Rotor module having cooling structure

Abstract

To provide a rotor module having a cooling structure capable of cooling a rotor more directly, thereby improving motor performance.SOLUTION: The present invention provides a rotor, more specifically, a rotor having improved cooling efficiency. A rotor module having a cooling structure according to the present invention provides a cooling structure including a cooling passage penetrating the inside of a rotor core directly on the rotor, thereby cooling the rotor more directly, and ensuring improved motor performance.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0002] The heat source of the drive motor of an electric vehicle is the coil through which current flows and the electromagnetic steel core through which magnetic flux flows. When the motor is operating, the temperature of these parts rises, and if the temperature becomes too high, the motor will malfunction. To prevent this, it is important to cool the heat source of the motor. For motors, there are oil cooling methods that inject oil directly onto the heat source, and water cooling methods that indirectly cool the heat source by running cooling water through the housing water channel.

[0003] Among them, the oil cooling method uses a cooling pipe that sprays cooling oil to cool the stator, which is the main heat source, and the parts surrounding it. Here, the cooling oil scattered through the cooling pipe cools the motor, which is the heat source, and the hot oil that has been transferred heat is stored at the bottom of the motor, and the oil stored at the bottom of the motor is guided to the reducer through the internal housing flow path that connects the motor and the reducer, and then the oil is used to lubricate the reducer by churning the reducer. In addition, the oil stored in the reducer housing moves to an external heat exchanger through a pump, and the oil that has been cooled by heat exchange with cooling water is circulated again to cool the motor.

[0004] When cooling is performed using the oil cooling method of such a conventional driving motor, a separate cooling pipe is required for cooling, which increases the number of parts and makes it difficult to cool the deep part of the stator core and the rotor core. Also, in the case of the rotor core, it is covered by plates and the stator core / coil, so it is difficult to directly cool it by spraying oil to the outside. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Korean Patent Publication No. 10-2022-0096306 Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been devised to solve the above-mentioned problems, and aims to provide a rotor module having a cooling structure that can cool the rotor more directly by providing a cooling structure including a cooling passage that penetrates the inside of the rotor core directly on the rotor, thereby improving the performance of the motor.

[0007] More specifically, the objective is to provide a rotor module having a cooling structure that improves cooling performance by forming a cooling flow passage in the rotor core so that the core comes into direct contact with cooling oil, and by positioning the flow passage between the outer magnet and the inner magnet, makes it easy to cool the outer magnet, which is relatively difficult to cool.

[0008] Another object of the present invention is to provide a rotor module having a cooling structure that can eliminate imbalance of cooling oil within the core and prevent noise, vibration, and harshness (NVH) problems by providing an outlet hole through which oil flows out in a plate located at the end of the core and positioning the outlet hole radially inward relative to the core flow path. [Means for solving the problem]

[0009] In order to solve the above-mentioned problems, a rotor module having a cooling structure according to one embodiment of the present invention includes a rotor core having a cylindrical shape with a hollow interior, the rotor core including a cooling flow passage portion, and a rotor shaft that is inserted and fixed into the center of the rotor core and rotates around the central axis of the rotor core, the rotor shaft including a cooling fluid flow passage filled with a cooling fluid, one end of the cooling flow passage portion communicating with the cooling fluid flow passage and the other end communicating with the outside of the rotor core.

[0010] The cooling flow passage portion also has a first flow passage that penetrates the side of the rotor shaft and distributes fluid from the cooling fluid flow passage to one end of the rotor core, and a second flow passage that penetrates the rotor core in the axial direction and communicates with the first flow passage.

[0011] The cooling flow passage portion further has a third flow passage arranged in the radial direction, one end of which is connected to the first flow passage and the other end of which is connected to the second flow passage, the rotor core further has a first plate which is a flat plate having a first insertion hole in the center, the rotor shaft is inserted into the first insertion hole, one surface of the first plate contacts one end surface of the rotor core, and the third flow passage is a groove shape on one surface of the first plate.

[0012] The cooling flow passage portion further has a fourth flow passage arranged radially and one end of which is connected to the second flow passage, and a first fluid injection hole penetrating the other end of the fourth flow passage, the rotor core further has a second plate which is a flat plate having a second insertion hole in its center, the rotor shaft is inserted into the second insertion hole, one surface of the second plate contacts the other end surface of the rotor core, the fourth flow passage is groove-shaped on one surface of the second plate, and the first fluid injection hole penetrates the second plate in the axial direction.

