JPH08205488A - Coil insertion method to the stator core - Google Patents

Abstract

(57) [Abstract] [Purpose] In a coil insertion method by a so-called pull-through method, friction resistance when pulling out a movable blade downward is reduced without increasing the entire circumference of the coil. [Structure] When the coil 20 'is dropped into a predetermined gap of the movable blade 13 with the movable blade 13 inserted from below the stator core 12 and projected upward, the peripheral length L ₁ of a portion 20b' to be laminated below is reduced. The part 20a 'that is long and is stacked on top
The circumference L ₂ of the coil is shortened, the wedge guide 17 is brought into contact with the upper end surface of the stator core 12, the stripper 18 is lowered, and the movable blade 13 is lowered, and the coil 20 ′ is inserted into the slot 12 a of the stator core 12. .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil insertion method for inserting a coil into a slot of a stator core of a rotary electric machine, and more particularly to improvement of a coil insertion method by a pull-through method.

[0002]

2. Description of the Related Art Conventionally, as a coil insertion device, a blade arranged annularly corresponding to the inner teeth of a stator core,
It is common to have a wedge guide, which is also arranged annularly corresponding to the blades, on the outer side of these blades, and a stripper disposed inside the blades so as to be movable in the axial direction. Then, the coil is hooked so as to surround a predetermined blade, the tip of the blade is inserted into the stator core, and the stripper is slid in the axial direction to push the coil into the slot of the stator core through the gap between the blades and, at the same time, the wedge. The wedge was inserted into the slot of the stator core through the guide.

However, in the above-mentioned conventional coil inserting device, when the coil is pushed into the slot of the stator core by the stripper, a large frictional force is generated between the fixed blade and the coil, which damages the coil and causes a short circuit. Sometimes, the movement of the stripper was locked, making insertion impossible. Moreover, with the miniaturization of rotary electric machines such as motors, it is required to insert the wire more closely into the slots of the stator core, and the frictional force at the time of coil insertion tends to increase more and more.

On the other hand, Japanese Unexamined Patent Publication No. 56-115161 discloses a coil insertion device, which is a so-called pull-through type coil insertion device, which fundamentally solves the problem of frictional force during coil insertion. This coil insertion device is shown in FIGS.
This will be described with reference to 0. This coil insertion device 11 has a plurality of movable blades 13 arranged in an annular shape corresponding to the inner teeth of the stator core 12, and these movable blades 13 have their bases fixed to a blade holder 14. The movable blade 13 and the blade holder 14 are configured to move in the axial direction by a drive shaft 15. A movable casing 16 is arranged above the movable blade 13,
Wedge guides 17 are attached to 16 in an annular arrangement. The wedge guide 17 slides on the outer periphery of the movable blade 13. A stripper 18 is inserted in the wedge guide 17, and the stripper 18 is moved by a drive shaft 19 in the axial direction.

The operation of the coil inserting device 11 will be described. In the state shown in FIG. 3, the coil 20 wound around a predetermined portion of the movable blade 13 is hooked. In this case, the blade holder 14 is inserted into the stator core 12, and the movable blade 13 projects from the upper end surface of the stator core 12. As shown in FIG. 4, the movable casing 16 descends together with the stripper 18, the stripper 18 is inserted inside from the tip of the movable blade 13, and the wedge guide 17 makes sliding contact with the outer periphery of the movable blade 13. As shown in FIG. 5, the movable casing 16
Moves further down and stops when the lower end of the wedge guide 17 reaches the upper end surface of the stator core 12. As shown in FIG.
The drive shaft 19 moves the stripper 18 downward, and the drive shaft 15 also moves the blade holder 14 downward together with the drive shaft 15. 12
Inserted in the slot. At this time, the wedge guide
A wedge (not shown) is inserted through the slot 17 into the slot of the stator core 12 together. When the stripper 18 reaches the lower end surface of the stator core 12 as shown in FIG.
Is projected from the lower end surface of the stator core 12 and is completely inserted. In this state, as shown in FIG. 8, the blade holder 14 is further lowered, and the movable blade 13 is pulled out from the coil 20. Further, as shown in FIG.
18 moves upward and is pulled out from inside the stator core 12. Then, as shown in FIG. 10, the movable casing 16 rises and returns to its original position, and the insertion of the coil 20 is completed.

Coil insertion device by this pull-through method
In 11, since the movable blade 13 moves together with the stripper 18 to draw the coil 20 into the slot of the stator core 12 when the coil 20 is inserted, there is almost no frictional force between the coil 20 and the movable blade 13. , Overall, the frictional force is extremely small. Therefore, problems such as damage to the coil 20 at the time of insertion and locking of the stripper 18 are eliminated, and moreover, it is possible to insert the wire rod into the slots of the stator core 12 more densely.

