JP2000354347A - Stator for rotating electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator for a rotating electric machine having small outside dimensions. SOLUTION: An insulator, electrically insulating a stator core from a winding 3, is fitted on a stator core 1. First and second folded grooves 10, 11 are formed, which extend in parallel at a prescribed interval in the separating direction outward from the stator core 1, at a portion extending to the outside beyond the outer-periphery surface 1b of the stator core 1 of a guide part 6 of an insulator 4. The first folded groove 10 is open to the side, where the stator core 1 is positioned and both directions to which the first folded groove 10 extends. The second folded groove 11 is open to the opposite side to the side, where the stator core 1 is positioned and in both directions to which the second folded groove 101 extends. A middle portion and a retaining part 9 are folded along the first and second folded grooves 10 and 11, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator for a rotating electric machine used for a rotating electric machine such as a motor or a generator.

[0002]

2. Description of the Related Art FIG. 6 is a perspective view of a stator employed in a conventional small stepping motor, and FIG. 7 is a sectional view of a main part of FIG. In FIG. 6, reference numeral 101 denotes a stator core having a plurality of salient pole portions 102 on an inner peripheral portion of an annular yoke. An insulator 104 made of an insulating resin for electrically insulating the stator core from the exciting winding 103 is mounted on the stator core 101. The insulator 104 has a structure in which a two-piece insulator member is fitted to the stator core 101, and also has a structure formed by insert molding using the stator core as an insert. FIG. 6 shows the shape of the end 104A located on one side of the axis of the rotating shaft of the rotor (not shown). The insulator 104 includes the salient pole portion 102
And a bobbin portion 105 having a flange around each salient pole portion 102 for winding the exciting winding 103. Also, one end 104A of the insulator 104 has a stator core 1
The guide portion 106 extends radially outward along the end face 101a of the first guide line 01 and guides the lead wires 103a of the two-phase excitation winding 103 outward.
06 and a holding portion 109 for holding an external connection portion 108 having six terminal portions 107 to which the ends of the lead wires 103a of the two-phase excitation winding 103 are electrically connected, respectively. It has integrally. This external connection 1
08 has a so-called connector structure.

[0003]

SUMMARY OF THE INVENTION Insulator 104
In order to wind the exciting winding 103 around the space 110 of each bobbin section 105, the space 110 of the bobbin section 105 must not be closed. Conventionally, therefore, a structure is employed in which a holding portion 109 for holding a part of the guide portion 106 and the external connection portion 108 projects radially outward of the stator core 101. In such a conventional structure, the external connection portion 108 and the holding portion 109 are formed by the stator core 10
1, the outer dimensions or radial dimensions of the rotating electric machine are increased, which hinders miniaturization.

An object of the present invention is to provide a stator for a rotating electric machine that can be smaller in external dimensions than a stator for a rotating electric machine of the United States.

[0005]

SUMMARY OF THE INVENTION A stator for a rotating electrical machine to be improved by the present invention is a stator core having a plurality of salient pole portions on an inner periphery of an annular yoke, and a plurality of salient pole portions of the stator core. And an insulator mounted on the stator core to electrically insulate the stator core and the winding from each other. The insulator extends outward along an end face of the stator core (an end face located on one side in the axial direction of the rotation axis of the rotor) and guides the lead wires of two or more phases of winding outward. And a holding portion for holding an external connection portion having two or more terminal portions provided at the tip of the guide portion and having two or more terminal portions to which the ends of the lead wires of two or more phases are electrically connected, respectively. Have. And the external connection part is
In a state where the stator core is held by the holding portion, the protrusion protrudes from the holding portion toward the side where the stator core is located (the other side in the axial direction of the rotating shaft of the rotor).

In the stator for a rotating electrical machine according to the present invention, the guide portion of the insulator includes a portion extending outward beyond the outer peripheral surface of the stator core and a portion extending outwardly from the stator core (radially outward of the rotor). First and second folded grooves extending at intervals (preferably in parallel) are formed. The first folded groove is open to the side where the stator core is located (the other side in the axial direction) and to both directions in which the first folded groove extends. Further, the second folded groove is open to the opposite side (one side in the axial direction) of the side where the stator core is located and to both directions in which the second folded groove extends. With such a configuration, the intermediate portion located between the first return groove and the second return groove along the first return groove is folded back so as to open the first return groove. The holding portion can be positioned inside the outer peripheral portion of the stator core by folding the portion back to the opposite side (one side in the axial direction) from the side where the stator core is located. As a result, the external connection portion held by the holding portion is also located inside the outer peripheral portion of the stator core, and the outer dimensions of the stator can be made smaller than those of the conventional stator. It is needless to say that the shape and dimensions of the intermediate portion are determined so as not to hinder the rotation of the rotor in the folded state.

