JP2000152527A - Armature of motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a pin hole, or recession, or peeling of insulating coating, and enable a thick cable to be used for winding, by providing an armature with a hole in stack direction within the face between the slot of an armature iron core and the rotary shaft insertion hole. SOLUTION: This armature is provided with through holes 1a bored in, for example, four places in stack direction within the face between the slot of its iron core 1 and a rotary shaft insertion hole 4. Accordingly, in case that heat is added in the pretreatment of an electrostatic powder coating process to the armature iron core 1 provided with through holes 1a and the rotary shaft 3, the heat is conducted into the iron core 1 of the armature, too, through the through hole 1a, and the oil in between electromagnetic steel plates or the oil between the rotary shaft 3 inserted into the rotary shaft insertion hole 4 and the iron core 1 of the armature is gasified. Accordingly, the oil removal treatment can be performed enough and quickly, and a pin hole or recession ceases to occur in the insulating coating by electrostatic powder coating material, and the peeling of the insulating coating can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an armature of an electric motor used for a rotating electric machine such as a vacuum cleaner and a power tool.

[0002]

2. Description of the Related Art In recent years, electric motors have tended to be smaller and have larger capacities, and the performance issues of armatures used therein have also been required to be smaller, have higher efficiency and have higher output. In particular, in commutator motors used for vacuum cleaners, thicker windings are being developed to meet the demands. This armature is shown in FIG.
As shown in the figure, an armature core 1 formed by laminating thin electromagnetic steel sheets having a thickness of 0.2 to 0.5 mm and caulking by pressing, for example.
, Excluding the outer peripheral surface forming the magnetic pole surface of the armature core 1 (see FIGS. 54, 55 and 56), the inside of the slot 2 (see FIG. 57), and the rotation shaft insertion of the armature core 1 The surface of the rotating shaft 3 (see FIG. 56) inserted into the hole 4 is coated with an insulating coating film 12 by electrostatic powder coating.

Here, a description will be given of a conventionally known electrostatic powder coating of an armature core. FIG. 58 is a view schematically showing a system of electrostatic powder coating, and FIG. 59 is a flowchart showing a method of electrostatic powder coating. In the figure, reference numeral 21 denotes an electrostatic powder coating unit; Is electrostatic powder,
Numeral 24 denotes a vacuum masking system, and the armature core 1
Powder 23 attached to the outer peripheral surface forming the magnetic pole surface
Is mechanically scraped off with, for example, a spatula or sucked by a suction machine.

[0004] In the electrostatic powder coating, first, a pretreatment for removing oil is started. This impairs the stability and adhesion of the insulating coating film 12, such as press oil at the time of press working attached to the surface of the armature core 1, lubricating oil applied to the rotating shaft 3, and the like. This is a treatment for removing a substance, which is removed by hot air convection or by heating in an infrared atmosphere furnace, a high-frequency heating device, or the like.

Next, the pretreated armature core 1 and rotating shaft 3 are cooled at room temperature, and thereafter, the process proceeds to an electrostatic powder coating process. Here, the armature core 1 is chucked and rotated by a dedicated protective jig, and the charged electrostatic powder 23 having a constant particle size distribution is sprayed from the coating nozzle 22 of the electrostatic powder coating unit 21. I do.

Then, the process for removing the electrostatic powder 23 is started.
The electrostatic powder 2 attached to the outer peripheral surface of the armature core 1 coated with the electrostatic powder in the vacuum masking system 24
3 is removed. By this removal, both ends of the armature core 1, the inside of the slot 2 and the center of the rotating shaft 3 are coated with the electrostatic powder 13.

After that, the process shifts to a high-frequency heating step. In this step, the armature core 1 coated with the electrostatic powder 23 is passed through the skid coil of the high-frequency heater while rotating, where it is heated from room temperature to 270 ° C. in about one minute.
By this heating, the paint particles on the surfaces of the armature core 1 and the rotating shaft 3 are melted and fixed, and in the next cooling step, they are forcibly cooled to room temperature by compressed air or a blower, and then after-cured. Note that, depending on the coating conditions, the high-frequency heating and cooling steps may be repeated twice or more.

[0008]

However, when the insulating coating film 12 is formed by the method described above, the armature core 1
In some cases, the insulating coating film 12 at the joining portion between the shaft and the rotating shaft 3 is peeled or pulled off, and pinholes may be generated between the joining portion and the insulating coating film 12 inside the slot 2 of the armature core 1. These factors are due to insufficient removal of press oil attached to the surface of the armature core 1 or between the laminated steel plates, lubricating oil attached to the surface of the rotating shaft 3, and the like, particularly in the pretreatment.

The pinhole is caused by a temperature difference caused by a difference in the material of the armature core 1 and the rotating shaft 3 generated when the electrostatic powder 23 is melted and fixed by high-frequency heating, and is permitted by the Electrical Appliance and Material Control Law. Was not. In addition, the peeling or shrinking of the insulating coating film 12 is caused particularly by the lubricating oil, and as described above, is affected by the temperature difference due to the difference in the material and the insufficient heating, which causes insulation failure.

There is an oil removal treatment using a solvent instead of the pretreatment by heating. However, at present, it is difficult to use the solvent due to environmental problems, and an armature is used instead of the above-mentioned insulation by electrostatic powder coating. There is a method in which a molded heat-resistant resin is attached to both end surfaces of the iron core 1 and a heat-resistant resin or the like is inserted into the slot 2 to insulate the core. However, there is a limit in reducing the thickness of the heat-resistant resin. For example, when the thickness was smaller than 1.5 mm, warpage, short-circuiting, burrs, and the like occurred, and the film could not be used. This 1.5 mm is 6 times thicker than the 0.25 mm thickness of the insulating coating film 12 formed by electrostatic powder coating, which is disadvantageous for winding a thick wire as compared with the case of electrostatic powder coating. Also,
A method of thickening the insulating coating film 12 inside the slot 2 by electrostatic powder coating is conceivable, but also in this case, there is a possibility that a thick wire cannot be wound.