[0007]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the conventional coil insertion method using, as shown on the left side of FIG. 2, all the loops of the coil 20 to be inserted into one slot 12a of the stator core 12 are formed by winding them so as to have the same length L _0. The coil 20 was inserted by the above method. Then, when the coil 20 is inserted, as shown on the left side of FIG.
The coil 20b, which is inserted on the inner peripheral side of the slot of the stator core 12 and is stacked below in FIG. 2, is inserted on the outer peripheral side of the slot of the stator core 12.

However, in the above conventional method, the coil 20
Since all the loops are formed so as to have the same length L ₀ , in the coil 20a stacked above in the state of FIG. 2, that is, in the coil 20a inserted on the inner peripheral side of the slot of the stator core 12, One end A ₁ projects longer than the upper end surface of the stator core 12, and the other end A ₂ is slackened inside the movable blade 13. On the other hand, in the coil 20b stacked downward in the state of FIG. 2, that is, in the coil 20b inserted on the outer peripheral side of the slot of the stator core 12, one end B ₁ strongly contacts the upper end surface of the stator core 12, and the other end B ₁ The end portion B _{2 of is} also strongly pulled by the movable blade 13.

As a result, when the movable blade 13 is to be pulled out downward in the state shown in FIG.
There was a case where a strong frictional force was exerted between the movable blade 13 and the movable blade 13 and it was difficult to pull the movable blade 13 downward. In this case, if the circumference of the coil 20 is lengthened as a whole, the above problem can be solved, but the length of the coil end protruding from the end surface of the stator core 12 becomes long as a whole, and the rotating electric machine incorporating the coil end has a long length. There is a problem that performance is lowered and compactness is impaired.

Therefore, the object of the present invention is to provide a method as shown in FIGS.
In the coil insertion method by the pull-through method as shown in (1), it is an object of the present invention to provide a coil insertion method that can reduce the frictional resistance when pulling out the movable blade downward without increasing the circumferential length of the coil.

[0011]

In order to achieve the above object, the coil inserting method of the present invention comprises a plurality of annular holders arranged in a ring on a blade holder movable in the axial direction of a stator core installed at a predetermined position. A movable blade of a book,
The wedge guide holders are annularly arranged and attached, and are arranged to face the movable blades with the stator core interposed therebetween, and the wedge guides are movable in the axial direction of the stator core, and through the insertion holes at the center of the wedge guide holders. Using a coil insertion device that is attached to the inserted drive shaft and includes a stripper having a plurality of teeth on the outer periphery that are inserted into the gap of the movable blade, insert the movable blade from below into the inner periphery of the stator core. hand,
A first step in which the wound coil is dropped into a predetermined gap of the movable blade to be hooked while the tip thereof is projected from the upper end surface of the stator core; and the wedge guide is lowered. A second step of bringing the tip into contact with the upper end surface of the stator core while sliding the tip to the outer periphery of the movable blade, and lowering the stripper and lowering the movable blade to a predetermined gap of the movable blade. A third step of inserting the retained coil into a predetermined slot of the stator core by means of teeth on the outer circumference of the stripper and inserting a wedge into a predetermined slot of the stator core through the wedge guide, and further lowering the movable blade. Then, pull out from the lower end surface of the stator core, raise the stripper, In the coil inserting method of performing the fourth step of pulling out from the upper end surface of the taco core and further raising the stripper and the wedge guide to return to the original position, in the first step, the coil is dropped into a predetermined gap of the movable blade and pulled. It is characterized in that the coil to be hung is formed such that the peripheral length of the portion laminated below is long and the peripheral length of the portion laminated above is short.

In carrying out the present invention, it is more preferable that the coil dropped and hooked in the predetermined gap of the movable blade in the first step is formed so that the circumferential length gradually decreases from the lower side to the upper side. preferable.

[0013]

As described above, the coil dropped and hooked in the predetermined gap of the movable blade in the first step is
The coil laminated below is inserted into the outer peripheral side of the slot of the stator core, and the coil laminated above is inserted into the inner peripheral side of the slot of the stator core.

The coil inserted into the outer peripheral side of the slot of the stator core is moved by being pulled between the tooth portion of the slot on the upper end surface of the stator core and the movable blade to be pulled out from the lower end surface of the stator core. Gives the blade a strong frictional resistance.

However, according to the present invention, in the first step, since the peripheral length of the portion laminated below the coil which is dropped into the predetermined gap of the movable blade and hooked is made long, the outer periphery of the slot of the stator core is formed. The circumferential length of the coil inserted on the side is increased, the frictional resistance applied to the movable blade is reduced, and the movable blade can be easily pulled out.

