Patent Publication Number: US-2020280226-A1

Title: Rotor of rotary electric machine

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application claims the benefit of priority of Japanese Patent Application No. 2019-037601, filed on Mar. 1, 2019, the content of which is incorporated herein by reference. 
     TECHNICAL FIELD 
     The present invention relates to a rotor of a rotary electric machine mounted on an electric vehicle or the like. 
     BACKGROUND ART 
     In recent years, rotary electric machines have been used in hybrid vehicles and EV vehicles. When a rotary electric machine rotates, the temperature of a magnet increases, which greatly affects the performance of the rotary electric machine. Therefore, proper cooling is required. 
     JP-A-2017-070148 describes that, in an Interior Permanent Magnet Motor (IPM motor), a first plate having a first refrigerant passage and a second plate having a second refrigerant passage are stacked one by one to form a refrigerant distribution plate. 
     The rotary electric machine described in JP-A-2017-070148 is an IPM motor, so it cannot be directly applied to a Surface Permanent Magnet Motor (SPM motor) having a magnet fixed to the outer peripheral surface of a rotor. 
     Further, in the rotary electric machine of JP-A-2017-070148, a refrigerant passes through a vicinity of the magnet and is discharged to the outer peripheral side, there is a possibility that the magnet cannot be cooled appropriately. 
     SUMMARY 
     The invention provides a rotor of a rotary electric machine which can appropriately cool a magnet disposed on an outer peripheral surface of a rotor core. 
     According to an aspect of the invention, there is provided a rotor of a rotary electric machine including: a rotor core; a plurality of magnets arranged on an outer peripheral surface of the rotor core; and a rotor shaft rotating integrally with the rotor core, wherein: the rotor shaft includes an in-shaft flow path through which a refrigerant is supplied; the rotor core includes: a plurality of magnet attaching grooves formed on the outer peripheral surface of the rotor core and in which the magnets are disposed; an in-core flow path extending inside the rotor core in an axial direction of the rotor core; and a refrigerant distribution plate; the refrigerant distribution plate includes: a first refrigerant distribution plate in which an inner-diameter-side refrigerant flow path extending from the in-shaft flow path toward the in-core flow path as viewed from the axial direction is formed; and a second refrigerant distribution plate in which an outer-diameter-side refrigerant flow path extending from the in-core flow path toward the magnet attaching groove as viewed from the axial direction is formed; and the first refrigerant distribution plate and the second refrigerant distribution plate are stacked in the axial direction. 
     According to the invention, the magnet can be cooled from the inside of the rotor core by the refrigerant supplied to an in-rotor-core flow path and the magnet can be directly cooled by the refrigerant supplied to the magnet attaching groove, so that the magnet can be appropriately cooled. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of a rotor of a rotary electric machine according to an embodiment of the invention; 
         FIG. 2  is an exploded perspective view of a rotor core of the rotary electric machine in  FIG. 1 ; 
         FIG. 3  is a perspective view of a refrigerant distribution plate of the rotor of the rotary electric machine in  FIG. 1 ; 
         FIG. 4  is an exploded perspective view in which a part of the refrigerant distribution plate is exploded to explain an outer diameter side refrigerant flow path: 
         FIG. 5  is an enlarged view of a part of the refrigerant distribution plate: 
         FIG. 6  is a view of a first refrigerant distribution plate as viewed from an axial direction; and 
         FIG. 7  is a view of a second refrigerant distribution plate as viewed from the axial direction. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     An embodiment of a rotor of a rotary electric machine according to the invention will be described below with reference to  FIGS. 1 to 7 . 
     In the following description, the term “rotation axis C” refers to a central axis when a rotor  10  or a rotor shaft  20  of the rotary electric machine rotates and an axial direction refers to a direction along the rotation axis C. In addition, the term “circumferential direction” refers to a direction along a circumference of a circle drawn around a point in a state where the rotation axis C is seen as the point. Further, the term “radial direction” refers to a direction from the point to the circle or a direction from the circle to the point. The term “radially outward” means a direction from the point toward the circle. The term “radially inward” means a direction from the circle toward the point. 
