CN115516744A - Cage rotor manufacturing method and cage rotor - Google Patents
Cage rotor manufacturing method and cage rotor Download PDFInfo
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- CN115516744A CN115516744A CN202080100435.7A CN202080100435A CN115516744A CN 115516744 A CN115516744 A CN 115516744A CN 202080100435 A CN202080100435 A CN 202080100435A CN 115516744 A CN115516744 A CN 115516744A
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- insulating layer
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- insulating
- cage rotor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K17/00—Asynchronous induction motors; Asynchronous induction generators
- H02K17/02—Asynchronous induction motors
- H02K17/16—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors
Abstract
A rotor (3) manufactured by a cage rotor manufacturing method comprises: a rotor core (9) which is a laminated body of a plurality of steel plates (9 a); and conductors (11) that are respectively housed in a plurality of slots (10) that are arranged in the rotor core (9) in the circumferential direction of a circle that is centered on the rotation axis. The cage rotor manufacturing method comprises a step of applying an insulating coating material to the inner peripheral surfaces of slots (10) included in a plurality of slots (10) to form insulating layers (13) in the slots (10). The insulating coating material contains at least one silicone resin among silicone resins having methylphenyl groups and silicone resins modified by alkyd resins, aggregated particles of inorganic compound particles having a property of primary particle self-aggregation, and a diluting solvent.
Description
Technical Field
The present invention relates to a method for manufacturing a cage rotor of an induction motor and the cage rotor.
Background
Induction motors are most used in motors because of their advantages of being robust and being able to start by being directly connected to a power supply. A cage rotor for use in an induction motor has conductors received in each of a plurality of slots in the rotor core and 2 shorting rings connected to each conductor. In a cage rotor, if insulation between a conductor and a rotor core is insufficient, a current flowing from one conductor to another conductor through the rotor core, that is, a cross current, may occur. Since the cross current is a current component that does not contribute to the driving of the induction motor, the induction motor generates the cross current, thereby reducing the driving efficiency. In order to drive an induction motor with high efficiency, it is desirable to electrically insulate the conductor from the rotor core.
Patent document 1: japanese unexamined patent publication No. 60-121946
Disclosure of Invention
In the method according to the prior art disclosed in patent document 1, it is necessary to perform the coating step 2 times as in the case of applying the inorganic insulating treatment liquid and the inorganic aggregating agent. According to the conventional method, the cage rotor requires 2 coating processes in manufacturing the cage rotor, thereby causing a problem that it is difficult to improve the production efficiency of the cage rotor.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a method for manufacturing a cage rotor, which can improve the productivity of the cage rotor.
In order to solve the above problems and achieve the object, the present invention provides a method of manufacturing a cage rotor, the cage rotor including: a rotor core that is a laminated body of a plurality of steel plates; and
and conductors respectively accommodated in a plurality of slots arranged in a circumferential direction of a circle centered on the rotation axis in the rotor core. The method for manufacturing a cage rotor according to the present invention includes a step of applying an insulating coating material to an inner circumferential surface of a slot included in a plurality of slots to form an insulating layer in the slot. The insulating coating material contains at least one silicone resin among silicone resins having methylphenyl groups and silicone resins modified by alkyd resins, aggregated particles of inorganic compound particles having a property of primary particle self-aggregation, and a diluting solvent.
ADVANTAGEOUS EFFECTS OF INVENTION
The cage rotor manufacturing method has the effect of improving the production efficiency of the cage rotor.
Drawings
Fig. 1 is a diagram illustrating an induction motor according to embodiment 1.
Fig. 2 is a perspective view showing a rotor core included in an induction motor according to embodiment 1.
Fig. 3 is a plan view showing a part of the rotor core shown in fig. 2.
Fig. 4 is a diagram showing conductors provided in the rotor core shown in fig. 2.
Fig. 5 is a schematic view of aggregated particles used in the manufacture of the rotor core shown in fig. 2.
Fig. 6 is a plan view of a slot provided in the rotor core shown in fig. 2.
Fig. 7 is a sectional view showing a portion of the rotor core shown in fig. 2 in which 1 slot is provided.
Fig. 8 is a perspective view showing a part of a rotor core included in an induction motor according to embodiment 2.
Fig. 9 is a plan view showing a part of a rotor core included in an induction motor according to embodiment 3.
Fig. 10 is a perspective view showing a part of a rotor core of an induction motor according to embodiment 4.
Fig. 11 is a perspective view showing a rotor core included in an induction motor according to embodiment 5.
Fig. 12 is a flowchart showing the procedure of the cage rotor manufacturing method according to embodiment 6.
Fig. 13 is a diagram for explaining effects obtained by the cage rotor manufacturing method according to embodiment 6.
Detailed Description
Hereinafter, a cage rotor manufacturing method and a cage rotor according to an embodiment will be described in detail with reference to the drawings.
Fig. 1 is a diagram showing an induction motor according to embodiment 1. An induction motor 1 according to embodiment 1 includes: a cylindrical stator 2; a rotor 3 that is surrounded by the stator 2 and rotationally driven; and a shaft 4 provided at the center of the rotor 3. The rotor 3 is a cage rotor. The rotation axis AX is a rotation center of the rotor 3. In fig. 1, a longitudinal section of the induction motor 1 is shown on the right side of the rotation axis AX. In addition, a side surface of the induction motor 1 is shown on the left side of the rotation axis AX. In the following description, the direction of the rotation axis AX is sometimes referred to as an axial direction.
A housing 5 which is a casing of the induction motor 1 includes a cylindrical frame 6 and an end plate 7. The frame 6 includes a bottom portion 6a of one end in the axial direction among the frames 6. The other end in the axial direction among the frames 6 is open. The end plate 7 is provided at the open end of the frame 6. The stator 2 is embedded inside the frame 6. The shaft 4 penetrates the housing 5. The shaft 4 transmits the rotational force of the rotor 3 to the outside of the induction motor 1.
The induction motor 1 has 2 bearings 8 rotatably supporting the shaft 4. The 1 bearing 8 is provided at the bottom 6a of the frame 6. Another 1 bearing 8 is provided in the end plate 7.
The rotor 3 has a rotor core 9, which is a laminated body of a plurality of steel plates. The rotor core 9 is provided with a plurality of slots 10 arranged in a circumferential direction of a circle centered on the rotation axis AX. A conductor 11 is accommodated in each of the plurality of slots 10. The material of the conductor 11 is a metal material having electrical conductivity, such as aluminum. The rotor 3 has 2 short-circuiting rings 12. The 1 short ring 12 is provided at one end in the axial direction among the rotor cores 9. The other 1 short-circuiting ring 12 is provided at the other end in the axial direction among the rotor cores 9. Each short ring 12 is connected to each of the plurality of conductors 11. The material of each short ring 12 is the same as that of the conductor 11, and is, for example, aluminum.