Further, when winding the thick wire into the slot 2, the wire is dropped from the narrow slot opening, so that the wire may be wound while being in contact with the armature core 1. In some cases, it deteriorated.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and it is possible to prevent pinholes, shrinkage, and peeling of an insulating coating film even with a conventional insulating method using electrostatic powder coating, and furthermore, a winding method. It is an object of the present invention to provide an armature of a motor that can use a thick wire.

[0013]

According to a first aspect of the present invention, there is provided an armature for an electric motor, wherein a hole in a laminating direction is provided in a plane between a slot of an armature core and a rotary shaft insertion hole. It is.

According to a second aspect of the present invention, there is provided an armature for an electric motor, comprising: a groove in the lamination direction provided on an inner peripheral surface of a rotary shaft insertion hole of an armature core; A projection provided to be longer than the thickness of the iron core and guided by a gap in the groove when the rotary shaft is inserted into the rotary shaft insertion hole.

According to a third aspect of the present invention, there is provided an armature of a motor, wherein a step set at least longer than the thickness of the armature core is provided on the outer peripheral surface of the rotating shaft.

An armature of a motor according to a fourth aspect of the present invention is provided with an axial groove portion provided on an outer peripheral surface of a rotating shaft.

The armature of the electric motor according to the invention of claim 5 of the present invention is provided with a cutout extending in the axial direction at least longer than the thickness of the armature core on the outer peripheral surface of the rotating shaft.

An armature of a motor according to a sixth aspect of the present invention is provided with a groove in which an inner peripheral surface of a rotary shaft insertion hole of an armature iron core is formed as an internal gear.

According to a seventh aspect of the present invention, in the armature of the electric motor, an axial groove extending in the axial direction at least longer than the thickness of the armature core is provided at a plurality of circumferential positions on the outer peripheral surface of the rotating shaft. Things.

The armature of the electric motor according to the invention of claim 8 of the present invention is provided with a hole extending toward the rotary shaft insertion hole at the bottom of at least one slot of the armature core.

According to a ninth aspect of the present invention, the armature of the electric motor comprises a heat-resistant resin having air permeability between the rotation shaft insertion hole of the armature core and the rotation shaft inserted into the rotation shaft insertion hole. It is provided.

According to a tenth aspect of the present invention, there is provided an armature for an electric motor, comprising: a groove in the stacking direction provided on an inner peripheral surface of a rotary shaft insertion hole of an armature core; and an oil absorbing member inserted into the groove. It is provided with.

The armature of the electric motor according to the eleventh aspect of the present invention is obtained by laminating one side of a steel plate constituting an armature core by blasting.

The armature of a motor according to a twelfth aspect of the present invention is characterized in that the rotary shaft insertion hole is provided in one surface between the slot of the steel plate laminated to form the armature core and the rotary shaft insertion hole. A groove is provided radially as a center.

According to a thirteenth aspect of the present invention, there is provided an armature for a motor, wherein a slit extending in the central axis direction of the rotary shaft insertion hole from the bottom of the slot in a plane between the slot of the armature core and the rotary shaft insertion hole. Is provided.

According to a fourteenth aspect of the present invention, there is provided an armature for a motor, wherein a slit extending from the outer periphery in the plane between the outer periphery of the armature core and the rotation shaft insertion hole in the central axis direction of the rotation shaft insertion hole. Is provided.

The armature of the electric motor according to the invention of claim 15 of the present invention is characterized in that the armature core is formed by caulking at least steel plates located at both ends so that the burrs at the time of punching face each other. is there.

An armature of a motor according to a sixteenth aspect of the present invention is provided with a concave portion for inserting a wedge on an opposing surface above a slot of an armature core.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. FIG. 1 is a side view of an armature showing a partial half section of an armature core according to Embodiment 1 of the present invention, FIG. 2 is a front view of the armature core, and FIG.
It is an enlarged view of a part. In the first embodiment, through holes 1a having a diameter of 0.5 mm, for example, formed at four locations in the lamination direction in the plane between the slots 2 of the armature core 1 and the rotary shaft insertion holes 4 are provided.

Armature core 1 provided with this through hole 1a
When heat is applied to the rotating shaft 3 in the pretreatment of the electrostatic powder coating process, the heat is also transmitted to the inside of the armature core 1 through the through hole 1a. Therefore, oil trapped between the electromagnetic steel plates and oil between the rotating shaft 3 inserted into the rotating shaft insertion hole 4 and the armature core 1 are vaporized by heat.

As described above, since the through-hole 1a is provided in the armature core 1 so that heat is also transmitted to the inside of the armature core 1, the oil removal treatment can be performed sufficiently and quickly.
For this reason, the insulating coating film 12 formed by electrostatic powder coating is free from pinholes and shrinkage, and has the effect of preventing the insulating coating film 12 from peeling off.

In this embodiment, the number of the through holes 1a is four, but the number may be set according to the size of the armature core 1. In addition, although the hole is the through hole 1a, the hole need not penetrate the surface of the armature core 1.

Embodiment 2 4 is a side view of the armature showing a partial half cross section of the armature core according to the second embodiment of the present invention, FIG. 5 is a front view of the armature core, and FIG. 6 is an enlarged view of a portion B shown in FIG. is there. In the second embodiment, for example, four grooves 1b extending in the laminating direction are provided on the inner peripheral surface of the rotary shaft insertion hole 4 of the armature core 1, and the outer peripheral surface of the rotary shaft 3 is set to be at least longer than the thickness of the armature core 1. The projection 3a is provided. The protrusion 3a has a height of, for example, 0.04 mm to 0.3 m.
m, and is inserted with a gap from the groove 1b.

