WO2017221951A1

WO2017221951A1 - Insulator, electric motor, and blower device

Info

Publication number: WO2017221951A1
Application number: PCT/JP2017/022776
Authority: WO
Inventors: 康仁塩谷; 宗忠佐藤; 賢人日根
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2016-06-23
Filing date: 2017-06-21
Publication date: 2017-12-28
Also published as: CN109314426A; JP2017229169A; JP6719052B2

Abstract

An insulator that covers a core having multiple T-shaped parts equipped with a yoke part provided on the outer-circumferential side, a tooth base part extending toward the inner-circumferential side from the yoke part, and a flange part extending toward both sides in the circumferential direction from the tip end on the inner-circumferential side of the tooth base part, said insulator being equipped with: inside ribs (2a, 2) that protrude toward the outer-circumferential side from both ends of the flange part in the circumferential direction; and outside ribs (3a, 3) that protrude toward the inner-circumferential side from both ends of the yoke part in the circumferential direction.

Description

Insulator, electric motor, and blower

The present invention relates to an insulator, an electric motor, and a blower.

Conventionally, in order to insulate a stator core, that is, an iron core and a winding wound around the iron core, a configuration in which an insulator which is an insulator is attached to the iron core is known. For example, in Patent Document 1, an insulator is mounted on an iron core, and a rib is formed on the insulator in order to ensure an insulation distance between the inner diameter of the iron core and the winding.

Hereinafter, the configuration will be described with reference to FIG.

FIG. 7 is a cross-sectional view showing a conventional iron core. As shown in FIG. 7, the insulator 110 includes an inner peripheral side rib 111 protruding from the inner diameter side. As a result, an insulation distance 115 between the end portion 116 of the flange portion 112, which is a part of the iron core, and the wound winding wire 113 is secured, and further, the coil 113 falls to the inner peripheral side wall 114 during winding. Is preventing.

JP 11-332139 A

In such a conventional insulator, since the insulator is integrally molded with the iron core and the outer periphery of the iron core is continuously covered with resin, the insulation distance between the inner periphery of the iron core and only the winding should be considered. It was good. However, when the size of the iron core is increased, it may be difficult to resin-mold the insulator integrally with the iron core, considering the workability and strength of fitting. In addition, when a split iron core is employed, the resin covering the outer periphery of the iron core is discontinuous and voids are generated between the iron cores, so that the insulation distance constraint may not be satisfied on the outer periphery. Therefore, the insulation distance is generally secured by adding members, but the increase in cost due to the increase in the number of parts management and the number of parts has been a problem.

In order to achieve this object, an insulator according to the present invention includes a yoke portion provided on the outer peripheral side, a tooth base portion extending from the yoke portion toward the inner peripheral side, and an inner portion of the tooth base portion. An inner rib that covers an iron core having a plurality of T-shaped portions provided with flanges extending from the circumferential tip to both sides in the circumferential direction, and bulges from the circumferential ends of the flange toward the outer circumferential side. And outer ribs that bulge from the circumferential ends of the yoke portion toward the inner circumferential side.

According to the present invention, it is possible to provide a high-quality insulator, electric motor, and blower at low cost because the insulation distance can be secured by a single material and the resin moldability can be improved.

FIG. 1 is a plan view of an electric motor according to an embodiment. FIG. 2 is a plan view of the stator according to the embodiment. FIG. 3A is an exploded perspective view of the insulator and the T-shaped portion according to the embodiment. FIG. 3B is a perspective view of the insulator and the T-shaped portion according to the embodiment. FIG. 4A is a plan view of the insulator member according to the embodiment. FIG. 4B is a cross-sectional view of the insulator member according to the embodiment. FIG. 5A is a plan view of an insulator member according to the embodiment. FIG. 5B is a cross-sectional view of the insulator member according to the embodiment. FIG. 6 is a partial radial cross-sectional view of the stator according to the embodiment. FIG. 7 is a cross-sectional view showing a conventional iron core.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following embodiments are examples embodying the present invention, and do not limit the technical scope of the present invention. In addition, throughout the drawings, the same portions are denoted by the same reference numerals, and the second and subsequent descriptions are omitted. Furthermore, in each drawing, the description of the details of each part not directly related to the present invention is omitted.

