HK1067460B - Stator for inner rotor motors and method of producing the same - Google Patents

Description

Stator of internal-rotation type motor and method of manufacturing the same

Technical Field

The present invention relates to a stator of an inward-turning motor in which coils are wound in series around a split core body that splits a plurality of stator cores, and the split core body is integrated into an annular structure.

Background

In recent years, stators in which coil processing is performed on a plurality of split core bodies and the split core bodies are arranged in a ring shape, and methods for manufacturing the same have become popular.

As an example of such a stator structure, those disclosed in Japanese patent laid-open Nos. 2000-358346 and 9-46979 are known. The following describes their structures with reference to fig. 22 to 23 and fig. 24 to 28.

As shown in fig. 22, the divided core body 201 insulated with the insulating materials 202 and 203 is held linearly for each of the poles, the a-phase coil 204 is continuously connected and wound for each of the poles by the transition wire 205, the B-phase coil 206 is continuously connected and wound for each of the poles by the transition wire 207, and the phases are integrated into a ring to form a stator. Similarly, as shown in fig. 23, the divided core body 201 insulated with the insulating materials 202 and 203 is held in a ring shape for each of the phases, the a-phase coil 204 is continuously connected and wound for each of the poles by the transition wire 205, and the B-phase coil 206 is continuously connected and wound for each of the poles by the transition wire 207, and these are integrated into a stator having a ring structure.

As shown in fig. 24 and 25, the divided teeth 301 are insulated with insulating materials 302 and 303, and a relay pin 305 serving as a winding start portion and a winding end portion of the coil 304 is provided to wind and mount the coil 304, and then the coil 304 is integrated into a ring shape to form a stator.

As shown in fig. 26 to 28, in the middle portion of the yoke 403 connecting the adjacent teeth 402, similarly, the number of the elongated holes 401 is divided into 4 stator cores equal to the number of the elongated holes, and the coil 405 is wound and mounted by the winding mounting machine 407 via the insulating material 404, but since the yoke 403 extends in the circumferential direction and is long in an arc shape with respect to the teeth 402, it is necessary to mount a special winding mounting guide or the like in the winding mounting operation of the coil 405.

Such a structure of the stator shown in fig. 22 and 23 has problems that it is difficult to manage the transition line 205 and that it takes time to assemble and integrate the split core bodies 201, each having the coils wound continuously in the number of poles, into a ring shape.

When the structures shown in fig. 24 and 25 are applied to the structures shown in fig. 26 to 28 as they are and coils 405 are wound and mounted on the teeth 402 of the divided core bodies 406, the yoke 403 is long in an arc shape, so that measures such as mounting of the winding and mounting guide a408 and the winding and mounting guide b409 are required, and the coils 405 are slid on the surfaces of the winding and mounting guide a408 and the winding and mounting guide b409 and are wound and mounted on the teeth 402, so that it is difficult to secure coil quality, and the teeth 402 and a part of the yoke 403 are formed as an integral divided structure, so that there is a problem that it is difficult to improve motor efficiency by restricting the rolling direction of the electromagnetic steel sheet as a core material.

Disclosure of Invention

The present invention has been made to solve the above problems, and an object of the present invention is to provide an inner-turning type motor stator and a manufacturing method thereof, which can easily manage a transition line and assemble and divide a core body with less labor. Further, an object of the present invention is to provide an inner rotation type motor stator and a method of manufacturing the same, which can improve a structure and a shape of a tooth portion or a yoke portion by winding a coil without mounting a special winding mounting guide to a stator core, and improve motor efficiency by limiting a rolling direction of an electromagnetic steel sheet.

In an inner-turn type motor stator, a method of manufacturing the inner-turn type motor stator includes a stator core including 4 first split core bodies and 4 second split core bodies, the first split core bodies having teeth integrally laminated with first yoke portions, the second split core bodies being laminated with second yoke portions sandwiched by the first split core bodies, 4 long holes being formed between the teeth of the first split core bodies, only the 4 first split core bodies being held while being fixed in a ring shape, 2-pole first phase coils and 2-pole second phase coils being wound in series while being alternately arranged in a row after an insulation treatment, the first phase coils and the second phase coils being connected by crossover lines, respectively, and the 4 second split core bodies being mounted between the first yoke portions of the first split core bodies to form a ring shape, and the first split core body is fixedly integrated, the outer peripheral part of the first split core body is formed into an arc shape, and the inner peripheral part of the first split core body is formed into an arc-shaped rotor opposite surface.