Fig. 2 is a perspective view showing a rotor core included in an induction motor according to embodiment 1. The steel plate 9a constituting the rotor core 9 is an annular thin plate as a magnet. The plurality of steel plates 9a are stacked in the axial direction. The plurality of steel plates 9a are each fixed to each other by caulking, welding, or adhesion. Each of the plurality of steel plates 9a may not be fixed to each other.
The plurality of slots 10 are arranged at equal intervals in the circumferential direction. An insulating layer 13 is provided on the inner circumferential surface of each slot 10. The insulating layer 13 is provided only on the inner peripheral surface of each slot 10 in the rotor core 9. Each conductor 11 is formed by casting aluminum into the slot 10 provided with the insulating layer 13.
Fig. 3 is a plan view illustrating a part of the rotor core shown in fig. 2. Fig. 3 shows an upper surface of a portion of the rotor core 9 in which 1 slot 10 is provided. The shape of the slit 10 in the cross section shown in fig. 3 is a shape in which the width in the circumferential direction increases as the distance from the rotation axis AX increases. The insulating layer 13 is provided on the entire inner peripheral surface of the slot 10. The insulating layer 13 entirely surrounds the periphery of the conductor 11.
Fig. 4 is a diagram showing conductors provided in the rotor core shown in fig. 2. Fig. 4 shows a part of the rotor core 9. The conductor 11 provided inside the rotor core 9 is shown by a broken line.
Holes constituting the slots 10 are formed in each of the plurality of steel plates 9a constituting the rotor core 9. The plurality of steel plates 9a have the same shape. The plurality of steel plates 9a are stacked by displacing the shape by a predetermined length in the circumferential direction for each 1 of the plurality of steel plates 9a, and the plurality of slits 10 are each inclined with respect to the rotation axis AX. That is, each of the plurality of slits 10 is twisted in the circumferential direction from a state parallel to the rotation axis AX.
Next, a material of the insulating layer 13 will be explained. The insulating layer 13 is formed by applying an insulating paint to the inner circumferential surfaces of the plurality of slots 10, and drying and heating the applied insulating paint.
The insulating coating material contains at least one silicone resin selected from a silicone resin having a methylphenyl group and a silicone resin modified with an alkyd resin. The insulating coating material contains aggregated particles of inorganic compound particles and a diluting solvent. The inorganic compound particles are primary particles having a specific surface area of 0.5m 2 G to 20m 2 Particles of an inorganic compound in the range of/g. The applied insulating paint is dried by leaving the rotor core 9 coated with the insulating paint in the atmosphere. The heating of the insulating coating is performed in a preliminary drying furnace.
The silicone resin having a methylphenyl group is obtained by introducing a methylphenyl group into a silicone resin having a linear structure. Specifically, the silicone resin having a methylphenyl group is obtained by introducing a phenyl group (C) into a side chain of a part of polysiloxanes contained in the silicone resin 6 H 5 ) And then the product is obtained. Chemical formula (1) shown below shows an example of the chemical structure of a silicone resin having a methylphenyl group.
[ CHEM 1 ]
The introduction of the methylphenyl group improves the heat resistance of the silicone resin. Since the silicone resin having a methylphenyl group is contained in the insulating coating material, the insulating coating material is not decomposed or carbonized at a temperature of about 250 degrees, and the mechanical strength of the insulating coating material during drying and heating can be improved. In the aluminum die casting process for forming the conductor 11, the insulating paint is at a temperature of about 700 degrees for about 10 seconds, for example. The silicone resin having a methylphenyl group is contained in the insulating coating material, whereby the insulating coating material can secure short-term heat resistance required in the aluminum die casting process.
The numbers "m" and "n" of the repeating units in chemical formula (1) are arbitrary numbers. The silicone resin having a methylphenyl group is preferably a polymer of at least a trimer, from the viewpoints of the viscosity of the insulating coating material, the strength of the insulating coating material, and the heat resistance of the insulating coating material. In addition, the molecular weight of the silicone resin having methylphenyl groups is preferably greater than or equal to 1000.
The silicone resin modified with the alkyd resin is obtained by a reaction of an oligomer as the silicone resin with the alkyd resin, or a reaction of a polymer as the silicone resin with the alkyd resin. Alkyd resins are high molecular esters obtained by the polycondensation reaction of a polybasic acid and a polyhydric alcohol. Chemical formula (2) shown below represents an example of the chemical structure of the alkyd resin.
[ CHEM 2 ]
The silicone resin modified with the alkyd resin has the characteristics of alkyd, i.e., softness and quick-drying. The silicone resin modified with the alkyd resin is contained in the insulating coating material, whereby the insulating coating material can be provided with flexibility and the time required for curing can be shortened.
The insulating coating material is preferably mixed with a silicone resin having a methylphenyl group and a silicone resin modified with an alkyd resin. Thus, the insulating coating material can achieve high heat resistance and high strength achieved by the silicone resin having a methylphenyl group, and quick-drying properties achieved by the silicone resin modified with an alkyd resin. In the insulating coating material, the mixing ratio of the silicone resin having a methylphenyl group and the silicone resin modified with the alkyd resin is arbitrary. In the insulating coating material, the ratio of the silicone resin having a methylphenyl group may be 50% or more, preferably 70% or more, and more preferably about 80% or more, from the viewpoint of obtaining high heat resistance and high strength. The insulating coating material may contain at least one of a silicone resin having a methylphenyl group and a silicone resin modified with an alkyd resin.
The aggregate particles of the inorganic compound particles may be insulating inorganic compounds. The insulating inorganic compound includes silicon dioxide (SiO) 2 ) Alumina (Al) 2 O 3 ) Zirconium oxide (ZnO) and titanium dioxide (TiO) 2 ) And so on. 1 kind of inorganic compound may be used in the aggregated particles, or a plurality of inorganic compounds may be used in combination. The method for producing the inorganic compound particles is not particularly limited. The inorganic compound particles preferably have a high activity on the particle surface. The higher the activity of the particle surface, the easier the self-aggregation of the inorganic compound particles becomes. Self-aggregation of the inorganic compound particles is easy, and thus aggregated particles can be obtained without using an aggregating agent. The inorganic compound particles are aggregated by intermolecular interactions such as Van der Waals forces.
