Cooling structure for rotating machinery
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- MEIDENSHA CORP
- Filing Date
- 2025-01-24
- Publication Date
- 2026-08-05
Smart Images
Figure 2026126565000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a cooling structure for a rotating machine, such as a motor that drives a rotor of a drone, which cools the rotating machine during its operation.
Background Art
[0002] Conventionally, as a rotating machine provided with a cooling structure, for example, a motor described in Patent Document 1 is known. This motor includes a hollow rotating shaft, a rotor fixed to the rotating shaft, a stator provided outside the rotor in the radial direction, a motor case that houses the rotor and the stator, a fan member provided inside the rotating shaft, and an external fan member fixed to the rotating shaft inside the motor case. The above rotating shaft has an air inlet that communicates the inside and outside of the rotating shaft at a predetermined one end in the motor case, and an exhaust port at the other end. Further, the above motor case has a cylindrical stator fixing portion that fixes the stator inside, and a front case and a rear case provided at both ends of the stator fixing portion so as to close their openings respectively. Incidentally, the above motor is disposed between an inverter unit for controlling the motor and a power transmission portion for transmitting the power of the motor to an external device, and a ventilation port that communicates the inside and outside of the motor case is provided in the rear case located on the inverter unit side.
[0003] When the rotating shaft and the rotor rotate during the operation of the above motor, the external fan member fixed to the rotating shaft and the fan member inside the rotating shaft rotate integrally with the rotating shaft. When the above external fan rotates, the air outside the motor case is sucked into the motor case through the ventilation port of the rear case while being sent to the stator and rotor sides. Further, when the fan member inside the rotating shaft rotates, the air inside the motor case is sucked into the rotating shaft through the air inlet of the rotating shaft, flows through the rotating shaft, and then is discharged to the power transmission portion side through the exhaust port of the rotating shaft. As described above, in the above motor, the motor and its peripheral devices are cooled while circulating air inside and outside the motor case and the rotating shaft. [Prior art documents] [Patent Documents]
[0004] [Patent Document 1] Patent No. 6225730 [Overview of the project] [Problems that the invention aims to solve]
[0005] However, in the conventional motors described above, outside air is drawn into the motor case. If the outside air has high humidity or contains moisture from rainwater, moisture can adhere to the rotor and stator inside the motor case, potentially causing short circuits or corrosion. As a result, the motor may not be able to be properly controlled or may even fail.
[0006] The present invention was made to solve the above-mentioned problems, and aims to provide a cooling structure for a rotating machine that can efficiently cool the rotating machine without the rotor or stator inside the rotating machine coming into contact with outside air. [Means for solving the problem]
[0007] To achieve the above objective, the invention according to claim 1 is a cooling structure for a rotating machine that drives a rotor blade, the rotating machine comprising: a rotating shaft extending a predetermined length in the vertical direction and having the center of a rotor blade fixed to its upper end; a rotor fixed to the rotating shaft and rotating integrally with the rotating shaft; a stator facing the rotor with a gap between them; and a case that houses the rotor and stator in a sealed state and rotatably supports the rotating shaft via bearings provided inside, wherein a heat transfer material is provided inside the case between the stator and its peripheral edge to transfer heat generated by the stator to the case, and the case is configured to be cooled by the wind generated by the rotation of the rotor blade accompanying the operation of the rotating machine.
[0008] In this configuration, a rotor fixed to a vertically extending rotating shaft and a stator facing the rotor with a gap between them are housed in a sealed state within a case. A heat transfer material is also provided between the stator and its peripheral edge within the case, and the heat generated in the stator is transferred to the case via the heat transfer material. When the rotating machine is in operation, the rotor rotates, and the rotating shaft rotates together with it, causing the rotor blades fixed to its upper end to also rotate. The wind generated by the rotation of these rotor blades cools the case. As described above, when the rotating machine is in operation, the heat generated in the stator is transferred to the case via the heat transfer material, and the case is cooled by the wind generated by the rotor blades, so the rotor and stator inside the rotating machine do not come into contact with outside air, and the rotating machine can be cooled efficiently.
[0009] The invention according to claim 2 is a cooling structure for a rotating machine as described in claim 1, characterized in that the heat transfer material is formed by injecting a predetermined molten synthetic resin into the case from the outside.
[0010] With this configuration, the heat transfer material is formed by injecting a predetermined molten synthetic resin into the case from the outside. Therefore, a heat transfer material of an appropriate shape can be easily formed between the case and the peripheral edge of the stator inside the case, depending on the size and shape of the case and the stator.
[0011] The invention according to claim 3 is characterized in that, in the cooling structure of a rotating machine described in claim 2, the rotor has a pair of rotors arranged at a predetermined distance apart in the longitudinal direction of the rotation axis, the stator is arranged between the pair of rotors and faces each rotor with a gap in the longitudinal direction of the rotation axis, and the rotating machine is composed of an axial gap motor having a pair of rotors and a stator.
