JP6435924B2 - Rotor for induction motor and method for manufacturing the same - Google Patents

Description

  The present invention relates to an induction motor rotor applied to a squirrel-cage induction motor and a method for manufacturing the same.

2. Description of the Related Art Conventionally, an induction motor including a rotor in which a secondary conductor composed of a bar and an end ring is formed on a rotor iron core made of a laminated steel plate is known (see, for example, Patent Document 1).
Here, the “induction motor” means that an induction current is generated in the conductor metal (secondary conductor) of the rotor due to the rotating magnetic field generated by the stator, and a magnetic field is generated around the conductor metal due to the induced current. A motor that is induced to rotate.

JP-A-9-215287

  However, in conventional induction motor rotors, die casting jigs are installed at both ends of the rotor core, and aluminum metal melted by the casting method is poured into the rotor, so that the entire rotor is cast and A secondary conductor was formed. Then, if there is a conductor metal in the rotor iron core that generates the magnetic field, the generation of the magnetic field is hindered, so it is necessary to remove the aluminum material by cutting or the like. As described above, there is a problem that it is disadvantageous in terms of man-hours and costs because it requires an aluminum die-casting equipment and a cutting process for removing excess aluminum material.

  The present invention has been made paying attention to the above-mentioned problems, and provides a rotor for an induction motor that is advantageous in terms of man-hours and costs, and a method for manufacturing the same, by eliminating a conductor metal by casting and a casting process. Objective.

  In order to achieve the above object, an induction motor rotor according to the present invention includes a laminated steel plate in which electromagnetic steel plates are laminated, and a conductor metal embedded in a plurality of slot holes penetrating in the lamination direction of the laminated steel plate. In this induction motor rotor, the conductor metal was a slot-type conductor laminate constituted by laminating electromagnetic steel plates having slot-type conductor plates fitted into the slots.

  The method for manufacturing a rotor for an induction motor according to the present invention includes a slot punching step, a slot-shaped conductor plate forming step, a slot-shaped conductor plate fitting step, and a composite rotor plate laminating step. In the slot punching process, a portion corresponding to the slot of the electromagnetic steel sheet material is punched. In the slot-shaped conductor plate forming step, a conductive metal plate material having substantially the same thickness as that of the electromagnetic steel plate material is formed into a slot-shaped conductor plate having a fitting shape into the slot of the electromagnetic steel plate material. In the slot-type conductor plate fitting step, the slot-type conductor plate is fitted into the slot punched portion of the electromagnetic steel sheet material. In the composite rotor plate laminating step, the electromagnetic steel sheet material in which the slot-shaped conductor plate is fitted into the slot is punched along the outer diameter of the rotor, and a predetermined number of the punched composite rotor plates are stacked.

  In the induction motor rotor, the conductor metal is a slot-type conductor laminate formed by laminating electromagnetic steel plates having slot-type conductor plates fitted into the slots. That is, by eliminating the conductive metal by casting and making the conductive metal a slot-type conductive laminate, it is possible to provide an induction motor rotor that is advantageous in terms of man-hours and costs.

  In the induction motor rotor manufacturing method, the slot for the induction motor is manufactured after the slot punching step and the slot-shaped conductor plate forming step, followed by the slot-shaped conductor plate fitting step → the composite rotor plate lamination step. That is, by eliminating the casting process and making it a process that can be performed in the press facility, it is possible to provide an induction motor rotor manufacturing method that is advantageous in terms of man-hours and costs.

It is a partial cross section perspective view which shows an example of the induction motor to which the rotor for induction motors of Example 1 was applied. It is a front view which shows the stator side electromagnetic steel plate and rotor side electromagnetic steel plate of the induction motor of Example 1. FIG. FIG. 3 is a front view showing a composite rotor plate in which a slot-shaped conductor plate is fitted in a slot of a rotor-side electromagnetic steel plate in the induction motor rotor according to the first embodiment. FIG. 4 is a cross-sectional view taken along line AA of FIG. 3 showing a rotor core in which composite rotor plates are laminated in the axial direction in the induction motor rotor according to the first embodiment. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall view illustrating an example of a press facility applied to a method for manufacturing an induction motor rotor according to a first embodiment. It is process drawing which shows the manufacturing method of the rotor for induction motors of Example 1. FIG. FIG. 7 is a cross-sectional view taken along the line BB of FIG. It is a top view which shows the stator punching process in the manufacturing method of the rotor for induction motors of Example 2. FIG. It is a front view which shows the composite rotor board by which the slot-shaped conductor board was engage | inserted in the slot of the rotor side electromagnetic steel plate in the rotor for induction motors of another example.

  Hereinafter, the best mode for realizing the rotor for an induction motor and the method for manufacturing the same according to the present invention will be described based on Example 1 and Example 2 shown in the drawings.

