CN115516744B - Method for manufacturing cage rotor and cage rotor - Google Patents
Method for manufacturing cage rotor and cage rotor Download PDFInfo
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- CN115516744B CN115516744B CN202080100435.7A CN202080100435A CN115516744B CN 115516744 B CN115516744 B CN 115516744B CN 202080100435 A CN202080100435 A CN 202080100435A CN 115516744 B CN115516744 B CN 115516744B
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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
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- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Induction Machinery (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
A rotor (3) manufactured by a cage rotor manufacturing method comprises: a rotor core (9) which is a laminate of a plurality of steel plates (9 a); and conductors (11) which are respectively accommodated in a plurality of slots (10) arranged in the circumferential direction of a circle centering on the rotation axis in the rotor core (9). The method for manufacturing the cage rotor comprises a step of forming an insulating layer (13) in the slot (10) by applying an insulating paint to the inner peripheral surfaces of the slots (10) included in the plurality of 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 self-aggregation of primary particles, and a diluting solvent.
Description
Technical Field
The present invention relates to a method for manufacturing a cage rotor of an induction motor and a cage rotor.
Background
Induction motors are most used in motors because of their robustness and the advantage of being able to start by direct connection to a power source. A cage rotor for use in an induction motor has conductors received in each of a plurality of slots in a rotor core and 2 shorting rings connected to each conductor. In the cage rotor, if insulation between the conductor and the rotor core is insufficient, a cross current, which is a current flowing from one conductor to the other conductor through the rotor core, may occur. The cross current is a current component that does not contribute to the driving of the induction motor, and thus the driving efficiency of the induction motor decreases due to the generation of the cross current. In order to enable efficient driving of the induction motor, it is desirable to electrically insulate the conductor from the rotor core.
Patent document 1 discloses a method in which an inorganic aggregating agent is applied to each slot formed in a rotor core after a water-soluble inorganic insulating treatment liquid is applied thereto, and the entire rotor core is dried to cure the inorganic aggregating agent and the inorganic insulating treatment liquid. According to the method disclosed in patent document 1, inorganic particles contained in an inorganic insulating treatment liquid are aggregated by applying an inorganic aggregating agent, thereby forming an insulating layer on the inner peripheral surface of each slot. Then, a metal material, which is a material of the conductor, is cast into each slot in which the insulating layer is formed, whereby the conductor is formed in each slot. By forming an insulating layer in each slot, electrical insulation between each conductor and the rotor core is ensured.
Patent document 1: japanese patent laid-open 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 applying the inorganic aggregating agent. According to the conventional method, 2 coating steps are required in the manufacture of the cage rotor, and thus there is a problem in 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 of the present invention 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-described problems and achieve the object, a method for manufacturing a cage rotor according to the present invention includes: a rotor core which is a laminate of a plurality of steel plates; and conductors which are respectively accommodated in a plurality of slots arranged in the rotor core in the circumferential direction of a circle centering on the rotation axis. The method for manufacturing a cage rotor according to the present invention includes a step of forming an insulating layer in a slot by applying an insulating paint to an inner peripheral surface of the slot included in a plurality of slots. 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 self-aggregation of primary particles, and a diluting solvent.
ADVANTAGEOUS EFFECTS OF INVENTION
The method for manufacturing a cage rotor according to the present invention has an effect of improving the productivity of the cage rotor.
Drawings
Fig. 1 is a diagram showing an induction motor according to embodiment 1.
Fig. 2 is an oblique view showing a rotor core of the 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 cross-sectional view showing a portion provided with 1 slot among the rotor cores shown in fig. 2.
Fig. 8 is an oblique view showing a part of a rotor core included in the induction motor according to embodiment 2.
Fig. 9 is a plan view showing a part of a rotor core included in the induction motor according to embodiment 3.
Fig. 10 is an oblique view showing a part of a rotor core included in the induction motor according to embodiment 4.
Fig. 11 is an oblique view showing a rotor core of an induction motor according to embodiment 5.
Fig. 12 is a flowchart showing a procedure of a method for manufacturing a cage rotor according to embodiment 6.
Fig. 13 is a diagram for explaining effects obtained by the method for manufacturing a cage rotor according to embodiment 6.
Detailed Description
A method for manufacturing a cage rotor and a cage rotor according to embodiments will be described in detail below with reference to the drawings.
Embodiment 1.
Fig. 1 is a diagram showing an induction motor according to embodiment 1. The induction motor 1 according to embodiment 1 includes: a cylindrical stator 2; a rotor 3 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 the rotation center of the rotor 3. In fig. 1, a longitudinal section of an induction motor 1 is shown on the right side of a rotation axis AX. Further, 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.
The housing 5, which is the casing of the induction motor 1, has a cylindrical frame 6 and an end plate 7. The frame 6 includes a bottom 6a at one end in the axial direction among the frames 6. The other end in the axial direction in the frame 6 is open. An 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. 1 bearing 8 is provided at the bottom 6a of the frame 6. Another 1 bearing 8 is provided on the end plate 7.
