JP2003199270A - Stator core of rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simply assemble at a time in a state that each core element is arranged in a circular form, in a stator core of a rotating electric machine of an outer rotor type, which is so arranged as to assemble a plurality of core elements in a body by coupling the core elements divided into magnetic pole units composed of yokes, a magnetic pole, and a claw, with one another at the yokes. <P>SOLUTION: This stator core is provided with a downward projecting arm on one side of the yoke in each core element divided, and an upward projecting arm on the other side, and each downward projecting arm and upward projecting arm in opposition in adjacent core elements can be coupled shiftably with each other, having a specified range in the circumferential direction. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer rotor type stator core of a rotary electric machine, and more particularly to a stator core of a rotary electric machine having a split structure.

[0002]

2. Description of the Related Art As shown in FIG. 8, an outer rotor type stator core of a conventional rotary electric machine is an integral type in which a yoke 14 and each magnetic pole 15 are integrally formed.

In such an integral type stator core, a coil is wound around each magnetic pole 15 while a winding jig is passed through the gap d between the claws 16 of each magnetic pole 15.

Conventionally, as shown in FIG. 9, a yoke portion 1 and a magnetic pole portion 2 in an outer rotor type stator core are used.
And a core element 4 for each magnetic pole composed of a claw portion 3,
A downward hook claw 17 is provided on one side of the yoke portion 1 of each core element 4, and an upward hook claw 18 is provided on the other side thereof, so that each adjacent core element is provided with a downward hook claw 17 and an upward hook claw 18. There is one in which a plurality of core elements are integrally assembled in a circular shape by being coupled to each other by engagement with (see Japanese Patent Application Laid-Open No. 2000-50583).

As prior applications, FIGS.
As shown in FIG. 2, a concave groove 19 is formed on one side of the yoke portion 1 of each of the divided core elements 4, and the groove 1 is formed on the other side thereof.
Providing two split projections 20 that fit in 9 respectively,
With the core elements 4 arranged side by side, the protrusions 20 on the other side are provided in the grooves 19 on the one side of the yoke portion 1 of each adjacent core element 4.
There is one that can be assembled integrally by fitting by using the elasticity of the two cracks (see Japanese Patent Application No. 2000-104207).

[0006]

The problem to be solved is that in the conventional stator core, since it is an integral type, a large steel plate material for punching out the laminated plates is required, and a large amount of punched residue is left, resulting in a high yield. Is getting worse.

Further, in the conventional integral type stator core,
It is necessary to wind a coil around each magnetic pole 15 while passing a winding jig through the gap d between the claws 16 of each magnetic pole 15, so that the workability of winding the coil is poor, and the coil is placed on the magnetic pole 15 part. There is a problem that it is difficult to wind densely without a gap, and the output efficiency of the rotating electric machine is poor.

Since a relatively wide gap d for securing a space for the winding jig to pass through is required between the claws 16 of each magnetic pole 15, the magnetic flux distribution characteristic of the air gap becomes poor, and the rotation occurs. There is a problem that the output efficiency of the electric machine is reduced.

Further, as shown in FIG. 9, the stator core of the outer rotor type rotary electric machine is divided into a plurality of core elements 4, and each adjacent core element 4 is hooked downward 17 and hooks 18 upward. When the plurality of core elements 4 are integrally assembled in a circular shape by being coupled to each other by engagement with each other, each core element 4 in the state where the downward hook claw 17 and the upward hook claw 18 are engaged with each other. Since 4 can not be moved in the circumferential direction, it is impossible to integrally assemble the core elements arranged in a circle at one time.

Further, as shown in FIGS. 10 to 12,
In a state where the divided core elements 4 are arranged in a circle, a force F is applied inward from the outer periphery to form a protrusion 20 on the other side in the groove 19 on one side of the yoke portion 1 of each adjacent core element 4. The one that is assembled integrally by fitting by utilizing the elasticity due to the two cracks requires the external force F for the press-fitting. And groove 1
Since the two projections 20 that are fitted inside 9 are cracked, a gap is created in the fitted portion, and the magnetic resistance of the yoke portion in the integrally assembled stator core is increased.