  The induction motor rotor and the manufacturing method thereof according to the first embodiment will be described by dividing them into “a configuration and an operation of the induction motor rotor” and “a process and an operation of the induction motor rotor manufacturing method”.

[Configuration and operation of rotor for induction motor]
First, the outline of the induction motor will be explained. A typical example is a "three-phase AC squirrel-cage induction motor". Its feature is that it does not require a permanent magnet like a synchronous motor, and also requires a sensor to monitor the rotor. There is also a merit that it is low cost, has a strong structure and does not require maintenance. Motor control is generally performed by a VVVF (variable voltage, variable frequency modulation) inverter and does not require a sensor, so that the inverter is also low in cost compared to a synchronous motor. The motor structure is rotated by a three-phase AC rotating magnetic field as in the case of a synchronous motor. However, there are no permanent magnets in the rotor, and a number of rod-shaped conductor metals through which current flows are arranged. The structure is short-circuited with a ring. Since the conductor metal structure of the rotor resembles a “cage”, it is called a cage type induction motor.

  FIG. 1 shows an example of an induction motor M to which the induction motor rotor of the first embodiment is applied. Hereinafter, the overall configuration of the induction motor M will be described with reference to FIG.

  As shown in FIG. 1, the induction motor M includes a stator casing 1, a stator 2, a rotor 3, and a motor shaft 4.

  The stator casing 1 has a motor base portion 1a, and a stator 2 is fixed to the inner surface. A load side bracket 5 is connected and fixed to one end side of the stator casing 1, and an anti-load side bracket 6 is connected and fixed to the other end side. A fan cover 7 is fixed to the non-load side bracket 6 so as to cover it, and a cooling fan 8 rotated by the motor shaft 4 is disposed inside the fan cover 7.

  The stator 2 is fixed to the inner surface of the stator casing 1 and includes a stator-side laminated steel plate 9 called a stator iron core and a stator coil 10.

  The rotor 3 is provided on the motor shaft 5, the rotor outer peripheral surface is disposed via the inner peripheral surface of the stator 2 and an air gap, the rotor side laminated steel plate 11 called a rotor core, the slot-shaped conductor laminated plate 12, And a short circuit ring 13. Here, the combined configuration of the rotor-side laminated steel plate 11 and the slot-shaped conductor laminated plate 12 is referred to as “rotor core RC”, and this “rotor core RC” corresponds to the “rotor for induction motor” that is the object of the present invention.

  The motor shaft 4 rotates integrally with the rotor 3 and is supported at both ends rotatably by a load side bearing 14 provided on the load side bracket 5 and an anti load side bearing 15 provided on the anti load side bracket 6. Is done.

  FIG. 2 shows a stator side electromagnetic steel plate and a rotor side electromagnetic steel plate of the induction motor M of Example 1, and FIG. 3 shows a composite rotor plate in which a slot-shaped conductor plate is fitted in a slot of the rotor side electromagnetic steel plate. 4 shows the rotor core RC which laminated | stacked the composite rotor board on the axial direction. Hereinafter, based on FIGS. 2-4, the detailed structure of rotor core RC which is a rotor for induction motors is demonstrated.

  The stator-side laminated steel sheet 9 included in the stator 2 is configured by laminating a large number of stator-side electromagnetic steel sheets 9a made of a ring-shaped plate having an inner diameter larger than the outer diameter of the rotor-side electromagnetic steel sheet 11a shown in FIG. A plurality of stator side slots 9b are punched out at equal intervals in the inner circumferential position of the stator side electromagnetic steel sheet 9a. A plurality of slot holes penetrating in the axial direction are formed by punching the stator side slot 9b and stacking the stator side electromagnetic steel plates 9a, and the stator coil 10 is wound along the plurality of formed slot holes. In addition, a silicon steel plate material etc. are used as a raw material of the stator side electromagnetic steel plate 9a.

  The rotor-side laminated steel plate 11 included in the rotor 3 is configured by laminating a large number of rotor-side electromagnetic steel plates 11a made of a ring-shaped plate having a motor shaft hole 11c formed at the center shown in FIG. 2 (FIG. 4). A plurality of rotor-side slots 11b are punched out at equal intervals in the circumferential direction at the outer peripheral position of the rotor-side electromagnetic steel plate 11a. A plurality of slot holes penetrating in the axial direction are formed by punching the rotor side slot 11b and laminating the rotor side electromagnetic steel plates 11a.

