JPH06205557A - Stator of rotary electric apparatus - Google Patents

Abstract

PURPOSE:To reduce deformation of a plastic insulation cover to be engaged with a stator when it is molded and engaged with an iron core body. CONSTITUTION:An iron core body 11 alternately has teeth 12 and slots 13 which are coupled with a bridging portions 14. The iron core body 11 is provided with engaged yoke iron 23 and plastic insulation cover 15, while the insulation cover 15 comprises a teeth insulating portion 17 covering the end face of the teeth 12, a bridge portion insulating portion 18 covering the end face of the bridging portion 14 and a slot insulating portion 19 covering the internal surface of the slots 13. The bottom portion 20A of the slot insulating portion 19A to which a coil side 21a of the coil 21 in the internal circumference is inserted is placed in contact with the slots 13, while the bottom portion 20B of the slot insulating portion 19B to which a coil side 22a of the coil 22 in the external circumference is separated from the bottom portion 13a of the slots 13.

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 rotary electric machine equipped with a plastic insulating cover fitted to a core body.

[0002]

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

Insulating covers 5 and 5 are attached to the iron core body 1. As shown in FIG. 12, the insulating cover 5 includes a cylindrical tubular portion 5a, a plurality of plate-shaped tooth insulating portions 5b, and a bridging portion insulating portion 5c that connects the tooth insulating portions 5b to each other. , Slot insulation part 5 having a substantially V-shaped vertical wall shape
d and plastic are integrally formed, and when the insulating covers 5 and 5 are fitted to the iron core body 1 from the directions of arrows A and B in FIG. 11, the end surfaces of the tooth main portion 2a are It is covered with the tooth insulating portion 5b, the end surface of the bridge portion 4 is covered with the bridge insulating portion 5c, and the slot insulating portion 5d is in close contact with the inner surface of the slot 3 to cover the inner surface of the slot 3. .

An inner coil 6 and an outer coil 7 are mounted on the iron core body 1. Both of the inner and outer coils 6 and 7 are wound between the tooth main portion 2a and the tooth insulating portion 5b. The inner 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 on the closed end side inside, and the coil side 7a is inserted on the open end side inside the slot insulating portion 5d.

A yoke iron core 8 is mounted on the outer periphery of the iron core body 1 so as to be press-fitted into the press-fitting portion 2a of the tooth 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 is provided between the yoke core 8 and the inner and outer coils 6 and 7. It is insulated.

[0006]

However, in the above-mentioned conventional structure, the bottom portion 5e of the slot insulating portion 5d is in close contact with the bottom portion 3a of the slot 3, and as shown in FIG. 11, the bridging portion insulating portion 5c is formed. The width dimension α of was relatively small. Therefore, the insulating cover 5 has low strength in the bridging portion insulating portion 5c, and when the insulating cover 5 is molded, the molten resin is solidified or the solidified tooth insulating portion 5 is formed.
When projecting b by the ejector pin, the bridging part insulating part 5
There is a risk that stress concentrates on the portion c and the insulating cover 5 is deformed at the bridging portion insulating portion 5c as shown in FIG.

Even if the insulating cover 5 can be molded without deformation, if the molded insulating cover 5 is firmly gripped by fingers, the insulating cover 5 will be deformed at the bridging portion insulating portion 5c. When the insulating cover 5 is deformed in this way, it becomes difficult to perform the work of fitting the core body 1.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a rotating electric machine having an insulating cover which has a relatively large rigidity and has a small deformation amount at the time of molding and fitting to an iron core body. Is to provide the stator.

[0009]

A stator of a rotating electric machine according to the present invention comprises an iron core body having a slot open to the outer peripheral side between a plurality of teeth whose inner peripheral side is connected by a bridging portion, A plastic insulating cover fitted to the iron core body, having a tooth insulating portion covering the end surface of the tooth and 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 circumference side coil and an outer circumference side coil which are wound between the teeth from above the teeth insulation part and whose coil sides are inserted into the closed end side and the open end side in the slot insulation part, and the outer circumference of the iron core body. A bottom portion of a slot insulating portion into which a coil side of the outer peripheral side coil is inserted is formed apart from a bottom portion of a corresponding slot. Claim 1).

