JPH09312943A - Stator of rotating electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized and efficient stator by providing a guide hole at the center of the projection of a slot formed between the adjacent teeth from the inner face of a stator core. SOLUTION: A ring-shaped stator core 1 made by stacking thin steel plates is provided with a plurality of teeth 11 projected inward radially at regular intervals in circumferential direction. Then, in the case of setting up a rotating electric machine, a rotor 5 fixed to a shaft 4 is inserted into the stator 10, and brackets 6 on load side and antiload side are attached to both ends in axial direction of the stator 10, and the shaft 4 is supported with a bearing 61. Moreover, a stud bolt 7 is passed through the through hole 62 of the bracket and the guide hole 14, and two brackets 6 and a stator 10 are fastened and fixed with screws. In this case, the stud bolt 7 never gets out of the stator core 1, and the projection 13 never gets out of the periphery of the stator core 1 either, so the required space becomes small. As a result, a small-sized and efficient stator can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator of a frameless rotating electric machine having a stator core formed by laminating thin steel plates.

[0002]

2. Description of the Related Art Conventionally, a stator of a frameless rotating electric machine having a stator core formed by laminating thin steel plates is, for example, as shown in FIG. 4, at equal intervals in the circumferential direction of a ring-shaped stator core 1. A plurality of teeth 11 radially protruding inward are provided, and a slot 12 for mounting the armature coil 2 is formed between adjacent teeth 11. The armature coil 2 is wound around a bobbin 3 having a rectangular cross section in advance, and the bobbin 3 is inserted into each tooth 11 and mounted in the slot 12. A plurality of protrusions 15 are provided on the outer periphery of the stator core 1 at predetermined intervals in the circumferential direction, and the protrusions 15 are provided with guide holes 14 penetrating in the axial direction, and together with the stator core 1, both ends of the stator core 1 are provided. A through bolt for fixing the provided bracket is inserted.

[0003]

However, in the above-mentioned prior art, since the protrusion is provided on the outer circumference of the stator core 1, the actual volume of the motor is increased, and a large arrangement space must be secured. was there. Further, when bobbins having a rectangular cross section are mounted on the radially projecting teeth 11, in order to avoid mechanical interference between the adjacent bobbins 3, one side width of the bobbin 3 is set to the slot 1.
Since the width of the slot 12 becomes larger in the vicinity of the root of the tooth 11 than in the opening of No. 2, there is a problem that a wasteful space is formed between the adjacent bobbins 3. SUMMARY OF THE INVENTION It is an object of the present invention to provide a compact and efficient stator for a rotating electric machine by eliminating the protrusion provided on the outer periphery of the stator core.

[0004]

In order to solve the above-mentioned problems, the present invention provides a plurality of teeth which are radially inwardly projected at equal intervals in the circumferential direction and are formed by laminating thin steel plates. Of a ring-shaped stator core, an armature coil wound around the teeth, a bobbin with a rectangular cross section accommodating the armature coil, and a guide hole penetrating in the axial direction of the stator core. In the stator, the guide hole is provided in a central portion of a protruding portion protruding from an inner surface of the stator core into a slot formed between the adjacent teeth. The inner surface of the stator core is a flat surface extending perpendicularly to the side surface of each tooth, and the outer surface of the stator core is a flat surface parallel to the inner surface.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 is a front sectional view showing an embodiment of the present invention, and FIG. 2 is a side sectional view taken along the line AA. In the figure, 1 is a ring-shaped stator core formed by laminating thin steel plates, and is provided with a plurality of teeth 11 radially inwardly protruding at equal intervals in the circumferential direction. Reference numeral 2 denotes an armature coil, which is mounted in a slot 12 formed between adjacent teeth 11. 3 is a bobbin having a rectangular cross section around which the armature coil 2 is wound, and the inner side surface 31 of the bobbin 3 around which the armature coil 2 is wound is inserted into the side surface 1a of each tooth 11 so as to form a stator 10. I am doing it. Numeral 13 is a protrusion projecting from the inner surface 1b of the stator core 1 into the slot 12 between the adjacent bobbins 3, and a guide hole 14 penetrating in the axial direction is provided in the center thereof.