The armature core 1 and the rotating shaft 3 are integrated by inserting the projection 3a of the rotating shaft 3 into the groove 1b of the rotating shaft insertion hole 4.
When heat is applied in the pretreatment to the inside, the heat is transmitted to the inside of the armature core 1 through the protrusion 3a, and the protrusion 3a and the groove 1
Also transmitted to the gap between b. Therefore, oil trapped between the electromagnetic steel plates and oil between the rotating shaft 3 inserted into the rotating shaft insertion hole 4 and the armature core 1 are vaporized by heat.

As described above, the groove 1b is provided in the armature core 1 and the projection 3a is provided on the rotating shaft 3 so that the inside of the armature core 1 is also heated.
In addition, since the insulating coating film 12 formed by electrostatic powder coating is free from pinholes and shrinkage, the insulating coating film 12 can be prevented from peeling off.

In the present embodiment, the groove 1b of the armature core 1 and the projection 3a of the rotating shaft 3 are each four, but the number is set in accordance with the size of the armature core 1. Is also good.

Embodiment 3 FIG. 7 is a side view of the armature showing a partial half cross section of the armature core according to Embodiment 3 of the present invention, FIG. 8 is a front view of the armature core, and FIG. 9 is an enlarged view of a portion C shown in FIG. is there. In the third embodiment, a notch portion 3b (knurl) set to be longer than at least the thickness of the armature core 1 is provided on the outer peripheral surface of the rotating shaft 3.

When heat is applied in the pretreatment to the rotating shaft 3 provided with the armature core 1 and the notch 3b, the notch 3b
The heat is also transmitted to the inside of the armature core 1 through the notch, and the oil trapped between the electromagnetic steel sheets and the rotary shaft insertion hole 4
The oil between the rotating shaft 3 inserted into the armature and the armature core 1 is vaporized.

As described above, the notch 3b is provided on the rotary shaft 3 at the portion inserted into the rotary shaft insertion hole 4 of the armature core 1 so that the armature core 1 is also heated from the inside.
The oil removal treatment can be performed sufficiently and promptly, so that there is no pinhole or shrinkage in the insulating coating film 12 formed by electrostatic powder coating, and there is an effect that peeling of the insulating coating film 12 can be prevented.

Embodiment 4 FIG. FIG. 10 shows Embodiment 4 of the present invention.
Side view of the armature showing a partial half-section of the armature core according to
FIG. 11 is a front view of the armature core, and FIG.
FIG. 13 is an enlarged view of a portion E shown in FIG. In the fourth embodiment, an axial groove 3c extending in the axial direction is provided on the outer peripheral surface of the rotating shaft 3. This shaft groove 3
For example, c is substantially the same length as the length of the rotating shaft 3 and is provided at four locations in the circumferential direction.

When heat is applied in the pretreatment to the rotating shaft 3 having the armature core 1 and the shaft groove 3c formed therein, heat is also transmitted to the inside of the armature core 1 through the gap formed by the shaft groove 3c. . Therefore, oil trapped between the electromagnetic steel plates and oil between the rotating shaft 3 inserted into the rotating shaft insertion hole 4 and the armature core 1 are vaporized by heat.

As described above, since the shaft groove 3c is provided in the rotating shaft 3 and the inside of the armature core 1 is also heated from that portion, the oil removing process can be performed sufficiently and quickly. Therefore, the insulating coating film 12 formed by electrostatic powder coating is used.
Thus, there is an effect that pinholes and shrinkage are eliminated, and peeling of the insulating coating film 12 can be prevented.

In this embodiment, four shaft grooves 3c are provided in the circumferential direction of the rotating shaft 3, but the number thereof may be set according to the diameter of the rotating shaft 3. Further, the length of the shaft groove 3c is substantially the same as the length of the rotating shaft 3, but the length is not limited as long as it is longer than the thickness of the armature core 1.

Embodiment 5 FIG. FIG. 14 shows Embodiment 5 of the present invention.
Side view of the armature showing a partial half-section of the armature core according to
FIG. 15 is a front view of the armature core. In the fifth embodiment, a notch 3 d extending in the axial direction set to be longer than at least the thickness of the armature core 1 is provided on the outer peripheral surface of the rotating shaft 3. The notch 3d allows the armature core 1
Is formed between them.

When heat is applied in pretreatment to the rotating shaft 3 provided with the armature core 1 and the notch 3d, the notch 3d
Heat is also transmitted to the inside of the armature core 1 through the gap formed by the above. For this reason, oil trapped between the electromagnetic steel plates and oil between the rotating shaft 3 inserted into the rotating shaft insertion hole 4 and the armature core 1 are vaporized by heat.

As described above, since the notch 3d is provided in the rotary shaft 3 and the inside of the armature core 1 is heated from the gap, the oil removal processing can be performed sufficiently and quickly. The insulation coating film 1 by electrostatic powder coating
2 has an effect that pinholes and shrinkage are eliminated, and peeling of the insulating coating film 12 can be prevented.

Embodiment 6 FIG. FIG. 16 shows Embodiment 6 of the present invention.
Side view of the armature showing a partial half-section of the armature core according to
FIG. 17 is a front view of the armature core, and FIG.
FIG. 19 is an enlarged view of a portion G shown in FIG. In the sixth embodiment, a groove 1c is provided in which the inner peripheral surface of the rotary shaft insertion hole 4 of the armature core 1 is formed in the shape of an internal gear.

When heat is applied to the armature core 1 provided with the gear-shaped groove 1c and the rotating shaft 3 in the pretreatment, heat is also transmitted to the inside of the armature core 1 through the gear-shaped groove 1c.
Oil trapped between the magnetic steel sheets and oil between the rotating shaft 3 inserted into the rotating shaft insertion hole 4 and the armature core 1 are vaporized by heat.