     As illustrated in  FIGS. 1 and 2 , the rotor  10  of the rotary electric machine according to the embodiment includes the rotor shaft  20 , a rotor core  30  supported by the rotor shaft  20 , a refrigerant distribution plate  80  interposed in the rotor core  30 , and a pair of end plates  50  arranged in the axial direction of the rotor core  30 . 
     The rotor  10  of the rotary electric machine is a so-called SPM-type rotary electric machine in which magnets  41  are arranged on a surface of the rotor core  30 . The magnets  41  are arranged in a magnet attaching groove  41 A provided on the outer peripheral surface of the rotor core  30  and the magnet attaching groove  41 A provided on the outer peripheral surface of the refrigerant distribution plate  80 . The outer diameter of the rotor core  30  on which the magnet  41  is disposed is set to be substantially the same as the outer diameter of the refrigerant distribution plate  80  on which the magnet  41  is disposed. A sleeve  40  of a cylindrical shape is provided on the outer peripheral surfaces of the rotor core  30  and the refrigerant distribution plate  80  to prevent the magnets  41  from coming off the magnet attaching grooves  41 A. The outer diameter means a distance from the rotation axis C. 
     Inside the rotor shaft  20 , an in-shaft flow path  21  through which the refrigerant flows is formed. The in-shaft flow path  21  extends in the axial direction inside the rotor shaft  20  and is configured so that the refrigerant can be supplied from the outside. As the refrigerant, for example, Automatic Transmission Fluid (ATF) is used and a circulation path is formed so that the ATF circulates between a transmission case and a motor housing. 
     On the rotor shaft  20 , one or more refrigerant supply portions (not illustrated) for sending the refrigerant from the in-shaft flow path  21  to the rotor core  30  side are formed in communication with the in-shaft flow path  21 . 
     The rotor core  30  is configured by stacking a plurality of electromagnetic steel sheets. As illustrated in  FIG. 2 , the rotor core  30  includes a first rotor core  30 A and a second rotor core  30 B. The first rotor core  30 A and the second rotor core  30 B are arranged so as to face each other across the refrigerant distribution plate  80  in the axial direction. In the embodiment, the refrigerant distribution plate  80  is disposed substantially at the center of the rotor core  30  in the axial direction. 
     The refrigerant distribution plate  80  may be disposed on one side in the axial direction with respect to the first rotor core  30 A and the second rotor core  30 B. However, by arranging the refrigerant distribution plate  80  approximately at the center of the first rotor core  30 A and the second rotor core  30 B in the axial direction, the temperature distribution of the magnets  41  in the axial direction can be suppressed as compared with a case where the refrigerant distribution plate  80  is arranged on one side of the first rotor core  30 A and the second rotor core  30 B. 
     A shaft insertion hole  32  is formed in the center of the rotor core  30  and the refrigerant distribution plate  80 , penetrating in the axial direction and into which the rotor shaft  20  is inserted. It is preferable that the electromagnetic steel sheets constituting the rotor core  30  have the same shape and that the respective sheet thicknesses (lengths in the axial direction) be set to substantially the same sheet thickness. The rotor shaft  20  is inserted into the shaft insertion holes  32  of the rotor core  30  and the refrigerant distribution plate  80  and the shaft insertion holes  51  of the pair of end plates  50 , so the rotor shaft  20 , the rotor core  30 , the refrigerant distribution plate  80 , and the pair of end plates  50  are assembled so as to rotate integrally. 
     In the rotor core  30 , a plurality (eight in the embodiment) of in-core flow paths  31  formed at equal intervals in the circumferential direction are formed inside the rotor core  30  for flowing the refrigerant. 