The rotor 3 has a rotor core 9, which is a laminate of a plurality of steel plates. The rotor core 9 is provided with a plurality of slots 10 arranged in the 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 conductivity, for example, aluminum. The rotor 3 has 2 shorting rings 12. The 1 shorting ring 12 is provided at one end in the axial direction among the rotor cores 9. The other 1 shorting ring 12 is provided at the other end in the axial direction among the rotor cores 9. Each shorting ring 12 is connected to each of the plurality of conductors 11. The material of each shorting ring 12 is the same as the material of the conductor 11, for example aluminum.
Fig. 2 is an oblique view showing a rotor core of the 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 bonding. The plurality of steel plates 9a may not be fixed to each other.
The plurality of slots 10 are each arranged at equal intervals in the circumferential direction. An insulating layer 13 is provided on the inner peripheral 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 a slot 10 provided with an insulating layer 13.
Fig. 3 is a plan view showing a part of the rotor core shown in fig. 2. Fig. 3 shows the upper surface of a portion of the rotor core 9 where 1 slot 10 is provided. The shape of the slot 10 in the cross section shown in fig. 3 is a shape in which the width in the circumferential direction becomes larger as it is distant from the rotation axis AX. 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 slots 10 are formed in each of a plurality of steel plates 9a constituting rotor core 9. The plurality of steel plates 9a are each of 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 of the plurality of steel plates 9a, whereby the plurality of slots 10 are each inclined with respect to the rotation axis AX. That is, each of the plurality of slots 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 described. The insulating layer 13 is formed by applying an insulating paint to the inner peripheral 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 from among silicone resins having a methylphenyl group and silicone resins modified with an alkyd resin. The insulating coating material contains an inorganic substanceAggregate particles of the compound particles and a diluent solvent. The specific surface area of the inorganic compound particles, which are primary particles, is contained in 0.5m 2 /g to 20m 2 Inorganic compound particles in the range of/g. The insulating paint to be applied is dried by leaving the rotor core 9 coated with the insulating paint in the atmosphere. The insulating paint is heated in a preliminary drying oven.
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 a silicone resin in which a phenyl group (C 6 H 5 ) And is made up of the steps of. Chemical formula (1) shown below shows an example of the chemical structure of a silicone resin having a methylphenyl group.
[ chemical formula 1 ]
By introducing a methylphenyl group, the heat resistance of the silicone resin is improved. By including the methylphenyl group-containing silicone resin in the insulating paint, decomposition and carbonization of the insulating paint do not occur at a temperature of about 250 ℃, and the mechanical strength of the insulating paint at the time of drying and heating can be improved. In the aluminum die casting process for forming the conductor 11, the insulating coating is at a temperature of about 700 ℃ for a period of 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 ensure a desired short-term heat resistance in the aluminum die casting process.
The numbers of repeating units in the chemical formula (1), that is, "m" and "n", are arbitrary numbers. From the viewpoints of the viscosity of the insulating paint, the strength of the insulating paint, and the heat resistance of the insulating paint, the silicone resin having a methylphenyl group is preferably a polymer of a trimer or more. In addition, the molecular weight of the silicone resin having a methylphenyl group is preferably 1000 or more.
The silicone resin modified by the alkyd resin is obtained by a reaction of an oligomer as the silicone resin and the alkyd resin, or a reaction of a polymer as the silicone resin and the alkyd resin. Alkyd resins are polymeric esters obtained by polycondensation of a polyacid and a polyol. Chemical formula (2) shown below shows an example of the chemical structure of an alkyd resin.
[ chemical formula 2 ]
Silicone resins modified with alkyd resins have the characteristics of alkyds, namely softness and quick-drying. The silicone resin modified with the alkyd resin is contained in the insulating paint, whereby the insulating paint can be given flexibility and the time required for curing can be shortened.
The insulating paint 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 obtain high heat resistance and high strength achieved by the silicone resin having a methylphenyl group and quick-drying property achieved by the silicone resin modified with the alkyd resin. In the insulating paint, the mixing ratio of the silicone resin having a methylphenyl group and the silicone resin modified with an alkyd resin is arbitrary. From the viewpoint of obtaining high heat resistance and high strength, the ratio of the silicone resin having a methylphenyl group in the insulating coating material may be 50% or more, preferably 70% or more, and more preferably about 80%. The insulating paint 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. Examples of the insulating inorganic compound include silicon dioxide (SiO 2 ) Alumina (Al) 2 O 3 ) Zirconium oxide (ZnO) and titanium dioxide (TiO) 2 ) Etc. In the aggregated particles, 1 kind of inorganic compound may be used, or a plurality of kinds of inorganic compounds may be used in combination. Process for producing inorganic compound particlesThe present invention is not particularly limited. The inorganic compound particles preferably have 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. The self-aggregation of the inorganic compound particles is easy, whereby aggregated particles can be obtained without using an aggregating agent. The inorganic compound particles aggregate 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., primary particles, are aggregated by intermolecular interactions of the primary particles with each other. By aggregating the primary particles by intermolecular interaction, aggregated particles 14 of inorganic compound particles can be obtained even without using an aggregating agent such as polyaluminum chloride or sodium aluminate. The aggregated particles 14 are aggregates of primary particles having diameters in the range of about 0.1 μm to 5 μm. 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 is changed, the surface area for the same mass is changed, and thus the influence of the effect of the surface of the primary particles is changed. Thus, the specific surface area of the primary particles affects the manner in which the primary particles self-aggregate. According to embodiment 1, the specific surface area of the primary particles is contained in 0.5m 2 /g to 20m 2 The range of/g, whereby aggregated particles 14 of an appropriate diameter can be obtained by self-aggregation of 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 process of applying the aggregating agent is not required in the manufacture of the cage rotor, and thus the productivity 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 a low melting glass frit, i.e., a multicomponent glass, may also be included in the aggregated particles. Examples of the low-melting glass frit include borates, silicates, germanates, vanadates, phosphates, arsenates, and tellurides. In the low melting frit, 1 oxide may be used, or a combination of oxides may be used.
