Rotor module with cooling structure

Abstract

The present invention relates to a rotor, and more specifically, to a rotor with improved cooling efficiency. A rotor module having a cooling structure according to the present invention directly provides the rotor with a cooling structure including a cooling channel penetrating the interior of the rotor core, thereby performing more direct rotor cooling and thereby having the effect of improving motor performance.

Description

Technology Field

[0001] The present invention relates to a rotor, and more specifically, to a rotor with improved cooling efficiency. Background Technology

[0003] The heat sources of an electric vehicle drive motor are the coil through which current flows and the electrical steel core through which magnetic flux flows. When the motor operates, the temperature of these components rises, and if the temperature becomes excessively high, motor malfunction occurs. To prevent this, it is important to cool the heat sources of the motor. Motor cooling methods include oil cooling, which involves directly spraying oil onto the heat sources, and water cooling, which involves indirectly cooling the heat sources by flowing coolant through the housing channels.

[0004] Among these, the oil cooling method is performed through cooling pipes that spray cooling oil to cool the heat of the stator, which is the main heating element, and the surrounding parts. At this time, the cooling oil sprayed through the cooling pipes cools the motor, which is the heating element, and the hot oil with transferred heat is stored at the bottom of the motor. The oil stored at the bottom of the motor is guided to the reduction gear through the internal housing passage connecting the motor and the reduction gear, and subsequently, the oil is used for lubricating the reduction gear through churning. In addition, the oil stored in the reduction gear housing is moved to an external heat exchanger via a pump, and the structure adopts a system in which the oil, cooled by heat exchange with cooling water, is circulated again for motor cooling.

[0005] When using this conventional drive motor oil cooling method, separate cooling pipes were required, which increased the number of parts and presented the problem of difficulty in cooling the stator core core and rotor core. Additionally, in the case of the rotor core, direct cooling was difficult when oil was sprayed externally because it was obscured by plates and the stator core / coils. Prior art literature

[0007] Republic of Korea Published Patent 10-2022-0096306 "Cooling oil injection structure" Dec. 31, 2020 The problem to be solved

[0008] The present invention has been devised to solve the above-mentioned problems, and the objective of the present invention is to provide a rotor module having a cooling structure that can perform more direct rotor cooling and thereby improve motor performance by directly equipping the rotor with a cooling structure including a cooling channel penetrating the interior of the rotor core.

[0009] More specifically, the invention provides a rotor module having a cooling structure that improves cooling performance by forming a cooling channel in the rotor core so that the core and the cooling fluid come into direct contact, and facilitates cooling of the outer magnet, which is relatively difficult to cool, by positioning the channel between the outer magnet and the inner magnet.

[0010] In addition, the invention provides a rotor module having a cooling structure that can resolve the imbalance of cooling oil within the core and prevent NVH problems by installing an oil outlet hole in a plate located at the end of the core and installing the position radially inward relative to the core flow path. means of solving the problem

[0012] To solve the problem described above, a rotor module having a cooling structure according to an embodiment of the present invention comprises a rotor core formed in a hollow cylindrical shape, a cooling fluid flow path that is fitted and fixed to the center of the rotor core and filled with a cooling fluid, and a rotor shaft that rotates around the central axis of the rotor core, wherein the rotor core comprises a cooling path portion having one end communicating with the cooling fluid flow path and the other end communicating with the outside of the rotor core, and the cooling path portion comprises a first path formed through the side of the rotor shaft and dispersing fluid from the cooling fluid flow path toward one end of the rotor core, a second path formed through the rotor core in the axial direction and communicating with the first path, a fourth path formed in the radial direction with one end communicating with the other end of the second path, a first fluid injection hole formed through the other end of the fourth path, and one end of which is connected to the one end of the second path and It includes a sixth fluid channel formed radially and connected to the other end of the sixth fluid channel, and a fourth fluid injection hole formed through the other end of the sixth fluid channel, wherein the distance between the first fluid injection hole and the rotation axis of the rotor core is shorter than the distance between the second fluid channel and the rotation axis, and a portion of the fluid flowing through the cooling channel passes through the second fluid channel from one end to the other end in the axial direction and is injected toward the other end of the rotor core through the first fluid injection hole, and another portion of the fluid flowing through the cooling channel passes through the second fluid channel from the other end to one end in the axial direction and is injected toward the one end of the rotor core through the fourth fluid injection hole, and the rotor core is a flat plate having a second insertion hole formed in the center into which the rotor shaft is fitted, and includes a second plate that contacts one surface with the other end surface of the rotor core, and the second plate includes a protrusion formed axially along the circumference of the second insertion hole on the other surface.The above-mentioned protrusion is formed to protrude so as to partially overlap with the area where the first fluid injection hole is formed, and a groove is formed in the area overlapping with the first fluid injection hole to guide the cooling fluid injected through the first fluid injection hole to the radially outer side of the rotor core.

