JP2016103882A - Rotor and manufacturing method of rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor capable of keeping a bond strength of a rotor core while stabilizing a weld quality in an end of the rotor core.SOLUTION: In a rotor 20, a rotor core 21 includes: a core welding part 25 which is provided on an inner peripheral surface 21f of the rotor core 21 so as to extend in an axial direction and in which a plurality of electromagnetic steel sheets 22 are welded with each other in the axial direction; and a welding suppression part 26 which is provided from an end 25a (25b) of a core welding part 25 in the axial direction to a core end face 21c (21d) of the rotor core 21 in the axial direction and in which welding is suppressed more than the core welding part 25. A weld depth d3 of a hub member welding part 29 from the core end face 21c (21d) in the axial direction is equal to or more than a length L2 of the welding suppression part 26 from the core end face 21c (21d) in the axial direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotor and a method for manufacturing the rotor, and more particularly to a rotor including a core welded portion in which a plurality of electromagnetic steel sheets are welded along the axial direction and a method for manufacturing the rotor.

  Conventionally, a rotor including a core welded portion in which a plurality of electromagnetic steel plates are welded along an axial direction is known (see, for example, Patent Document 1).

  Patent Document 1 discloses a rotating electrical machine including a rotor and a stator. The rotor core of this rotor is composed of a plurality of electromagnetic steel plates. Further, a through hole for inserting the rotating shaft is provided in the central portion of the rotor core. And by welding the inner peripheral surface of the through-hole of a rotor core along an axial direction, a some electromagnetic steel plate is welded and a core welding part is formed. The core welded portion is welded at substantially the same welding depth from one end to the other end in the axial direction of the inner peripheral surface of the through hole of the rotor core.

  Here, in the rotor (rotor core) described in Patent Document 1, since the core welded portion is welded at substantially the same welding depth from one end in the axial direction to the other end, at the end portion in the axial direction of the through hole. Due to the fact that the heat of welding is difficult to escape to the outside, the temperature of the end of the rotor core rises rapidly during welding. For this reason, since spatter (spattering of molten metal) may occur at the end of the rotor core or the end may be damaged, there is a disadvantage that the welding quality at the end of the rotor core becomes unstable.

  Conventionally, in order to eliminate the above-described inconvenience, welding is performed so as to weaken the output of the welding heat source in the vicinity of the end of the rotor core. By weakening the output of the welding heat source in the vicinity of the end portion of the rotor core in this way, a rapid temperature rise at the end portion of the rotor core is suppressed, so that the occurrence of spatter at the end portion of the rotor core and the breakage of the end portion are suppressed. It becomes possible to stabilize the welding quality.

JP 2008-154436 A

  However, as described above, when the output of the welding heat source is weakened near the end of the rotor core, it becomes possible to stabilize the welding quality at the end of the rotor core, while welding near the end of the rotor core. Since the depth is small, there is a problem that the joint strength near the end of the rotor core is lowered.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to secure the joint strength of the rotor core while stabilizing the welding quality at the end of the rotor core. And a method of manufacturing the rotor.

  In order to achieve the above object, the rotor according to the first aspect of the present invention is formed by rotating around a rotation axis and laminating a plurality of electromagnetic steel plates in an axial direction that is a direction in which the rotation axis extends. A rotor core having a through-hole at the center of rotation, a rotation transmission member attached to the through-hole of the rotor core, an inner peripheral surface of the through-hole of the rotor core, and an outer peripheral surface of the rotation transmission member provided at an axial end of the rotor core And a core transmission member welded portion welded to each other, and the rotor core is provided so as to extend in the axial direction on the inner peripheral surface or outer peripheral surface of the rotor core, and a plurality of electromagnetic steel sheets are welded along the axial direction. A core welded portion, and a welding suppression portion that is provided from the axial end portion of the core welded portion to the axial end surface of the rotor core and in which welding is suppressed more than the core welded portion, Axial weld depth from the core end face of the reach members weld the axial direction from the core end face of the weld suppressing portion is greater than or equal length.

  In the rotor according to the first aspect of the present invention, as described above, the welding suppression portion that is provided from the axial end portion of the core welding portion to the core end surface of the rotor core in the axial direction and in which welding is suppressed more than the core welding portion. The rotor core is configured to include Thereby, since welding is suppressed in the welding suppression part provided in the axial direction edge part side of a rotor core, it is suppressed that the temperature of an edge part raises rapidly at the time of welding. As a result, it is possible to suppress the occurrence of spatter and breakage at the end of the rotor core during welding, so that the welding quality at the end of the rotor core can be stabilized. Moreover, it originates in having provided the welding suppression part by making the axial welding depth from the core end surface of a core transmission member welding part more than the axial direction length from the core end surface of a welding suppression part. The reduced joint strength of the rotor core can be compensated for by the core transmission member weld. Thereby, the fall of the joint strength of a rotor core can be suppressed. By these, in this invention, the joint strength of a rotor core is securable, aiming at stabilization of the welding quality in the edge part of a rotor core.