Fig. 6 is a plan view of a slot 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 as a plane perpendicular to the rotation axis AX. The plurality of steel plates 9a are stacked by displacing the shape by the length D in the circumferential direction for each 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 positions of the holes 10a in the stacked steel plates 9a are 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 cross-sectional view showing a portion provided with 1 slot among the rotor cores shown in fig. 2. The steel plates 9a constituting the rotor core 9 are each flat plates of thickness t. The positions of the holes 10a in the stacked steel plates 9a are shifted by the length D in the circumferential direction, whereby the holes 10a of the steel plates 9a are connected in a direction inclined with respect to the rotation axis AX. Thereby, the slot 10 inclined with respect to the rotation axis AX is formed. Fig. 7 shows a cross section of 3 steel plates 9a overlapping each other, and a cross section parallel to the rotation axis AX and along the circumferential direction.
The slot 10 is constituted by a plane parallel to the rotation axis AX and a plane perpendicular to the rotation axis AX, which constitute the surface of the 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 steps of the respective steel plates 9 a. The insulating layer 13 contains aggregated particles 14 of inorganic compound particles having a property that primary particles are self-aggregated 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 so as to be limited to the inner peripheral surface of the slot 10.
Fig. 7 schematically shows aggregated particles 14 of inorganic compound particles contained in the insulating layer 13. The diameter d of the aggregated particles 14 is included 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. Thus, when the insulating paint is applied, the step portion of the inner peripheral surface of the slot 10 is filled with the aggregated particles 14.
The aggregated particles 14 exert insulating properties 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 required for improving the driving efficiency of the induction motor 1 can be formed. In addition, the aggregated particles 14 also have a function of flattening the steps of the inner peripheral surface of the slot 10 when the insulating paint is applied. The steps of the inner peripheral surface of the slot 10 are flattened, whereby the fluidity of aluminum when casting the aluminum into the slot 10 can be improved.
The diluting solvent contained in the insulating coating material contains an organic solvent having a boiling point of 100 ℃ or higher. The concentration of the organic solvent in the diluting solvent is not less than 20% by weight, preferably not less than 40% by weight, more preferably not less than 60% by weight. The diluting solvent is a solvent capable of dissolving a silicone resin contained in the insulating paint, that is, a silicone resin having a methylphenyl group, and a silicone resin modified with an alkyd resin. An organic solvent of a monomer having a boiling point of 100 ℃ or more, or a plurality of organic solvents having a boiling point of 100 ℃ or more is used in the diluting solvent. As the diluting solvent, a solvent in which an organic solvent having a boiling point of 100 ℃ or higher and other solvents are mixed may be used. However, the solvent which is used in combination with the organic solvent having a boiling point of 100℃or higher is preferably a solvent having a boiling point of 30℃or higher, more preferably a solvent having a boiling point of 30℃to 50 ℃.
When an organic solvent having a boiling point of 100 ℃ or higher is used for the insulating paint, containing 20wt% or more of a diluting solvent, volatilization of the diluting solvent until the particles of the ejected silicone resin composition reach the rotor core 9, which is an 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, irregularities on 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℃or higher include toluene, xylene, methyl isobutyl ketone, butyl acetate, anisole, N, N-dimethylacetamide (DMAc), dimethyl sulfoxide (DMSO), and methyl benzoate. Examples of the solvent which can be used in combination with an organic solvent having a boiling point of 100℃or higher include acetone and Tetrahydrofuran (THF).
The organic solvent having a boiling point of 100 ℃ or higher is volatilized by heating in the aluminum die casting process, and thus is removed before the heating process of the silicone resin. Therefore, even if a high boiling point organic solvent of 100 ℃ or higher is contained in the insulating paint, the occurrence of bubbles at the time of hardening the insulating paint can be suppressed.
The concentration of the aggregated particles 14 in the insulating coating other than the diluting solvent is 30wt% 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, more preferably in the range of 10 to 20mpa·s. By using the insulating paint having the particle concentration and viscosity set as described above, the insulating layer 13 having an insulation voltage resistance required for improving the driving efficiency of the induction motor 1 can be formed. In addition, the insulating layer 13 having a thickness required for improving the driving efficiency of the induction motor 1 can be formed.
