KR102246438B1 - Rotor structure of induction motor and manufacturing method for thereof - Google Patents

Abstract

The present invention makes it possible to easily set the target efficiency and starting torque of the induction motor, and it is possible to manufacture steel plates with slots of different shapes using a minimum number of molds, thereby improving economic efficiency. It relates to an electronic structure and a method of manufacturing the same.

Description

Rotor structure of induction motor and manufacturing method for thereof

The present invention relates to a rotor structure of an induction motor and a method of manufacturing the same.

An induction motor is a typical AC motor, and an induction current is generated in the rotor of an electric conductor by a rotating magnetic field created by the stator to generate rotational torque corresponding to slippage. Induction motors are used in household appliances such as washing machines, air conditioners, refrigerators, electric and hybrid vehicles, ISG (Idle Stop&Go), electric compressors, and automotive electronics such as EPS. And other various industrial fields.

A rotor core is used in an induction motor, and FIGS. 1 and 2 schematically show cross-sections of two types of rotor cores in the related art. The rotor core shown in FIG. 1 is a cage type, and the rotor core shown in FIG. 2 is a double cage type. 1 and 2, the rotor core 10 is formed by stacking a plurality of steel plates 11, and slots 12 having a predetermined shape are formed in each of the steel plates 11. Conductor bars 20 and 30 are formed in each of the conductor slots 12, and the shapes of the conductor bar 20 of the squirrel cage rotor core and the conductor bar 30 of the double squirrel cage rotor core are different from each other.

More specifically, the conductor bar 30 of the double squirrel cage rotor core shown in FIG. 2 is divided into a working bar 31 and a starting bar 32. When the induction motor is started, since the slip increases and the leakage inductance becomes much larger than the resistance, the current of the rotor is limited by the leakage inductance of the working bar 31 and is concentrated to the starting bar 32. On the contrary, in the driving range of the induction motor, the slip is small and the specific gravity of the resistance increases, and the rotor current is concentrated in the working bar 31. That is, when the induction motor is started, the rotor resistance of the double squirrel cage shown in FIG. 2 becomes larger than the rotor resistance of the squirrel cage shown in FIG. 1. Since the induction motor has a trade-off characteristic in which the rotor resistance and the starting torque are inversely proportional to each other, when the efficiency of the induction motor (motor) is emphasized, the squirrel cage rotor core shown in Fig. 1 and a relatively high starting torque are required. In this case, the double squirrel cage rotor core shown in FIG. 2 is used. In general, since the shape of the rotor is manufactured according to the performance of the motor, the shape of the rotor core is different for each motor, and when the shape of the rotor core is fixed, the rotor resistance also does not change. In other words, in the case of using a conventional squirrel cage or double squirrel cage rotor core, it was not easy to set the characteristics of the induction motor to the desired shape. There is a problem that it is necessary and economical efficiency is lowered, and mass production is difficult.

Korean Patent Application Publication No. 10-2006-0027707 ("Squirrel cage rotor of an induction motor and its manufacturing method", Publication date 2006.03.28.)

The present invention was conceived to solve the above problems, and an object of the rotor structure of an induction motor and a method of manufacturing the same according to the present invention is to facilitate the setting of the target efficiency and starting torque of the induction motor. It is to provide a rotor structure of an induction motor and a method of manufacturing the same, which can improve economic efficiency by making it possible to manufacture steel plates having slots of different shapes using a minimum number of molds.

The rotor structure of the induction motor according to the present invention for solving the above-described problems includes: a core composed of a plurality of steel plates having slots formed therethrough being stacked on one side; And a conductor bar formed in an insertion space formed by connecting the slots formed in the steel plates, wherein the steel plate includes a first steel plate through which a first slot is formed and a second slot having a different shape from the first slot. It characterized in that it is composed of a second steel plate formed through.

In addition, the first steel plate and the second steel plate is characterized in that it is alternately laminated in a predetermined pattern.

In addition, a plurality of the slots are formed radially with respect to the center of the steel plate, and a single slot includes an inner space positioned in the center direction of the steel plate and an outer space positioned outside the steel plate.

In addition, the outer space of the first slot is different from the outer space of the second slot.

In addition, the outer space of the first slot is characterized in that a certain portion is removed from the outer space of the second slot.

In addition, the single conductor bar is characterized in that it is made of different metals.

