JP6264203B2 - Rotating electrical machine rotor - Google Patents

Description

  The present invention relates to a rotor of a rotating electrical machine that is mounted on, for example, a vehicle and used as an electric motor or a generator.

  2. Description of the Related Art Conventionally, an electric motor (motor) that uses a cage-shaped rotor in which both ends of a conductor are all short-circuited is known as one type of rotating electrical machine that is mounted and used in a vehicle or the like. And in patent document 1, it consists of a some steel plate laminated | stacked on the shaft and the axial direction, the fitting hole fitted to the outer peripheral surface of a shaft, and the some penetrated to the axial direction and arranged in the circumferential direction. A rotor core having a slot, a pair of end rings arranged on both sides in the axial direction of the rotor core, and a plurality of connecting bars for connecting the pair of end rings through the slot, are integrally formed by casting. And a rotor with a cast conductor.

  The rotor shaft and the rotor core are usually assembled by techniques such as press fitting, shrink fitting, and key fitting. When press-fitting is employed, the press-fitting load can be reduced by knurling the outer peripheral surface of the shaft.

JP 2004-208362 A

  By the way, in the above rotor, when the shaft and the rotor core are assembled by press-fitting or shrink fitting, they are fitted with a predetermined tightening allowance in order to stabilize the fixing force after the assembly. For this reason, there has been a problem in that electromagnetic characteristics are deteriorated by applying compressive stress to the rotor core.

  The present invention has been made in view of the above circumstances, and can reduce the shaft insertion load when fitting and assembling the shaft and the rotor core, sufficiently without applying compressive stress to the rotor core. It is an object to be solved to provide a rotor of a rotating electrical machine that can obtain a sufficient fixing force.

The present invention made to solve the above problems
A shaft (10);
A plurality of steel plates (21) laminated in the axial direction, a fitting hole (22) fitted to the outer peripheral surface of the shaft, and a plurality of slots (23) penetrating in the axial direction and arranged in the circumferential direction A rotor core (20) having:
A pair of end rings (31) arranged on both sides in the axial direction of the rotor core and a plurality of connecting bars (32) for connecting the pair of end rings via the slots are formed integrally by casting. A rotor of a rotating electrical machine comprising a cast conductor (30),
The rotor core is formed of a part of the steel plates of the plurality of steel plates, and has a molten metal introduction passage (24) extending radially inward from the slot and opening to an inner peripheral surface of the rotor core. Have
The casting conductor has a filling portion (33) formed by filling a gap formed between the rotor core and the shaft through a portion of the molten metal during casting through the molten metal introduction passage. It is characterized by having.

  According to the rotor of the rotating electrical machine of the present invention, the cast conductor has a filling portion formed by filling a gap formed between the rotor core and the shaft with a part of the molten metal at the time of casting. . Therefore, when the cast conductor is formed by casting, the filling portion for fixing the rotor core and the shaft can be formed at the same time, so that the shaft is inserted when the shaft and the rotor core are fitted and assembled before the casting process. The load can be reduced or zero. Thereby, since it becomes a structure which can exhibit sufficient fixing force, without giving a compressive stress to a rotor core, the deterioration of an electromagnetic characteristic can be prevented. In addition, since the gap formed between the rotor core and the shaft is filled with a filling portion which is a part of the cast conductor, the thermal conductivity between the rotor core and the shaft is improved, and the heat radiation of the rotor is improved. Can be improved.

  In addition, the code | symbol in the parenthesis after each member and site | part described in this column and the claim shows the correspondence with the specific member and site | part described in embodiment mentioned later, and is a patent. It does not affect the configuration of each claim described in the claims.

It is sectional drawing which follows the axial direction of the rotor of the rotary electric machine which concerns on Embodiment 1, and is the II sectional view taken on the line of FIG. It is the II-II sectional view taken on the line of FIG. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 1. It is sectional drawing which follows the axial direction of the rotor of the rotary electric machine which concerns on Embodiment 2, and is IV-IV sectional view taken on the line of FIG. FIG. 5 is a cross-sectional view taken along line VV in FIG. 4. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 4. It is sectional drawing which follows the axial direction of the rotor of the rotary electric machine which concerns on Embodiment 3, and is VII-VII arrow sectional drawing of FIG. FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 7. It is the IX-IX arrow directional cross-sectional view of FIG. It is sectional drawing which follows the axial direction of the rotor of the rotary electric machine which concerns on Embodiment 4, and is XX arrow sectional drawing of FIG. It is a XI-XI line sectional view taken on the line of FIG. It is XII-XII arrow directional cross-sectional view of FIG.