As described above, the inner peripheral surface of the rotary shaft insertion hole 4 of the armature core 1 is provided with the groove portion 1c formed in the shape of an internal gear, so that the inside of the armature core 1 is also heated from the gap. As a result, the oil removal treatment can be performed sufficiently and quickly, so that the insulating coating film 12 formed by electrostatic powder coating does not have pinholes or shrinkage, and the insulating coating film 12 can be prevented from peeling. effective.

Embodiment 7 FIG. FIG. 20 shows Embodiment 7 of the present invention.
Side view of the armature showing a partial half-section of the armature core according to
21 is an enlarged view of an H portion shown in FIG. 20, FIG. 22 is a front view of an armature core, and FIG. 23 is an enlarged view of an I portion shown in FIG. In the seventh embodiment, a sawtooth-shaped shaft groove 3 e extending in the axial direction longer than at least the thickness of the armature core 1 is provided at a plurality of circumferential positions on the outer peripheral surface of the rotating shaft 3.

When heat is applied in the preprocessing to the armature core 1 and the rotating shaft 3 provided with the sawtooth-shaped shaft groove 3e, heat is also transmitted to the inside of the armature core 1 through the sawtooth-shaped shaft groove 3e.
Oil trapped between the magnetic steel sheets and oil between the rotating shaft 3 inserted into the rotating shaft insertion hole 4 and the armature core 1 are vaporized by heat.

As described above, the sawtooth-shaped axial groove portion 3e extending in the axial direction is provided at a plurality of circumferential positions on the outer peripheral surface of the rotary shaft 3, and the inside of the armature core 1 is also heated from the gap. In addition, the oil removal treatment can be performed sufficiently and promptly, so that there is no pinhole or shrinkage in the insulating coating film 12 formed by electrostatic powder coating, and there is an effect that peeling of the insulating coating film 12 can be prevented. .

Embodiment 8 FIG. FIG. 24 shows Embodiment 8 of the present invention.
Side view of the armature showing a partial half-section of the armature core according to
FIG. 25 is a front view of the armature core, and FIG.
It is an enlarged view of a part. In the eighth embodiment, for example, holes 1 extending toward the rotation shaft insertion hole 4 are formed at the bottoms of a pair of slots 2 opposed to each other via the rotation shaft insertion hole 4 of the armature core 1.
d is provided.

When heat is applied to the armature core 1 having the hole 2d at the bottom of the slot 2 and the rotating shaft 3 in the pretreatment, heat is also transmitted to the inside of the armature core 1 through the hole 1d, and Oil trapped in the gap or oil between the rotating shaft 3 inserted into the rotating shaft insertion hole 4 and the armature core 1 is vaporized by heat.

As described above, since the hole 1d is provided at the bottom of the slot 2 of the armature core 1 and the inside of the armature core 1 is also heated from the hole 1d, the oil removing process is sufficiently performed. This can be carried out quickly, so that there is no pinhole or shrinkage in the insulating coating film 12 formed by electrostatic powder coating, and there is an effect that peeling of the insulating coating film 12 can be prevented.

In this embodiment, the holes 1d are provided at the bottoms of the pair of slots 2 facing each other. However, the present invention is not limited to this. A plurality may be provided in the direction.

Embodiment 9 FIG. 27 shows Embodiment 9 of the present invention.
Side view of the armature showing a partial half-section of the armature core according to
FIG. 28 is a front view of the armature core, and FIG.
It is an enlarged side view of a part. In the ninth embodiment, for example, a porous heat-resistant plastic 5 having air permeability is provided between the rotation shaft insertion hole 4 of the armature core 1 and the rotation shaft 3 in the rotation shaft insertion hole 4.

When heat is applied in the pretreatment to the armature core 1 in which the heat-resistant plastic 5 is provided in the rotary shaft insertion hole 4 and the rotary shaft 3, the heat-resistant plastic 5 has good air permeability. Heat is also transmitted to the inside of the motor 1, and the oil trapped between the magnetic steel sheets and the oil between the rotating shaft 3 inserted into the rotating shaft insertion hole 4 and the armature core 1 are vaporized by the heat.

As described above, the porous heat resistant plastic 5 is provided between the armature core 1 and the rotary shaft 3 in the rotary shaft insertion hole 4, and the armature core 1 is separated from the heat resistant plastic 5.
Since the inside of the coating is also heated, the oil removal treatment can be performed sufficiently and promptly, so that there is no pinhole or shrinkage in the insulating coating film 12 formed by electrostatic powder coating. There is an effect that peeling of the film 12 can be prevented.

Embodiment 10 FIG. 30 is a side view of the armature showing a partial half cross section of the armature core according to Embodiment 10 of the present invention, FIG. 31 is a front view of the armature core, FIG. 32 is an enlarged view of an L part shown in FIG. FIG. 33 is an enlarged view of a portion M shown in FIG. In the tenth embodiment, a groove 1e in the laminating direction provided on the inner peripheral surface of the rotation shaft insertion hole 4 of the armature core 1;
And an oil absorbing member 6 inserted into the groove 1e.

The oil trapped between the electromagnetic steel sheets by the oil adsorbing member 6 inserted into the groove 1e of the rotary shaft insertion hole 4,
Oil between the rotating shaft 3 inserted into the rotating shaft insertion hole 4 and the armature core 1 is adsorbed.

As described above, the oil adsorbing member 6 is inserted into the groove 1e in the laminating direction provided in the inner peripheral surface of the rotary shaft insertion hole 4 of the armature core 1 to adsorb the oil. The oil removal by heating can be performed sufficiently and quickly, so that there is no pinhole or shrinkage in the insulating coating film 12 formed by electrostatic powder coating, and the insulating coating film 12 can be prevented from peeling. is there.