(Embodiment)
Embodiments of the present invention will be described with reference to the drawings.

First, the electric motor 15 according to the present embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a plan view of the electric motor 15 according to the embodiment.

The electric motor 15 includes a rotor (not shown) that rotates around the rotation shaft 17 and a stator 14 provided on the outer peripheral side of the rotor. FIG. 1 shows a schematic structure of the electric motor 15, and an outer shell and a rotor of the electric motor 15 are omitted for convenience.

The stator 14 includes a stator core, that is, an iron core 16, an insulator 1, and a winding 13.

The iron core 16 has a cylindrical shape, and has a hollow circular shape, that is, a donut shape in a cross-sectional view when a cross section perpendicular to the rotation shaft 17 which is a central axis in the cylindrical shape is defined. In the present embodiment, the iron core 16 is a split iron core, and is configured by connecting a plurality of T-shaped portions 18 (see FIG. 2) in the circumferential direction, which will be described in detail later.

The insulator 1 has a configuration in which a cylindrical iron core 16 is covered from above and below in the axial direction of the rotating shaft 17. That is, the insulator 1 includes an insulator member 1a (first insulator member) (see FIG. 3A) and an insulator member 1b (second insulator member) (see FIG. 3A). The insulator 1 includes an inner rib 2 and an outer rib 3 in order to secure an insulation distance between the iron core 16 and the winding 13, which will be described in detail later.

The winding 13 is a conductive wire whose main material is an alloy of copper or aluminum, and is wound around each T-shaped portion 18 (see FIG. 2) via the insulator 1. That is, the winding 13 is wound around the insulator 1. The winding 13 is connected to a DC power source via an AC power source or an inverter circuit (not shown) and energized to rotate the rotor about the rotating shaft 17.

Subsequently, the detailed structure of the stator 14 will be described with reference to FIG. FIG. 2 is a plan view of the stator 14 according to the present embodiment. In FIG. 2, the winding 13 constituting the stator 14 is omitted for convenience.

2, the iron core 16 is configured by connecting a plurality of T-shaped portions 18 in the circumferential direction around the rotation shaft 17 (eight in FIG. 2). The T-shaped portion 18 is covered with the insulator 1. In other words, the iron core 16 is covered with an insulator having substantially the same shape as the iron core 16 over the entire circumference. According to this configuration, the insulator 1 functions as an insulating material between the iron core 16 and the winding 13 (not shown).

However, the iron core 16 does not necessarily have to connect a plurality of T-shaped portions 18 that can be individually disassembled, and may be configured as an integral unit. The same applies to the insulator 1.

The T-shaped part 18 includes a yoke part 12, a tooth base part 10, and a flange part 11.

The yoke portion 12 is provided on the outer peripheral side of the T-shaped portion 18 and constitutes the outer peripheral surface of the iron core 16.

The tooth base portion 10 extends from the yoke portion 12 toward the inner peripheral side, and is provided as a rectangular portion in a cross-sectional view perpendicular to the rotation shaft 17.

The collar part 11 is provided as a part extended from the inner peripheral side tip part of the tooth base part 10 to both sides in the circumferential direction. The flange portion 11 is configured so that the thickness in the radial direction gradually decreases as the distance from the distal end portion of the inner periphery of the tooth base portion 10 increases. The flange portion 11 is not in contact with the adjacent flange portion 11 but constitutes the inner peripheral surface of the iron core 16.

In other words, the iron core 16 is configured by connecting a plurality of yoke portions 12 constituting an outer peripheral surface and a plurality of flange portions 11 constituting an inner peripheral surface to a plurality of tooth base portions 10. In addition, the iron core 16 is configured by connecting a cylinder made of a plurality of yoke portions 12 that is an outer peripheral surface and a cylinder made of a plurality of flanges 11 that are inner peripheral surfaces by a plurality of tooth base portions 10. I can say that. The circumferential width of one tooth base portion 10 is shorter than the circumferential length of one yoke portion 12 and shorter than the circumferential length of one collar portion 11.

Subsequently, the insulator member 1a and the insulator member 1b constituting the insulator 1 will be described in detail.