  The rotor manufacturing method according to the second aspect of the present invention is formed by laminating a plurality of electromagnetic steel plates in the axial direction, which is a direction in which the rotation axis extends, while being rotated around the rotation axis. A rotor manufacturing method comprising a rotor core having a hole and a rotation transmission member attached to a through-hole of the rotor core, wherein a plurality of laminated electromagnetic steel sheets are axially arranged on the inner peripheral surface or outer peripheral surface of the rotor core. Welding along which the core welded portion extending in the axial direction is formed, and welding is suppressed from the core welded portion over the core end surface in the axial direction of the rotor core from the axial end portion of the core welded portion. A step of forming the suppressing portion, a step of inserting the rotation transmitting member into the through hole of the rotor core, and an inner periphery of the rotor core at the axial end portion of the rotor core. And the outer peripheral surface of the rotation transmitting member inserted into the through hole are welded to each other at an axial welding depth from the core end surface that is equal to or longer than the axial length from the core end surface of the welding suppression portion. Forming a transmission member weld.

  In the method for manufacturing a rotor according to the second aspect of the present invention, as described above, welding suppression in which welding is suppressed from the core welded portion over the core end surface in the axial direction of the rotor core from the axial end portion of the core welded portion. Forming a portion. Thereby, since welding is suppressed in the welding suppression part provided in the axial direction edge part side of a rotor core, it is suppressed that the temperature of an edge part raises rapidly at the time of welding. As a result, it is possible to suppress the occurrence of spatter and breakage at the end of the rotor core during welding, so that the welding quality at the end of the rotor core can be stabilized. Further, at the axial end portion of the rotor core, the inner peripheral surface of the rotor core and the outer peripheral surface of the rotation transmitting member inserted into the through hole are longer than the axial end length from the core end surface of the welding suppression portion. And a step of forming a core transmission member welded portion by welding each other at a welding depth in the axial direction. As a result, the joint strength of the rotor core, which has been reduced due to the provision of the welding suppression portion, can be compensated by the core transmission member welding portion. Thereby, the fall of the joint strength of a rotor core can be suppressed. By these, in this invention, the manufacturing method of the rotor which can ensure the joint strength of a rotor core can be provided, achieving stabilization of the welding quality in the edge part of a rotor core.

  ADVANTAGE OF THE INVENTION According to this invention, the rotor and the manufacturing method of a rotor which can ensure the joint strength of a rotor core can be provided, aiming at stabilization of the welding quality in the edge part of a rotor core as mentioned above.

It is sectional drawing of the rotary electric machine by 1st Embodiment of this invention. It is the front view seen from the axial direction (Z1 direction side) of the rotor by 1st Embodiment of this invention. FIG. 3 is a partially enlarged view of FIG. 2. It is an expanded sectional view along the 200-200 line of FIG. It is sectional drawing for demonstrating the process of forming a core welding part and a welding suppression part in the internal peripheral surface of a rotor core. It is sectional drawing for demonstrating the process of inserting a hub member in the through-hole of a rotor core. It is sectional drawing for demonstrating the process of forming a hub member welding part. It is sectional drawing of the rotor of the rotary electric machine by 2nd Embodiment of this invention. It is sectional drawing of the rotor by the 1st modification of 1st and 2nd embodiment of this invention. It is sectional drawing of the rotary electric machine by the 2nd modification of 1st and 2nd embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
[Structure of rotating electrical machine (rotor)]
With reference to FIGS. 1-4, the structure of the rotary electric machine 100 by 1st Embodiment is demonstrated first.

  As shown in FIGS. 1 and 2, the rotating electrical machine 100 includes a stator 10 and a rotor 20.

  The stator 10 includes a stator core 11 and a winding 12 wound around the stator core 11.

  The rotor 20 includes a rotor core 21. The rotor core 21 is formed by laminating a plurality of electromagnetic steel plates 22 in the axial direction (Z direction), which is the direction in which the rotation axis extends, while rotating around the rotation axis. Further, the rotor core 21 is provided with a through hole 21a at the center of rotation. A hub member 23 is attached to the through hole 21 a of the rotor core 21. The hub member 23 is an example of the “rotation transmission member” in the present invention. A rotating shaft 24 is attached to the hub member 23. Further, the stator core 11 and the rotor core 21 are arranged so as to face each other.

  As shown in FIGS. 1 to 4, the rotor core 21 is provided with an insertion hole 21 b into which the permanent magnet 30 is inserted. A plurality of insertion holes 21b are provided along the circumferential direction. The insertion hole 21b is formed so as to extend from the core end surface 21c on the Z1 direction side of the rotor core 21 to the core end surface 21d on the Z2 direction side.