[0011]

SUMMARY OF THE INVENTION The present invention improves the yield of products, improves the workability of coil winding, and allows the coil to be wound tightly, and maximizes the number of claws on each magnetic pole. In order to improve the magnetic flux distribution characteristics of the air gap and to improve the output efficiency of the rotary electric machine by increasing the size of the yoke to narrow the gap between the claws, the yoke in the outer rotor type stator core is improved. The core elements, which are divided into magnetic pole units each including the portion, the magnetic pole portion, and the claw portion, are coupled to each other at the yoke portion so that the plurality of core elements are integrally assembled in a circular shape.

In this case, in particular, in the present invention, the assembled core elements can be easily assembled at once without applying any external force for press fitting in a state where they are arranged in a circle. In order to achieve the above, the lower protruding arm portion is provided on one side of the yoke portion of each core element, and the upper protruding arm portion is provided on the other side thereof, so that the opposing lower protruding arm portion and upper protruding arm portion of the adjacent core element are provided. And the core elements are movably coupled to each other in the circumferential direction within a predetermined range, and then the core elements are assembled together in a circular arrangement.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a stator core of a rotary electric machine according to the present invention is divided into core elements 4 of a magnetic pole unit composed of a yoke portion 1, a magnetic pole portion 2 and a claw portion 3.

The core element 4 is provided with a downward protruding arm portion 5 on the upper side on one side of the yoke portion 1 and an upper protruding arm portion 6 on the lower side on the other side.

A notch 7 is formed in the downward protruding arm portion 5.
However, notches 8 are formed in the upper projecting arm portions 6, respectively, and as shown in FIG. 2, the facing lower projecting arm portions 5 and the upper projecting arm portions 6 of the adjacent core elements 4 are adjacent to each other. It is configured to be movably engaged with a predetermined range D in the direction (circumferential direction).

Then, as shown in FIG. 3 and FIG.
A predetermined number of core elements 4 are arranged in a circle in a state in which the lower protruding arm 5 and the upper protruding arm 6 are movably engaged in the circumferential direction, and the center of the circle By moving each core element 4 so as to make the circle small by applying a small force f toward, the downward projecting arm portion 5 and the upward projecting arm portion 6 between adjacent core elements 4 are brought into a coupled state. As a result, the stator core 9 can be integrally assembled at once.

At this time, as shown in FIG. 11, in a state where the divided core elements 4 are arranged in a circle, a large force F is applied inward from the outer periphery to the yoke portion 1 of each adjacent core element 4. Two split projections 2 on the other side in the groove 19 on one side
Compared with the conventional one in which 0 is press-fitted and integrally assembled, press-fitting for engaging the downward projecting arm portion 5 and the upward projecting arm portion 6 between adjacent core elements 4 is not necessary, and the stator core As a result, it is possible to easily perform the integral assembly as the item 9, and the work is dramatically improved.

In the stator core having such a divided structure, before the core elements 4 are integrally assembled, as shown in FIG. 5, the magnetic pole portion 2 and the claw portion 3 of the core element 4 are previously formed. The bobbin 10 is attached to the portion, and the coil 11 is wound around the bobbin 10.

However, by adopting such a winding means for the coil 11, it is possible to wind the coil 11 with good workability, and also to easily and densely wind the coil 11. Become.

Further, since it is not necessary to secure a sufficient gap for the winding jig to pass between the respective claw portions 3 in the integrally assembled state, the claw portions 3 of the core element 4 can be set to the maximum. The magnetic flux distribution characteristic of the air gap is improved.

Therefore, the coil 11 can be tightly wound without a gap, and the magnetic flux distribution characteristic of the air gap can be improved by maximizing the claw portions 3 of the core element 4, thereby synergistically rotating. The output efficiency of the electric machine is improved, and the size and weight of the electric machine can be effectively reduced.

Further, in the present invention, as shown in FIG. 6, when the retainer 13 is attached to both sides of the inner peripheral portion of the stator core 9 in which a plurality of core elements 4 are integrally assembled in a circular shape, each adjacent core element 4 is attached. A hole 12 formed in a connecting portion between the lower protruding arm 5 and the upper protruding arm 6 between the elements 4.
The teeth of the retainer 13 are embedded in each (see FIG. 2).