[0013] In addition, the distance between the first fluid ejection holes and the rotation axis of the rotor core is shorter than the distance between the second flow passage and the rotation axis.

[0014] Moreover, the length of the fourth flow passage is greater than the sum of the diameter of the second flow passage and the diameter of the first fluid ejection hole.

[0015] The cooling flow passage portion also includes a fifth flow passage extending from one end of the third flow passage and communicating with the third flow passage, and a second fluid injection hole penetrating an end of the fifth flow passage, the fifth flow passage being groove-shaped on one surface of the first plate, and the second fluid injection hole penetrating the first plate in the axial direction.

[0016] In addition, the distance between the second fluid ejection holes and the rotation axis of the rotor core is shorter than the distance between the second flow passage and the rotation axis.

[0017] The cooling flow passage portion further includes a sixth flow passage having one end connected to one end of the second flow passage, the sixth flow passage being groove-shaped in the first plate and disposed in the radial direction thereof, a fourth fluid injection hole formed by penetrating the first plate at the other end of the sixth flow passage, a seventh flow passage formed by penetrating the side of the rotor shaft and dispersing fluid from the cooling fluid flow passage to the other end side of the rotor core, and an eighth flow passage having one end connected to the seventh flow passage and the other end connected to the second flow passage, the eighth flow passage being groove-shaped in the second plate and disposed in the radial direction thereof.

[0018] The rotor shaft further includes a supply pipe for supplying cooling fluid into the cooling fluid flow passage, and the rotor shaft further includes a first part having a cooling fluid flow passage and an open side of the cooling fluid flow passage, the first part having one side into which the rotor core is fitted, and a second part having a press-fit portion located at one end, the press-fit portion being press-fitted into the one side of the first part and one end of the supply pipe being fitted into one end of the second part, and the supply pipe is fitted into the second part such that the one end of the supply pipe is located closer to the one end side of the press-fit portion than to the axial center of the cooling fluid flow passage. Effect of the Invention

[0019] The rotor module having the cooling structure of the present invention configured as described above has a cooling structure including a cooling passage penetrating the inside of the rotor core provided directly on the rotor, thereby providing more direct rotor cooling, thereby having the effect of improving motor performance.

[0020] More specifically, by forming a cooling passage in the rotor core and bringing the core into direct contact with cooling oil, cooling performance is improved, and by positioning the passage between the outer magnet and the inner magnet, it is possible to easily cool the outer magnet, which is relatively difficult to cool.

[0021] In addition, by installing an outlet hole for oil to flow out in the plate located at the end of the core and positioning it radially inward relative to the core flow path, it is possible to eliminate imbalances in the cooling oil within the core and prevent NVH problems. [Brief description of the drawings]

[0022] [Figure 1] 1 is a perspective view illustrating an axial cross section of a rotor module having a cooling structure of the present invention; [Diagram 2] 1 is an axial cross-sectional view of a rotor module having a cooling structure of the present invention; [Diagram 3] FIG. 2 is a radial cross-sectional view of a rotor core of the present invention. [Figure 4] 1 is a partial cross-sectional view of a rotor module having a cooling structure illustrating a fourth flow path of the present invention. [Diagram 5] FIG. 11 is a partial cross-sectional view of a rotor module having a cooling structure illustrating a fourth flow path of the present invention. [Figure 6] FIG. 2 is a plan view of a first plate of the present invention. [Figure 7] FIG. 2 is a plan view of a second plate of the present invention. [Figure 8] FIG. 2 is a partial perspective view of a rotor module having a cooling structure illustrating the protrusions of the present invention. [Figure 9] 1 is an axial cross-sectional view of a rotor module having a cooling structure according to a first embodiment of a cooling flow path portion of the present invention. [Figure 10] FIG. 2 is a plan view of a first plate according to a first embodiment of a cooling channel portion of the present invention. [Figure 11] FIG. 11 is a plan view of a second plate according to a second embodiment of a cooling channel portion of the present invention. [Figure 12] FIG. 10 is a plan view of a first plate according to a third embodiment of a cooling channel portion of the present invention. [Figure 13] 11 is an axial cross-sectional view of a rotor module having a cooling structure according to a third embodiment of the cooling flow path portion of the present invention. FIG. [Figure 14] FIG. 10 is a plan view of a second plate according to a third embodiment of a cooling channel portion of the present invention. [Figure 15] 1 is an axial cross-sectional view of a rotor module having a cooling structure according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] The technical concept of the present invention will be described in more detail below with reference to the accompanying drawings. Prior to this, the terms and words used in the present specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted as meanings and concepts that are consistent with the technical concept of the present invention, in accordance with the principle that the inventors can appropriately define the concepts of terms in order to best describe their invention.