Embodiment 11 FIG. 34 is a side view of an armature showing a partial half cross section of an armature core according to an eleventh embodiment of the present invention, FIG. 35 is an enlarged view of an N portion shown in FIG. 34, and FIG. FIG. 37 is a front view of the electromagnetic steel sheet showing the non-processed surface side. In the eleventh embodiment, the armature core 1 is used in which the electromagnetic steel sheets 11 whose one surface is blasted are stacked and caulked in one direction. This blasting is performed on the surface of the electromagnetic steel plate 11 on the side opposite to the burr direction generated on the peripheral surface, and a slight gap 1f is formed between the magnetic steel plates 11 by the blasting (see FIG. 35).

The blasted armature core 1
When heat is applied to the rotating shaft 3 and the pretreatment, the heat is also transmitted to the inside of the armature core 1 through the slight gap 1f between the magnetic steel plates 11, and the oil trapped between the magnetic steel plates and the rotating shaft insertion hole are formed. Oil between the rotating shaft 3 inserted into the armature 4 and the armature core 1 is vaporized by heat.

As described above, since a small gap 1f generated between the laminated steel plates 11 is formed by the blasting so that heat is transmitted to the inside of the armature core 1, the oil removing treatment can be performed sufficiently and quickly. For this reason, the insulating coating film 12 formed by electrostatic powder coating has no effect of pinholes or shrinkage, and has the effect of preventing peeling of the insulating coating film 12.

Embodiment 12 FIG. FIG. 38 is a side view of an armature showing a partial half section of an armature core according to Embodiment 12 of the present invention, FIG. 39 is an enlarged side view of a portion P shown in FIG. 38, and FIG. FIG. 41 is a front view of the electromagnetic steel sheet showing the non-machining side surface. In the twelfth embodiment, the electromagnetic steel sheet 11 having a plurality of grooves 1g radially arranged around the rotation shaft insertion hole 4 in one surface between the slot 2 and the rotation shaft insertion hole 4 is moved in one direction. An armature core 1 laminated and crimped is used.

When heat is applied to the armature core 1 provided with the groove portion 1g and the rotating shaft 3 in the pretreatment, heat is also transmitted to the inside of the armature core 1 through the groove portion 1g and confined between the magnetic steel sheets. Oil or rotary shaft 3 inserted in rotary shaft insertion hole 4
Oil between the armature and the armature core 1 is vaporized by heat.

As described above, since the groove 1g is provided between the electromagnetic steel plates 11 and the inside of the armature core 1 is also heated from the groove 1g, the oil removing treatment can be performed sufficiently and quickly. For this reason, the insulating coating film 12 formed by electrostatic powder coating is free from pinholes and shrinkage.
2 can be prevented from peeling off.

Embodiment 13 FIG. 42 is a side view of the armature showing a partial half cross section of the armature core according to Embodiment 13 of the present invention, FIG. 43 is a front view of the armature core, and FIG. 44 is an enlarged view of a Q portion shown in FIG. is there. In the thirteenth embodiment, a slit 1h is provided in the plane between the slot 2 and the rotary shaft insertion hole 4 of the armature core 1 so as to extend from the bottom of the slot 2 in the central axis direction of the rotary shaft insertion hole 4. . This slit 1
h is formed, for example, such that the width of the front is smaller than the diameter of the winding and extends in the laminating direction of the armature core 1.

When heat is applied to the armature core 1 provided with the slit 1h and the rotating shaft 3 in the pretreatment, the slit 1h
The heat is also transmitted to the inside of the armature core 1 through the armature, and the oil trapped between the magnetic steel sheets and the oil between the rotating shaft 3 inserted into the rotating shaft insertion hole 4 and the armature core 1 are vaporized by the heat. You.

As described above, since the slit 1h is provided at the bottom of the slot 2 of the armature core 1 and the inside of the armature core 1 is also heated from the slit 1h, the oil removing process is sufficiently performed. Can be done quickly, because of this
There is no pinhole or shrinkage in the insulating coating film 12 formed by the electrostatic powder coating, so that there is an effect that peeling of the insulating coating film 12 can be prevented.

Although the present embodiment has described that the slits 1h extending toward the center of the armature core 1 are formed in the stacking direction, a plurality of such slits 1h are provided at equal intervals in the stacking direction. It may be.

Embodiment 14 FIG. FIG. 45 is a side view of the armature showing a partial half cross section of the armature core according to Embodiment 14 of the present invention, FIG. 46 is a front view of the armature core, and FIG. 47 is an enlarged view of the R portion shown in FIG. is there. In the fourteenth embodiment, a slit 1i is provided in the plane between the outer peripheral surface of the armature core 1 and the rotary shaft insertion hole 4 so as to extend from the outer peripheral surface in the central axis direction of the rotary shaft insertion hole 4. The width of the front face of the slit 1i is smaller than the diameter of the winding, similarly to the thirteenth embodiment, and extends in the stacking direction of the armature core 1.

When heat is applied to the armature core 1 provided with the slits 1i as described above and the rotating shaft 3 in the pretreatment, the heat is also transmitted to the inside of the armature core 1 through the slits 1i, so that the magnetic steel sheet Oil or rotary shaft insertion hole 4
Oil between the rotating shaft 3 inserted into the armature and the armature core 1 is vaporized by heat.

As described above, since the above-described slits 1i are provided in the armature core 1 and the inside of the armature core 1 is also heated from the slits 1i, the oil removing process is sufficiently and quickly performed. For this reason, the insulating coating film 12 formed by electrostatic powder coating has no pinholes or shrinkage, and has the effect of preventing peeling of the insulating coating film 12.

In this embodiment, the slits 1i extending toward the center of the armature core 1 are formed in the stacking direction. However, a plurality of such slits 1i are provided at equal intervals in the stacking direction. It may be.