According to the present invention, since the a-phase coil and the B-phase coil are wound and mounted while the standard size of the motor stator is fixed in a ring shape, the split core body B can be mounted and integrated without moving the 4 teeth at all after the winding and mounting, and the transition line of each phase coil is not moved, so that the management is easy, the damage to the film of the winding and mounting of the stator and the transition line is prevented, the winding quality is ensured by preventing the wire breakage and the like, and the winding and mounting work of the stator and the mounting of the split core body a and the split core body B are easy, thereby providing the manufacturing method of the inner-turning type motor stator having a short working time.

The stator core is configured by 4 first split core bodies in which teeth and a first yoke portion are integrally laminated, and 4 second split core bodies in which second yoke portions are laminated and sandwiched by the first split core bodies, wherein 4 long holes are formed between the teeth of the first split core bodies, only 4 first split core bodies are fixed in a ring shape, and 2-pole first phase coils and 2-pole second phase coils are wound in series in a concentrated winding manner in an alternating arrangement, and the first phase coils and the second phase coils are connected by crossover wires, and 4 second split core bodies are integrally fixed between the 4 first yoke portions of the 4 first split core bodies.

According to the present invention, the split core body b is formed linearly in the shape of the outer diameter and the inner diameter in the longitudinal direction, so that the efficiency of the motor can be improved and the core material can be reduced compared to the case of forming the arc-shaped split core body. Since the outer peripheral portion of the split core body a is formed in an arc shape and the inner peripheral portion thereof is formed in an arc shape as a rotor facing surface, only the split core body a is fitted in contact with the inner diameter portion of the motor case, and the inner diameter accuracy of the stator is secured.

Further, the present invention provides an internal rotation type motor stator, wherein a stator core is composed of 4 first split core bodies and 4 second split core bodies, the first split core bodies are integrally laminated with a first yoke portion by teeth, the second split core bodies are laminated with a second yoke portion sandwiched by the first split core bodies, 4 long holes are formed between the teeth of the first split core bodies, only the 4 first split core bodies are fixed in a ring shape, a first phase coil of 2 poles and a second phase coil of 2 poles are wound in series in a concentrated winding manner in an alternately aligned manner, the first phase coil and the second phase coil are connected by a crossover line, respectively, and the 4 second split core bodies are fixed in a ring shape by being integrally fixed between the first yoke portions of the 4 first split core bodies, the inner diameter portion of the housing is fitted and held with only the arc-shaped portion on the outer diameter side of the first split core body as it is, and a gap is formed between the outer diameter side of the 4 second split core bodies and the inner diameter portion of the housing.

The present invention also provides a method of manufacturing an internal-turn motor stator according to claim 12, wherein the stator core is composed of 4 first split core bodies and 4 second split core bodies, the first split core bodies are integrally laminated with a first yoke portion by a tooth portion, the second split core bodies are laminated with a second yoke portion sandwiched by the first split core bodies, 4 long holes are formed between the tooth portions of the first split core bodies, only 4 first split core bodies are fixed in a ring shape, 2-pole first phase coils and 2-pole second phase coils are wound in series in an alternating arrangement by concentrated winding, the first phase coils and the second phase coils are connected by intermediate lines, and then the 4 second split core bodies are fixed and integrated between the first yoke portions of the 4 first split core bodies to form a yoke portion The first phase coil or the second phase coil is wound in series, and the second split core body is mounted in the axial direction of the motor with respect to the first split core body arranged in a ring shape.