[0013] In addition, the cooling passage section is characterized by including a first passage formed through the side of the rotor shaft to disperse fluid from the cooling fluid flow passage to one end of the rotor core, and a second passage formed through the rotor core in the axial direction and communicating with the first passage.

[0014] Additionally, the cooling channel section includes a third channel formed radially, with one end communicating with a first channel and the other end communicating with a second channel, and the rotor core includes a first plate which is a flat plate having a first insertion hole formed in the center into which a rotor shaft is fitted, one side of the first plate contacts the end surface of the rotor core, and the third channel is formed in a groove shape on one side of the first plate.

[0015] Additionally, the cooling channel section includes a fourth channel formed radially with one end communicating with the second channel and a first fluid injection hole formed through the other end of the fourth channel, and the rotor core includes a second plate which is a flat plate having a second insertion hole formed in the center into which a rotor shaft is fitted, one side of the second plate contacts the other end surface of the rotor core, the fourth channel is formed in a groove shape on one side of the second plate, and the first fluid injection hole is formed by penetrating the second plate axially.

[0016] In addition, the distance between the first fluid injection hole and the rotation axis of the rotor core is shorter than the distance between the second fluid path and the rotation axis.

[0017] In addition, the length of the fourth Euro is characterized by being larger than the sum of the diameter of the first Euro and the diameter of the first fluid injection hole.

[0018] In addition, the cooling channel portion is connected to the third channel and includes a fifth channel extending from one end of the third channel and a second fluid injection hole formed through the end of the fifth channel, wherein the fifth channel is formed in a groove shape on one surface of the first plate and the second fluid injection hole is formed by penetrating the first plate in the axial direction.

[0019] In addition, the distance between the second fluid injection hole and the rotation axis of the rotor core is shorter than the distance between the second fluid path and the rotation axis.

[0020] In addition, it is characterized by including a sixth fluid path formed in a groove shape in the first plate, with one end communicating with the second fluid path, and a fourth fluid injection hole formed through the first plate at the other end of the sixth fluid path, and a seventh fluid path formed through the side of the rotor shaft to disperse fluid from the cooling fluid flow path to the other end of the rotor core, and an eighth fluid path formed in a groove shape in the second plate, with one end communicating with the seventh fluid path and the other end communicating with the second fluid path, and formed in a radial direction.

[0021] Additionally, the invention further includes a supply pipe for supplying cooling fluid inside a cooling fluid flow path, and the rotor shaft comprises a first part in which a rotor core is fitted on its side and a cooling fluid flow path is formed, with one side of the cooling fluid flow path being open, and a second part in which a press-fit part is formed at one end and the press-fit part is fitted into one side of the first part and one end of the supply pipe is fitted into the second part, wherein the supply pipe is fitted into the second part such that one end is positioned closer to the end of the press-fit part than to the axial center of the cooling fluid flow path. Effects of the invention

[0023] The rotor module having the cooling structure of the present invention according to the above configuration has the effect of performing more direct rotor cooling and thereby improving the performance of the motor by directly providing the rotor with a cooling structure including a cooling channel penetrating the interior of the rotor core.

[0024] More specifically, by forming a cooling channel in the rotor core so that the core and the cooling fluid come into direct contact, the cooling performance is improved, and by positioning the channel between the outer magnet and the inner magnet, the cooling of the outer magnet, which is relatively difficult to cool, can be performed more easily.