  The inner circumferential surface 21f of the rotor core 21 is provided with a U-shaped groove 21e that is recessed outward in the radial direction of the rotor core 21 when viewed from the axial direction. The groove 21e is formed so as to extend from the core end surface 21c on the Z1 direction side of the rotor core 21 to the core end surface 21d on the Z2 direction side along the axial direction. In addition, eight groove portions 21e are provided at equal angular intervals of 45 degrees in the circumferential direction.

  As shown in FIGS. 3 and 4, a core welded portion 25 is provided on the inner peripheral surface 21 f of the rotor core 21. The core welded portion 25 is provided so as to extend in the axial direction at the bottom of the U-shaped groove 21e of the inner peripheral surface 21f of the rotor core 21. Moreover, the core welding part 25 is formed by welding several electromagnetic steel plates 22 along an axial direction (lamination direction).

  As shown in FIG. 4, the core welded portion 25 has a welding depth d <b> 1 in the radial direction (X direction) of the rotor core 21. In addition, the welding depth d1 of the core welding part 25 is substantially constant and does not change along an axial direction. Further, the core welded portion 25 has an axial length L1.

  In the first embodiment, as shown in FIGS. 2 and 3, the core welded portion 25 is provided at a plurality of locations that are spaced apart from each other at predetermined angular intervals in the circumferential direction on the inner peripheral surface 21 f of the rotor core 21. . Specifically, the core welding part 25 is provided in each of the groove parts 21e provided at eight places at equal angular intervals of 45 degrees in the circumferential direction.

  Further, as shown in FIG. 4, the rotor core 21 is provided with a welding suppression portion 26. The welding suppression portion 26 is provided from the axial end portion 25 a (25 b) of the core welding portion 25 to the axial core end surface 21 c (21 d) of the rotor core 21. That is, the welding suppression part 26 is formed in the edge part of both the axial directions (Z1 direction and Z2 direction) of the rotor core 21. As shown in FIG. The welding suppression portion 26 is formed by suppressing welding more than the core welding portion 25. In addition, suppression of welding is performed by suppressing the amount of welding. That is, in the cross section cut along the plane orthogonal to the axial direction, the welding suppression portion 26 suppresses welding by making the welding cross-sectional area of the welding suppression portion 26 smaller than the welding cross-sectional area of the core welding portion 25. ing. Moreover, the welding suppression part 26 is provided in each of the groove part 21e (refer FIG. 2) provided in eight places at equal angular intervals of 45 degrees with respect to the circumferential direction.

  Specifically, the welding suppression portion 26 includes a welding slope portion 27 and a core unwelded portion 28 that is not welded. The welding slope portion 27 is formed by gradually decreasing the welding depth d2 in the radial direction from the axial end portion 25a (25b) of the core welding portion 25 toward the core end surface 21c (21d). That is, the welding depth d2 of the welding slope portion 27 gradually decreases from the welding depth equal to the welding depth d1 of the core welding portion 25 and finally becomes 0 (0 ≦ d2 ≦ d1).

  Moreover, the core unwelded part 28 which is not welded is provided from the outer end part 271 (272) in the axial direction of the welding slope part 27 to the core end surface 21c (21d).

  As shown in FIG. 4, hub member welded portions 29 are provided at both end portions 21 g and 21 h in the axial direction (Z1 direction and Z2 direction) of the rotor core 21. The hub member welded portion 29 is an example of the “core transmission member welded portion” in the present invention. The hub member welded portion 29 is formed by welding the inner peripheral surface 21 f of the through hole 21 a of the rotor core 21 and the outer peripheral surface 23 a of the hub member 23 to each other. The hub member welded portion 29 has a welding depth d3 in the axial direction from the core end surface 21c (21d).

  In the first embodiment, as shown in FIG. 2, the hub member welded portion 29 is formed along the inner peripheral surface 21 f of the through hole 21 a of the rotor core 21 at the axial end portion 21 g (21 h) of the rotor core 21. It is provided in a circumferential shape. That is, the hub member welded portion 29 welds substantially the entire circumference of the inner peripheral surface 21f of the through hole 21a and the substantially entire circumference of the outer peripheral surface 23a of the hub member 23 when viewed from the axial direction. In addition, the part in which the groove part 21e is provided among the internal peripheral surfaces 21f of the through-hole 21a is not welded with the hub member 23, as shown in FIG.

  Here, in the first embodiment, as shown in FIG. 4, the axial welding depth d3 from the core end surface 21c (21d) of the hub member welded portion 29 is the core end surface 21c (21d) of the welding suppressing portion 26. Larger than the axial length L2 from (d3> L2). That is, the welding depth d3 is larger than the total length L2 of the axial length L3 of the welding slope portion 27 and the axial length L4 of the core unwelded portion 28 (d3> L2 = L3 + L4).