[0007] When the holding portion is folded so as to open the second folding groove along the second folding groove, the external connection portion held by the holding portion can be extended along the intermediate portion.
With this configuration, the external connection portion can be extended outward in the radial direction of the rotor, so that the axial dimension of the stator can be reduced.

In order to prevent the winding and the plurality of lead wires from being loosened when the intermediate portion of the guide portion located between the first folded groove and the second folded groove is bent, an intermediate portion is required. A lead wire locking portion for locking a plurality of lead wires is integrally provided on a surface of the portion located on the side opposite to the side on which the stator core is located (one side in the axial direction). When the intermediate portion is folded back to the side opposite to the side where the stator core is located around the first return groove, the plurality of lead lines do not loosen greatly, and In a state where the holding portion positioned before the second folded groove is folded around the second folded groove, the plurality of lead wires are not tensioned enough to cause a connection failure at the terminal portion. What is necessary is just to comprise so that several leader lines may be latched.

In order to fix the intermediate portion at a predetermined position when the intermediate portion is folded, the intermediate portion is folded back to the side opposite to the side where the stator core is located around the first folded groove. In this case, it is sufficient to provide fixing means for fixing the intermediate portion to the base located inside the first folded groove of the guide portion. In this case, the fixing means includes an engaging piece provided on one of the intermediate portion and the base and an engaging piece engaged portion provided on the other of the intermediate portion and the base and engaging with the engaging piece. Is preferred. A typical example of such a fixing means is a hook structure.

When the holding portion is turned around the second turning groove, it is preferable to provide fixing means for fixing the holding portion to the intermediate portion. Also in this case, the fixing means includes an engaging piece provided on one of the holding portion and the intermediate portion and an engaging piece engaged portion provided on the other of the holding portion and the intermediate portion and engaging with the engaging piece. It is preferred to configure.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of a stator for a rotating electrical machine according to the present invention will be described in detail below. FIG. 1 is a perspective view of a stator of a small two-phase stepping motor to which the present invention is applied, and FIG. 2 is a sectional view of a main part of FIG. 1 and 2, reference numeral 1 denotes a stator core formed by laminating a plurality of silicon steel plates and having a plurality of salient pole portions 2 on an inner peripheral portion of an annular yoke. The stator core 1 is provided with an insulator 4 made of insulating resin for electrically insulating the stator core 1 and the two-phase excitation windings 3 from each other. The insulator 4 is configured by fitting a split insulator member into the yoke of the stator core 1 from both sides in the axial direction of the rotating shaft of the rotor (not shown). Note that the insulator 4 may be formed by insert molding using the stator core 1 as an insert. FIG. 1 shows the shape of an end 4A located on one side of the axis of the rotating shaft of the rotor (not shown). The insulator 4 covers the inner peripheral portion of the yoke of the stator core 1 and other outer surfaces except for the magnetic pole surfaces of the plurality of salient pole portions 2. A bobbin part 5 having a flange around is provided.

One end 4A of the insulator 4 extends radially outward along an end face la of the stator core 1 (an end face located on one side in the axial direction of the rotation axis of the rotor) to excite two phases. A guide portion 6 for guiding the lead wire 3a of the winding 3 toward the outside and an end of the lead wire 3a of the two-phase exciting winding 3 provided at the tip of the guide portion 6 are electrically connected to each other. And a holding portion 9 for holding an external connection portion 8 having six terminal portions 7. In this example, since the two-phase excitation winding 3 is bifilar wound, three lead wires 3 a are provided for the one-phase excitation winding 3. This external connection 8
Has a so-called connector structure in which six terminal portions 7 are held in a main body made of insulating resin. The external connection portion 8 projects from the holding portion 9 toward the side where the stator core 1 is located (the other side in the axial direction of the rotor shaft) while being held by the holding portion 9 by the fitting structure. .

The guide portion 6 of the insulator 4 includes a portion extending outward beyond the outer peripheral surface 1b of the stator core 1,
First and second extending parallel to each other at a predetermined interval in a direction away from the stator core 1 outward (radially outward of the rotor).
The folded grooves 10 and 11 are formed. The first folded groove 10 is open to the side where the stator core 1 is located (the other side in the axial direction) and to both directions in which the first folded groove 10 extends. Also, the second folded groove 11
Are open to the opposite side (one side in the axial direction) of the side where the stator core is located and to both directions in which the second folded groove 11 extends. In this example, the cross-sectional shape (cross-sectional shape in a direction orthogonal to the direction in which the grooves extend) of the first and second folded grooves 10 and 11 has a V-shape.