Fig. 5 is a schematic view of aggregated particles used in the manufacture of the rotor core shown in fig. 2. The inorganic compound particles, i.e., the primary particles, are aggregated by intermolecular interaction of the primary particles with each other. The primary particles are aggregated by the intermolecular interaction, whereby aggregated particles 14 of inorganic compound particles can be obtained without using an aggregating agent such as polyaluminum chloride or sodium aluminate. The aggregated particles 14 are aggregates in which primary particles having a diameter in a range of about 0.1 μm to 5 μm are aggregated. The diameter of the aggregated particles 14 is included in the range of about 0.5 μm to 20 μm.
If the specific surface area of the primary particles changes, the surface area for the same mass changes, and therefore the influence of the effect of the surface of the primary particles changes. Thus, the specific surface area of the primary particles is self-aggregating to the primary particlesThe way is affected. According to embodiment 1, the specific surface area of the primary particles is contained in 0.5m 2 G to 20m 2 In the range of/g, whereby aggregated particles 14 of an appropriate diameter can be obtained by self-aggregation of the primary particles. Self-aggregation of the primary particles can be performed, whereby the aggregated particles 14 can be obtained without using an aggregating agent. Since the aggregating agent is not used, a step of applying the aggregating agent is not required in the production of the cage rotor, and thus the production efficiency of the cage rotor can be improved.
The aggregate particles contained in the insulating coating are not limited to the aggregate particles 14 composed of only inorganic compound particles. Inorganic compound particles and low-melting glass frit, i.e., multi-component glass, may also be contained in the aggregate particles. Examples of the low-melting glass frit include borate, silicate, germanate, vanadate, phosphate, arsenate, or telluride oxides. One may use 1 oxide, or a combination of oxides, in the low melting glass frit.
Fig. 6 is a plan view of slots provided in the rotor core shown in fig. 2. A plurality of holes 10a are formed in each of the steel plates 9a constituting the rotor core 9. The plurality of steel plates 9a have the same shape of a plane perpendicular to the rotation axis AX. The plurality of steel plates 9a are laminated by displacing the shape by a length D in the circumferential direction for each 1 of the plurality of steel plates 9 a. The length D is shorter than the width of the hole 10a in the circumferential direction. Thereby, the position of the hole 10a in each of the steel plates 9a after lamination is shifted by the length D in the circumferential direction. Further, fig. 6 shows the slot 10 before the insulating layer 13 and the conductor 11 are formed.
Fig. 7 is a sectional view showing a portion of the rotor core shown in fig. 2 in which 1 slot is provided. The steel plates 9a constituting the rotor core 9 are each flat plates having a thickness t. The positions of the holes 10a in the steel plates 9a after lamination are shifted by a length D in the circumferential direction, whereby the holes 10a of the steel plates 9a are continuous in a direction inclined with respect to the rotation axis AX. Thereby, the slit 10 inclined with respect to the rotation axis AX is formed. Fig. 7 shows a cross section of the 3 steel plates 9a overlapped with each other, and a cross section parallel to the rotation axis AX and in the circumferential direction.
The slit 10 is formed by a plane parallel to the rotation axis AX and a plane perpendicular to the rotation axis AX, which are surfaces forming an inner wall of the hole 10a. A step is formed for each steel plate 9a on the inner peripheral surface of the slot 10. The insulating layer 13 is formed to cover the step of each steel plate 9 a. The insulating layer 13 contains aggregated particles 14 of inorganic compound particles having a property of self-aggregation of primary particles and at least one silicone resin among silicone resins having a methylphenyl group and silicone resins modified by alkyd resins. The insulating layer 13 is provided limited to the inner circumferential surface of the slot 10.
Fig. 7 schematically shows aggregate particles 14 of inorganic compound particles contained in the insulating layer 13. The diameter d of the aggregated particles 14 is contained in the range of about 0.5 μm to 20 μm. The diameter D of the aggregated particles 14 is shorter than the length D and shorter than the thickness t of each of the plurality of steel plates 9a in the axial direction. Thereby, when the insulating paint is applied, the aggregated particles 14 are filled in the step portion of the inner peripheral surface of the slot 10.
The aggregate particles 14 exert insulation in the insulating layer 13, and also function as spacers of the insulating layer 13. The insulating layer 13 contains the aggregated particles 14, whereby the insulating layer 13 having a thickness necessary for improving the driving efficiency of the induction motor 1 can be formed. In addition, when the insulating paint is applied, the aggregate particles 14 also have a function of flattening the steps on the inner circumferential surfaces of the slots 10. The steps on the inner circumferential surface of the slot 10 are flat, and thus the fluidity of aluminum can be improved when aluminum is cast into the slot 10.
The diluting solvent contained in the insulating coating material contains an organic solvent having a boiling point of 100 degrees or higher. The concentration of the organic solvent in the diluting solvent may be 20wt% or more, preferably 40wt% or more, and more preferably 60wt% or more. The diluting solvent is a solvent capable of dissolving a silicone resin having a methylphenyl group, which is a silicone resin contained in the insulating coating material, and a silicone resin modified with an alkyd resin. The organic solvent of the monomer having a boiling point of 100 degrees or more or a plurality of organic solvents having a boiling point of 100 degrees or more are used in the diluting solvent. As the diluting solvent, a solvent in which an organic solvent having a boiling point of 100 degrees or more and another solvent are mixed may be used. However, the solvent used together with the organic solvent having a boiling point of 100 degrees or higher is preferably a solvent having a boiling point of 30 degrees or higher, more preferably a solvent having a boiling point of 30 degrees to 50 degrees.
By using the organic solvent having a boiling point of 100 degrees or higher and the diluting solvent containing 20wt% or higher as the insulating paint, volatilization of the diluting solvent until the jetted particles of the silicone resin composition reach the rotor core 9 as the adherend can be prevented when the insulating paint is applied by a sprayer. This ensures the viscosity of the insulating paint when the insulating paint is applied. In addition, the unevenness of the surface of the insulating layer 13 can be reduced, and cracking of the insulating layer 13 can be prevented.
Examples of the organic solvent having a boiling point of 100 degrees or higher include toluene, xylene, methyl isobutyl ketone, butyl acetate, anisole, N-dimethylacetamide (DMAc), dimethylsulfoxide (DMSO), and methyl benzoate. Examples of the solvent used together with the organic solvent having a boiling point of 100 degrees or higher include acetone and Tetrahydrofuran (THF).
The organic solvent having a boiling point of 100 degrees or higher is volatilized by heating in the aluminum die casting process, and is thus removed before the heating step of the silicone resin. Therefore, even if the insulating coating material contains a high-boiling-point organic solvent having a temperature of 100 degrees or higher, the generation of bubbles can be suppressed when the insulating coating material is cured.