In addition, the conductor bar is characterized in that it comprises a working bar formed of a first metal and a starting bar connected to the working bar and formed of a second metal different from the first metal. .

In addition, the first metal is copper, and the second metal is aluminum.

In addition, at least a portion of the working bar is characterized in that located in the central portion of the steel plate than the starting bar.

The method of manufacturing a rotor structure of an induction motor according to the present invention comprises the steps of: a) pressing a plate using a counter punch to produce a first steel plate having a first slot through which it is formed; b) adding an auxiliary member to the counter punch and then pressing the plate to manufacture a second steel plate having a second slot having a different shape from that of the first slot penetrating therethrough; c) manufacturing a core by stacking the first steel plate and the second steel plate manufactured in steps a) and b) so that the first slot or the second slot formed through each of them is connected to each other to form an insertion space. step; And d) after injecting the molten metal into the insertion space, solidifying the molten metal to form a conductor bar.

In addition, step c) is characterized in that the first steel plate and the second steel plate are alternately laminated in a predetermined pattern.

In addition, the step d) may include: d-1) inserting a working bar smaller than the insertion space into the insertion space; And d-2) injecting molten metal into the remaining space of the insertion space, and then hardening to prepare a starting bar to form a conductor bar.

In addition, the working bar and the starting bar are made of different metals.

In addition, the working bar is made of copper, and the starting bar is made of aluminum.

In addition, a plurality of the first slots or the second slots are formed radially with respect to the center of each steel plate, and the single first slot or the second slot is an inner side located in the center direction of each formed steel plate. It consists of a space and an outer space located outside the steel plate, characterized in that the outer space of the first slot is different from the outer space of the second slot.

In addition, the outer space of the first slot is characterized in that a certain portion is removed from the outer space of the second slot.

In addition, in step d-1), at least a portion of the working bar is inserted into the inner space, and in step d-2), the starting bar is manufactured in the outer space.

In the step d), after disposing a mold capable of forming a ring on both sides of the core, a molten metal is injected into the insertion space, and then hardened to form the conductor bar and the ring electrically connected to the conductor bar. It is characterized by forming.

According to the rotor structure of the induction motor and the method of manufacturing the same according to the present invention as described above, since it is possible to manufacture steel plates with slots of different shapes using a single counter punch, the rotor of the induction motor is manufactured. In doing so, there is an effect of improving economic efficiency.

In addition, according to the present invention, by manufacturing the core by varying the lamination ratio of the first steel plate and the second steel plate in which slots of different shapes are formed, it is possible to more easily change the characteristics of the rotor core of the induction motor.

1 is a perspective view of a conventional squirrel cage rotor core and a cross-sectional view of a conductor bar.
2 is a perspective view of a conventional double cage rotor core and a cross-sectional view of a conductor bar.
3 is a perspective view of a rotor structure of an induction motor according to a first embodiment of the present invention.
4 is a cross-sectional view of different positions of the core of the rotor structure of the induction motor according to the first embodiment of the present invention.
5 is a cross-sectional view of different positions of a core of a rotor structure of an induction motor according to a second embodiment of the present invention.
6 is a cross-sectional view of different positions of a core of a rotor structure of an induction motor according to a third embodiment of the present invention.
7 is a schematic diagram of step a) of the method of manufacturing the rotor structure of the induction motor according to the first embodiment of the present invention.
8 is a schematic diagram of step b) of a method of manufacturing a rotor structure of an induction motor according to the first embodiment of the present invention.
9 is a schematic diagram of a process in which step c) of a method for manufacturing a rotor structure of an induction motor according to the first embodiment of the present invention is performed.
10 is a schematic diagram of step d-1) of a method for manufacturing a rotor structure of an induction motor according to a second embodiment of the present invention.

Hereinafter, a preferred embodiment of a rotor structure of an induction motor according to the present invention will be described in detail with reference to the accompanying drawings.

[Rotor structure of induction motor according to the first embodiment]

3 schematically shows a rotor structure of an induction motor (hereinafter, a rotor structure of an induction motor) according to the first embodiment of the present invention.

As shown in FIG. 3, the rotor structure of the induction motor according to the first embodiment of the present invention may include a core 100 and a conductor bar 200.

As shown in FIG. 3, the core 100 is configured by stacking a plurality of steel plates in one direction, and rotates when the induction motor is operated. The plurality of steel plates forming the core 100 may be divided into a first steel plate 111 and a second steel plate 112, and the criteria for classifying the first steel plate 111 and the second steel plate 112 are each The shape of the slot S formed in the steel plate, and the difference in shape of the slots S formed in the first steel plate 111 and the second steel plate 112, respectively, will be described later.

