JP6196940B2 - Rotor for rotating electrical machines - Google Patents

Description

  The present invention relates to a rotor for a rotating electrical machine capable of suitably cooling the inside.

  Patent Document 1 discloses a configuration and a method for cooling an electric motor rotor. More specifically, the electric motor rotor 10 (hereinafter referred to as “rotor 10”) of Patent Document 1 includes a rotor shaft 30, one or more first oil passages 40, and one or two or more second oil passages. An oil passage 50, one or more third oil passages 60, an oil retaining portion 62, and the rotor core 12 are provided (summary, FIGS. 1 and 2).

  The rotor shaft 30 has a hollow portion 30a serving as a cooling oil path. The first oil passage 40 communicates with the hollow portion 30 a and is formed in the radial direction of the rotor 10. The second oil passage 50 communicates with the first oil passage 40 and is formed on the circumferential surface of the rotor 10 or in the vicinity of the surface along the rotation direction. The third oil passage 60 communicates with the second oil passage 50 and is formed on the circumferential surface of the rotor 10 or in the vicinity of the surface along the axial direction to the vicinity of the end surface of the rotor 10. The oil retaining portion 62 communicates with the third oil passage 60 and is formed in the vicinity of the end surface of the rotor 10. The rotor core 12 communicates with the oil retaining portion 62, is formed on the end surface of the rotor 10, and has a blowout port 64 having a shape whose cross section is narrower than the oil retaining portion 62 (summary, FIGS. 1 and 2). ).

JP 2001-016826 A

  In patent document 1, the inside of the rotor 10 is cooled by cooling oil passing through the hollow portion 30 a of the rotor shaft 30, the first oil passage 40, the second oil passage 50, and the third oil passage 60. All of the cooling oil supplied to the first oil passage 40, the second oil passage 50, and the third oil passage 60 passes through the hollow portion 30a. For this reason, the pressure loss accompanying supply of cooling oil (refrigerant) tends to occur. Moreover, since the directions of the hollow portion 30a, the first oil passage 40, the second oil passage 50, and the third oil passage 60 are different from each other (FIGS. 1 and 2), the refrigerant passage is complicated. Furthermore, in the configuration of Patent Document 1 as described above, there is room for improvement in the cooling efficiency of the rotor 10.

  The present invention has been made in consideration of the above-described problems, and enables at least one of suppression of complication of the refrigerant passage, suppression of increase in pressure loss due to supply of the refrigerant, and improvement of cooling efficiency. It aims at providing the rotor for rotary electric machines.

A rotor for a rotating electrical machine according to the present invention is:
A rotor core having a first core end surface which is an end surface on one side in the axial direction and a second core end surface which is an end surface on the other side in the axial direction;
A permanent magnet fixed to the rotor core;
A refrigerant supply means for supplying a refrigerant in the axial direction with respect to the first core end surface; and an end plate in contact with the first core end surface between the first core end surfaces;
The rotor core is formed with a plurality of holes for guiding the refrigerant from the first core end surface toward the second core end surface, and the plurality of holes are equally spaced or different along a circumferential direction of the rotor core. Formed at intervals,
In the end plate, at least one opening that communicates with a part or all of the plurality of holes and allows the refrigerant supplied from the refrigerant supply means to pass therethrough is formed, and when viewed in the axial direction, The outer peripheral edge of the opening is located radially inward from the outer peripheral edges of the plurality of holes,
On the core facing surface that is the surface facing the first core end surface of the end plate, a recess extending along the circumferential direction is formed at least radially outside the opening ,
The at least one opening of the end plate is disposed to face the plurality of holes of the rotor core .

  ADVANTAGE OF THE INVENTION According to this invention, at least 1 of suppression of complication of a refrigerant path, suppression of the increase in the pressure loss accompanying supply of a refrigerant | coolant, and improvement of cooling efficiency is attained.

  That is, according to the present invention, the rotor core is formed with a plurality of holes for guiding the refrigerant from the first core end surface toward the second core end surface, and the plurality of holes are equally spaced along the circumferential direction of the rotor core. Alternatively, they are formed at different intervals. For this reason, the refrigerant is supplied in the axial direction, passes through the opening of the end plate, and flows through the hole of the rotor core. Therefore, as compared with the case where the refrigerant is supplied into the rotor core only through the inside of the rotor shaft, it is possible to suppress complication of the refrigerant passage and to suppress an increase in pressure loss.

