JPH11225461A - Method and apparatus for manufacturing skewed stator - Google Patents

Abstract

[PROBLEMS] To provide a method and an apparatus for manufacturing a skewed stator in which a coil can be inserted using a conventional general coil insertion apparatus. SOLUTION: After inserting a coil C into a stator core 10 formed by laminating magnetic metal pieces using a coil insertion device, the coil C is mounted on the outer periphery of a center post 43, and a notch 12 formed on the outer periphery of the stator core 10 is formed. A plate 52 is inserted into the stator core 1, and the plate 52 is rotated and inclined about a support shaft 51 arranged substantially at the center of the stack thickness of the stator core 10, and the stator core 1 is rotated.
The magnetic metal piece of 0 is gradually shifted to give a twist.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a skewed stator in which coils are mounted on a stator core which is formed by laminating magnetic metal pieces and twists the metal pieces gradually. .

[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.

Accordingly, an object of the present invention is to provide a method and an apparatus for manufacturing a skewed stator in which a coil can be inserted using a conventional general coil insertion apparatus.

[0008]

In order to achieve the above object, a method of manufacturing a skewed stator according to the present invention is constituted by laminating magnetic metal pieces, and twisting the metal pieces so that the metal pieces are gradually shifted. In the method for manufacturing a skewed stator in which a coil is mounted on a stator core, the metal piece is not twisted, and after inserting the coil into the slot of the stator core in a state where the slot is straight, the metal piece is gradually shifted. It is characterized by twisting.

In the above-mentioned manufacturing method, as a method of giving a twist to the metal piece, a notch matching each other is provided on an outer periphery of the metal piece, and after inserting the coil into a slot of the stator core, A method is preferably adopted in which a plate is inserted along the notch where the metal piece is aligned, and the plate is inclined with respect to the axis of the stator core so that the metal piece is gradually displaced.

In the manufacturing apparatus for a skewed stator according to the present invention, a coil is inserted into a slot of a stator core formed by laminating magnetic metal pieces having notches aligned with each other on the outer periphery, and then the metal of the stator core is inserted into the slot. In a manufacturing apparatus for a skewed stator that twists so that pieces are gradually shifted, a center post that is inserted into the inner periphery of the stator core and supports the stator core in a state where the metal pieces can rotate relative to each other, A plate that is pivotally supported on the axis of the stator core so as to be able to pivot about the center of the stack thickness, and that is inserted along a matching notch of the metal piece. .

According to the manufacturing method of the present invention, a coil is inserted into a slot of a stator core in a state where a slot is straight without giving a twist to a metal piece constituting a stator core, thereby providing a conventional general coil insertion device. Can be used to insert the coil. Further, after inserting the coil, the stator core can be manufactured by twisting the stator core so that the metal pieces constituting the stator core are gradually shifted.

[0012] Thereby, for example, a plate-shaped or arc-shaped magnet is placed so that both ends thereof are close to the peripheral surface of the rotor.
It is possible to adopt a rotor having an enhanced reluctance effect by being embedded inside the rotor, which can contribute to further downsizing and higher performance of the motor.

Further, according to the manufacturing apparatus of the present invention, the stator core into which the coil is inserted is mounted on the center post, a plate is inserted into a notch formed on the outer periphery of the stator core, and the fulcrum is provided about the center of the thickness of the stator core. By inclining the plate, the magnetic metal plate constituting the stator core is pushed by the plate and gradually displaces, so that the stator core can be skewed. As described above, the skewed stator can be manufactured by a device having a relatively simple structure.

[0014]

1 to 3 show one embodiment of an apparatus for manufacturing a skewed stator according to the present invention.
2 is a front view, FIG. 2 is a plan view, and FIG. 3 is a side sectional view showing a left half in section. FIG. 4 is a sectional view showing an example of the coil insertion device used in the present invention. FIG. 5 is a partially enlarged schematic diagram 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, and FIG. 6 is a partially enlarged schematic diagram showing a state in which the stator core of FIG. 5 is twisted.

As shown in FIG. 4, the stator core 10
In order to prevent eddy current loss, a magnetic metal piece 11 made of, for example, a silicon steel plate is laminated. In the conventional stator core, the magnetic metal pieces 11 are stacked and fixed to each other, and the magnetic metal pieces 11 are not shifted from each other. In the present invention, the stator core 10
When the magnetic metal pieces 11 are stacked, the magnetic metal pieces 11 are allowed to be shifted from each other without being completely fixed to each other.