[0024] Hereinafter, the basic configuration of a rotor module 1000 having a cooling structure of the present invention will be described with reference to FIG.

[0025] As shown 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 cylindrical shape with a hollow interior, and may include magnets for generating an electric field therein. Here, the magnets may be formed in two layers in the radial direction. In addition, the rotor shaft 200 may rotate around the central axis of the rotor core 100, may be inserted and fixed in the center of the rotor core 100, and may include a cooling fluid flow passage 230 filled with a cooling fluid therein.

[0026] Here, the rotor core 100 may include a cooling channel unit 110. The cooling channel unit 110 may be formed such that one end is connected to the cooling fluid flow channel 230 and the other end is connected to the outside of the rotor core 100. The cooling channel unit 110 induces the cooling fluid to flow also inside the rotor core, thereby performing more direct rotor cooling, and thus improving the performance of the motor.

[0027] The cooling channel portion 110 of the present invention will be described in more detail below with reference to FIGS.

[0028] 2, the cooling flow passage unit 110 may include a first flow passage 111 that distributes fluid from the cooling fluid flow passage 230 to the rotor core 100, and a second flow passage 112 that is formed through the rotor core 100 in the axial direction and communicates with the first flow passage 111. More specifically, the first flow passage 111 may be formed at a position corresponding to one end of the rotor core 100, and two or more first flow passages may be formed along the circumferential direction of the side of the rotor shaft 200. By including the first flow passage 111 and the second flow passage 112, the fluid flowing through the cooling fluid flow passage 230 may be guided to flow to the outside of the rotor shaft 200 and through the inside of the rotor core 100, thereby performing more direct rotor cooling and thereby improving the performance of the motor.

[0029] 3, the second flow passage 112 may be formed between the outer magnet 140 and the inner magnet 150 inserted in the rotor core 100, and two or more second flow passages 112 may be formed along the circumferential direction of the side surface of the rotor core 100. That is, the distance between the second flow passage 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. This makes it easier to cool the outer magnet 140, which is relatively difficult to cool.

[0030] Also, the cooling channel part 110 may include a third channel 113 for connecting the first channel 111 and the second channel 112. More specifically, the third channel 113 may be formed in a radial direction with one end connected to the first channel 111 and the other end connected to the second channel 112. In one embodiment, the third channel 113 may be formed in the rotor core 100 or the first plate 120. The first plate 120 will be described later.

[0031] In addition, the cooling passage portion 110 may include a fourth passage 114 formed in a radial direction with one end connected to the second passage 112, and a first fluid injection hole 115 formed through the other end of the fourth passage 114. In one embodiment, the fourth passage 114 may be formed in the rotor core 100 or may be formed in the second plate 130. The second plate 130 will be described later. Here, the third passage 113 and the fourth passage 114 may be located on opposite sides of the rotor core 100. That is, the third passage 113 and the first passage 111 connected to the third passage 113 may be located at one end of the rotor core 100, and the fourth passage 114 may be located at the other end of the rotor core 100.

[0032] That is, the cooling fluid flows out of the rotor shaft 200 through the first passage 111 in the cooling fluid flow passage 230, then moves to the opposite side of the rotation axis, i.e., in the radial direction, through the third passage 113, moves axially through the rotor core 100 through the second passage 112, and after being completely filled in the second passage 112, moves again to the rotation axis side through the fourth passage 114. Then, the fluid can be injected to the outside through the first fluid injection hole 115. Thus, the first fluid injection hole 115 can be formed at a position that makes a distance R2 between the first fluid injection hole 115 and the rotation axis of the rotor core 100 shorter than a distance R1 between the second passage 112 and the rotation axis, as shown in FIG.

[0033] With the above-described configuration of the cooling flow passage section 110, the fluid flowing through the cooling flow passage section 110 can move again toward the rotating shaft side via the fourth flow passage 114 just before flowing out to the outside of the rotor core 100, thereby preventing the cooling fluid from being biased to the outside of the flow passage due to the centrifugal force of the rotor core 100 that continues to rotate, and ultimately preventing NVH problems caused by uneven oil flow within the core.

