JPH11299187A - Skewed stator manufacturing equipment - Google Patents

Abstract

(57) [Problem] To provide a skewed stator manufacturing apparatus capable of manufacturing a skewed stator with good workability by a relatively simple method without manual operation. SOLUTION: After a coil C is inserted into a stator core 10 formed by laminating magnetic metal pieces using a coil insertion device, the stator core 10 is rotatably supported on a support base, and the stator core 10 is rotatably supported on an inner periphery of the stator core 10. The skew center post 44a is inserted, and the ridge 44d formed on the outer periphery of the skew center post 44a is inserted into the slot opening of the stator core 10, and the helical ridge 44 is formed.
The twist is given to each magnetic metal piece by d. Also, a tapered groove 44c provided around the base of the skew center post 44a.
And an outer former 45b and an inner former 4 arranged on opposite sides of the skew center post 44a.
5a, the coil end Ce is shaped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing a skewed stator for imparting a twist to a stator core formed by laminating a plurality of magnetic metal pieces.

[0002]

2. Description of the Related Art Conventionally, in order to smoothly rotate a motor, a magnetic pole of a rotor (rotor) is twisted (skewed) along an axial direction to continuously rotate the magnetic pole of a stator (stator). It has been practiced to provide an attractive or repulsive force. As a method of imparting a twist to the magnetic poles of the rotor, a method of gradually shifting the position of the magnet to be attached to the circumferential surface of the rotor in the circumferential direction while being aligned in the axial direction is mainly adopted.

On the other hand, with the development of electric vehicles and the like in recent years, smaller and higher-performance motors have been required, and various improvements have been made regarding the arrangement of magnets mounted on a rotor. For example, a plate-shaped or arc-shaped magnet is placed such that both ends are close to the peripheral surface of the rotor,
It has been proposed to improve the performance of a motor due to a reluctance effect by burying the motor inside a rotor.

[0004]

However, if the arrangement of the magnets to be mounted on the rotor is as described above, the buried structure of the magnets becomes complicated, so that it becomes difficult to provide skew to the magnetic poles of the rotor. was there.

In order to solve this problem, it is conceivable to skew the magnetic poles of the stator core by gradually shifting the magnetic metal pieces constituting the stator core. However, when the stator core is skewed, the slot becomes a spiral shape, The conventional coil insertion device has a problem that coil insertion becomes impossible.

For this reason, a skewed stator can only be manufactured by a method of manually inserting a coil into a slot of a skewed stator core.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a skewed stator manufacturing apparatus capable of manufacturing a skewed stator with good workability by a relatively simple method without manual operation.

[0008]

In order to achieve the above object, a manufacturing apparatus of a skewed stator according to the present invention has a coil inserted into a slot formed in a stator core formed by laminating a plurality of magnetic metal pieces. A manufacturing apparatus for a skewed stator for applying a twist so that each of the magnetic metal pieces is gradually displaced, wherein the support base rotatably supports the stator core in which the coil is inserted, and wherein the stator core includes the support base. And a skew center post having a helical torsion guide on the outer periphery inserted into the inner periphery of the stator core so as to be able to advance and retreat, and inserted into a slot opening of the stator core. And

According to the present invention, the coil is inserted into the slot by using a conventional general coil insertion device while the magnetic metal piece of the stator core is not twisted and the slot is straight. Then, the stator core is rotatably installed on the support base, and in this state, the skew center post is inserted into the stator core from one end face of the stator core. At this time, the helical guide of the skew center post is inserted into the slot opening on the inner periphery of the stator core, and each magnetic metal piece constituting the stator core is twisted and skewed by the helical guide.
Thus, after the skew center post is pushed in to skew the stator core, the skew center post is retracted and the stator core is pulled out. At this time, the skewed stator core rotates on the support base, and the helical guide portion of the skew center post can be pulled out.

According to a preferred aspect of the present invention, a tapered portion is formed at the base of the skew center post, the coil end protruding from one end face of the stator core being pushed out and formed to the outer periphery.

According to this aspect, when the skew center post is pushed in, the coil end protruding from one end face of the stator core can be pushed outward and formed by the tapered portion of the skew center post.

According to a further preferred aspect of the present invention, an outer former abutting on the other end face of the stator core is provided on an opposite side of the skew center post across the support table, and protrudes from the other end face. And an inner former having a tapered portion formed by pressing and expanding the coil end around the outer periphery are arranged so as to be able to advance and retreat, respectively.