Embodiment 15 FIG. 48 is a side view of the armature showing a partial half cross-section of the armature core according to Embodiment 15 of the present invention, FIG. 49 is an enlarged view of a portion S shown in FIG. 48, and FIG. 50 is a front view of the armature core. is there. In the fifteenth embodiment, the armature core 1 is formed by laminating the electromagnetic steel sheets 11 such that the burrs 7 at the time of punching face each other with a boundary substantially at the center of the thickness in the laminating direction.

When the armature iron core 1 is configured as described above,
Since the burrs 7 do not protrude from the outer peripheral surface and the surface in the slot 2, when the winding is wound in the slot 2, the burrs 7 do not damage the winding.
There is an effect that the thickness of the insulating coating film 12 by the electrostatic powder coating can be reduced.

Embodiment 16 FIG. FIG. 51 is a side view of an armature showing a half cross section of an armature core according to Embodiment 16 of the present invention, FIG. 52 is a front view of the armature core, and FIG. 53 is an enlarged view of a T portion shown in FIG. is there. In the sixteenth embodiment, a concave groove 1j for inserting the wedge 8 is formed in the stacking direction on the opposing surface above the slot 2 of the armature core 1. When the wedge 8 is inserted after winding the coil in the slot 2, the wedge 8 is inserted so as to be inserted into the concave groove portion 1 j, so that the thickness of the insulating coating film 12 varies.
There is an effect that the poor insertion can be improved, and the wedge 8 can be prevented from falling down or coming off in the slot 2.

[0080]

As described above, according to the first aspect of the present invention, since the holes in the laminating direction are provided in the plane between the slot of the armature core and the rotary shaft insertion hole, the electrostatic powder is formed. When heating is performed by the pretreatment of the body painting process, heat is also transmitted to the center of the armature core through the hole, so that the oil removal treatment can be performed sufficiently and quickly, and the electrostatic powder There is an effect that pinholes and shrinkage are eliminated in the insulating coating film by coating, and peeling of the insulating coating film can be prevented.

According to the invention of claim 2 of the present invention, the groove in the stacking direction is provided on the inner peripheral surface of the rotary shaft insertion hole of the armature core,
Since the protrusion provided on the outer peripheral surface of the rotating shaft at least longer than the thickness of the armature core can be inserted into the groove, when heating is performed by the pre-processing of the electrostatic powder coating process, the Heat is also transmitted to the inside of the armature core through the protrusion and the gap between the groove and the protrusion, and therefore,
The oil removal treatment can be performed sufficiently and quickly, and there is an effect that the insulating coating film formed by electrostatic powder coating is free from pinholes and shrinkage, and the insulating coating film can be prevented from peeling.

According to the invention of claim 3 of the present invention, since the step set at least longer than the thickness of the armature core is provided on the outer peripheral surface of the rotating shaft, heating by the pretreatment in the electrostatic powder coating step is not performed. If this is done, heat is also transmitted to the inside of the armature core through the notch, so that the oil removal treatment can be performed sufficiently and quickly, and pinholes or holes are formed on the insulating coating film by electrostatic powder coating. There is an effect that shrinkage is eliminated and peeling of the insulating coating film can be prevented.

According to the fourth aspect of the present invention, since the axial groove portion is provided on the outer peripheral surface of the rotary shaft, when heating is performed by the pretreatment in the electrostatic powder coating step, the shaft groove portion is provided. The heat is also transmitted to the inside of the armature core through the gap between the rotating shaft insertion hole formed by the above, so that the oil removal treatment can be performed sufficiently and quickly, and the insulation by electrostatic powder coating There is an effect that pinholes and shrinkage are eliminated in the coating film, and peeling of the insulating coating film can be prevented.

According to the fifth aspect of the present invention, the notch extending in the axial direction at least longer than the thickness of the armature core is provided on the outer peripheral surface of the rotating shaft, so that the electrostatic powder coating step is performed. When the heating is performed by the pretreatment described above, heat is also transmitted to the inside of the armature core through the gap formed between the notch portion and the rotary shaft insertion hole. It can be performed quickly, and there is an effect that pinholes and shrinkage are eliminated in the insulating coating film formed by electrostatic powder coating, and peeling of the insulating coating film can be prevented.

According to the sixth aspect of the present invention, since the inner peripheral surface of the rotary shaft insertion hole of the armature iron core is provided with a groove formed in the shape of an internal gear, the groove is formed before the electrostatic powder coating step. When the heating by the treatment is performed, the heat is also transmitted to the inside of the armature core through the gap formed between the groove and the rotating shaft, so that the oil removing treatment can be performed sufficiently and quickly. ,
There is an effect that pinholes and shrinkage are eliminated in the insulating coating film formed by electrostatic powder coating, and peeling of the insulating coating film can be prevented.

According to the invention of claim 7 of the present invention, the axial groove portion extending in the axial direction at least longer than the thickness of the armature core is provided at a plurality of circumferential positions on the outer peripheral surface of the rotating shaft. When heating is performed by the pretreatment of the powder coating process, heat is also transmitted to the inside of the armature core through the gap between the rotating shaft insertion hole formed in the shaft groove portion, and therefore,
The oil removal treatment can be performed sufficiently and quickly, and there is an effect that the insulating coating film formed by electrostatic powder coating is free from pinholes and shrinkage, and the insulating coating film can be prevented from peeling.

According to the eighth aspect of the present invention, since the hole extending toward the rotary shaft insertion hole is provided at the bottom of at least one slot of the armature core, heating by pretreatment in the electrostatic powder coating step is performed. When heat is removed, heat is also transmitted to the inside of the armature core through the holes,
In addition, it can be performed quickly, and there is an effect that pinholes and shrinkage are eliminated in the insulating coating film formed by electrostatic powder coating, and peeling of the insulating coating film can be prevented.