By setting the particle concentration and viscosity in the above manner, the insulating paint can be applied by spraying. This makes it possible to easily apply the insulating paint and to apply the insulating paint only to a desired range. In addition, by setting the particle concentration and viscosity in the above manner, the insulating paint can be filled into the stepped portion of the inner peripheral surface of the slot 10. Since the insulating paint can be allowed to penetrate into the gap where aluminum in the rotor core 9 may enter, the insulating paint can be filled into the gap before casting of aluminum. In addition, when the viscosity of the insulating paint is less than 10mpa·s, dilution of the insulating paint becomes excessive, and the thickness of the insulating layer 13 becomes insufficient. In addition, 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 insulating layers 13 in each of the plurality of slots 10 provided in rotor core 9, induction motor 1 can suppress occurrence of 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 an insulating paint is not required. Therefore, the production efficiency of the rotor 3 can be improved.
Embodiment 2.
Fig. 8 is an oblique view showing a part of a rotor core included in the induction motor according to embodiment 2. In embodiment 2, the insulating layer 13 is provided at the central portion in the axial direction in the slot 10. In embodiment 2, the same reference numerals are given to the same constituent elements as those in embodiment 1 described above, and mainly different configurations from embodiment 1 will be described. In fig. 8, an insulating layer 13 is shown arranged in 1 slot 10.
The length L of the insulating layer 13 in the axial direction is 85% or more of the length L 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 process of forming the insulating layer 13, the insulating layer 13 is formed in the central portion in the axial direction of the slot 10 and in a range of at least 85% with respect to the entire length L of the slot 10 at the time of manufacturing the rotor 3.
Since the cross flow does not flow at the both ends of the conductor 11 in the axial direction, the loss of the driving efficiency due to the occurrence of the cross flow is small even if the conductor 11 and the rotor core 9 are not insulated at the both ends of the slot 10. By forming the insulating layer 13 at the center of the slot 10, the induction motor 1 suppresses occurrence of cross flow, and the driving efficiency can be improved.
According to embodiment 2, the use amount of the insulating paint in the manufacture of the rotor 3 can be reduced by eliminating the need for applying the insulating paint to both end portions of the slot 10. The insulating paint is applied to the center portion of the slit 10, so that the insulating paint is less likely to overflow from both ends of the slit 10. Therefore, the insulating paint overflowing from the slot 10 does not need to be removed, and workability in manufacturing the rotor 3 can be improved. Thereby, the production efficiency of the rotor 3 can be improved.
Embodiment 3.
Fig. 9 is a plan view showing a part of a rotor core included in the induction motor according to embodiment 3. In embodiment 3, the insulating layer 13 is provided in the outer edge side portion, which is a portion on the opposite side of the rotation axis AX in the slot 10. In embodiment 3, the same reference numerals are given to the same constituent elements as those in embodiment 1 or 2 described above, and mainly the configuration different from embodiment 1 or 2 will be described. Fig. 9 shows the 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 greater than or equal to 60% of the length H of the slot 10 in the radial direction. The insulating layer 13 is not provided at the portion of the slot 10 on the side of the rotation axis AX. In the process of forming the insulating layer 13 in the manufacture of the rotor 3, the insulating layer 13 is formed at the outer edge side portion among the slots 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 a circle centered on the rotation axis AX among the slots 10.
The driving efficiency of the induction motor 1 is reduced due to the coupling of the harmonic magnetic flux with the conductor 11. The harmonic magnetic flux is generated by flowing a current of harmonic components, which are components of a frequency higher than the driving frequency of the rotor 3, through the rotor core 9. Since the harmonic magnetic flux passes through only the outer edge portion of the rotor core 9, cross flow is less likely to occur in the outer edge side portion among the slots 10. By forming the insulating layer 13 on the outer edge portion of the slot 10, the induction motor 1 can suppress occurrence of cross flow, and the driving efficiency can be improved.
According to embodiment 3, the application of the insulating paint to the portion of the slot 10 on the side of the rotation axis AX is not required, and thus the amount of insulating paint used in the manufacture of the rotor 3 can be reduced.
Embodiment 4.
Fig. 10 is an oblique view showing a part of a rotor core included in the induction motor according to embodiment 4. In embodiment 4, the insulating layer 13 is provided in the center portion in the axial direction in the slot 10 as in embodiment 2, and is provided in the outer edge side portion in the slot 10 as in embodiment 3. In embodiment 4, the same reference numerals are given to the same constituent elements as those in embodiments 1 to 3, and the configuration different from those in embodiments 1 to 3 will be mainly described. In fig. 10 an insulating layer 13 is shown arranged in 1 slot 10.
The length L of the insulating layer 13 in the axial direction is greater than or equal to 85% of the 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 process of forming the insulating layer 13, the insulating layer 13 is formed in a range of at least 85% of the entire length L of the slot 10 at the center portion in the axial direction among the slots 10 at the time of manufacturing the rotor 3.