[0025] In addition, by installing an oil outlet hole in a plate located at the end of the core and positioning it radially inward relative to the core flow path, it is possible to resolve the imbalance of the cooling oil within the core and prevent NVH problems. Brief explanation of the drawing

[0027] FIG. 1 is a perspective view showing an axial cross-section of a rotor module having a cooling structure of the present invention. FIG. 2 is an axial cross-sectional view of a rotor module having a cooling structure of the present invention. FIG. 3 is a radial cross-sectional view of the rotor core of the present invention. FIGS. 4 and 5 are partial cross-sectional views of a rotor module having a cooling structure illustrating the fourth flow path of the present invention. FIG. 6 is a plan view of the first plate of the present invention. FIG. 7 is a plan view of the second plate of the present invention. FIG. 8 is a partial perspective view of a rotor module having a cooling structure showing a protrusion of the present invention. FIG. 9 is an axial cross-sectional view of a rotor module having a cooling structure according to a first embodiment of the cooling channel portion of the present invention. FIG. 10 is a plan view of a first plate according to a first embodiment of the cooling channel portion of the present invention. FIG. 11 is a plan view of a second plate according to a second embodiment of the cooling channel portion of the present invention. FIG. 12 is a plan view of a first plate according to a third embodiment of the cooling channel portion of the present invention. FIG. 13 is an axial cross-sectional view of a rotor module having a cooling structure according to a third embodiment of the cooling channel portion of the present invention. FIG. 14 is a plan view of a second plate according to a third embodiment of the cooling channel portion of the present invention. FIG. 15 is an axial cross-sectional view of a rotor module having a cooling structure according to one embodiment of the present invention. Specific details for implementing the invention

[0028] Hereinafter, the technical concept of the present invention will be explained in more detail using the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, and should be interpreted in a meaning and concept consistent with the technical concept of the present invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention.

[0030] Hereinafter, the basic configuration of a rotor module (1000) having a cooling structure of the present invention will be described with reference to FIG. 1.

[0031] As illustrated in FIG. 1, the present invention may include a rotor core (100) and a rotor shaft (200). More specifically, the rotor core (100) may be formed in a hollow cylindrical shape and may include a magnet that generates an electric field inside. In this case, two layers of magnets may be formed in the radial direction. Additionally, the rotor shaft (200) may rotate around the central axis of the rotor core (100), be fitted and fixed to the center of the rotor core (100), and may include a cooling fluid flow path (230) in which a cooling fluid is filled inside.

[0032] At this time, the rotor core (100) may include a cooling channel section (110). The cooling channel section (110) may be formed such that one end is in communication with a cooling fluid flow channel (230) and the other end is in communication with the outside of the rotor core (100). By inducing the cooling fluid to flow inside the rotor core as well, the cooling channel section (110) can perform more direct rotor cooling and thereby improve the performance of the motor.

[0034] Hereinafter, the cooling channel section (110) of the present invention will be described in more detail with reference to FIGS. 2 to 5.

[0035] As illustrated in FIG. 2, the cooling channel section (110) may include a first channel (111) that is formed radially through the side of the rotor shaft (200) and disperses fluid from the cooling fluid flow channel (230) toward the rotor core (100), and a second channel (112) that is formed axially through the rotor core (100) and communicates with the first channel (111). More specifically, the first channel (111) may be formed at a position corresponding to one end of the rotor core (100) and may be formed in two or more places along the side circumferential direction of the rotor shaft (200). By including the first Euro (111) and the second Euro (112), the fluid flowing in the cooling fluid flow path (230) can be directed to flow out of the rotor shaft (200) and through the inside of the rotor core (100), thereby performing more direct rotor cooling and improving the performance of the motor.

[0036] Additionally, as shown in FIG. 3, the second channel (112) may be formed between the outer magnet (140) and the inner magnet (150) inserted into the rotor core (100), and two or more may be formed along the side circumferential direction of the rotor core (100). That is, the distance between the second channel (112) and the rotation axis of the rotor core (100) may be shorter than the distance between the outer magnet (140) of the rotor core (100) and the rotation axis, and longer than the distance between the inner magnet (150) of the rotor core (100) and the rotation axis. Accordingly, cooling of the outer magnet (140), which is relatively difficult to cool, can be performed easily.

[0037] Additionally, the cooling channel section (110) may include a third channel (113) for communicating with the first channel (111) and the second channel (112). More specifically, the third channel (113) may be formed radially, with one end communicating with the first channel (111) and the other end communicating with the second channel (112). In one embodiment, the third channel (113) may be formed in the rotor core (100) or in the first plate (120). A description related to the first plate (120) will be given later.