In this case, the tooth is composed of a tooth main portion extending to the outer peripheral side and a press-fitting portion projecting from the tip 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 tip between the tooth main parts of adjacent teeth is calculated from the circumferential distance at the tip between the tooth main parts of adjacent teeth forming the slot into which the coil side of the inner circumference side coil is inserted. It should be set to a large value (claim 2).

[0011]

According to the first aspect of the present invention, since the bottom of the slot insulating portion into which the coil side of the outer peripheral side coil is inserted is formed apart from the bottom of the corresponding slot, the insulating cover is formed from the bottom. The width of the bridging part insulating part reaching the inner surface of the is large. Therefore, the strength of the bridging portion insulating portion is improved, and as a result, the deformation amount at the time of molding the insulating cover and fitting it to the core body is reduced. In addition, since the closed end side is a dead space (space part) in the slot insulating part into which the coil side of the outer peripheral side coil is inserted, the width dimension from the bottom part of the slot insulating part to the inner peripheral surface of the insulating cover is 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 invention, there is an advantage that the dimension of the outer circumference side coil between the teeth main parts around which the outer circumference side coil is wound can be shortened and the length of the coil end of the outer circumference side coil can be shortened. However, there is a circumstance that the bottom shape of the slot has a relatively acute angle. Therefore, when an insulating cover that closely adheres to the bottom of the slot is formed, a sharp angle portion is formed on the insulating cover, which deteriorates the formability.However, the bottom of the slot insulating portion is formed apart from the bottom of the slot. In this case, the bottom portion of the slot insulating portion corresponding to the bottom portion of the slot having an acute angle can be formed in a comparatively rounded R shape, resulting in good moldability.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.
It will be described based on. First, in FIG. 5, the iron core body 1
1 has 16 radial teeth 12 and 16 slots 13 alternately, and each tooth 1
2 is composed of a tooth main portion 12a extending to the outer peripheral side and a press-fitting 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, 15 shown in FIGS. 3 and 4 are mounted on the iron core body 11. Insulation cover 15
Is a cylindrical portion 16 having a cylindrical shape and 16 arranged radially.
Each of the tooth insulating portions 17, the bridging portion insulating portion 18 that connects the 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 and 15 are shown in FIG.
When the iron core body 11 is fitted in the directions of arrows A and B, the insulating covers 15 and 15 come into contact with each other at the intermediate portion of the iron core body 11.
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 bridging portion 14 is covered with the bridging portion insulating portion 18, and the inner surface of the slot 13 is covered with the slot insulating portion 19. Be seen.

Moreover, 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 8 as shown in FIG.
From the value α of the bridging part insulating part 18A reaching the bottom part 20A of each slot insulating part 19A, the other slot insulating parts 19
The value β reaching the bottom portion 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
Is in close contact with the bottom portion 13a of the slot 13, and as shown in FIG.
Is separated from the bottom portion 13a.

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

That is, the coil side 21a of the inner circumference side coil 21
Are different slot insulating parts 1 that are positioned at a pitch of approximately 90 degrees.
9A, 19A inserted into the slot insulating portion 19A,
The coil side 22a of the outer peripheral side coil 22 located on the closed end side of the slot 19A is adjacent to the slot insulating portion 19a.
Slot insulation portions 19B, which differ when straddling A and 19A,
19B inserted into the slot insulation portion 19B, 19B
It is located on the open end side of.

A yoke iron core 23 is formed on the outer periphery of the iron core body 11 so as to be press-fitted into the press-fitting portion 12b of the tooth 12.
Is installed. Then, at the open end portions of the slot insulating portions 19, wedges 24 made of an insulating material (see FIG. 2) are provided.
Is attached, and the yoke iron core 23 and the inner and outer peripheral side coils 21, 22 are insulated by a wedge 24.