  Hereinafter, embodiments of a rotor of a rotating electrical machine according to the present invention will be specifically described with reference to the drawings.

Embodiment 1
A rotor 1 of a rotating electrical machine according to a first embodiment will be described with reference to FIGS. The rotor 1 according to the first embodiment is a squirrel-cage rotor mounted on a rotating electrical machine (not shown) used as, for example, a squirrel-cage three-phase motor for a vehicle. As shown in FIG. 1, the rotor 1 includes a shaft 10, a rotor core 20 in which a plurality of steel plates 21 are laminated in the axial direction and fitted and fixed to the outer peripheral surface of the shaft 10, and a pair of end rings. 31, a plurality of connecting bars 32, and a filling portion 33, and a casting conductor 30 integrally formed by casting (aluminum die casting).

  The shaft 10 is formed in a solid cylindrical shape from an iron-based metal, and the central portion except for both end portions in the axial direction is formed with a constant diameter. The portion of the outer peripheral surface of the shaft 10 to which the rotor core 20 is fitted is provided with a concave and convex engaging portion 11 by performing knurling. That is, the outer peripheral surface of the shaft 10 is provided with engaging portions 11 in which a plurality of protruding ridge portions 11a and concave grooves 11b extending in the axial direction are alternately formed in the circumferential direction.

  The rotor core 20 is formed by laminating a plurality of steel plates 21 formed in a predetermined ring shape by punching in the axial direction. In the central portion of the rotor core 20, there is a fitting hole 22 that penetrates in the axial direction and is fitted to the outer peripheral surface of the shaft 10. The diameter of the fitting hole 22 is larger than the diameter of the knurled part (engagement part 11) of the shaft 10 by a predetermined dimension. Thereby, a gap having a predetermined dimension is formed between the rotor core 20 and the protruding portion 11 a of the shaft 10.

  A plurality of (in the present embodiment, 40) slots 23 are provided at the outer peripheral side end of the rotor core 20 and penetrate in the axial direction and are arranged in an annular shape in the circumferential direction. Further, at three locations in the axial direction of the rotor core 20, as shown in FIGS. 1 and 2, it extends radially inward from the slot 23 and opens on the inner peripheral surface (fitting hole 22) of the rotor core 20. A molten metal introduction passage 24 is provided. Four melt introduction passages 24 are provided at 90 ° intervals in the circumferential direction at three axial positions of the rotor core 20. That is, the molten metal introduction passage 24 is provided in four of the 40 slots 23. The molten metal introduction passage 24 is formed of a fitting hole 22 or a slot at the time of punching with respect to about 1 to 3 steel plates 21 located where the molten metal introduction passage 24 should be provided among the plurality of laminated steel plates 21. 23 are formed at the same time.

  The cast conductor 30 includes a pair of ring-shaped end rings 31 disposed on both sides in the axial direction of the rotor core 20 and a plurality of (in the present embodiment, 40 in the present embodiment) that couple the pair of end rings 31 in the axial direction. And a filling portion 33 formed by filling a gap between the rotor core 20 and the shaft 10 with a portion of molten aluminum during casting. In this embodiment, a pure aluminum melt having a small electric resistance is employed.

  The cast conductor 30 is integrally formed with the shaft 10 and the rotor core 20 by performing a setting process and a casting process as described below. First, in the setting step, the rotor core 20 is set in a predetermined position in the cavity of a mold (not shown) forming the cast conductor 30 with the rotor core 20 fitted and assembled to the outer peripheral surface of the shaft 10. Thereafter, the mold is clamped and the next casting process is started.

  In the casting process, molten aluminum is injected at a predetermined pressure into a cavity that forms the end ring 31 on one side in the axial direction of the mold. The injected aluminum melt flows into the slots 23 from the cavities of the end rings 31 and flows in the axial direction, and flows into the cavities forming the end rings 31 on the other axial side of the mold and is filled. It becomes.