According to this aspect, when the skew center post is pushed in from one end face of the stator core, the outer former can be brought into contact with the other end face of the stator core to prevent the axial movement of the stator core. By pushing the inner former after or almost simultaneously with pushing the skew center post, the coil end projecting from the other end face of the stator core can be pushed outward and formed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 12, the stator core 10 is formed by laminating a plurality of magnetic metal pieces 11 made of, for example, a silicon steel plate in order to prevent eddy current loss. The conventional stator core has a magnetic metal piece 11.
Are laminated to each other, and the magnetic metal pieces 1
No shifting of ones from another was done. In the present invention, in order to impart a twist to the stator core 10, when laminating the magnetic metal pieces 11, they are not completely fixed to each other but are temporarily fixed in a state where they can be freely rotated to some extent. Each magnetic metal piece 1 forming the stator core 10
A plurality of slots 13 are formed at predetermined intervals on the inner circumference of 1, and the coil C is inserted into the slots 13.

The coil insertion device 20 is a well-known device that has been conventionally used. The coil insertion device 20 has a plurality of blades 21 arranged annularly so as to guide the coil to the slots 13 of the stator core 10. Are fixed to the annular blade holder 22. Also, the blade 21
A plurality of wedge guides 23 are arranged corresponding to the respective blades 21 on the outside of the base, and the base of each of these wedge guides 23 is fixed to an annular wedge guide holder 24. A stripper 25 is disposed inside the blade 21, and the stripper 25 is
The shaft 27 can be moved axially by a drive shaft (not shown) inserted into the hole 27. Reference numeral 28 denotes an adapter plate for connecting the wedge guide 23 and the barrel 26, 29
Is a coil separator.

In the operation of the coil insertion device 20, the coil C, which is wound in a predetermined manner by a coil winding device (not shown), is hung in a predetermined gap between the blade 21 and the wedge guide 23. Next, the stator core 1
0 is mounted on the outer periphery of the upper end of the blade 10, and the stator core 10 is fixedly supported by a holder (not shown). At this time, the plurality of magnetic metal pieces 11 forming the stator core 10 are temporarily fixed in a state where the slots 13 formed on the inner circumference thereof are arranged in a straight line parallel to the axial direction.

In this state, when the stripper 25 and the wedge pusher (not shown) are raised by a drive shaft (not shown), the stripper 25 pushes up the coil C along the blade 21 and the gap between the wedge guides 23 by the wedge pusher. Push up the wedge inserted in the. Then, the coil C is inserted into the slot 13 of the stator core 10, and thereafter, a wedge (not shown) is inserted so as to close the opening opening on the inner peripheral surface of the slot 13. Note that these operations are basically the same as the coil insertion operations that have been conventionally performed, and thus detailed description thereof will be omitted. Of course, the coil insertion device is not limited to the above-described configuration, and it is also possible to use, for example, a coil insertion device of the type shown in Japanese Patent Publication No. 6-34561 by the present applicant.

FIG. 13 shows slot 1 of stator core 10.
3 shows a state where the coil C is inserted into the stator core 3 as viewed from the inner peripheral surface side of the stator core 10. The slot 13 is in a linear state parallel to the axis of the stator core 10,
A coil 13 is inserted into a slot 13 having a predetermined pitch. As a method for mounting the coil C on the stator core 10, there are a direct winding method in which a coil is wound directly around the internal teeth 14 and a coil insertion method in which a coil wound in advance is inserted into the slot 13. , A coil insertion method is employed. The reason is that in the case of the coil insertion method, the coil end projecting from the end face of the stator core 10 is relatively long, so that the stator core 10 can be twisted after the coil is mounted.

Next, the structure of the skewed stator manufacturing apparatus 40 according to the present invention will be described with reference to FIGS. A loading device 42 is disposed substantially at the center of a base 41 of the manufacturing apparatus 40. The loading device 42 is provided with the stator core 10
Is moved from the setting position 43a toward the jig center position 43b, and the stator core 10 is rotatably supported by the support 42a of the loading device 42. The loading device 43 at the jig center position 43b
In the direction orthogonal to the moving direction of the jig, the jig center position 4
A lead-side former 44 and a non-lead-side former 45 are opposed to each other with a pair of opposed stands 3b standing on the base 41 at the rear end of the lead-side former 44.
A guide shaft 47, which is inserted and supported so as to be able to move forward and backward, is fixedly mounted on the a and b, and an operating cylinder 48 is disposed below the guide shaft 47. The working cylinder 48 is fixed to the stands 46a and 46b, and the piston rod 48a is connected to the guide shaft 47.
Are connected to each other via a link 49.