[0034] 5, it is preferable that the length L of the fourth flow passage 114 is greater than the sum of the diameter d1 of the second flow passage 112 and the diameter d2 of the first fluid injection hole 115. That is, a predetermined gap is provided between the second flow passage 112 and the first fluid injection hole 115, thereby maximizing the effect of the fourth flow passage 114 and preventing the cooling fluid from being injected through the first fluid injection hole 115 before the second flow passage 112 is completely filled with the cooling fluid. As a result, the fluid can flow uniformly along the second flow passage 112 formed in the core, and the flow rate injected through the first fluid injection hole 115 can be maintained constant.

[0035] The first plate 120 and the second plate 130 of the present invention will be described in more detail below with reference to FIGS.

[0036] 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 at the center into which the rotor shaft 200 is inserted. The first plate 120 may have a third passage 113 formed in a groove shape on one surface in contact with one end surface of the rotor core 100. The third passages 113 formed in the first plate 120 may be formed in the same number as the first passages 111 and the second passages 112, and may be formed at a predetermined interval from each other. By including the first plate 120 which is a flat plate in which the third passages 113 are formed as a separate structure from the rotor core 100, it is possible to prevent the third passage 113 from interfering with the outer magnet 140 and the inner magnet 150 of the rotor core 100.

[0037] 7, the rotor core 100 may include a second plate 130 which is a flat plate having a second insertion hole 132 formed at the center thereof into which the rotor shaft 200 is inserted. One surface of the second plate 130 may contact the other cross section of the rotor core 100, and the fourth passage 114 may be formed in a groove shape on one surface of the second plate 130 which contacts the rotor core 100. The first fluid injection holes 115 are preferably formed penetrating the second plate 130 in the axial direction. The fourth passages 114 and the first fluid injection holes 115 may be formed in the same number as the second passages 112.

[0038] 8, the second plate 130 may include a protrusion 131 protruding along a periphery of the second insertion hole 132. Here, the region where the protrusion 131 is protruding may overlap with at least a portion of the region where the first fluid injection hole 115 is formed through. As a result, a groove may be formed on a side of the protrusion 131 only in the region where the first fluid injection hole 115 is formed. As a result, the cooling fluid injected through the first fluid injection hole 115 may be injected to the opposite side of the rotation axis, and the outer surface of the rotor core 100 may be cooled more efficiently.

[0039] Hereinafter, a first embodiment of the cooling channel portion 110 will be described in more detail with reference to FIGS.

[0040] As shown in Fig. 9, the cooling channel part 110 may include a fifth channel 116 that is connected to the third channel 113 and is extended from one end of the third channel 113, and a second fluid injection hole 117 that is formed through an end of the fifth channel 116. Here, as shown in Fig. 10, the fifth channel 116 may be formed in a groove shape on one surface of the first plate 120, and may be extended from the third channel 113. The second fluid injection hole 117 is preferably formed to penetrate the first plate 120 in the axial direction. As a result, the fluid may flow uniformly along the second channel 112 formed in the core, and the flow rate injected through the first fluid injection hole 115 may be maintained constant.

[0041] In addition, the fifth flow passage 116 may be bent to form a U-shape together with the third flow passage 113, and the second fluid injection hole 117 may be formed at a position spaced a predetermined distance from the third flow passage 113 in the circumferential direction. As a result, the cooling fluid that has entered the third flow passage 113 is divided, with a portion of it flowing into the second flow passage 112 and the remaining portion flowing into the fifth flow passage 116, so that the cooling fluid can be divided and injected to both sides of the rotor core 100.

[0042] Here, it is preferable that the distance between the second fluid injection holes 117 and the rotation axis of the rotor core 100 is shorter than the distance between the second flow passage 112 and the rotation axis. More specifically, the distance between the second fluid injection holes 117 and the rotation axis of the rotor core 100 may be the same as the distance between the first fluid injection holes 115 and the rotation axis of the rotor core 100. As a result, the fluid can be injected at the same flow rate to both sides of the rotor core 100, and the rotor core 100 can be uniformly cooled.

[0043] In the following, a second embodiment of the cooling channel section 110 will be described in more detail with reference to FIG.

[0044] As shown in FIG. 11, the cooling passage portion 110 may include a third fluid injection hole 118 formed through the third passage 113. More specifically, the third fluid injection hole 118 may be formed at a position spaced apart from the other end of the third passage 113, i.e., a position communicating with the second passage 112, toward one end of the third passage 113 by a predetermined distance. Here, the third fluid injection hole 118 is preferably formed to penetrate the first plate 120 in the axial direction. By applying the second embodiment of the cooling passage portion 110, the cooling fluid entering the third passage 113 is separated, and a part of the cooling fluid flows into the third fluid injection hole 118 and the remaining part flows into the second passage 112, so that the cooling fluid can be divided and injected to both sides of the rotor core 100.