The length H of the insulating layer 13 in the radial direction of the circle centered on the rotation axis AX is greater than or equal to 60% of the length H of the slot 10 in the radial direction. The insulating layer 13 is not provided at the portion of the slot 10 on the side of the rotation axis AX. In the process of forming the insulating layer, the insulating layer 13 is formed at the outer edge side portion among the slots 10 at the time of manufacturing the rotor 3. The insulating layer 13 is formed in a range of at least 60% relative 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 cases of embodiments 2 and 3, the amount of insulating paint used in manufacturing 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 thereby the production efficiency of the rotor 3 can be improved.
Embodiment 5.
Fig. 11 is an oblique view showing a rotor core of an induction motor according to embodiment 5. In embodiment 5, insulating layers 13 are provided for every 1 slot 10 in the circumferential direction of a circle centered on the rotation axis AX among the plurality of slots 10 provided in the rotor core 9. In embodiment 5, the same reference numerals are given to the same components as those in embodiments 1 to 4 described above, and mainly the different configurations from those in embodiments 1 to 4 will be described.
In the rotor core 9, the slots 10 provided with the insulating layers 13 and the slots 10 not provided with the insulating layers 13 are alternately arranged in the circumferential direction. The insulating layer 13 is provided on the entire inner peripheral surface of the slot 10 as in embodiment 1. In the process of forming the insulating layer 13, the insulating layer 13 is formed every 1 slot 10 in the circumferential direction in the process of manufacturing the rotor 3. The insulating layer 13 may be provided in the same manner as in embodiment 2, 3, or 4.
The cross flow mainly occurs between the conductors 11 of the slots 10 adjacent to each other. Therefore, even if the insulating layers 13 are provided every 1 slot 10 in the circumferential direction, the occurrence of cross flow in the rotor core 9 can be reduced. The induction motor 1 can suppress occurrence of cross flow and can improve driving efficiency.
According to embodiment 5, the amount of insulating paint used in manufacturing the rotor 3 can be reduced by eliminating the need for coating insulating paint on a part of the plurality of slots 10.
Embodiment 6.
In embodiment 6, a method of manufacturing a cage rotor will be described. Fig. 12 is a flowchart showing a procedure of a method for manufacturing a cage rotor according to embodiment 6. The method for manufacturing a cage rotor according to embodiment 6 includes steps S1 to S5. Step S1 is a step of assembling rotor core 9. Step S2 is a step of spraying an insulating paint. Step S3 is a drying and hardening step of the insulating paint. Step S4 is an aluminum die casting process. Step S5 is a post-processing step.
In the assembling process of the rotor core 9, the rotor core 9 is assembled by overlapping the plurality of steel plates 9a that are released from the mold. The steel plates 9a are displaced by a predetermined length in the circumferential direction of a circle centered on the rotation axis AX, and a plurality of steel plates 9a are stacked.
In the step of spraying the insulating paint, the insulating paint is prepared by mixing and stirring at least one silicone resin selected from a silicone resin having a methylphenyl group, a silicone resin modified with 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 inorganic compound particles may be dispersed in aggregate particles, and the material of the insulating paint may be mixed and stirred by a method generally used in the technical field of rotor manufacturing. For the mixing and stirring, for example, a general rotation-revolution stirrer, a high-pressure shear dispersing device, a homogenizer, a high-speed stirrer, or the like can be used.
Next, the insulating paint thus produced is sprayed onto the rotor core 9 by using a sprayer. The insulating paint is sprayed from the upper surface side of the rotor core 9 among the slots 10 toward the inside of the slots 10, whereby the insulating paint is applied to the inner peripheral surfaces of the slots 10. In order to adjust the thickness of the insulating paint on the inner peripheral surface, the amount of the insulating paint to be sprayed is adjusted so that excessive or insufficient amount of the insulating paint to be sprayed does not occur. In order to spray an appropriate amount of insulating paint, the time for spraying the insulating paint is accurately controlled.
When the time for spraying the insulating paint is too long, the amount of the insulating paint sprayed becomes excessive, and thus the thickness of the insulating paint on the inner peripheral surface may become excessive. In addition, a part of the sprayed insulating paint sometimes drops from the slot 10. The insulating paint may infiltrate into the interior of the rotor core 9. When the time for spraying the insulating paint is too short, the amount of the insulating paint sprayed is insufficient, and thus the thickness of the insulating paint on the inner peripheral surface may be insufficient. In addition, the thickness of the insulating coating material covering the inner peripheral surface may not be uniform by preventing the insulating coating material from diffusing on the inner peripheral surface.
In the insulating paint spraying step, insulating paint is applied to the inner peripheral surface of the slot 10. The insulating paint can be applied by spraying in a limited range in which the insulating layer 13 is formed. In the case of spraying, the problem of the insulating paint being applied to the portion where the insulating layer 13 is not required can be avoided, as compared with the case of dipping the insulating paint into the rotor core 9. In addition, if compared with the case where the rotor core 9 is impregnated with the insulating paint, the problem of contamination of the insulating paint with impurities adhering to the rotor core 9 can be avoided in the case of painting.