FIG. 3A is an exploded perspective view of the insulator 1 and the T-shaped portion 18 according to the embodiment. FIG. 3B is a perspective view of the insulator 1 and the T-shaped portion 18 according to the embodiment.

As shown in FIGS. 3A and 3B, the insulator 1 is composed of an insulator member 1a and an insulator member 1b. The insulator member 1a is fitted into the T-shaped portion 18 from the front surface 19 side (+ Z axis direction in FIG. 3A). The second insulator member 1b is fitted into the T-shaped portion 18 from the back surface 20 side (the −Z axis direction in FIG. 3A).

FIG. 4A is a plan view of an insulator member 1a according to the embodiment. FIG. 4B is a cross-sectional view of the insulator member 1a according to the embodiment. 4B is a cross-sectional view taken along line 4B-4B of FIG. 4A.

As shown in FIGS. 3A, 3B, 4A, and 4B, the insulator member 1a includes an outer peripheral wall 21a, an inner peripheral wall 22a, a connecting portion 23a, and an overlap portion 9a.

The outer peripheral wall 21a has a rectangular plate shape, and comes into contact with the inner peripheral surface 12a of the yoke portion 12 at the outer peripheral surface 211a. Further, the outer peripheral wall 21a is provided with a notch 26a from the one side 24a toward the other side 25a facing the one side 24a. The notch 26a has a U-shape as a whole at the edge 261a and the bottom 40a. Two side edges 27a adjacent to one side 24a and the other side 25a of the outer peripheral wall 21a are provided with outer ribs 3a over the entire side edge 27a (from the upper end to the lower end in FIG. 3A).

The inner peripheral wall 22a has a rectangular plate shape, and comes into contact with the outer peripheral surface 12b of the flange 11 at the inner peripheral surface 221a. Further, the inner peripheral wall 22a is provided with a notch 30a from the one side 28a toward the other side 29a facing the one side 28a. The cutout 30a has a U-shape as a whole at the edge portion 301a and the bottom portion 40a. Two side edges 31a adjacent to one side 28a and the other side 29a of the inner peripheral wall 22a are provided with inner ribs 2a over the entire side 31a.

The connecting portion 23a connects the edge portion 261a of the notch 26a in the outer peripheral wall 21a and the edge portion 301a of the notch 30a in the inner peripheral wall 22a with the notch direction aligned and with a certain distance. Here, the constant distance is a distance between the inner peripheral surface 12a of the yoke portion 12 and the outer peripheral surface 12b of the flange portion 11, and coincides with the radial length of the tooth base portion 10. That is, the connecting portion 23a has a tunnel shape having a certain distance in the radial direction. The T-shaped portion 18 can be fitted into the insulator member 1 a by bringing the inner periphery of the connecting portion 23 a in the tunnel shape into contact with the tooth base 10.

The overlap portion 9a has two thin portions from the end portion 251a of one side 24a of the outer peripheral wall 21a to the end portion 291a of one side 28a of the inner peripheral wall 22a through the tunnel-shaped leg portion (bottom portion) of the connecting portion 23a. 7a (first thin-walled portion). Moreover, it can be said that the overlap part 9a is provided in the upper part of the outer peripheral wall 21a, the inner peripheral wall 22a, and the connection part 23a along these shapes. The overlap portion 9a has a structure that couples the insulator member 1a and the insulator member 1b. Details will be described later.

Next, the insulator member 1b will be described.

FIG. 5A is a plan view of an insulator member 1b according to the embodiment. FIG. 5B is a cross-sectional view of the insulator member 1b according to the embodiment. 5B is a cross-sectional view taken along line 5B-5B in FIG. 5A.

The insulator member 1b has basically the same shape as the insulator member 1a, but the side sides 27b and 31b are shorter than the side sides 27a and 31a.

As shown in FIGS. 3A, 3B, 5A, and 5B, the insulator member 1b includes an outer peripheral wall 21b, an inner peripheral wall 22b, a connecting portion 23b, and an overlap portion 9b.

The outer peripheral wall 21b has a rectangular plate shape, and comes into contact with the inner peripheral surface 12a of the yoke portion 12 at the outer peripheral surface 211b. Further, the outer peripheral wall 21b is provided with a notch 26b from the one side 24b toward the other side 25b facing the one side 24b. The notch 26b has a U-shape as a whole at the edge 261b and the bottom 40b. Two side edges 27b adjacent to one side 24b and the other side 25b of the outer peripheral wall 21b are provided with outer ribs 3b over the entire side edge 27b (from the upper end to the lower end in FIG. 3A).