When assembling a rotary electric machine with such a configuration, as shown in FIG.
Insert the rotor 5 fixed to the shaft 4 into the stator 1
The load-side and anti-load-side brackets 6 are attached to both axial ends of 0, and the shaft 4 is supported by bearings 61 provided on both brackets 6. Through holes 62 are provided in the bracket 6 at the same pitch as the guide holes 14, the through bolts 7 are passed through the through holes 62 of the bracket 6 and the guide holes 14, and the two brackets 6 and the stator 10 are threaded by screws at both ends of the through bolts 7. Tighten together and fix. In this case, since the guide hole 14 is provided inside the stator core 1, the through bolt 7 does not go out of the stator core 1, and the protrusion 1 provided with the guide hole 14 is provided.
Since 3 also does not project from the outer periphery of the stator core 1, the required space becomes small.

FIG. 3 is a front sectional view showing a second embodiment of the present invention, in which the inner surface 1b of the stator core 1 is formed by a plane extending perpendicularly to the side surface of each tooth 11 and the outer surface 1 is formed.
teeth c adjacent to each other by forming c as a plane parallel to the inner surface
Protrusions 13 and guide holes 14 are provided in the vicinity of the ridges of the two inner surfaces 1b extended from the roots, and the ridges of the adjacent outer surfaces 1c are connected by a gentle arc. With such a configuration,
The bobbin 3 can be attached in close contact with the side surface 1a and the inner surface 1b of the teeth 11 of the stator core 1, reducing the wasted space and reducing the armature coil 2 to the bobbin 3
The heat transfer coefficient to the stator core 1 is improved through the heat transfer, and the cooling effect is enhanced.

[0008]

As described above, according to the present invention, since the guide hole through which the through bolt is inserted is provided in the projection portion provided inside the stator core, an extra portion may project from the outer circumference of the stator core. No more space required. Further, since the inner surface of the stator core is formed so as to be perpendicular to the side surface of the tooth, the useless space in the slot between the teeth is reduced, and the close contact between the tooth and the bobbin is improved. The cooling efficiency of the armature coil is improved, and it is possible to provide a compact and highly efficient stator for a rotating electric machine.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an embodiment of the present invention.

FIG. 2 is a side sectional view taken along the line AA showing the embodiment of the present invention.

FIG. 3 is a front sectional view showing a second embodiment of the present invention.

FIG. 4 is a front sectional view showing a conventional example.

[Explanation of symbols]

1: stator core, 10: stator, 11: teeth,
12: slot, 13: protrusion, 14: guide hole, 2:
Armature coil, 3: bobbin, 4: shaft, 5: rotor, 6: bracket, 61: bearing, 62: through hole, 7:
Through bolt

Continued Front Page (72) Inventor Masao Mizuguchi, 31, Yoshikita, Iizuka City, Fukuoka Prefecture Wai E Drive Co., Ltd.

Claims (2)

[Claims] 1. A ring-shaped stator core formed by laminating thin steel plates and provided with a plurality of teeth radially inwardly arranged at equal intervals in a circumferential direction, and an electric machine wound around the teeth. In a stator of a rotating electric machine comprising a child coil, a bobbin having a rectangular cross section accommodating the armature coil, and a guide hole penetrating in the axial direction of the stator core, the guide hole is adjacent to the inner surface of the stator core. A stator of a rotating electric machine, characterized in that it is provided at a central portion of a protruding portion protruding into a slot formed between matching teeth. 2. The rotation according to claim 1, wherein an inner surface of the stator core is a flat surface extending perpendicularly to a side surface of each tooth, and an outer surface of the stator core is a flat surface parallel to the inner surface. Electric machine stator.