The step of drying and curing the insulating paint includes a step 1 of drying the insulating paint at room temperature and a step 2 of heating the insulating paint in a furnace. In step 1, the rotor core 9 coated with the insulating paint is left at room temperature for about 1 hour, whereby the volatile components contained in the diluting solvent are vaporized. If the curing by heating is performed without the step 1, vaporization of the volatile component and curing of the silicone resin are performed simultaneously, and thus bubbles may be generated on the surface and inside of the insulating coating. The bubbles become a factor for reducing insulation resistance, and therefore it is necessary to gasify the volatile components before hardening.
In step 2, the rotor core 9 after the drying of the insulating paint is heated in a furnace, whereby the silicone resin having a methylphenyl group is cured. The heating temperature and heating time may be any degree as long as the curing of the silicone resin can be completed and the silicone resin is not degraded. In embodiment 6, the silicone resin is cured by heating at 250 ℃ for 2 hours in step 2. When the heating temperature is too low or the heating time is too short, hardening becomes insufficient, and the insulating coating may not be cured. In the case where the heating temperature is too high or in the case where the heating time is too long, the silicone resin is deteriorated, whereby the insulating performance of the insulating layer 13 may be lowered.
In the aluminum die casting process, aluminum is cast into the slot 10 in which the insulating layer 13 is formed, thereby forming the conductor 11. The aluminum die casting process is performed by a method generally used in the technical field of rotor manufacturing.
In the post-processing step, the rotor core 9 on which the conductors 11 are formed in the shaft 4 is thermally assembled 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 method for manufacturing a cage rotor 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 paint manufactured by the respective conditions shown in examples 1 to 20 and comparative examples 1 to 8 will be described. The stray load loss represents the stray load loss of the rotor 3 due to occurrence of cross flow in the rotor core 9. Sprayability means the property that a film of insulating paint of an appropriate thickness can be formed by spraying of the insulating paint.
In fig. 13, respective conditions concerning the material and viscosity of the insulating paint are shown with respect to examples 1 to 20 and comparative examples 1 to 8, respectively. In example 1, as the silicone resin, a silicone resin having a methylphenyl group and a silicone resin modified with an alkyd resin were used. In fig. 13, "methylphenyl" means a silicone resin having methylphenyl groups. In fig. 13, "alkyd" means a silicone resin modified by an alkyd resin.
In example 1, the specific surface area of the inorganic compound particles, i.e., 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 material other than the diluting solvent was 35wt%. In example 1, the diluent solvent was a mixed solvent of xylene and toluene. In example 1, the viscosity of the insulating coating material was 15 mPas.
In examples 2 to 20 and comparative examples 1 to 8, at least 1 of the conditions concerning 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 that of example 1.
In fig. 13, the effects of reducing the stray load loss and the evaluation results concerning each item of sprayability and the comprehensive evaluation of each item are shown with respect to examples 1 to 20 and comparative examples 1 to 8, respectively. The evaluation and the comprehensive evaluation for each item are represented by 4 items "a", "B", "C" and "D", respectively. "A" represents the highest evaluation among 4 of "A", "B", "C" and "D". The evaluation was decreased in the order "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 paint is not applied. In sprayability, "D" indicates that spraying is not possible.
The comprehensive evaluation represents a relative evaluation based on example 1 and comparative example 1. The "a" of the overall evaluation indicates an evaluation equivalent to that of example 1 or an evaluation higher than that of example 1. The "B" and "C" of the overall evaluation represent higher than comparative example 1 and lower than example 1. The "D" of the overall evaluation indicates failure, i.e., inability to use in the manufacture of the rotor 3.
The action and effect of the aggregated particles 14 having a diameter in the range of 0.5 μm to 20 μm can be explained by comparing examples 1 to 3, 15 to 20 with comparative examples 1, 2, 7, 8. For example, the particle diameters of examples 1-3 were 10 μm, 15 μm and 20 μm, respectively, and all were included in the range of 0.5 μm to 20. Mu.m. In contrast, the particle diameters of comparative examples 1, 2, 7 and 8 were 0.3 μm, 27 μm, 35 μm and 0.4 μm, respectively, and were not included in the range of 0.5 μm to 20. Mu.m.
Depending on the height of the dielectric breakdown voltage of the aggregate particles 14, the aggregate particles 14 have a function of improving the dielectric breakdown voltage of the entire insulating layer 13. The aggregate particles 14 also function as spacers for providing the insulating layer 13 with a thickness for obtaining a desired dielectric breakdown voltage. In the case of comparative examples 1 and 8, the particle diameter is smaller than 0.5 μm, and thus the insulating layer 13 having a thickness for obtaining a desired dielectric breakdown voltage cannot be formed. In the case of comparative example 2, the particle diameter exceeds 20 μm, and thus the aggregated particles 14 are liable to settle in the liquid, i.e., the insulating coating. Therefore, it is difficult to uniformly disperse the aggregated particles 14 on the inner peripheral surface of the slot 10 to spray the insulating paint.
In contrast, in examples 1 to 3 and 15 to 20, the particle diameter is in the range of 0.5 μm to 20 μm in any case, whereby sedimentation of the aggregated particles 14 in the insulating paint can be reduced, and thus the aggregated particles 14 can be uniformly dispersed to spray the insulating paint. In addition, the insulating layer 13 having a thickness for obtaining a desired insulation withstand voltage can be formed. Therefore, in examples 1-3 and 15-20, the effect of reducing the stray load loss becomes high.