As shown in FIG. 3, a plurality of slots S formed in the first steel plate 111 are formed radially through the center of one surface of the first steel plate 111. In other words, the slot (S) may be formed through a predetermined distance from the center of the first steel plate 111 radially outward, and a plurality of slots S may be formed at a predetermined angular interval in the circumferential direction. The slot S may be formed in the same position for all of the first steel plates 111, and the slots may be formed in the same position as the first steel plate 111 in the second steel plate 112 as well.

The first steel plate 111 and the second steel plate 112 may be laminated in a predetermined pattern. At this time, the predetermined pattern refers to the ratio and the position at which the first steel plate 111 and the second steel plate 112 are stacked, and the rotor structure of the induction motor according to the first embodiment of the present invention shown in FIG. In the three first steel plates 111 and one second steel plate 112 are alternately stacked to constitute the core 100. However, the present invention is not limited to the pattern in which the first steel plate 111 and the second steel plate 112 are laminated to the rotor structure of the induction motor according to the second embodiment of the present invention shown in FIG. In order to change the characteristics of the electric motor, the pattern in which the first steel plate 111 and the second steel plate 112 are stacked may be changed as much as possible.

A plurality of the first steel plate 111 and the second steel plate 112 constituting the core 100 may be stacked so that the slots S formed in each are connected to each other, and the slot S formed at the same position of each of the steel sheets They can be connected to each other to form a kind of insertion space.

As shown in FIG. 3, the conductor bar 200 may be formed in the insertion space formed by connecting the slots S of the steel plates to each other. As described in the background art, the conductor bar 200 is a member that determines the characteristics of the induction motor, and may be formed of a conductive member, may be formed of a single metal, or may be formed of different types of metals. In the rotor structure of the induction motor according to the first embodiment of the present invention shown in FIG. 3, the conductor bar 200 is made of a single metal, and the conductor bar 200 formed of different kinds of metals will be described later. do.

3, a plurality of conductor bars 200 are formed inside a plurality of insertion spaces. In FIG. 3, a single conductor bar 200 is shown outside the insertion space formed by the slots S. In this embodiment, the conductor bar 200 is inserted into the insertion space formed by the slots S. No, it can be manufactured by injecting molten metal into the insertion space in the same manner as die-casting, and then solidifying the metal to form inside the insertion space.

As shown in FIG. 3, while the conductor bar 200 proceeds in an extended direction, its cross-section is not constant.

4A is a diagram showing a surface (cross-section) of a portion of the core 100 on which the conductor bar 200 is formed shown in FIG. 3 is cut by a virtual line A-A′, and FIG. 4B is A part of the core 100 is a surface of the conductor bar 200 shown in FIG. 3 cut by a virtual line B-B'. That is, in FIG. 3, A-A' and B-B' are shown on the conductor bar 200, but in fact, FIG. 4 shows a surface of the core 100 of the corresponding portion of the conductor bar 200 cut.

As can be seen through FIGS. 3, 4A and 4B, the conductor bar 200 is extended to one side and two cross-sectional shapes alternately appear, and in more detail, the conductor bar 200 is a cage type shown in FIG. 4A. ) And the second section 220 of the double cage type shown in FIG. 4B alternately appear.

That is, in the present embodiment, the conductor bar 200 does not have a certain cross section, and the characteristics (efficiency or operation torque) of the induction motor are adjusted through the characteristic that the first end face 210 and the second end face 220 appear alternately. can do. As described above, since the conductor bar 200 is manufactured using a die casting method in which molten metal is injected into the insertion space formed by the slots S and then hardened, the first end face 210 and the second end face 220 The shape may be determined according to the shape of the insertion space into which the molten metal is injected. That is, the shape of the first end face 210 and the second end face 220 may be the same as the shape of the slots respectively formed in the first steel plate 111 and the second steel plate 112, respectively, and the shape of the conductor bar 200 In order to change the characteristics of the induction motor through the shape, a process of adjusting the lamination ratio of the first steel plate 111 and the second steel plate 112 is required.

The first end surface 210 and the second end surface 220 of the conductor bar 200 will be described in more detail with reference to FIG. 4.