[0038] Additionally, the cooling channel section (110) may include a fourth channel (114) formed radially, with one end communicating with the second channel (112), and a first fluid injection hole (115) formed through the other end of the fourth channel (114). In one embodiment, the fourth channel (114) may be formed in the rotor core (100) or in the second plate (130). A description related to the second plate (130) will be provided later. At this time, the third channel (113) and the fourth channel (114) may be located on opposite sides of the rotor core (100), respectively. That is, the third Euro (113) and the first Euro (111) communicating with the third Euro (113) may be located at one end of the rotor core (100), and the fourth Euro (114) may be located at the other end of the rotor core (100).

[0039] That is, the cooling fluid flows out of the rotor shaft (200) through the first fluid path (111) in the cooling fluid flow path, then moves radially to the opposite side of the rotation axis through the third fluid path (113), then moves through the rotor core (100) axially through the second fluid path (112), and after being completely filled in the second fluid path (112), can be moved back to the rotation axis side through the fourth fluid path (114). After that, the fluid can be sprayed outward through the first fluid injection hole (115). Accordingly, as shown in FIG. 4, the first fluid injection hole (115) can be formed at a position such that the distance R2 between the first fluid injection hole and the rotation axis of the rotor core (100) is shorter than the distance R1 between the second fluid path (112) and the rotation axis.

[0040] According to the configuration of the cooling passage section (110) as described above, the fluid flowing through the cooling passage section (110) can be moved back to the rotation axis side through the fourth passage (114) just before it is discharged to the outside of the rotor core (100), and the cooling fluid can be prevented from being pushed to the outside of the passage due to the centrifugal force of the rotor core (100) that is continuously rotating, and finally, NVH issues caused by oil flow imbalance within the core can be prevented.

[0041] Furthermore, as illustrated in FIG. 5, it is preferable that the length L of the fourth fluid channel (114) be formed to be larger than the sum of the diameter d1 of the second fluid channel (112) and the diameter d2 of the first fluid injection hole (115). That is, a certain clearance is included between the second fluid channel (112) and the first fluid injection hole (115), thereby maximizing the effect of the fourth fluid channel (114) described above and preventing fluid from being injected through the first fluid injection hole (115) before the cooling fluid completely fills the second fluid channel (112). Accordingly, fluid can be allowed to flow uniformly along the second fluid channel (112) formed within the core, and the flow rate injected through the first fluid injection hole (115) can also be maintained at a constant level.

[0043] Hereinafter, the first plate (120) and the second plate (130) of the present invention will be described in more detail with reference to FIGS. 6 to 8.

[0044] The rotor core (100) may include a first plate (120), which is a flat plate laminated on one end surface. As shown in FIG. 6, the first plate (120) may have a first insertion hole (121) formed in the center into which a rotor shaft (200) is fitted. The first plate (120) may have a third flow path (113) formed in a groove shape on one end surface that contacts the end surface of the rotor core (100). The third flow path (113) formed on the first plate (120) may be formed in the same number as the first flow path (111) and the second flow path (112), and each may be formed spaced apart at a constant interval. By including the first plate (120), which is a flat plate having a third Euro (113) formed thereon, in a configuration separated from the rotor core (100), the third Euro (113) can be prevented from interfering with the outer magnet (140) and inner magnet (150) of the rotor core (100).

[0045] Additionally, as illustrated in FIG. 7, the rotor core (100) may include a second plate (130), which is a flat plate having a second insertion hole (132) formed in the center into which a rotor shaft (200) is fitted. One side of the second plate (130) may be in contact with the other end of the rotor core (100), and a fourth fluid path (114) may be formed in a groove shape on one side of the second plate (130) that is in contact with the rotor core (100). It is preferable that the first fluid injection hole (115) be formed by penetrating the second plate (130) in the axial direction. The fourth fluid path (114) and the first fluid injection hole (115) may be formed in the same number as the second fluid path (112).

[0046] Furthermore, as illustrated in FIG. 8, the second plate (130) may include a protrusion (131) formed along the circumference of the second insertion hole (132). At this time, the area where the protrusion (131) is formed may overlap with at least a portion of the area where the first fluid injection hole (115) is formed. Accordingly, a groove may be formed on the side of the protrusion (131) to the extent of the area where the first fluid injection hole (115) is formed. Accordingly, the cooling fluid injected through the first fluid injection hole (115) can be guided to be injected to the opposite side of the rotation axis, that is, to the radially outer side of the rotor core (100), and the outer surface of the rotor core (100) can be cooled more efficiently.

