JP2908655B2 - Rotating electric machine stator - Google Patents

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 having a plastic insulating cover fitted to an iron core body.

[0002]

2. Description of the Related Art A conventional structure of a stator for a rotary electric machine of this type will be described with reference to FIGS. First, in FIG. 10, the iron core body 1 includes a tooth main portion 2 extending to the outer peripheral side.
a and a plurality of teeth 2 comprising press-fitting portions 2b protruding from the tips of the tooth main portions 2a and slots 3 alternately, and a bridging portion is formed between the inner peripheral sides of each tooth main portion 2a. 4, and the slot 3 is open toward the outer peripheral side.

[0003] The core body 1 is provided with insulating covers 5 and 5. As shown in FIG. 12, the insulating cover 5 includes a cylindrical tubular portion 5a, a plurality of plate-shaped teeth insulating portions 5b, and a bridging portion insulating portion 5c that connects between the teeth insulating portions 5b. , A substantially V-shaped vertical wall-shaped slot insulating portion 5
When the insulating covers 5 and 5 are fitted to the core body 1 in the directions of arrows A and B in FIG. 11, the end faces of the teeth main portion 2a are formed as shown in FIG. The end surface of the bridging portion 4 is covered with the bridging portion insulating portion 5c, and the slot insulating portion 5d is in close contact with the inner surface of the slot 3 so as to cover the inner surface of the slot 3. .

[0004] An inner peripheral side coil 6 and an outer peripheral side coil 7 are mounted on the core body 1. Both the inner and outer coils 6 and 7 are wound around the tooth main portion 2a from above the tooth insulating portion 5b, and the inner peripheral coil 6 has a coil side 6a having a slot insulating portion 5d. The coil side 7a of the outer peripheral side coil 7 is inserted into the open end side in the slot insulating portion 5d.

A yoke core 8 is mounted on the outer periphery of the core body 1 so as to be pressed into the press-fitting portion 2a of the teeth 2. A wedge 9 (see FIG. 11) made of an insulating material is attached to the open end portion of the slot insulating portion 5d, and the wedge 9 connects the yoke core 8 with the inner and outer coils 6 and 7. Insulated.

[0006]

However, in the above-described conventional structure, the bottom 5e of the slot insulating portion 5d is all in close contact with the bottom 3a of the slot 3, and as shown in FIG. Was relatively small. For this reason, the insulating cover 5 has a low strength at the bridging portion insulating portion 5c, and when the insulating cover 5 is formed, when the molten resin is solidified or when the solidified tooth insulating portion 5c is formed.
b is projected by the ejector pin, the bridge insulating portion 5
Stress concentrates on the portion c, and as shown in FIG. 13, the insulating cover 5 may be deformed by the bridge insulating portion 5c.

[0007] Even if the insulating cover 5 can be formed without deformation, if the formed insulating cover 5 is strongly grasped with fingers, the insulating cover 5 may be deformed at the bridge insulating portion 5c. When the insulating cover 5 is deformed in this way, it becomes difficult to perform the work of fitting to the core body 1.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a rotating electric machine having an insulating cover having relatively high rigidity and a small amount of deformation during molding and fitting to an iron core body. Is to provide a stator.

[0009]

According to the present invention, there is provided a stator for a rotating electric machine, comprising: a core body having a slot which is opened to the outer periphery between a plurality of teeth having an inner periphery connected by a bridging portion; A plastic insulating cover fitted to the iron core body, having a teeth insulating portion covering the end surface of the teeth, a bridging portion insulating portion covering the end surface of the bridging portion, and a slot insulating portion covering the inner surface of the slot; An inner coil and an outer coil which are wound between the teeth from above the teeth insulating portion and whose coil sides are inserted on the closed end side and the open end side in the slot insulating portion, and on the outer periphery of the iron core body. A yoke core to be fitted, wherein the bottom of the slot insulating portion into which the coil side of the outer peripheral side coil is inserted is formed to be separated from the bottom of the corresponding slot. Claim 1).

In this case, the teeth are composed of a tooth main portion extending to the outer peripheral side and a press-fitting portion projecting from a tip end portion of the tooth main portion to form a slot into which the coil side of the outer peripheral coil is inserted. The circumferential distance at the distal end between the tooth main portions of the adjacent teeth is greater than the circumferential distance at the distal end between the tooth main portions of the adjacent teeth forming the slot into which the coil side of the inner circumferential coil is inserted. It is better to set it to a large value (claim 2).