Further, in the first step, since the peripheral length of the portion stacked above the coil which is dropped into the predetermined gap of the movable blade and hooked is formed to be short, it is inserted into the inner peripheral side of the slot of the stator core. Although the circumference of the coil becomes shorter, the coil inserted inside the slot of the stator core tends to have excess upper and lower ends protruding from the upper and lower end faces of the stator core when inserted into the slot of the stator core. Even if the circumference is short, the coil can be easily inserted and the movable blade can be pulled out easily.

As a result, the entire length of the coil can be made equal to or shorter than that of the conventional method, and the movable blade can be easily pulled out without deteriorating the performance of the stator core. It is possible to solve the drawback that has been a bottleneck in the insertion method.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The coil inserting method of the present invention is basically the same as the conventional pull-through type coil inserting method shown in FIGS.

That is, in FIG. 3, the movable blade 13
Is inserted into the inner circumference of the stator core 12 from below, and with its tip protruding from the upper end surface of the stator core 12, the wound coil 20 is dropped into a predetermined gap of the movable blade 13 to be hooked. The process corresponds to the first process of the present invention.

Next, referring to FIGS. 4-5, the wedge guide
The step of lowering 17 and bringing the tip into contact with the upper end surface of the stator core 12 while sliding the tip thereof to the outer periphery of the movable blade 13 corresponds to the second step of the present invention.

Continuing to refer to FIGS.
While lowering the movable blade 13,
The step of inserting the coil 20 held in the predetermined gap of the movable blade 13 into the predetermined slot of the stator core 12 by the outer peripheral teeth of the stripper 18 and inserting the wedge into the predetermined slot of the stator core 12 through the wedge guide 17, This corresponds to the third step of the present invention.

Further, referring to FIGS.
13 is further lowered and pulled out from the lower end surface of the stator core 12, and the stripper 18 is raised and pulled out from the upper end surface of the stator core 12, and further stripper 18 and wedge guide 17
The step of raising and returning to the original position corresponds to the fourth step of the present invention.

The coil insertion method of the present invention is characterized in that in the above step, the circumferential length of the coil 20 in the first step is changed so as to become shorter from the lower side toward the upper side.

1 and 2 show a characteristic part of the coil inserting method of the present invention. FIG. 1 is an explanatory view showing a state when the third step is completed, and FIG. 2 shows a state in the first step. FIG. The coil 20 shown on the left side in FIGS. 1 and 2 represents a coil manufactured by the conventional method, and the coil 20 ′ described on the right side represents a coil manufactured by the method of the present invention.

In FIGS. 1 and 2, reference numeral 21 denotes a pallet for supporting the stator core 12, which is mounted with the stator core 12 and moves from the position of the winding device to the position of the coil insertion device, and at the position of the coil insertion device a frame (not shown). Is supported by.

Reference numeral 22 in FIG. 1 denotes a wedge guide holder that supports the wedge guides 17 arranged in an annular shape.
The wedge guide 17 moves up and down by a drive mechanism (not shown). The movable blade 13 has a lower end of a blade holder 14 to which a drive shaft (not shown) is detachably connected so that the movable blade 13 can move up and down.

As shown in FIG. 2, according to the coil insertion method of the present invention, the movable blade 13 is inserted into the inner circumference of the stator core 12 from below, and the tip of the movable blade 13 is projected from the upper end surface of the stator core 12 to wind it. In the first step in which the coiled wire 20 'is dropped into a predetermined gap of the movable blade 13 to be hooked, the coiled wire 20' is laminated below the portion 20.
The peripheral length L ₁ of b'is long, and the peripheral length L _{2 of the} portion 20a 'to be stacked above is long.
To be short.

For the winding of such a coil, for example, as shown in Japanese Patent Publication No. 6-24416 by the present applicant, a winding device capable of changing the distance between a pair of winding frames in the winding is used. It can be done by Further, if the above winding device is used, the coil 20 'is not only wound so as to gradually shorten the circumferential length from the lower side to the upper side as shown in FIG. 2, but is also wound so as to be gradually shortened from the lower side to the upper side. You can also

In the present invention, the circumference of the coil 20 'may be gradually shortened from the lower side to the upper side, or may be gradually shortened from the lower side to the upper side. For example,
The circumference of the lower half of the coil 20 'may have a certain length and the circumference of the upper half may have a shorter length. However, in order to maximize the effect of facilitating the extraction of the movable blade 13 while shortening the entire length of the coil 20 'as much as possible,
The coil 20 'is preferably formed such that the circumference of the coil 20' is gradually shortened from the lower side to the upper side.

As shown in FIG. 1, when the coil 20 'is inserted into the slot 12a of the stator core 12, the portion 20b' laminated below the coil 20 'in the state of FIG.
A portion 20a 'which is inserted on the outer peripheral side of a and is stacked above the coil 20' in the state of FIG. 2 is inserted on the inner peripheral side of the slot 12a.