  As shown in FIG. 3, the slot-type conductor laminated plate 12 of the rotor 3 is formed by laminating a large number of rotor-side electromagnetic steel plates 11a (= composite rotor plate 53) having slot-shaped conductor plates 12a in the axial direction. Composed. That is, as shown in FIG. 4, the slot-shaped conductor laminated plate 12 has a configuration in which a large number of slot-shaped conductor plates 12a fitted in the rotor side slots 11b are laminated along the slot holes penetrating in the axial direction. Is done. Here, as shown in FIG. 3, the rotor-side slot 11b is shaped to open to the outer peripheral end of the rotor-side electromagnetic steel plate 11a, whereas the slot-shaped conductor plate 12a fitted into the rotor-side slot 11b It is set as the shape which does not reach the outer periphery end of the side electromagnetic steel plate 11a. That is, an open type rotor core RC in which the slot-shaped conductor laminate 12 is exposed on the outer surface of the rotor 3 is used.

  The short-circuit ring 13 included in the rotor 3 is provided on both sides of a rotor core composed of the rotor-side laminated steel plate 11 and the slot-shaped conductor laminated plate 12, as shown by phantom lines in FIG. It is disposed in contact with both end faces of the shaped conductor laminate 12. In addition, as a raw material of the rotor side electromagnetic steel plate 11a, the board | plate material by the same raw material as the stator side electromagnetic steel plate 9a, such as a silicon steel plate material, is used. On the other hand, as the material of the slot-shaped conductor plate 12a, a material different from that of the stator side electromagnetic steel plate 9a and the rotor side electromagnetic steel plate 11a is used, and a nonmagnetic magnetic material such as an aluminum plate or a copper plate is used. As the material of the short-circuit ring 13, the same material as that of the slot-shaped conductor plate 12a is used.

As described above, in the first embodiment, in the rotor core RC, the conductor metal of the rotor 3 is configured by laminating the rotor-side electromagnetic steel plates 11a having the slot-shaped conductor plates 12a fitted in the respective rotor-side slots 11b. The slot-type conductor laminate 12 is used.
In other words, when a “cage” of an induction motor rotor is manufactured by an aluminum die casting method as a comparative example, an aluminum die casting facility is required and a cutting process to remove excess aluminum material is required. And it is disadvantageous in terms of cost.
On the other hand, the conductor metal by casting, such as aluminum die casting, was abolished and the conductor metal was used as the slot-type conductor laminate 12. This eliminates the need for an aluminum die-casting facility and eliminates the need for a cutting process for removing excess aluminum material. As a result, the rotor core RC of the induction motor M that is advantageous in terms of man-hours and costs can be provided.

[Process and Operation of Manufacturing Method of Induction Motor Rotor]
FIG. 5 illustrates an example of a press facility applied to the method for manufacturing the rotor for an induction motor according to the first embodiment. Hereinafter, the configuration of the press facility will be described with reference to FIG.

  As shown in FIG. 5, the press facility includes a press machine 21, an electromagnetic steel plate coil 22, a feeder 23, a conductive metal plate coil 24, and a rotor core conveyor 25.

  The press machine 21 includes a fixed frame 26, a lower mold 27 provided on the fixed frame 26, a movable frame 28 that moves up and down, and an upper mold 29 that is provided at a position opposite to the lower mold 27 of the movable frame 28. , And is configured.

  The electromagnetic steel sheet coil 22 is a coil around which a magnetic steel sheet material before processing to be the rotor-side electromagnetic steel sheet 11a is wound, and the electromagnetic steel sheet material 51 is formed by intermittent operation in which the roller 23 is stopped and rotated by the feeder 23 repeatedly. From the left side to the right side, it is sent out at a movement interval for each process. Here, the direction in which the electromagnetic steel sheet material 51 flows by intermittent movement is referred to as “line direction”.

  The conductor metal plate coil 24 is a coil around which a conductor metal plate material before processing to become the slot-shaped conductor plate 12a is wound, and the conductor metal plate material 52 is moved in a direction orthogonal to the line direction by intermittent operation with a feeder (not shown). To the process at the movement interval of each process. Here, the transfer direction of the conductor metal plate material 52 may be sent from the front of the line in FIG. 5 toward the line, or may be sent from the back of the line in FIG. 5 toward the line. As the conductive metal plate coil 24, an aluminum plate coil, a copper plate coil, or the like is used.

  The rotor core conveyor 25 is a conveyor that discharges a rotor core RC (rotor side laminated steel sheet 11 + slot-shaped conductor laminated board 12) manufactured by a press facility in a direction perpendicular to the line direction. Here, the rotor core RC may be discharged from the line in FIG. 5 toward the front side of the line or from the line in FIG. 5 toward the back side of the line.

  6 and 7 show a method for manufacturing the rotor for an induction motor according to the first embodiment. Hereinafter, based on FIG.6 and FIG.7, each process which is a component of the manufacturing method of rotor core RC which is a rotor for induction motors is demonstrated.