[0011]

According to the first aspect of the present invention, the bottom of the slot insulating portion into which the coil side of the outer peripheral side coil is inserted is formed to be separated from the bottom of the corresponding slot. The width dimension of the bridging portion insulating portion reaching the inner surface becomes larger. Accordingly, the strength of the bridging portion insulating portion is improved, and as a result, the amount of deformation at the time of molding the insulating cover and at the time of fitting the insulating cover to the iron core body is reduced. Further, since the closed end side is a dead space (space portion) in the slot insulating portion into which the coil side of the outer peripheral coil is inserted, the width dimension from the bottom of the slot insulating portion to the inner peripheral surface of the insulating cover is limited. Even if it becomes large, it does not hinder the winding work of the outer peripheral side coil.

According to the second aspect of the present invention, there is an advantage that the dimension of passing over between the teeth main portions around which the outer peripheral side coil is wound is reduced and the length of the coil end of the outer peripheral side coil can be reduced. In some cases, the shape of the bottom of the slot is relatively acute. Therefore, when the insulating cover is in close contact with the bottom of the slot, an acute angle portion is formed in the insulating cover and moldability is deteriorated, but the bottom of the slot insulating portion is formed separately from the bottom of the slot. In this case, the bottom of the slot insulating portion corresponding to the bottom of the acute-angled slot can be formed in a relatively gentle R shape, and as a result, the formability is improved.

[0013]

1 to 5 show a first embodiment of the present invention.
It will be described based on. First, in FIG.
1 has 16 radially arranged teeth 12 and 16 slots 13 alternately.
2 is composed of a tooth main portion 12a extending to the outer peripheral side and a press-fit portion 12b protruding from the tip of the tooth main portion 12a, and the inner peripheral side of each tooth 12 is connected by a bridging portion 14, The slot 13 is open toward the outer peripheral side.

Insulating covers 15 and 15 shown in FIGS. 3 and 4 are mounted on the core body 11. Insulation cover 15
Is a cylindrical portion 16 and a radially arranged 16
The teeth insulating portions 17, the bridging portion insulating portions 18 connecting the respective tooth insulating portions 17 to each other, and the 16 slot insulating portions 19 having a substantially V-shaped vertical wall shape are integrally formed of plastic. Yes, the insulating covers 15, 15 are
Is fitted to the iron core body 11 in the directions of arrows A and B of FIG.
As shown in FIG. 1, the end surface of the tooth main portion 12 a is covered with the tooth insulating portion 17, the end surface of the bridge portion 14 is covered with the bridge insulating portion 18, and the inner surface of the slot 13 is covered with the slot insulating portion 19. Will be

Further, as shown in FIG. 3, the width dimension of the bridging portion insulating portion 18 extending from the inner peripheral surface of the insulating cover 15 to the bottom portion 20 of the slot insulating portion 19 is located near the one-dot chain line.
From the value α of the bridge insulating portion 18A reaching the bottom 20A of the slot insulating portions 19A, the other slot insulating portions 19A
The value β reaching the bottom 20B of B is set to be larger,
In a state where the insulating cover 15 is fitted to the iron core body 11,
As shown in FIG. 1, the bottom portion 20A of the slot insulating portion 19A
Are in close contact with the bottom 13a of the slot 13, and as shown in FIG.
Away from the bottom 13a.

As shown in FIG. 1, an inner circumferential coil 21 and an outer circumferential coil 22 are mounted on the iron core body 11, and the inner circumferential coil 21 and the outer circumferential coil 22 have a phase difference of 90 degrees from each other. Different voltages are applied. Of these,
The coils 21 and 22 on the outer peripheral side are connected to the coil sides 21a and 22.
a is inserted into the slot insulating portion 19 and wound around the tooth insulating portion 17 between the plurality of tooth main portions 12a.

That is, the coil side 21a of the inner peripheral coil 21
Are different slot insulating portions 1 located at a pitch of approximately 90 degrees.
9A, 19A, and is inserted into the slot insulating portions 19A, 19A.
The coil side 22a of the outer peripheral side coil 22 is located on the closed end side of the
A, different slot insulating portions 19B in a state of straddling
19B, and inserted into the slot insulating portions 19B, 19B.
Is located on the open end side of.

The yoke core 23 is pressed onto the outer periphery of the core body 11 so as to be pressed into the press-fitting portion 12b of the tooth 12.
Is installed. The open ends of the slot insulating portions 19 are respectively provided with wedges 24 made of insulating material (see FIG. 2).
The yoke core 23 and the inner and outer coils 21 and 22 are insulated from each other by a wedge 24.

According to the above embodiment, the slot insulating portion 19
Since the bottom 20B of B is formed apart from the bottom 13a of the slot 13, the width β of the bridge insulation 18B is equal to the width of the bridge insulation 18A, as shown by a two-dot chain line in FIG. larger than α. For this reason, the width dimension of the bridging part insulating part is unified to α (value from the inner circumferential surface of the insulating cover to the bottom of the slot insulating part where the coil side of the inner circumferential side coil is inserted), The strength of the bridging portion insulating portion 18 </ b> B is improved, and as a result, the amount of deformation when the insulating cover 15 is formed and when the insulating cover 15 is fitted to the iron core body 11 is reduced.