  In the first embodiment, the welding depth d3 in the axial direction from the core end surface 21c (21d) of the hub member welding portion 29 is greater than the welding depth d1 in the radial direction (X direction) of the rotor core of the core welding portion 25. Is also large (d3> d1).

[Welding cross section of core weld]
Next, a method of setting the welding cross-sectional area S (cross-sectional area when the core welded portion 25 is cut in the radial direction) per location of the core welded portion 25 will be described. The welding cross-sectional area S of the core welded portion 25 is such that the shear stress applied to the core welded portion 25 (= the shear load applied to the core welded portion 25 / the entire joint area of the core welded portion 25) It is set to be smaller. Here, the entire joining area of the core welded portion 25 is obtained by multiplying the weld cross-sectional area S by the total number of joining locations (for both sides in the axial direction of the rotor core 21). The yield stress means the stress when changing from elastic deformation to plastic deformation when the electromagnetic steel sheet 22 is deformed by applying a load.

[Minimum welding depth of hub member welds]
Next, the minimum value of the welding depth d3 of the hub member welded portion 29 will be described. The welding depth d3 of the hub member welded portion 29 is such that the shear stress applied to the hub member welded portion 29 (= the shear load applied to the hub member welded portion 29 / the entire joint area of the hub member welded portion 29) The size is set to be smaller than the yield stress. In this case, the entire joining area of the hub member welded portion 29 is obtained by multiplying the welding depth d3 by the length of the joining portion (for both sides in the axial direction of the rotor core 21). That is, since the shear stress applied to the hub member welded portion 29 is inversely proportional to the weld depth d3, the weld depth d3 is set to make the shear stress applied to the hub member welded portion 29 smaller than the yield stress of the electromagnetic steel sheet 22. It is necessary to make it larger than a predetermined value (minimum value). In other words, in the first embodiment, the welding depth d3 of the hub member welded portion 29 is greater than the axial length L2 from the core end surface 21c (21d) of the weld suppressing portion 26, and the hub member welded portion 29. Is set to such a magnitude that the shear stress applied to is smaller than the yield stress of the electromagnetic steel sheet 22.

[Method of manufacturing rotor]
Next, with reference to FIGS. 5-7, the manufacturing method of the rotor 20 by 1st Embodiment is demonstrated.

  First, as shown in FIGS. 5 and 6, the core unwelded portion 28 and the core welded portion 25 are formed on the inner peripheral surface 21 f of the rotor core 21 formed by laminating a plurality of electromagnetic steel plates 22 in the axial direction. To do. As a welding method in this case, for example, high energy beam welding (laser, electron beam, etc.) or TIG welding (Tungsten Inert GasArc Welding) is desirable. Specifically, first, in order to provide the core unwelded portion 28 on the Z1 direction side, welding is performed in the axial direction of the rotor core 21 by the length L4 in the axial direction of the core unwelded portion 28 from the core end surface 21c on the Z1 direction side. It starts from a position shifted to the center of. Thereby, the core unwelded part 28 (refer FIG. 6) of the Z1 direction side is provided.

  After providing the core unwelded portion 28 on the Z1 direction side, the welding depth is gradually increased by welding toward the center in the axial direction while gradually increasing the output of the welding heat source. A welding slope portion 27 on the side is formed. The weld slope portion 27 on the Z1 direction side is formed to have an axial length L3. Then, the core welding part 25 is formed by welding toward the Z2 direction side in the state which made the output of the welding heat source constant. Core weld 25 is formed to have an axial length L1. Further, welding is performed toward the core end surface 21d on the Z2 direction side while gradually reducing the output of the welding heat source, whereby the welding slope portion 27 on the Z2 direction side is formed. The weld slope portion 27 on the Z2 direction side is formed to have an axial length L3. Thereafter, welding is terminated at a position of length L4 from the core end surface 21d on the Z2 direction side toward the Z1 direction side. Thereby, the core unwelded portion 28 on the Z2 direction side is provided. As a result, the welding suppressing portion 26 is formed from both the end portions 25a and 25b (see FIG. 4) in both the axial directions (Z1 direction and Z2 direction) of the core welded portion 25 to the core end surfaces 21c and 21d in the axial direction of the rotor core 21. Is done.

  Next, as shown in FIG. 6, the hub member 23 is inserted into the through hole 21 a of the rotor core 21.