As shown in FIG. 4, the first end face 210 has a larger area than the second end face 220, and becomes the second end face 220 by removing a part of the middle of the first end face 210. The inner side and the outer side of the first end face 210 and the second end face 220 (based on the center of the steel plate) may be divided into a working bar and a starting bar. A single slot formed in the steel plate may be divided into an inner space in which a working bar is formed and an outer space in which a starting bar is formed, and an inner space in which a working bar is formed and an outer space in which a starting bar is formed. The line that serves as a reference for dividing the inner space and the outer space of the slot is a criterion for dividing the first end face 210 and the second end face 220, and an arbitrary line connecting a portion removed from the first end face 210 It may be a line (a virtual line connecting the concave portion in the second cross-section of FIG. 4B), and the slot in which the first end surface 210 of the conductor bar 200 is formed is also used in the inner space and the outer side through the arbitrary line. Space can be divided.

In the rotor structure of the induction motor according to the first embodiment of the present invention, the conductor bar 200 may be made of a metal such as copper or aluminum, and since the melting point of aluminum is lower than that of copper, aluminum is used as a conductor. The bar 200 may be formed inside the insertion space.

[Rotor structure of an induction motor according to the second and third embodiments]

In the rotor structure of the induction motor according to the first embodiment of the present invention described with reference to FIGS. 3 and 4 above, the conductor bar 200 is made of a single metal. In the rotor structure of the induction motor according to the second and third embodiments of the present invention to be described below, the conductor bar 200 may be made of different metals.

5 is a cross-sectional view of a rotor structure of an induction motor according to a second embodiment of the present invention at different positions. FIG. 5A shows a cross section of the first steel plate 111, and FIG. 5B shows the second steel plate 112. ) Is shown.

5A and 5B, the conductor bar may include a working bar 230 and a starting bar 240. The working bar 230 is inserted into the inner space of the slot, and the starting bar 240 is formed in the outer space of the slot. The working bar 230 and the starting bar 240 may be made of different metals. Specifically, the working bar 230 may be made of copper, and the starting bar 240 may be made of aluminum. However, in the present invention, the materials of the working bar 230 and the starting bar 240 constituting the conductor bar are not limited to copper and aluminum as described above, and there may also be embodiments in which the conductor bar is manufactured with other types of metal. .

In FIG. 5, the working bar 230 is manufactured in advance and can be inserted into the insertion space formed by the slot S, and the starting bar 240 is formed in the insertion space by a die casting method after the working bar 230 is inserted. Can be. The starting bar 240 is difficult to insert after being manufactured, which corresponds to the insertion space formed by connecting the outer spaces of the slots to each other because the outer spaces of the slots formed in each of the first steel plate 111 and the second steel plate 112 are different. This is because it cannot be inserted after the starting bar 240 is manufactured in advance. For the effect of the method of forming the starting bar 240 by the die-casting method after manufacturing the working bar 230 in advance and inserting it into the insertion space, the method of manufacturing the rotor structure of the induction motor according to an embodiment of the present invention is described. When explaining, it will be described in detail.

6 is a cross-sectional view of a rotor structure of an induction motor according to a third embodiment of the present invention at different positions. FIG. 6A shows a cross section of the first steel plate 111, and FIG. 6B shows the second steel plate 112. ) Is shown.

The difference from the rotor structure of the induction motor according to the third embodiment of the present invention shown in FIG. 6 and the rotor structure of the induction motor according to the second embodiment of the present invention shown in FIG. ) And the shape of the starting bar 240. As shown in FIG. 6, in this embodiment, the working bar 230 is located not only in the inner space of the slot, but also located in the outer space, and the starting bar 240 is formed only on the first steel plate 111. In this embodiment, after manufacturing the working bar 230 in advance, the working bar 230 is inserted into the insertion space, and the molten metal is injected into the insertion space, and the starting bar 240 is formed by hardening. Since the walking bar 230 having the shape as shown in FIG. 6 occupies most of the space of the slot formed in the second steel plate 112, the molten metal will be injected into the remaining space of the slot formed in the second steel plate 112. Inevitably, therefore, the starting bar 240 is formed only on the second steel plate 112. In this embodiment, the working bar 230 may be formed of copper and the starting bar 240 may be formed of aluminum.

[Method of manufacturing a rotor structure of an induction motor according to the first embodiment]

Hereinafter, a method of manufacturing a rotor structure of an induction motor according to a first embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The method for manufacturing the rotor structure of the induction motor according to the first embodiment of the present invention is a method for manufacturing the rotor structure of the induction motor according to the first embodiment of the present invention described above, and steps a) to d) It may include.