Incidentally, the coil side 2 of the outer peripheral side coil 22
Since 2a is located on the open end side in the slot insulating portion 19B, a dead space (space portion) is generated on the closed end side in the slot insulating portion 19B. In the above embodiment, the bridge between the inner peripheral surface of the insulating cover 15 and the bottom portion 20B of the slot insulating portion 19B is increased in the slot insulating portion 19B into which the coil side 22a of the outer peripheral coil 22 is inserted. Since the width dimension β of the insulating section 18B is large, the work of winding the outer peripheral coil 22 is not hindered, and the dead space can be effectively used.

The structure of the insulating cover 14 is not limited to the structure shown in the first embodiment, but may be, for example, as shown in FIG. The extending portions 25, 25 may be provided, and the extending portions 25, 25 may be connected to each other by a connecting portion 26 protruding from the bridging portion insulating portion 18B. In this case, the bridging portion insulating portion 18B And the strength of the bridging portion insulating portion 18B is further improved.

In this case, since the connecting portion 26 of the slot insulating portion 19B is in close contact with the bottom portion 13a of the slot 13, it seems that the connecting portion 26 is apparently the bottom of the slot insulating portion 19B. Since the bottom of the slot 19B is originally intended to insulate the outer circumferential coil 22 from the slot 13, the substantial bottom of the slot insulating portion 19B is the bottom 20B.

Next, a second embodiment of the present invention will be described with reference to FIGS. First, in FIG. 9, the iron core main body 27 has teeth 29 connected by a bridging portion 28 and slots 30 opened toward the outer periphery alternately, and each tooth 29 extends to the outer periphery. It is composed of a tooth main portion 29a and a press-fit portion 29b protruding from the tip of the tooth main portion 29a.

In this case, of the 16 teeth 29,
The eight teeth 29A arranged alternately form a straight shape extending in the circumferential direction, and the remaining eight teeth 29B, 2
9C is bent and formed in a substantially rectangular shape and a substantially inverted rectangular shape so as to be a line object with respect to the teeth 29A.

Therefore, the shape of the slot 30 is roughly divided into
One having an inner peripheral side swelling in the circumferential direction (indicated by reference numeral 30A) and one having an outer peripheral side swelling in the peripheral direction (reference numeral 30A).
B), and the teeth main portions 29a, 29a of the teeth 29A, 29B forming the slot 30A.
The circumferential distance r1 at the leading end between them is the slot 3
0B, the circumferential distance r2 at the distal end between the teeth main portions 29a, 29a of the teeth 29B, 29A.
It is set larger.

An insulation cover 31 shown in FIG. As with the insulating cover 15 shown in FIG. 4, the insulating cover 31 includes a tubular portion 32 (see FIG. 7), a tooth insulating portion 33 covering the end surface of the teeth 29, a bridge insulating portion 34, and a slot insulating portion 35. Is formed integrally with plastic, and the width dimension β of the bridge insulating part 34B is set to be larger than the width α of the bridge insulating part 34A.

Therefore, as shown in FIG.
The bottom 36A of the slot insulating portion 35A covering the inner surface of A is in close contact with the bottom 30a of the slot 30A, and the bottom 36B of the slot insulating portion 35B covering the inner surface of the slot 30B is separated from the bottom 30a of the slot 30B.

Teeth main part 29 of teeth 29, 29
a, an inner peripheral coil 37 and an outer peripheral coil 38 are wound from above the teeth insulating portion 33,
The coil sides 37a, 37a of the inner peripheral coil 37 are inserted into the closed ends in the slot insulating portions 35A, 35A, and the coil sides 38a, 38a of the outer peripheral coil 38 are opened ends in the slot insulating portions 35B, 35B. Side is inserted. Further, a yoke core 39 is mounted on the core body 27 so as to be pressed into the press-fitting portion 29b of the teeth 29, and a wedge 40 made of an insulating material is mounted on the open end side of each slot insulating portion 35. ing.

In the second embodiment, the outer peripheral portions of the teeth 29B and 29C around which the outer peripheral coil 38 is wound are moved toward the other teeth 29C and 29B, respectively. The distance between the coil ends 38 of the outer peripheral side coil 38 is reduced.
The length of b, and consequently, the circumference of the outer peripheral coil 38 are shortened, and the amount of wire used and copper loss are reduced. However, in the core body 27 provided with the teeth 29B and 29C of this kind, the coil side 38 of the outer peripheral coil 38
There is a situation that the bottom 30a of the slot 30B into which the “a” is inserted has a relatively acute angle γ (see FIG. 7).