Drawings

Fig. 1 is a perspective view showing the arrangement of coils of 4 divided core bodies a of a stator core of an internal-rotation type motor according to a first embodiment of the present invention when the coils are wound;

fig. 2 is a front view showing a stator core of the in-phase motor;

fig. 3 is a perspective view showing 4 divided core plates b of a stator core of a in-phase motor;

fig. 4 is a perspective view showing a split core plate a of a stator core of the in-phase motor;

fig. 5 is a perspective view showing 4 divided core plates b of a stator core of a in-phase motor;

fig. 6 is a partial perspective view showing a state in which a coil is wound and mounted on a split core body a of the in-turn motor;

fig. 7 is a front view showing a state in which a coil is wound around a split core body a of the in-turn motor;

fig. 8 is a front view showing a stator of the in-rotation type motor;

fig. 9 is a front view of a stator core in which the split surface shapes of a split core body a and a split core body b of the internal rotation type motor of the present invention are convex;

fig. 10 is a perspective view showing a split core body b of the in-phase rotation type motor;

fig. 11 is a front view showing a stator core of an internal rotation type motor according to a second embodiment of the present invention;

fig. 12 is a perspective view showing a split core body a of the in-phase motor stator;

fig. 13 is a perspective view showing a split core plate b of the in-phase motor stator;

fig. 14 is a front view showing a stator of the in-rotation type motor;

fig. 15 is a front view showing a state where an insulating material is attached to a split core body a of a stator of the in-phase motor;

fig. 16 is a front view, partly in section, showing a state in which a coil is wound around a split core body a of the in-turn motor;

fig. 17 is a front view showing a state in which the outer peripheral portion of the insulating material of the split core body a of the in-turn type motor is deformed into an arc shape;

fig. 18 is a front view showing a state in which 4 split core bodies a of the in-turn motor are arranged in a ring shape;

fig. 19 is a front view, partly in section, showing a state in which a split core body a and a split core body b of the in-phase motor are combined;

fig. 20 is a front view, partially in section, showing a state in which a stator core of the in-turn motor is press-fitted into a housing;

fig. 21 is a front view showing a stator core of the in-phase motor;

fig. 22 is a front view showing a state in which split core bodies a of a conventional internal rotation type motor are arranged in a straight line and a coil is wound and mounted;

fig. 23 is a front view showing a state in which split core bodies a of the in-turn motor are arranged in a ring shape and a coil is wound and mounted;

fig. 24 is a perspective view showing a state in which coils are wound around teeth of a stator of a current internal rotation type motor;

FIG. 25 is a plan view showing the same stator portion;

fig. 26 is a plan view of a stator of a still further internal rotation type motor;

FIG. 27 is a plan view showing a complete division of the stator;

fig. 28 is a plan view showing a state in which a coil is wound and mounted on a divided portion of the stator.

Detailed Description

An embodiment of the present invention will be described with reference to fig. 1 to 21.

(first embodiment)

As shown in fig. 1 to 10, the manufacturing method is as follows: a stator core 1 having 4 elongated holes 15 is divided into 4 divided core bodies a4 in which teeth 2 are integrated with a yoke 3-1 and 4 divided core bodies b5 of the yoke 3-2, 8 in total, and the divided core bodies a2 are arranged on the outer periphery of a rotor hole 6 so that the teeth 3-1 are each in a radial shape at a position spaced from a standard inner and outer diameter and the same as when the stator 14 is completed. Then, the opposed split core bodies a4 are connected by concentrated winding after insulation treatment with the a-phase coil 7 by the crossover wire 8a, and 2-pole portions (pole portions) are continuously wound in series, and similarly, the remaining split core bodies a4 are connected by concentrated winding after insulation treatment with the B-phase coil 9 by the crossover wire 8B, and 2-pole portions (pole portions) are continuously wound in series, so that after forming the 2 a-phase coil wound assemblies 10 and the 2B-phase coil wound assemblies 11 at positions separated from them by 90 degrees in electrical angle, the 4 split core bodies B5 having linear outer diameter side shapes and inner diameter side shapes in the longitudinal direction split by the yoke portion 3 are respectively fitted into the gaps between the split core bodies a4 and the split core bodies a4 and are fixed and integrated with the constant size, thereby assembling the ring-shaped stator 14.