  The manufacturing method of the rotor core RC includes, as basic steps, a slot punching step, a slot-shaped conductor plate forming step, a slot-shaped conductor plate fitting step, and a composite rotor plate laminating step. Hereinafter, each process will be described.

  In the slot punching step, a portion corresponding to the rotor side slot 11b of the electromagnetic steel sheet material 51 is punched. That is, this is a process of making the rotor-side electromagnetic steel plate 11a by the ring-shaped plate in which the rotor-side slot 11b and the motor shaft hole 11c shown in FIG. 2 are formed.

  In the slot-shaped conductor plate forming step, a conductor metal plate 52 having substantially the same thickness as the electromagnetic steel plate material 51 is formed into a slot-shaped conductor plate 12a having a fitting shape of the electromagnetic steel plate material 51 in the rotor side slot 11b.

  In the slot-shaped conductor plate fitting step, the slot-shaped conductor plate 12 a is fitted into the slot punched portion of the electromagnetic steel sheet material 51.

  In the composite rotor plate laminating step, the electromagnetic steel plate material in which the slot-shaped conductor plate 12a is fitted in the rotor side slot 11b is punched along the outer diameter of the rotor, and a predetermined number of punched composite rotor plates 53 are stacked.

  After the above steps, the rotor core RC is manufactured by combining the rotor-side laminated steel plate 11 in which the rotor-side electromagnetic steel plate 11a is laminated and the slot-type conductor laminated plate 12 in which the slot-shaped conductor plate 12a is laminated.

  In the method of manufacturing the rotor core RC in the first embodiment, the above basic steps are arranged to simplify and improve the efficiency. The manufacturing process includes a half-slotting process S1, a plate material supply process S2, an integration process S3, a motor shaft hole punching process S4, a composite rotor plate stacking process S5, and a rotor core discharging process S6. Hereinafter, each process will be described.

  In the half slotting step S1, as shown in FIG. 6, the portion corresponding to the rotor side slot 11b of the electromagnetic steel sheet material 51 transferred from the feeder 23 to the S1 position is half cut. Here, half punching is a state immediately before punching out a portion corresponding to the rotor side slot 11b, and means a state in which the connection with the electromagnetic steel sheet material 51 is maintained. As shown in FIG. 7, when the punch retainer 31 is lowered, the half punched slot in the slot half punching step S <b> 1 is positioned by pressing the electromagnetic steel sheet material 51 with the pad 30. The half punching punch 32 provided on the punch retainer 31 in this positioning presser state is formed by descending toward the half punching recess 33 to the middle position of the thickness of the electromagnetic steel sheet 51. The pad 30 is provided to the punch retainer 31 via a pad spring 34. The punch retainer 31 is moved up and down by the movable frame 28. The half punch 32 is provided on the punch retainer 31. The half punched recess 33 is formed in the die 35.

  As shown in FIG. 6, the sheet material superposition supply step S2 is superposed on the electromagnetic steel sheet material 51 having a half-cut slot, and the conductive metal sheet material 52 is formed from the direction orthogonal to the transfer direction of the electromagnetic steel sheet material 51 at the S2 position. Supply. At this time, the transfer timing of the electromagnetic steel sheet material 51 from the S1 position to the S2 position is matched with the supply timing of the conductor metal plate material 52 to the S2 position. In this plate material superposition supply step S2, while the press of the electromagnetic steel plate material 51 by the pad 30 is released and the space for supplying the conductor metal plate material 52 is secured, the movable frame 28 is set to the raised position.

  In the integrated processing step S3, as shown in FIG. 7, the slot-shaped conductor plate 12a is punched from the conductor metal plate 52, the half-punched slot is punched from the electromagnetic steel plate 51, and the rotor-side slot 11b is punched. The insertion of the slot-shaped conductor plate 12a is processed in one step (position S2). That is, the integrated processing step S3 is a step of integrating and simultaneously processing the “slot punching step”, “slot shape conductor plate forming step”, and “slot shape conductor plate fitting step” described in the basic step. In the integrated processing step S3, as shown in FIG. 7, when the punch retainer 31 is lowered, the conductor metal plate material 52 is pressed and positioned by the pad 30 while being superposed on the electromagnetic steel plate material 51. The punching and fitting punch 36 provided on the punch retainer 31 in this positioning presser state passes through the conductor metal plate 52 and descends to the upper surface position of the electromagnetic steel plate 51. That is, the integrated processing is performed in the order of punching of the slot-shaped conductor plate 12a from the conductor metal plate 52 → punching of the half-cut slot from the electromagnetic steel plate material 51 → insertion of the slot-shaped conductor plate 12a into the punched rotor side slot 11b. Is done. The slot-shaped scrap pieces punched out from the electromagnetic steel sheet material 51 fall through the through holes 37 formed in the die 35 and are received by the scrap shooter 39 provided in the scrap space 38 of the fixed frame 26.