On the other hand, the non-lead side former 45 includes an inner former 45a and an outer former 45b inserted around the outer periphery of the inner former 45a, and the back surface of the inner former 45a is attached to the piston rod 50a of the inner cylinder 50. It is installed continuously. A ring 45c is fixed to the outer periphery of the back surface of the outer former 45b, and the piston rod 51a of the outer cylinder 51 is connected to the ring 45c. The two cylinders 50 and 51 are fixed on a stand 52a erected on the base 41 in a vertical line.
a is another stand 52 opposite to the stand 52a.
b.

At the center of the lead-side former 44, a skew center post 44a protruding from the inner periphery of the stator core 10 is provided. Further, a flange 44b is formed at the base of the skew center post 44a. The flange 44b engages with the coil end Ce of the coil C protruding from the rear end face of the stator core 10 to expand the coil end Ce. A skirt-shaped tapered groove 44c, which is an example of a tapered portion, is provided in a loop.

A plurality of ridges 44d as twist guides are provided on the outer periphery of the skew center post 44a and engage with the openings 13a (see FIG. 10) of the slots 13 formed on the inner periphery of the stator core 10. (Note that only one ridge 44d is shown in the figure).
The ridge 44d is formed in a helical shape, and a tapered guide surface 44e (see FIG. 11) is formed at the tip thereof.

Further, the tip of the outer former 45b of the anti-lead side former 45 is engaged with the outer periphery of the coil end Ce protruding from the front end face of the stator core 10, and hooks the front end face of the stator core 10. .
A skirt-shaped tapered portion 45d for expanding the coil end Ce is formed at the tip of the inner former 45a inserted into the inner periphery of the outer former 45b.

Next, an operation of skewing the stator core 10 in which the coil C is inserted by using the manufacturing apparatus 40 having the above configuration will be described. When the coil C is completely inserted into the slot 13 of the stator core 10 using the coil insertion device 20 shown in FIG.
It is conveyed to the manufacturing apparatus 40 so as to form a skew at zero, and is placed on the loading apparatus 42 waiting at the set position 43a of the manufacturing apparatus 40. Then, the stator core 10 is transferred to the jig center position 43b while being rotatably supported by the loading device 42.

When the stator core 10 is at the jig center position 4
3b, the outer former 45b provided on the non-lead side former 45 is moved to the outer cylinder 51.
, The front end surface of which is in contact with the front end surface of the stator core 10 to hold the outer periphery of the coil end Ce of the coil C protruding from the front end surface (the state of FIG. 3).

Next, the lead-side former 44 is moved closer to the rear end face of the stator core 10 by the retreating operation of the working cylinder 48, and the skew center post 44 a provided on the lead-side former 44 is moved to the inner periphery of the stator core 10. (The state shown in FIG. 4).

Then, each magnetic metal piece 11 forming the stator core 10 is inscribed in the skew center post 44a, and a tapered shape formed at the tip of a ridge 44d formed on the outer periphery of the skew center post 44a. The guide surface 44e is engaged with the opening 13a of the slot 13 formed on the inner periphery of each magnetic metal piece 11 (the state shown in FIG. 11A).

Since the ridges 44d are formed in a helical shape, as the skew center posts 44a are inserted into the stator core 10, as shown in FIG. The magnetic metal piece 11 is skewed through the opening 13a of the metal piece 11.

The skew center post 44a
The flange 44b formed at the base of the stator core 1
0, the coil end Ce of the coil C projecting from the rear end face is engaged with the skirt-shaped tapered groove 44c provided around the flange 44b, and the coil end Ce is expanded. (FIG. 5). At the same time, the guide surface 44e formed at the tip of the ridge 44d projects from the front end surface of the stator core 10, and the skew of the entire magnetic metal piece 11 forming the stator core 10 is completed (the state of FIGS. 11C and 14).

Thereafter, the inner former 45a provided on the non-lead-side former 45 and housed in the outer former 45b is protruded by the operation of the inner cylinder 50, and a tapered portion 45d formed in a skirt shape at the tip.
Enters the inner periphery of the coil end Ce of the coil C protruding from the front end face of the stator core 10, and expands and shapes the coil end Ce (the state of FIG. 6).

Next, in this state, the stator core 1
The magnetic metal pieces 11 forming 0 are fixed to each other. As the fixing means, for example, welding or caulking of the individual magnetic metal pieces 11 can be considered. Individual magnetic metal pieces 1
In the case of caulking 1, for example, a groove for mounting a fixing metal is formed in the outer periphery of each magnetic metal piece 11 in advance, and after the skew of the stator core 10 is completed, the fixing metal is mounted in this groove and caulked. . Alternatively, a method is conceivable in which a hole matching when the skew is completed is formed in advance in each magnetic metal piece 11, and a pin is attached to this hole and swaged.