The concentration of the aggregated particles 14 in the insulating coating excluding the diluting solvent is 30 to 40wt%. The viscosity of the insulating coating material may be in the range of 10 to 1000mPa · s, preferably in the range of 10 to 60mPa · s, and more preferably in the range of 10 to 20mPa · s. By using the insulating coating material having the particle concentration and viscosity set as described above, the insulating layer 13 having the dielectric strength required for improving the driving efficiency of the induction motor 1 can be formed. In addition, the insulating layer 13 having a thickness necessary for improving the driving efficiency of the induction motor 1 can be formed.
By setting the particle concentration and viscosity as described above, the insulating coating material can be applied by spraying. This makes it possible to easily apply the insulating paint and to apply the insulating paint only in a desired range. In addition, by setting the particle concentration and viscosity in the above manner, the insulating paint can be filled in the step portion of the inner circumferential surface of the slit 10. Since the insulating coating material can be made to penetrate into the gap into which aluminum in the rotor core 9 may enter, the insulating coating material can be filled into the gap before casting of aluminum. When the viscosity of the insulating paint is less than 10mPa · s, the insulating paint is excessively diluted, and the thickness of the insulating layer 13 becomes insufficient. When the viscosity of the insulating paint exceeds 1000mPa · s, it is difficult to apply the insulating paint by spraying. When the viscosity of the insulating paint exceeds 60mPa · s, the insulating paint can be applied by spraying, and it is difficult to form the insulating layer 13 having a uniform thickness.
According to embodiment 1, by forming the insulating layer 13 in each of the plurality of slots 10 provided in the rotor core 9, the induction motor 1 can suppress the occurrence of the cross flow, and the driving efficiency can be improved. In the production of the rotor 3, a step of applying an aggregating agent in addition to the step of applying the insulating coating material is not required. Therefore, the production efficiency of the rotor 3 can be improved.
Fig. 8 is a perspective view showing a part of a rotor core included in an induction motor according to embodiment 2. In embodiment 2, the insulating layer 13 is provided in the center portion in the axial direction among the slots 10. In embodiment 2, the same components as those in embodiment 1 described above are denoted by the same reference numerals, and a description will be given mainly of a configuration different from embodiment 1. Fig. 8 shows an insulating layer 13 provided to 1 slot 10.
The length L of the insulating layer 13 in the axial direction is a length greater than or equal to 85% with respect to the entire length L of the slot 10 in the axial direction. The insulating layers 13 are not provided at both end portions of the slot 10 in the axial direction. In the step of forming the insulating layer 13 in manufacturing the rotor 3, the insulating layer 13 is formed in the central portion in the axial direction among the slots 10 in a range of at least 85% of the entire length L of the slots 10.
Since no cross current flows in both end portions of the conductor 11 in the axial direction, even if the conductor 11 and the rotor core 9 are not insulated in both end portions of the slot 10, a loss of driving efficiency due to the occurrence of the cross current is small. By forming the insulating layer 13 in the center of the slit 10, the induction motor 1 suppresses the occurrence of the cross current, and the driving efficiency can be improved.
According to embodiment 2, application of the insulating coating material at both end portions of the slot 10 is not required, and thus the amount of the insulating coating material used in manufacturing the rotor 3 can be reduced. The insulating paint is applied to the center of the slit 10, so that the insulating paint is less likely to overflow from both ends of the slit 10. Therefore, the work of removing the insulating coating material overflowing from the slots 10 is not necessary, and the workability in manufacturing the rotor 3 can be improved. This can improve the production efficiency of the rotor 3.
Fig. 9 is a plan view showing a part of a rotor core included in an induction motor according to embodiment 3. In embodiment 3, the insulating layer 13 is provided on the outer edge side portion, which is the portion of the slot 10 on the opposite side of the rotation axis AX. In embodiment 3, the same components as those in embodiment 1 or 2 are denoted by the same reference numerals, and a description will be given mainly of a configuration different from that in embodiment 1 or 2. Fig. 9 shows an upper surface of a portion of the rotor core 9 where 1 slot 10 is provided.
The length H of the insulating layer 13 in the radial direction of the circle centered on the rotation axis AX is a length greater than or equal to 60% with respect to the length H of the slot 10 in the radial direction. The insulating layer 13 is not provided in the portion on the rotation axis AX side among the slots 10. In the step of forming the insulating layer 13 when manufacturing the rotor 3, the insulating layer 13 is formed in the outer edge side portion of the slot 10. The insulating layer 13 is formed in a range of at least 60% of the length H of the slot 10 in the radial direction with respect to the circle centered on the rotation axis AX among the slots 10.
The driving efficiency of the induction motor 1 is reduced due to harmonic flux interlinking with the conductor 11. The harmonic magnetic flux is generated by a current of a harmonic component, which is a component of a frequency higher than the drive frequency of the rotor 3, flowing through the rotor core 9. Since the harmonic magnetic flux passes only through the outer edge portion of the rotor core 9, the cross flow is less likely to occur in the outer edge side portion of the slots 10. By forming the insulating layer 13 on the outer edge side portion of the slot 10, the induction motor 1 can suppress the occurrence of the cross flow, and the driving efficiency can be improved.
According to embodiment 3, the application of the insulating paint in the portion of the slot 10 on the rotation axis AX side is not required, and thus the amount of the insulating paint used in the production of the rotor 3 can be reduced.
Embodiment 4.
Fig. 10 is a perspective view showing a part of a rotor core of an induction motor according to embodiment 4. In embodiment 4, the insulating layer 13 is provided in the center portion in the axial direction of the slit 10 as in embodiment 2, and is provided in the outer edge side portion of the slit 10 as in embodiment 3. In embodiment 4, the same components as those in embodiments 1 to 3 are denoted by the same reference numerals, and configurations different from those in embodiments 1 to 3 will be mainly described. Fig. 10 shows an insulating layer 13 provided to 1 slot 10.
The length L of the insulating layer 13 in the axial direction is a length greater than or equal to 85% with respect to the entire length L of the slot 10 in the axial direction. The insulating layers 13 are not provided at both end portions of the slot 10 in the axial direction. In the step of forming the insulating layer 13 in manufacturing the rotor 3, the insulating layer 13 is formed in the central portion in the axial direction among the slots 10 and in a range of at least 85% with respect to the entire length L of the slots 10.