[0048] Hereinafter, a first embodiment of the cooling channel section (110) will be described in more detail with reference to FIGS. 9 and 10.

[0049] As illustrated in FIG. 9, the cooling channel section (110) may include a fifth channel (116) that is connected to the third channel (113) and extends from one end of the third channel (113), and a second fluid injection hole (117) that is formed through the end of the fifth channel (116). At this time, as illustrated in FIG. 10, the fifth channel (116) may be formed in a groove shape on one surface of the first plate (120) and extend from the third channel (113). It is preferable that the second fluid injection hole (117) be formed by penetrating the first plate (120) in the axial direction. Accordingly, fluid can be allowed to flow uniformly along the second channel (112) formed within the core, and the flow rate injected through the first fluid injection hole (115) can also be maintained constant.

[0050] Additionally, the fifth fluid channel (116) may be formed in a bent shape to form a U-shape with the third fluid channel (113), and the second fluid injection hole (117) may be formed at a position spaced apart from the third fluid channel (113) in the circumferential direction. Accordingly, the cooling fluid entering the third fluid channel (113) may be separated so that some of it flows into the second fluid channel (112) and the remaining part flows into the fifth fluid channel (116), thereby allowing the cooling fluid to be divided and injected to both sides of the rotor core (100).

[0051] At this time, it is preferable that the distance between the second fluid injection hole (117) and the rotation axis of the rotor core (100) is shorter than the distance between the second fluid path (112) and the rotation axis. More specifically, the distance between the second fluid injection hole (117) and the rotation axis of the rotor core (100) may be the same as the distance between the first fluid injection hole (115) and the rotation axis of the rotor core (100). Accordingly, fluid can be injected at the same flow rate from both sides of the rotor core (100), and the rotor core (100) can be cooled uniformly.

[0053] Hereinafter, a second embodiment of the cooling channel section (110) will be described in more detail with reference to FIG. 11.

[0054] As illustrated in FIG. 11, the cooling channel section (110) may include a third fluid injection hole (118) formed through the third channel (113). More specifically, the third fluid injection hole (118) may be formed at a position spaced apart from the other end of the third channel (113), that is, from a position communicating with the second channel (112), toward one end of the third channel (113). At this time, it is preferable that the third fluid injection hole (118) be formed by penetrating the first plate (120) in the axial direction. By applying the second embodiment of the cooling channel section (110), the cooling fluid entering the third channel (113) may be separated so that a portion flows into the third fluid injection hole (118) and the remaining portion flows into the second channel (112), thereby allowing the cooling fluid to be divided and injected to both sides of the rotor core (100).

[0055] At this time, the distance between the third fluid injection hole (118) and the rotation axis of the rotor core (100) may be the same as the distance between the first fluid injection hole (115) and the rotation axis of the rotor core (100). That is, the distance between the other end of the third fluid path (113) and the third fluid injection hole (118) may be the same as the length of the fourth fluid path (114). Accordingly, it is possible to prevent the cooling fluid from being pushed outward of the fluid path due to the centrifugal force of the rotor core (100) which is continuously rotating, and to allow the fluid to be injected at the same flow rate from both sides of the rotor core (100), and to cool the rotor core (100) uniformly.

[0057] Hereinafter, a third embodiment of the cooling channel section (110) will be described in more detail with reference to FIGS. 12 to 14.

[0058] As illustrated in FIG. 12, the cooling channel section (110) is formed on the first plate (120), and may include a sixth channel (119) formed radially, with one end communicating with one end of the second channel (112), and a fourth fluid injection hole (110a) formed through the other end of the sixth channel (119). That is, at least one part of the second channel (112) may communicate with the third channel (113), and the remaining part may communicate with the sixth channel (119) and the fourth fluid injection hole (110a).

[0059] Additionally, as illustrated in FIG. 13, the cooling channel section (110) may include a seventh channel (110b) that is formed radially through the side of the rotor shaft (200) and disperses fluid from the cooling fluid flow channel (230) toward the rotor core (100). The seventh channel (110b) may be formed to correspond to the other end of the rotor core (100), that is, on the opposite side of the first channel (111).

[0060] Additionally, as illustrated in FIG. 14, it may include an eighth flow path (110c) for communicating with the other end of the seventh flow path (110b) and the second flow path (112). More specifically, the eighth flow path (110c) may be formed radially, with one end communicating with the seventh flow path (110b) and the other end communicating with the other end of the second flow path (112). At this time, the eighth flow path (110c) may be formed in the form of a groove in the second plate (130), and at least a portion of the other end of the second flow path (112) may communicate with the eighth flow path (110c), and the remaining portion may communicate with the fourth flow path (114) and the first fluid injection hole (1105).