[0045] Here, 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 flow passage 113 and the third fluid injection hole 118 may be the same as the length of the fourth flow passage 114. As a result, the cooling fluid can be prevented from being biased to the outside of the flow passage due to the centrifugal force of the rotor core 100 that continues to rotate, and the fluid can be injected from both sides of the rotor core 100 at the same flow rate, so that the rotor core 100 can be uniformly cooled.

[0046] Hereinafter, the third embodiment of the cooling channel portion 110 will be described in more detail with reference to FIGS.

[0047] 12, the cooling channel part 110 is formed on the first plate 120, and may include a sixth channel 119 formed in a radial direction, one end of which is connected to 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 a portion of one end of the second channel 112 may be connected to the third channel 113, and the remaining portion may be connected to the sixth channel 119 and the fourth fluid injection hole 110a.

[0048] 13, the cooling passage portion 110 may include a seventh passage 110b that is formed radially penetrating a side surface of the rotor shaft 200 and distributes a fluid from the cooling fluid flow passage 230 toward the rotor core 100. The seventh passage 110b may be formed to correspond to the other end of the rotor core 100, i.e., on the opposite side of the first passage 111.

[0049] 14, an eighth flow passage 110c for connecting the seventh flow passage 110b to the other end of the second flow passage 112 may be included. More specifically, the eighth flow passage 110c may be formed in a radial direction with one end connected to the seventh flow passage 110b and the other end connected to the other end of the second flow passage 112. Here, the eighth flow passage 110c may be formed in a groove shape in the second plate 130, and at least a portion of the other end of the second flow passage 112 may be connected to the eighth flow passage 110c, and the remaining portion may be connected to the fourth flow passage 114 and the first fluid ejection hole 1105.

[0050] Here, the sixth flow passage 119 and the fourth fluid injection hole 110a of the first plate 120 may be positioned in an axially aligned line with the seventh flow passage 110b of the second plate 130, and the third flow passage 113 of the first plate 120 may be positioned in an axially aligned line with the fourth flow passage 114 and the first fluid injection hole 115 of the second plate 130.

[0051] In addition, the sixth flow passages 119 and the third flow passages 113 of the first plate 120 may be formed in the same number, and the seventh flow passages 110b and the fourth flow passages 114 of the second plate 130 may be formed in the same number. Furthermore, the sixth flow passages 119 and the third flow passages 113 may be arranged alternately with each other, and the seventh flow passages 110b and the fourth flow passages 114 may also be arranged alternately with each other.

[0052] By adopting such a structure, as shown in FIG. 13, fluid can be sprayed at the same flow rate from both sides of the rotor core 100. Unlike the first and second embodiments of the cooling flow path section 110, fluid sprayed in other directions from the cooling fluid flow path 230 flows through separate paths, thereby preventing variations in flow rate and pressure in the path corresponding to the branching point (third path 113), and preventing excessive use of cooling fluid.

[0053] The rotor shaft 200 is described in more detail below with reference to FIG.

[0054] 15, the rotor module 1000 having the cooling structure of the present invention may further include a supply pipe 300 for supplying a cooling fluid to the inside of the cooling fluid flow passage 230. Here, one end of the supply pipe 300 may be inserted into the rotor shaft 200, and a cooling fluid supply hole 310 may be formed on a side of the inserted one end. In addition, the rotor shaft 200 may include a first part 210 having a side into which the rotor core 100 is inserted, the cooling fluid flow passage 230 formed, and one side of the cooling fluid flow passage 230 opened, and a second part 220 having a press-fit portion 221 formed at one end, the press-fit portion 221 pressed into one side of the first part 210, and one end of the supply pipe 300 inserted into. Here, the supply pipe 300 may be inserted into the second part 220 such that one end, i.e., the cooling fluid supply hole 310, is positioned closer to one end of the press-fit portion 221 of the second part 220 than the axial center of the cooling fluid flow passage 230. This can minimize isolated oil and allow smooth flow to the inlet side of the core.