     On the outer peripheral surface of the rotor core  30 , the magnet attaching grooves  41 A described above are provided at equal intervals in the circumferential direction. Further, a partition portion  43  is provided in a portion between the magnet attaching grooves  41 A adjacent in the circumferential direction, so that the outer diameter of the partition portion  43  is set to be substantially the same as the outer diameter of the magnet  41  arranged in the magnet attaching groove  41 A. On both sides of the magnet attaching groove  41 A, shoulder portions  44  each of which is larger than the outer diameter of the magnet attaching groove  41 A and smaller than the outer diameter of the partition portion  43  are provided, so a flux barrier  34  is formed between the partition portion  43  and the side surface of the magnet  41  by the shoulder portion  44 . 
     In the rotor core  30 , the above-described refrigerant distribution plate  80  connecting the refrigerant supply portion of the rotor shaft  20  and the in-core flow path  31  of the rotor core  30  is interposed. As illustrated in  FIG. 3 , the first refrigerant distribution plate  81  and the second refrigerant distribution plate  82  are stacked in the axial direction. More specifically, the refrigerant distribution plate  80  includes a pair of first refrigerant distribution plates  81  and a second refrigerant distribution plate  82  interposed between the pair of first refrigerant distribution plates  81 . 
     As illustrated in  FIG. 6 , the first refrigerant distribution plate  81  is formed with an inner-diameter-side refrigerant flow path  81 A extending from the in-shaft flow path  21  to the in-core flow path  31  when viewed from the axial direction. On the outer peripheral surface of the first refrigerant distribution plate  81 , a magnet attaching groove  41 A, a partition portion  43 , and the shoulder portion  44  are provided at the same circumferential position as the magnet attaching groove  41 A of the rotor core  30 . 
     As illustrated in  FIG. 7 , the second refrigerant distribution plate  82  has an outer-diameter-side refrigerant flow path  82 A extending from the in-core flow path  31  toward the magnet attaching groove  41 A when viewed from the axial direction. On the outer peripheral surface of the second refrigerant distribution plate  82 , a magnet attaching groove  41 A is provided at the same position in the circumferential direction as the magnet attaching groove  41 A of the rotor core  30 . Further, outlet of the outer-diameter-side refrigerant flow path  82 A is provided between the circumferentially adjacent magnet attaching grooves  41 A with the shoulder portions  44 , which provided on both sides of the magnet attaching grooves  41 A, interposed therebetween. That is, the partition portion  43  is not provided in the second refrigerant distribution plate  82  and a space is formed between the outer peripheral surface (shoulder portion  44 ) of the second refrigerant distribution plate  82  and the sleeve  40 . 
     According to this, since the refrigerant flowing through the in-shaft flow path  21  is supplied to the in-core flow path  31  via the inner-diameter-side refrigerant flow path  81 A provided in the first refrigerant distribution plate  81 , the magnet  41  can be cooled from inside the rotor core  30  by the refrigerant flowing through the in-core flow path  31 . In the embodiment, by providing two first refrigerant distribution plates  81 , there are a total of sixteen inner-diameter-side refrigerant flow paths  81 A, eight in the circumferential direction and two in the axial direction. A part of the refrigerant passing through the inner-diameter-side refrigerant flow path  81 A is supplied to an outer-diameter-side refrigerant flow path  82 A provided in the second refrigerant distribution plate  82 . In the embodiment, by providing one second refrigerant distribution plate  82 , there are a total of eight outer-diameter-side refrigerant flow paths  82 A, eight in the circumferential direction and one in the axial direction. 
     Here, the inner-diameter-side refrigerant flow path  81 A and the outer-diameter-side refrigerant flow path  82 A constitute a first refrigerant flow path  11  extending from the in-shaft flow path  21  through the in-core flow path  31  and further in the radial direction of the rotor core  30 . Also, at the outlet of the outer-diameter-side refrigerant flow path  82 A, a second refrigerant flow path  12  is formed by a space formed between the outer peripheral surface (shoulder portion  44 ) of the second refrigerant distribution plate  82  and the sleeve  40 . The second refrigerant flow path  12  is connected to the first refrigerant flow path  11  and extends in the circumferential direction of the rotor core  30 . The refrigerant flowing in the second refrigerant flow path  12  in the circumferential direction is supplied to the magnet attaching grooves  41 A on both sides of the outer-diameter-side refrigerant flow path  82 A through the space between the partition portions  43  of the pair of first refrigerant distribution plates  81  opposed in the axial direction. 