The length H of the insulating layer 13 in the radial direction of the circle centered on the rotation axis AX is a length greater than or equal to 60% with respect to the length H of the slot 10 in the radial direction. The insulating layer 13 is not provided in the portion on the rotation axis AX side among the slots 10. In the step of forming the insulating layer when manufacturing the rotor 3, the insulating layer 13 is formed in the outer edge side portion of the slot 10. The insulating layer 13 is formed in a range of at least 60% with respect to the length of the slot 10 in the radial direction of a circle centered on the rotation axis AX among the slots 10.
According to embodiment 4, as in the case of embodiments 2 and 3, the amount of insulating paint used in the production of the rotor 3 can be reduced. In addition, as in the case of embodiment 2, workability in manufacturing the rotor 3 can be improved, and thus production efficiency of the rotor 3 can be improved.
Fig. 11 is a perspective view showing a rotor core included in an induction motor according to embodiment 5. In embodiment 5, the insulating layer 13 is provided in each of the plurality of slots 10 provided in the rotor core 9 at every 1 slot 10 in the circumferential direction of a circle centered on the rotation axis AX. In embodiment 5, the same components as those in embodiments 1 to 4 described above are denoted by the same reference numerals, and configurations different from those in embodiments 1 to 4 will be mainly described.
In the rotor core 9, the slots 10 provided with the insulating layer 13 and the slots 10 not provided with the insulating layer 13 are alternately arranged in the circumferential direction. The insulating layer 13 is provided on the entire inner circumferential surface of the slot 10, as in embodiment 1. In the step of forming the insulating layer 13 in manufacturing the rotor 3, the insulating layer 13 is formed every 1 slot 10 in the circumferential direction. The insulating layer 13 may be provided in the same manner as in embodiment 2, 3, or 4.
The cross current mainly occurs between the conductors 11 of the slots 10 adjacent to each other. Therefore, even if the insulating layer 13 is provided every 1 slot 10 in the circumferential direction, the occurrence of the cross flow in the rotor core 9 can be reduced. The induction motor 1 can suppress the occurrence of a cross current, and the driving efficiency can be improved.
According to embodiment 5, the coating of the insulating coating material in a part of the plurality of slots 10 is not necessary, and thus the amount of the insulating coating material used in the production of the rotor 3 can be reduced.
Embodiment 6.
In embodiment 6, a method of manufacturing a cage rotor will be described. Fig. 12 is a flowchart showing the sequence of the cage rotor manufacturing method according to embodiment 6. The method of manufacturing a cage rotor according to embodiment 6 includes steps S1 to S5. Step S1 is an assembly process of the rotor core 9. Step S2 is a spraying step of the insulating paint. Step S3 is a drying and curing step of the insulating coating material. Step S4 is an aluminum die casting process. Step S5 is a post-processing step.
In the assembling step of the rotor core 9, the plurality of steel plates 9a that have been released from the mold are stacked on each other, and the rotor core 9 is assembled. The steel plates 9a are displaced by a predetermined length in the circumferential direction of a circle centered on the rotation axis AX, and the plurality of steel plates 9a are stacked.
In the spraying step of the insulating paint, the insulating paint is prepared by mixing and stirring at least one silicone resin among a silicone resin having a methylphenyl group, a silicone resin modified by an alkyd resin, aggregated particles of inorganic compound particles, and a diluting solvent. The method of mixing and stirring the materials of the insulating paint is arbitrary. In this step, the materials of the insulating coating material can be mixed and stirred by a method generally used in the technical field of rotor production, as long as aggregated particles of inorganic compound particles can be dispersed. For the mixing and stirring, for example, a usual rotation and revolution type stirrer, a high-pressure shear dispersing device, a homogenizer, a high-speed stirrer, or the like can be used.
Next, the prepared insulating paint is sprayed using a sprayer to the rotor core 9. The insulating paint is sprayed from the upper surface side of the rotor core 9 in the slots 10 toward the inside of the slots 10, thereby applying the insulating paint to the inner circumferential surfaces of the slots 10. The amount of the insulating paint sprayed is adjusted so as to adjust the thickness of the insulating paint on the inner peripheral surface and so as not to cause excess or deficiency in the insulating paint sprayed. In order to spray an appropriate amount of the insulating paint, the time for spraying the insulating paint is accurately controlled.
When the insulating paint is sprayed for an excessively long time, the amount of the insulating paint sprayed becomes excessive, and the thickness of the insulating paint on the inner peripheral surface may become excessive. In addition, a part of the insulating paint sprayed may drop from the slit 10. The insulating coating may penetrate into the rotor core 9. If the time for spraying the insulating paint is too short, the amount of the insulating paint sprayed is insufficient, and the thickness of the insulating paint on the inner peripheral surface may be insufficient. Further, the insulating paint on the inner peripheral surface does not spread, and thus the thickness of the insulating paint covering the inner peripheral surface may not be uniform.
In the step of spraying the insulating paint, the insulating paint is applied to the inner circumferential surface of the slit 10. By the spraying, the insulating paint can be applied within a range where the insulating layer 13 is formed. In the case of spraying, the problem that the insulating paint is applied to a portion where the insulating layer 13 is not necessary can be avoided if compared with the case where the rotor core 9 is immersed in the insulating paint. Further, if compared with the case where the rotor core 9 is immersed in the insulating paint, the problem that the impurities adhering to the rotor core 9 are mixed into the insulating paint in the case of spraying can be avoided.
The drying and curing step of the insulating coating material includes a 1 st step of drying the insulating coating material at room temperature and a 2 nd step of heating the insulating coating material in a furnace. In step 1, the rotor core 9 coated with the insulating paint is left at room temperature for about 1 hour, thereby vaporizing the volatile components contained in the diluent solvent. If the curing by heating is performed without passing through the 1 st step, the vaporization of the volatile component and the curing of the silicone resin proceed simultaneously, and thereby bubbles may be generated on the surface and inside of the insulating coating material. Since the bubbles cause a decrease in insulation resistance, it is necessary to vaporize the volatile components before curing.
In step 2, the dried rotor core 9 having undergone the insulating coating is heated in a furnace, thereby curing the silicone resin having the methylphenyl group. The heating temperature and the heating time are arbitrary as long as the curing of the silicone resin can be completed and the silicone resin does not deteriorate. In embodiment 6, the silicone resin is hardened by heating at 250 degrees for 2 hours in the 2 nd step. If the heating temperature is too low or the heating time is too short, the curing becomes insufficient, and the insulating coating material may not be cured. If the heating time is too long, or if the heating time is too long, the silicone resin deteriorates, and thus the insulating performance of the insulating layer 13 may be reduced.
In the aluminum die casting process, aluminum is cast into the slots 10 in which the insulating layer 13 is formed, thereby forming the conductors 11. The aluminum die casting process is performed by a method generally used in the field of rotor manufacturing.