According to the above embodiment, the slot insulating portion 19
Since the bottom portion 20B of B is formed so as to be separated from the bottom portion 13a of the slot 13, the width dimension β of the bridging portion insulating portion 18B is the width dimension of the bridging portion insulating portion 18A, as shown by the chain double-dashed line in FIG. It becomes larger than α. Therefore, compared to the conventional case where the width dimension of the bridging part insulating part is unified to α (value from the inner peripheral surface of the insulating cover to the bottom part of the slot insulating part where the coil side of the inner peripheral side coil is inserted), The strength of the bridging portion insulating portion 18B is improved, and as a result, the amount of deformation at the time of molding the insulating cover 15 and fitting it to the core body 11 is reduced.

By the way, the coil side 2 of the outer circumference side coil 22
Since 2a is located on the open end side in the slot insulating part 19B, a dead space (space part) is generated on the closed end side in the slot insulating part 19B. In the above-described embodiment, with respect to the slot insulating portion 19B into which the coil side 22a of the outer peripheral side coil 22 is inserted, by increasing the distance from the inner peripheral surface of the insulating cover 15 to the bottom portion 20B of the slot insulating portion 19B, the bridging Since the width dimension β of the partial insulating portion 18B is large, the dead space can be effectively used without hindering the winding work of the outer peripheral coil 22.

The structure of the insulating cover 14 is not limited to that shown in the first embodiment, and for example, as shown in FIG. 6, the side wall of the slot insulating portion 19B is extended to the inner peripheral side. The extending portions 25, 25 may be provided, and the extending portions 25, 25 may be connected by the connecting portion 26 protruding from the bridging portion insulating portion 18B. In this case, the bridging portion insulating portion 18B. Since the ribs are provided on the bridge, 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 is apparent that the connecting portion 26 is the bottom portion of the slot insulating portion 19B. Since the bottom portion of 19B is originally intended to insulate the outer peripheral coil 22 from the slot 13, the substantial bottom portion of the slot insulating portion 19B is the bottom portion 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 alternately has teeth 29 connected by the bridging portion 28 and slots 30 open toward the outer peripheral side, and each tooth 29 extends to the outer peripheral side. The tooth main portion 29a and a press-fitting 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 every other one has a straight shape extending in the circumferential direction, and the remaining eight teeth 29B, 2
9C is bent and formed in a substantially V-shape and a substantially inverted C-shape so as to be line-symmetric with respect to the teeth 29A.

Therefore, the shape of the slot 30 is roughly classified into
The inner peripheral side swells in the circumferential direction (denoted by reference numeral 30A) and the outer peripheral side swells in the circumferential direction (reference numeral 30A).
(Shown by B), and the tooth main portions 29a, 29a of the teeth 29A, 29B forming the slot 30A.
The circumferential distance r1 between the tips of the slots is 3
The circumferential distance r2 at the tip portion between the tooth main portions 29a, 29a of the teeth 29B, 29A forming 0B.
It is set higher.

An insulating cover 31 shown in FIG. 8 is attached to the iron core body 27. Like 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 that covers the end surface of the tooth 29, a bridging portion insulating portion 34, and a slot insulating portion 35. Is integrally formed of plastic, and the width dimension β of the bridging portion insulating portion 34B is set to be larger than the width dimension α of the bridging portion insulating portion 34A.

Therefore, as shown in FIG. 7, the slot 30
The bottom portion 36A of the slot insulating portion 35A that covers the inner surface of A is in close contact with the bottom portion 30a of the slot 30A, and the bottom portion 36B of the slot insulating portion 35B that covers the inner surface of the slot 30B is separated from the bottom portion 30a of the slot 30B.

Teeth main portion 29 of the teeth 29, 29
An inner circumference side coil 37 and an outer circumference side coil 38 are wound from above the teeth insulating portion 33 between a and 29a,
The coil sides 37a, 37a of the inner coil 37 are inserted into the closed ends of the slot insulating portions 35A, 35A, and the coil sides 38a, 38a of the outer coil 38 are open ends of the slot insulating portions 35B, 35B. Is inserted on the side. A yoke iron core 39 is attached to the iron core main body 27 so as to be press-fitted into the press-fitting portion 29b of the tooth 29, and a wedge 40 made of an insulating material is attached to the open end side of each slot insulating portion 35. ing.