  Thereafter, as shown in FIG. 7, at both end portions 21g and 21h in the axial direction (Z1 direction and Z2 direction) of the rotor core 21, the hub member inserted into the inner peripheral surface 21f of the rotor core 21 and the through hole 21a. The outer peripheral surface 23a of 23 is welded by a high energy beam (laser, electron beam, etc.) or the like. Thereby, the hub member welding part 29 is formed. The inner peripheral surface 21f of the rotor core 21 and the outer peripheral surface 23a of the hub member 23 have an axial welding depth d3 from the core end surface 21c (21d) of the hub member welded portion 29, and the core of the weld suppressing portion 26. It is set to a size that is larger than the axial length L2 (see FIG. 4) from the end face 21c (21d) and that the shear stress applied to the hub member welded portion 29 is smaller than the yield stress of the electromagnetic steel sheet 22. And welded together. Further, this welding is performed while rotating the rotor core 21 and the hub member 23 about the axis, and substantially the entire circumference of the inner peripheral surface 21f of the rotor core 21 and the outer peripheral surface 23a of the hub member 23 is welded. Thereby, the rotor 20 is completed.

[Effect of the first embodiment]
In the first embodiment, the following effects can be obtained.

  In the first embodiment, as described above, the core welded portion 25 is provided from the axial end portion 25a (25b) to the axial core end surface 21c (21d) of the rotor core 21, and is welded more than the core welded portion 25. The rotor core 21 is configured to include the suppressed welding suppression portion 26. Thereby, since welding is suppressed in the welding suppression part 26 provided in the edge part 21g (21h) side of the axial direction of the rotor core 21, it is suppressed that the temperature of the edge part 21g (21h) rises rapidly at the time of welding. The As a result, it is possible to suppress the occurrence of spatter and breakage at the end 21g (21h) of the rotor core 21 during welding, so that the welding quality at the end 21g (21h) of the rotor core 21 can be stabilized. Further, the axial welding depth d3 from the core end surface 21c (21d) of the hub member welded portion 29 is made larger than the axial length L2 from the core end surface 21c (21d) of the welding suppressing portion 26. The hub member welded portion 29 can compensate for the reduced joint strength of the rotor core 21 due to the provision of the welding suppression portion 26. Thereby, the fall of the joint strength of the rotor core 21 can be suppressed. Accordingly, in the first embodiment, it is possible to ensure the bonding strength of the rotor core 21 while stabilizing the welding quality at the end 21g (21h) of the rotor core 21.

  Moreover, in 1st Embodiment, as mentioned above, the welding suppression part 26 makes the welding cross-sectional area of the welding suppression part 26 larger than the welding cross-sectional area of the core welding part 25 in the cross section cut | disconnected by the surface orthogonal to an axial direction. The welding is suppressed by reducing the size. Thereby, since the influence of the welding to the rotor core 21 in the welding suppression part 26 with a small welding cross-sectional area compared with the core welding part 25 can be made small, generation | occurrence | production of the spatter | spatter at the time of welding, etc. can be suppressed.

  Moreover, in 1st Embodiment, as mentioned above, the hub member welding part 29 and the welding suppression part 26 are provided in the edge part 21g (21h) of both the axial directions (Z1 direction and Z2 direction) of the rotor core 21, At both end portions 21g (21h) in the axial direction of the rotor core 21, the axial welding depth d3 from the core end surface 21c (21d) of the hub member welded portion 29 is set as the core end surface 21c (21d) of the welding suppressing portion 26. It is made larger than the length L2 of the axial direction from. As a result, the joint strength of the rotor core 21 can be ensured while stabilizing the welding quality of the rotor core 21 at both end portions 21g (21h) in the axial direction of the rotor core 21, so that the end portion 21g of the rotor core 21 is secured. Stabilization of the welding quality in (21h) and securing of the joint strength of the rotor core 21 can be achieved more sufficiently.

  Further, in the first embodiment, as described above, the core welded portion 25 is axially arranged at a plurality of locations (eight locations) spaced at equal angular intervals of 45 degrees in the circumferential direction on the inner peripheral surface 21f of the rotor core 21. Provide to extend. Thereby, compared with the case where the single core welding part 25 is provided, the joining strength of the rotor core 21 can be raised more. In addition, by providing the core welded portions 25 at equiangular intervals in the circumferential direction on the inner peripheral surface 21f of the rotor core 21, the core welded portions 25 are arranged in a balanced manner along the circumferential direction. Can rotate well.

  In the first embodiment, as described above, the hub member welded portion 29 is formed in a circumferential shape along the inner peripheral surface 21f of the through hole 21a of the rotor core 21 at the axial end portion 21g (21h) of the rotor core 21. Provided. Thereby, unlike the case where the hub member welded portion 29 is locally provided on the inner peripheral surface 21f of the through hole 21a of the rotor core 21, the bonding strength between the rotor core 21 and the hub member 23 can be increased.