[0061] At this time, the sixth fluid passage (119) and the fourth fluid injection hole (110a) of the first plate (120) may be located in an axial line with the seventh fluid passage (110b) of the second plate (130), and the third fluid passage (113) of the first plate (120) may be located in an axial line with the fourth fluid passage (114) and the first fluid injection hole (115) of the second plate (130).

[0062] Additionally, the sixth euro (119) and the third euro (113) of the first plate (120) can be formed in the same number, and the seventh euro (110b) and the fourth euro (114) of the second plate (130) can also be formed in the same number. Furthermore, the sixth euro (119) and the third euro (113) can be arranged alternately with each other, and the seventh euro (110b) and the fourth euro (114) can also be arranged alternately with each other.

[0063] By adopting such a structure, as shown in FIG. 13, some of the fluid flowing through the cooling channel (110) passes through the second channel (112) from one end to the other in the axial direction and is then injected into the other end of the rotor core (100) through the first fluid injection hole (115), and another part of the fluid flowing through the cooling channel (110) passes through the second channel (112) from the other end to one end in the axial direction and is then injected into the one end of the rotor core (100) through the fourth fluid injection hole (110a). In addition, fluid can be sprayed at the same flow rate from both sides of the rotor core (100), but unlike the first and second embodiments of the cooling fluid flow path (110), fluid sprayed in different directions from the cooling fluid flow path (230) can be flowed through separate paths, thereby preventing deviations in flow rate and pressure at the path corresponding to the branch point (third path (113)) and preventing excessive use of the cooling fluid.

[0065] Below, the rotor shaft (200) will be described in more detail with reference to FIG. 15.

[0066] As illustrated in FIG. 15, the rotor module (1000) having the cooling structure of the present invention may further include a supply pipe (300) that supplies cooling fluid into the interior of the cooling fluid flow path (230). At this time, one end of the supply pipe (300) may be fitted onto the rotor shaft (200), and a cooling fluid supply hole (310) may be formed on the side of the fitted end. Additionally, the rotor shaft (200) may include a first part (210) in which a rotor core (100) is fitted onto the side and a cooling fluid flow path (230) is formed, wherein one side of the cooling fluid flow path (230) is formed to be open, and a second part (220) in which a press-fit part (221) is formed at one end and the press-fit part (221) is pressed into one side of the first part (210) and one end of the supply pipe (300) is fitted onto the end. At this time, the supply pipe (300) can be fitted into the second part (220) such that, at one end, that is, the cooling fluid supply hole (310) is positioned closer to the side of the insertion part (221) of the second part (220) than to the axial center of the cooling fluid flow path (230). Accordingly, isolated oil can be minimized and smooth flow can be formed toward the core inlet side.

[0068] The technical concept of the present invention should not be interpreted as being limited to the above-described embodiments. Not only is the scope of application diverse, but various modifications are possible at the level of a person skilled in the art without departing from the essence of the invention claimed in the claims. Accordingly, such improvements and modifications fall within the scope of protection of the present invention insofar as they are obvious to a person skilled in the art. Explanation of the symbols

[0071] 1000: Rotor module with cooling structure 100: Rotor core 110: Cooling passage section 111 : First Euro 112 : 2nd Euro 113 : 3rd Euro 114 : The 4th Euro 115: First fluid injection hole 116 : The 5th Euro 117: Second fluid injection hole 118: Third fluid injection hole 119 : The 6th Euro 110a: 4th fluid injection hole 110b: 7th Euro 110c: The 8th Euro 120 : 1st plate 121 : 1st insertion hole 130 : 2nd plate 131 : Protrusion 132 : Second insertion hole 140 : Outer magnet 150 : Inner magnet 200: Rotor shaft 210 : Part 1 220 : Part 2 221 : Press-fit part 230 : Cooling fluid flow path 300: Supply pipe 310: Cooling fluid supply hole