In step a), the plate is pressed using a counter punch to manufacture a first steel plate in which the first slot is formed.

7 schematically shows the process of step a) of the method of manufacturing the rotor structure of the induction motor according to the first embodiment of the present invention.

As shown in FIG. 7, a structure for forming a second steel plate through which a slot is penetrated is formed on the lower surface of the counter punch 300, and the steel plate 400 before being pressed is at the lower side of the counter punch 300. ) Is located. The structure formed on the lower surface of the counter punch 300 includes a first press structure 310 for forming the outer shape of the second steel plate and a second press structure 320 for forming a slot in the second steel plate. The first press structure 310 and the second press structure 320 shown in FIG. 7 can manufacture a second steel plate in which a slot having a shape corresponding to the second press structure 320 is formed through, but slots of different shapes It is not possible to manufacture this perforated first steel plate.

In step b), after adding the auxiliary member to the counter punch, the plate is pressed to manufacture a second steel plate in which a second slot having a shape different from that of the first slot is penetrated.

8 schematically shows the process of step b) of the method of manufacturing the rotor structure of the induction motor according to the first embodiment of the present invention.

As shown in Fig. 8, in step b) of the method of manufacturing the rotor structure of the induction motor according to the first embodiment of the present invention, in order to manufacture the first steel plate, an auxiliary press member is applied to the second press structure 320. 330 can be inserted. The second press structure 320 and the auxiliary press member 330 together can form a shape of a slot to be formed in the first steel plate, and the auxiliary press member 330 is inserted into the lower surface of the single counter punch 300 described above. In this way, different first steel plates and second steel plates can be manufactured using a single mold (counter punch), thereby improving economic efficiency.

Steps a) and b) may be repeatedly performed alternately with each other, or step a) may be repeatedly performed a certain number of times, and then step b) may be repeatedly performed a certain number of times.

Step c) is a step of laminating the first steel sheet and the second steel sheet manufactured in steps a) and b), wherein the first slot or the second slot formed through each of the first and second steel sheets are connected to each other. Stacked. Step c) may be performed during step a) or step b), or may be performed after steps a) and ｂ) are both performed. However, considering the economy and space efficiency of manufacturing equipment, step a) or step b It is preferable that it is made while the) step is performed.

9 schematically shows a process in which step c) is performed.

9, in step c), the first steel plate laminate 111a and the second steel plate laminate 112a may be laminated in one direction, and the first steel plate laminate 111a and the second steel plate laminated The sieves 112a may be alternately stacked. In FIG. 9, the first steel plate laminate 111a and the second steel plate laminate 112a are formed by stacking five first steel plates or second steel plates, respectively, and the number of steel plates included in each laminate is to be realized. It can be changed according to the characteristics of the induction motor.

In step d), molten metal is injected into the slot (S) of the core manufactured by performing step c), and the injected molten metal is hardened, so that a conductor bar may be formed inside the insertion space. That is, in this embodiment, the conductor bar may be made of a single metal.

In step d), after the mold is placed on both sides of the core manufactured in step c), the molten metal may be injected. The molds located on both sides of the core are molds for forming rings that short-circuit the conductor bars formed in the rotor core, and the molten metal flows into the insertion space inside the core and the molds located on both sides of the core and hardens the conductor bars and rings. Since they are formed together, they are not required for a separate process of electrically connecting a conductor bar and a ring, so that manufacturing is easy and economical efficiency is improved.

[Method of manufacturing a rotor structure of an induction motor according to the second and third embodiments]

Hereinafter, a method of manufacturing a rotor structure of an induction motor according to the second and third embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the method of manufacturing the rotor structure of the induction motor according to the second and third embodiments of the present invention, only step d) is different in the method of manufacturing the rotor structure of the induction motor according to the first embodiment of the present invention. , The rotor structure of the induction motor according to the second and third embodiments of the present invention described above is manufactured, and only steps d) that are different will be described.

In the method of manufacturing the rotor structure of the induction motor according to the second and third embodiments of the present invention, step d) may include steps d-1) and d-2).

10 schematically shows step d-1) of the method of manufacturing the rotor structure of the induction motor according to the second embodiment of the present invention.