  Further, when viewed in the axial direction, the outer peripheral edge of the opening of the end plate is positioned radially inward from the outer peripheral edge of the hole of the rotor core. For this reason, it is possible to store the refrigerant inside the hole and supply the refrigerant to the other side in the axial direction by suppressing the refrigerant supplied from the opening to the rotor core side from flowing out from the opening. . Therefore, the rotor core can be efficiently cooled by extending the heat exchange time between the refrigerant and the rotor core and expanding the heat exchange region.

  Furthermore, the core facing surface of the end plate is formed with a concave portion extending along the circumferential direction at least radially outside the opening. For this reason, the refrigerant introduced between the rotor core and the end plate via the opening while the rotor core and the end plate are rotating is displaced in the circumferential direction via the recess. This makes it possible to disperse the refrigerant supplied to the plurality of holes of the rotor core in the circumferential direction. As a result, for example, when there is a hole that does not overlap with the opening when viewed in the axial direction (for example, when there is a hole at a position overlapping with the rib formed between the openings of the end plate), Thus, the cooling efficiency can be increased by supplying the refrigerant.

  The rotor core includes a predetermined number of the permanent magnets to form a magnetic pole, and a rib is formed between the openings adjacent to the circumferential direction in the end plate, and the rib is viewed in the axial direction. May be located on the inner peripheral side between the magnetic poles adjacent in the circumferential direction. Thereby, since a refrigerant | coolant can be made to flow more actively with respect to the hole located in the inner peripheral side of a permanent magnet, it becomes possible to cool a permanent magnet effectively.

  A discharge path that communicates with the recess and extends outward in the radial direction and opens to the outer periphery is formed on the core facing surface of the end plate, and the discharge path is at least partially when viewed from the axial direction. May overlap the permanent magnet. Thereby, it becomes possible to make a refrigerant | coolant and a permanent magnet contact or approach in the middle of discharging | emitting a refrigerant | coolant to an outer peripheral side via a discharge path. For this reason, a permanent magnet can be cooled effectively.

  ADVANTAGE OF THE INVENTION According to this invention, at least 1 of suppression of complication of a refrigerant path, suppression of the increase in the pressure loss accompanying supply of a refrigerant | coolant, and improvement of cooling efficiency is attained.

It is a perspective view of a motor containing a rotor concerning one embodiment of the present invention. It is a front view of a rotor core. It is an expanded sectional perspective view which expands and shows a part of section of the rotor. It is an expanded sectional side view which expands and shows a part of cross section of the said motor. It is a rear view which expands and shows a part of front side end plate. It is an enlarged front view which expands and abbreviates and shows a part of the rotor. It is a perspective view of the motor containing the rotor which concerns on the 1st modification of this invention. It is the elements on larger scale of the motor containing the rotor which concerns on the 2nd modification of this invention.

A. Embodiment A1. Configuration [A1-1. overall structure]
FIG. 1 is a perspective view of a motor 10 including a rotor 14 according to an embodiment of the present invention. The broken line in FIG. 1 shows the component seen through. In addition to the rotor 14, the motor 10 includes a refrigerant supply unit 12 and a stator 16 (FIG. 4).

  The motor 10 is used as, for example, a driving source for generating a driving force of a vehicle (not shown). The motor 10 is a three-phase AC brushless type, and can generate the driving force of the vehicle based on electric power supplied from a battery (not shown) via an inverter (not shown).

[A1-2. Refrigerant supply unit 12]
The refrigerant supply unit 12 (refrigerant supply means) supplies (injects or discharges) a refrigerant 300 (for example, cooling oil) to the rotor 14, and includes a pump, a nozzle, and the like (not shown). The pump may be either electric or mechanical. In FIG. 1 etc., the refrigerant | coolant supply part 12 is drawn simply. Moreover, in FIG. 1 etc., the flow of the refrigerant | coolant 300 is shown as the arrow.

[A1-3. Rotor 14]
(A1-3-1. Overview of rotor 14)
As shown in FIG. 1, the rotor 14 includes a rotor shaft 20, a rotor core 22, a front side end plate 24 (hereinafter also referred to as “first end plate 24” or “end plate 24”), and a back side end plate. 26 (hereinafter also referred to as “second end plate 26” or “end plate 26”). The rotor core 22 may be configured without including the permanent magnet 52 as in a reluctance motor type rotor.