By the way, in the above-mentioned second embodiment, since the outer peripheral side portions of the teeth 29B and 29C around which the outer peripheral side coil 38 is wound are brought closer to the teeth 29C and 29B of the other side, the teeth 29B and 29C. The dimension between the coils is shortened, and the coil end 38 of the outer coil 38 is
The length of b, and eventually the peripheral length of the outer peripheral coil 38, is shortened, and the amount of wire used and copper loss are reduced. However, in the iron core body 27 provided with the teeth 29B and 29C of this type, the coil side 38 of the outer coil 38 is formed.
There is a circumstance that the bottom portion 30a of the slot 30B into which a is inserted has a relatively acute angle γ (see FIG. 7).

Therefore, when an insulating cover applied to the iron core body 27 is designed such that the bottom of the slot insulating portion is in close contact with the bottom portion 30a of the slot 30B having an acute angle, the bottom of the slot insulating portion is considered. The shape also needs to be an acute angle. However, since the resin is difficult to be filled in the acute-angled portion engraved in the forming die, the insulating cover having the bottom of the acute-angled 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 provided with the acute angle slot 30.
Since it is formed apart from the bottom portion 30a of B, the bottom portion 36B of the slot insulating portion 35B can be formed in a comparatively gentle R shape, and as a result, the moldability of the insulating cover 31 is improved.

[0032]

As is apparent from the above description, the stator of the rotary electric machine of the present invention has the following excellent effects.
According to the means of claim 1, in the slot insulating portion into which the coil side of the outer peripheral side coil is inserted, the width dimension of the bridging portion insulating portion from the inner peripheral surface of the insulating cover to the bottom portion of the slot insulating portion is large. As a result, the strength of the bridging portion insulating portion is improved without hindering the winding work of the outer peripheral side coil, and as a result, the deformation amount at the time of molding the insulating cover and fitting it to the core body is reduced. Reduce.

According to the second aspect of the present 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 bottom shape of the slot has a relatively acute angle. However, since the bottom portion of the slot insulating portion corresponding to the bottom portion of the acute-angled slot can be formed in a comparatively gentle R shape, as a result, the moldability of the insulating cover is improved.

[Brief description of drawings]

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

FIG. 2 is a sectional view taken along the line EE of FIG.

[Fig. 3] 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 modified example of the insulating cover.

FIG. 7 is a diagram corresponding to FIG. 1 showing a second embodiment of the present invention.

FIG. 8 is a view corresponding to FIG.

FIG. 9 is a view corresponding to FIG.

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

FIG. 11 is a view corresponding to FIG.

FIG. 12 is a view corresponding to FIG.

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

[Explanation of symbols]

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

Claims (2)

[Claims] 1. An iron core main body having a slot open to the outer peripheral side formed between a plurality of teeth whose inner peripheral side is connected by a bridging portion, and an iron core main body fitted to cover the end surface of the tooth. A plastic insulating cover having a tooth insulating portion and a bridging portion insulating portion that covers end faces of the bridging portion and a slot insulating portion that covers an inner surface of the slot; and a winding member wound on the tooth insulating portion and between the teeth. , An inner peripheral side coil and an outer peripheral side coil whose coil sides are inserted into a closed end side and an open end side inside the slot insulating portion, and a yoke iron core mounted on the outer periphery of the iron core body, A stator of a rotary electric machine, wherein a bottom portion of a slot insulating portion into which a coil side is inserted is formed apart from a bottom portion of a corresponding slot. 2. A tooth is 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, forming a slot into which the coil side of the outer peripheral coil is inserted. The circumferential distance between the tooth main parts of the matching teeth is larger than the circumferential distance between the tooth main parts of the adjacent teeth forming the slot into which the coil side of the inner circumferential coil is inserted. The stator of the rotating electric machine according to claim 1, wherein the stator is set to.