In this manufacturing method, the winding and mounting operation of the 2-pole a-phase coil 7 and the winding and mounting operation of the 2-pole B-phase coil 9 are performed simultaneously.

In this manufacturing method, the a-phase coil 7 or the B-phase coil 9 is wound and mounted in series, and the divided core body B5 having a structure in which a truncated cone shape or a convex shape whose tip is thin in the inner diameter direction or a shape combining these shapes is formed on the divided core bodies a4 of 4 annularly arranged in the standard size of the stator 14 is mounted from the outer diameter direction to the inner diameter direction.

A stator core 1 having 4 elongated holes 15 is divided into 4 divided core bodies a4 in which teeth 2 are integrated with yoke 3-1 and 4 divided core bodies b5 in which yoke 3-2 is integrated, 8 divided core bodies a2 in total are arranged on the outer periphery of a rotor hole 6 so that the teeth 3-1 are each in a radial shape, and the positions thereof are kept at regular intervals from the regular inner and outer diameter dimensions and are the same as those in the case of completion of a stator 14. Then, the a-phase coil 7 is connected by the crossover wire 8a by concentrated winding after the insulation treatment and 2 pole portions (pole portions) are continuously wound in series and mounted on the opposite split core body a4, and similarly, the B-phase coil 9 is connected by the crossover wire 8B by concentrated winding after the insulation treatment and 2 pole portions (pole portions) are continuously wound in series and mounted on the remaining split core body a4, and in the case of forming 2 a-phase coil winding assemblies 10 and 2B-phase coil winding assemblies 11 at positions separated from the same by 90 degrees in electrical angle, 4 split core bodies B5 having a linear outer diameter side shape and an inner diameter side shape in the longitudinal direction split by the yoke portion 3 are fixedly mounted between the split core body a4 and the split core body a4 and are integrated into a ring shape, thereby constituting the stator 14.

Further, 4 split core bodies b5 each having a truncated cone shape or a convex shape with a narrow tip in the inner diameter direction or a shape combining these are arranged in the gap between the 4 split core bodies a4 arranged annularly in the standard size of the stator 14.

The split core body b5 has a structure formed by punching and laminating, with the longitudinal direction thereof aligned with the rolling direction in the electromagnetic steel sheet manufacturing process.

The split core body b5 is a laminated oriented steel sheet, and the longitudinal direction thereof is set to coincide with the direction in which the oriented steel sheet is easily magnetized.

Also, as shown in fig. 6, the transition line 8a of the a-phase coil 7 is held by the outer peripheral surface side of the upper edge portion 12B-1 provided on the inner diameter side of the B-phase coil insulator 12B or the holding mechanism 13B-1 provided thereon, and the transition line 8B of the B-phase coil 9 is held by the outer peripheral surface side of the lower edge portion provided on the inner diameter side of the a-phase coil insulator 12a or the holding mechanism 13a-1 provided therebelow.

As shown in fig. 7, the transition line 8a of the a-phase coil 7 is disposed on the load side of the stator core 1, and the transition line 8B of the B-phase coil 9 is disposed on the counter load side, or the transition line 8a of the a-phase coil 7 is disposed on the counter load side of the stator core 1, and the transition line 8B of the B-phase coil 9 is disposed on the load side.

In this way, according to the internal rotation type motor stator and the manufacturing method thereof of the first embodiment of the present invention, only 4 split core bodies a4 are arranged in a ring shape and held in a standard size when the stator 14 is completed, in the same manner as the arrangement of the stator 14, the coil 7 of the phase a of 2 pole or the coil 9 of the phase B of 2 pole is wound in series by a winding machine (not shown), and the coil 7 of the phase a and the coil 9 of the phase B are connected by the crossover wire 8a or 8B and wound in series, so that the length of the crossover wires 8a, 8B is not adjusted when the stator 14 is assembled, the split core body a4 is held in the same manner as the standard inner and outer diameter size when the stator is completed, and there is no need to move from the coil winding installation to the installation of the split core body B5, so that the crossover wire management is easy and the damage to the stator 14A phase coil 7 and the phase B coil 9 and each crossover wire 8a can be prevented, 8b coating and preventing disconnection, and can assemble the stator 14 with less labor, thereby facilitating the manufacturing method.