(A1-3-2. Rotor shaft 20)
The rotor shaft 20 is inserted into the shaft insertion hole 30 (FIG. 2) of the rotor core 22 and fixed to the rotor core 22 (see FIGS. 1 and 2). The rotor shaft 20 has a hollow shape and allows the refrigerant 300 to pass therethrough.

(A1-3-3. Rotor core 22)
FIG. 2 is a front view of the rotor core 22. FIG. 3 is an enlarged cross-sectional perspective view showing a part of the cross section of the rotor 14 in an enlarged manner. FIG. 4 is an enlarged cross-sectional side view showing a part of the cross section of the motor 10 in an enlarged manner. In FIG. 4, the stator 16 is indicated by a two-dot chain line.

  The rotor core 22 is formed by laminating a plurality of annular electromagnetic steel plates (for example, silicon steel plates) having substantially the same shape in the axial directions X1 and X2, and is disposed to face the stator core 200 (FIG. 4) of the stator 16. The rotor core 22 includes a shaft insertion hole 30, a magnetic pole portion 32, an inner circumferential side annular portion 34 (first annular portion), a plurality of ribs 36, an outer circumferential side annular portion 38 (second annular portion), and a through hole. 40.

  The rotor shaft 20 is press-fitted into the shaft insertion hole 30 to fix the rotor shaft 20 and the rotor core 22.

  The magnetic pole portion 32 forms a magnetic pole on the rotor 14 side, and is arranged at a predetermined interval (here, equal intervals) in the circumferential direction C1 and C2 of the rotor 14. Each magnetic pole portion 32 includes three magnet insertion holes 50a, 50b, 50c (hereinafter also referred to as “insertion holes 50a, 50b, 50c”) and a permanent magnet 52 inserted into the insertion holes 50a, 50b, 50c. . The permanent magnets 52 are magnetized in the radial directions R1 and R2 and arranged so that the magnetization directions are alternately different in the circumferential directions C1 and C2.

  As shown in FIG. 2 and the like, each rib 36 extends toward the outer peripheral side (R2 direction). As can be understood from FIGS. 3 and 4, the rib 36 has an end surface 62 (on the right side in FIG. 4) from the end surface 60 (on the left side in FIG. 4) on one end side of the rotor core 22 in the axial directions X <b> 1 and X <b> 2. ). Hereinafter, the end surface 60 is also referred to as a “first core end surface 60” or a “first end surface 60”. The end face 62 is also referred to as “second core end face 62” or “second end face 62”.

  The through hole 40 is formed by the inner circumferential side annular portion 34, the adjacent rib 36 and the outer circumferential side annular portion 38. The through hole 40 penetrates from the first core end surface 60 to the second core end surface 62 in the axial directions X1 and X2. The through hole 40 functions as a thinned portion and also functions as a refrigerant passage.

(A1-3-4. Front side end plate 24)
(A1-3-4-1. Overview of the front end plate 24)
FIG. 5 is a rear view showing a part of the front end plate 24 in an enlarged manner. FIG. 6 is an enlarged front view showing a part of the rotor 14 in an enlarged and omitted manner. As shown in FIGS. 1, 3, and 4, the end plate 24 is an annular plate (core cover or side) disposed so as to be in contact with the first core end surface 60 between the refrigerant supply unit 12 and the first core end surface 60. Cover). The end plate 24 is made of a non-magnetic metal based on an annular shape, and forms a part of the passage 302 (FIG. 4) of the refrigerant 300 supplied to the rotor core 22.

  As shown in FIG. 1 and the like, when viewed in the axial direction X2, the end plate 24 includes an inner peripheral side annular portion 70 and a plurality of ribs 72 (hereinafter referred to as “first end plate rib 72” or “end plate rib 72”). Also, an outer peripheral side annular portion 74 and an opening 76 are provided. When viewed from the refrigerant supply unit 12 toward the rotor core 22, the end plate 24 has a groove portion 78 (hereinafter referred to as a “first groove portion”) in addition to the inner circumferential side annular portion 70, the rib 72, the outer circumferential side annular portion 74, and the opening 76. 78 ”or“ front side groove 78 ”and a discharge path 80 (hereinafter also referred to as“ first discharge path 80 ”or“ front side discharge path 80 ”) (see FIG. 5 and the like). In other words, the first groove portion 78 and the first discharge path 80 are formed on the surface 82 of the first end plate 24 facing the rotor core 22 (hereinafter also referred to as “core facing surface 82”).