In the post-processing step, the rotor core 9 having the conductor 11 formed thereon is hot-fitted to the shaft 4, and the rotor core 9 is turned. The post-processing step is performed by a means generally used in the technical field of rotor manufacturing.
Next, effects obtained by the method for manufacturing a cage rotor according to embodiment 6 will be described based on specific examples. Fig. 13 is a diagram for explaining effects obtained by the cage rotor manufacturing method according to embodiment 6. Here, the effect of reducing the stray load loss and the sprayability in the case of manufacturing the rotor 3 using the insulating coating materials manufactured under the respective conditions shown in examples 1 to 20 and comparative examples 1 to 8 will be described. The stray load loss represents a stray load loss of the rotor 3 due to occurrence of a cross current in the rotor core 9. The sprayability indicates a property that a film of the insulating paint having an appropriate thickness can be formed by spraying the insulating paint.
In fig. 13, with respect to examples 1 to 20 and comparative examples 1 to 8, respective conditions relating to the material and viscosity of the insulating coating are shown. In example 1, as the silicone resin, a silicone resin having a methylphenyl group and a silicone resin modified by an alkyd resin are used. In fig. 13, "methylphenyl" represents a silicone resin having a methylphenyl group. In FIG. 13, "alkyd" refers to a silicone resin modified by an alkyd resin.
In example 1, the specific surface area of the inorganic compound particles, i.e., the primary particles, was 10m 2 The diameter of the aggregated particles 14, i.e., the particle diameter, was 10 μm, and the concentration of the aggregated particles 14 in the insulating coating except for the diluting solvent was 35wt%. In example 1, the diluting solvent was a mixed solvent of xylene and toluene. In factIn example 1, the viscosity of the insulating coating material was 15mPa · s.
In examples 2 to 20 and comparative examples 1 to 8, at least 1 of the conditions relating to the inorganic compound particles, i.e., the specific surface area, the particle diameter and the concentration, and the viscosity of the insulating coating material, is different from the case of example 1.
In fig. 13, the effect of reducing the stray load loss and the evaluation results and the comprehensive evaluation of each item concerning the sprayability are shown for examples 1 to 20 and comparative examples 1 to 8, respectively. The evaluation and the comprehensive evaluation for each item are each represented by 4 of "a", "B", "C", and "D". "A" represents the highest evaluation among 4 of "A", "B", "C" and "D". The evaluations were decreased in the order of "a", "B", "C" and "D". In the effect of reducing the stray load loss, "C" represents an evaluation corresponding to the case where the insulating coating material is not applied. In the sprayability, "D" indicates that spraying is impossible.
The comprehensive evaluation represents relative evaluation based on example 1 and comparative example 1. "a" of the overall evaluation indicates the evaluation equivalent to example 1 or the evaluation higher than example 1. The "B" and "C" of the overall evaluation are higher than those of comparative example 1 and lower than those of example 1. "D" of the comprehensive evaluation indicates a failure, that is, a failure in manufacturing the rotor 3.
The action and effect produced by the diameter of the aggregated particles 14 being included in the range of 0.5 μm to 20 μm can be explained by comparison of examples 1-3, 15-20 and comparative examples 1, 2, 7, 8. For example, the particle diameters of examples 1 to 3 are 10 μm, 15 μm and 20 μm, respectively, and are included in the range of 0.5 μm to 20 μm. In contrast, comparative examples 1, 2, 7 and 8, in which the particle diameters were 0.3 μm, 27 μm, 35 μm and 0.4 μm, respectively, were not included in the range of 0.5 μm to 20 μm.
The aggregate particles 14 have a function of improving the dielectric breakdown voltage of the entire insulating layer 13 according to the height of the dielectric breakdown voltage of the aggregate particles 14. Also, the aggregate particles 14 have a function as a spacer for making the insulating layer 13 have a thickness for obtaining a desired dielectric breakdown voltage. In the case of comparative examples 1, 8, the particle diameter was less than 0.5 μm, and therefore, the insulating layer 13 having a thickness for obtaining a desired dielectric breakdown voltage could not be formed. In the case of comparative example 2, the particle diameter exceeds 20 μm, and therefore the aggregated particles 14 are liable to settle in the liquid, i.e., the insulating coating material. Therefore, it is difficult to uniformly disperse the aggregate particles 14 on the inner circumferential surfaces of the slots 10 and to spray the insulating paint.
On the other hand, in examples 1 to 3 and 15 to 20, the particle size was included in the range of 0.5 μm to 20 μm in any case, and thereby the sedimentation of the aggregated particles 14 in the insulating coating material could be reduced, and therefore the aggregated particles 14 could be uniformly dispersed and the insulating coating material could be sprayed. In addition, the insulating layer 13 having a thickness for obtaining a desired dielectric breakdown voltage can be formed. Therefore, in examples 1 to 3 and 15 to 20, the effect of reducing the stray load loss becomes high.
The specific surface area of the inorganic compound particles, i.e., the primary particles, is contained in 0.5m 2 G to 20m 2 The action and effect of the catalyst in the range of/g can be illustrated by comparing examples 17 to 20 with comparative examples 1 and 2. Each specific surface area in examples 17 to 20 was 0.5m 2 /g、1m 2 /g、5m 2 /g、20m 2 Each of which is contained in 0.5m 2 G to 20m 2 (ii) a range of/g. In contrast, the specific surface areas of comparative examples 1 and 2 were 100m, respectively 2 /g、0.3m 2 Each of which is not contained in 0.5m 2 G to 20m 2 (ii) a range of/g.
If the specific surface area of the primary particles changes, the surface area for the same mass changes, and therefore the influence of the effect of the surface of the primary particles changes. Therefore, the specific surface area of the primary particles influences the manner of self-aggregation of the primary particles. The smaller the specific surface area of the primary particles, the larger the size of the single primary particles becomes, and thus the larger the diameter of the aggregated particles 14 obtained by self-aggregation of the primary particles becomes. The larger the specific surface area of the primary particles, the smaller the size of the single primary particles becomes, and therefore the smaller the diameter of the aggregated particles 14 obtained by self-aggregation of the primary particles also becomes. In the case of comparative example 1, the specific surface area was exceededOver 20m 2 The aggregate particles 14 have a diameter of 0.3. Mu.m/g. In this case, the diameter of the aggregated particles 14 is less than 0.5 μm, and therefore the insulating layer 13 having a thickness for obtaining a desired insulation withstand voltage cannot be formed. In the case of comparative example 2, the specific surface area was less than 0.5m 2 G and the diameter of the aggregated particles 14 was 27 μm. In this case, the diameter of the aggregated particles 14 exceeds 20 μm, and therefore the aggregated particles 14 are liable to settle in the liquid, that is, the insulating paint.