     Further, the space between the shoulder portions  44  provided on both sides of the magnet attaching groove  41 A and the sleeve  40  constitutes a third refrigerant flow path  13 . In other words, the third refrigerant flow path  13  is constituted by the flux barrier  34  and the sleeve  40 . The third refrigerant flow path  13  is connected to the second refrigerant flow path  12  and extends in the axial direction along a plurality of magnets  41 . Therefore, the refrigerant supplied to the outer-diameter-side refrigerant flow path  82 A is supplied to the third refrigerant flow path  13  via the second refrigerant flow path  12 , so that the magnet  41  can be directly cooled. 
     The refrigerant distribution plate  80  is preferably made of the same material as the rotor core  30  and is more preferably formed by stacking electromagnetic steel sheets. Accordingly, the refrigerant distribution plate  80  has both a function of generating torque and a function of distributing the refrigerant and can suppress a decrease in torque due to the member which distributes the refrigerant. 
     Further, as illustrated in  FIG. 6 , the first refrigerant distribution plate  81  includes a first refrigerant storage portion  81 B provided so as to overlap the in-core flow path  31  in the circumferential direction of the rotor core  30 . The inner-diameter-side refrigerant flow path  81 A extends in the radial direction of the rotor core  30  from the in-shaft flow path  21  toward the first refrigerant storage portion  81 B. As illustrated in  FIG. 7 , the second refrigerant distribution plate  82  includes a second refrigerant storage portion  82 B provided so as to overlap the in-core flow path  31  in the circumferential direction of the rotor core  30 . The outer-diameter-side refrigerant flow path  82 A extends in the radial direction from the second refrigerant storage portion  82 B toward the magnet attaching groove  41 A. The first refrigerant storage portion  81 B and the second refrigerant storage portion  82 B have substantially the same shape as the in-core flow path  31  and are configured such that the radially inner side forms a triangle base and the radially outer side forms a triangle vertex when viewed from the axial direction. Each vertex of the triangles is formed in an R shape. 
     According to this, by the first refrigerant storage portion  81 B and the second refrigerant storage portion  82 B provided to overlap with the in-core flow path  31  in the circumferential direction of the rotor core  30 , the refrigerant flowing from the inner-diameter-side refrigerant flow path  81 A to the in-core flow path  31  and the refrigerant flowing from the inner-diameter-side refrigerant flow path  81 A to the outer-diameter-side refrigerant flow path  82 A can be appropriately separated. 
     Here, as illustrated in  FIG. 5 , an axial width L 1  of the first refrigerant distribution plate  81  is wider than an axial width L 2  of the second refrigerant distribution plate  82  (L 1 &gt;L 2 ). By making the axial width L 1  of the first refrigerant distribution plate  81  wider than the axial width L 2  of the second refrigerant distribution plate  82 , the amount of refrigerant flowing from the inner-diameter-side refrigerant flow path  81 A to the outer-diameter-side refrigerant flow path  82 A can be appropriately adjusted. In addition, the dimensions of the widths L 1  and L 2  can be appropriately changed in consideration of the relationship between the amount of the refrigerant flowing through the in-core flow path  31  and the amount of the refrigerant flowing through the outer-diameter-side refrigerant flow path  82 A. 
     As illustrated in  FIG. 2 , a plurality of the in-core flow paths  31 , the first refrigerant storage portions  81 B, and the second refrigerant storage portions  82 B are arranged at predetermined intervals in the circumferential direction. In addition, the in-core flow path  31 , the first refrigerant storage portion  81 B, and the second refrigerant storage portion  82 B overlap at substantially the same position and substantially the same shape when viewed from the axial direction. As described above, since the in-core flow paths  31 , the first refrigerant storage portions  81 B, and the second refrigerant storage portions  82 B are arranged at predetermined intervals in the circumferential direction, the temperature distribution of the magnets  41  in the circumferential direction can be reduced. 