Coil inserted on the outer peripheral side of the slot 12a
20b 'is a slot 12a on the upper end surface of the stator core 12.
A portion of the tooth, but is pulled in between the movable blade 13 is trying to pull out from the lower end surface of the stator core 12, the coil 20b 'is as described above, since the circumferential length L ₁ is longer, sufficient A margin is provided, and the frictional force when pulling out the movable blade 13 can be reduced.

The coil 20a 'inserted in the inner peripheral side of the slot 12a is provided between the tooth portion of the slot 12a on the upper end surface of the stator core 12 and the movable blade 13 to be pulled out from the lower end surface of the stator core 12. Since the distance is shorter than that on the outer peripheral side, even if the peripheral length L ₂ is short, a strong pulling force, a frictional force, or the like need not be applied when inserting the coil 20 ′ and pulling out the movable blade 13.

Therefore, according to the method of the present invention, the insertion of the coil 20 'and the withdrawal of the movable blade 13 can be performed without difficulty, and the entire length of the coil 20' is equal to or larger than that of the conventional method. Can also be shortened.

[0034]

As described above, according to the coil insertion method of the present invention, in the so-called pull-through type coil insertion method, insertion of the coil and extraction of the movable blade can be performed without difficulty, and the entire coil The length can be equal to or shorter than the conventional method. As a result, the linear density of the coil inserted into one slot is increased, the length of the coil ends protruding from the upper and lower end surfaces of the stator core is shortened, and a stator core having excellent performance can be efficiently produced. .

[Brief description of drawings]

FIG. 1 is an explanatory view showing a state when a third step in a coil insertion method of the present invention is completed.

FIG. 2 is an explanatory diagram showing a state in a first step in the coil inserting method.

FIG. 3 is an explanatory diagram showing a first step of a coil insertion method by a pull-through method.

FIG. 4 is an explanatory view showing the beginning of the second step of the coil insertion method by the pull-through method.

FIG. 5 is an explanatory diagram showing the end of the second step of the coil insertion method using the pull-through method.

FIG. 6 is an explanatory diagram showing the beginning of a third step of the coil insertion method by the pull-through method.

FIG. 7 is an explanatory diagram showing the end of the third step of the coil insertion method using the pull-through method.

FIG. 8 is an explanatory view showing the beginning of the fourth step of the coil inserting method by the pull-through method.

FIG. 9 is an explanatory diagram showing the middle of the fourth step of the coil insertion method by the pull-through method.

FIG. 10 is a fourth coil insertion method according to the pull-through method.
It is explanatory drawing which shows the end of a process.

[Explanation of symbols]

12 Stator core 13 Movable blade 14 Blade holder 17 Wedge guide 18 Stripper 19 Drive shaft 20 'Coil 20a' Upper coil 20b 'Lower coil 22 Wedge guide holder L ₁ Circumferential length of lower coil Perimeter of coil stacked above L ₂

Claims (2)

[Claims] 1. A plurality of movable blades, which are annularly arranged and attached to a blade holder that is movable in the axial direction of a stator core installed at a predetermined position, and annularly arranged and attached to a wedge guide holder, The movable blade is disposed so as to face the movable blade with the stator core interposed therebetween, and is attached to the wedge guide that is movable in the axial direction of the stator core, and the drive shaft that is inserted through the insertion hole at the center of the wedge guide holder. Using a coil insertion device provided with a stripper having a plurality of teeth inserted in a gap on the outer circumference, the movable blade is inserted into the inner circumference of the stator core from below, and its tip is projected from the upper end surface of the stator core. In this state, the wound coil is dropped into the predetermined gap of the movable blade to be hooked. One step, a second step of lowering the wedge guide and bringing the tip thereof into contact with the upper end surface of the stator core while slidingly contacting the outer periphery of the movable blade; and lowering the stripper and moving the movable guide. While lowering the blade, the coil held in the predetermined gap of the movable blade is inserted into the predetermined slot of the stator core by the teeth on the outer periphery of the stripper, and the wedge is passed through the wedge guide to the predetermined slot of the stator core. A third step of inserting, further lowering the movable blade to pull out from the lower end surface of the stator core, raising the stripper to pull out from the upper end surface of the stator core, and further raising the stripper and the wedge guide. In the coil insertion method that performs the fourth step of returning to the position In the first step, the coil that is dropped and hooked in the predetermined gap of the movable blade is formed such that the peripheral length of the portion laminated below is long and the peripheral length of the portion laminated above is short. A method for inserting a coil into a stator core, comprising: 2. The stator core according to claim 1, wherein in the first step, a coil that is dropped into a predetermined gap of the movable blade and hooked therein is formed such that a circumferential length thereof gradually decreases from a lower side to an upper side. Coil insertion method.