The specific surface area of the inorganic compound particles, i.e., primary particles, is contained in 0.5m 2 /g to 20m 2 The action and effect caused by 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 Per g, all contained in 0.5m 2 /g to 20m 2 The range of/g. In contrast, the specific surface areas in comparative examples 1 and 2 were 100m, respectively 2 /g、0.3m 2 Per g, none of which is contained in 0.5m 2 /g to 20m 2 The range of/g.
If the specific surface area of the primary particles is changed, the surface area for the same mass is changed, and thus the influence of the effect of the surface of the primary particles is changed. Thus, the specific surface area of the primary particles affects the manner in which the primary particles self-aggregate. 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 thus the smaller the diameter of the aggregated particles 14 obtained by self-aggregation of the primary particles becomes. In the case of comparative example 1, the specific surface area exceeded 20m 2 Per gram, the diameter of the agglomerate grains 14 is 0.3. Mu.m. In this case, the diameter of the aggregated particles 14 is less than 0.5 μm, and thus 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 And the diameter of the aggregated particles 14 was 27. Mu.m. In this case, the diameter of the aggregated particles 14 exceeds 20 μm, and thus the aggregated particles 14 are likely to settle in the liquid, i.e., the insulating coating.
In contrast, in examples 17 to 20, the specific surface area was contained in 0.5m in any case 2 /g to 20m 2 The range of/g, whereby the diameter of the aggregated particles 14 obtained by self-aggregation of the primary particles is contained in the 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 the primary particles. Has the property of self-aggregation of primary particles, and thus the aggregated particles 14 can be obtained without using an aggregating agent. Since no aggregating agent is usedThe process of coating the aggregating agent is not required, and the productivity of the cage rotor can be improved. Therefore, in embodiments 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 contained in the range of 30 to 40wt% can be explained by comparison of examples 4, 5 and comparative examples 3, 4. The concentration of the aggregated particles 14 in examples 4 and 5 was 30wt% and 40wt%, respectively, and was included in the range of 30wt% to 40 wt%. In contrast, the concentrations of the aggregated particles 14 in comparative examples 3 and 4 were 20wt% and 50wt%, respectively, and were not included in the range of 30wt% to 40 wt%.
In general, the inorganic compound particles have a higher dielectric breakdown voltage than the organic compound particles. Here, the organic compound is a silicone resin having a methylphenyl group. In order to improve the dielectric strength, the inorganic compound particles are filled with an organic compound. In the composite of the organic compound and the inorganic compound, the more 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 is less than 30wt%, and thus the dielectric breakdown voltage of the composite, i.e., the insulating layer 13, cannot be improved. As a result, in comparative example 3, the effect of reducing the stray load loss was reduced. In addition, in the composite of the organic compound and the inorganic compound, the more 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 exceeds 40wt%, and thus the viscosity of the composite, i.e., the insulating coating becomes high. In comparative example 4, the spraying of the insulating paint 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, to a range of 30wt% to 40wt%, whereby the improvement of the dielectric breakdown voltage of the insulating layer 13 and the suppression of the increase in viscosity of the insulating paint could be achieved. Thus, in examples 4 and 5, the effect of reducing the stray load loss is improved, and the reduction in the sprayability can be suppressed.
The action and effect of the insulating paint, which are caused by the viscosity of the paint being in the range of 10 mPas to 1000 mPas, can be illustrated by comparing examples 6 to 14 with comparative examples 5 and 6. In the present invention, the insulating paint is applied by spraying, so that the insulating paint can be easily applied, and the insulating paint can be applied only to a desired range. The application properties of the spray coating and the viscosity of the insulating coating are related to the adhesion. If the viscosity of the insulating paint is too high, spraying of the insulating paint by the air pressure of the atomizer becomes difficult. In addition, if the viscosity of the insulating paint is too low, the insulating paint flows down from the slot 10 between the time when the insulating paint is sprayed and the time when the insulating paint is cured, and thus it is difficult to make the insulating layer 13 have a thickness for obtaining a high insulation withstand voltage.
The viscosities of 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 all were included 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 mPas to 1000 mPas.
In the case of comparative example 5, since the viscosity of the insulating paint is less than 10mpa·s, the insulating layer 13 cannot be made to have a thickness for obtaining a high insulation withstand voltage. In the case of comparative example 6, the viscosity of the insulating paint exceeded 1000mpa·s, and therefore the insulating paint could not be sprayed.
In contrast, in examples 6 to 14, the viscosity was in the range of 10mpa·s to 1000mpa·s in any case, and thus the insulating layer 13 could have a thickness for obtaining a high dielectric breakdown voltage, and the insulating paint could be applied. As described above, the effect of reducing the parasitic load loss is obtained when the viscosity is included in the range of 10mpa·s to 1000mpa·s. Further, as a result of intensive studies, it was confirmed that the effect of reducing the parasitic load loss was higher when the viscosity was included in the range of 10mpa·s to 60mpa·s, and was highest when the viscosity was included in the range of 10mpa·s to 20mpa·s.