     As illustrated in  FIGS. 2 and 3 , the inner-diameter-side refrigerant flow path  81 A and the outer-diameter-side refrigerant flow path  82 A extend in the radial direction between the magnets  41  adjacent in the circumferential direction. The inner-diameter-side refrigerant flow path  81 A and the outer-diameter-side refrigerant flow path  82 A extend in the radial direction between the magnets  41  adjacent in the circumferential direction, so the refrigerant can be supplied to the magnets  41  adjacent in the circumferential direction through one set of the inner-diameter-side refrigerant flow path  81 A and the outer-diameter-side refrigerant flow path  82 A. 
     Further, as illustrated in  FIG. 7 , the outer-diameter-side refrigerant flow path  82 A has a wider circumferential width from the second refrigerant storage portion  82 B to the magnet attaching groove  41 A. In the embodiment, an angle ANG between a surface  82 C and a surface  82 D of the outer-diameter-side refrigerant flow path  82 A is formed to be larger than 0°. This allows the refrigerant flowing through the outer-diameter-side refrigerant flow path  82 A to flow smoothly toward the magnet attaching groove  41 A. 
     Next, the refrigerant flowing through the refrigerant distribution plate  80  will be described more specifically with reference to  FIGS. 4 and 5 . 
     The refrigerant flowing in a direction of an arrow AR 0  through the inner-diameter-side refrigerant flow path  81 A (first refrigerant flow path  11 ) of the first refrigerant distribution plate  81  temporarily stays in the first refrigerant storage portion  81 B and the second refrigerant storage portion  82 B and a part of the refrigerant is supplied to the in-core flow path  31  of the first rotor core  30 A and the in-core flow path  31  of the second rotor core  30 B as indicated by arrows AR 1  and AR 2 . 
     Also, the remaining refrigerant temporarily staying in the first refrigerant storage portion  81 B and the second refrigerant storage portion  82 B flows through the outer-diameter-side refrigerant flow path  82 A (first refrigerant flow path  11 ) as shown by an arrow AR 3  and hits the sleeve  40  (see  FIG. 1 ). Then, as indicated by arrows AR 4  and AR 5 , the flow is changed to flows toward both sides in the circumferential direction and the refrigerant flows through the second refrigerant flow path  12 . Next, the refrigerant hits the side surface of the magnet  41 , changes the flow to flow toward both sides in the axial direction, and flows through the third refrigerant flow path  13 . That is, the refrigerant flowing through the second refrigerant flow path  12  indicated by the arrow AR 4  flows in the third refrigerant flow path  13  in the axial direction along the side surface of the magnet  41  as indicated by arrows AR 9  and AR 10 . On the other hand, the refrigerant flowing through the second refrigerant flow path  12  indicated by the arrow AR 5  flows in the axial direction through the third refrigerant flow path  13  along the side surface of the magnet  41  as indicated by arrows AR 7  and AR 8 . 
     In addition, when a difference appears in the supply balance of the refrigerant to one magnet  41  and the other magnet  41  due to the rotation effect of the rotor  10  of the rotary electric machine, by individually setting the width (cross-sectional area of oil passage) of the shoulder portion  44  of the second refrigerant distribution plate  82  in one and the other, one and the other can arbitrarily control the supply balance of the refrigerant supplied to the third refrigerant flow path  13 . For example, as illustrated in  FIG. 5 , when the refrigerant flowing in the directions of the arrows AR 7  and AR 8  is more than the refrigerant flowing in the directions of the arrows AR 9  and AR 10 , in order to reduce the flow rate of the refrigerant flowing in the directions of the arrows AR 7  and AR 8 , the width (cross-sectional area of oil passage) of the shoulder portion  44  of the second refrigerant distribution plate  82  in the directions of the arrows AR 7  and AR 8  is reduced. 
