JPH0783576B2 - Method of manufacturing induction motor rotor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing an induction motor rotor, and in particular,
For example, the present invention relates to a method for manufacturing an induction motor rotor having a small magnetic permeability and a large radial magnetic permeability, which is suitable for a rotor of an induction motor for a hermetic electric compressor.

[Prior Art] A conventional method for manufacturing a rotor of an induction motor is disclosed in JP-A-57-71.
As described in Japanese Patent No. 254, a laminate of magnetic iron plates provided with a plurality of radially extending teeth on the outer peripheral part is formed by laminating the positions of the teeth in the circumferential direction and forming a gap between the plurality of teeth. It was supposed to be cast into a conductor.

[Problems to be Solved by the Invention] The above conventional technique will be described with reference to FIGS. 11 to 14.

FIG. 11 is a perspective view showing a main part of a conventional induction motor rotor described in JP-A-57-71254, and FIG. 12 is a perspective view showing a method of attaching a counterweight to the rotor shown in FIG. , FIG. 13 is a sectional view taken along the line AA of FIG. 12, and FIG. 14 is
It is a perspective view of the magnetic iron plate of the conventional rotor.

The rotor shown in FIG. 11 is formed by stacking magnetic iron plates 10 (see FIG. 14) having a plurality of radially extending teeth 10a on the outer peripheral portion and shifting the positions of the teeth 10a in the circumferential direction. The conductor 11 is cast in the gap between the plurality of teeth. When this rotor is used for a hermetic electric compressor, as shown in FIG. 12, a counterweight 12 that balances the rotating eccentric weight (not shown) of the compression mechanism portion of the hermetic electric compressor is fixed with bolts 13 It was screwed in and used.

With such a structure, as shown in FIG. 13, since the bolt crosses the teeth 10a of the laminated magnetic iron plate 10, magnetic flux flows through the bolt toward the end face of the rotor,
No consideration was given to reducing the torque and efficiency of the electric motor.

Further, in the conventional rotor structure, as shown in FIG. 14, the shape of the magnetic iron plate 10 is a flat plate. There was a problem that it was difficult for the molten metal to flow.

Furthermore, in the conventional rotor structure, since the conductor 11 is cast only by shifting the positions of the teeth 10a and stacking the teeth, the position of the teeth of the magnetic iron plate relative to each other due to the pressure of the molten metal at the time of casting. However, there is a problem that the tip of the tooth sticks to the adjacent tip of the tooth, and because of this, the hot water does not fill the gap between the teeth and a pinhole is formed.

The present invention has been made in order to solve the above-mentioned problems of the prior art, is a high performance that can maximize the characteristics of the rotor having a small magnetic permeability in the circumferential direction and a large magnetic permeability in the radial direction, and It is an object of the present invention to provide a method for manufacturing an induction motor rotor with good productivity.

[Means for Solving the Problems] In order to achieve the above object, in the method for manufacturing an induction motor rotor according to the present invention, an outer peripheral portion of a magnetic iron plate having a hole for fitting into a rotating shaft in a central portion is provided. , Provided with a plurality of radially extending teeth, after twisting the plurality of teeth at a constant angle with respect to the non-tooth portion, the position of the tooth in the circumferential direction so that the tip of the tooth does not contact the adjacent tooth tip. A stack is formed by sequentially stacking them while shifting them, and a stack is formed on the stack.
Forming a ring serving as a passage for an induced current located at the lower end and a counterweight for balancing the eccentric weight, simultaneously with filling the gap portion of the plurality of teeth, integrally, by an aluminum die cast method. There is.

It should be noted that, in the laminated body, the semi-blanked protrusions provided on the magnetic iron plate are sequentially inserted into the recesses of the adjacent magnetic iron plates,
It is formed by crimping the entire laminated body by pressing while laminating.

[Operation] The operation of the above technical means is as follows.

First, since the counterweight is integrally formed with the aluminum die cast method at the same time as filling the tooth gaps of the magnetic iron plate, it is not necessary to tighten a separate component with a bolt as in the prior art, and the torque and efficiency of the bolt are reduced. There is no problem.

In addition, since the rings serving as the passage of the induced current are integrally formed at the upper and lower ends of the rotor by the aluminum die cast method, the secondary resistance of the induction motor is small and a large torque can be generated.

In addition, since the teeth of the magnetic iron plate are twisted, the molten metal at the time of casting easily flows, improving productivity and increasing the flow area of the induced current to reduce the secondary resistance of the conductor.
This has the effect of easily generating a large torque.

Also, while stacking the magnetic iron plates, by pressing the half-blanked protrusions provided on the magnetic iron plates into the recesses of the adjacent iron plates sequentially and caulking, the teeth of the magnetic iron plates may be misaligned during casting. Absent.

