 descends and returns to the initial position.

  FIG. 21 (c) shows a state in which the inner coil C <b> 2 is thus inserted into the slot 32 of the stator core 30. As described above, the outer coil C1 is moved while being pushed to the outer diameter side by intermediate molding as shown in FIG. 5B, and the inner coil C2 is formed by the inner diameter of the slot 32 formed thereby. A second insulating sheet (wedge) 35 is inserted into the opening of the slot 32. As a result, the outer coil C1 is inserted on the outer diameter side and the inner coil C2 is inserted on the inner diameter side via the first insulating sheet 34 inserted earlier, and the end surface of the stator core 30 as shown in FIG. When it sees from, it becomes the shape where the spiral coil was inserted twice concentrically. The stator 70 of the present invention thus obtained has a low coil end and is flat and compact.

  FIG. 23 is an explanatory diagram showing how the U-phase, V-phase, and W-phase coils of the stator 70 are inserted into the respective slots 32. The numbers given to the periphery of the stator core 30 are slot numbers given for convenience of explanation. The coils inserted on the outer diameter side of the slot 32 are indicated by Ua1, Ua2 (not shown), Va1, Va2 (not shown), Wa1, Wa2 (not shown), and the inner diameter side of the slot 32. The coils inserted in are indicated by Ub1, Ub2 (not shown), Vb1, Vb2 (not shown), Wb1, Wb2 (not shown), and so on.

  As shown in this figure, the U-phase coil Ua1 on the outer diameter side is inserted into the slot 1 and the slot 6 on both sides. On the other hand, the U-phase coil Ub1 on the inner diameter side corresponding to the coil Ua1 is shifted by one slot in the circumferential direction, and both sides are inserted into the slot 2 and the slot 7.

  Similarly, the V-phase coil Va1 on the outer diameter side is inserted into the slot 3 and the slot 8 on both sides. On the other hand, the V-phase coil Vb1 on the inner diameter side corresponding to the coil Va1 is shifted by one slot in the circumferential direction, and both sides are inserted into the slot 4 and the slot 9.

  Similarly, the outer diameter side W-phase coil Wa1 is inserted into the slot 5 and the slot 10 on both sides. On the other hand, the V-phase coil Wb1 on the inner diameter side corresponding to the coil Wa1 is shifted by one slot in the circumferential direction, and both sides are inserted into the slot 6 and the slot 11.

  Similarly, the outer U-phase coil Ua2,..., V-phase coil Va2,..., W-phase coil Wa2,. They are inserted one slot apart from each other.

  As a result, the magnetic pole pitch (the width of each UVW phase forming one pole) is increased by one slot with respect to the coil pitch (interval of one coil side), resulting in a so-called short-pitch winding. Moreover, it will be in the state which a part of coil of the adjacent different phase entered into the both sides of the coil of the same phase which forms one pole. Thereby, a stator in which the magnetic field of the rotating magnetic field changes smoothly can be obtained.

  On both sides of the same-phase coil forming one pole, for example, as shown in slot 6 (Ua1 on the outer diameter side, Wb1 on the inner diameter side) and slot 8 (Va1 on the outer diameter side, Ub2 on the inner diameter side) A coil having different phases is inserted into and out of one slot.

  However, in the present invention, since the coil insertion operation is repeated twice, an insulating sheet (wedge) is inserted through the wedge guide to the opening side of the slot each time. The sheet 34 becomes an interphase insulating sheet between the coil inserted on the outer diameter side and the coil inserted on the inner diameter side, and insulation can be ensured even when coils of different phases are inserted into one slot.

  Furthermore, in the spirally wound stator, it is necessary to insert all of the blades 14 as fixed blades and simultaneously insert the spirally stacked coils into all slots, but in the present invention, by repeating the coil insertion operation twice, Since the coil is inserted twice into one slot, the amount of the coil to be inserted at one time can be halved, the insertion resistance of the coil is reduced, and excessive frictional force is applied. This can prevent the insulation coating of the coil from being damaged.

  The stator 70 of the present invention thus obtained has a small torque non-uniformity when used as a motor due to the spirally inserted coils, can reduce motor vibration and noise, and has a short coil end. There is little eddy current loss and it can contribute to the miniaturization of a motor. This stator can also be used for a generator or the like.

DESCRIPTION OF SYMBOLS 10 ... Coil insertion jig 11 ... Holder 12 ... Gear member 13 ... Wedge guide 14 ... Blade 15 ... Blade holder 20 ... Stripper 21 ... Stripe 22 ... Drive shaft 23 ... Recess 24 ... Spacer 30 ... Stator core 31 ... Teeth 32 ... Slot 33 ... slot insulating sheet 34 ... first insulating sheet 35 ... second insulating sheet 40 ... intermediate forming device 41 ... lower forming die 42 ... upper forming die 43 ... upper end 44 ... pushing blade 45 ... guide groove 46 ... coil end forming part 50 ... Core guide 51 ... Main body 52 ... Introduction portion 53 ... Coupling 54 ... Support shaft 55 ... Teeth 56 ... Teeth 60 ... Core holder 61 ... Seat plate 62 ... Top plate 63 ... Spacer ring 64 ... Cuff member 65 ... Operation rod 66 ... Coil guide 70 ... Stator C1 ... Outer coil C2 ... Inner coil

Claims (2)

In the stator in which the coil is inserted into the slot so that the coils overlap each other when viewed from the end face of the stator core,
The coil inserted into one slot is divided into two, inserted into the outer diameter side and the inner diameter side of the slot, and the spirally overlapped coil is inserted in two layers inside and outside,
Among the coils of the same phase forming the same pole, the one inserted on the outer diameter side of the slot and the one inserted on the inner diameter side of the slot are inserted shifted by one slot in the circumferential direction,
A stator in which an insulating sheet is arranged between an outer diameter side coil and an inner diameter side coil inserted into one slot. In a predetermined gap of the blade of a coil insertion jig having a plurality of blades arranged in an annular shape corresponding to the inner teeth of the stator core and a plurality of wedge guides arranged outside each blade, A coil that is set in a state where one side is under the adjacent coil and enters the predetermined gap, and the other side of the coil is superimposed on the adjacent coil on the opposite side to the predetermined gap and is overlapped spirally as a whole In the stator manufacturing method, the insulating sheet is inserted into the slot opening side through the wedge guide and simultaneously inserted into the corresponding slots of the stator core.
The coil to be inserted into one slot is divided into two, and first the coil arranged on the outer diameter side of the slot is inserted by the above method, and the insulating sheet is inserted into the slot opening side,
Next, intermediate molding is performed in which the inserted coil and insulating sheet are pressed against the outer diameter side of the slot and moved,
Further, the coil arranged on the inner diameter side of the slot is arranged so as to be shifted by one slot in the circumferential direction with respect to the coil arranged on the outer diameter side, and is inserted by the above method, and the insulating sheet is opened in the slot. By inserting on the side,
Of the same-phase coils forming the same pole, those inserted on the outer diameter side of the slot and those inserted on the inner diameter side of the slot are inserted shifted by one slot in the circumferential direction and inserted into one slot. A stator manufacturing method comprising: obtaining a stator in which an insulating sheet is disposed between an outer diameter side coil and an inner diameter side coil.