     In this way, by the refrigerant supplied from the inner-diameter-side refrigerant flow path  81 A (first refrigerant flow path  11 ) to the in-core flow path  31  of the first rotor core  30 A and the in-core flow path  31  of the second rotor core  30 B, the magnet  41  can be cooled from inside the rotor core  30 . Also, by the refrigerant supplied from the inner-diameter-side refrigerant flow path  81 A and the outer-diameter-side refrigerant flow path  82 A (first refrigerant flow path  11 ) to the third refrigerant flow path  13  via the second refrigerant flow path  12 , the magnet  41  can be directly cooled. Therefore, the magnet  41  can be appropriately cooled. 
     Hereinbefore, the embodiment of the invention is described. However, the invention is not limited to the embodiment described above and modifications, improvements, and the like can be made as appropriate. 
     For example, the numbers of the first refrigerant distribution plate  81  and the second refrigerant distribution plate  82  constituting the refrigerant distribution plate  80  can be appropriately set. That is, the first refrigerant distribution plate  81  and the second refrigerant distribution plate  82  may be at least one each, and may be two or more. 
     In addition, at least the following matters are described in this specification. In the parentheses, components and the like corresponding to the above-described embodiment are shown, but the invention is not limited thereto. 
     (1) A rotor (rotor  10  of rotary electric machine) of a rotary electric machine which includes a rotor core (rotor core  30 ), a plurality of magnets (magnets  41 ) arranged on an outer peripheral surface of the rotor core, and a rotor shaft (rotor shaft  20 ) rotating integrally with the rotor core, where 
     the rotor shaft is provided with, 
     an in-shaft flow path (in-shaft flow path  21 ) through which a refrigerant is supplied, 
     in the rotor core, 
     a plurality of magnet attaching grooves (magnet attaching grooves  41 A) formed on the outer peripheral surface of the rotor core and in which the magnets are disposed and an in-core flow path (in-core flow path  31 ) extending inside the rotor core in an axial direction of the rotor core are provided and a refrigerant distribution plate (refrigerant distribution plate  80 ) is interposed, and 
     in the refrigerant distribution plate, 
     a first refrigerant distribution plate (first refrigerant distribution plate  81 ) in which an inner-diameter-side refrigerant flow path (inner-diameter-side refrigerant flow path  81 A) extending from the in-shaft flow path toward the in-core flow path as viewed from the axial direction is formed, and 
     a second refrigerant distribution plate (second refrigerant distribution plate  82 ) in which an outer-diameter-side refrigerant flow path (outer-diameter-side refrigerant flow path  82 A) extending from the in-core flow path toward the magnet attaching groove as viewed from the axial direction is formed are provided, and 
     the first refrigerant distribution plate and the second refrigerant distribution plate are stacked in the axial direction. 
     According to (1), since the refrigerant flowing in the in-shaft flow path is supplied to the in-core flow path via the inner-diameter-side refrigerant flow path provided in the first refrigerant distribution plate, the magnet can be cooled from inside the rotor core by the refrigerant flowing through the in-core flow path. In addition, since a part of the refrigerant passing through the inner-diameter-side refrigerant flow path is supplied to the magnet attaching groove via the outer-diameter-side refrigerant flow path provided in the second refrigerant distribution plate, the magnet can be cooled directly by the refrigerant supplied to the magnet attaching groove. 
     (2) The rotor of the rotary electric machine according to (1), where 
     the first refrigerant distribution plate includes a first refrigerant storage portion (first refrigerant storage portion  81 B) provided to overlap with the in-core flow path in a circumferential direction of the rotor core, 
     the inner-diameter-side refrigerant flow path extends in a radial direction of the rotor core from the in-shaft flow path toward the first refrigerant storage portion, 
     the second refrigerant distribution plate includes a second refrigerant storage portion (second refrigerant storage portion  82 B) provided to overlap with the in-core flow path in the circumferential direction of the rotor core, and 
     the outer-diameter-side refrigerant flow path extends in the radial direction from the second refrigerant storage portion toward the magnet attaching groove. 
