WO2017094103A1

WO2017094103A1 - Rotary electric machine and manufacturing method therefor

Info

Publication number: WO2017094103A1
Application number: PCT/JP2015/083737
Authority: WO
Inventors: 一生大内田
Original assignee: 三菱電機株式会社
Priority date: 2015-12-01
Filing date: 2015-12-01
Publication date: 2017-06-08

Abstract

A stator iron core of this rotary electric machine has an annular yoke section and multiple tooth parts protruding inward in a radial direction from the yoke section. Multiple bobbins are attached to the tooth parts, respectively. Multiple coils are disposed on the outer peripheries of the bobbins, respectively. Multiple insulating members are made of a heat-shrinkable material and cover the outer peripheries of the coils, respectively.

Description

Stator for rotating electric machine and method for manufacturing the same

The present invention relates to a stator of a rotating electrical machine in which a bobbin is mounted on a plurality of teeth provided on an iron core, and a coil is formed by winding a coil wire around each bobbin, and a method for manufacturing the same. .

In a conventional stator of a rotating electric machine, if the insulating coating is worn down by rubbing between coil wires due to electromagnetic vibration, a short circuit may occur due to poor insulation. For this reason, the coil is more firmly fixed to suppress vibration, and various measures are taken to ensure insulation between the coils.

As a method of fixing the coil more firmly, for example, a method of fixing a coil wire through a string in a notch provided in an insulator (for example, see Patent Document 1) and a method of impregnating a varnish (for example, Patent Document 2) For example).

Moreover, as a method of ensuring insulation between adjacent coils, there are a method of resin-molding a coil (see, for example, Patent Document 3), a method of inserting an insulating member between coils (see, for example, Patent Document 4), and the like. Are known.

JP 2009-290985 A JP 2012-55134 A JP 2009-232522 A JP 2002-171704 A

Among the conventional rotating electrical machine stators as described above, the stator of Patent Document 1 requires a string to pass through each coil, which increases the number of mounting steps. In addition, since the entire circumference of the coil cannot be covered, the coil surface cannot be protected from conductive contaminants and external damage.

In addition, in the stator of Patent Document 2, it takes a long time for the heat treatment for impregnation with varnish, the work for removing the varnish in the adhesion unnecessary portion occurs as a post process, and environmental pollution due to the use of volatile organic compounds (VOC). There was a problem that there was a fear of.

Furthermore, the stator of Patent Document 3 has a problem in that the burden on the cost of molds, equipment, materials, etc. is large for resin molding.

Furthermore, the stator of Patent Document 4 has a problem in that the positioning process when inserting the insulating member and the mounting process of the insulating member are increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. A stator of a rotating electrical machine that can easily suppress vibration of a coil and easily ensure insulation between the coils, and its manufacture. The purpose is to obtain a method.

The stator of the rotating electrical machine according to the present invention includes an iron core having an annular yoke portion and a plurality of tooth portions protruding radially inward from the yoke portion, and a plurality of teeth respectively mounted on the tooth portions. Bobbin, a plurality of coils provided on the outer periphery of the bobbin, and a plurality of insulating members made of a heat-shrinkable material and covering the outer periphery of the coil.
The method of manufacturing a stator of a rotating electrical machine according to the present invention includes a step of attaching bobbins to a plurality of teeth of an iron core, a step of providing a plurality of coils on the outer periphery of the bobbin, and a plurality of insulations made of a heat-shrinkable material. A step of covering the outer periphery of the coil with the member, and a step of heating and contracting the insulating member.

The stator of the rotating electrical machine and the manufacturing method thereof according to the present invention insulates the coils using an insulating member made of a heat-shrinkable material, so that the coil can be easily vibrated only by heating and contracting the insulating member. While suppressing, insulation between coils can be ensured easily.