[0055] The technical concept of the present invention should not be construed as being limited to the above-mentioned embodiment. Needless to say, the scope of application is diverse, and various modifications can be made at the level of a person skilled in the art without departing from the gist of the present invention as claimed in the claims. Therefore, such improvements and modifications belong to the scope of protection of the present invention as long as they are obvious to a person skilled in the art. [Explanation of symbols]

[0056] 1000 Rotor module having cooling structure 100 Rotor Core 110 Cooling flow passage section 111 First Channel 112 Second Flow Path 113 Third Stream 114 4th Stream 115 First Fluid Injection Hole 116 5th Channel 117 Second Fluid Injection Hole 118 3rd Fluid Injection Hole 119 6th Channel 110a Fourth fluid injection hole 110b 7th flow path 110c 8th channel 120 First Plate 121 First insertion hole 130 Second Plate 131 Protrusion 132 2nd 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 channel 300 Supply Pipe 310 Cooling fluid supply hole

Claims

1. A rotor core having a cylindrical shape with a hollow interior, the rotor core including a cooling flow passage portion; a rotor shaft that is fitted and fixed to the center of the rotor core and rotates about a central axis of the rotor core, the rotor shaft including a cooling fluid flow passage filled with a cooling fluid; The cooling flow passage portion has one end communicating with the cooling fluid flow passage and the other end communicating with the outside of the rotor core. A rotor module having a cooling structure.

2. The cooling flow path portion is a first passage extending through a side of the rotor shaft and distributing fluid from the cooling fluid flow passage to one end of the rotor core; a second flow passage that axially passes through the rotor core and communicates with the first flow passage; A rotor module having the cooling structure according to claim 1 .

3. The cooling flow passage portion further includes a third flow passage, one end of which communicates with the first flow passage and the other end of which communicates with the second flow passage, the third flow passage being disposed in a radial direction, The rotor core further includes a first plate that is a flat plate having a first insertion hole at a center thereof, The rotor shaft is inserted into the first insertion hole, The first plate has one surface in contact with one end surface of the rotor core, The third flow path is a groove shape on one surface of the first plate. A rotor module having the cooling structure according to claim 2.

4. The cooling flow passage portion further includes a fourth flow passage, one end of which is connected to the second flow passage and which is disposed in a radial direction, and a first fluid injection hole, which penetrates the other end of the fourth flow passage, The rotor core further includes a second plate that is a flat plate having a second insertion hole at the center, The rotor shaft is inserted into the second insertion hole, The second plate has one surface in contact with the other end surface of the rotor core, the fourth flow path is a groove shape in one surface of the second plate, The first fluid injection hole axially penetrates the second plate. A rotor module having the cooling structure according to claim 3.

5. A distance between the first fluid injection hole and the rotation axis of the rotor core is shorter than a distance between the second flow passage and the rotation axis. A rotor module having the cooling structure according to claim 4.

6. The length of the fourth flow passage is greater than the sum of the diameter of the second flow passage and the diameter of the first fluid ejection hole. A rotor module having the cooling structure according to claim 4.

7. The cooling passage portion includes a fifth passage extending from one end of the third passage and communicating with the third passage, and a second fluid injection hole penetrating an end of the fifth passage, The fifth flow path is a groove shape in one surface of the first plate, The second fluid injection hole axially penetrates the first plate. A rotor module having the cooling structure according to claim 4.

8. A distance between the second fluid injection hole and the rotation axis of the rotor core is shorter than a distance between the second flow passage and the rotation axis. A rotor module having the cooling structure according to claim 7.

9. The cooling flow path portion is a sixth flow passage, one end of which communicates with one end of the second flow passage, the sixth flow passage being groove-shaped in the first plate and disposed in a radial direction thereof; a fourth fluid injection hole formed at the other end of the sixth flow passage through the first plate; a seventh flow passage formed through a side surface of the rotor shaft and dispersing a fluid from the cooling fluid flow passage to the other end side of the rotor core; an eighth flow passage having one end communicating with the seventh flow passage and the other end communicating with the second flow passage, the eighth flow passage being groove-shaped in the second plate and disposed in a radial direction thereof; A rotor module having the cooling structure of claim 4, further comprising:

10. a supply pipe for supplying the cooling fluid into the cooling fluid flow passage; The rotor shaft is a first part having the cooling fluid flow passage and an open side of the cooling fluid flow passage, the first part having one side into which the rotor core is inserted; a second part having a press-fit portion located at one end, the press-fit portion being press-fitted to one side of the first part, and one end of the supply pipe being fitted into the press-fit portion; The supply pipe is fitted into the second part such that one end of the supply pipe is located closer to one end of the press-fitting portion than to the axial center of the cooling fluid flow passage. The rotor module of claim 1 .

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