JP2020156153A - Rotator of rotary electric machine and rotator manufacturing method - Google Patents

Abstract

To provide a rotator of a rotary electric machine in which high reliability is obtained and deterioration of efficiency can be inhibited, and a manufacturing method for manufacturing the rotator with ease at a low cost.SOLUTION: A rotator 1 of a rotary electric machine according to an embodiment is formed by providing a conductor 5 which is a conductive material in a slot 3 of a rotator core 2. On an inner surface of the slot 3, an insulating coat 4 which is made of Tyranno varnish formed by baking and drying is provided.SELECTED DRAWING: Figure 1

Description

An embodiment of the present invention relates to a rotor of a rotary electric machine and a method for manufacturing the rotor.

Conventionally, a rotor of a rotary electric motor such as a so-called squirrel-cage induction motor is formed by die-casting or molten metal forging a conductive material such as aluminum or copper in a slot of a rotor core in which iron core pieces are laminated. At this time, if the conductive material and the rotor core are short-circuited, a leakage current will flow and the efficiency of the rotary electric machine will decrease. Therefore, the slot of the rotor core is subjected to an insulating treatment such as forming an insulating film on the inner surface thereof (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2003-18807

However, the conventional insulating coating is formed by treating an iron oxide-based powdery insulating material. In this case, alkaline corrosive gas is generated during the formation of the insulating film, which may corrode peripheral devices. Further, since the insulating film is finally in a state close to powder, the adhesiveness is not good. In addition, there were cases where the conductor could not be separated from the slot to insulate due to heat shock after die casting, and the efficiency could not be improved. Further, the powdery insulating material adheres to a part other than the slot, that is, a part necessary for improving the efficiency of the rotary electric machine, and therefore needs to be removed by post-treatment. This has led to an increase in the amount of drug used and an increase in labor.
Therefore, we provide a rotor of a rotating electric machine that is highly reliable and can suppress a decrease in efficiency, and a manufacturing method that can easily and inexpensively manufacture the rotor.

The rotor of the rotary electric machine of the embodiment is formed by providing a conductive material in the slot of the rotor core, and an insulating film made of Tyranovanis formed by baking and drying is provided on the inner surface of the slot. It is characterized by being.

Further, the method for manufacturing a rotor of a rotary electric machine according to the embodiment includes a step of removing oil adhering to the rotor core, a step of filling a slot with an immersion liquid for forming an insulating film, and a filling immersion. In the step of forming the insulating film, which includes a step of removing the liquid by its own weight, a step of pre-drying the rotor core, and a step of forming an insulating film by baking drying, the insulating film composed of iron core annealing and Tyranovanis It is characterized in that the formation is performed at the same time.

The figure which shows a part of the rotor of an embodiment schematically. The figure which shows the flow of the manufacturing process of a rotor The figure which shows the structure of the rotor core schematically The figure which shows typically the state which attached the jig The figure which shows typically the state which looked at the upper end side jig from the arrow V direction of FIG. FIG. 5 is a diagram schematically showing a cross section taken along line VI-VI of FIG. The figure which shows typically the mode of filling a treatment liquid. The figure which shows typically the mode of baking and drying a rotor core.

Hereinafter, embodiments will be described with reference to the drawings.
As shown in FIG. 1, in the rotor 1 of the present embodiment, an insulating coating 4 is formed on the inner surface of the slot 3 of the rotor core 2, and the conductor 5 is placed in the slot 3 with the insulating coating 4 interposed therebetween. It is provided. The rotor core 2 is formed by laminating a plurality of iron core pieces 6 (see FIG. 3). The conductor 5 is formed by casting a conductive material such as aluminum or copper into the slot 3 by die casting. A conductive alloy material can also be used as the conductor 5. Further, the conductor 5 can be provided by molten metal forging instead of die casting.

The insulating coating 4 is made of Tyranovanis, which will be described in detail later. ing. The insulating coating 4 has a thickness of about several μm and is uniformly formed on the inner surface of the slot 3.

Next, a method for manufacturing the rotor 1 having the above-described configuration will be described mainly together with a step of forming the insulating coating 4.
As mentioned above, the conventional ones may generate alkaline corrosive gas to corrode surrounding equipment, have poor adhesion, cannot improve efficiency, and use a large amount. It caused an increase and troublesome work. Therefore, in the present embodiment, the rotor 1 is manufactured as follows, which is highly reliable, can suppress a decrease in efficiency, and can be easily and inexpensively manufactured.