  In the first embodiment, as described above, the welding slope portion in which the welding depth d2 is gradually reduced from the axial end portion 25a (25b) of the core welding portion 25 toward the core end surface 21c (21d). 27 and the unwelded core unwelded portion 28 that is provided from the end portion 271 (272) in the axial direction of the weld slope portion 27 to the core end surface 21c (21d). As a result, the welding slope portion 27 weakens the irradiation of the laser beam for welding, and the core unwelded portion 28 stops the irradiation of the laser beam for welding, so that the axial end portion 21g ( In 21h), the temperature rise due to welding can be suppressed. As a result, it is possible to suppress the occurrence of spatter at the end 21g (21h) of the rotor core 21 and the damage to the end 21g (21h) during welding. Further, since the irradiation of the laser for welding is stopped at the core unwelded portion 28, it is possible to suppress the irradiation of the laser or the like to the outside of the rotor core 21. Further, by providing the core unwelded portion 28 on the core end surface 21c (21d) side, the core end surface of the core unwelded portion 28 is suppressed while suppressing the welding laser or the like from being irradiated to the outside of the rotor core 21. By providing the welding slope portion 27 on the side opposite to 21c (21d), the joining strength of the rotor core 21 can be increased as compared with the case where the welding suppression portion 26 is configured only by the core unwelded portion 28.

  In the first embodiment, as described above, the welding depth d3 in the axial direction from the core end surface 21c (21d) of the hub member welding portion 29 is set as the welding depth in the radial direction of the rotor core 21 in the core welding portion 25. It is made larger than d1. Thereby, since the welding depth d3 of the hub member welded portion 29 is large, the joint strength of the rotor core 21 that is lowered due to the welding being suppressed in the welding suppressing portion 26 can be sufficiently compensated.

  In the first embodiment, the hub member 23 is attached to the through hole 21a of the rotor core 21 as described above. Thereby, since the outer peripheral surface 23a of the hub member 23 and the inner peripheral surface 21f of the through hole 21a of the rotor core 21 are directly welded, the rotation of the rotor core 21 can be reliably transmitted to the hub member 23.

(Second Embodiment)
[Rotary electrical machine rotor structure]
Next, the structure of the rotor 40 of the rotating electrical machine 100a according to the second embodiment will be described with reference to FIG. In the second embodiment, unlike the first embodiment in which the core unwelded portion 28 is provided in the weld suppression portion 26 (see FIG. 4), the core suppression portion 43 is not provided in the weld suppression portion 43.

  As shown in FIG. 8, a core weld portion 42 is provided in the groove portion 41 b of the inner peripheral surface 41 a of the rotor core 41. The core welded portion 42 is provided on the inner peripheral surface 41 a of the rotor core 41 so as to extend in the axial direction. The core welded portion 42 has a welding depth d4 in the radial direction (X direction) of the rotor core 41.

  Further, the inner circumferential surface 41a of the rotor core 41 is provided with a welding suppression portion 43 on the Z1 direction side from the end portion 42a in the axial direction (Z1 direction) of the core welding portion 42 to the core end surface 41c in the axial direction of the rotor core 41. ing. The welding suppression part 43 on the Z1 direction side is composed only of a welding slope part, and is formed by gradually reducing the welding depth d5 from the axial end part 42a of the core welding part 42 to the core end face 41c. ing. That is, the welding depth d5 gradually decreases from a welding depth equal to the radial welding depth d4 of the rotor core 41 of the core welded portion 42, and finally becomes 0 (0 ≦ d5 ≦ d4). Moreover, the welding suppression part 43 has length L5 to the axial direction from the core end surface 41c. Further, the inner circumferential surface 41a of the rotor core 41 is provided with a Z2 direction-side welding suppressing portion 43 extending from the axial end portion 42b of the core welded portion 42 to the core end surface 41d of the rotor core 41 in the axial direction. ing. In both end portions 41e and 41f in the axial direction (Z1 direction and Z2 direction) of the rotor core 41, the welding depth d6 in the axial direction from the core end surface 41c (41d) of the hub member welded portion 44 is the welding suppression portion. 43 is larger than the axial length L5 from the core end surface 41c (41d) (d6> L5). The hub member welded portion 44 is an example of the “core transmission member welded portion” in the present invention.

  In addition, the other structure of 2nd Embodiment is the same as that of the said 1st Embodiment.

[Effect of the second embodiment]
In the second embodiment, as described above, the weld suppressing portion 43 is not provided with the core unwelded portion, and the welding suppressing portion 43 is configured by the weld slope portion, so that the plurality of electromagnetic steel plates 22 have one end in the axial direction. From the welding to the other end, the joint strength of the rotor core 41 can be further increased.

  The remaining effects of the second embodiment are similar to those of the aforementioned first embodiment.

