JP2010268561A - Rotor for rotating electrical machine and the rotating electrical machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor for rotating electrical machines and a rotating electrical machine wherein a copper bar can be easily inserted in a slot in a rotor core. <P>SOLUTION: The rotor core 8 of the rotor 3 is constituted, by combining together an annular inner radius-side split core 15 and an annular outer radius-side split core 16. The inner radius-side split core 15 is provided with a large number of slot formation portions 17, and the outer radius-side split core 16 is provided with a large number of slot formation portions 19. A large number of slots 7 are formed in the circumferential direction, by combining the slot formation portions 17 and the slot formation portions 19, and a copper bar 9 formed of copper or copper alloy is provided in each of the slots 7. As a result, the copper bars 9 can be inserted into the slot forming portions 17 or the slot forming portions 19, from a radial direction in front of the inner radius side split core 15 and the outer radius side split core 16 are combined together. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rotor of a rotating electrical machine having a bar and a short-circuit ring, and the rotating electrical machine.

  Generally, a squirrel-cage induction motor is used as a drive source for pumps and fans. A number of bars and short-circuit rings provided in the cage rotor of this cage induction motor are formed by aluminum die casting that is low in cost and excellent in productivity.

  In recent years, in order to increase the rotation efficiency of a squirrel-cage induction motor, a squirrel-cage rotor in which bars and a short-circuit ring are made of copper, which is more conductive than aluminum, has been considered. For example, a so-called cage of a squirrel-cage rotor may be configured by combining a copper-based bar and a copper-based short circuit ring by welding or the like, or a bar and a short-circuit ring may be integrally formed by copper die casting. It is considered. However, the former is inefficient in assembling work, and the latter is poor in productivity because it needs to be heated to a very high temperature, for example, 1000 ° C. or more in order to dissolve copper. Further, when copper die casting, there is a problem that the rotor core constituting the rotor is not practical because it may be distorted by this high heat. For this reason, a cage rotor is considered in which the entire cage is not formed by welding or copper die casting, but a copper-based material is used for a portion of the cage and the characteristics of copper and aluminum are combined.

  For example, a fully closed slot is formed on the outer periphery of the rotor core, and a copper-based bar (copper bar) is inserted into the slot from the axial direction of the rotor core, and then an aluminum-based molten metal is inserted into the slot. A cage in which molten metal is poured from one or both sides of the rotor core in the axial direction, the copper bar is wrapped with aluminum-based molten metal, and short-circuit rings made of aluminum-based molten metal are formed at both ends of the rotor core in the axial direction. A shape rotor is considered (for example, see Patent Document 1).

JP-A-7-163107

  However, the method of inserting the copper bar from the axial direction into a large number of slots formed in the rotor iron core is complicated and the work efficiency is poor. In particular, when the rotor core is formed by laminating an annular core material, if the dimensional error of the core material or the slot is large, a step may occur with respect to the axial direction of the slot. In this case, when the copper bar is inserted into the slot from the axial direction of the rotor core, the copper bar is caught by a step in the slot, making it more difficult to insert the copper bar into the slot and improving the assembly of the rotor. Absent.

  An object of the present invention is to provide a rotor of a rotating electrical machine and a rotating electrical machine in which a copper bar can be easily inserted into a slot of a rotor core.

  The rotor of the rotating electrical machine of the present invention has an annular shape and is divided into an inner peripheral side split core and an outer peripheral side split core, and a plurality of slot forming portions are provided in both the split cores. By combining the slot forming portions of the rotor core with a number of slots formed in the circumferential direction, a copper bar made of copper or a copper alloy inserted into the slots of the rotor core, and aluminum die casting The rotor core is formed at both ends in the axial direction, and includes a short-circuit ring that connects and electrically connects the copper bars (invention of claim 1).

  A rotating electrical machine according to the present invention includes a stator in which a stator coil is wound around a stator core, and the rotor according to any one of claims 1 to 8 disposed corresponding to the stator. (Invention of claim 9).

  According to the present invention, the rotor core of the rotor has a configuration in which the inner peripheral side split core and the outer peripheral side split core are combined, and a number of slot forming portions for forming slots of the rotor core in both split cores are provided. Each was provided with a configuration. Thereby, the copper bar can be inserted from the radial direction of the rotor core into the slot forming portion formed in one of the inner peripheral side split core or the outer peripheral side core. A rotor core can be manufactured by combining the split cores. In this way, the copper bar is inserted into the slot from the radial direction, not from the axial direction of the rotor core, so the copper bar can be easily inserted into the slot without being caught by a step in the slot. can do.

The longitudinal cross-sectional view of the rotor which shows the 1st Embodiment of this invention Vertical section of squirrel-cage induction motor Perspective view showing a part of the rotor broken away Partial enlarged view of FIG. Longitudinal section of the short-circuited ring part Sectional drawing which follows the 6-6 line of FIG. Cross section of mold for aluminum die casting FIG. 4 equivalent view showing the second embodiment of the present invention FIG. 4 equivalent view showing the third embodiment of the present invention FIG. 4 equivalent view showing the fourth embodiment of the present invention Sectional drawing which follows the 11-11 line in FIG. Front view of rotor core FIG. 4 equivalent view showing the fifth embodiment of the present invention Sectional drawing which follows the 14-14 line in FIG. Figure equivalent to FIG. FIG. 4 equivalent view showing the sixth embodiment of the present invention

Hereinafter, the present invention is applied to a rotor of a squirrel-cage induction motor and a squirrel-cage induction motor, and the first embodiment will be described with reference to FIGS.
As shown in FIG. 2, the double squirrel-cage induction motor (rotary electric machine) 1 according to the present embodiment includes a stator 2 and a rotor 3 located on the inner peripheral side of the stator 2.

  The stator 2 is configured by mounting a plurality of stator coils 5 on a stator core 4. The stator core 4 is formed in a cylindrical shape by laminating a plurality of annular cores made of silicon steel plates, and the stacking direction is integrally bound by a rivet (not shown). A plurality of slots 6 for accommodating the stator coil 5 are formed on the inner peripheral surface of the stator core 4.