It is a perspective view which shows the state in the middle of manufacture of the stator by Embodiment 1 of this invention. It is a cross-sectional view of the tooth | gear part, bobbin, coil, and insulation member of FIG. It is a cross-sectional view of the principal part of the stator of the rotary electric machine by Embodiment 2 of this invention. It is a perspective view which expands and shows the spacer of FIG. It is a cross-sectional view of the principal part of the stator of the rotary electric machine by Embodiment 3 of this invention.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
1 is a perspective view showing a state in the middle of manufacturing a stator according to Embodiment 1 of the present invention. In the figure, the iron core 1 has an annular yoke portion 1a and a plurality of tooth portions 1b projecting radially inward from the yoke portion 1a. The tooth parts 1b are arranged at equal intervals in the circumferential direction of the yoke part 1a.

A bobbin 2 made of an insulating material is attached to each tooth portion 1b. Each bobbin 2 is configured by combining two divided pieces, and covers the outer periphery of the tooth portion 1b excluding the end surface of the tooth portion 1b opposite to the yoke portion 1a.

Each bobbin 2 includes a first flange portion 2a located at an end portion on the yoke portion 1a side, a second flange portion 2b located at an end portion on the opposite side to the yoke portion 1a, and a first flange. It has the cylindrical intermediate part 2c (FIG. 2) located between the part 2a and the 2nd flange part 2b.

The coil 3 is provided on the outer periphery of the intermediate portion 2c of each bobbin 2 by winding a coil wire. The outer periphery of each coil 3 is covered with a tubular insulating member 4 that insulates between the coils 3. FIG. 1 shows a state in which only one coil 3 is covered with an insulating member 4.

The insulating member 4 is made of a heat-shrinkable sheet material, shrinks when heated, and covers the entire outer periphery of the coil 3 while being in close contact with the outer periphery of the coil 3. However, FIG. 1 shows a state before the insulating member 4 is heated.

The first flange portion 2a of each bobbin 2 is provided with one or more first flange protrusions 2d. In FIG. 1, one first flange protrusion 2 d is provided on each of one side and the other side in the axial direction of the stator.

The second flange portion 2b of each bobbin 2 is provided with one or more second flange protrusions 2e. In FIG. 1, two second flange protrusions 2e are provided on each of one side and the other side in the axial direction of the stator.

The insulating member 4 is provided with a plurality of flange protrusion insertion holes 4a into which the first and

second flange protrusions

2d and 2e are inserted.

FIG. 2 is a cross-sectional view of the tooth portion 1b, bobbin 2, coil 3 and insulating member 4 of FIG. ing. In FIG. 2, the left half shows a state before contraction of the insulating member 4, and the right half shows a state after contraction of the insulating member 4. A gap exists between the coil 3 and the insulating member 4 before the insulating member 4 contracts. After the insulating member 4 contracts, the insulating member 4 is in close contact with the coil 3.

Next, a method for manufacturing the stator will be described. The bobbin 2 is attached to the tooth portion 1b of the iron core 1 and fixed. Subsequently, the coil 3 is formed by winding a coil wire around the intermediate portion 2 c of the bobbin 2.

Thereafter, the tooth portion 1b, the bobbin 2 and the coil 3 are inserted into the insulating member 4, and the outer periphery of the coil 3 is covered with the insulating member 4. At this time, the first and

second flange protrusions

2 d and 2 e are inserted into the flange protrusion insertion holes 4 a of the insulating member 4. In this state, the insulating member 4 is heated and contracted. The mounting and heating of the insulating member 4 may be performed one by one or two or more. Further, after all the insulating members 4 are mounted, all the insulating members 4 may be simultaneously heated and shrunk.

In such a stator of a rotating electric machine and a method for manufacturing the same, since the insulating members 4 made of a heat-shrinkable material are used to insulate the coils 3 from each other, the insulating members 6 can be simply contracted by heating the insulating members 4. By tightening the coil 3, the vibration of the coil 3 can be easily suppressed. Further, the entire outer periphery of the coil 3 can be covered with the insulating member 6, and insulation between the coils 3 can be easily ensured.