First, in the pre-process shown in FIG. 2, an iron core piece 6 is manufactured by punching a thin plate-shaped electromagnetic steel plate with a press machine to form a slot 3 and a hole into which a rotating shaft member (not shown) is inserted. Then, the rotor core 2 is formed by laminating a predetermined number of the iron core pieces 6 in a state where the positions of the slots 3 are aligned (S1).

At this time, as shown in FIG. 3, the iron core pieces 6 are laminated in such a manner that the core metal jig 8 used at the time of die casting in the next step is inserted into the hole. As a result, a plurality of iron core pieces 6 can be laminated in a state where their center positions are matched. In addition, the laminating work at the time of die casting, which is the next process, can be omitted, and the productivity can be improved.

Subsequently, as shown in FIG. 4, both end surfaces of the rotor core 2 in the axial direction, more specifically, an upper end surface on the upper side in the drawing and a lower end surface on the lower side in the drawing, respectively, on the upper end side jig. 9 and the lower end side jig 10 are attached (S2).

The upper end side jig 9 and the lower end side jig 10 are fastened to each other by a fastening jig (not shown) to pressurize the rotor core 2 in the axial direction. As a result, it is possible to prevent the treatment liquid 7 from entering the gap between the iron core pieces 6. It is also possible to place the lower end side jig 10 on the workbench and press the lower end side jig 10 from above to pressurize.

By the way, the rotor core 2 is provided with a plurality of slots 3, and the slots 3 penetrate the rotor core 2 in the axial direction. Therefore, it is generally difficult or very time-consuming to uniformly apply the treatment liquid 7 to the inner surface of such a slot 3. Therefore, in the present embodiment, the structure of the jig is devised so that the treatment liquid 7 can be easily applied to the inner surface of the slot 3.

Specifically, as shown in FIG. 5, the upper end side jig 9 is formed in a circular shape that substantially covers the upper end surface of the rotor core 2, and at one or more positions corresponding to the slots 3. In this embodiment, four openings 9a are formed. Further, the upper end side jig 9 has an inner peripheral portion 9b in which an opening for passing the core metal jig 8 is formed in the center and an outer peripheral portion formed in a substantially annular shape along the outer circumference of the rotor core 2. The portion 9c has a structure connected by a bridge portion 9d.

As shown in FIG. 6, the lower end of the inner peripheral portion 9b is in contact with the upper end surface of the rotor core 2 on the inner peripheral side of the slot 3. At this time, the lower end of the inner peripheral portion 9b is in contact with the upper end surface of the rotor core 2 in the entire circumferential direction of the rotor core 2. Note that in FIG. 6, hatching is omitted in order to make the drawing easier to see.

Further, the lower end of the outer peripheral portion 9c is in contact with the upper end surface of the rotor core 2 on the outer peripheral side of the slot 3. At this time, the lower end of the outer peripheral portion 9c is in contact with the upper end surface of the rotor core 2 in the entire circumferential direction of the rotor core 2.

The bridge portion 9d connects the inner peripheral portion 9b and the outer peripheral portion 9c in a state of being separated from the upper end surface of the rotor core 2. Therefore, a space (S) is formed below the bridge portion 9d between the bridge portion 9d and the upper end surface of the rotor core 2.

Therefore, even when the upper end side jig 9 is attached to the upper end surface of the rotor core 2, there is a gap between the inner peripheral portion 9b and the outer peripheral portion 9c that is approximately the same as the radial direction of the slot 3. However, the rotor core 2 is formed in the entire circumferential direction. That is, each slot 3 is in a state in which the upper end side thereof is open. Further, each slot 3 is in a state in which the inner peripheral side and the outer peripheral side, that is, both end sides in the radial direction are sealed by the inner peripheral portion 9b and the outer peripheral portion 9c pressed against the upper end surface. ..

On the other hand, the lower end side jig 10 is formed in a substantially columnar shape, and as shown in FIG. 4, a recess 10a into which the core metal jig 8 is inserted is formed in the central portion thereof. The outer peripheral side of the recess 10a is in contact with the lower end surface of the rotor core 2. That is, the lower end side of each slot 3 is in a state of being covered by the lower end side jig 10.