When the intermediate portion 6a of the guide portion 6 located between the first folded groove 10 and the second folded groove 11 is folded, the exciting winding 3 and its lead 3a
In order to prevent the... From loosening, the side of the intermediate portion 6a opposite to the side where the stator core 1 is located (one side in the axial direction).
Are formed integrally with each other on the surface (front surface) located at the position (1). The base 6b of the guide 6 of the insulator 4 is provided integrally with two projections 13 for stopping the three lead wires 3a. Here, “lock” means that the lead wire 3a does not easily come off from the lead wire locking part 12 by contacting or engaging with the lead wire 3a. Leader wire locking portion 12 of this example ...
Has a cylindrical shape, and protrudes to a position beyond the tip positions of the terminal portion 7 and the protrusion 13. The lead wires 3a are wound at least once around the lead wire locking portions 12 and are locked to the lead wire locking portions 12, respectively. Alternatively, a slit may be formed in each of the lead wire locking portions 12 so that a part of each of the lead wires 3a is sandwiched between the slits.

With this configuration, as shown in FIG. 3, the first folded groove 1 is formed along the first folded groove 10.
0 and the intermediate portion 6 located between the second turning groove 11
a of the stator core 1 by folding back the intermediate portion 6 a to the side opposite to the side where the stator core 1 is located (one side in the axial direction) by opening the first return groove 10. It can be located inside the outer peripheral surface 1b. As a result, the external connection portion 8 held by the holding portion 9 also has the outer peripheral surface 1 b of the stator core 1.
Therefore, the outer dimensions of the stator can be made smaller than those of the conventional stator. It is needless to say that the shape and dimensions of the intermediate portion 6a are determined so as not to hinder the rotation of the rotor in the folded state. Although not shown, two protrusions 13 are formed on the surface of the intermediate portion 6a when the intermediate portion 6a is folded back.
Are formed in two concave portions. Therefore, even if there are two projections 13, the surface of the intermediate portion 6a can be opposed to the surface of the base 6b.

Further, as shown in FIG.
1 to open the second folded groove 11.
Is folded, the external connection portion 8 held by the holding portion 9 can be made to follow the back surface of the intermediate portion 6a. With this configuration, the external connection portion 8 can be extended outward in the radial direction of the rotor, so that the axial dimension of the stator can be reduced.

Further, in this example, since the lead wire locking portions 12 having a structure around which the lead wires 3a are wound are provided, the side opposite to the side where the stator core 1 is located around the first folded groove 10 is provided. Even when the intermediate portion 6a is folded back, the lead lines 3a do not loosen significantly. Further, even in a state where the holding portion 9 located before the second folded groove 11 is folded around the second folded groove 11, the lead wire 3a slightly moves. .. Can be prevented from being tensioned (pulled) as much as they occur.

In order to fix the intermediate portion 6a at a predetermined position when the intermediate portion 6a is folded, the intermediate portion 6a is located on the side opposite to the side where the stator core 1 is located with the first folded groove 10 as the center. In the state where is folded back, fixing means for fixing the intermediate portion 6a to the base 6b located inside the first folded groove 10 of the guide portion 6 may be provided. In this case, the fixing means includes an engaging piece provided on one of the intermediate portion 6a and the base 6b and an engaging piece engaged portion provided on the other of the intermediate portion 6a and the base 6b and engaging with the engaging piece. Can be composed of FIG. 5 is a cross-sectional view of the main part when the fixing means is formed by a hook structure. In this example, a hook 14 is provided as an engagement piece on the intermediate portion 6a, and a flange (engaging piece engaged portion) 15 that engages with the hook 14 is provided on the base 6b. When the holding portion 9 is folded around the second folding groove 11,
It is preferable to provide fixing means for fixing the holding portion 9 to the intermediate portion 6a. Also in this case, the fixing means includes an engaging piece provided on one of the holding portion and the intermediate portion and an engaging piece engaged portion provided on the other of the holding portion and the intermediate portion and engaging with the engaging piece. It is preferred to configure.

In the state shown in FIG. 4, when the end cap to which the bearing for supporting the rotating shaft of the rotor is fixed is attached to the stator core 1, the external connection portion 8 is partially connected to the intermediate portion 6a by a part of the end cap. You may make it press toward. Also, the base 6b) the intermediate portion 6 using an adhesive.
a and the external connection 8 may be fixed to each other.