(A1-3-4-2. Opening 76)
As shown in FIG. 3 and the like, the opening 76 is formed by an inner peripheral side annular portion 70, adjacent first end plate ribs 72 and an outer peripheral side annular portion 74.

  As shown in FIGS. 3, 4, etc., the inner peripheral side annular portion 70 of the first end plate 24 is in contact with the inner peripheral side annular portion 34 of the rotor core 22. Further, the outer peripheral side annular portion 74 of the first end plate 24 is in contact with the outer peripheral side annular portion 38 of the rotor core 22 except for the position of the first discharge path 80. Thereby, a part of the passage 302 of the refrigerant 300 is formed between the first core end surface 60 and the first end plate 24.

  As shown in FIGS. 1, 3, 4, etc., the end plate rib 72 and the opening 76 of the first end plate 24 are disposed to face the rib 36 and the through hole 40 of the rotor core 22. Thereby, the refrigerant 300 introduced through the opening 76 is easily guided to the through hole 40. The end plate rib 72 (particularly, the center in the circumferential directions C1 and C2) is disposed at a position (phase) where the permanent magnet 52 does not exist in the radial directions R1 and R2.

  As shown in FIGS. 3 and 4, when viewed in the axial directions X <b> 1 and X <b> 2, the outer peripheral edge of the opening 76 is located radially inward (R2 direction) with respect to the outer peripheral edge of the through hole 40 of the rotor core 22. . For example, in FIG. 4, the upper end of the opening 76 is below the upper end of the through hole 40. Thereby, in the state where the rotor 14 is rotated and the centrifugal force is applied to the refrigerant 300, the refrigerant pool 304 in which the refrigerant 300 is accumulated is formed. Thereby, the refrigerant 300 is difficult to leak from the opening 76.

(A1-3-4-3. Front side groove portion 78)
As shown in FIG. 5 etc., the 1st groove part 78 is formed in the circumferential directions C1 and C2 corresponding to the position of the opening part 76. As shown in FIG. The first groove portion 78 of the present embodiment has an annular shape, and is formed in the first end plate 24 over the entire circumferential direction C1 and C2. The first groove portion 78 is formed around the opening 76 in the outer peripheral side annular portion 74 and inside the first end plate rib 72. In other words, the first end plate rib 72 is thin as the first groove 78 is formed.

(A1-3-4-4. Front side discharge path 80)
The first discharge path 80 is a path for discharging the refrigerant 300 from the inside of the rotor 14 to the outside. As shown in FIG. 1, a plurality of first discharge paths 80 are formed at predetermined intervals (here, equal intervals) in the circumferential directions C1 and C2.

  Moreover, as shown in FIGS. 1 and 3 to 6, the first discharge path 80 extends from the first groove portion 78 along the radial direction R <b> 2. As shown in FIGS. 1 and 6, the first discharge path 80 is disposed so as to overlap the permanent magnet 52 when viewed in the axial direction X <b> 2. In the present embodiment, the permanent magnet 52 is exposed to the first end plate 24 in the axial directions X1 and X2. For this reason, when the refrigerant 300 is discharged to the outside of the rotor 14 via the first discharge path 80, the refrigerant 300 comes into contact with the permanent magnet 52. In order to easily guide the refrigerant 300 to the first discharge path 80, the first discharge path 80 is disposed in the middle of the adjacent first end plate ribs 72 in the circumferential directions C1 and C2.

  Further, as shown in FIG. 4, the first discharge path 80 is bent in the axial direction X <b> 1 in the vicinity of the outer peripheral surface of the rotor 14. Thus, the refrigerant 300 ejected from the first discharge path 80 is supplied to the coil 202 wound around the stator core 200, and the coil 202 can be cooled by the refrigerant 300. In addition, the refrigerant 300 can be prevented from entering between the rotor core 22 and the stator core 200. As a result, it is possible to suppress an increase in friction due to the refrigerant 300 entering between the rotor core 22 and the stator core 200 and an accompanying increase in the temperature of the refrigerant 300.

(A1-3-5. Back end plate 26)
(A1-3-5-1. Overview of the back end plate 26)
As shown in FIGS. 3 and 4, the rear side end plate 26 is an annular plate (core cover or side cover) disposed so as to be in contact with the second core end surface 62. The second end plate 26 is made of a non-magnetic metal based on an annular shape, and forms a part of the passage 302 of the refrigerant 300 supplied to the rotor core 22.