The configuration shown in the above embodiments shows an example of the content of the present invention. The structure of each embodiment can be combined with other known techniques. The structures of the respective embodiments may be appropriately combined with each other. A part of the structure of each embodiment may be omitted or changed without departing from the scope of the present invention.
Description of the reference numerals
An induction motor 1, a stator 2, a rotor 3, a shaft 4, a housing 5, a frame 6, a bottom 6a, an end plate 7, a bearing 8, a rotor core 9, a steel plate 9a, a slot 10, a hole 10a, a conductor 11, a shorting ring 12, an insulating layer 13, a particulate collection 14, and an AX rotation shaft.
Claims (14)
1. A method of manufacturing a cage rotor, the cage rotor comprising: a rotor core which is a laminate of a plurality of steel plates; and conductors which are respectively accommodated in a plurality of slots arranged in the rotor core in the circumferential direction of a circle centering around the rotation axis,
the manufacturing method of the cage rotor is characterized in that,
comprises a step of forming an insulating layer in the slots by applying an insulating paint to the inner peripheral surfaces of the slots included in the plurality of slots,
the insulating paint is prepared by mixing at least one silicone resin from among silicone resins having methylphenyl groups and silicone resins modified by alkyd resins, aggregated particles of inorganic compound particles having a property of self-aggregation of primary particles, and a diluting solvent,
in the step of forming the insulating layer, the insulating layer is formed at every 1 slot in the circumferential direction among the plurality of slots.
2. A method for manufacturing a cage rotor according to claim 1, wherein,
the specific surface area of the primary particles is contained in a range of from 0.5m 2 /g to 20m 2 The range of/g.
3. A method for manufacturing a cage rotor according to claim 1 or 2, characterized in that,
in the step of forming the insulating layer, the insulating paint is applied while being limited to the inner peripheral surface.
4. A method for manufacturing a cage rotor according to any one of claims 1 to 3,
in the step of forming the insulating layer, the insulating paint is applied by spraying.
5. A method for manufacturing a cage rotor as claimed in any one of claims 1 to 4,
the plurality of steel plates are each of the same shape, and the plurality of steel plates are stacked by displacing the shape by a predetermined length in the circumferential direction for each of the plurality of steel plates, whereby the plurality of slots are each inclined with respect to the rotation axis,
the aggregate particles have a diameter shorter than the length and shorter than the thickness of each of the plurality of steel plates in the direction of the rotation axis.
6. A method for manufacturing a cage rotor according to any one of claims 1 to 5,
The aggregated particles are aggregates of the primary particles contained in a diameter ranging from 0.1 μm to 5 μm,
the diameter of the aggregated particles is comprised in the range from 0.5 μm to 20 μm.
7. A method for manufacturing a cage rotor according to any one of claims 1 to 6,
the concentration of the aggregated particles in the insulating paint other than the diluting solvent is contained in a range from 30wt% to 40 wt%.
8. A method for manufacturing a cage rotor according to any one of claims 1 to 7,
the viscosity of the insulating paint is contained in a range from 10 mPas to 1000 mPas.
9. A method for manufacturing a cage rotor according to any one 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% over a whole length of the slot in a direction of the rotation axis, at a central portion in the direction of the rotation axis among the slots.
10. A method for manufacturing a cage rotor according to any one 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 of the rotation axis.
11. The method of manufacturing a cage rotor according to claim 10, wherein,
the insulating layer is formed in a range of at least 60% of the length of the slot in a radial direction with respect to a circle centered on the rotation axis among the slots.
12. A cage rotor is characterized in that,
the device comprises:
a rotor core which is a laminate of a plurality of steel plates;
conductors which are respectively accommodated in a plurality of slots arranged in the rotor core in the circumferential direction of a circle centering on the rotation axis; and
an insulating layer provided on the inner peripheral surfaces of the slots included in the plurality of slots,
at least one silicone resin among silicone resins having a methylphenyl group and silicone resins modified by an alkyd resin and aggregated particles of inorganic compound particles having a property of self-aggregation of primary particles are mixed in the insulating layer,
the insulating layers are provided at every 1 slot in the circumferential direction among the plurality of slots, respectively.
13. The cage rotor of claim 12 wherein the cage rotor is formed from a material selected from the group consisting of,
the specific surface area of the primary particles is contained in a range of from 0.5m 2 /g to 20m 2 The range of/g.
14. Cage rotor according to claim 12 or 13, characterized in that,
The insulating layer is provided so as to be limited to the inner peripheral 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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| Publication Number | Publication Date |
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| CN115516744A CN115516744A (en) | 2022-12-23 |
| CN115516744B true CN115516744B (en) | 2023-07-21 |
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| CN202080100435.7A Active CN115516744B (en) | 2020-05-15 | 2020-05-15 | Method for manufacturing cage rotor and cage rotor |
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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 |
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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 |
| 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 |
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| 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 |
|---|---|
| CN115516744A (en) | 2022-12-23 |
| JPWO2021229807A1 (en) | 2021-11-18 |
| JP6877657B1 (en) | 2021-05-26 |
| WO2021229807A1 (en) | 2021-11-18 |
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