According to the ninth aspect of the present invention, a heat-resistant resin having air permeability is provided between the rotation shaft insertion hole of the armature core and the rotation shaft inserted into the rotation shaft insertion hole. When heating is performed by the pre-treatment of the electrostatic powder coating process, heat is also transmitted to the inside of the armature core through the heat-resistant resin, so that the oil removing treatment can be performed sufficiently and quickly, and the static electricity can be removed. There is an effect that pinholes and shrinkage are eliminated in the insulating coating film formed by the powder coating and peeling of the insulating coating film can be prevented.

According to the tenth aspect of the present invention, a groove in the laminating direction is provided on the inner peripheral surface of the rotary shaft insertion hole of the armature core, and the oil adsorbing member is inserted into the groove to adsorb the oil. As a result, oil removal by heating in the pretreatment was sufficiently performed.
In addition, it can be performed quickly, and there is an effect that pinholes and shrinkage are eliminated in the insulating coating film formed by electrostatic powder coating, and peeling of the insulating coating film can be prevented.

According to the eleventh aspect of the present invention, since one surface of the steel plate constituting the armature core is blasted to form a slight gap between the laminated steel plates, the gap between the laminated steel plates is reduced. When heating by pre-processing, heat is also transmitted to the inside of the armature core through the gap, so that the oil removal processing can be performed sufficiently and quickly, and the insulating coating film by electrostatic powder coating This has the effect of eliminating pinholes and shrinkage and preventing peeling of the insulating coating film.

According to the twelfth aspect of the present invention, in one surface between the slot of the steel plate constituting the armature iron core and the rotary shaft insertion hole, radial arrangement is made with the rotary shaft insertion hole as the center. Since a groove is provided, when heating is performed by pre-processing of the electrostatic powder coating process, heat is also transmitted to the inside of the armature core through the groove, and therefore, the oil removal processing is sufficiently performed.
In addition, it can be performed quickly, and there is an effect that pinholes and shrinkage are eliminated in the insulating coating film formed by electrostatic powder coating, and peeling of the insulating coating film can be prevented.

According to the thirteenth aspect of the present invention, the slit is provided in the plane between the slot of the armature iron core and the rotary shaft insertion hole in the direction of the center axis of the rotary shaft insertion hole from the slot bottom. However, when heating is performed in the pretreatment of the electrostatic powder coating process, heat is also transmitted to the inside of the armature core through the slit, so that the oil removing process can be performed sufficiently and quickly, and the static There is an effect that pinholes and shrinkage are eliminated in the insulating coating film formed by the powder coating and peeling of the insulating coating film can be prevented.

According to the fourteenth aspect of the present invention, a slit is provided in the plane between the outer periphery of the armature core and the rotary shaft insertion hole, extending from the outer peripheral surface in the central axis direction of the rotary shaft insertion hole. Therefore, when heating by pre-processing as described above,
Heat is also transmitted to the inside of the armature core through the slits, so that the oil removal treatment can be performed sufficiently and quickly, and there is no pinhole or shrinkage on the insulating coating film formed by electrostatic powder coating. There is an effect that peeling of the coating film can be prevented.

According to the fifteenth aspect of the present invention, the armature iron core is configured such that the steel plates located at least at both ends are arranged so that the burrs at the time of punching face each other, and are caulked. The burrs do not protrude on the outer peripheral surface of the iron core and the surface in the slot, and when the winding is wound in the slot, the burrs do not damage the winding. There is an effect that the thickness of the insulating coating film can be reduced.

According to the sixteenth aspect of the present invention, since the concave portion for inserting the wedge is provided on the opposing surface above the slot of the armature core, it is possible to improve the poor insertion of the wedge due to the variation in the thickness of the insulating coating film. In addition, there is an effect that the wedge can be prevented from falling down or coming off in the slot.

[Brief description of the drawings]

FIG. 1 is a side view of an armature showing a partial half cross section of an armature core according to Embodiment 1 of the present invention.

FIG. 2 is a front view of an armature core.

FIG. 3 is an enlarged view of a portion A shown in FIG.

FIG. 4 is a side view of an armature showing a partial half cross section of an armature core according to a second embodiment of the present invention.

FIG. 5 is a front view of an armature core.

6 is an enlarged view of a portion B shown in FIG.

FIG. 7 is a side view of an armature showing a partial half cross section of an armature core according to Embodiment 3 of the present invention.

FIG. 8 is a front view of an armature core.

FIG. 9 is an enlarged view of a portion C shown in FIG. 7;

FIG. 10 is a side view of an armature showing a partial half cross section of an armature core according to Embodiment 4 of the present invention.

FIG. 11 is a front view of an armature core.

FIG. 12 is an enlarged view of a portion D shown in FIG.

FIG. 13 is an enlarged view of a portion E shown in FIG.

FIG. 14 is a side view of an armature showing a partial half cross section of an armature core according to Embodiment 5 of the present invention.

FIG. 15 is a front view of an armature core.

FIG. 16 is a side view of an armature showing a partial half cross section of an armature core according to Embodiment 6 of the present invention.

FIG. 17 is a front view of an armature core.

18 is an enlarged view of a portion F shown in FIG.

19 is an enlarged view of a portion G shown in FIG.

FIG. 20 is a side view of an armature showing a partial half cross section of an armature core according to Embodiment 7 of the present invention.

21 is an enlarged view of a portion H shown in FIG.

FIG. 22 is a front view of an armature core.

FIG. 23 is an enlarged view of a portion I shown in FIG.

FIG. 24 is a side view of an armature showing a partial half cross section of an armature core according to Embodiment 8 of the present invention.

FIG. 25 is a front view of an armature iron core.

26 is an enlarged view of a portion J shown in FIG. 24.

FIG. 27 is a side view of an armature showing a partial half cross section of an armature core according to Embodiment 9 of the present invention.