The inner peripheral wall 22b has a rectangular plate shape, and abuts on the outer peripheral surface 12b of the flange 11 at the inner peripheral surface 221b. Further, the inner peripheral wall 22b is provided with a notch 30b from the one side 28b toward the other side 29b facing the one side 28b. The notch 30b has a U-shape as a whole at the edge portion 301b and the bottom portion 40b. Two side edges 31b adjacent to one side 28b and the other side 29b of the inner peripheral wall 22b are provided with inner ribs 2b over the entire side 31b.

The connecting portion 23b connects the edge portion 261b of the notch 26b in the outer peripheral wall 21b and the edge portion 301b of the notch 30b in the inner peripheral wall 22b with the notch direction aligned and spaced apart from each other. In other words, the connecting portion 23b has a tunnel shape having a certain distance in the radial direction. The T-shaped portion 18 can be fitted into the insulator member 1b by bringing the inner periphery of the connecting portion 23b in the tunnel shape into contact with the tooth base 10.

The overlapping portion 9b includes two thin-walled portions 7b (from the end portion 251b of the one side 24b of the outer peripheral wall 21b to the end portion 291b of the one side 28b of the inner peripheral wall 22b through the tunnel-shaped leg portion of the connecting portion 23b. 2 thin part). Moreover, it can be said that the overlap part 9b is provided in the upper part of the outer peripheral wall 21b, the inner peripheral wall 22b, and the connection part 23b according to these shapes. The overlap portion 9b has a structure that couples the insulator member 1a and the insulator member 1b.

Next, a structure for coupling the insulator member 1a of the

overlap portions

9a and 9b and the insulator member 1b will be described.

The insulator member 1a and the insulator member 1b each have a resin thick portion 6 as shown in FIGS. 4B and 5B.

In the present embodiment, the resin thick portion 6 has a thickness of about 0.6 mm. In order to secure the insulation distance between the T-shaped portion 18 and the winding 13, the resin thick portion 6 extends from the inner peripheral surface 12 a of the yoke portion 12 through the side surfaces 12 c and 12 d of the tooth base portion 10. It is provided in a portion facing (contacting) the T-shaped portion 18 continuously to the outer peripheral surface 12b. In other words, the contact surface of the T-shaped portion 18 with the outer peripheral wall 21a, the inner peripheral wall 22a, and the connecting portion 23a is configured by the resin thick portion 6 except for the thin portion 7a. Moreover, the contact surface of the T-shaped part 18, and the outer peripheral wall 21b, the inner peripheral wall 22b, and the connection part 23b is comprised by the resin thick part 6 except for the thin part 7b.

The overlap part 9 includes an overlap part 9a and an overlap part 9b. When the overlap portion 9a and the overlap portion 9b are engaged, the insulator member 1a and the insulator member 1b are coupled. The overlap portion 9a and the overlap portion 9b are engaged by the thin portion 7a and the thin portion 7b, respectively, at the portions in contact with each other.

That is, as shown in FIG. 4B, for example, the thin portion 7a constituting the overlap portion 9a extends from the contact surface 32 where the insulator member 1a and the insulator member 1b are in contact with each other toward the side 24a. The thin part 7a has a thickness of 0.3 mm, which is about half of the resin thick part 6 in the axial direction over the entire circumference of the overlap part 9a.

Moreover, the thin part 7b which comprises the overlap part 9b is extended toward the one side 24b from the contact surface 32, as shown, for example in FIG. 5B. The thin portion 7b has a thickness of 0.3 mm, which is about half that of the resin thick portion 6, in the axial direction over the entire circumference of the overlap portion 9b.