After the stator core 10 is fixed, the inner cylinder 50 is retracted to pull out the inner former 45a from the front end face of the stator core 10 (the state shown in FIG. 7). By operating, the lead-side former 44 is pulled out from the rear end face of the stator core 10 (the state of FIG. 8). At this time, the ridge 44d is formed in a helical shape and the stator core 1
0 is rotatably supported, so that this ridge 44d
Can be easily extracted from the opening 13 a formed in the slot 13 of the stator core 10.

Next, the outer cylinder 51 is operated, and the outer former 45b is retracted from the front end face of the theta core 10 (the state shown in FIG. 9). Thereafter, the loading device 42 is operated to move the stator core 10 from the jig center position 43b to the first set position 43a.

As described above, in the present embodiment, the step of shaping the coil ends Ce protruding from both ends of the stator core 10 and the step of skewing the magnetic metal pieces 11 are performed simultaneously, so that the manufacturing process can be shortened. I can do it.

[0035]

As described above, according to the present invention,
By inserting a coil into the slot of the stator core in a state where the slot is straight without giving a twist to the metal piece forming the stator core, the coil can be inserted using a conventional general coil insertion device.

After the coil is inserted, the skew center post is inserted into the stator core, and the stator core is twisted so that the metal pieces constituting the stator core are gradually displaced. It can be manufactured with high productivity.

Further, a taper portion is provided at the base of the skew center post, and an outer former abutting on the other end face of the stator core is provided on the opposite side of the skew center post across the support base, and protrudes from the other end face. When an inner former having a tapered portion is formed by pushing and expanding the coil end around the outer periphery, a step of imparting skew to the stator core and a step of shaping the coil end projecting from the end face of the stator core are simultaneously performed. Do
The manufacturing process can be shortened.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of an apparatus for manufacturing a skewed stator according to the present invention.

FIG. 2 is a partial cross-sectional side view of the manufacturing apparatus.

FIG. 3 is a cross-sectional side view of a main part showing a state in which an outer former of the opposite lead side former is advanced.

FIG. 4 is a sectional side view of a main part of the lead-side former in a state where a skew center post is advanced.

FIG. 5 is a sectional side view of a main part of the lead-side former in a state where a skew center post has reached a forward end;

FIG. 6 is a cross-sectional side view of a main part showing a state where an inner former of the same non-lead side former has been advanced.

FIG. 7 is a cross-sectional side view of a main part showing a state in which the inner former of the same non-lead side former is retracted.

FIG. 8 is a sectional side view of a main part of the lead-side former in a state where a skew center post is retracted.

FIG. 9 is a cross-sectional side view of an essential part showing a state in which the outer former of the same non-lead side former is retracted.

FIG. 10 is a sectional view taken along line AA of FIG.

FIG. 11 is a cross-sectional view of a main part of the stator core, as viewed from the inner periphery of the internal teeth, showing a process of imparting a twist to the stator core for each state.

FIG. 12 is a sectional view showing an example of the coil insertion device.

FIG. 13 is a partially enlarged schematic view showing a state in which a coil is inserted into the stator core, as viewed from the inner periphery of the internal teeth of the stator core.

FIG. 14 is a partially enlarged schematic view showing a state where the stator core of FIG. 13 is twisted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Stator core 11 Magnetic metal piece 13 Slot 14 Internal teeth 20 Coil insertion device 40 Manufacturing device of stator with skew 44 Skew center post 44c Taper portion 44d Twist guide portion C coil

Claims (3)

[Claims] 1. A manufacturing apparatus for a skewed stator, in which a coil is inserted into a slot formed in a stator core formed by laminating a plurality of magnetic metal pieces, and then the magnetic metal pieces are twisted so as to be gradually shifted. A support base for rotatably supporting the stator core in which the coil is inserted, and a state in which the stator core is supported by the support base, and is inserted into the inner periphery of the stator core so as to be able to advance and retreat, and A skew center post having a helical torsion guide inserted into the slot opening on the outer periphery thereof. 2. The apparatus for manufacturing a skewed stator according to claim 1, wherein a tapered portion is formed at a base of the skew center post so as to expand and form a coil end projecting from one end face of the stator core to an outer periphery. . 3. An outer former abutting on the other end face of the stator core, and a coil end protruding from the other end face being pushed outward on the opposite side of the skew center post across the support base. 3. The apparatus for manufacturing a skewed stator according to claim 1, wherein the inner former having a tapered portion formed by molding is arranged to be able to advance and retreat.