As shown in FIG. 10, step d-1) inserts a working bar 230 smaller than the insertion space into the insertion space formed in the core 100. Referring to FIG. 5, since the working bar 230 is inserted only in the inner space of the slot, the outer space of the slot (or insertion space) becomes empty, and step d-2) is the remaining space of the insertion space, that is, the outer space. After injecting the molten metal into the space, it is hardened to manufacture a starting bar 240 (Starting bar).

In the method of manufacturing the rotor structure of the induction motor according to the second embodiment of the present invention, since the mold for forming the ring is located on both sides of the core 100, the ring and the starting bar are manufactured together to electrically connect the ring and the conductor bar. A separate process of connecting is omitted, so economic feasibility can be improved.

In the method of manufacturing the rotor structure of the induction motor according to the third embodiment of the present invention, the shape of the working bar 230 is changed from those shown in FIGS. 5 to 6 compared to the second embodiment. However, when the working bar 230 has the shape shown in FIG. 6A, it occupies all portions of the slots formed in the second steel plate 112, and the molten metal for forming the starting bar may not be injected into the first steel plate. In this embodiment, in preparation for such a situation, the shape of the working bar 230 is formed smaller than the slot formed in the second steel plate 112, so that the molten metal easily flows into the slots formed in the first steel plate and the second steel plate. In addition, by injecting the molten metal at high pressure, the molten metal can more easily flow into the slots formed in the first steel plate and the second steel plate.

The technical idea should not be interpreted as limited to the above-described embodiment of the present invention. As well as a variety of application ranges, various modifications may be made at the level of those skilled in the art without departing from the gist of the present invention claimed in the claims. Therefore, these improvements and changes will fall within the scope of protection of the present invention as long as it is apparent to those skilled in the art.

10, 100: core
11, 400: steel plate
12, S: slot
20: conductor bar of squirrel cage rotor core
30: Conductor bar of double squirrel cage rotor core
31, 230: working bar
32, 240: starting bar
111: first steel plate
111a: first steel plate laminate
112: second steel plate
112a: second steel plate laminate
200: conductor bar
210: first section
220: second section
300: counter punch
310: first press structure
320: second press structure
330: auxiliary press member

Claims (18)

delete delete delete delete delete delete delete delete delete a) pressing the plate using a counter punch to manufacture a first steel plate having a first slot through which it is formed;
b) adding an auxiliary member to the counter punch and then pressing the plate to manufacture a second steel plate having a second slot having a different shape from that of the first slot penetrating therethrough;
c) manufacturing a core by stacking the first steel plate and the second steel plate manufactured in steps a) and b) so that the first slot or the second slot formed through each of them is connected to each other to form an insertion space. step; And
d) after injecting the molten metal into the insertion space, solidifying the molten metal to form a conductor bar;
Including,
In the step c), the first steel plate and the second steel plate are alternately laminated in a predetermined pattern, and the section in which the first steel plate is laminated and the section in which the second steel plate is laminated are stacked so that there are two or more sections, respectively. A method for manufacturing a rotor structure of an induction motor, characterized in that.
delete The method of claim 10,
Step d),
d-1) inserting a working bar smaller than the insertion space into the insertion space; And
d-2) injecting molten metal into the remaining space of the insertion space and then hardening to prepare a starting bar to form a conductor bar;
A method of manufacturing a rotor structure of an induction motor comprising a.
The method of claim 12,
The working bar and the starting bar are made of different metals.
The method of claim 13,
The working bar is made of copper, and the starting bar is made of aluminum.
The method of claim 12,
The first slot or the second slot is formed in a plurality of radially based on the center of each steel plate,
The single first slot or the second slot,
The inner space located in the center direction of each formed steel plate and
It consists of an outer space located on the outside of the steel plate,
The method of manufacturing a rotor structure of an induction motor, characterized in that the outer space of the first slot is different from the outer space of the second slot.
The method of claim 15,
A method of manufacturing a rotor structure of an induction motor, wherein the outer space of the first slot has a shape in which a certain portion is removed from the outer space of the second slot.
The method of claim 15,
In the step d-1), at least a portion of the walking bar is inserted into the inner space,
In the step d-2), the starting bar is manufactured in the outer space.
The method of claim 10,
In the step d), after disposing a mold capable of forming a ring on both sides of the core, a molten metal is injected into the insertion space, and then hardened to form the ring electrically connected to the conductor bar and the conductor bar. Method for manufacturing a rotor structure of an induction motor, characterized in that.

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