Moreover, the insulation member between the adjacent coils 3 and its attachment process become unnecessary.
Furthermore, the surface of the coil 3 can be protected from conductive contaminants and external damage.

Furthermore, since the tubular insulating member 4 is used, the insulating member 4 can be easily mounted.
Further, since the first and

second flange protrusions

2d and 2e are provided on the bobbin 2, and the flange protrusion insertion hole 4a is provided on the insulating member 4, positioning of the insulating member 4 is facilitated. In addition, the contraction of the insulating member 4 in the axial direction of the coil 3 (the radial direction of the iron core 1) can be suppressed, and the entire outer periphery of the coil 3 can be covered and tightened more reliably.

In the above example, the bobbin 2 divided into two parts is shown. However, the bobbin may be an integrally formed cylindrical part.
Further, the number of the first and

second flange protrusions

2d and 2e is not limited to the above example.
Furthermore, if the position of the insulating member 6 can be fixed at the time of heat shrinkage, both or one of the first and

second flange protrusions

2d and 2e may be omitted.

Embodiment 2. FIG.
Next, FIG. 3 is a cross-sectional view of the main part of the stator of the rotating electrical machine according to Embodiment 2 of the present invention, and shows a cross section corresponding to the same cross section as FIG. Also in FIG. 3, the left half shows the state before the insulating member 4 contracts, and the right half shows the state after the insulating member 4 contracts.

A plurality of spacers 5 are interposed between the outer periphery of each coil 3 and the insulating member 4. In this example, one spacer 5 is arranged on one side and the other side of the axial direction (vertical direction in FIG. 3) of the iron core 1 so as to sandwich the coil 3. Each spacer 5 is attached to the outer periphery of the coil 3 by an adhesive, for example.

FIG. 4 is an enlarged perspective view showing the spacer 5 of FIG. Each spacer 5 has a block-shaped spacer main body 5a and a plurality of spacer protrusions 5b provided on the spacer main body 5a. In this example, two spacer protrusions 5b are arranged at an interval in the axial direction of the coil 3 (direction perpendicular to the paper surface of FIG. 3).

Each spacer protrusion 5b is provided at a base end 5c connected to the spacer main body 5a and an end opposite to the spacer main body 5a, and has a return portion 5d having a larger diameter than the base end 5c. have. The insulating member 4 is provided with a plurality of spacer protrusion insertion holes 4b into which the spacer protrusions 5b are inserted.

At the time of manufacturing the stator, the spacer 5 is disposed on the outer periphery of the coil 3 and then the insulating member 4 is placed on the outer periphery of the coil 3 and the spacer 5. At this time, the first and

second flange protrusions

2d and 2e are inserted into the flange protrusion insertion hole 4a, and the spacer protrusion 5b is inserted into the spacer protrusion insertion hole 4b. Other configurations and manufacturing methods are the same as those in the first embodiment.

The same effect as that of the first embodiment can be obtained by such a stator of a rotating electric machine. Further, since the spacer 5 is interposed between the coil 3 and the insulating member 4, the tightening force for the coil 3 is ensured even when the shrinkage rate of the insulating member 4 with respect to heat is low or the diameter of the coil 3 is small. can do.

In addition, since the return portion 5d is provided on the spacer projection 5b, the insulating member 4 is difficult to be removed, and the workability is improved.

In the second embodiment, the return portion 5d is provided on the spacer protrusion 5b, but the return portion may be provided on the flange protrusion.
Further, the number of spacers for each coil and the number of spacer protrusions in each spacer are not limited to the above example.
Furthermore, when the spacer protrusion 5b is provided on the spacer 5, at least one of the first and

second flange protrusions

2d and 2e may be omitted. Conversely, only the first and

second flange protrusions

2d and 2e may be provided, and the spacer protrusion 5b may be omitted.