Since the winding and mounting operation of the a-phase coil 7 and the winding and mounting operation of the B-phase coil 9 are simultaneously performed for the 4 split core bodies a4, the series winding and mounting operation of the coils can be performed in a very short time. Since the split core body b is formed in a tapered shape or a convex shape or a shape combining these in the radial direction, the split core body b5 is pressed in a flat manner from the outer diameter direction to the inner diameter direction in the gap between the 4 split core bodies a annularly arranged in the standard size of the stator 14, whereby the mounting can be performed, and the stator 14 can be easily mounted.

Further, only the 4 split cores a4 are arranged in a ring shape and held in the same standard size as the arrangement of the stator 14 when the stator 14 is completed, and the 2-pole a-phase coil 7 or the 2-pole B-phase coil 9 is wound in series by a winding machine (not shown), and the a-phase coil 7 and the B-phase coil 9 are connected by the crossover wire 8a or 8B and wound in series, so that the length of the crossover wires 8a and 8B is not adjusted and the split core a4 is not moved when the assembly of the stator 14 is completed, and therefore, the crossover wire management is easy, the damage to the films of the stator 14A-phase coil 7 and the B-phase coil 9 and the respective crossover wires 8a and 8B can be prevented, and the wire breakage can be prevented, and the assembly of the stator 14 can be realized with a small amount of labor.

Further, since the split core b5 having a tapered or convex shape toward the inner diameter direction or a shape combining the tapered and convex shapes is disposed in the gap between the 4 split core bodies a4 annularly disposed in the standard size of the stator 14, the split core b can be easily assembled.

Further, the split core body b5 is punched and laminated in the longitudinal direction thereof in accordance with the rolling direction in the electromagnetic steel sheet manufacturing process, so that the magnetic path length of the split core body b23 is shortened, and the motor efficiency is improved by effectively utilizing the excellent magnetic characteristics in the rolling direction of the electromagnetic steel sheet.

Further, since the split core body b5 is a laminated oriented steel sheet and the longitudinal direction is set to coincide with the easy magnetization direction of the oriented steel sheet, the excellent magnetic characteristics in the rolling direction of the electromagnetic steel sheet can be utilized favorably, and the motor efficiency can be greatly improved.

Since the transition line 8a of the a-phase coil 7 and the transition line 8B of the B-phase coil are held at positions separated from the coils, the possibility of a thinning defect or the like due to damage to the transition lines 8a and 8B can be reduced.

Since the transition line 8a of the a-phase coil 7 and the transition line 8B of the B-phase coil are arranged on the load side and the anti-load side, respectively, with the stator core 1 interposed therebetween, the possibility of contact between the transition lines 8a and 8B and the winding start line (not shown), the winding end line (not shown), and the like of the coils of the respective phases can be reduced, and the coil quality can be improved.

(second embodiment)

As shown in fig. 11 to 21, the stator core 21 is divided into 4 divided core bodies a22 and 4 divided core bodies B23, the total number of which is 8, the divided core bodies a22 are arranged on the outer periphery of the rotor hole 24 so that the teeth 25 are linear or substantially radial, the a-phase coil winding attachment 27 of the 2 a-phase coil 26 wound and attached and the B-phase coil winding attachment 29 of the B-phase coil 28 wound and attached at a position spaced apart from the a-phase coil winding attachment 27 by 90 degrees in electrical angle, and the divided core bodies B23 divided by the yoke portion 30 are alternately arranged in a ring shape to constitute the stator 31. In the coil winding installation, the stator core 21 is divided into 8 pieces, the insulating material is attached to the 4 divided core bodies a22, the a-phase coil 26 or the B-phase coil 28 is wound in series by a winding machine (not shown) to form 2 a-phase coil winding installation bodies 27 or 2B-phase coil winding installation bodies 29, and after the winding installation, the outer periphery 32a of the insulating material 32 is pressed and deformed in the inner radial direction to be integrated along the inner periphery of the divided core body B23, and the 4 long holes 33 are formed and integrated into a ring shape. Next, the inner diameter portion of the housing 34 is held and fitted only at the arc-shaped portions on the outer diameter side of the 4 split core bodies a22, which contributes to securing the roundness of the inner diameter of the stator, and the outer diameter sides of the 4 split core bodies b23 are not in contact with the inner diameter portion of the housing 34, thereby constituting the stator 31 in which the gap 35 is formed.