In the above example, the external connection portion 8 is fixed to the holding portion 9 by a fitting structure. However, the holding portion and the external connection portion 8 may be formed integrally. .

[0021]

According to the present invention, by folding back the intermediate portion located between the first and second return grooves along the first return groove so as to open the first return groove. Since the holding portion can be located inside the outer peripheral portion of the stator core, the external connection portion held by the holding portion can be located inside the outer peripheral portion of the stator core. Has the advantage that it can be smaller than that of the stator. In addition, when the holding portion is turned back so as to open the second turning groove along the second turning groove, the external connection portion held by the holding portion can be made to extend along the intermediate portion. It can be extended radially outward, and the axial dimension of the stator can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a stator of a small two-phase stepping motor to which the present invention is applied.

FIG. 2 is a sectional view of a main part of FIG.

FIG. 3 is a perspective view showing a state in which an intermediate portion is folded back along a first folding groove from the state shown in FIG. 1;

FIG. 4 is a perspective view showing a state where the holding unit is folded back along a second folding groove from the state of FIG. 3;

FIG. 5 is an enlarged sectional view showing an example of a configuration of a fixing means.

FIG. 6 is a perspective view of a stator employed in a conventional small stepping motor.

FIG. 7 is a sectional view of a main part of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator core 2 Salient pole part 3 Excitation winding 4 Insulator 5 Bobbin part 6 Guide part 6a Intermediate part 7 Terminal part 8 External connection part 9 Holding part 10 1st return groove 11 2nd return groove

Continuation of the front page (72) Inventor Akihiro Amari 1-5-15-1 Kita-Otsuka, Toshima-ku, Tokyo F-term (reference) 5Y604 BB02 BB03 BB14 CC01 CC05 CC16 DB01 PB03 PE06 QA08 QB03 QB12 5H605 AA00 BB05 BB10 DD03 EC05 EC12 FF06 GG18

Claims (6)

[Claims] 1. A stator core having a plurality of salient pole portions on an inner peripheral portion of an annular yoke, two or more phases of winding wound around the plurality of salient pole portions of the stator core, the stator core and the windings And an insulator attached to the stator core to electrically insulate the wire from the wire.The insulator extends outward along the end face of the stator core to form a lead wire of the two-phase or more winding. An external part provided with a guide part for guiding outwardly and two or more terminal parts provided at the tip of the guide part and the ends of the lead wires of the two or more phase windings are respectively electrically connected to each other; A stator for a rotating electrical machine having integrally with a holding portion for holding a connection portion, and protruding from the holding portion to a side where the stator core is located in a state where the external connection portion is held by the holding portion. And a first and second turn-back groove formed in the guide portion of the insulator at a portion extending outward beyond the outer peripheral surface of the stator core at a predetermined interval in a direction away from the stator core to the outside. The first folded groove is open toward the side where the stator core is located and both directions in which the first folded groove extends, and the second folded groove is formed by the stator core. A stator for a rotating electrical machine, wherein the stator is open toward a side opposite to a side on which it is located and both directions in which the second folded groove extends. 2. An intermediate portion of the guide portion located between the first turn-back groove and the second turn-back groove, on a surface opposite to the side where the stator core is located,
A lead wire locking portion for locking the plurality of lead wires is provided integrally, and the lead wire locking portion is opposite to a side where the stator core is located around the first folded groove. In a state where the intermediate portion is folded back, the plurality of lead lines do not greatly loosen, and the second
In a state in which the holding portion positioned earlier than the return groove is folded around the second return groove, the plurality of lead-out lines are not tensioned enough to cause a connection failure at the terminal portion. And a stator for a rotating electrical machine, wherein the stator is configured to lock the plurality of lead wires. 3. A state in which the intermediate portion is folded back to a side opposite to a side where the stator core is located with respect to the first folded groove as a center. A stator for a rotating electrical machine, further comprising fixing means for fixing to a base located inside. 4. The fixing means includes an engagement piece provided on one of the intermediate portion and the base, and an engagement piece cover provided on the other of the intermediate portion and the base and engaged with the engagement piece. The stator for a rotating electrical machine according to claim 3, comprising an engaging portion. 5. A fixing means for fixing the distal end portion to the intermediate portion when the holding portion is folded around the second folded groove. The stator for a rotating electrical machine according to claim 2. 6. The fixing means includes an engagement piece provided on one of the holding portion and the intermediate portion, and an engagement piece provided on the other of the holding portion and the intermediate portion to engage with the engagement piece. The stator for a rotating electrical machine according to claim 5, comprising a single engaged portion.