  At this time, the molten aluminum flowing into the four slots 23 provided with the molten metal introducing passage 24 flows inward in the radial direction through the molten metal introducing passage 24 and is formed between the rotor core 20 and the shaft 10. It will be in the state where it filled and filled in the gap which was made. Thereby, the filling part 33 is formed by the molten aluminum which flows into the gap between the rotor core 20 and the shaft 10 and is filled. Thereafter, after a predetermined time has elapsed, the molten aluminum solidifies, the mold is opened, the casting (product) is taken out, and the rotor of the first embodiment in which the shaft 10, the rotor core 20, and the cast conductor 30 are integrated. 1 is obtained.

  According to the rotor 1 of the first embodiment configured as described above, in the casting conductor 30, a gap formed between the rotor core 20 and the shaft 10 is filled with a part of the molten metal at the time of casting. It has the filling part 33 formed by this. Therefore, when the casting conductor 30 is formed by casting, the filling portion 33 for fixing the rotor core 20 and the shaft 10 can be formed at the same time, so that the shaft 10 and the rotor core 20 are fitted before the casting process. The shaft insertion load during assembly can be reduced or reduced to zero. Thereby, since it becomes the structure which can exhibit sufficient fixing force, without giving a compressive stress to the rotor core 20, the deterioration of an electromagnetic characteristic can be prevented. In addition, since the gap formed between the rotor core 20 and the shaft 10 is filled with the filling portion 33 that is a part of the cast conductor 30, the thermal conductivity between the rotor core 20 and the shaft 10 is improved. And the heat dissipation of the rotor 1 can be improved.

  Further, in the first embodiment, since the engaging portion 11 formed by knurling the outer peripheral surface of the shaft 10 is provided, the relative displacement in the rotational direction of the shaft 10 and the rotor core 20 can be more reliably performed. Can be regulated. Thereby, the shaft insertion load when the shaft 10 and the rotor core 20 are fitted and assembled can be more advantageously reduced.

  Furthermore, since the engaging part 11 provided in the shaft 10 is constituted by a plurality of convex strips 11a and concave grooves 11b that are alternately arranged in the circumferential direction, the rotational direction of the shaft 10 and the rotor core 20 is determined. The fixing force can be further strengthened.

  In the first embodiment, the rotor core 20 has a molten metal introduction passage 24 that extends radially inward from the slot 23 and opens to the inner peripheral surface (fitting hole 22) of the rotor core 20. Thereby, since the molten metal introduction channel | path 24 can be formed in the minimum magnitude | size, since the quantity of iron of the rotor core 20 can be kept to the maximum, the deterioration of electromagnetic characteristics can be prevented.

  In Embodiment 1, since the material of the cast conductor 30 is pure aluminum having a small electrical resistance, it is possible to ensure good performance of the rotor 1.

[Embodiment 2]
A rotor 2 of a rotating electrical machine according to a second embodiment will be described with reference to FIGS. In the rotor 1 of the first embodiment, the engaging portion 11 is provided only on the shaft 10, whereas the rotor 2 of the second embodiment is a gear / spline type on both the shaft 10 and the rotor core 20. Are different in that the engaging portions 11 and 25 are provided. Therefore, the detailed description about the member and structure which are common in Embodiment 1 is abbreviate | omitted, and a different point and an important point are demonstrated below. In addition, the same code | symbol is used about the member which is common in Embodiment 1. FIG.

  The shaft 10 according to the second embodiment is formed in a solid cylindrical shape from an iron-based metal, and the central portion except for both end portions in the axial direction has a constant diameter. A gear / spline type engagement in which a plurality of ridges 11a and grooves 11b extending in the axial direction are alternately formed in the circumferential direction at a portion where the rotor core 20 on the outer peripheral surface of the shaft 10 is fitted. Part 11 is provided.

  On the other hand, a gear / spline type engaging portion 25 corresponding to the engaging portion 11 provided on the outer peripheral surface of the shaft 10 is provided on the inner peripheral surface of the rotor core 20 fitted on the outer peripheral surface of the shaft 10. It has been. That is, the engaging portion 25 provided on the rotor core 20 is formed by alternately forming a plurality of protruding ridge portions 25a and concave grooves 25b extending in the axial direction in the circumferential direction. The ridges 25a of the rotor core 20 are opposed to the concave grooves 11b of the shaft 10 with a predetermined distance, and the concave grooves 25b of the rotor core 20 are separated from the ridges 11a of the shaft 10 with a predetermined distance. It is in an opposing state. Thereby, a predetermined gap is formed between the engaging portion 25 of the rotor core 20 and the engaging portion 11 of the shaft 10.