Therefore, assuming that the bottom of the slot insulating portion is closely attached to the bottom 30a of the acute angle slot 30B as the insulating cover applied to the iron core body 27, the bottom of the slot insulating portion is considered. The shape also needs to be acute. However, since the resin is difficult to fill in the acute angle portion engraved in the mold, the insulating cover having the bottom portion of the acute angle slot insulating portion has extremely poor moldability.

In this regard, according to the second embodiment, the bottom portion 36B of the slot insulating portion 35B is connected to the acute slot 30.
Since the bottom portion 30B of the slot B is formed apart from the bottom portion 30a, the bottom portion 36B of the slot insulating portion 35B can be formed in a comparatively gentle R shape. As a result, the moldability of the insulating cover 31 is improved.

[0032]

As is apparent from the above description, the stator of the rotating electric machine according to the present invention has the following excellent effects.
According to the first aspect, in the slot insulating portion into which the coil side of the outer peripheral side coil is inserted, the width dimension of the bridge insulating portion from the inner peripheral surface of the insulating cover to the bottom of the slot insulating portion is large. Therefore, the strength of the bridge insulating portion is improved without hindering the winding operation of the outer peripheral coil, and as a result, the deformation amount at the time of molding the insulating cover and at the time of fitting to the iron core body is reduced. Reduce.

According to the second aspect of the invention, there is an advantage that the length of the coil end of the outer peripheral coil wound between the teeth can be shortened, but the shape of the bottom of the slot becomes relatively acute. However, since the bottom of the slot insulating portion corresponding to the bottom of the sharp slot can be formed in a relatively gentle R shape, the moldability of the insulating cover is improved.

[Brief description of the drawings]

FIG. 1 is a partially broken top view showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II in FIG.

FIG. 3 is a bottom view of the insulating cover.

FIG. 4 is a perspective view of an insulating cover.

FIG. 5 is a top view of the core body.

FIG. 6 is an enlarged bottom view showing a modification of the insulating cover.

FIG. 7 is a view corresponding to FIG. 1, showing a second embodiment of the present invention;

FIG. 8 is a diagram corresponding to FIG. 3;

FIG. 9 is a diagram corresponding to FIG. 5;

FIG. 10 is a diagram corresponding to FIG. 1 showing a conventional example.

FIG. 11 is a diagram corresponding to FIG. 2;

FIG. 12 is a diagram corresponding to FIG. 4;

FIG. 13 is a side view showing a state where the insulating cover is deformed.

[Explanation of symbols]

11 is an iron core body, 12 is a tooth, 13 is a slot, 1
3a is the bottom of the slot, 14 is the bridge, 15 is the insulating cover, 17 is the teeth insulator, 18 is the bridge insulator, 19
Is a slot insulating portion, 20 is a bottom portion of the slot insulating portion, 21
Is an inner circumferential coil, 22 is an outer circumferential coil, 23 is a yoke iron core, 27 is an iron core main body, 28 is a bridging portion, 29 is a tooth,
30 is a slot, 30a is the bottom of the slot, 31 is an insulating cover, 33 is a tooth insulating part, 34 is a bridge insulating part,
35 is a slot insulating portion, 36 is a bottom portion of the slot insulating portion,
Reference numeral 37 denotes an inner peripheral coil, 38 denotes an outer peripheral coil, and 39 denotes a yoke core.

Claims (2)

(57) [Claims] 1. An iron core body having an inner peripheral side formed with a slot that is open to the outer peripheral side between a plurality of teeth connected by a bridging portion, and fitted to the iron core main body to cover an end face of the tooth. A plastic insulating cover having a teeth insulating portion and a bridging portion insulating portion covering an end surface of the bridging portion and a slot insulating portion covering an inner surface of the slot; and being wound between the teeth from above the tooth insulating portion. An inner circumferential coil and an outer circumferential coil whose coil sides are inserted into the closed end side and the open end side in the slot insulating portion; and a yoke core mounted on the outer circumference of the core body. A stator for a rotating electric machine, wherein a bottom of a slot insulating portion into which a coil side is inserted is formed to be separated from a bottom of a corresponding slot. 2. The adjacent tooth which comprises a tooth main portion extending to the outer peripheral side and a press-fit portion protrudingly provided at a tip end of the tooth main portion, and forming a slot into which the coil side of the outer peripheral coil is inserted. The circumferential distance at the distal end between the tooth main portions of the matching teeth is greater than the circumferential distance at the distal end between the tooth main portions of the adjacent teeth forming the slot into which the coil side of the inner circumferential coil is inserted. The stator for a rotating electric machine according to claim 1, wherein the stator is set to: