JP2018148746A - Rotor and manufacturing method for rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor that is able to effectively cool a magnet inserted in a magnet insertion hole.SOLUTION: A rotor 20 comprises: a rotor core 21 in which a plurality of electromagnetic steel sheets 22 are layered, the rotor core having a magnet insertion hole 24 and a cooling fluid passage 26 (27) in which a cooling fluid F flows; and a permanent magnet 32 inserted in a magnet insertion hole 24 of the rotor core 21. The rotor core 21 has, between adjacent electromagnetic steel sheets 22 in a layering direction, an empty space D in which the cooling fluid F can be caused to flow toward the permanent magnet 32 inserted in the magnet insertion hole 24 from the cooling fluid passage 26 (27).SELECTED DRAWING: Figure 4

Description

  The present invention relates to a rotor and a method for manufacturing the rotor.

  Conventionally, a rotor cooled by a cooling fluid is known (see, for example, Patent Document 1).

  Patent Document 1 discloses a rotor cooled by lubricating oil as a cooling fluid. In this rotor, the lubricating oil flows along an axial direction of the rotor along an oil passage formed of a concave groove penetrating in the axial direction on the inner diameter surface of the rotor, and also flows along one end surface of the rotor in the axial direction. Thus, in this rotor, the inner diameter surface of the rotor and the one end surface in the axial direction are cooled by the lubricating oil. Further, in this rotor, a magnet insertion hole is formed in the vicinity of the outer peripheral surface (outer diameter surface), and it is considered that a magnet is inserted into the magnet insertion hole. It is considered that the magnet inserted into the magnet insertion hole is indirectly cooled by cooling the inner diameter surface of the rotor and one end surface in the axial direction with the lubricating oil.

JP 2014-33602 A

  However, by cooling the inner diameter surface of the rotor and one end surface in the axial direction with lubricating oil to cool the magnet inserted into the magnet insertion hole of the rotor indirectly, the magnet inserted into the magnet insertion hole of the rotor There is a problem that it cannot be cooled effectively. Also, since the magnet insertion hole (magnet) is arranged near the outer peripheral surface (outer diameter surface) opposite to the inner diameter surface where the rotor is cooled, it is inserted into the magnet insertion hole by cooling the rotor inner surface. It is difficult for the magnet to be cooled. Even in this respect, the magnet inserted into the magnet insertion hole cannot be cooled effectively.

  The present invention has been made to solve the above-described problems, and one object of the present invention is a rotor and a rotor capable of effectively cooling a magnet inserted into a magnet insertion hole. It is to provide a manufacturing method.

  To achieve the above object, a rotor according to a first aspect of the present invention has a magnet insertion hole, a cooling fluid passage through which a cooling fluid flows, and a rotor core in which a plurality of electromagnetic steel plates are laminated, and the rotor core And the rotor core causes the cooling fluid to flow from the cooling fluid passage toward the magnet inserted into the magnet insertion hole between the electromagnetic steel plates adjacent in the stacking direction. It has a possible gap.

  In the rotor according to the first aspect of the present invention, as described above, the rotor core has a cooling fluid from the cooling fluid passage toward the magnet inserted into the magnet insertion hole between the electromagnetic steel plates adjacent in the stacking direction. It has a gap that can flow. Thereby, the cooling fluid can be directly applied to the side surface along the rotation axis direction of the magnet, and the side surface along the rotation axis direction of the magnet can be directly cooled by the cooling fluid. As a result, the magnet inserted into the magnet insertion hole of the rotor core can be effectively cooled compared to the case where the magnet is indirectly cooled. This effect is particularly effective when the magnet insertion hole (magnet) is disposed on the side opposite to the side where the rotor core is cooled by the cooling fluid flowing through the cooling fluid passage. Moreover, since the rotor core can be cooled from the inside by flowing a cooling fluid through the gap between the adjacent electromagnetic steel sheets, not only the magnet inserted into the magnet insertion hole but also the rotor core can be effectively cooled. Can do.

  According to a second aspect of the present invention, there is provided a method for manufacturing a rotor, comprising: laminating a plurality of electromagnetic steel plates to form a rotor core having a magnet insertion hole and a cooling fluid passage through which a cooling fluid flows; Between the step of inserting the magnet into the insertion hole and the electromagnetic steel plate adjacent to the rotor core, there is a gap that allows the cooling fluid to flow from the cooling fluid passage toward the magnet inserted into the magnet insertion hole. And a step of completing the rotor.

  In the rotor manufacturing method according to the second aspect of the present invention, as described above, the cooling fluid is allowed to flow from the cooling fluid passage toward the magnet inserted into the magnet insertion hole between the electromagnetic steel plates adjacent to the rotor core. A step of completing the rotor in a state having a possible gap. Thereby, in the manufactured rotor, the cooling fluid is directly applied to the side surface along the rotation axis direction of the magnet, and the side surface along the rotation axis direction of the magnet is directly cooled by the cooling fluid. it can. As a result, it is possible to provide a method for manufacturing a rotor that can effectively cool the magnet inserted into the magnet insertion hole of the rotor core as compared with the case where the magnet is indirectly cooled. This effect is particularly effective when manufacturing a rotor in which the magnet insertion hole (magnet) is arranged on the side opposite to the side where the rotor core is cooled by the cooling fluid flowing in the cooling fluid passage. Moreover, since the rotor core can be cooled from the inside by flowing a cooling fluid through the gap between the adjacent electromagnetic steel sheets, not only the magnet inserted into the magnet insertion hole but also the rotor core can be effectively cooled. It is possible to provide a rotor manufacturing method capable of

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of a rotor and a rotor which can cool effectively the magnet inserted in the magnet insertion hole as mentioned above can be provided.

It is sectional drawing of the rotary electric machine by one Embodiment of this invention. It is the figure which looked at the rotor by one Embodiment of this invention from the rotating shaft direction (Z direction). FIG. 3 is a cross-sectional view taken along line 200-200 in FIG. 2. It is sectional drawing along the 300a-300a line | wire (300b-300b line | wire) of FIG. It is a perspective view which shows the welding part and cooling fluid channel | path of a rotor of one Embodiment of this invention. It is a perspective view which shows the fluid passage for cooling of the rotor of one Embodiment of this invention. It is a flowchart for demonstrating the manufacturing method of the rotor of one Embodiment of this invention. It is a figure for demonstrating the deformation | transformation of the rotor core by welding, Comprising: (A) is a schematic diagram which shows a deformation | transformation of the rotor core welded in the state by which a magnet is not inserted, (B) is the state in which the magnet was inserted It is a schematic diagram which shows the deformation | transformation of the rotor core welded by. It is sectional drawing of the rotor by the modification of one Embodiment of this invention.

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

(Structure of rotating electrical machine)
With reference to FIGS. 1-5, the structure of the rotary electric machine 100 (rotor 20) by one Embodiment is demonstrated.

  In the present specification, the “rotation axis direction” means a direction (Z direction, see FIG. 1) along the rotation axis C of the rotor 20 (rotor core 21) in a state completed as the rotor 20. Further, the “circumferential direction” means the circumferential direction (B1 direction or B2 direction, see FIG. 2) of the rotor 20 (rotor core 21) in a state completed as the rotor 20. The “inner diameter side” means a radial direction (for example, C1 direction, see FIG. 2) side approaching the rotation center C0 of the rotor 20 (rotor core 21) in a state completed as the rotor 20. The “outer diameter side” means a radial direction (for example, C2 direction, see FIG. 2) side away from the rotation center C0 of the rotor 20 (rotor core 21) in a state completed as the rotor 20.

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

  The stator 10 is a stator that is fixed in the rotating electrical machine 100. The stator 10 includes a stator core 11 and a winding 12 wound around the stator core 11. The stator core 11 has a plurality of electromagnetic steel plates 13. The stator core 11 is formed by laminating a plurality of electromagnetic steel plates 13 in the rotation axis direction (Z direction) that is the direction in which the rotation axis C extends. The stator core 11 has a substantially annular shape.

  The rotor 20 is a rotor that can rotate around the rotation axis C. The rotor 20 includes a rotor core 21. The rotor core 21 has a substantially annular shape. In the rotating electrical machine 100, the stator core 11 and the rotor core 21 are disposed so as to face each other in the radial direction.

  The rotor core 21 has a plurality of electromagnetic steel plates 22. The rotor core 21 is formed by laminating a plurality of electromagnetic steel plates 22 in the rotation axis direction (Z direction). The rotor core 21 is provided with a through hole 23 at the rotation center C0. A hub member 30 is attached to the through hole 23 of the rotor core 21. A rotating shaft 31 is attached to the hub member 30. Thereby, the rotating shaft 31 is configured to rotate as the rotor core 21 rotates.

  As shown in FIGS. 1 to 4, the rotor core 21 has a magnet insertion hole 24 into which a permanent magnet 32 is inserted (press-fitted). The magnet insertion hole 24 is a through hole formed so as to extend from one end 21a (see FIG. 3) in the rotation axis direction (Z direction) of the rotor core 21 to the other end 21b (see FIG. 3). The magnet insertion hole 24 is formed in the vicinity of the outer peripheral surface of the rotor core 21. A plurality (16) of magnet insertion holes 24 are provided at equiangular intervals along the circumferential direction. That is, a plurality (16) of permanent magnets 32 inserted into the magnet insertion holes 24 are also provided at equiangular intervals along the circumferential direction. The permanent magnet 32 inserted into the magnet insertion hole 24 is formed so as to extend from one end 21 a in the rotation axis direction of the rotor core 21 to the other end 21 b (see FIG. 3), as with the magnet insertion hole 24. . The permanent magnet 32 inserted into the magnet insertion hole 24 is fixed to the magnet insertion hole 24 with an adhesive 32a (see FIGS. 3 and 4). The permanent magnet 32 is fixed to the magnet insertion hole 24 at a plurality of locations (two locations) by an adhesive 32a extending along the rotation axis direction. The adhesive 32 a is disposed between the inner diameter side of the permanent magnet 32 and the outer diameter side of the magnet insertion hole 24, and fixes the inner diameter side of the permanent magnet 32 and the outer diameter side of the magnet insertion hole 24. . The permanent magnet 32 is an example of the “magnet” in the claims.

  As shown in FIGS. 2 and 3, the rotor core 21 has a welded portion 25 welded by a high energy beam such as a laser beam in order to integrate a plurality of electromagnetic steel plates 22. The welded portion 25 is provided on the inner peripheral surface of the rotor core 21. The welded portion 25 has a convex shape that protrudes toward the inner diameter side (C1 direction side) when viewed from the rotation axis direction (Z direction). Specifically, the welded portion 25 is formed so as to gradually taper toward the inner diameter side when viewed from the rotation axis direction. Further, the welded portion 25 is formed so as to extend along the rotational axis direction from one end portion 21a (see FIG. 3) in the rotational axis direction of the rotor core 21 to the other end portion 21b (see FIG. 3). A plurality (eight) of welded portions 25 are provided at equiangular intervals along the circumferential direction.

  Further, a welded portion 25 a is formed in the welded portion 25. The welded portion 25 a is a welding mark generated in the welded portion 25 when the rotor core 21 is welded. Similarly to the welded portion 25, the welded portion 25a is formed so as to extend from the one end portion 21a of the rotor core 21 in the rotation axis direction to the other end portion 21b along the rotation axis direction. That is, the rotor core 21 is welded along the rotational axis direction from the one end 21a to the other end 21b. In other words, in the rotor core 21, all of the plurality of electromagnetic steel plates 22 are integrated by welding.

  Further, as shown in FIGS. 2 and 4 to 6, the rotor core 21 has cooling fluid passages 26 and 27 through which a cooling fluid F (see FIG. 4) such as oil flows. The cooling fluid F is a fluid for cooling the rotor core 21 and the permanent magnet 32. The cooling fluid passages 26 and 27 are provided on the inner peripheral surface of the rotor core 21. The cooling fluid passages 26 and 27 have a concave shape that is recessed toward the outer diameter side (C2 direction side) when viewed from the rotational axis direction (Z direction). Specifically, the cooling fluid passages 26 and 27 are formed so as to gradually taper toward the outer diameter side when viewed from the rotational axis direction. Further, the cooling fluid passages 26 and 27 extend along the rotational axis direction from one end portion 21a (see FIG. 3) in the rotational axis direction (Z direction) of the rotor core 21 to the other end portion 21b (see FIG. 3). It is formed as follows. In the rotor core 21, the same number of cooling fluid passages (cooling fluid passages 26 and 27) as the magnet insertion holes 24 are provided. Specifically, eight cooling fluid passages 26 and eight cooling fluid passages 27 are provided. The plurality of cooling fluid passages (cooling fluid passages 26 and 27) are provided at equiangular intervals along the circumferential direction so that the cooling fluid passages 26 and 27 are alternately arranged. In the present embodiment, each of the plurality of magnet insertion holes 24 and each of the plurality of cooling fluid passages (cooling fluid passages 26 and 27) are arranged at positions overlapping each other when viewed from the radial direction. .

  Further, as shown in FIGS. 2 and 5, the cooling fluid passage 26 is disposed at a position adjacent to the welded portion 25. Specifically, the cooling fluid passage 26 has a first passage 26 a adjacent to the welded portion 25 and a circumferential direction relative to the welded portion 25 on one side of the welded portion 25 in the circumferential direction. On the other side, a second passage 26 b adjacent to the welded portion 25 is provided. The cooling fluid passage 26 is formed by the first passage 26a and the second passage 26b so as to sandwich the welded portion 25 in the circumferential direction. The welded portion 25 constitutes a part of the cooling fluid passage 26. On the other hand, as shown in FIGS. 2 and 6, the cooling fluid passage 27 is a single passage provided separately from the welded portion 25.

  Here, in this embodiment, as shown in FIG. 4, the rotor core 21 is permanently inserted into the magnet insertion hole 24 from the cooling fluid passage 26 (27) between the electromagnetic steel plates 22 adjacent in the stacking direction. There is a gap D through which the cooling fluid F can flow toward the magnet 32. In FIG. 4, the flow of the cooling fluid F is indicated by white arrows for easy understanding. The rotor core 21 has a thickness T that is larger than the minimum thickness, which is the thickness when there is no gap between the adjacent electromagnetic steel sheets 22. In other words, the minimum product thickness is a predetermined product thickness when converged by pressurization when the product thickness decreases as the applied pressure increases and the product thickness of the rotor core 21 converges to a predetermined product thickness. Further, the stacking thickness T of the rotor core 21 is the length from one end portion 21a to the other end portion 21b of the rotor core 21 in the stacking direction (Z direction) of the electromagnetic steel plates 22.

  In the present embodiment, the gap D between the adjacent electromagnetic steel plates 22 is formed from one end 21 a to the other end 21 b in the rotation axis direction (Z direction) of the rotor core 21. That is, a plurality of gaps D between the adjacent electromagnetic steel sheets 22 are formed between the one end 21 a and the other end 21 b in the rotation axis direction (Z direction) of the rotor core 21. The gap D between the adjacent electromagnetic steel plates 22 is preferably formed for each interval between the adjacent electromagnetic steel plates 22. Further, the gap D between the adjacent electromagnetic steel plates 22 is formed so as to extend in the radial direction from the cooling fluid passage 26 (27) provided on the inner peripheral surface of the rotor core 21 toward the magnet insertion hole 24. ing. Moreover, the clearance gap D between the adjacent electromagnetic steel plates 22 is formed so that it may extend along the circumferential direction over the substantially whole periphery of the rotor core 21 which has a substantially annular shape. Further, the gap D between the adjacent electromagnetic steel plates 22 is held in the magnet insertion hole 24 by the adhesive 32 a disposed in the magnet insertion hole 24.

  In the rotor 20, the cooling fluid F flows from the inner peripheral surface side of the rotor core 21 toward the outer peripheral surface side through the gap D between the adjacent electromagnetic steel plates 22. Specifically, first, the cooling fluid F is introduced from a cooling fluid inlet 30a provided in the hub member 30, and flows into the cooling fluid passage 26 (27). Then, the cooling fluid F flows into the gap D from one end of the gap D that opens to the inner peripheral surface side of the rotor core 21. Then, the cooling fluid F flows in the gap D toward the outer diameter side, and flows on the side surface along the rotation axis direction of the permanent magnet 32 inserted into the magnet insertion hole 24. Then, the cooling fluid F flows out from the other end of the gap D opened on the outer peripheral surface side of the rotor core 21 on the outer peripheral surface side of the rotor core 21. The cooling fluid F that has flowed out from the other end of the gap D returns to the cooling fluid reservoir (not shown) and is circulated.

  Therefore, in this embodiment, the rotor core 21 is cooled between the inner peripheral surface side and the adjacent electromagnetic steel plates 22 by the cooling fluid passage 26 (27) and the cooling fluid F flowing through the gap D, and the permanent magnet 32 is used. The side surface along the rotational axis direction of the is cooled.

  As shown in FIG. 1, the rotor 20 includes a substantially annular end plate 40 disposed at one end 21 a (see FIG. 3) and the other end 21 b (see FIG. 3) of the rotor core 21 in the rotation axis direction. I have. The end plate 40 is configured to support the rotor core 21 from both sides in the rotation axis direction. In the rotor 20, the end plate 40 is welded to the inner peripheral surface of the rotor core 21 together with the hub member 30 by a welded portion 40 a.

(Method for manufacturing rotor)
Next, with reference to FIG. 7, the manufacturing method of the rotor 20 of this embodiment is demonstrated.

  As shown in FIG. 7, first, in step S <b> 1, a plurality of electromagnetic steel plates 22 each having an annular shape are stacked in the rotation axis direction. Each laminated electromagnetic steel sheet 22 has a through hole corresponding to the magnet insertion hole 24 and a recess corresponding to the cooling fluid passage 26 (27). In step S1, the rotor core 21 having the magnet insertion hole 24 and the cooling fluid passage 26 (27) is formed by laminating the plurality of electromagnetic steel plates 22.

  Next, in step S <b> 2, the permanent magnet 32 is inserted (press-fitted) into each magnet insertion hole 24 of the rotor core 21.

  Next, in step S3, the permanent magnet 32 inserted into the magnet insertion hole 24 of the rotor core 21 is fixed by the adhesive 32a while being pressurized in the rotation axis direction (Z direction). In the present embodiment, the magnet insertion hole 24 of the rotor core 21 in a state where the rotor core 21 having the gap D between the adjacent electromagnetic steel plates 22 is pressurized with a pressing force that does not eliminate the gap between the adjacent electromagnetic steel plates 22. The permanent magnet 32 inserted in is fixed by an adhesive 32a. In other words, the rotor core 21 having the gap D between the adjacent electromagnetic steel plates 22 is pressurized with a pressure (for example, 1 kN) smaller than the pressure (for example, 20 kN or more) at which the rotor core 21 has a minimum thickness. In this state, the permanent magnet 32 inserted into the magnet insertion hole 24 of the rotor core 21 is fixed by the adhesive 32a. In step S <b> 3, the gap D between the adjacent electromagnetic steel sheets 22 is held by the adhesive 32 a and the permanent magnet 32 is fixed to the magnet insertion hole 24.

  Next, in step S4, the rotor core 21 is welded while being pressurized in the rotation axis direction (Z direction). In the present embodiment, the rotor core 21 is welded in a state where the rotor core 21 having the gap D between the adjacent electromagnetic steel plates 22 is pressurized with a pressing force that does not eliminate the gap D between the adjacent electromagnetic steel plates 22. . In other words, the rotor core 21 having the gap D between the adjacent electromagnetic steel plates 22 is pressurized with a pressure (for example, 1 kN) smaller than the pressure (for example, 20 kN or more) at which the rotor core 21 has a minimum thickness. In the state, the rotor core 21 is welded.

  In step S4, one end of the rotor core 21 in the rotational axis direction is moved by moving the welding head relative to the welded portion 25 of the rotor core 21 while outputting a high energy beam from a welding head (not shown). The rotor core 21 is welded from 21a to the other end 21b. As a result, a welded portion 25 a is formed in the welded portion 25. Further, the total eight welded portions 25 are welded one by one, not simultaneously.

  In steps S 3 and 4, the rotor core 21 is pressurized so that the density of the rotor core 21 is equal to or higher than the density of the stator core 11. Therefore, in the present embodiment, the density of the rotor core 21 is equal to or higher than the density of the stator core 11 in a state where the rotor 20 is completed. The density of the rotor core 21 (stator core 11) is obtained by dividing the mass of the rotor core 21 (stator core 11) by the volume of the rotor core 21 (stator core 11). Therefore, if the number of electromagnetic steel plates 22 (13) forming the rotor core 21 (stator core 11) does not change, the larger the thickness T of the rotor core 21 (stator core 11) (the larger the gap D), the more the rotor core 21 (stator core 11). ) Density is small. When the thickness is the minimum (when there is no gap D), the density of the rotor core 21 (stator core 11) is the highest. It should be noted that the pressing force at the time of fixing the permanent magnet 32 and the pressing force at the time of welding the rotor core 21 may be the same value as long as the gap D between the adjacent electromagnetic steel plates 22 is not lost. The values may be different from each other.

  Thereafter, the end plate 40 and the hub member 30 are arranged at predetermined positions where welding is possible, and are welded to the inner peripheral surface of the rotor core 21. Then, the rotor 20 is completed. As mentioned above, in the manufacturing method of the rotor 20 of this embodiment, there is no process of pressurizing with such a high pressurization force that the gap D between the adjacent electromagnetic steel sheets 22 is eliminated. As a result, in this embodiment, the cooling fluid F is caused to flow from the cooling fluid passage 26 (27) toward the permanent magnet 32 inserted into the magnet insertion hole 24 between the electromagnetic steel plates 22 adjacent to the rotor core 21. The rotor 20 is completed with the gap D that can be

(Effect of this embodiment)
In the present embodiment, the following effects can be obtained.

  In the present embodiment, as described above, the rotor core (21) is inserted into the magnet insertion hole (24) from the cooling fluid passages (26, 27) between the electromagnetic steel plates (22) adjacent in the stacking direction. And a gap (D) through which the cooling fluid (F) can flow toward the permanent magnet (32). As a result, the cooling fluid (F) is directly applied to the side surface along the rotation axis direction of the permanent magnet (32), and the side surface along the rotation axis direction of the permanent magnet (32) is applied to the cooling fluid (F). Can be cooled directly. As a result, the permanent magnet (32) inserted into the magnet insertion hole (24) of the rotor core (21) can be effectively cooled compared to the case where the permanent magnet (32) is indirectly cooled. As in this embodiment, the effect is that the magnet insertion hole (24) (permanent magnet (32)) cools the rotor core (21) by the cooling fluid (F) flowing through the cooling fluid passages (26, 27). It is particularly effective when it is arranged on the side (outer peripheral surface side) opposite to the side where the inner side is performed (inner peripheral surface side). Moreover, since the rotor core (21) can be cooled from the inside by flowing the cooling fluid (F) through the gap (D) between the adjacent electromagnetic steel plates (22), it is inserted into the magnet insertion hole (24). In addition to the permanent magnet (32), the rotor core (21) can be effectively cooled.

  In the present embodiment, as described above, the magnet insertion hole (24), the permanent magnet (32), and the cooling fluid passage (26, 27) are arranged at one end (21a) of the rotor core (21) in the rotation axis direction. ) To the vicinity of the other end (21b) so as to extend along the rotation axis direction. And the clearance gap (D) between adjacent electromagnetic steel plates (22) is formed ranging from the one end part (21a) of the rotation axis direction of a rotor core (21) to the other end part (21b). If comprised in this way, the side surface along the rotation axis direction of a permanent magnet (32) is directly covered over the wide range from the one end part (21a) of the rotation axis direction of a rotor core (21) to the other end part (21b). Can be cooled.

  In the present embodiment, as described above, the cooling fluid passages (26, 27) are provided on the inner peripheral surface of the rotor core (21). The magnet insertion hole (24) is provided on the outer peripheral surface side of the rotor core 21. In the rotor 20, the cooling fluid (F) flows from the inner peripheral surface side to the outer peripheral surface side of the rotor core (21) through the gap (D) between the adjacent electromagnetic steel plates (22). It is configured. If comprised in this way, when a rotor (20) rotates, it will promote that the fluid (F) for cooling flows into a clearance gap (D) using a centrifugal force, and will improve a cooling effect more. Can do.

  Moreover, in this embodiment, as above-mentioned, the clearance gap (D) between adjacent electromagnetic steel plates (22) is from the cooling fluid channel | path (26, 27) provided in the internal peripheral surface of the rotor core (21). It is formed so as to extend along the radial direction toward the magnet insertion hole (24). With this configuration, the cooling fluid (F) that has entered the gap (D) from the cooling fluid passages (26, 27) can be easily guided to the permanent magnet (32) inserted into the magnet insertion hole (24). Thus, the permanent magnet (32) can be cooled.

  Moreover, in this embodiment, as above-mentioned, the permanent magnet (32) is being fixed to the magnet insertion hole (24) with the adhesive agent (32a), and the clearance gap between the adjacent electromagnetic steel plates (22) ( D) is held by the adhesive (32a). If comprised in this way, since it can suppress that the clearance gap (D) between adjacent electromagnetic steel plates (22) is lose | eliminated, the cooling which entered the clearance gap (D) from the cooling fluid channel | path (26, 27). The working fluid (F) can be more reliably guided to the permanent magnet (32) inserted into the magnet insertion hole (24), and the permanent magnet (32) can be cooled more reliably.

  In the present embodiment, as described above, a plurality of magnet insertion holes (24) are provided at predetermined angular intervals along the circumferential direction. A plurality of cooling fluid passages (26, 27) are provided at predetermined angular intervals along the circumferential direction. Each of the plurality of magnet insertion holes (24) and each of the plurality of cooling fluid passages (26, 27) are arranged at positions overlapping each other when viewed from the radial direction. With this configuration, the radial distance from the cooling fluid passage (26, 27) to the permanent magnet (32) inserted into the magnet insertion hole (24) can be shortened, so that the gap (D) The cooling fluid (F) that has entered from above can be applied to the side surface of the permanent magnet (32) along the rotational axis direction more vigorously. As a result, the permanent magnet (32) inserted into the magnet insertion hole (24) of the rotor core (21) can be more effectively cooled.

  In the present embodiment, as described above, the density of the rotor core (21) is equal to or higher than the density of the stator core (11) arranged to face the rotor core (21). Here, when the rotor core (21) has a gap (D) between the adjacent electromagnetic steel sheets (22), the rotor core (21) has the same amount as the gap (D) between the adjacent electromagnetic steel sheets (22). Density decreases. In this case, due to the density of the rotor core (21) being small, in the rotating electrical machine (100) including the rotor core (21), performance such as torque characteristics may be deteriorated. Then, if comprised as mentioned above, even if a rotor core (21) has a clearance gap (D) between the adjacent electromagnetic steel plates (22), the density of the rotor core (21) is the density of the stator core (11). As described above, the performance of the rotating electrical machine (100) including the rotor core (21) and the stator core (11) due to the rotor core (21) having a gap (D) between the adjacent electromagnetic steel plates (22). Can be prevented from decreasing.

  Moreover, in this embodiment, the manufacturing method of the rotor (20) is as described above, and the gap (D) between the adjacent electromagnetic steel sheets (22) is applied with the applied pressure so that the adjacent electromagnetic steel sheets (22) are not lost. A step of fixing the permanent magnet (32) inserted into the magnet insertion hole (24) of the rotor core (21) in a state where the rotor core (21) having a gap (D) therebetween is pressurized. If comprised in this way, in the process which fixes the permanent magnet (32) inserted in the magnet insertion hole (24) of the rotor core (21) which is a pressurization process, the clearance gap between adjacent electromagnetic steel plates (22) ( The permanent magnet (32) inserted into the magnet insertion hole (24) of the rotor core (21) can be fixed while leaving the gap (D) between the adjacent electromagnetic steel sheets (22) without losing D). it can.

  In the present embodiment, as described above, the step of fixing the permanent magnet (32) inserted into the magnet insertion hole (24) of the rotor core (21) is performed by using the adhesive (32a) with an adjacent electrical steel sheet ( 22) is a step of holding the gap (D) between the permanent magnets (32) and fixing the permanent magnets (32) to the magnet insertion holes (24). If comprised in this way, it can suppress that the clearance gap (D) between adjacent electromagnetic steel plates (22) is lose | eliminated in the state which the rotor (20) completed.

  Moreover, in this embodiment, the manufacturing method of the rotor (20) is as described above, and the gap (D) between the adjacent electromagnetic steel sheets (22) is applied with the applied pressure so that the adjacent electromagnetic steel sheets (22) are not lost. A step of welding the rotor core (21) in a state where the rotor core (21) having a gap (D) therebetween is pressurized. If comprised in this way, in the process of welding the rotor core (21) which is a pressurization process, it will not eliminate the gap (D) between adjacent electromagnetic steel plates (22), but between adjacent electromagnetic steel plates (22). The rotor core (21) can be welded while leaving the gap (D).

  In the present embodiment, as described above, the step of inserting the permanent magnet (32) into the magnet insertion hole (24) of the rotor core (21) is performed before the step of welding the rotor core (21). ) In which the permanent magnet (32) is inserted into the magnet insertion hole (24). Here, as shown in FIGS. 8A and 8B, when the rotor core (21) is welded, the rotor core (21) contracts the welded portion (25a) due to the contraction of the welded portion (25a). Deforms accordingly. Therefore, if configured as described above (as shown in FIG. 8 (B)), the permanent magnet (32) is not inserted into the magnet insertion hole (24) of the rotor core (21) as shown in FIG. 8 (A). Compared to the case where the rotor core (21) is welded in the state, the permanent magnet (32) inserted into the magnet insertion hole (24) of the rotor core (21) causes the rotor core (21) to respond to contraction of the welded portion (25a). The deformation of the rotor core (21) according to the shrinkage of the welded portion (25a) can be reduced. Further, since the deformation of the rotor core (21) according to the shrinkage of the welded portion (25a) can be suppressed, the amount of the deformation is caused by the deformation of the rotor core (21) according to the shrinkage of the welded portion (25a). It can suppress that the clearance gap (D) between adjacent electromagnetic steel plates (22) becomes small. In FIGS. 8A and 8B, the deformed rotor core (21) is schematically shown by a two-dot chain line.

[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 above-described embodiment, the example in which the cooling fluid flows from the inner peripheral surface side of the rotor core toward the outer peripheral surface side through the gap between the adjacent electromagnetic steel sheets is shown, but the present invention is not limited thereto. I can't. For example, the cooling fluid may flow from the outer peripheral surface side of the rotor core toward the inner peripheral surface side through a gap between adjacent electromagnetic steel sheets.

  Moreover, in the said embodiment, although the several magnetic steel plate was integrated by welding in the state in which the rotor core had the clearance gap between the adjacent magnetic steel plates, this invention is not limited to this. For example, a plurality of electromagnetic steel sheets may be integrated by fastening members such as bolts and nuts in a state where the rotor core has a gap between adjacent electromagnetic steel sheets.

  In the above embodiment, the rotor core has two types of cooling fluid passages, that is, a cooling fluid passage disposed adjacent to the welded portion and a cooling fluid passage not adjacent to the welded portion. However, the present invention is not limited to this. In the present invention, the rotor core may have only the cooling fluid passage disposed adjacent to the welded portion, or may include only the cooling fluid passage not adjacent to the welded portion. Good.

  Moreover, in the said embodiment, before the process of welding a rotor core, the example which performs the process of inserting a magnet in the magnet insertion hole of a rotor core, and the process of fixing the magnet inserted in the magnet insertion hole of a rotor core was shown. However, the present invention is not limited to this. For example, after the step of welding the rotor core, a step of inserting a magnet into the magnet insertion hole of the rotor core and a step of fixing the magnet inserted into the magnet insertion hole of the rotor core may be performed. In addition, a step of inserting a magnet into the magnet insertion hole of the rotor core is performed before the step of welding the rotor core, and a step of fixing the magnet inserted into the magnet insertion hole of the rotor core is performed after the step of welding the rotor core. May

  In the above embodiment, an example is shown in which the magnet insertion hole, the magnet, and the cooling fluid passage are formed from one end to the other end in the rotation axis direction of the rotor core. However, the present invention is not limited thereto. Absent. In the present invention, the magnet insertion hole, the magnet, and the cooling fluid passage may be formed from the vicinity of one end in the rotation axis direction of the rotor core to the vicinity of the other end.

  Moreover, in the said embodiment, although the one magnet was inserted in the magnet insertion hole, and the example fixed with the adhesive agent was shown, this invention is not limited to this. In the present invention, a plurality of (two) permanent magnets 132 may be inserted into the magnet insertion hole 24 and fixed by an adhesive 32a as in the modification shown in FIG. The permanent magnet 132 is an example of the “magnet” in the claims.

DESCRIPTION OF SYMBOLS 20 Rotor 21 Rotor core 21a One end part 21b The other end part 22 Magnetic steel plate 24 Magnet insertion hole 25 Welded part 26, 27 Cooling fluid path 32, 132 Permanent magnet (magnet)
D Clearance F Cooling fluid

Claims (12)

A rotor core having a magnet insertion hole and a cooling fluid passage through which a cooling fluid flows, and a plurality of electromagnetic steel plates laminated;
A magnet inserted into the magnet insertion hole of the rotor core,
The rotor core has a gap that allows the cooling fluid to flow from the cooling fluid passage toward the magnet inserted into the magnet insertion hole between the electromagnetic steel plates adjacent in the stacking direction. Rotor. The magnet insertion hole, the magnet, and the cooling fluid passage are formed so as to extend along the rotation axis direction from the vicinity of one end portion in the rotation axis direction of the rotor core to the vicinity of the other end portion,
The rotor according to claim 1, wherein the gap between the adjacent electromagnetic steel sheets is formed from one end to the other end of the rotor core in the rotation axis direction. The cooling fluid passage is provided on an inner peripheral surface of the rotor core,
The magnet insertion hole is provided on the outer peripheral surface side of the rotor core,
The said cooling fluid is comprised so that it may flow toward the outer peripheral surface side from the internal peripheral surface side of the said rotor core through the said clearance gap between the said adjacent electromagnetic steel plates. Rotor.   The gap between the adjacent electromagnetic steel sheets is formed so as to extend in a radial direction from the cooling fluid passage provided on the inner peripheral surface of the rotor core toward the magnet insertion hole. Item 4. The rotor according to item 3. The magnet is fixed to the magnet insertion hole by an adhesive,
The rotor according to any one of claims 1 to 4, wherein the gap between the adjacent electromagnetic steel sheets is held by the adhesive. A plurality of the magnet insertion holes are provided at predetermined angular intervals along the circumferential direction,
A plurality of the cooling fluid passages are provided at predetermined angular intervals along the circumferential direction,
The rotor according to any one of claims 1 to 5, wherein each of the plurality of magnet insertion holes and each of the plurality of cooling fluid passages are arranged at positions overlapping each other when viewed from the radial direction. .   The rotor according to any one of claims 1 to 6, wherein a density of the rotor core is equal to or higher than a density of a stator core disposed to face the rotor core. Laminating a plurality of electromagnetic steel sheets to form a rotor core having a magnet insertion hole and a cooling fluid passage through which a cooling fluid flows;
Inserting a magnet into the magnet insertion hole of the rotor core;
In a state where there is a gap between the electromagnetic steel plates adjacent to the rotor core so that the cooling fluid can flow from the cooling fluid passage toward the magnet inserted into the magnet insertion hole. And a step of completing the method.   The magnet inserted into the magnet insertion hole of the rotor core in a state where the rotor core having a gap between the adjacent electromagnetic steel sheets is pressurized with a pressing force that does not eliminate the gap between the adjacent electromagnetic steel sheets. The method for manufacturing a rotor according to claim 8, further comprising a step of fixing the rotor.   The step of fixing the magnet inserted into the magnet insertion hole of the rotor core is a step of holding a gap between the adjacent electromagnetic steel sheets with an adhesive and fixing the magnet to the magnet insertion hole. A method for manufacturing a rotor according to claim 9.   The method further comprises the step of welding the rotor core in a state in which the rotor core having a gap between the adjacent electromagnetic steel sheets is pressurized with a pressing force that does not eliminate a gap between the adjacent electromagnetic steel sheets. The manufacturing method of the rotor of any one of 10-10.   The rotor according to claim 11, wherein the step of inserting the magnet into the magnet insertion hole of the rotor core is a step of inserting the magnet into the magnet insertion hole of the rotor core before the step of welding the rotor core. Manufacturing method.

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