  In the motor shaft hole punching step S4, as shown in FIGS. 6 and 7, the motor shaft hole 11c is punched from the electromagnetic steel sheet material 51 into which the slot-shaped conductor plate 12a transferred to the S4 position is fitted. In the motor shaft hole punching step S4, as shown in FIG. 7, when the punch retainer 31 is lowered, the electromagnetic steel sheet material 51 into which the slot-shaped conductor plate 12a is fitted is pressed and positioned by the pad 30. The motor shaft hole punching punch 40 provided in the punch retainer 31 is lowered to a position passing through the electromagnetic steel sheet material 51 in this positioning presser state. The circular scrap piece punched out from the electromagnetic steel sheet material 51 falls through the through hole 41 formed in the die 35 and is received by the scrap shooter 43 provided in the scrap space 42 of the fixed frame 26. .

  In the composite rotor plate stacking step S5, as shown in FIGS. 6 and 7, the electromagnetic steel plate material 51 transferred from the S4 position to the S5 position is punched along the outer diameter of the rotor and punched out. 3) is laminated. In the composite rotor plate stacking step S5, as shown in FIG. 7, when the punch retainer 31 is lowered, the electromagnetic steel plate material 51 in which the slot-shaped conductor plate 12a is fitted is pressed and positioned by the pad 30. The composite rotor plate 53 is punched when the composite rotor plate punching punch 44 provided on the punch retainer 31 is lowered to a position where it passes through the electromagnetic steel sheet material 51 in this positioning presser state. The composite rotor plate 53 punched out from the electromagnetic steel sheet material 51 is received by a lamination unit 46 provided in a lamination space 45 formed in the die 35 and the fixed frame 26. In the stacking unit 46, a predetermined number of composite rotor plates 53 are stacked while the spring 47 is contracted. In this composite rotor plate laminating step S5, a predetermined number of laminated composite rotor plates 53 are partially press-deformed to cause caulking between the plurality of rotor-side electromagnetic steel plates 11a and caulking between the plurality of slot-shaped conductor plates 12a. And simultaneously.

  In the rotor core discharging step S6, as shown in FIG. 6, a rotor core RC constituted by laminating a predetermined number of composite rotor plates 53 is placed on the rotor core conveyor 25 and discharged out of the line. The remaining steel plate portion in which the composite rotor plate 53 is punched out of the electromagnetic steel plate material 51 continuous with a predetermined width is cut into scrap pieces by the scrap cutter 48 downstream of the S5 position, and falls into the scrap space 49. Discharged.

As described above, in the first embodiment, the rotor core RC manufacturing method includes a slot punching step, a slot-shaped conductor plate forming step, a slot-shaped conductor plate fitting step, and a composite rotor plate laminating step. .
That is, after the slot punching step and the slot-shaped conductor plate forming step, the rotor core RC is manufactured by passing the slot-shaped conductor plate fitting step → the composite rotor plate lamination step. Here, the slot punching step and the slot-shaped conductor plate forming step may be steps performed in separate lines. Further, when the process is performed on the cross line, one process may be performed before the other process even if the slot punching process and the slot-shaped conductor plate forming process are performed simultaneously.
Thus, by eliminating the casting process and making it a process that can be performed entirely in the press facility, it is possible to provide a method of manufacturing a rotor core RC that is advantageous in terms of man-hours and costs.

In the first embodiment, the rotor core RC manufacturing method includes an integrated processing step S3 instead of the slot punching step, the slot-shaped conductor plate forming step, and the slot-shaped conductor plate fitting step. In the integration processing step S3, the slot-shaped conductor plate 12a is punched from the conductor metal plate material 52, the half-cut slot is punched from the electromagnetic steel plate material 51, and the slot-shaped conductor plate 12a is fitted into the punched rotor side slot 11b. Are configured in a single process.
That is, the process performed in the three processes of the slot punching process, the slot-shaped conductor plate forming process, and the slot-shaped conductor plate fitting process is achieved in one process of the integrated processing process S3.
Therefore, when manufacturing the rotor core RC, it becomes more advantageous in terms of man-hours and costs. In addition, for example, the rotor core RC can be manufactured by using a press facility that produces a rotor and a stator of a synchronous motor.

In Example 1, the composite rotor plate laminating step S5 is configured to simultaneously perform caulking between the rotor-side electromagnetic steel plates 11a and caulking between the slot-shaped conductor plates 12a.
That is, in order to manufacture the rotor core RC, when the composite rotor plates 53 are simply laminated, it is necessary to connect and fix a plurality of composite rotor plates 53 in a subsequent process. On the other hand, in the composite rotor plate stacking step S5, the plurality of composite rotor plates 53 are connected to each other in the press facility by adding caulking and fixing with the composite rotor plate 53 being stacked, without adding a post-process. Connected and fixed.