Therefore, if the treatment liquid 7 is supplied from the opening 9a, the treatment liquid 7 is filled inside the nearest slot 3 and spreads in the circumferential direction, and the spread treatment liquid 7 spreads to the other slots 3. Is also filled. That is, even if each slot 3 is not individually filled with the treatment liquid 7, and the spout of the treatment liquid 7 is not moved, the treatment liquid 7 is opened through one opening 9a. The treatment liquid 7 can be filled in all the slots 3 simply by pouring. As a result, the work of filling the treatment liquid 7 can be greatly simplified.

Further, if the slot 3 is filled with the treatment liquid 7, the inner surface of the slot 3 comes into contact with the treatment liquid 7 from the lower end to the upper end thereof. As a result, the treatment liquid 7 can be evenly applied to the inner surface of the slot 3. Even if the treatment liquid 7 slightly overflows to the upper end surface side, the inner peripheral side and the outer peripheral side of the slot 3 are sealed by the inner peripheral portion 9b and the outer peripheral portion 9c, so that the treatment liquid is placed in an unintended portion. 7 is prevented from adhering.

Subsequently, the oil adhering to the inner surfaces of the rotor core 2 and the slot 3 to which the jig is attached is removed (S3). This oil adheres, for example, during press working. In addition to removing the oil, dust and the like adhering to the rotor core 2 are also removed. That is, in the step of removing the oil, the rotor core 2 and the jig are cleaned.

Then, the slot 3 of the cleaned rotor core 2 is filled with the treatment liquid 7 for forming the insulating film 4 (S4). This treatment liquid 7 is a solution obtained by diluting a titanium ceramic resin-based paint (for example, Tyrannocoat TYR-1181 manufactured by Okitsumo Co., Ltd.) with No100 thinner or No100B thinner at a dilution ratio of about 50% to 75%. That is, iron, manganese, and cobalt composite oxides are used as the tyranowanis constituting the insulating coating 4. Further, in order to form the insulating coating 4 with a thickness of about several μm, the dilution ratio is set higher than that of a general usage mode.

As shown in FIG. 7, the treatment liquid 7 is stored in the tank 12 in a state of being constantly stirred by the stirrer 11. Then, the processing liquid 7 is assembled by the pump 13 and supplied to the rotor core 2 to fill each slot 3. At this time, since both ends of the slot 3 in the radial direction are sealed by a jig, the treatment liquid 7 is basically filled only in the slot 3, and the amount of the treatment liquid 7 used is the minimum required. It can be suppressed to the limit.

Although the processing liquid 7 can be filled in each slot 3 by supplying from one opening 9a as described above, the rotor core 2 is supplied while being rotated as a whole. , The efficiency of filling work can be improved. In that case, by using a so-called dispenser instead of the pump 13, filling can be performed while synchronizing the rotation and the supply.

Subsequently, the excess treatment liquid 7 filled in the slot 3 is removed (S5). At this time, the surplus processing liquid 7 in the slot 3 is discharged into the tank 12 by its own weight by tilting the rotor core 2 with the jig attached as a whole. Therefore, unlike the case where the surplus is sucked up by the apparatus, for example, the treatment liquid 7 adhering to the inner surface of the slot 3 is prevented from being excessively removed. Further, since the surplus treatment liquid 7 is used for the next filling, the amount of the treatment liquid 7 used can be suppressed. By masking the outer peripheral surface of the rotor core 2 with a vinyl material or the like when the rotor core 2 is cleaned, the treatment liquid 7 is applied to the outer peripheral surface of the rotor core 2 when the treatment liquid 7 is discharged. Can be prevented from adhering.

After that, the jig is removed and the rotor core 2 is pre-dried (S6). At this time, as the heat source for pre-drying, the heat energy obtained by burning an organic solvent such as thinner contained in the treatment liquid 7 is used. As a result, pre-drying can be performed while reducing energy consumption as compared with the case of using another heat source.

As shown in FIG. 8, a plurality of rotor cores 2 for which pre-drying has been completed are placed in the drying furnace 14, and the main drying is performed at a temperature of 380 ° C. or higher. As a result, the rotor core 2 is annealed. Hereinafter, annealing of the rotor core 2 will be referred to as iron core annealing.

Further, by performing the main drying at a temperature of 380 ° C. or higher, the treatment liquid 7 adhering to the inner surface of the slot 3 is baked and dried, and the insulating film 4 is formed on the inner surface of the slot 3. That is, in the present embodiment, the iron core annealing and the formation of the insulating coating 4 are performed at the same time. Since the insulating film 4 can be formed by baking and drying in this way, the work efficiency can be greatly improved as compared with the case where each is performed in a separate process.