  As shown in FIGS. 3, 4, 6, and the like, the second end plate 26 includes an inner circumferential side annular portion 90, an outer circumferential side annular portion 94, and a groove portion 96 (hereinafter referred to as “second groove portion 96” or “back side groove”. And a discharge path 98 (hereinafter also referred to as “second discharge path 98” or “back side discharge path 98”). The rear side end plate 26 does not include a portion corresponding to the opening 76 of the front side end plate 24 (through hole that penetrates the end plate 26 in the axial directions X1 and X2).

(A1-3-5-2. Back side groove 96)
As shown in FIGS. 3 and 6, the second groove portion 96 is formed in the circumferential directions C <b> 1 and C <b> 2 corresponding to the position of the through hole 40 of the rotor core 22. As shown in FIG. 6, the second groove portion 96 of the present embodiment is an annular shape surrounded by the inner circumferential side annular portion 90 and the outer circumferential side annular portion 94, and the second groove portion 96 extends across the entire circumferential directions C <b> 1 and C <b> 2. Formed on the end plate 26. As shown in FIGS. 3 and 4, the second groove 96 is longer in the radial direction outer side (R2 direction) than the through hole 40 of the rotor core 22.

(A1-3-5-3. Back side discharge path 98)
The second discharge path 98 is a path for discharging the refrigerant 300 from the inside of the rotor 14 to the outside. When viewed in the axial directions X1 and X2, a plurality of back side discharge passages 98 are formed at positions overlapping the front side discharge passages 80 (that is, predetermined intervals (here, equal intervals) in the circumferential directions C1 and C2). .

  Similarly to the first discharge path 80, the second discharge path 98 extends from the second groove portion 96 along the radial direction R2 and overlaps the permanent magnet 52 when viewed in the axial directions X1 and X2. Be placed. In the present embodiment, the permanent magnet 52 is exposed to the second end plate 26 in the axial directions X1 and X2. For this reason, when the refrigerant 300 is discharged to the outside of the rotor 14 through the second discharge path 98, the refrigerant 300 comes into contact with the permanent magnet 52.

  Further, as shown in FIG. 4, the second discharge path 98 is bent in the axial direction X <b> 2 near the outer peripheral surface of the rotor 14. Thereby, it becomes possible to exhibit the same operation and effect as the first discharge path 80.

A2. Next, the flow of the refrigerant 300 in the rotor 14 will be described.

  If the refrigerant 300 from the refrigerant supply unit 12 is supplied to the opening 76 while the rotor 14 is rotating, the refrigerant 300 enters between the front end plate 24 and the first core end surface 60. . A part of the refrigerant 300 flows into the through hole 40 of the rotor core 22.

  The refrigerant 300 that has flowed into the through hole 40 moves in the circumferential directions C1 and C2 via the first groove 78 or the second groove 96. Alternatively, the refrigerant 300 moves in the radial direction R <b> 2 via the first discharge path 80 or the second discharge path 98 and is discharged out of the rotor 14. Further, the refrigerant 300 that cannot enter the grooves 78, 96 or the discharge paths 80, 98 because the dimensions of the grooves 78, 96 and the discharge paths 80, 98 are limited remains in the refrigerant pool 304 of the through hole 40. Note that the refrigerant 300 that has reached another through-hole 40 via the grooves 78 and 96 may form a refrigerant pool 304 in the other through-hole 40.

  As described above, in the present embodiment, the refrigerant 300 supplied through the opening 76 moves through the rotor 14 and is then discharged from the rotor 14 through the discharge paths 80 and 98. However, depending on the rotational speed of the rotor 14, the supply amount of the refrigerant 300, etc., the refrigerant 300 that has entered from the opening 76 may leak out of the rotor 14 through the opening 76.

A3. Operation and Effect of the Present Embodiment According to the present embodiment as described above, at least one of suppression of complication of the passage 302 of the refrigerant 300, suppression of increase in pressure loss due to supply of the refrigerant 300, and improvement of cooling efficiency are provided. It becomes possible.