As described above, according to the present invention, a highly efficient rotor with high torque and high performance can be manufactured, and at the same time, a counter weight is integrally formed by using a highly productive manufacturing method such as a press and die cast method. The rotor of the induction motor can be obtained.

[Embodiment] Each embodiment of the present invention will be described below with reference to FIGS. 1 to 10.

FIG. 1 is an elevation view of an induction motor rotor according to an embodiment of the present invention, FIG. 2 is a plan view of the rotor of FIG. 1, and FIG. 3 is a partial cross section showing a crimping portion thereof. Fig. 4 is a plan view of the magnetic iron plate, Fig. 5 is a schematic plan view showing a state where the teeth of the magnetic iron plate are twisted, and Fig. 6 is an iron core of the rotor of Fig. 1. FIG. 3 is a partial elevational view showing a part of FIG.

1 and 2, 1 is a thin magnetic iron plate 6
It is a rotor core formed by stacking (see FIG. 4).

Reference numeral 2 is a ring provided on the upper and lower ends of the rotor core 1 and serving as a passage for an induced current, and 3 is an eccentric weight for rotating the compression mechanism, for example, when the rotor is applied to a hermetic electric compressor. It is a counterweight that balances with. 4 is
It is a hole for fitting the rotor into the rotating shaft.

Reference numeral 5 denotes a caulking portion, and as shown in FIG. 3, pressing the magnetic iron plates 6 while laminating the magnetic iron plates 6 causes the semi-blanked protrusions 7 provided on the magnetic iron plates 6 to be recessed in the adjacent magnetic iron plates. By sequentially inserting, the whole laminated body is caulked.

4 to 6 show a method of manufacturing the rotor iron core 1. First, as shown in FIG. 4, the magnetic iron plate 6 is provided with a hole in the center for inserting the magnetic iron plate 6 into the outer circumference. Punching with a press so as to have a plurality of teeth 6a extending radially toward the part, and then as shown in FIGS. 5 and 6, the teeth 6a are twisted at a certain angle α with respect to the non-tooth portion 6b. After bending, the teeth 6a are sequentially laminated one by one by shifting the positions of the teeth 6a one by one in the circumferential direction so that the tips of the teeth 6a do not come into contact with the adjacent tooth tips.

The rotor laminated body manufactured in this manner further comprises the ring 2 and the counterweight 3, which are located on the upper and lower ends of the laminated body, integrated with each other at the same time as filling the gap portions 8 of the plurality of teeth by the aluminum die casting method. It is formed by casting.

In the rotor thus formed, magnetic flux flows through the teeth 6a extending radially on the outer periphery, so that the magnetic permeability in the circumferential direction is small and the magnetic permeability in the radial direction is large.

The induced current flows through the aluminum filled in the tooth gaps 8 and circulates through the upper and lower rings 2 to form a large number of closed current circuits.

Due to these effects, not only a rotor with good performance can be obtained, but also the counterweight 3 can be molded at the same time, so that the productivity is good.

If the casting work is performed by the low pressure casting method of aluminum instead of the aluminum die cast method, a good quality conductor without pinholes can be obtained without impairing the productivity. The same applies when the aluminum high pressure casting method is used.

Next, FIG. 7 is an elevation view of an induction motor rotor according to another embodiment of the present invention, and FIG. 8 is a partial elevation view showing a part of the iron core of the rotor of FIG. . In the figure, those having the same reference numerals as those in FIGS. 1 and 6 are the same parts as those in the previous embodiment, and therefore their explanations are omitted.

The rotor iron core 1A is a magnetic iron plate 6 punched out by a press so as to have a plurality of teeth 6A extending radially toward the outer peripheral portion.
Is bent and formed by twisting a certain angle α ′ with respect to the non-tooth portion in a state where two teeth 6A are overlapped, and the teeth 6A are contacted so that the tips thereof do not come into contact with the adjacent tooth tips. The 6A positions are stacked one on top of the other while sequentially shifting the two sheets while the two sheets overlap.

The rotor core 1A formed in this way can have more space around the teeth 6A even if it has the same tooth profile, as compared with one formed by twisting one by one and sequentially laminating it, so that the flow of molten metal is good and the pinhole is good. It is difficult to do Further, the twisting angle of the teeth 6A can be made larger than that of twisting one by one, so that an induced current flowing upward and downward of the ring 2 can easily flow.

Next, FIG. 9 is an elevation view of an induction motor rotor according to still another embodiment of the present invention, and FIG. 10 is a partial elevation view showing a part of the iron core of the rotor of FIG. is there. In the figure, those having the same reference numerals as those in FIGS. 1 and 6 are the same parts as those in the previous embodiment, and therefore their explanations are omitted.