As shown in FIG. 2, the magnetic metal piece 11 of the stator core 10 used in the present invention is formed with notches 12 at four locations on the outer periphery so that the notches 12 are continuous in the axial direction. Has been aligned. Before the coil is inserted, the magnetic metal pieces 11 of the stator core 10 are arranged so as to be aligned with each other, and the notch 12 forms a straight line parallel to the axis of the stator core 10.

As the coil insertion device used in the present invention, a conventionally used coil insertion device can be used. For example, a coil insertion device 20 as shown in FIG. 4 is used.
The coil insertion device 20 has a plurality of blades 21 arranged annularly so as to guide the coils to the slots 13 of the stator core 10, and the base of the blades 21 is fixed to an annular blade holder 22. Also, blade 2
A plurality of wedge guides 23 are arranged outside of 1 in correspondence with the blades 21, and the bases of these wedge guides 23 are fixed to an annular wedge guide holder 24. A stripper 25 is disposed inside the blade 21, and the stripper 25 is
Are axially movable by a drive shaft (not shown) inserted into the drive shaft. 28 is a wedge guide holder 27
And an adapter plate for connecting the shaft cylinder 26 and 29.
Is a coil separator.

In operation of the coil insertion device 20, the coil C wound by a coil winding device (not shown) is hooked through a predetermined gap between the blade 21 and the wedge guide 23. And the stator core 1
0 is mounted on the outer periphery of the upper end of the blade 10 and fixedly supported by a holder (not shown). At this time, as described above, the magnetic metal pieces 11 of the stator core 10 are aligned with each other so that the notch 12 forms a straight line parallel to the axis of the stator core 10. In this state, the stripper 25 is pushed up by a drive shaft (not shown), and the wedge inserted into the gap of the wedge guide 23 is pushed up by a wedge pusher (not shown). As a result, the coil C held by the blade 21 is guided by the blade 21 and inserted into the slot 13 of the stator core 10, and a wedge is inserted into the slot 13 so as to close the opening of the slot 13. These operations are basically the same as conventional coil insertion operations.

For the coil insertion, not only the coil insertion device 20 as shown in FIG. 4 but also a coil insertion device of the type shown in Japanese Patent Publication No. 6-34561 by the present applicant can be used. .

FIG. 5 shows a state as viewed from the inner circumference of the internal teeth 14 of the stator core 10 into which the coil C is inserted. That is, the slot 13 is in a linear state parallel to the axis of the stator core 10, and the predetermined slot 1
3, a coil 13 is inserted. There are two methods for mounting a coil on the stator core: a direct winding method in which a coil is formed by directly winding the internal teeth, and a coil insertion method in which a pre-wound coil is inserted into a slot. In the invention, a coil insertion method is adopted. 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, an embodiment of an apparatus for manufacturing a skewed stator according to the present invention will be described with reference to FIGS. The manufacturing apparatus 40 includes a substantially square substrate 41.
At the approximate center of the substrate 41, a cylindrical center post 43 is erected. Center post 43
Has an outer diameter that is suitable for the inner circumference of the stator core 10, and a step portion 44 is formed on the outer circumference of the middle portion thereof.
When the center post 43 is inserted through the inner periphery of the center core 0, the lower edge of the stator core 10 is engaged with and supported by the step 44. The upper end of the center post 43 is closed by a top plate 45, and a screw hole 4 is formed at the center thereof.
6 are formed. Further, a cover plate 47 is disposed on the upper end surface of the stator core 10 mounted on the center post 43, and a bolt 48 inserted into the cover plate 47 via a spring washer 49 is screwed into a screw hole 46 of the center post 43. Is being worn. Therefore, the stator core 10 is mounted and supported on the center post 43, and is elastically pressed and fixed by the cover plate 47 via the spring washer 49.

At the center of each side of the substrate 41, columns 42 are erected. A plate 52 is pivotally supported at the upper end of each support 42 via a support shaft 51. This support shaft 51
Are located in the middle part of the thickness of the stator core 10.
The surface of the plate 52 facing the stator core 10 has a narrow width and forms an elongated ridge 52a.
Are inserted into notches 12 formed on the magnetic metal pieces 11 of the stator core 10 and aligned with each other. Also, the substrate 4
Air cylinders 54 are installed at the four corners of the air cylinder 54, and the tip of an operating rod 55 of the air cylinder 54 is connected to a pin 53 provided at the lower end of the plate 52. Therefore,
When the air cylinder 54 operates, the plate 52 swings about the support shaft 51 via the operating rod 54 and the pin 53. The operation of each air cylinder 54 is performed synchronously. As shown in FIG. 2, the support column 42 is provided with stopper bolts 56 projecting from both sides of the plate 52 by a predetermined length.
2 can be adjusted.