     According to (2), by the first refrigerant storage portion and the second refrigerant storage portion provided to overlap the in-core flow path in the circumferential direction of the rotor core, the refrigerant flowing from the inner-diameter-side refrigerant flow path to the in-core flow path and the refrigerant flowing from the inner-diameter-side refrigerant flow path to the outer-diameter-side refrigerant flow path can be appropriately separated. 
     (3) The rotor of the rotary electric machine according to (2), where 
     a plurality of the in-core flow paths, the first refrigerant storage portions, and the second refrigerant storage portions are arranged at predetermined intervals in the circumferential direction. 
     According to (3), since a plurality of the in-core flow paths, the first refrigerant storage portions, and the second refrigerant storage portions are arranged at the predetermined intervals in the circumferential direction, the temperature distribution of the magnet in the circumferential direction can be reduced. 
     (4) The rotor of the rotary electric machine according to (3), where 
     the inner-diameter-side refrigerant flow path and the outer-diameter-side refrigerant flow path extend in the radial direction between the magnets adjacent in the circumferential direction. 
     According to (4), since the inner-diameter-side refrigerant flow path and the outer-diameter-side refrigerant flow path extend in the radial direction between the magnets adjacent in the circumferential direction, the refrigerant can be supplied to the magnets adjacent in the circumferential direction through one set of the inner-diameter-side refrigerant flow path and the outer-diameter-side refrigerant flow path. 
     (5) The rotor of the rotary electric machine according to any one of (2) to (4), where 
     a circumferential width of the outer-diameter-side refrigerant flow path becomes wider from the second refrigerant storage portion toward the magnet attaching groove. 
     According to (5), since the circumferential width of the outer-diameter-side refrigerant flow path becomes wider from the second refrigerant storage portion toward the magnet attaching groove, the refrigerant flowing through the outer-diameter-side refrigerant flow path can flow smoothly to the magnet attaching groove. 
     (6) The rotor of the rotary electric machine according to any one of (1) to (5), where 
     an axial width of the first refrigerant distribution plate is set to be wider than an axial width of the second refrigerant distribution plate. 
     According to (6), by making the axial width of the first refrigerant distribution plate wider than the axial width of the second refrigerant distribution plate, the amount of refrigerant flowing from the inner-diameter-side refrigerant flow path to the outer-diameter-side refrigerant flow path can be appropriately adjusted. 
     (7) The rotor of the rotary electric machine according to any one of (1) to (6), where 
     the second refrigerant distribution plate is disposed between a pair of the first refrigerant distribution plates. 
     According to (7), by disposing the second refrigerant distribution plate between the pair of first refrigerant distribution plates, the first refrigerant distribution plates can be made symmetrical about the second refrigerant distribution plate in the axial direction. 
     (8) The rotor of the rotary electric machine according to any one of (1) to (7), where 
     a plurality of magnet attaching grooves (magnet attaching grooves  41 A) in which magnets are arranged are provided on an outer peripheral surface of the refrigerant distribution plate, and 
     the magnet is arranged in the magnet attaching groove. 
     According to (8), by arranging the magnets also on the outer peripheral surface of the refrigerant distribution plate, the amount of magnets in the rotor can be increased, and thus the output of the rotary electric machine can be increased. 
     (9) The rotor of the rotary electric machine according to any one of (1) to (8), where 
     the rotor core includes a first rotor core (first rotor core  30 A) and a second rotor core (second rotor core  30 B), and 
     the first rotor core and the second rotor core are arranged so as to face each other across the refrigerant distribution plate in the axial direction. 
     According to (9), the temperature distribution of the magnet in the axial direction can be suppressed as compared with a case where the refrigerant distribution plate is arranged on one side of the first rotor core and the second rotor core.