  As shown in FIGS. 1 to 5, the rotor 3 includes a rotor core 8 having an annular shape and a large number of slots 7 formed on the outer periphery, and copper or copper alloy provided in the slots 7. The bar 9 and the aluminum bar 10 made of aluminum or aluminum alloy, the annular short-circuit rings 11 and 11 (see FIGS. 3 and 5) provided at both axial ends of the rotor core 8, and the rotor core 8 And a rotating shaft 12 provided through the central portion in the axial direction.

  As shown in FIGS. 1 and 4, the rotor core 8 is configured by combining an annular inner peripheral side split core 15 and an annular outer peripheral side split core 16. The inner circumferential side divided core 15 is an iron core positioned on the inner circumferential side when the rotor core 8 is divided into a plurality of radial cores, in this case, divided into two, as viewed from the axial direction. On the other hand, the outer peripheral side split core 16 is an iron core that constitutes the outer periphery of the rotor core 8, that is, the core excluding the inner peripheral side split core 15 from the rotor core 8. The inner peripheral side split core 15 and the outer peripheral side split core 16 are each configured by laminating a plurality of annular cores made of silicon steel plates in the axial direction.

  A large number (24 in this case) of slot forming portions 17 are provided at equal intervals in the circumferential direction on the outer peripheral side of the inner peripheral divided core 15. The slot forming portion 17 is a substantially rectangular cut-out hole, and the outer peripheral side of the inner peripheral divided core 15 is open. The slot forming portion 17 constitutes a part of a copper bar storage portion that stores the copper bar 9. In addition, auxiliary slots 18 that form annular holes are formed in the inner peripheral divided core 15 on the inner peripheral side of the slot forming portions 17.

  On the inner peripheral side of the outer peripheral side split core 16, the same number of slot forming portions 19 as the slot forming portions 17 of the inner peripheral side split core 15 are provided at equal intervals in the circumferential direction. As shown in FIG. 4, the slot forming portion 19 is located on the outer peripheral side of the copper bar storage portion 19A having a substantially rectangular hole that is open on the inner peripheral side of the outer peripheral side split core 16 and on the outer peripheral side of the copper bar storage portion 19A. And an aluminum bar storage portion 19B having a substantially triangular hole cut out, and a slit portion 19C communicating the copper bar storage portion 19A and the aluminum bar storage portion 19B. The copper bar storage portion 19 </ b> A constitutes a copper bar storage portion that stores the copper bar 9 together with the slot forming portion 17. That is, when the inner peripheral side split core 15 and the outer peripheral side split core 16 are combined, the slot forming portion 17 and the copper bar storage portion 19A of the slot forming portion 19 are connected to form the slot 7 for storing the copper bar 9. It is the structure to form. The aluminum bar storage portion 19 </ b> B is provided so that one of the triangular vertices is positioned on the outermost peripheral side of the outer peripheral divided core 16. The slit portion 19C extends from the center in the circumferential direction of the copper bar storage portion 19A toward the center of the aluminum bar storage portion 19B. Thereby, the slot formation part 19 becomes a constricted form between 19 A of copper bar accommodating parts and the aluminum bar accommodating part 19B, when the outer peripheral side division | segmentation iron core 16 is seen from an axial direction. An auxiliary slot 20 forming an annular hole is formed between the slot forming portions 19 and 19 adjacent to each other in the circumferential direction of the outer peripheral side divided core 16.

  As described above, the copper bar 9 is inserted into the slot 7 of the rotor core 8, in this case, the space formed by the slot forming portion 17 and the copper bar accommodating portion 19 </ b> A of the slot forming portion 19. The copper bar 9 is configured by stacking a plurality of copper plates or copper (copper alloy) thin sheets extending parallel to the axial direction of the rotor core 8.

  The aluminum bar 10 is provided in an aluminum bar storage portion 19B located on the outer peripheral side of the copper bar 9. Here, when the cross-sectional area of the aluminum bar storage portion 19B is large, the cross-sectional area of the aluminum bar 10 is also large. Further, the aluminum bar 10 has a gap between the slot forming portion 17 of the inner peripheral side divided core 15 and the copper bar 9 accommodated in the slot forming portion 17, and a copper bar accommodating portion of the slot forming portion 19 of the outer peripheral side divided core 16. A gap between 19A and the copper bar 9 accommodated in the copper bar accommodating portion 19A is also provided depending on the width of the gap. The aluminum bar 10 is also provided in the slit portion 19C when the width of the gap of the slit portion 19C is large.

  In the rotor core 8, an auxiliary aluminum bar 21 made of the same material as that of the aluminum bar 10 is provided in the auxiliary slot 18 of the inner circumferential side divided core 15. Further, an auxiliary aluminum bar 22 made of the same material as that of the aluminum bar 10 is provided in the auxiliary slot 20 of the outer peripheral side divided core 16.

Short-circuiting rings 11 and 11 are located at both ends of the aluminum bar 10 in the axial direction and both ends of the auxiliary aluminum bars 21 and 22 in the axial direction. 1, 2, and 4 indicate the position of the short-circuit ring 11. The short-circuit ring 11 has an annular shape, the outer peripheral side substantially coincides with the outer periphery of the rotor core 11, and the inner peripheral side is located at the same position as the auxiliary aluminum bar 21 or inside the auxiliary aluminum bar 21. As shown in FIG. 3, a plurality of cooling fins 23 projecting outward in the axial direction are integrally formed on the surface of the short-circuiting ring 11 on the outer side in the axial direction.
In the rotor 3 having such a configuration, the aluminum bar 10, the short-circuit ring 11, the auxiliary aluminum bars 21, 22 and the cooling fins 23 are integrally formed by aluminum die casting.

FIG. 7 shows a mold 31 used for the aluminum die casting. The mold 31 has a space for accommodating the rotor core 8 in the mold 31, and includes plates 32 and 32 that open on the axial direction side of the rotor core 8. The plate 32 is formed with a cavity 33 for forming the short ring 11 and the cooling fin 23 in the rotor core 8. The plate 32 is formed with a runner (flow path) 34 for sending an aluminum-based molten metal (not shown) from the outside of the mold 31 to the cavity 33.
A gate (small hole) 35 at the tip of the runner 34 faces the cavity 33 corresponding to the short-circuit rings 11 and 11.

Next, the manufacturing procedure of the rotor 3 will be described.
First, the copper bar 9 is inserted from the radially outer side of the inner peripheral side split core 15 into the slot forming portion 17 of the inner peripheral side split core 15 which is one split core formed by stacking iron core materials. The inserted copper bar 9 is temporarily fixed so as not to be detached from the slot forming portion 17.

  Next, on the outer peripheral side of the inner peripheral side split core 15 in which the copper bar 9 is inserted into the slot forming portion 17, the outer peripheral side split core 16, which is the other split core configured by stacking iron core materials, is viewed from the axial direction. Fit. At this time, the slot forming portion 17 of the inner peripheral side divided iron core 15 and the copper bar storage portion 19A of the slot forming portion 19 of the outer peripheral side divided iron core 16 are aligned to fit into the slot 7. As a result, the copper bar 9 is inserted into the slot 7.

Next, the rotor core 8 in which the copper bar 9 is inserted into the slot 7 is placed at a predetermined position of the mold 31 shown in FIG. 7, and an aluminum-based molten metal, in this case, molten aluminum is placed in the mold 31. The aluminum die cast molding is performed by supplying and filling the cavity 33 from the runner 34.
The aluminum-based molten metal supplied from the runner 34 forms the short ring 11 and the cooling fins 23 and further flows into the slot 7 and the auxiliary slots 18 and 20 of the rotor core 8, and FIGS. 1 to 4 and 6. As shown, the aluminum bar 10 and the auxiliary aluminum bars 21 and 22 are formed.

  The aluminum bar 10, the short ring 11 and the auxiliary aluminum bars 21 and 22 are integrally formed by such aluminum die casting, so that they are firmly connected to each other and are also electrically connected. . Further, as shown in FIG. 5, the copper bar 9 inserted into the slot 7 is connected at both ends in the axial direction by a short-circuit ring 11 and is also electrically connected. In FIG. 5, the hatched lines indicating the cross section of the short-circuit ring 11 are omitted for simplification of the drawing.

  After the aluminum die casting, the mold 31 is opened, and the rotor core 8 formed with the aluminum bar 10, the short ring 11, the auxiliary aluminum bars 21, 22 and the cooling fins 23 is removed. After the rotor core 8 is removed, the rotary shaft 12 is inserted into and fixed to the rotor core 8 to complete the manufacture of the rotor 3.

  According to the above configuration, the double squirrel-cage induction motor 1 in which the copper bar 9 is inserted into each slot 7 and the aluminum bar 10 is provided in the aluminum bar storage portion 19B located on the outer peripheral side of the copper bar 9 is provided. The rotor 3 can be obtained.

  In the rotor 3, current flows mainly to the aluminum bar 10 positioned on the outer peripheral side of the copper bar 9 of the rotor core 8 at start-up, and the copper of low resistance is mainly used during operation at the rated speed (during continuous operation). The bar 9 flows. As a result, a large starting torque can be obtained by concentrating the current on the high-resistance aluminum bar 10 at the start, and a low-loss rotation can be obtained by flowing a current through the low-resistance copper bar 9 during operation at the rated speed. Child 3 can be obtained.

  In the present embodiment, the rotor core 8 of the rotor 3 is configured by combining the inner peripheral side split core 15 and the outer peripheral side split core 16, and the inner peripheral side split core 15 and the outer peripheral side split core 16 are connected to the rotor. A large number of slot forming portions 17 and 19 for forming the slot 7 of the iron core 8 are provided. Thereby, the copper bar 9 can be inserted into the slot forming portion 17 formed in the inner peripheral side split core 15 from the radial direction of the rotor core 8, and the copper is inserted into the slot forming portion 17 of the inner peripheral side split core 15. In a state where the bar 9 is inserted, the rotor core 8 can be manufactured by combining the outer peripheral side split core 16 with the inner peripheral side split core 15. Thus, the copper bar 9 can be inserted into the slot 7 not from the axial direction of the rotor core 8 but from the radial direction. Thereby, even if there is a step in the slot 7, the copper bar 9 is not caught by the step in the slot 7, and the copper bar 9 can be easily inserted into the slot 7.

  When the rotor core 8 rotates and centrifugal force is generated in the rotor core 8, the outer peripheral side split core 16, particularly the thin part in the radial direction of the outer peripheral side split core 16 (the aluminum bar housing of the outer peripheral side split core 16 is accommodated). The portion 19B and the outer peripheral surface) may be damaged. However, as in the present embodiment, the inner peripheral side split core 15 and the outer peripheral side split core 16 are sandwiched between the auxiliary aluminum bars 21 and 22, so that the outer peripheral side split core 16 is moved outward by centrifugal force. It can prevent that it is pushed and can prevent that the outer periphery side division | segmentation iron core 16 breaks.

Next, a second embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the same part as the said 1st Embodiment, and the detailed description is abbreviate | omitted.
In the second embodiment, as shown in FIG. 8, the rotor core 40 is configured by combining an inner peripheral side split core 41 and an outer peripheral side split core 42. That is, in the second embodiment, the shapes of the inner peripheral side split core 41 and the outer peripheral side split core 42 are different from the shapes of the inner peripheral side split core 15 and the outer peripheral side split core 16 of the first embodiment.

  The inner peripheral side split core 41 is provided with a slot forming portion 43 instead of the slot forming portion 17 of the first embodiment. A large number of slot forming portions 43 are provided on the outer peripheral side of the inner peripheral divided iron core 41, in this case, 24 locations at equal intervals in the circumferential direction. And this slot formation part 43 is a hole with which the outer peripheral side was open | released, and the opening distance of the circumferential direction is narrowed toward the outer peripheral side. The slot forming portion 43 constitutes a part of a copper bar storage portion that stores the copper bar 9. Further, the gap between the slot forming portion 43 and the copper bar 9 becomes wider toward the inner peripheral side, and aluminum is provided in this widened space. The aluminum provided in this space functions as an auxiliary aluminum bar 44.

  The outer peripheral side split iron core 42 is provided with a slot forming portion 45 instead of the slot forming portion 19 of the first embodiment. The same number of slot forming portions 45 as the slot forming portions 43 of the inner peripheral side split core 41 are provided at equal intervals in the circumferential direction on the outer peripheral side of the outer peripheral side split core 42.

  The slot forming part 45 includes a copper bar storage part 45A, an aluminum bar storage part 19B having a substantially triangular hole cut out on the outer peripheral side of the copper bar storage part 45A, a copper bar storage part 45A and an aluminum bar. The slit portion 19C communicates with the storage portion 19B. The copper bar storage portion 45A is a hole that is open on the inner peripheral side and has a smaller opening distance in the circumferential direction toward the inner peripheral side. The copper bar storage portion 45 </ b> A constitutes a copper bar storage portion that stores the copper bar 9 together with the slot forming portion 43. Further, the gap between the copper bar storage portion 45A of the slot forming portion 45 and the copper bar 9 becomes wider toward the outer peripheral side, and aluminum is provided in this widened space. The aluminum provided in this space functions as the auxiliary aluminum bar 46.

  Here, when the inner peripheral side split core 41 and the outer peripheral side split core 42 are combined, the slot forming portion 43 and the copper bar storage portion 45A of the slot forming portion 45 are connected to form the slot 47. Further, the slot forming portion 45 is constricted between the copper bar storage portion 45A and the aluminum bar storage portion 19B when the outer peripheral side split core 42 is viewed from the axial direction.

  The copper bar 9 is inserted into the slot 47 of the rotor core 40. At this time, the copper bar 9 is disposed so as to be sandwiched between the opening portion of the inner peripheral side split core 41 and the opening portion of the outer peripheral side split core 42. The aluminum bar 10 is formed at the aluminum bar storage part 19B of the slot forming part 45.

Next, the manufacturing procedure of the rotor 3 provided with the rotor core 40 will be described.
First, the copper bar 9 is inserted into the slot forming portion 43 of the inner peripheral side split core 41 from the radially outer side of the inner peripheral side split core 41. Next, the outer peripheral side split core 42 is fitted from the axial direction on the outer peripheral side of the inner peripheral side split core 41 in which the copper bar 9 is inserted into the slot forming portion 43. At this time, the slot forming portion 43 of the inner peripheral side divided iron core 41 and the copper bar storage portion 45A of the slot forming portion 45 of the outer peripheral side divided iron core 42 are aligned so as to form a slot 47. As a result, the copper bar 9 is inserted into the slot 47.

Next, the rotor core 8 in which the copper bar 9 is inserted into the slot 47 is subjected to aluminum die casting using a mold 31 (see FIG. 7). The aluminum bar 10, the short ring 11, the cooling fin 23, and the auxiliary aluminum bars 44 and 46 are integrally formed by aluminum die casting.
The aluminum bar 10, the short-circuiting ring 11, and the auxiliary aluminum bars 44 and 46 are integrally formed by such aluminum die casting, so that they are firmly connected to each other and electrically connected. Become.

  According to this configuration, the same effects as the first embodiment can be obtained, and the inner peripheral side split core 41 and the outer peripheral side split core 42 are sandwiched and held by the auxiliary aluminum bars 44 and 46. Further, the outer peripheral side split core 42 can be prevented from being pushed to the outer peripheral side by centrifugal force, and the outer peripheral side split core 42 can be prevented from being damaged.

Next, a third embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the same part as the said 1st Embodiment, and the detailed description is abbreviate | omitted.
In the third embodiment, as shown in FIG. 9, the rotor core 50 is configured by combining an inner peripheral side split core 51 and an outer peripheral side split core 52. That is, in the third embodiment, the shapes of the inner peripheral side split core 51 and the outer peripheral side split core 52 are different from the shapes of the inner peripheral side split core 15 and the outer peripheral side split core 16 of the first embodiment.

  The inner peripheral side split iron core 51 has an annular shape, and a plurality of outer peripheral portions, in this case 24 locations, are provided with engaging portions 53 that protrude outward. The engaging portion 53 has an anchor shape in which the distal end portion on the outer peripheral side is wider in the circumferential direction than the proximal end portion on the inner peripheral side. The outer peripheral surface on the distal end side of the engaging portion 53 constitutes a part of the copper bar storage portion that stores the copper bar 9.

  The outer peripheral side split iron core 52 is provided with a slot forming portion 54 instead of the slot forming portion 19 of the first embodiment. The slot forming parts 54 are provided on the outer peripheral side of the outer peripheral side split core 52 at the same number as the engaging parts 53 of the inner peripheral side split core 51 in the circumferential direction.

  The slot forming portion 54 includes an engaged portion 55 formed on the inner peripheral side, a copper bar storage portion 54A formed on the outer peripheral side of the engaged portion 55, and an outer peripheral side of the copper bar storage portion 54A. It is formed of an aluminum bar storage portion 19B that is positioned and has a substantially triangular hole, and a slit portion 19C that communicates the copper bar storage portion 54A and the aluminum bar storage portion 19B.

  The engaged portion 55 has a shape that engages with the engaging portion 53. Specifically, the engaged portion 55 has a shape that is recessed from the inner peripheral side of the outer peripheral side split core 52 toward the outer peripheral side, and the bottom of the recess is wider in the circumferential direction than the opening side. That is, the recessed opening is formed to be the narrowest, and the opening is located on the inner peripheral side of the outer peripheral divided core 52. The copper bar storage portion 54A is a hole having a substantially rectangular shape that is recessed in a substantially rectangular shape from the bottom of the engaged portion 55 to the outer peripheral side and is open on the engaged portion 55 side. The copper bar storage portion 54 </ b> A constitutes a part of the copper bar storage portion that stores the copper bar 9.

  Here, when the inner peripheral side split core 51 and the outer peripheral side split core 52 are combined, a slot 56 surrounded by the engaging portion 53 and the slot forming portion 54 is formed. At this time, the gap between the copper bar storage portion 54A of the slot forming portion 54 and the copper bar 9 is filled with aluminum. The aluminum in this gap functions as the auxiliary aluminum bar 57. The aluminum bar 10 is formed in the aluminum bar storage portion 19B of the slot forming portion 54.

Next, the manufacturing procedure of the rotor 3 provided with the rotor core 50 will be described.
First, the copper bar 9 is inserted into the copper bar storage portion 54 </ b> A of the slot forming portion 54 of the outer peripheral side split core 52 from the radially inner side of the outer peripheral side split core 52. Next, the inner peripheral side split core 51 is fitted from the axial direction on the inner peripheral side of the outer peripheral side split core 52 in which the copper bar 9 is inserted into the copper bar storage portion 54A of the slot forming portion 54. At this time, the engaging part 53 of the inner peripheral side split core 51 and the engaged part 55 of the outer peripheral side split core 52 are engaged, and the inner peripheral side split core 51 and the outer peripheral side split core 52 are firmly coupled. In addition, the copper bar 9 is inserted into the slot 56 surrounded by the engaging portion 53 and the slot forming portion 54.

  Next, the rotor core 50 in which the copper bar 9 is inserted into the slot 56 is subjected to aluminum die casting using a mold 31 (see FIG. 7). The aluminum bar 10, the short ring 11, the cooling fin 23, and the auxiliary aluminum bar 57 are integrally formed by aluminum die casting. By such aluminum die casting, the aluminum bar 10, the short ring 11 and the auxiliary aluminum bar 57 are electrically connected.

According to this configuration, the same operational effects as those of the first embodiment can be obtained, and the inner peripheral side split core 51 and the outer peripheral side split core 52 are engaged by the engagement portion 53 and the engaged portion 55. Since it is firmly coupled, it is possible to prevent the outer peripheral side split core 52 from being pushed to the outer peripheral side by centrifugal force, and to prevent the outer peripheral side split core 52 from being damaged.
Further, since the auxiliary aluminum bar 57 is positioned around the copper bar 9, the mechanical strength of the auxiliary aluminum bar 57 can be increased.

Next, a fourth embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the same part as the said 1st Embodiment, and the detailed description is abbreviate | omitted.
In the fourth embodiment, as shown in FIGS. 10 and 11, the rotor core 60 is configured by combining an inner peripheral side split core 61 and an outer peripheral side split core 62. That is, in the fourth embodiment, the shapes of the inner peripheral side split core 61 and the outer peripheral side split core 62 are different from the shapes of the inner peripheral side split core 15 and the outer peripheral side split core 16 of the first embodiment.

  As shown in FIG. 12 (a), the inner peripheral side split core 61 is substantially the same shape as the inner peripheral side split core 15 of the first embodiment. Twenty-four slots forming portions 63 are provided at equal intervals in the circumferential direction. The slot forming portion 63 is a substantially rectangular cut-out hole, and the outer peripheral side of the inner peripheral divided iron core 61 is open. The slot forming part 63 constitutes a part of a copper bar storage part for storing the copper bar 9.

As shown in FIGS. 10 to 12, the outer peripheral side divided iron core 62 is configured by combining and laminating a first iron core material 621 and a second iron core material 622.
The first iron core material 621 has an annular shape, and a slot forming portion 64 is provided on the inner peripheral side. The slot forming portions 64 are provided on the inner peripheral side of the first iron core material 621 in the same number as the slot forming portions 63 formed in the inner peripheral divided core 61 and at equal intervals in the circumferential direction.

  Here, the slot forming portion 64 of the first iron core material 621 includes a copper bar storage portion 64A that forms a substantially rectangular hole opened on the inner peripheral side of the outer peripheral side divided core 62, and a circumferential direction from the copper bar storage portion 64A. And an aluminum bar storage portion 64B formed so as to extend in one direction (rightward in FIG. 12A). Specifically, the aluminum bar storage portion 64B is a triangular hole, and the vertex located on the outermost circumferential side is located on the one direction side of the outermost circumferential direction.

  The second iron core material 622 has an annular shape, and a slot forming portion 65 is provided on the inner peripheral side. The same number of slot forming portions 65 as the slot forming portions 64 are provided at equal intervals in the circumferential direction. The slot forming portion 65 of the second iron core material 622 includes a copper bar storage portion 65A and aluminum formed so as to extend from the copper bar storage portion 65A in the other circumferential direction (leftward in FIG. 12B). It is formed from the bar storage portion 65B. The copper bar storage portion 65A is a hole having the same shape as that of the copper bar storage portion 64A, and has a substantially rectangular hole that is open on the inner peripheral side of the outer peripheral divided iron core 62. Specifically, the aluminum bar storage portion 65B is a triangular hole, and the apex located on the outermost circumferential side is located on the other side in the most circumferential direction. The second iron core material 622 has the same shape as that obtained by inverting the first iron core material 621.

  The slot 66 is formed by matching the copper bar storage portion 64A of the slot forming portion 63 of the first iron core material 621 with the copper bar storage portion 65A of the slot forming portion 65 of the second iron core material 622. The When viewed from the axial direction, the slot 66 has the same copper bar storage portions 64A and 65A, and the aluminum bar storage portions 64B and 65B located on the outer peripheral side of the outer peripheral split core 62 are arranged in the circumferential direction depending on the stacking position. (See FIGS. 10 and 11).

  A slot forming portion 63 of the inner peripheral side split core 61, a copper bar storing portion 64 A of the slot forming portion 63 of the first iron core material 621, and a copper bar storing portion 65 A of the slot forming portion 65 of the second iron core material 622. A copper bar 9 is inserted into the space formed by

  Aluminum bars 67 are formed in the aluminum bar storage portion 64B and the aluminum bar storage portion 65B. Here, the lower aluminum bar storage portion 64B of the rotor core 60 extends in one circumferential direction, and the upper aluminum bar storage portion 64B of the rotor core 60 extends in the other circumferential direction. The aluminum bar 67 also has a shape in which the lower end extends in one circumferential direction and the upper end extends in the other circumferential direction. That is, the aluminum bar 67 has two steps when viewed from the outer peripheral side of the rotor core 60.

Next, the manufacturing procedure of the rotor 3 provided with the rotor core 60 will be described.
First, the copper bar 9 is inserted into the slot forming portion 63 of the inner peripheral side split core 61 from the radially outer side of the inner peripheral side split core 61. Next, a plurality of first iron core members 621 are fitted and laminated on the outer peripheral side of the inner peripheral side divided iron core 61 in which the copper bar 9 is inserted into the slot forming portion 63, and the second iron core material 621 is stacked thereon. A plurality of core members 622 are fitted from the axial direction and stacked. At this time, the slot forming portion 63 of the inner peripheral side split core 61, the copper bar storing portion 64A of the slot forming portion 64 of the first iron core material 621, and the copper bar storing of the slot forming portion 65 of the second iron core material 622 are stored. The slot 66 is formed by matching the portion 65A. As a result, the copper bar 9 is inserted into the slot 66. Further, the lower part of the rotor core 60 has an aluminum bar storage part 64B extending in one direction in the circumferential direction, and the upper part of the rotor core 60 has an aluminum bar storage part 64B extending in the other direction in the circumferential direction. It becomes like this.

  Next, the rotor core 60 in which the copper bar 9 is inserted into the slot 66 is subjected to aluminum die casting using the mold 31 (see FIG. 7). The short ring 11, the cooling fin 23, and the aluminum bar 67 are integrally formed by aluminum die casting.

  According to this configuration, the short-circuit ring 11 and the aluminum bar 67 are integrally formed by aluminum die casting, so that they are firmly connected to each other and are also electrically connected. Furthermore, since the aluminum bar 67 has two steps, that is, a pseudo inclination when viewed from the outer peripheral side of the rotor core 60, the aluminum bar 67 of the rotor core 60 has a pseudo inclination. It functions as a pseudo skew and can reduce torque unevenness.

Next, a fifth embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the same part as the said 4th Embodiment, and the detailed description is abbreviate | omitted.
In the fifth embodiment, as shown in FIGS. 13 and 14, the rotor core 70 is configured by combining an inner peripheral side split core 71 and an outer peripheral side split core 72. That is, in the fifth embodiment, the shapes of the inner peripheral side split core 71 and the outer peripheral side split core 72 are different from the shapes of the inner peripheral side split core 61 and the outer peripheral side split core 62 of the fourth embodiment.

  As shown in FIG. 15, the inner peripheral side split core 71 has an annular shape, and a large number, in this case, 24 places, slot forming portions 73 are provided at equal intervals in the circumferential direction on the outer peripheral side. The slot forming portion 73 is a substantially rectangular cut-out hole, and the outer peripheral side of the inner peripheral divided iron core 71 is open. The slot forming portion 73 constitutes a part of a copper bar storage portion that stores the copper bar 9. And this slot formation part 73 is formed so that the length of the open circumferential direction is wider than the circumferential length of the copper bar accommodated. For example, when the circumferential length of the copper bar 9 is 100%, the circumferential length of the slot forming portion 73 is set to 120%. The inner peripheral side divided iron core 71 is configured by laminating a plurality of annular iron core materials 711.

  The outer peripheral side split iron core 72 has an annular shape, and a slot forming portion 74 is provided on the inner peripheral side. The same number of slot forming portions 74 as the slot forming portions 73 formed in the inner peripheral side split core 71 are provided at equal intervals in the circumferential direction on the inner peripheral side of the outer peripheral side split core 72.

  The slot forming portion 74 includes a copper bar storage portion 74A that forms a substantially rectangular hole that opens on the inner peripheral side of the outer peripheral side split core 72, and an aluminum bar that extends from the copper bar storage portion 74A to the outer peripheral side and forms a substantially triangular hole. The storage part 74B is formed. The copper bar storage portion 74 </ b> A is configured to form a slot 75 by connecting to the slot forming portion 73 of the inner peripheral side split core 71 when the inner peripheral side split core 71 and the outer peripheral side split core 72 are combined. And the copper bar storage part 74A of this slot formation part 74 is the same as the circumferential length of the slot formation part 73 in the open circumferential direction length. That is, the circumferential length of the copper bar storage portion 74A is set to 120% when the circumferential length of the copper bar 9 is 100%.

  And since the copper bar accommodating part 74A of the slot formation part 73 and the slot formation part 74 is formed wider than the length of the circumferential direction of the copper bar 9, the inner peripheral side division | segmentation iron core 71 is formed. In the state where the copper bar 9 is inserted into the slot 75 formed by the slot forming portion 73 and the slot forming portion 74 of the outer peripheral side split core 72, the inner peripheral side split core 71 and the outer peripheral side split core 72 can be shifted. It is.

  In the present embodiment, the outer peripheral side split core 72 is configured by stacking a plurality of annular core members 721. Then, the lower stage portion of the rotor core 70 is appropriately moved (shifted) in the right direction, and the upper stage portion is appropriately moved (shifted) in the left direction. Thereby, when viewed from the outer peripheral side of the rotor core 70, the lower portion of the aluminum bar storage portion 74B is positioned in one circumferential direction (rightward in FIG. 13) with the stored copper bar 9 as a reference. The upper stage is located in the other direction in the circumferential direction (left direction in FIG. 13). And it is in the position which shifted | deviated 20% in the circumferential direction of the copper bar 9 on the basis of the accommodated copper bar 9, and the two level | step difference is formed. An aluminum bar 76 is formed in the aluminum bar storage portion 74B of the two steps. That is, the aluminum bar 76 has two steps.

Next, the manufacturing procedure of the rotor 3 provided with the rotor core 70 will be described.
First, the copper bar 9 is inserted into the slot forming portion 73 of the inner peripheral side split core 71 from the radially outer side of the inner peripheral side split core 71. Next, a plurality of outer peripheral side split cores 72 are fitted and laminated from the axial direction on the outer peripheral side of the inner peripheral side split core 71 inserted into the slot forming portion 73. At this time, the copper bar 9 is inserted into a slot 75 formed by the slot forming portion 73 of the inner peripheral side split core 71 and the copper bar storage portion 74A of the slot forming portion 74 of the outer peripheral side split core 72.

  Next, in a state where the copper bar 9 is inserted into the slot 75, the inner peripheral side split core 71 and the rotor core 70 are moved to the right and the upper stage is moved to the left. The outer peripheral side split iron core 72 is shifted in the circumferential direction to form a step in the axial direction in the aluminum bar storage portion 74B.

  Next, the rotor core 70 is die-casted with an aluminum die 31 (see FIG. 7). The short ring 11, the cooling fin 23, and the aluminum bar 76 are integrally formed by aluminum die casting. Since the aluminum bar 76 has a step formed in the aluminum bar storage portion 74B, the step is formed to follow this step.

  According to this configuration, the aluminum bar 76 has two steps when viewed from the outer peripheral side of the rotor core 70. Therefore, the aluminum bar 76 portion of the rotor core 70 has a pseudo skew. It functions and can reduce torque unevenness.

Next, a sixth embodiment of the present invention will be described with reference to FIG. The same parts as those in the fifth embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
In the sixth embodiment, the present invention is applied to a rotor having two copper bars arranged side by side in the radial direction of the rotor core. That is, the present invention is applied to a rotor of a triple squirrel-cage induction motor having one aluminum bar and two copper bars.

  A rotor core 80 used in this rotor is configured by combining an inner peripheral side split core 81 and an outer peripheral side split core 82. That is, in the sixth embodiment, the shapes of the inner peripheral side split core 81 and the outer peripheral side split core 82 are different from the shapes of the inner peripheral side split core 71 and the outer peripheral side split core 72 of the fifth embodiment.

The inner peripheral side split core 81 is configured by combining an inner peripheral side core portion 83 and an outer peripheral side core portion 84 obtained by dividing the inner peripheral side split core 81 into two in the radial direction.
The inner peripheral side iron core portion 83 has an annular shape, and a large number, in this case, 24 locations, and second slot forming portions 85 are provided at equal intervals in the circumferential direction on the outer peripheral side. The second slot forming portion 85 is a substantially rectangular cut-out hole, and the outer peripheral side of the inner peripheral iron core portion is open. The second slot forming portion 85 constitutes a part of the second copper bar storage portion that stores the second copper bar 86.

  The outer peripheral side core portion 84 has an annular shape, and the same number of second slot forming portions 87 as the second slot forming portions 85 formed in the inner peripheral side core portion 83 are equally spaced in the circumferential direction on the inner peripheral side. Is provided. The second slot forming portion 87 is a substantially rectangular cut-out hole, and the inner peripheral side of the outer peripheral side iron core portion 84 is open. The second slot forming portion 87 constitutes a part of the second copper bar storing portion for storing the second copper bar 86 and is connected to the second slot forming portion 85 of the inner peripheral iron core portion 83. Thus, the second slot 88 is formed. Further, the same number of first slot forming portions 89 as the second slot forming portions 85 are provided at equal intervals in the circumferential direction on the outer peripheral side of the outer peripheral side iron core portion 84. The first slot forming part 89 is a substantially rectangular cut-out hole, and the outer peripheral side of the outer peripheral side core part 84 is open. The first slot forming portion 89 constitutes a part of the first copper bar storage portion that stores the copper bar (first copper bar) 9.

  The outer peripheral side divided iron core 82 has an annular shape, and a first slot forming portion 90 is provided on the inner peripheral side. The same number of first slot forming portions 90 as the first slot forming portions 89 are provided at equal intervals in the circumferential direction on the inner peripheral side of the outer peripheral divided core 82.

  The first slot forming portion 90 includes a copper bar storage portion 90A that forms a substantially rectangular hole that opens on the inner peripheral side of the outer peripheral divided core 82, and a substantially triangular hole extending from the copper bar storage portion 90A to the outer peripheral side. The formed aluminum bar storage portion 90B. The copper bar storage portion 90 </ b> A is connected to the first slot forming portion 89 to form the first slot 91 when the outer peripheral side core portion 84 and the outer peripheral side split core 82 of the inner peripheral side split core 81 are combined. . The aluminum bar storage portion 90 </ b> B is provided so that one of the triangular vertices is located on the outermost peripheral side of the outer peripheral divided core 82.

  A second copper bar 86 is accommodated in the second slot 88 formed from the second slot forming portions 85 and 87, and the first slot forming portion 89 and the first slot forming portion 90 The first copper bar 9 is accommodated in the first slot 91 formed from the copper bar accommodating portion 90A. The aluminum bar storage portion 90B is formed with an aluminum bar 92 connected to the short-circuit rings 11 and 11 by aluminum die casting.

Next, the manufacturing procedure of the rotor provided with the rotor core 80 will be described.
First, the second copper bar 86 is inserted into the second slot forming portion 85 of the inner peripheral iron core portion 83 of the inner peripheral iron core portion 81 from the radially outer side of the inner peripheral iron core portion 83. Next, the outer peripheral side core portion 84 is fitted from the axial direction on the outer peripheral side of the inner peripheral side core portion 83 in which the second copper bar 86 is inserted into the second slot forming portion 85. At this time, the second copper bar 86 is formed by the second slot forming portion 85 of the inner peripheral side core portion 83 and the second slot forming portion 87 of the outer peripheral side core portion 84. It becomes the structure inserted in.

  Next, the first copper bar 9 is inserted into the first slot forming portion 89 of the outer peripheral side core portion 84 of the inner peripheral side divided core 81 from the outer side in the radial direction of the outer peripheral side core portion 84. Then, the outer peripheral side divided core 82 is fitted from the axial direction on the outer peripheral side of the outer peripheral side core portion 84 inserted into the first slot forming portion 89. At this time, the first copper bar 9 is composed of the first slot forming portion 89 of the outer peripheral side core portion 84 and the first copper bar storage portion 90A of the first slot forming portion 90 of the outer peripheral side split core 82. The first slot 91 to be formed is inserted.

  Next, aluminum die-casting is performed on the rotor core 80 by using a mold 31 (see FIG. 7). The short ring 11, the cooling fin 23, and the aluminum bar 92 are integrally formed by aluminum die casting.

  According to this configuration, the rotor core 80 having two copper bars 9 and 86 arranged in the radial direction can be manufactured by dividing the rotor core 80 into three in the radial direction. That is, a rotor core having a configuration in which a plurality of copper bars are provided in the radial direction can be manufactured by appropriately changing the number of divisions in the radial direction of the rotor core.

The present invention is not limited to the embodiment described above and shown in the drawings, and the following modifications and expansions are possible.
In the first, second, fourth, fifth and sixth embodiments, the copper bar is inserted into the slot forming portion of the inner peripheral side split core, and then the outer peripheral side split core is inserted. A configuration may be adopted in which the copper bar is inserted into the slot forming portion of the iron core, and then the inner peripheral side divided iron core is inserted and combined.
An auxiliary slot similar to that of the first embodiment is formed on the inner peripheral side divided core and the outer peripheral side divided core of the second to sixth embodiments, and an auxiliary aluminum bar is formed by aluminum die casting in the auxiliary slot. May be.

In the fourth and fifth embodiments, the aluminum bar is divided into two stages. However, in the fourth embodiment, the number of stacked layers is appropriately changed, and in the fifth embodiment, the number of sheets shifted in the circumferential direction is changed. By appropriately changing the shape, the aluminum bar may have a shape having three or more steps.
In addition, the number, dimensions, materials, and the like of the above-described components can be changed as appropriate.

  In the drawings, 1 is a squirrel-cage induction motor (rotary electric machine), 2 is a stator, 3 is a rotor, 4 is a stator core, 5 is a stator coil, 7, 47, 56, 66, 75, 88, 91 are Slots, 8, 40, 50, 60, 70, 80 are rotor cores, 9, 86 are copper bars, 10, 67, 76, 92 are aluminum bars, 11 is a short ring, 15, 41, 51, 61, 71 , 81 is an inner divided iron core, 16, 42, 52, 62, 72, 82 are outer divided iron cores, 17, 19, 43, 45, 54, 63, 64, 65, 73, 74, 85, 87, 89 and 90 are slot forming portions (copper bar storage portions), 18 and 20 are auxiliary slots, 19A, 45A, 54A, 64A, 65A, 74A, 87A, 89A, and 90A are copper bar storage portions, 19B, 64B, 65B, 74B, 90B are aluminum bar storage parts, 21, 22, 4, 46 and 57 are auxiliary aluminum bars, 53 is an engaging portion, 55 is an engaged portion, 621, 622, 711 and 721 are iron core materials, 83 is an inner peripheral side iron core portion, and 84 is an outer peripheral side iron core portion. .

Claims (9)

It has an annular shape and is divided into an inner peripheral side split core and an outer peripheral side split core, and a number of slot forming portions are provided on both split cores. A rotor core in which a number of slots are formed in the direction;
A copper bar made of copper or a copper alloy inserted into the slot of the rotor core;
A rotor of a rotating electrical machine comprising a short-circuit ring formed at both axial ends of the rotor core by aluminum die casting and connecting and electrically connecting the copper bars.   The rotor of the rotating electrical machine according to claim 1, wherein an aluminum bar is formed on an outer peripheral side of the copper bar in each slot by the aluminum die casting. A large number of annular auxiliary slots are formed in the inner peripheral side split core and the outer peripheral side split core,
The rotor of the rotating electrical machine according to claim 2, wherein an auxiliary aluminum bar is formed in each auxiliary slot by the aluminum die casting. The slot forming portion of the inner peripheral side divided core is formed such that the opening distance in the circumferential direction becomes narrower toward the outer peripheral side,
The slot forming portion of the outer peripheral side split iron core is formed such that the opening distance in the circumferential direction becomes narrower toward the inner peripheral side,
The said copper bar is arrange | positioned so that it may be pinched | interposed by the opening part of the slot formation part of the said inner peripheral side division | segmentation iron core, and the opening part of the slot formation part of the said outer periphery side division | segmentation iron core. The rotor of the described rotating electrical machine. An engagement portion protruding in the outer peripheral direction is provided on the outer peripheral surface of the inner peripheral divided iron core,
5. The rotor of a rotating electrical machine according to claim 2, wherein an engaged portion that engages with the engaging portion is provided on an inner peripheral surface of the outer peripheral side divided iron core.   The outer periphery-side split iron core includes a first iron core material having a copper bar housing portion and a slot forming portion formed of an aluminum bar housing portion formed so as to extend in one circumferential direction from the copper bar housing portion; A combination of a bar storage portion and a second iron core material having a slot forming portion formed of an aluminum bar storage portion formed so as to extend from the copper bar storage portion in the opposite direction of the circumferential direction. The rotor of the rotary electric machine according to any one of claims 2 to 5.   The inner peripheral side iron core and the outer peripheral side iron core are formed by laminating iron core materials having slot forming portions wider in the circumferential direction than the accommodated copper bar, and are arranged in a circumferential direction with reference to the accommodated copper bar. The rotor for a rotating electrical machine according to any one of claims 2 to 5, wherein the rotor is configured to be appropriately shifted in a direction and an opposite direction. The inner peripheral side split core is divided into an inner peripheral side core part and an outer peripheral side core part, and a plurality of second slot forming parts are provided in both the core parts, and the second of the both core parts is provided. By combining the slot forming portions, a number of second slots are formed in the circumferential direction,
3. A second copper bar is inserted into the second slot, and the second copper bar is connected to a short-circuit ring formed by the aluminum die casting. The rotor of the rotary electric machine according to any one of 7. A stator in which a stator coil is wound around a stator core;
A rotating electrical machine comprising the rotor according to any one of claims 1 to 8 disposed corresponding to the stator.

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