In the rotor core 2 for which the main drying has been completed, a conductive material such as aluminum or copper is cast in the slot 3 by die casting to provide the conductor 5 in the post-process. As a result, the rotor 1 is manufactured.

According to the manufacturing method described above and the rotor 1 manufactured by the manufacturing method, the following effects can be obtained.
The rotor 1 is provided with an insulating coating 4 made of Tyranovanis formed by baking and drying on the inner surface of the slot 3. The insulating coating 4 made of Tyranovanis prevents the conductor 5 from coming into contact with the rotor core 2, and can reduce the leakage current.

At this time, since the insulating coating 4 made of Tyranovanis does not adhere to the molten aluminum, for example, the fluidity of the molten aluminum during die casting is not hindered, and the moldability can be improved. Further, since the conductor 5 and the insulating coating 4 are easily peeled off by the heat shock after die casting, the insulating property can be further improved. Further, the insulating coating 4 made of Tyranovanis can be formed with a thickness required only on the inner surface of the slot 3, so that the amount of the treatment liquid 7 used can be reduced and the cost can be reduced.
Therefore, it is possible to manufacture the rotor 1 of a rotary electric machine which is highly reliable and can suppress a decrease in efficiency.

Further, the insulating coating 4 is formed by baking and drying at 380 ° C. or higher. As a result, the iron core of the rotor core 2 can be annealed and the insulating coating 4 can be formed at the same time, and the work efficiency can be greatly improved.
Iron, manganese, and cobalt composite oxides are used as the tyranowanis constituting the insulating coating 4. As a result, high heat resistance and high insulation can be ensured.

Further, the treatment liquid 7 for forming the insulating film 4 has a higher dilution rate than the general usage form. As a result, the insulating coating 4 is formed with a thickness of about several μm, and the insulating coating 4 can be made hard to crack.

Further, in the method for manufacturing the rotor 1, a step of filling the slot 3 with a treatment liquid 7 for forming an insulating coating 4 made of Tyranovanis on the inner surface of the slot 3 and a step of removing excess treatment liquid 7 from the slot 3. A step of pre-drying the rotor core 2 from which the excess treatment liquid 7 has been removed, and a step of forming an insulating coating 4 on the inner surface of the slot 3 by baking drying are included, and the iron core is annealed and the insulating coating 4 is formed. Is being formed at the same time.

The rotor 1 manufactured by such a manufacturing method has high reliability and can suppress a decrease in efficiency as described above, and such a rotor 1 can be manufactured easily and inexpensively.

Further, in the pre-drying step, the heat energy obtained by burning the organic solvent contained in the treatment liquid 7 is used as the heat source for the pre-drying. As a result, energy consumption can be reduced as compared with the case of using another heat source.

Further, in the step of filling the treatment liquid 7, the treatment liquid 7 is filled while pressurizing the rotor core 2 in the stacking direction. As a result, the treatment liquid 7 is prevented from entering the gap between the iron core pieces 6, and the amount of the treatment liquid 7 used can be reduced.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

In the drawings, 1 is a rotor, 2 is a rotor core, 3 is a slot, 4 is an insulating coating, 5 is a conductor (conductive material), and 7 is a treatment liquid.

Claims (5)

Rotor A rotor of a rotating electric machine formed by providing a conductive material in the slot of the iron core.
A rotor of a rotating electric machine, characterized in that an insulating film made of Tyranovanis formed by baking and drying is provided on the inner surface of the slot. The rotor of a rotary electric machine according to claim 1, wherein the insulating coating is formed by baking and drying at 380 ° C. or higher. The rotor of a rotary electric machine according to claim 1 or 2, wherein an iron, manganese, or cobalt composite oxide is used as the tyranowanis constituting the insulating film. A method for manufacturing a rotor of a rotating electric machine, which is formed by providing a conductive material in a slot of a rotor core.
A step of filling the slot with a treatment liquid for forming an insulating film made of Tyranovanis on the inner surface of the slot.
The step of removing the excess treatment liquid from the slot and
A step of pre-drying the rotor core from which the excess treatment liquid has been removed, and
Including the step of forming the insulating film on the inner surface of the slot by baking and drying.
A method for producing a rotor, which comprises simultaneously annealing an iron core and forming the insulating coating in a step of forming an insulating coating. The method for producing a rotor according to claim 4, wherein in the pre-drying step, the heat energy obtained by burning the organic solvent contained in the treatment liquid is used as the heat source for the pre-drying.

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