[Modification]
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiment but by the scope of claims for patent, and further includes all modifications (modifications) within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the first and second embodiments described above, the axial welding depth from the core end surface of the hub member welded portion is the axial length from the core end surface of the welding suppression portion at the axial end portion of the rotor core. However, the present invention is not limited to this. In the present invention, if the welding depth in the axial direction from the core end surface of the hub member welded portion is equal to or greater than the axial length from the core end surface of the welding suppression portion (including the case where the welding depth and length are the same). Good.

  Moreover, in the said 1st Embodiment, although the welding suppression part was comprised by the core unwelded part and the welding slope part, and the 2nd Embodiment showed the example which comprises a welding suppression part only by a welding slope part, this invention Is not limited to this. For example, you may comprise a welding suppression part only by a core unwelded part, without providing a welding slope part. In this case, the axial welding depth from the core end surface of the hub member welded portion is set to be equal to or greater than the axial length from the core end surface of the core unwelded portion.

  Moreover, in the said 1st Embodiment, the welding suppression part comprised by the core unwelded part and the welding slope part is provided in both the edge parts of the axial direction of a rotor core, and in 2nd Embodiment, it comprises only a welding slope part. Although the example in which the made welding suppression part was provided in the both ends of the axial direction of a rotor core was shown, this invention is not limited to this. For example, the welding suppression portion at one end in the axial direction of the rotor core may be configured by the core unwelded portion and the welding slope portion, and the welding suppression portion at the other end may be configured only by the welding slope portion.

  Moreover, in the said 1st and 2nd embodiment, although the welding suppression part showed the example provided in both the edge parts of the axial direction of a rotor core, this invention is not limited to this. For example, you may provide a welding suppression part only in one edge part of the axial direction of a rotor core.

  In the first and second embodiments, the example in which the core welded portion is provided at eight positions at an equal angular interval of 45 degrees in the circumferential direction on the inner peripheral surface of the rotor core is shown. Not limited to. For example, the core welds may be provided on the inner peripheral surface of the rotor core at a number other than eight locations at equal angular intervals or intervals other than equal angular intervals.

  In the first and second embodiments, the hub member welded portion is provided at substantially the entire circumference of the inner peripheral surface of the through-hole of the rotor core at the axial end of the rotor core. The present invention is not limited to this. For example, as long as the desired joint strength of the rotor core can be maintained, the hub member welded portion may be locally provided on the inner peripheral surface of the through hole.

  Moreover, in the said 1st and 2nd embodiment, although the core welding part showed the example provided in the internal peripheral surface of the rotor core, this invention is not limited to this. For example, as shown in the rotor 50 of the first modification shown in FIG. 9, the core welded portion 52 and the weld suppressing portion 53 may be provided on the outer peripheral surface 51 a of the rotor core 51. In this case as well, the welding depth of the hub member welding portion (not shown) is set to be equal to or greater than the length of the welding suppression portion 53 in the axial direction (Z direction).

  In the first and second embodiments, the hub member is attached to the through hole of the rotor core. However, the present invention is not limited to this. For example, as shown in the rotor 60 of the second modification shown in FIG. 10, the rotating shaft 62 may be attached to the through hole 61 a of the rotor core 61. In this case, the core welded portion 63 and the welding suppression portion 64 are provided on the inner peripheral surface 61b of the rotor core 61, and the inner peripheral surface 61b of the rotor core 61 and the outer peripheral surface 62a of the rotary shaft 62 are welded to each other, thereby rotating shaft welding. Part 65 is formed. The rotating shaft 62 is an example of the “rotation transmitting member” in the present invention. The rotating shaft welded portion 65 is an example of the “core transmission member welded portion” in the present invention.

  Here, in the second modification shown in FIG. 10, the welding depth d7 in the axial direction from the core end surface 61c (61d) of the rotary shaft welding portion 65 is the same as that from the core end surface 61c (61d) of the welding suppression portion 64. It has a size not less than the length L6 in the axial direction (Z direction) (d7 ≧ L6).

  Moreover, in the said 1st and 2nd embodiment, although the example using high energy beam welding and TIG welding was shown as a welding method of a hub member welding part and a core welding part, this invention is not limited to this. In the present invention, a welding method other than high energy beam welding or TIG welding may be used.

  Moreover, in the said 1st and 2nd embodiment, although the example which forms a welding slope part by reducing the output (beam output) of a welding heat source was shown, this invention is not limited to this. For example, the welding slope portion may be formed by shifting the focus of the welding beam.

11 Stator core 20, 40, 50, 60 Rotor 21, 41, 51, 61 Rotor core 21a, 61a Through hole 21c, 21d, 41c, 41d, 61c, 61d Core end surface 21f, 41a, 61b Inner peripheral surface 21g, 21h, 41e, 41f End 22 Electrical steel plate 23 Hub member (rotation transmission member)
23a Outer peripheral surface 25, 42, 52, 63 Core welded portion 25a, 25b, 42a, 42b End portion 26, 43, 53, 64 Weld suppressing portion 27 Weld slope portion 28 Core unwelded portion 29, 44 Hub member welded portion (core Transmission member weld)
51a Outer peripheral surface 62 Rotating shaft (Rotation transmission member)
62a Outer peripheral surface 65 Rotary shaft weld (core transmission member weld)
271, 272 End d 1, d 4 (Core welded portion) Weld depth d 3, d 6 (Hub member welded portion) Weld depth d 7 (Rotary shaft welded portion) Weld depth L 2, L 5, L 6 (Weld suppression portion Length)

Claims (10)

A rotor core that is rotated around a rotation axis and is formed by laminating a plurality of electromagnetic steel plates in an axial direction that is a direction in which the rotation axis extends, and having a through hole at the rotation center;
A rotation transmitting member attached to the through hole of the rotor core;
A core transmission member welding portion provided at an end portion in the axial direction of the rotor core, wherein an inner circumferential surface of the through hole of the rotor core and an outer circumferential surface of the rotation transmission member are welded to each other;
The rotor core is provided on the inner peripheral surface or outer peripheral surface of the rotor core so as to extend in the axial direction, and a core welded portion in which the plurality of electromagnetic steel plates are welded along the axial direction, and an axis of the core welded portion A welding suppression portion provided from the end portion in the direction to the core end surface in the axial direction of the rotor core, wherein welding is suppressed from the core welding portion,
The welding depth in the axial direction from the core end surface of the core transmission member welding portion is a rotor that is equal to or longer than the axial length from the core end surface of the welding suppression portion.   The welding suppression portion is configured to suppress welding by making a welding cross-sectional area of the welding suppression portion smaller than a welding cross-sectional area of the core welding portion in a cross section cut by a plane orthogonal to the axial direction. The rotor according to claim 1, wherein   The welding suppression portion is a welding slope portion in which a welding depth is gradually reduced from an axial end portion of the core welding portion toward the core end surface, or from an axial end portion side of the core welding portion. The rotor according to claim 1, comprising at least one of unwelded core unwelded portions provided over the core end surface. The welding suppression portion includes the welding slope portion in which the welding depth is gradually reduced from the axial end portion of the core welding portion toward the core end surface, and the axial end portion of the welding slope portion. An unwelded core unwelded portion provided over the core end face,
In the axial end portion of the rotor core, the welding depth in the axial direction from the core end surface of the core transmission member welded portion includes the weld slope portion and the core unwelded portion, and the core of the welding suppression portion. The rotor according to claim 3, wherein the rotor is at least an axial length from the end face. The core transmission member welded portion and the weld suppression portion are provided at both ends in the axial direction of the rotor core,
At both ends in the axial direction of the rotor core, the welding depth in the axial direction from the core end surface of the core transmission member welded portion is greater than or equal to the axial length from the core end surface of the welding suppression portion. The rotor according to any one of claims 1 to 4.   The said core welding part is provided so that it may extend in an axial direction in the several location which spaced apart the predetermined angular space | interval in the circumferential direction in the said inner peripheral surface or the said outer peripheral surface of the said rotor core. The rotor according to claim 1.   The said core transmission member welding part is provided in any one of the Claims 1-6 provided in the circumferential form along the internal peripheral surface of the said through-hole of the said rotor core in the edge part of the axial direction of the said rotor core. The described rotor.   The welding depth in the axial direction from the core end surface of the core transmission member welding portion is greater than the welding depth in the radial direction of the rotor core of the core welding portion, according to any one of claims 1 to 7. Rotor.   The rotor according to claim 1, wherein the rotation transmission member includes one of a rotation shaft and a hub member to which the rotation shaft is attached. A rotor core that is rotated around a rotation axis and is formed by laminating a plurality of electromagnetic steel plates in an axial direction that is a direction in which the rotation axis extends, and having a through hole at the rotation center;
A rotor manufacturing method comprising a rotation transmitting member attached to the through hole of the rotor core,
On the inner peripheral surface or outer peripheral surface of the rotor core, by welding the laminated electromagnetic steel sheets along the axial direction, a core welded portion extending in the axial direction is formed, and the axial direction of the core welded portion Forming a welding suppression portion in which welding is suppressed from the core welding portion over the core end surface in the axial direction of the rotor core from the end portion of the rotor core;
Thereafter, inserting the rotation transmitting member into the through hole of the rotor core;
The axial length of the inner peripheral surface of the rotor core and the outer peripheral surface of the rotation transmitting member inserted into the through hole from the core end surface of the welding suppression portion at the axial end portion of the rotor core. Forming a core transmission member welded portion by welding each other at a welding depth in the axial direction from the core end surface.

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