Further, 4 ring-shaped divided core bodies a4 are wound in series around the a-phase coil 7 or the B-phase coil 9, and the divided core body B5 is mounted from the upper side or the lower side in the axial direction of the motor.

As described above, according to the internal rotation type motor stator according to embodiment 2 of the present invention, when the a-phase coil 26 or the B-phase coil 28 is wound and mounted in series on the split core body a22 by the winding machine (not shown), the split core body B23 is removed and the coil is wound and mounted on the separate split core body a22, and the winding machine can perform winding and mounting by a simple winding motion without mounting a complicated coil guide or the like, so that the coil can be wound and mounted without sliding on the surface of the coil guide, and occurrence of troubles such as damage to the coil film or breakage of the coil film can be prevented, and coil quality can be ensured.

Further, since the outer diameter sides of the 4 split core bodies b23 do not contact the inner diameter portion of the case 34, it is not necessary to precisely form the outer peripheral shape of the split core body b23, and a low-cost mold can be used, and the cost can be reduced.

Further, since the split core b23 is attached to the 4 split cores a22 around which the coil is wound from the upper or lower axial direction of the motor, the shapes of the split surfaces of the split core a22 and the split core b23 can be freely set, and can be selected to have a shape that enlarges the contact area, thereby reducing the magnetic resistance of the split surfaces.

Possibility of industrial utilization

The invention provides a split core type stator in which a coil can be easily wound and mounted and can be assembled with a small amount of time and a method for manufacturing the same. In the present invention, the coil is wound and mounted without mounting a special coil guide, so that a coil with high reliability can be obtained. The loss of the stator can be reduced by using the divided core punched out from the electromagnetic steel sheet in the rolling direction.

Claims (13)

1. A method for manufacturing a stator of an internal rotation type motor, wherein a stator core is composed of 4 first split core bodies and 4 second split core bodies, the first split core bodies are integrally laminated with a first yoke portion by teeth, the second split core bodies are laminated by a second yoke portion sandwiched by the first split core bodies, 4 long holes are formed between the teeth of the first split core bodies, only the 4 first split core bodies are fixed and held in a ring shape, after an insulation treatment, a first phase coil of 2 poles and a second phase coil of 2 poles are wound in series in an alternating arrangement in a manner of concentrated winding, the first phase coil and the second phase coil are connected by a crossover wire, and then the 4 second split core bodies are mounted between the first yoke portions of the first split core bodies to form a ring shape, and the first split core body is fixedly integrated, the outer peripheral part of the first split core body is formed into an arc shape, and the inner peripheral part of the first split core body is formed into an arc-shaped rotor opposite surface.

2. The method of manufacturing an inside-turning motor stator according to claim 1, wherein the second split core body has a linear shape on an outer diameter side and an inner diameter side in a longitudinal direction.

3. The manufacturing method of an inside rotation type motor stator according to claim 1, wherein the winding installation operation of the 2-pole first phase coil and the winding installation operation of the 2-pole second phase coil are simultaneously performed.

4. The method of manufacturing an inner rotary motor stator according to claim 1, wherein the first phase coil or the second phase coil is wound in series, and 4 first split core bodies are mounted, each of which has a shape of a truncated cone with a narrow tip in an inner diameter direction, a convex shape, or a combination thereof, in an outer diameter direction of the motor stator.