FIG. 28 is a front view of an armature core.

29 is an enlarged view of a portion K shown in FIG. 27.

FIG. 30 is a side view of an armature showing a partial half cross section of an armature core according to Embodiment 10 of the present invention.

FIG. 31 is a front view of an armature core.

FIG. 32 is an enlarged view of a portion L shown in FIG.

FIG. 33 is an enlarged view of a portion M shown in FIG. 31.

FIG. 34 is a side view of an armature showing a partial half cross section of an armature core according to Embodiment 11 of the present invention.

FIG. 35 is an enlarged view of a portion N shown in FIG. 34;

FIG. 36 is a front view of the electromagnetic steel sheet showing the blasting surface side.

FIG. 37 is a front view of the electromagnetic steel sheet showing the non-processed surface side.

FIG. 38 is a side view of the armature showing a partial half cross section of the armature core according to Embodiment 12 of the present invention.

FIG. 39 is an enlarged view of a portion P shown in FIG. 38;

FIG. 40 is a front view of the electromagnetic steel sheet showing a processing-side surface.

FIG. 41 is a front view of the electromagnetic steel sheet showing the non-machining side surface.

FIG. 42 is a side view of an armature showing a partial half cross section of an armature core according to Embodiment 13 of the present invention.

FIG. 43 is a front view of an armature iron core.

FIG. 44 is an enlarged view of a portion Q shown in FIG. 43.

FIG. 45 is a side view of an armature showing a partial half cross section of an armature core according to Embodiment 14 of the present invention.

FIG. 46 is a front view of the armature iron core.

FIG. 47 is an enlarged view of an R portion shown in FIG. 46.

FIG. 48 is a side view of an armature showing a partial half cross section of an armature core according to Embodiment 15 of the present invention.

FIG. 49 is an enlarged view of a portion S shown in FIG. 48.

FIG. 50 is a front view of an armature core.

FIG. 51 is a side view of an armature showing a partial half cross section of an armature core according to Embodiment 16 of the present invention.

FIG. 52 is a front view of an armature core.

FIG. 53 is an enlarged view of a portion T shown in FIG. 52.

FIG. 54 is a side view of the armature showing a partial half section of the armature core.

FIG. 55 is a front view of the armature iron core.

FIG. 56 is an enlarged view of a U portion shown in FIG. 54.

FIG. 57 is an enlarged view of a portion V shown in FIG. 55.

FIG. 58 is a view schematically showing a system for electrostatic powder coating.

FIG. 59 is a flowchart showing a method of electrostatic powder coating.

[Explanation of symbols]

1 Armature core, 2 slots, 3 rotating shafts, 4 rotating shaft insertion holes.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shuichi Odaka 1728-1, Koeda, Oaza-gun, Hanazono-cho, Osato-gun, Saitama Prefecture Inside Mitsubishi Electric Home Equipment Co., Ltd. Mitsubishi Electric Home Equipment Co., Ltd. F-term (reference) 5H002 AA07 AB08 AC01 AE08

Claims (16)

[Claims] 1. An armature for an electric motor, wherein a hole in a stacking direction is provided in a plane between a slot of an armature core and a rotary shaft insertion hole. 2. A laminating direction groove portion provided on an inner peripheral surface of a rotation shaft insertion hole of an armature core, and provided on an outer peripheral surface of the rotation shaft so as to be longer than at least the thickness of the armature core. An armature for an electric motor, comprising: a projection that is guided with a gap in the groove when the rotation shaft is inserted into the insertion hole. 3. An armature for a motor, wherein a step set at least longer than the thickness of an armature core is provided on an outer peripheral surface of a rotating shaft. 4. An armature for an electric motor, wherein an axial groove is provided on an outer peripheral surface of a rotating shaft. 5. An armature for an electric motor, wherein a notch extending in an axial direction longer than at least a thickness of an armature core is provided on an outer peripheral surface of a rotating shaft. 6. An armature for an electric motor, wherein a groove is formed in which an inner peripheral surface of a rotary shaft insertion hole of an armature core is formed in a gear shape of internal teeth. 7. An armature for an electric motor, wherein shaft grooves extending in an axial direction longer than at least a thickness of an armature core are provided at a plurality of circumferential positions on an outer peripheral surface of a rotating shaft. 8. An armature for an electric motor, wherein a hole extending toward the rotary shaft insertion hole is provided at the bottom of at least one slot of the armature core. 9. An armature for an electric motor, wherein a heat-resistant resin having air permeability is provided between a rotation shaft insertion hole of an armature core and a rotation shaft inserted into the rotation shaft insertion hole. 10. An armature for an electric motor, comprising: a groove in the stacking direction provided on an inner peripheral surface of a rotary shaft insertion hole of an armature core; and an oil absorbing member inserted into the groove. 11. An armature for an electric motor, wherein one surface of a steel plate laminated to form an armature iron core has a blast shape. 12. A groove radially arranged around the rotation shaft insertion hole is provided in one surface between the slot of the steel plate and the rotation shaft insertion hole which are laminated to form an armature iron core. And the armature of the motor. 13. An armature for an electric motor, wherein a slit extending from the bottom of the slot in the plane between the slot of the armature core and the rotary shaft insertion hole in the central axis direction of the rotary shaft insertion hole is provided. 14. An armature for an electric motor, wherein a slit is provided in a plane between the outer periphery of the armature core and the rotation shaft insertion hole, the slit extending from the outer periphery in the direction of the center axis of the rotation shaft insertion hole. 15. The armature iron core according to claim 1, wherein steel plates located at least at both ends are arranged and caulked so that burr directions at the time of punching face each other. Motor armature. 16. An armature for an electric motor according to claim 1, wherein a concave portion for inserting a wedge is provided on a facing surface above the slot of the armature core.