Next, the effect will be described.
In the induction motor rotor (rotor core RC) and the manufacturing method thereof according to the first embodiment, the following effects can be obtained.

(1) Laminated steel plate (rotor side laminated steel plate 11) in which electromagnetic steel plates (rotor side electromagnetic steel plate 11a) are laminated, and a conductor embedded in a plurality of slot holes penetrating in the lamination direction of the laminated steel plate (rotor side laminated steel plate 11) In an induction motor rotor (rotor core RC) comprising a metal,
The conductor metal was formed into a slot-shaped conductor laminate 12 formed by laminating the rotor-side electromagnetic steel plates 11a having the slot-shaped conductor plates 12a fitted in the respective slots (each rotor-side slot 11b) (FIG. 4).
Thus, since the conductor metal by casting was abolished, an induction motor rotor (rotor core RC) that is advantageous in terms of man-hours and costs can be provided.

(2) Laminated steel plate (rotor side laminated steel plate 11) obtained by laminating electromagnetic steel plates (rotor side electromagnetic steel plate 11a) and a conductor embedded in a plurality of slot holes penetrating in the lamination direction of the laminated steel plate (rotor side laminated steel plate 11) In a method of manufacturing an induction motor rotor (rotor core RC) comprising a metal,
A slot punching step of punching a portion corresponding to the slot (rotor side slot 11b) of the electromagnetic steel sheet material 51;
A slot-shaped conductor plate forming step of forming a conductor metal plate 52 having substantially the same thickness as the electromagnetic steel plate material 51 into a slot-shaped conductor plate 12a having a fitting shape into a slot (rotor side slot 11b) of the electromagnetic steel plate material 51;
A slot-shaped conductor plate fitting step of fitting the slot-shaped conductor plate 12a into the slot punched portion of the electromagnetic steel sheet material 51;
A composite rotor plate laminating step S5 in which the electromagnetic steel plate material 51 in which the slot-shaped conductor plate 12a is fitted in the rotor side slot 11b is punched along the outer diameter of the rotor, and a predetermined number of punched composite rotor plates 53 are stacked;
(FIG. 5).
Thus, since the casting process was abolished, it is possible to provide a method for manufacturing an induction motor rotor (rotor core RC) that is advantageous in terms of man-hours and costs.

(3) Instead of slot punching process, slot-shaped conductor plate forming process, slot-shaped conductor plate fitting process,
In a state where a portion corresponding to the slot (rotor side slot 11b) of the electromagnetic steel plate material 51 is half-cut, and the conductive metal plate material 52 is superposed and supplied on the electromagnetic steel plate material 51 having the half-cut slot, the conductor metal plate material 52 is supplied. Punching of the slot-shaped conductor plate 12a from the base plate, punching of the half-punched slot from the electromagnetic steel sheet material 51, and fitting of the slot-shaped conductor plate 12a into the punched slot (rotor side slot 11b) in one step. Integrated processing step S3 for processing (FIG. 6).
For this reason, in addition to the effect of (2), when manufacturing the rotor for induction motor (rotor core RC), it can be made more advantageous in terms of man-hour and cost. In addition, an induction motor rotor (rotor core RC) can be easily manufactured using existing press equipment.

(4) In the composite rotor plate lamination step S5, caulking between the electromagnetic steel plates (rotor side electromagnetic steel plate 11a) and caulking between the slot-shaped conductor plates 12a are simultaneously performed (FIG. 7).
For this reason, in addition to the effect of (2) or (3), a plurality of composite rotor plates 53 (rotor-side electromagnetic steel plates having slot-shaped conductor plates 12a fitted and fixed in a press facility without adding a post-process) 11a) can be connected and fixed together.

  Example 2 is an example in which a stator side electromagnetic steel plate of an induction motor is co-taken from an electromagnetic steel plate material obtained by punching a composite rotor plate.

First, the configuration will be described.
FIG. 8 shows a stator punching step in the method of manufacturing the rotor for induction motor (rotor core RC) according to the second embodiment. Hereinafter, a method for manufacturing the rotor core RC will be described with reference to FIG.

  In the second embodiment, in addition to the half-slotting step S1, the plate material supply step S2, the integration processing step S3, the motor shaft hole punching step S4, the composite rotor plate stacking step S5, and the rotor core discharging step S6 of the first embodiment, the stator punching step (S7 to S10). Hereinafter, the stator punching process (S7 to S10) added in the second embodiment will be described.