5. An internal rotation type motor stator, wherein a stator core is composed of 4 first split core bodies and 4 second split core bodies, the first split core bodies are integrally laminated with a first yoke portion by teeth, the second split core bodies are laminated by a second yoke portion sandwiched by the first split core bodies, 4 long holes are formed between the teeth of the first split core bodies, only 4 first split core bodies are fixed in a ring shape, a first phase coil of 2 poles and a second phase coil of 2 poles are wound in series in a concentrated winding manner in an alternately aligned manner, the first phase coil and the second phase coil are connected by a crossover wire, and 4 second split core bodies are fixed between the first yoke portions of the 4 first split core bodies and integrated into a ring shape.

6. The internal rotation type motor stator according to claim 5, wherein the second split core body is formed in a linear shape having an outer diameter side shape and an inner diameter side shape in a longitudinal direction.

7. The internal rotation type motor stator according to claim 5, wherein the first phase coil or the second phase coil is wound and mounted in series, the second split core body is mounted in the outer diameter direction with respect to 4 first split core bodies arranged in a ring shape, and the split surfaces of the first split core body and the second split core body are formed in a shape in which the second split core body is formed in a tapered trapezoidal shape or a convex shape or a combination of these shapes with respect to the inner diameter direction for easy mounting.

8. The inner rotating type motor stator according to claim 5, wherein the 4 second split core bodies are punched and laminated in a longitudinal direction thereof in a rolling direction of the electromagnetic steel sheet manufacturing process.

9. The inner rotating type motor stator according to claim 5, wherein 4 second split cores are formed by laminating grain-oriented magnetic steel sheets, and a longitudinal direction of the second split cores is set to a direction in which the grain-oriented magnetic steel sheets are easily magnetized.

10. The internal rotation type motor stator according to claim 5, wherein the transition line of the first phase coil is held by a holding mechanism provided on an outer peripheral surface of or above an upper side edge portion provided on an inner diameter side of the insulator for the second phase coil, and the transition line of the second phase coil is held by a holding mechanism provided on an outer peripheral surface of or below a lower side edge portion provided on an inner diameter side of the insulator for the first phase coil.

11. The inner rotation type motor stator as claimed in claim 5, wherein a transition line of a first phase coil is disposed at one side of the stator core, and a transition line of a second phase coil is disposed at the other side of the stator core.

12. An internal rotation type motor stator, wherein a stator core is composed of 4 first divided core bodies and 4 second divided core bodies, the first divided core bodies are integrally laminated with a first yoke portion by teeth, the second divided core bodies are laminated by a second yoke portion sandwiched by the first divided core bodies, 4 long holes are formed between the teeth of the first divided core bodies, only 4 first divided core bodies are fixed in a ring shape without change, a first phase coil of 2 poles and a second phase coil of 2 poles are wound in series in a concentrated winding manner in an alternating arrangement, the first phase coil and the second phase coil are connected by a crossover wire, respectively, 4 second divided core bodies are fixed in a ring shape between the first yoke portions of 4 first divided core bodies and integrated into a ring shape, only an arc-shaped portion on the outer diameter side of the first divided core bodies is embedded in an inner diameter portion of a housing as it is, and only an arc-shaped portion on the outer diameter side of the first divided core bodies is embedded in an inner diameter portion of the housing without change And a gap is formed between the outer diameter side of the 4 second split core bodies and the inner diameter portion of the housing.

13. A method of manufacturing an inner-turning type motor stator according to claim 12, wherein the stator core is constituted by 4 first split core bodies and 4 second split core bodies, the first split core bodies are formed by laminating teeth portions and first yoke portions integrally, the second split core bodies are formed by laminating second yoke portions sandwiched by the first split core bodies, 4 long holes are formed between the teeth portions of the first split core bodies, only the 4 first split core bodies are fixed in a ring shape, the first phase coils of 2 poles and the second phase coils of 2 poles are wound in series in a concentrated winding manner while being alternately arranged, the first phase coils and the second phase coils are connected by transition lines, and then the 4 second split core bodies are fixed between the first yoke portions of the 4 first split core bodies and integrated into a ring shape, the first phase coil or the second phase coil is wound in series, and the second split core body is mounted in the axial direction of the motor with respect to the first split core body arranged in a ring shape.