When the insulator member 1a and the insulator member 1b are fitted into the T-shaped portion 18, the overlap portion 9a and the overlap portion 9b are opposed to each other, and the notch 26a and the notch 26b are brought into contact with the tooth base portion 10. Insert while. Then, the insulator member 1a and the insulator member 1b are engaged by overlapping the thin portion 7a of the insulator member 1a and the thin portion 7b of the insulator member 1b facing each other over the entire circumference of the overlap portion 9. The overlap portion 9 has the thin portion 7a on the winding 13 side and the thin portion 7b on the T-shaped portion 18 side, and the thin portion 7a and the thin portion 7b overlap each other, so that there is no step. In addition, the thickness is substantially the same as that of the resin thick portion 6. With this overlap structure, the insulator member 1a and the insulator member 1b can cover the T-shaped portion 18 with no overlap with no overlap.

Further, the insulator member 1a and the insulator member 1b include

inner ribs

2a and 2b that bulge from the circumferential ends of the flange portion 11 to the outer circumferential side, and outer ribs 3a that bulge from the circumferential ends of the yoke portion to the inner circumferential side. 3b, respectively.

Since the

inner ribs

2a and 2b are both provided over the

entire sides

31a and 31b, they are continuously formed from the front surface 19 to the rear surface 20 of the T-shaped portion 18 when the insulator 1 shown in FIG. 3B is formed.

Since the

outer ribs

3a and 3b are both provided over the

entire sides

27a and 27b, the

outer ribs

3a and 3b are continuously formed from the front surface 19 to the rear surface 20 of the T-shaped portion 18 when the insulator 1 shown in FIG. 3B is formed.

The inner rib 2 and the outer rib 3 are configured to be thicker than the contact surface with the T-shaped portion 18, that is, the resin thick portion 6. For example, the inner rib 2 and the outer rib 3 are thicker than the resin thick portion 6 from the viewpoint of strength to support the wound winding wire 13, the inner rib 2 is about 1 mm, and the outer rib 3 is about 2.5 mm. Having a thickness of

As shown in FIG. 4A, the inner rib 2a and the outer rib 3a are provided with

thin portions

7a and 7b extending from the tip of the inner rib 2a to the tip of the outer rib 3a. And the thin part corresponding to the inner side rib 2a and the outer side rib 3a is thicker than the

thin part

7a, 7b, and is distinguished as the tip thin part 33. Similarly to the overlap portion 9, the distal thin portion 33 also engages with the corresponding distal thin portion to form the inner rib 2 and the outer rib 3 without a step.

The inner rib 2 and the outer rib 3 can ensure an insulation distance without causing a gap even after the engagement due to the engagement of the thin tip portion 33. In addition, it is possible to suppress the warpage of the forming problem that is frequently generated at the end portion of the thin portion. This leads to prevention of a step when the insulator member 1a and the insulator member 1b are engaged due to the cause of the warp, so that it is possible to prevent disconnection when the winding 13 is wound.

As shown by arrows 36 in FIGS. 4A and 5A, the inner rib 2 bulges from the circumferential end of the flange portion 11 toward the circumferential end of the yoke portion 12 facing the inner rib 2. In other words, the extension line in the bulging direction of the inner rib 2 intersects the yoke portion 12 to which the same insulator 1 is attached. In addition, when the yoke part 12 comprises the continuous integral shape, it is on the yoke part 12, Comprising: The position of equidistant from the adjacent tooth base 10 is prescribed | regulated as a circumferential direction edge part.

The outer rib 3 bulges further outward from the circumferential end of the flange 11 facing the circumferential end of the yoke 12 as shown by the arrow 37 in FIGS. 4A and 5A. In other words, the extension line of the outer rib 3 in the bulging direction does not intersect with the flange portion 11 to which the same insulator 1 is attached. Note that the outside includes, for example, the inner peripheral side tip 35 of the tooth base 10 in the adjacent T-shaped portion 18. For convenience, the inner peripheral side tip 35 in FIGS. 4A and 5A shows the T-shaped portion 18 itself.

FIG. 6 is a partial radial cross-sectional view of the stator according to the embodiment. As shown in FIG. 6, the inner rib 2 and the outer rib 3 are provided for all the insulators 1. Thereby, it is necessary for the iron core 16 on the yoke part 12 side that is a non-charging part and the iron core 16 on the flange part 11 side and the winding 13 that is a charging part even after winding the winding 13 without additional members. An insulation distance can be secured.