  In the cast conductor 30 of the second embodiment, a part of the molten aluminum at the time of casting is also introduced in the gap formed between the engaging portion 25 of the rotor core 20 and the engaging portion 11 of the shaft 10. It is the same as that of Embodiment 1 that it has the filling part 33 formed by being filled via 24 (refer FIG.4 and FIG.5).

  According to the rotor 2 of the second embodiment configured as described above, in the cast conductor 30, the gap formed between the rotor core 20 and the shaft 10 is filled with a part of the molten aluminum at the time of casting. It has the filling part 33 formed by this. Therefore, the same operation and effect as in the first embodiment can be achieved, such as reducing or reducing the shaft insertion load when the shaft 10 and the rotor core 20 are fitted and assembled.

  In particular, in the second embodiment, since both the shaft 10 and the rotor core 20 are provided with gear / spline type engaging portions 11 and 25, the shaft 10 and the rotor core are compared with the case of the first embodiment. The fixing force in the rotational direction of 20 can be further strengthened.

[Embodiment 3]
A rotor 3 of a rotating electrical machine according to Embodiment 3 will be described with reference to FIGS. Similar to the second embodiment, the rotor 3 of the third embodiment is different from the first embodiment in that the engaging portions 11 and 25 are provided on both the shaft 10 and the rotor core 20. Therefore, detailed description of members and configurations common to the first and second embodiments will be omitted, and different points and important points will be described below. In addition, the same code | symbol is used about the member which is common in Embodiment 1. FIG.

  The shaft 10 according to the third embodiment is formed in a solid cylindrical shape from an iron-based metal, and the central portion except for both end portions in the axial direction is formed with a constant diameter. And the uneven | corrugated shaped engaging part 11 formed by knurling is provided in the site | part where the rotor core 20 of the outer peripheral surface of the shaft 10 is fitted similarly to Embodiment 1. Yes. That is, similar to the first embodiment, the outer peripheral surface of the shaft 10 is provided with the engaging portions 11 in which a plurality of protruding ridge portions 11a and concave grooves 11b extending in the axial direction are alternately formed in the circumferential direction.

  On the other hand, on the inner peripheral surface of the rotor core 20 fitted on the outer peripheral surface of the shaft 10, a gear / spline type engaging portion 25 similar to that of the second embodiment is provided. That is, the inner peripheral surface of the rotor core 20 is provided with an engaging portion 25 in which a plurality of protruding ridge portions 25a and concave grooves 25b extending in the axial direction are alternately formed in the circumferential direction. Thereby, also in Embodiment 3, a predetermined gap is formed between the engaging portion 25 on the inner peripheral surface of the rotor core 20 and the engaging portion 11 on the outer peripheral surface of the shaft 10.

  In the casting conductor 30 of the third embodiment, a part of the molten metal at the time of casting is melted in the gap formed between the engaging portion 25 of the rotor core 20 and the engaging portion 11 of the shaft 10. It is the same as that of Embodiments 1 and 2 to have the filling portion 33 formed by filling via (see FIGS. 7 and 8).

  According to the rotor 3 of the third embodiment configured as described above, in the cast conductor 30, the gap formed between the rotor core 20 and the shaft 10 is filled with a part of the molten aluminum at the time of casting. It has the filling part 33 formed by this. Therefore, the same operations and effects as those of the first and second embodiments can be achieved, for example, the shaft insertion load when the shaft 10 and the rotor core 20 are fitted and assembled can be reduced or reduced to zero.

  Also, in the case of the third embodiment, since the engaging portions 11 and 25 are provided in both the shaft 10 and the rotor core 20, the shaft 10 and the rotor core 20 are compared with the case of the first embodiment. The fixing force in the rotational direction can be further strengthened.

[Embodiment 4]
A rotor 4 of a rotating electrical machine according to Embodiment 4 will be described with reference to FIGS. In the rotor 1 of the first embodiment, the engaging portion 11 is provided only on the shaft 10, whereas in the rotor 4 of the fourth embodiment, the engaging portion 25 is provided only on the rotor core 20. This is different from the first embodiment. Therefore, the detailed description about the member and structure which are common in Embodiment 1 is abbreviate | omitted, and a different point and an important point are demonstrated below. In addition, the same code | symbol is used about the member which is common in Embodiment 1. FIG.