FIG. 7 shows the structure of the retainer 13. In the figure, 131 is a tooth of the retainer 13. Also, 1
Reference numeral 32 denotes a press-fitting hole for a collar, into which a collar (not shown) is press-fitted so as to come into contact with the inner peripheral surface of the integrally assembled stator core 9.

[0024]

As described above, the stator core of the rotary electric machine according to the present invention is of the outer rotor type, and the yoke portion,
A core element divided into magnetic pole units composed of a magnetic pole portion and a claw portion is mutually coupled at a yoke portion so that a plurality of core elements are integrally assembled in a circular shape, which improves the yield of the product and the coil. The winding workability is improved so that the coil can be wound tightly, and the magnetic flux distribution characteristics of the air gap are improved by maximizing the claws of each magnetic pole to narrow the gap between the claws. In addition, the output efficiency of the rotary electric machine can be improved.

In this case, particularly, in the present invention, a downward projecting arm portion is provided on one side of the yoke portion of each core element, and an upward projecting arm portion is provided on the other side thereof, so that the opposing downward projecting portions of adjacent core elements are provided. By allowing the arm part and the upward protruding arm part to be movably connected to each other in the circumferential direction within a predetermined range, it is easy to assemble the divided core elements in a circular shape at a time. It has the advantage of being able to

[Brief description of drawings]

FIG. 1 is a front view showing a core element used for a stator core of a rotary electric machine according to the present invention.

FIG. 2 is a front view showing a state where adjacent core elements are coupled to each other by an upper protruding arm portion and a lower protruding arm portion.

FIG. 3 is a front view showing a state where a plurality of core elements are arranged in a circle when a plurality of core elements are integrally assembled by applying a force from the periphery to form a stator core.

FIG. 4 is a front view showing a stator core of a rotary electric machine according to the present invention formed by integrally assembling a plurality of core elements.

FIG. 5 is a front cross-sectional view showing a state in which a coil is wound around a core element via a bobbin.

FIG. 6 is a front view showing a state in which a retainer is attached to the stator core of the present invention.

FIG. 7 is a side view of a retainer attached to the stator core of the present invention.

FIG. 8 is a partially cutaway front view showing a conventional integral type stator core.

FIG. 9 is a front view showing an example of a coupled state of adjacent core elements in a conventional split type stator core.

FIG. 10 is a front view showing a core element in a conventional split type stator core.

FIG. 11 is a front view showing a state in which the core elements shown in FIG. 11 are arranged in a plurality of circles before coupling.

FIG. 12 is a front view showing a state after the core elements shown in FIG. 11 are arranged in a plurality of circles and combined.

[Explanation of symbols]

1 Yoke part 2 magnetic pole 3 nails 4 core elements 5 downward protruding arm 6 Upper protruding arm 12 Retainer insertion hole 13 retainer

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5H002 AA01 AA06 AA07 AB01 AB05                       AC08 AD08 AE07 AE08                 5H604 AA08 BB15 CC05 CC16 PB03                       QB17                 5H615 AA01 BB01 BB02 BB14 PP01                       PP07 PP10 QQ19 SS03 SS10

Claims (2)

[Claims] 1. An outer rotor type stator core, wherein core elements divided into a magnetic pole unit composed of a yoke portion, a magnetic pole portion and a claw portion are coupled to each other at a yoke portion, and a plurality of core elements are integrally assembled in a circular shape. In the stator core of the rotating electric machine according to claim 1, each core element has a downwardly projecting arm portion on one side of the yoke portion and an upwardly projecting arm portion on the other side thereof. And the upper protruding arm portion are movably coupled to each other in a circumferential direction within a predetermined range, and the core elements are integrally assembled in a circularly arranged state. Stator core of rotating electric machine. 2. A retainer tooth embedding hole is formed in a connecting portion between the lower protruding arm and the upper protruding arm, and
The stator core of a rotary electric machine according to claim 1, wherein retainers are attached from both sides of a core assembly in which a plurality of core elements are integrally assembled in a circular shape.