In contrast, in examples 17 to 20, the specific surface area was contained in 0.5m in any case 2 G to 20m 2 A range of/g, whereby the diameter of the aggregated particles 14 obtained by self-aggregation of the primary particles is contained in a range of 0.5 μm to 20 μm. As described above, the aggregated particles 14 of an appropriate diameter are obtained by self-aggregation of primary particles. Has a property of self-aggregation of primary particles, and therefore aggregated particles 14 can be obtained without using an aggregating agent. Since no aggregating agent is used, a step of coating the aggregating agent is not required, and the production efficiency of the cage rotor can be improved. Therefore, in examples 17 to 20, the production efficiency of the cage rotor can be improved.
The action and effect caused by the concentration of the aggregated particles 14 being included in the range of 30wt% to 40wt% can be explained by comparing examples 4, 5 and comparative examples 3, 4. The respective concentrations of the aggregated particles 14 in examples 4 and 5 were 30wt% and 40wt%, respectively, and both were included in the range of 30wt% to 40wt%. In contrast, the respective concentrations of the aggregated particles 14 in comparative examples 3, 4 were 20wt%, 50wt%, respectively, and were not included in the range of 30wt% to 40wt%.
Generally, the dielectric breakdown voltage of the inorganic compound particles is higher than that of the organic compound. Here, the organic compound is a silicone resin having a methylphenyl group. In order to improve the dielectric breakdown voltage, inorganic compound particles are filled in an organic compound. In the composite of the organic compound and the inorganic compound, the more the inorganic compound particles are filled, the more the dielectric breakdown voltage in the composite can be improved. In the case of comparative example 3, the concentration of the aggregated particles 14 was less than 30wt%, and therefore the dielectric breakdown voltage of the composite, i.e., the insulating layer 13, could not be improved. As a result, in comparative example 3, the effect of reducing the stray load loss is reduced. In addition, in the composite of the organic compound and the inorganic compound, the more the inorganic compound particles are filled, the higher the viscosity of the composite becomes. In the case of comparative example 4, the concentration of the aggregated particles 14 exceeded 40wt%, and therefore the viscosity of the composite, i.e., the insulating coating material, became high. In comparative example 4, spraying of the insulating coating material became difficult.
In contrast, in examples 4 and 5, the filling amount of the inorganic compound particles was adjusted to an appropriate range, that is, a range of 30wt% to 40wt%, thereby achieving both the improvement of the dielectric strength of the insulating layer 13 and the suppression of the viscosity of the insulating coating material. Thus, in examples 4 and 5, the effect of reducing the stray load loss is improved, and the decrease in sprayability can be suppressed.
The operation and effect of the insulating coating material having a viscosity in the range of 10 to 1000 mPas can be described by comparing examples 6 to 14 with comparative examples 5 and 6. In the present invention, the insulating coating material is sprayed by spraying, so that the insulating coating material can be easily applied and the insulating coating material can be applied only to a desired range. The coatability of the spray coating and the viscosity of the insulating coating material are related to the adhesion. If the viscosity of the insulating paint is too high, it becomes difficult to spray the insulating paint by the air pressure of the sprayer. Further, if the viscosity of the insulating paint is too low, the insulating paint flows down from the slit 10 until the insulating paint is cured after the insulating paint is sprayed, and thus it is difficult to make the insulating layer 13 have a thickness for obtaining a high dielectric breakdown voltage.
The viscosities in examples 6 to 14 were 10 mPas, 20 mPas, 23 mPas, 37 mPas, 60 mPas, 75 mPas, 100 mPas, 500 mPas and 1000 mPas, respectively, and were all in the range of 10 mPas to 1000 mPas. In contrast, the viscosities of comparative examples 5 and 6 were 9 mPas and 1100 mPas, respectively, and were not included in the range of 10 to 1000 mPas.
In the case of comparative example 5, the viscosity of the insulating coating was less than 10mPa · s, and therefore the insulating layer 13 could not be made to have a thickness for obtaining a high dielectric breakdown voltage. In the case of comparative example 6, the viscosity of the insulating coating material exceeded 1000mPa · s, and therefore the insulating coating material could not be sprayed.
On the other hand, in examples 6 to 14, the viscosity was included in the range of 10mPa · s to 1000mPa · s in any case, and thus the insulating layer 13 could be made to have a thickness for obtaining a high dielectric strength, and the insulating paint could be sprayed. As described above, the effect of reducing the stray load loss is obtained in the case where the viscosity is included in the range of 10mPa · s to 1000mPa · s. Further, as a result of extensive studies, it was confirmed that the effect of reducing the stray load loss is higher when the viscosity is in the range of 10mPa · s to 60mPa · s, and is highest when the viscosity is in the range of 10mPa · s to 20mPa · s.
The configurations described in the above embodiments illustrate an example of the contents of the present invention. The configurations of the respective embodiments can be combined with other known techniques. The structures of the respective embodiments may be combined with each other as appropriate. A part of the structure of each embodiment may be omitted or modified within a range not departing from the gist of the present invention.
Description of the reference numerals
1 induction motor, 2 stator, 3 rotor, 4 shaft, 5 housing, 6 frame, 6a bottom, 7 end plate, 8 bearing, 9 rotor core, 9a steel plate, 10 slots, 10a holes, 11 conductor, 12 short ring, 13 insulation layer, 14 aggregate particles, AX rotation axis.
Claims (15)
1. A method of manufacturing a cage rotor, the cage rotor comprising: a rotor core that is a laminated body of a plurality of steel plates; and conductors respectively accommodated in a plurality of slots arranged in a circumferential direction of a circle centered on the rotation axis in the rotor core,
the method of manufacturing the cage rotor is characterized in that,
comprises applying an insulating coating material to the inner peripheral surfaces of the narrow grooves to form insulating layers in the narrow grooves,
the insulating coating contains at least one silicone resin among silicone resins having methylphenyl groups and silicone resins modified by alkyd resins, aggregated particles of inorganic compound particles having a property of primary particle self-aggregation, and a diluting solvent.
2. A method of manufacturing a cage rotor according to claim 1,
the specific surface area of the primary particles is contained in the range of from 0.5m 2 G to 20m 2 (ii) a range of/g.
3. A method of manufacturing a cage rotor according to claim 1 or claim 2,
in the step of forming the insulating layer, the insulating paint is applied to the inner circumferential surface.