  That is, according to the present embodiment, the rotor core 22 is formed with a plurality of through holes 40 (holes) for guiding the refrigerant 300 from the first core end surface 60 toward the second core end surface 62. Are formed at equal intervals along the circumferential directions C1 and C2 (FIGS. 1 to 4, etc.). For this reason, the refrigerant 300 is supplied in the axial direction X <b> 2, passes through the opening 76 of the front end plate 24, and flows through the through hole 40 of the rotor core 22. Therefore, as compared with the case where the refrigerant 300 is supplied into the rotor core 22 only through the inside of the rotor shaft 20, it is possible to suppress complication of the passage 302 and suppress increase in pressure loss.

  Further, when viewed in the axial directions X1 and X2, the outer peripheral edge of the opening 76 of the first end plate 24 is positioned radially inward (R1 direction) with respect to the outer peripheral edge of the through hole 40 of the rotor core 22 (FIG. 4). etc). For this reason, the refrigerant 300 supplied from the opening 76 to the rotor core 22 side is prevented from flowing out of the opening 76, thereby storing the refrigerant 300 inside the through hole 40 and the other side in the axial direction (X2 direction). ) Can be supplied with the refrigerant 300. Therefore, the rotor core 22 can be efficiently cooled by extending the heat exchange time between the refrigerant 300 and the rotor core 22 and expanding the heat exchange region.

  Furthermore, a first groove portion 78 (concave portion) extending along the circumferential directions C1 and C2 is formed on the core facing surface 82 of the first end plate 24 at least radially outward (R2 direction) from the opening 76. (FIG. 5 etc.). For this reason, the refrigerant 300 introduced between the rotor core 22 and the first end plate 24 through the opening 76 in a state where the rotor core 22 and the first end plate 24 are rotating is circular via the first groove portion 78. It will be displaced in the circumferential directions C1 and C2. Thereby, the refrigerant 300 supplied to the plurality of through holes 40 of the rotor core 22 can be dispersed in the circumferential directions C1 and C2. As a result, for example, when there is a through hole 40 that does not overlap the opening 76 when viewed in the axial directions X1 and X2 (for example, the first end plate rib 72 formed between the openings 76 of the first end plate 24). Even when the through hole 40 is located at a position overlapping with the through hole 40, the cooling efficiency can be increased by supplying the coolant 300 to the through hole 40.

  In the present embodiment, the rotor core 22 includes a predetermined number of permanent magnets 52 to form a magnetic pole (magnetic pole portion 32) (FIG. 2 and the like). Further, in the first end plate 24, first end plate ribs 72 are formed between the openings 76 adjacent to the circumferential directions C1 and C2, and the ribs 72 are circular when viewed in the axial directions X1 and X2. It is located on the inner peripheral side between the magnetic poles (magnetic pole portion 32) adjacent to the circumferential directions C1 and C2 (FIG. 6 and the like). Thereby, since it is possible to allow the refrigerant 300 to more actively flow into the through hole 40 (hole) located on the inner peripheral side of the permanent magnet 52, the permanent magnet 52 can be effectively cooled. It becomes possible.

  In the present embodiment, the first discharge path 80 that communicates with the first groove 78 (concave portion) and extends radially outward (R2 direction) and opens to the outer periphery of the core facing surface 82 of the first end plate 24. Is formed (FIG. 1, FIG. 4, etc.). Further, when viewed in the axial directions X <b> 1 and X <b> 2, at least a portion of the first discharge path 80 overlaps the permanent magnet 52. Accordingly, the refrigerant 300 and the permanent magnet 52 can be brought into contact with or approached in the middle of discharging the refrigerant 300 to the outer peripheral side via the first discharge path 80. For this reason, the permanent magnet 52 can be cooled effectively.

B. Modifications It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted based on the description of the present specification. For example, the following configuration can be adopted.

B1. Application Target In the above embodiment, the motor 10 is described as an example mounted on a vehicle. However, the present invention is not limited to this, and the present invention can be applied to other applications using the motor 10. For example, the motor 10 can be used for devices such as industrial machines and home appliances.

B2. Refrigerant supply unit 12 (refrigerant supply means)
In the above embodiment, the cooling oil is used as the refrigerant 300. However, for example, from the viewpoint of the cooling function, a cooling fluid (for example, water) other than the cooling oil may be used.

B3. Motor 10
[B3-1. General motor 10]
In the above embodiment, the motor 10 is a three-phase AC method, but may be another AC method or a DC method from the viewpoint of cooling by the refrigerant 300 or miniaturization of the motor 10, for example. In the above embodiment, the motor 10 is a brushless type, but may be a brush type.