  As shown in FIG. 8, the stator punching step includes a slot punching step S7, an inner peripheral cutting step S8, an inner peripheral punching step S9, and an outer peripheral punching step S10. In addition, the electromagnetic steel plate material 51 ′ in the second embodiment has a plate width dimension expanded by the amount corresponding to the stamping out of the electromagnetic steel plate material 51 in the first embodiment.

  In the slot punching step S7, when the electromagnetic steel plate material 51 ′ in which the circular composite rotor plate 53 is punched in the composite rotor plate stacking step S5 is transferred to the S7 position, the stator side slot 9b is punched from the electromagnetic steel plate material 51 ′. .

  When the electromagnetic steel sheet material 51 ′ is transferred to the S8 position, the inner circumferential cutting step S8 is the inner periphery of the electromagnetic steel sheet material 51 ′ from which the stator side slot 9b has been punched, and has an inner diameter of the stator side electromagnetic steel sheet 9a. Make a cut at the corresponding position.

  In the inner peripheral punching step S9, when the electromagnetic steel sheet material 51 'is transferred to the S9 position, a ring-shaped inner peripheral piece is punched along a cutting position corresponding to the inner diameter of the stator side electromagnetic steel sheet 9a. This ring-shaped inner peripheral piece is a piece having a thickness corresponding to an air gap with the outer periphery of the rotor-side electromagnetic steel plate 11a.

  In the outer peripheral punching step S10, when the electromagnetic steel sheet material 51 'is transferred to the S9 position, it is punched along a position corresponding to the outer diameter of the stator side electromagnetic steel sheet 9a. By this punching, the stator side electromagnetic steel sheet 9a having the stator side slot 9b as shown in FIG. 2 is obtained. In addition, after punching out the stator side electromagnetic steel plate 9a, a predetermined number of these are laminated, and the stator side electromagnetic steel plate 9a is joined by caulking similarly to the rotor core RC, whereby the stator side laminated steel plate 9 is manufactured.

Next, the operation will be described.
For example, if a comparative example is one in which a “cage” of an induction motor rotor is manufactured by an aluminum die-casting method, the rotor side electromagnetic steel sheet is also slightly processed in the cutting process for putting a conductor metal made of aluminum on the outer surface of the rotor. Therefore, it is necessary to punch larger in the press process than the final rotor diameter. For this reason, the construction method of punching the rotor and the stator from the same electromagnetic steel sheet material cannot be used.

On the other hand, as described in the first embodiment, the composite rotor plate lamination in which the slot-shaped conductor plate 12a is fitted in the pressing process and the composite rotor plate 53 is punched at the final rotor diameter without using a casting method or a cutting process. A method of manufacturing the rotor core RC having the step S5 was adopted. For this reason, by adding the stator punching steps S7 to S10 subsequent to the composite rotor plate stacking step S5, it is possible to jointly take out the rotor side electromagnetic steel plate 11a and the stator side electromagnetic steel plate 9a from the same electromagnetic steel plate material 51 ′.
As a result, the rotor core RC included in the rotor 3 and the stator side laminated steel sheet 9 included in the stator 2 can be manufactured at a high yield and low cost.

Next, the effect will be described.
In the method of manufacturing the rotor for induction motor (rotor core RC) according to the second embodiment, the following effects can be obtained.

(5) After the composite rotor plate 53 is punched out in the composite rotor plate stacking step S5, the remaining steel plate material from which the composite rotor plate 53 is punched out of the electromagnetic steel plate material 51 ′ is used to make the stator side steel plate 9a of the induction motor M. The stator punching steps S7 to S10 for punching out are included (FIG. 8).
For this reason, in addition to the effects (2) to (4), the induction motor rotor (rotor core RC) included in the rotor 3 and the stator side laminated steel sheet 9 included in the stator 2 are manufactured at a high yield and low cost. be able to.

  As mentioned above, although the rotor for induction motors and the manufacturing method thereof according to the present invention have been described based on the first embodiment and the second embodiment, the specific configuration is not limited to these embodiments and the claims are not limited thereto. Modifications and additions of the design are permitted without departing from the spirit of the invention according to the claims.

  In the first embodiment, an example of an open type rotor core RC in which the slot-shaped conductor laminate 12 is exposed on the outer surface of the rotor 3 is shown. However, as shown in FIG. 9, the slot-shaped conductor plate 12a is fitted into the rotor-side slot 11b 'having a shape in which the outer peripheral end of the rotor-side electromagnetic steel plate 11a is closed. That is, an example of a closed type rotor core in which the slot-shaped conductor laminate 12 is not exposed to the outer surface of the rotor 3 may be used.

  In the first embodiment, instead of the slot punching step, the slot-shaped conductor plate forming step, and the slot-shaped conductor plate fitting step, an example is shown in which an integrated processing step S3 is performed in which these steps are processed in one step. However, an example in which the slot punching process, the slot-shaped conductor plate forming process, and the slot-shaped conductor plate fitting process are independent processes may be used.