Further, in such a winding process of the winding around the iron core 16, it is preferable to wind from the flange portion 11 side. That is, since the collar part 11 is narrower in the circumferential direction than the yoke part 12, the winding work is easy. Furthermore, since the inner rib 2 bulges toward the end in the circumferential direction of the facing yoke part 12, a space for winding work from the flange part 11 side is secured. Moreover, since the outer rib 3 bulges further outward than the circumferential end portion of the opposite flange portion 11, a space for winding work from the flange portion 11 side is secured. Accordingly, the winding work from the side of the flange portion 11 is facilitated.

The electric motor according to the present invention can secure an insulation distance by providing ribs on the inner peripheral side and outer peripheral side of an insulator, which is an insulating material, and improves the assembly of the insulator, and disconnection failure when winding the insulator around the insulator. Since it can be greatly reduced, it is useful as an electric motor used in home appliances and the like.

DESCRIPTION OF SYMBOLS 1,110 Insulator

1a Insulator member

1b Insulator member

2, 2a,

2b Inner rib

3, 3a, 3b Outer rib 6 Resin

thick part

7a, 7b

Thin part

9, 9a, 9b Overlap part 10

Tooth base part

11, 112 collar part DESCRIPTION OF SYMBOLS 12 Relay part 13,113 Winding 14 Stator 15 Electric motor 16 Iron core 17 Rotating shaft 18 T-shaped part 19 Front surface 20

Back surface

21a, 21b Outer

peripheral wall

22a, 22b Inner

peripheral wall

23a,

23b Connection part

24a, 24b, 28a, 28b One

side

25a, 25b, 29a, 29b

Other side

26a, 26b, 30a,

30b Notch

27a, 27b, 31a, 31b Side side 32 Contact surface 33 Tip thin part

Claims

A yoke portion provided on the outer peripheral side, a tooth base portion extending from the yoke portion toward the inner peripheral side, and a flange portion extending from the inner peripheral side tip portion of the tooth base portion to both sides in the circumferential direction. An insulator covering an iron core having a plurality of T-shaped portions provided,
An inner rib that bulges from the circumferential ends of the flange to the outer peripheral side;
And an outer rib that bulges from the circumferential ends of the yoke portion toward the inner circumferential side.
The inner rib and the outer rib are
The insulator according to claim 1, wherein the insulator is provided continuously from a front surface side constituting the T-shaped portion to a back surface side facing the front surface.
The inner rib is
Bulges from the circumferential end of the flange toward the circumferential end of the facing yoke,
The outer rib is
The insulator according to claim 1, wherein the insulator bulges further outward than a circumferential end of the flange facing from the circumferential end of the yoke portion.
The insulator according to claim 3, wherein the outer side is a distal end portion on the inner peripheral side of a tooth base portion in an adjacent T-shaped portion.
The insulator is
A first insulator member that is inserted from the front surface side of the T-shaped portion of the iron core;
A second insulator member fitted from the back side facing the front surface,
The first insulator member has a first thin portion that is thinner than a thickness of a contact surface that comes into contact with the tooth base portion at a tip portion facing the second insulator member,
The second insulator member has a second thin portion that is thinner than a thickness of a contact surface in contact with the tooth base portion at a tip portion facing the first insulator member,
5. The apparatus according to claim 1, wherein the first thin-walled portion and the second thin-walled portion are engaged with each other to have an overlap structure that couples the first insulator member and the second insulator. 6. Insulator.
The thin portion is
The insulator according to claim 5, wherein the insulator is provided from a tip of the inner rib to a tip of the outer rib as viewed in a cross section perpendicular to the rotation axis of the iron core.
The thickness of the inner rib and the outer rib is:
Thicker than the thickness of the contact surface that contacts the tooth base of the iron core,
The thickness of the tip thin portion corresponding to the inner rib and the outer rib is:
The insulator according to claim 6, wherein the insulator is thicker than the thin portion.
A yoke portion provided on the outer peripheral side, a tooth base portion extending from the yoke portion toward the inner peripheral side, and a collar portion extending from the inner peripheral side tip portion of the tooth base portion to both sides in the circumferential direction. And an iron core having a plurality of T-shaped parts,
The insulator according to claim 1 provided over the entire circumference of the iron core;
An electric motor comprising a winding wound around the insulator.
The air blower provided with the electric motor of Claim 8.