  In the above embodiment, the refrigerant 300 is supplied into the rotor core 22 via the first end plate 24 (FIG. 1). In addition to this, for example, as in Patent Document 1, it is possible to supply the refrigerant 300 into the rotor core 22 through the hollow portion of the rotor shaft 20.

[B3-2. Rotor core 22]
In the above embodiment, the shape of the rotor core 22 is shown in FIG. However, for example, from the viewpoint of cooling the rotor core 22, the present invention is not limited to this. For example, the shape of the rotor core 22 shown in FIG. 1 of JP-A-11-098739 or FIG. 1 of JP-A-2004-194419 can be used.

  In the above embodiment, the through hole 40 was parallel to the rotation axis Ax (FIGS. 3 and 4). However, for example, if attention is paid to the point that the through hole 40 guides the refrigerant 300 from the first core end surface 60 toward the second core end surface 62, the through hole 40 may not be parallel to the rotation axis Ax. .

  In the above embodiment, the through-hole 40 has the same radial direction R1, R2 position (FIG. 2 etc.). However, for example, if attention is paid to the function of the first groove portion 78 in the front end plate 24 (movement of the refrigerant 300 in the circumferential directions C1 and C2), the through-hole 40 has different positions in the radial directions R1 and R2. You may let them.

  In the above embodiment, each of the through holes 40 is a through hole that reaches from the first core end surface 60 to the second core end surface 62 (FIGS. 3, 4, etc.). However, for example, when focusing on the configuration of the first end plate 24, the hole 40 may not reach the second core end surface 62.

[B3-3. Front side end plate 24 and back side end plate 26]
(B3-3-1. End plates 24, 26 as a whole)
In the said embodiment, the end plates 24 and 26 were made into the annular | circular shape (refer FIG. 1 etc.). However, for example, when attention is paid to the functions of the grooves 78 and 96, the end plates 24 and 26 may be formed in a quadrangular ring shape. Alternatively, the end plates 24 and 26 may be arcuate shapes that are not annular (in other words, the end plates 24 and 26 may be formed only in a part of the circumferential directions C1 and C2).

  In the above embodiment, both the front side end plate 24 and the back side end plate 26 are used (FIGS. 1, 3, 4, etc.). However, for example, if attention is paid to the configuration of the front end plate 24, a configuration in which the back end plate 26 is not provided is also possible.

(B3-3-2. Opening 76)
In the above embodiment, the shape, number, arrangement, and the like of the opening 76 are shown in FIG. However, for example, from the viewpoint of cooling the rotor core 22, the present invention is not limited to this. For example, the shape of the opening 76 can be changed. Moreover, in the said embodiment, although the number of the opening parts 76 was four (FIG. 1), it is good also as 1-3 or 5 or more.

  FIG. 7 is a perspective view of a motor 10A including a rotor 14a according to a first modification of the present invention. In the motor 10A, the shape of the front end plate 24a is different from the end plate 24 of the above embodiment. Specifically, in the end plate 24a according to the first modified example, the length of the opening 76a in the circumferential directions C1 and C2 is shorter than the end plate 24 of the above embodiment. Accordingly, the number of openings 76a is larger than that in the above embodiment, and the length of the first end plate ribs 72a in the circumferential directions C1 and C2 is increased.

  According to the rotor 14a according to the first modified example, the length of the first end plate ribs 72a in the circumferential directions C1 and C2 is increased, and thus the rotor core 22 and the first end plate 24a are rotated during the rotation of the rotor core 22 and the first end plate 24a. The refrigerant 300 is less likely to leak from between the end plates 24a.

  FIG. 8 is a partially enlarged view of a motor 10B including a rotor 14b according to a second modification of the present invention. In the motor 10B, the shape and position of the front end plate 24b and the shape of the permanent magnet 52 are different from those of the above-described embodiment and the first modification. Specifically, in the first end plate 24b according to the second modification, an opening 76b (second opening) corresponding to the position of the permanent magnet 52 is provided in addition to the opening 76 of the above embodiment. In addition, a through hole 100 (hereinafter also referred to as “magnet through hole 100”) is formed in the permanent magnet 52. In this case, by supplying the refrigerant 300 from the refrigerant supply unit 12 to the second opening 76 b in addition to the opening 76, the refrigerant 300 is directly supplied to the permanent magnet 52, and the magnet through hole 100 is further provided. The refrigerant 300 can be passed. Thereby, the cooling efficiency of the permanent magnet 52 can be improved.