Embodiment 3 FIG.
FIG. 5 is a cross-sectional view of the main part of the stator of the rotating electric machine according to Embodiment 3 of the present invention, and shows a cross section corresponding to the same cross section as FIG. In this example, a sheet-like insulating member 6 made of a heat-shrinkable material is wound around the outer periphery of the coil 3. FIG. 5 shows a state before the insulating member 6 is contracted. The insulating member 6 is provided with a plurality of flange protrusion insertion holes 6a into which the first and

second flange protrusions

2d and 2e are inserted.

When the insulating member 6 is wound around the outer periphery of the coil 3, the

flange protrusions

2 d and 2 e are inserted into the flange protrusion insertion holes 6 a provided at the beginning of winding, and the insulating member 6 is wound around the outer periphery of the coil 3. Thereafter, the

same flange protrusions

2d and 2e as the start of winding are inserted into the flange protrusion insertion holes 6a provided at the end of winding.

Thereafter, the insulating member 6 is heated and contracted. Thereby, the insulating member 6 covers the entire outer periphery of the coil 3 while being in close contact with the outer periphery of the coil 3. Other configurations and manufacturing methods are the same as those in the first embodiment.

The same effect as that of the first embodiment can be obtained by such a stator of a rotating electric machine. In addition, since the sheet-like insulating member 6 is used, the limitation on the peripheral length of the insulating member 6 can be easily eliminated, and the axial length of the iron core 1 and the width of the tooth portion 1b can be easily changed. The outer periphery of the coil 3 can be tightened more reliably.

Note that the insulating member 6 shown in the third embodiment can also be applied to the case where the spacer 5 shown in the second embodiment is used. In this case, a plurality of spacer protrusion insertion holes may be provided in the insulating member 6, and the spacer protrusions may be inserted into these spacer protrusion insertion holes.

Claims

An iron core having an annular yoke portion and a plurality of teeth protruding radially inward from the yoke portion,
A plurality of bobbins respectively attached to the teeth,
A stator of a rotating electrical machine comprising a plurality of coils provided on the outer periphery of the bobbin and a plurality of insulating members made of a heat-shrinkable material and covering the outer periphery of the coil.
The bobbin has a first flange portion located at an end portion on the yoke portion side and a second flange portion located at an end portion on the opposite side to the yoke portion, respectively.
The first flange portion is provided with a first flange protrusion,
The second flange portion is provided with a second flange protrusion,
The stator for a rotating electrical machine according to claim 1, wherein the insulating member is provided with a plurality of flange protrusion insertion holes into which the first and second flange protrusions are inserted.
The stator for a rotating electrical machine according to claim 1 or 2, further comprising a spacer interposed between the coil and the insulating member.
The spacer is provided with a spacer protrusion,
The stator of the rotating electrical machine according to claim 3, wherein the insulating member is provided with a spacer protrusion insertion hole into which the spacer protrusion is inserted.
The stator for a rotating electric machine according to any one of claims 1 to 4, wherein the insulating member is in a tube shape.
The stator for a rotating electrical machine according to any one of claims 1 to 4, wherein the insulating member is a sheet-like member wound around an outer periphery of the coil.
Attaching a bobbin to each of the teeth of the iron core;
Providing a plurality of coils on the outer periphery of the bobbin,
The manufacturing method of the stator of a rotary electric machine including the process of each covering the outer periphery of the said coil with the some insulating member consisting of a heat-shrinkable material, and the process of heating and shrinking the said insulating member.
The step of covering the outer periphery of the coil with the insulating member inserts a plurality of flange protrusions provided on the flange portion of the bobbin into a plurality of flange protrusion insertion holes provided on the insulating member. A method for manufacturing a stator of a rotating electric machine according to claim 7.
The method of manufacturing a stator for a rotating electrical machine according to claim 7 or 8, wherein the insulating member is contracted after a spacer is interposed between the coil and the insulating member.
The step of covering the outer periphery of the coil with the insulating member inserts a plurality of spacer protrusions provided on the spacer into a plurality of spacer protrusion insertion holes provided on the insulating member. A method of manufacturing a stator of a rotating electric machine.