  In the first embodiment, in the composite rotor plate laminating step S5, an example in which caulking between the rotor-side electromagnetic steel plates 11a and caulking between the slot-shaped conductor plates 12a is shown. However, it may be an example of setting a caulking process between the rotor side electromagnetic steel sheets and the slot-shaped conductor plates in the subsequent process of the composite rotor plate lamination process, or the rotor side electromagnetic steel sheets and the slot-shaped conductor plates may be caulked. It is good also as an example which carries out connection fixation by methods other than.

  In the second embodiment, the composite rotor plate 53 is punched by the composite rotor plate stacking step S5, and then the stator punching steps S7 to S10 for punching the stator side steel plate 9a of the induction motor M using the remaining part of the electromagnetic steel plate material 51 ′. showed that. However, the manufacturing process of the rotor core included in the rotor and the manufacturing process of the stator-side electromagnetic laminated steel sheet included in the stator may be separate processes.

  In the first and second embodiments, the induction motor rotor and the manufacturing method thereof according to the present invention are applied to a three-phase AC squirrel-cage induction motor. However, the rotor for an induction motor and the method for manufacturing the same according to the present invention can be applied to other types of induction motors. In short, any induction motor rotor including a laminated steel sheet in which electromagnetic steel sheets are laminated and a conductor metal embedded in a plurality of slot holes penetrating in the laminating direction of the laminated steel sheet can be applied.

RC rotor core (rotor for induction motor)
9 Stator side laminated steel sheet 9a Stator side electromagnetic steel sheet 9b Stator side slot 11 Rotor side laminated steel sheet (laminated steel sheet)
11a Rotor side electromagnetic steel sheet (electrical steel sheet)
11b Rotor side slot (slot)
12 slot-shaped conductor laminated plate 12a slot-shaped conductor plates 51, 51 'electromagnetic steel plate material 52 conductor metal plate material 53 composite rotor plate S1 half-punching step S2 plate material superposition supply step S3 integration processing step S4 motor shaft hole punching step S5 composite rotor plate Lamination process S6 Rotor core discharge process S7 to S10 Stator punching process

Claims (5)

In an induction motor rotor comprising: a laminated steel sheet in which electromagnetic steel sheets are laminated; and a conductor metal embedded in a plurality of slot holes penetrating in the laminating direction of the laminated steel sheet,
A slot-type conductor laminated plate configured by laminating the electromagnetic steel sheets having the slot-shaped conductor plate fitted in each slot, the conductor metal being a rotor for an induction motor. In a method of manufacturing a rotor for an induction motor, comprising: a laminated steel plate in which electromagnetic steel plates are laminated; and a conductor metal embedded in a plurality of slot holes penetrating in the laminating direction of the laminated steel plate,
A slot punching process for punching a portion corresponding to the slot of the electrical steel sheet material;
A slot-shaped conductor plate forming step of forming a conductor metal plate material having substantially the same thickness as the electromagnetic steel plate material into a slot-shaped conductor plate having a fitting shape into a slot of the electromagnetic steel plate material;
A slot-shaped conductor plate fitting step for fitting the slot-shaped conductor plate to a slot punched portion of the electromagnetic steel sheet material;
A composite rotor plate laminating step in which the electromagnetic steel sheet material in which the slot-shaped conductor plate is fitted in the slot is punched along the outer diameter of the rotor, and a predetermined number of the punched composite rotor plates are stacked;
A method of manufacturing a rotor for an induction motor, comprising: In the manufacturing method of the rotor for induction motors described in Claim 2,
Instead of the slot punching step, the slot-shaped conductor plate forming step, the slot-shaped conductor plate fitting step,
Punching the slot-shaped conductor plate from the conductive metal plate material in a state where the portion corresponding to the slot of the electromagnetic steel plate material is half-cut, and the conductive metal plate material is supplied over the electromagnetic steel plate material having the half-cut slot And an integrated processing step of processing a half-punched slot from the electromagnetic steel sheet material and fitting a slot-shaped conductor plate into the punched slot in one step. A method for manufacturing a rotor. In the manufacturing method of the rotor for induction motors described in Claim 2 or Claim 3,
The method of manufacturing a rotor for an induction motor, wherein the composite rotor plate laminating step simultaneously performs caulking between electromagnetic steel plates and caulking between slot-shaped conductor plates. In the manufacturing method of the rotor for induction motors described in any one of Claim 2 to Claim 4,
After punching out the composite rotor plate by the composite rotor plate laminating step, it has a stator punching step of punching out the stator side steel plate of the induction motor using the remaining steel plate material from which the composite rotor plate is punched out of the electromagnetic steel plate material. A method of manufacturing a rotor for an induction motor, characterized in that