  A groove similar to the groove 78 is provided at a position corresponding to the second opening 76b to allow the refrigerant 300 to move in the circumferential directions C1 and C2 between the rotor core 22 and the first end plate 24b. May be.

(B3-3-3. Front side groove part 78 and back side groove part 96 (concave part))
In the above embodiment, the front side groove portion 78 is formed across the inner peripheral side annular portion 70, the first end plate rib 72, and the outer peripheral side annular portion 74 of the first end plate 24 (FIG. 5 and the like). However, for example, from the viewpoint of moving the refrigerant 300 introduced between the first end plate 24 and the rotor core 22 through the opening 76 in the circumferential directions C <b> 1 and C <b> 2, the inner circumferential annular portion 70 and the rib 72. It is also possible to form the front side groove portion 78 for only one or two of the outer peripheral side annular portions 74. The same applies to the rear groove portion 96.

(B3-3-4. Front side discharge path 80 and back side discharge path 98)
In the above embodiment, the first discharge path 80 is bent in the axial direction X1 and the second discharge path 98 is bent in the axial direction X2 around the outer peripheral surface of the rotor 14 (FIG. 4). However, for example, if attention is paid to the function of the opening 76 or the like, it is possible not to perform such bending.

  In the above embodiment, the discharge paths 80 and 98 face only the one in the insertion hole 50b among the three permanent magnets 52 included in the magnetic pole part 32 (FIG. 1 and the like). However, for example, from the viewpoint of cooling the permanent magnets 52, the discharge paths 80 and 98 are branched in the circumferential directions C1 and C2 before the insertion hole 50b, and the refrigerant 300 is supplied to each of the three permanent magnets 52. Also good.

  In the said embodiment, the discharge paths 80 and 98 were arrange | positioned corresponding to only the specific magnetic pole part 32 among the some magnetic pole parts 32 (refer FIG. 1 etc.). However, the discharge paths 80 and 98 may be arranged corresponding to all the magnetic pole portions 32.

DESCRIPTION OF SYMBOLS 10 ... Motor (rotary electric machine) 12 ... Refrigerant supply part (refrigerant supply means)
14, 14a, 14b ... rotor 22 ... rotor core 24, 24a, 24b ... front side end plate (end plate)
32 ... magnetic pole part 40 ... through hole (hole)
52 ... Permanent magnet 60 ... First core end surface 62 ... Second core end surface 72, 72a ... First end plate rib (rib)
76, 76a, 76b ... opening 78 ... first groove (recess)
80 ... 1st discharge path 82 ... Core opposing surface 300 ... Refrigerant C1, C2 ... Circumferential direction X1, X2 ... Axial direction

Claims (3)

A rotor core having a first core end surface which is an end surface on one side in the axial direction and a second core end surface which is an end surface on the other side in the axial direction;
A permanent magnet fixed to the rotor core;
A rotor for a rotating electrical machine, comprising: a refrigerant supply means for supplying a refrigerant in the axial direction with respect to the first core end surface; and an end plate in contact with the first core end surface between the first core end surfaces,
The rotor core is formed with a plurality of holes for guiding the refrigerant from the first core end surface toward the second core end surface, and the plurality of holes are equally spaced or different along a circumferential direction of the rotor core. Formed at intervals,
In the end plate, at least one opening that communicates with a part or all of the plurality of holes and allows the refrigerant supplied from the refrigerant supply means to pass therethrough is formed, and when viewed in the axial direction, The outer peripheral edge of the opening is located radially inward from the outer peripheral edges of the plurality of holes,
On the core facing surface that is the surface facing the first core end surface of the end plate, a recess extending along the circumferential direction is formed at least radially outside the opening ,
The rotor, wherein the at least one opening of the end plate is disposed to face the plurality of holes of the rotor core . The rotor according to claim 1,
The rotor core has a magnetic pole constituted by a predetermined number of the permanent magnets,
In the end plate, a rib is formed between the openings adjacent in the circumferential direction,
The said rotor is located in the inner peripheral side between the said magnetic poles adjacent to the said circumferential direction when seeing in the said axial direction. The rotor characterized by the above-mentioned. The rotor according to claim 1 or 2,
The core-facing surface of the end plate is formed with a discharge path that communicates with the recess and extends radially outward and opens to the outer periphery.
The rotor, wherein when viewed from the axial direction, at least a part of the discharge path overlaps the permanent magnet.

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