Claims

Claim 1 A rotor core formed in a hollow cylindrical shape; a rotor shaft fitted and fixed to the center of the rotor core, comprising a cooling fluid flow channel filled with cooling fluid, and rotating around the central axis of the rotor core;The rotor core comprises a cooling fluid passage section having one end communicating with the cooling fluid flow path and the other end communicating with the outside of the rotor core, wherein the cooling fluid passage section comprises a first fluid passage formed through the side of the rotor shaft and dispersing fluid from the cooling fluid flow path toward one end of the rotor core, a second fluid passage formed through the rotor core in the axial direction and communicating with the first fluid passage, a fourth fluid passage formed radially with one end communicating with the other end of the second fluid passage, a first fluid injection hole formed through the other end of the fourth fluid passage, a sixth fluid passage formed radially with one end communicating with one end of the second fluid passage, and a fourth fluid injection hole formed through the other end of the sixth fluid passage, wherein the distance between the first fluid injection hole and the rotation axis of the rotor core is shorter than the distance between the second fluid passage and the rotation axis, and A rotor module having a cooling structure characterized in that a portion of the fluid flowing through the cooling channel passes through the second channel from one end to the other in the axial direction and is injected toward the other end of the rotor core through the first fluid injection hole, and another portion of the fluid flowing through the cooling channel passes through the second channel from the other end to one end in the axial direction and is injected toward the one end of the rotor core through the fourth fluid injection hole, wherein the rotor core is a flat plate having a second insertion hole formed at the center into which the rotor shaft is fitted, and includes a second plate having one surface in contact with the other end surface of the rotor core, and the second plate includes a protrusion formed axially along the circumference of the second insertion hole on the other surface, wherein the protrusion is formed to partially overlap with the area where the first fluid injection hole is formed, and a groove is formed in the area overlapping with the first fluid injection hole to guide the cooling fluid injected through the first fluid injection hole toward the radial outer side of the rotor core. Claim 2 delete Claim 3 A rotor module having a cooling structure according to claim 1, wherein the cooling channel portion includes a third channel formed radially, with one end communicating with the first channel and the other end communicating with the second channel, and the rotor core includes a first plate which is a flat plate having a first insertion hole formed in the center into which the rotor shaft is fitted, one surface of the first plate contacts the end surface of the rotor core, and the third channel is formed in a groove shape on one surface of the first plate. Claim 4 A rotor module having a cooling structure according to claim 3, wherein one surface of the second plate contacts the other end surface of the rotor core, the fourth fluid path is formed in a groove shape on one surface of the second plate, and the first fluid injection hole is formed by penetrating the second plate in the axial direction. Claim 5 delete Claim 6 A rotor module having a cooling structure according to claim 4, characterized in that the length of the fourth fluid path is greater than the sum of the diameter of the first fluid path and the diameter of the first fluid injection hole. Claim 7 A rotor module having a cooling structure according to claim 4, wherein the cooling channel portion is in communication with the third channel and includes a fifth channel extending from one end of the third channel and a second fluid injection hole formed through the end of the fifth channel, wherein the fifth channel is formed in a groove shape on one surface of the first plate and the second fluid injection hole is formed by penetrating the first plate in the axial direction. Claim 8 A rotor module having a cooling structure according to claim 7, characterized in that the distance between the second fluid injection hole and the rotation axis of the rotor core is shorter than the distance between the second fluid path and the rotation axis. Claim 9 A rotor module having a cooling structure according to claim 4, wherein one end of the sixth fluid path is in communication with one end of the second fluid path and is formed in a groove shape in the first plate and is formed radially, and the fourth fluid injection hole is formed by penetrating the first plate at the other end of the sixth fluid path, and the cooling fluid path section further comprises a seventh fluid path formed through the side of the rotor shaft to disperse fluid from the cooling fluid flow path to the other end of the rotor core, and an eighth fluid path, one end of which is in communication with the seventh fluid path and the other end of which is in communication with the second fluid path and is formed in a groove shape in the second plate and is formed radially. Claim 10 A rotor module having a cooling structure according to claim 1, further comprising: a supply pipe for supplying a cooling fluid inside the cooling fluid flow path; wherein the rotor shaft comprises a first part formed such that the rotor core is fitted on its side and the cooling fluid flow path is formed such that one side of the cooling fluid flow path is open, and a second part having a press-fit portion formed at one end, wherein the press-fit portion is press-fitted into one side of the first part and one end of the supply pipe is fitted at one end, and wherein the supply pipe is fitted into the second part such that one end is positioned closer to the side of the press-fit portion than to the axial center of the cooling fluid flow path.

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