4. A method of manufacturing a cage rotor according to any of claims 1 to 3,
in the step of forming the insulating layer, the insulating paint is applied by spraying.
5. A method of manufacturing a cage rotor according to any of claims 1 to 4,
the plurality of steel plates each having the same shape, and the plurality of steel plates being stacked by displacing the shape by a predetermined length in the circumferential direction for each 1 of the plurality of steel plates, whereby the plurality of slits are each inclined with respect to the rotation axis,
the diameter of the aggregated particles is shorter than the length and is shorter than the thickness of each of the plurality of steel plates in the direction of the rotation axis.
6. A method of manufacturing a cage rotor according to any of claims 1 to 5,
the aggregated particles are aggregates in which the primary particles having diameters in the range of from 0.1 to 5 μm are aggregated,
the diameter of the aggregated particles is comprised in the range from 0.5 μm to 20 μm.
7. A method of manufacturing a cage rotor according to any of claims 1 to 6,
the concentration of the aggregated particles in the insulating coating excluding the diluting solvent is included in a range from 30wt% to 40wt%.
8. A method of manufacturing a cage rotor according to any of claims 1 to 7,
the viscosity of the insulating coating is in the range of 10 to 1000 mPas.
9. A method of manufacturing a cage rotor according to any of claims 1 to 8,
in the step of forming the insulating layer, the insulating layer is formed in a range of at least 85% of a central portion of the slit in the direction of the rotation axis with respect to a total length of the slit in the direction of the rotation axis.
10. A method of manufacturing a cage rotor according to any of claims 1 to 9,
in the step of forming the insulating layer, the insulating layer is formed on an outer edge portion of the slot on the opposite side to the rotation axis.
11. A method of manufacturing a cage rotor according to claim 10,
the insulating layer is formed in a range in which a length of the slot in a radial direction with respect to a circle centered on the rotation axis among the slots is at least 60%.
12. A method of manufacturing a cage rotor according to any of claims 1 to 11,
in the step of forming the insulating layer, the insulating layer is formed every 1 slot in the circumferential direction among the plurality of slots.
13. A cage-type rotor is characterized in that,
comprising:
a rotor core that is a laminated body of a plurality of steel plates;
conductors respectively housed in a plurality of slots arranged in a circumferential direction of a circle centered on a rotation axis in the rotor core; and
an insulating layer provided on an inner peripheral surface of a slot included in the plurality of slots,
the insulating layer contains aggregated particles of inorganic compound particles having a property of self-aggregation of primary particles and at least one silicone resin among silicone resins having a methylphenyl group and silicone resins modified by an alkyd resin.
14. The cage rotor of claim 13,
the specific surface area of the primary particles is contained in the range of from 0.5m 2 G to 20m 2 (ii) a range of/g.
15. The cage rotor of claim 13 or 14,
the insulating layer is defined on the inner circumferential surface.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2020/019496 WO2021229807A1 (en) | 2020-05-15 | 2020-05-15 | Method for producing squirrel-cage rotor, and squirrel-cage rotor |
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| CN115516744A true CN115516744A (en) | 2022-12-23 |
| CN115516744B CN115516744B (en) | 2023-07-21 |
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| JP (1) | JP6877657B1 (en) |
| CN (1) | CN115516744B (en) |
| WO (1) | WO2021229807A1 (en) |
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| JPS60121946A (en) * | 1983-11-30 | 1985-06-29 | Toshiba Corp | Manufacture of squirrel-cage rotor |
| JPS61112552A (en) * | 1984-11-06 | 1986-05-30 | Yaskawa Electric Mfg Co Ltd | Manufacture of squirrel-cage rotor |
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| JP2002315282A (en) * | 2001-04-13 | 2002-10-25 | Mitsubishi Electric Corp | Induction motor rotor and manufacturing method therefor |
| JP2014222973A (en) * | 2013-05-13 | 2014-11-27 | 日本化薬株式会社 | Coil filled with thermally conductive heat-resistant insulating material, production method thereof, motor and transformer |
| JP2015086358A (en) * | 2013-09-26 | 2015-05-07 | パナソニックＩｐマネジメント株式会社 | Thermosetting (meth)acrylic resin composition and molded body |
| CN104620476A (en) * | 2012-08-31 | 2015-05-13 | 三菱电机株式会社 | Rotary electric machine and manufacturing method therefor |
| WO2017014067A1 (en) * | 2015-07-23 | 2017-01-26 | 日本電気硝子株式会社 | Glass filler and resin composition for solid object modeling using same |
| WO2019176107A1 (en) * | 2018-03-16 | 2019-09-19 | 三菱電機株式会社 | Induction motor rotor and induction motor |
-
2020
- 2020-05-15 JP JP2020555526A patent/JP6877657B1/en active Active
- 2020-05-15 WO PCT/JP2020/019496 patent/WO2021229807A1/en active Application Filing
- 2020-05-15 CN CN202080100435.7A patent/CN115516744B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60121946A (en) * | 1983-11-30 | 1985-06-29 | Toshiba Corp | Manufacture of squirrel-cage rotor |
| JPS61112552A (en) * | 1984-11-06 | 1986-05-30 | Yaskawa Electric Mfg Co Ltd | Manufacture of squirrel-cage rotor |
| JPH01110561A (en) * | 1987-10-24 | 1989-04-27 | Calp Corp | Composite resin composition for motor rotor |
| JP2002315282A (en) * | 2001-04-13 | 2002-10-25 | Mitsubishi Electric Corp | Induction motor rotor and manufacturing method therefor |
| CN104620476A (en) * | 2012-08-31 | 2015-05-13 | 三菱电机株式会社 | Rotary electric machine and manufacturing method therefor |
| JP2014222973A (en) * | 2013-05-13 | 2014-11-27 | 日本化薬株式会社 | Coil filled with thermally conductive heat-resistant insulating material, production method thereof, motor and transformer |
| JP2015086358A (en) * | 2013-09-26 | 2015-05-07 | パナソニックＩｐマネジメント株式会社 | Thermosetting (meth)acrylic resin composition and molded body |
| WO2017014067A1 (en) * | 2015-07-23 | 2017-01-26 | 日本電気硝子株式会社 | Glass filler and resin composition for solid object modeling using same |
| WO2019176107A1 (en) * | 2018-03-16 | 2019-09-19 | 三菱電機株式会社 | Induction motor rotor and induction motor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2021229807A1 (en) | 2021-11-18 |
| CN115516744B (en) | 2023-07-21 |
| JP6877657B1 (en) | 2021-05-26 |
| WO2021229807A1 (en) | 2021-11-18 |
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