The rotor iron core 1B is a magnetic iron plate 6 punched by a press so as to have a plurality of teeth 6B radially extending toward the outer peripheral portion.
Is bent and formed by twisting a certain angle α ″ with respect to the non-tooth portion in a state where three teeth 6B are piled up, and then the teeth 6B are prevented from coming into contact with adjacent tooth tips. The 6B position is sequentially shifted while the three sheets are overlapped, and the layers are laminated while caulking.

The rotor core 1B formed in this way can have more space around the teeth 6B even if it has the same tooth profile, as compared with a structure in which one or two teeth are twisted and sequentially laminated, so that the flow of molten metal can be increased. It is good and it is hard to make pinholes. Furthermore, since the twist angle of the tooth 6B can be made larger than that of twisting one or two teeth, the ring 2 is
The effect is that the induced current flowing downward easily flows.

[Advantages of the Invention] As described above, according to the present invention, high performance and high productivity capable of maximizing the characteristics of a rotor having a small magnetic permeability in the circumferential direction and a large magnetic permeability in the radial direction are provided. A good method of manufacturing a rotor of an induction motor can be provided.

[Brief description of drawings]

FIG. 1 is an elevation view of a rotor of an induction motor according to an embodiment of the present invention, FIG. 2 is a plan view of the rotor of FIG. 1, and FIG. 3 is a portion showing a crimping portion thereof. A sectional view, FIG. 4 is a plan view of the magnetic iron plate, FIG. 5 is a schematic plan view showing a state where the teeth of the magnetic iron plate are twisted, and FIG. 6 is a plan view of the rotor of FIG. FIG. 7 is a partial elevational view showing a part of the iron core, FIG. 7 is an elevational view of an induction motor rotor according to another embodiment of the present invention, and FIG. 8 is a part of the iron core of the rotor of FIG. FIG. 9 is a partial elevation view showing an induction motor rotor according to still another embodiment of the present invention, and FIG. 10 is a portion showing a part of the iron core of the rotor shown in FIG. FIG. 11 is an elevational view, FIG. 11 is a perspective view of a main part of a conventional induction motor rotor, FIG. 12 is a perspective view showing a method of attaching a counterweight to the rotor of FIG. 11, and FIG.
FIG. 14 is a cross-sectional view taken along the line AA of FIG. 14, and FIG. 14 is a perspective view of a magnetic iron plate of a conventional rotor. 1,1A, 1B …… Rotor core, 2 …… Ring, 3 …… Counterweight, 4 …… Hole, 5 …… Clamping part, 6 …… Magnetic iron plate, 6a, 6A, 6B …… Tooth, 6b ...... Non-tooth part, 7 ... protrusion, 8 ... gap part.

Claims (6)

[Claims] 1. A plurality of radially extending teeth are provided on an outer peripheral portion of a magnetic iron plate having a hole for fitting in a rotary shaft at a central portion, and the plurality of teeth are twisted at a constant angle with respect to a non-tooth portion. After that, the teeth are displaced in the circumferential direction so that the tips of the teeth do not come into contact with the adjacent tips, and the teeth are sequentially laminated to form a laminated body, and the laminated body is formed on the upper and lower ends of the laminated body. To form a ring that serves as a passage for the induced current and a counterweight for balancing the eccentric weight,
A method for manufacturing an induction motor rotor, characterized in that it is carried out integrally by filling the gaps of the plurality of teeth with an aluminum die cast method at the same time. 2. The method according to claim 1, wherein the laminated body is laminated by pressing while inserting half-blanked protrusions provided on the magnetic iron plate into concave portions of adjacent magnetic iron plates in sequence. A method for manufacturing an induction motor rotor, characterized by forming the whole body by crimping. 3. The method of manufacturing an induction motor rotor according to claim 1, wherein the casting method is a low pressure casting method of aluminum. 4. The method of manufacturing an induction motor rotor according to claim 1, wherein the casting method is a high pressure casting method of aluminum. 5. The method according to any one of claims 1 to 4, wherein a plurality of teeth are twisted at a certain angle with respect to a non-tooth portion in a state where two magnetic iron plates are stacked. A method for manufacturing an induction motor rotor, wherein the positions of the teeth are sequentially shifted and stacked so that the teeth do not come into contact with the tips of the adjacent teeth. 6. The method according to any one of claims 1 to 4, wherein three magnetic iron plates are stacked,
After twisting a plurality of teeth at a certain angle with respect to the non-tooth portion, the tips of the teeth do not come into contact with the adjacent tooth tips,
A method of manufacturing an induction motor rotor, comprising stacking three teeth in a state where the teeth are overlapped one after another.