  The shaft 10 of the fourth embodiment is formed in a solid cylindrical shape with an iron-based metal, and is the same as the first embodiment in that the central portion excluding both axial ends is formed with a constant diameter. This embodiment is different from the first embodiment in that the concave-convex engaging portion 11 is not provided at a portion where the rotor core 20 on the outer peripheral surface of the shaft 10 is fitted.

  On the other hand, on the inner peripheral surface of the rotor core 20 fitted on the outer peripheral surface of the shaft 10, a gear / spline type engaging portion 25 similar to that of the second and third embodiments is provided. That is, the inner peripheral surface of the rotor core 20 is provided with an engaging portion 25 in which a plurality of protruding ridge portions 25a and concave grooves 25b extending in the axial direction are alternately formed in the circumferential direction. Thereby, also in Embodiment 4, a predetermined gap is formed between the engaging portion 25 on the inner peripheral surface of the rotor core 20 and the outer peripheral surface of the shaft 10.

  The cast conductor 30 according to the fourth embodiment also has a portion of the molten aluminum at the time of casting in the gap formed between the engaging portion 25 of the rotor core 20 and the outer peripheral surface of the shaft 10. It is the same as that of Embodiments 1-3 that it has the filling part 33 formed by being filled via FIG.10 and FIG.11).

  According to the rotor 4 of the fourth embodiment configured as described above, in the cast conductor 30, the gap formed between the rotor core 20 and the shaft 10 is filled with a part of the molten aluminum at the time of casting. It has the filling part 33 formed by this. Therefore, there are the same operations and effects as in the first to third embodiments such that the shaft insertion load when the shaft 10 and the rotor core 20 are fitted and assembled can be reduced or reduced to zero.

[Other Embodiments]
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, in the above embodiment, pure aluminum is used as the material of the cast conductor 30, but pure copper or an alloy containing them as a main component may be used instead of pure aluminum. In order to secure better performance, it is preferable to employ pure aluminum or pure copper having a low electrical resistance.

  Further, in the above embodiment, the example in which the rotor of the rotating electrical machine according to the present invention is applied to the rotor of the vehicle motor has been described. However, the rotation of the rotating electrical machine mounted on the vehicle and used as an electric motor or a generator is described. The present invention can also be applied to a rotor of a rotating electrical machine that can selectively use the rotor or both.

  DESCRIPTION OF SYMBOLS 1-4 ... Rotor, 10 ... Shaft, 11 ... Engagement part, 11a ... Projection part, 11b ... Groove, 20 ... Rotor core, 21 ... Steel plate, 22 ... Fitting hole, 23 ... Slot, 24 ... Molten metal introduction passage, 25 ... engaging part, 25a ... convex strip part, 25b ... concave groove, 30 ... cast conductor, 31 ... end ring, 32 ... connecting bar, 33 ... filling part.

Claims (4)

A shaft (10);
A plurality of steel plates (21) laminated in the axial direction, a fitting hole (22) fitted to the outer peripheral surface of the shaft, and a plurality of slots (23) penetrating in the axial direction and arranged in the circumferential direction A rotor core (20) having:
A pair of end rings (31) arranged on both sides in the axial direction of the rotor core and a plurality of connecting bars (32) for connecting the pair of end rings via the slots are formed integrally by casting. A rotor of a rotating electrical machine comprising a cast conductor (30),
The rotor core is formed of a part of the steel plates of the plurality of steel plates, and has a molten metal introduction passage (24) extending radially inward from the slot and opening to an inner peripheral surface of the rotor core. Have
The casting conductor has a filling portion (33) formed by filling a gap formed between the rotor core and the shaft through a portion of the molten metal during casting through the molten metal introduction passage. A rotor for a rotating electrical machine, comprising:   The engagement portion (11, 25) for restricting relative displacement in the rotation direction of the shaft and the rotor core is provided on at least one of the shaft and the rotor core. The rotor of the described rotating electrical machine.   The said engaging part is comprised by the some protruding item | line part (11a, 25a) and the ditch | groove (11b, 25b) which are arrange | positioned alternately in the circumferential direction, and extends in the axial direction. The rotor of the described rotating electrical machine. The rotor of the rotating electrical machine according to any one of claims 1 to 3 , wherein a material of the cast conductor is aluminum, copper, or an alloy containing them as a main component.

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