Next, a method of skewing the stator core 10 into which the coil is inserted by using this manufacturing apparatus will be described. After inserting the coil C into the slot 13 of the stator core 10 by the method shown in FIG.
Is mounted on the outer periphery of the center post 43 and is engaged with and supported by the step portion 44 of the center post 43. At this time, the protrusions 52 a of the four plates 52 are connected to the magnetic metal pieces 11 of the stator core 10.
In the corresponding notch 12 of the above. Further, the cover plate 47 is placed on the upper end surface of the stator core 10 and tightened with the bolts 48 inserted through the spring washers 49. As a result, the magnetic metal pieces 11 of the stator core 10 can be held in a bound state while allowing mutual rotation without completely fixing the magnetic metal pieces 11.

In this state, the respective air cylinders 54 are operated synchronously, and the respective plates 52 are inclined by the same angle about the support shaft 51 via the operating rod 55 and the pin 53.
As a result, the magnetic metal piece 11 in which the ridge 52 a of the plate 52 is fitted into the notch 12 is moved around the center post 43 by the plate 52.
The magnetic metal piece 11 is twisted by being pressed by the torsion action. At this time, since the coil C protrudes from the upper and lower end surfaces of the stator core 10 with a certain margin, the coil C is not pulled and the rotation of the magnetic metal piece 11 is not prevented.

The skewed stator core 10
As shown in FIG. 6, the magnetic metal piece 11 has inner teeth 14 which are inclined and inclined obliquely, with one upper end A being adjacent to the other lower end B along the circumferential direction between adjacent internal teeth. And very close, thereby smoothing the rotation of the motor. The skewed magnetic metal piece 11
Is the amount corresponding to the gap between the internal teeth 14, that is, when the magnetic pole of the rotor (not shown) passes the end (for example, A) of one internal tooth, the start of the next internal tooth adjacent thereto (For example, B) is preferable. Although FIG. 6 is shown in a simplified manner, actually, both sides of the skewed internal teeth 14 are magnetic metal pieces 11.
Has a step-shaped contour depending on the thickness of the staircase.

[0026]

As described above, according to the present invention,
By inserting a coil into a slot of the stator core in a state where the slot is straight without giving a twist to a metal piece constituting the stator core, the coil can be inserted using a conventional general coil insertion device. Further, by inserting the coil and twisting the stator core so that the metal pieces constituting the stator core are gradually displaced, the skewed stator can be manufactured mechanically with good productivity without manual operation.

[Brief description of the drawings]

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

FIG. 2 is a plan view of the manufacturing apparatus.

FIG. 3 is a side sectional view showing a left half of the manufacturing apparatus in section.

FIG. 4 is a sectional view showing an example of a coil insertion device used in the present invention.

FIG. 5 is a partially enlarged schematic view showing a state in which a coil is inserted into the stator core, as viewed from the inner circumference of the internal teeth of the stator core.

FIG. 6 is a partially enlarged schematic view showing a state where the stator core of FIG. 5 is twisted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Stator core 11 Magnetic metal piece 12 Notch 13 Slot 14 Internal tooth 20 Coil insertion device 40 Stator with skew 41 Substrate 42 Support post 43 Center post 51 Support shaft 52 Plate 52a Ridge 54 Air cylinder 55 Working rod

Claims (3)

[Claims] 1. A method for manufacturing a skewed stator, comprising: mounting a coil on a stator core that is formed by laminating magnetic metal pieces and twisted so that the metal pieces are gradually displaced.
After 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,
A method for manufacturing a skewed stator, wherein the metal pieces are twisted so as to gradually shift. 2. A notch matching each other is provided on an outer periphery of the metal piece, and after inserting the coil into a slot of the stator core, a plate is inserted along the notch matching the metal piece. 2. The method for manufacturing a skewed stator according to claim 1, wherein the metal pieces are twisted so as to be gradually shifted by tilting a plate with respect to the axis of the stator core. 3. A skew in which a coil is inserted into a slot of a stator core formed by laminating magnetic metal pieces having notches aligned with each other on the outer periphery, and then the metal pieces of the stator core are twisted so as to be gradually shifted. In a manufacturing apparatus for a stator, a center post that is inserted into an inner periphery of the stator core and supports the stator core in a state in which the metal pieces are rotatable relative to each other is provided. A plate that is pivotally supported so as to be tiltable with respect to the axis of the stator core, and that is inserted along a notch in which the metal piece is aligned.