[0012] In this configuration, the rotor has a pair of rotors arranged at a predetermined distance from each other along the length of the rotation axis, and the stator is positioned between the pair of rotors, facing each rotor with a gap in the length of the rotation axis. Since the rotating machine having this pair of rotors and stator is composed of an axial gap motor, it can be realized as an energy-efficient and compact rotating machine.
[0013] The invention according to claim 4 is a cooling structure for a rotating machine as described in claim 3, wherein the rotating shaft is formed in a cylindrical shape, and the rotating shaft has a plurality of intake ports provided below the rotor blades so as to communicate the inside and outside of the rotating shaft for drawing outside air into the rotating shaft, and a plurality of discharge ports provided below the plurality of intake ports so as to communicate the inside and outside of the rotating shaft for discharging the outside air drawn into the rotating shaft to the outside as a refrigerant for cooling the case, and the upper surface of the case is provided with a refrigerant guide section having a plurality of refrigerant passages for guiding the refrigerant discharged from each discharge port to the upper surface of the case.
[0014] In this configuration, a cylindrical rotating shaft extending vertically is provided on this shaft, with multiple intake ports below the rotor blades and multiple discharge ports below these intake ports. These intake and discharge ports communicate with the inside and outside of the rotating shaft. When the rotating machine is in operation, outside air is drawn into the rotating shaft through the intake ports, and this drawn-in outside air is discharged to the outside of the rotating shaft through the discharge ports as a refrigerant to cool the case. Furthermore, a refrigerant guide section is provided on the upper surface of the case, having multiple refrigerant passages that guide the refrigerant to the upper surface of the case. Therefore, the refrigerant discharged from the discharge ports of the rotating shaft is guided to the upper surface of the case through the multiple refrigerant passages of the refrigerant guide section, thereby enabling efficient cooling of the case.
[0015] The invention according to claim 5 is characterized in that, in the cooling structure for a rotating machine described in claim 4, the upper surface of the case is provided with a plurality of ribs that protrude upward to a predetermined height and that extend radially outward from parts other than the refrigerant passage of the refrigerant guide section.
[0016] With this configuration, the top surface of the case is provided with multiple ribs that protrude upward to a predetermined height and extend radially outward from the refrigerant guide section. This allows for increased strength of the top of the case while reducing weight compared to increasing the overall thickness of the top of the case. Furthermore, since the ribs extend radially from parts of the refrigerant guide section other than the refrigerant passage, they do not obstruct the refrigerant being delivered from the refrigerant passage. Moreover, the provision of multiple ribs on the top surface of the case increases the surface area of the top surface of the case, thereby improving the cooling efficiency of the case.
[0017] The invention according to claim 6 is a cooling structure for a rotating machine as described in claim 5, wherein the upper surface of the case is provided with an outer peripheral projection that protrudes upward to a predetermined height and is connected to the radially outer ends of a plurality of ribs, and the outer peripheral projection is provided with a refrigerant discharge hole that penetrates radially between adjacent ribs and discharges the refrigerant to the outside.
[0018] With this configuration, the upper surface of the case is provided with an outer peripheral projection that protrudes upward to a predetermined height, and the radially outer ends of each rib are connected to this outer peripheral projection. This further increases the strength of the upper part of the case and increases the surface area of the upper surface of the case, thereby further improving the cooling efficiency of the case. In addition, the outer peripheral projection is provided with refrigerant discharge holes that penetrate radially between adjacent ribs, so that the refrigerant supplied between adjacent ribs can be discharged to the outside through the refrigerant discharge holes.
[0019] The invention according to claim 7 is a cooling structure for a rotating machine as described in claim 4, wherein the rotating shaft is configured to protrude below the lower surface of the case, the rotating shaft has a plurality of lower discharge ports provided below the lower surface of the case so as to communicate the inside and outside of the rotating shaft, for discharging outside air drawn into the rotating shaft to the outside as a lower coolant to cool the lower part of the case, and the lower surface of the case is provided with a lower coolant guide section having a plurality of lower coolant passages for guiding the lower coolant discharged from each lower discharge port to the lower surface of the case.
[0020] In this configuration, the rotating shaft is configured to protrude below the bottom surface of the case, and multiple lower discharge ports for discharging the lower refrigerant are provided below the bottom surface of the case on the rotating shaft. When the rotating machine is in operation, outside air drawn into the rotating shaft is discharged to the outside of the rotating shaft through the lower discharge ports as a lower refrigerant to cool the bottom surface of the case. In addition, a lower refrigerant guide section is provided on the bottom surface of the case, which has multiple lower refrigerant passages to guide the lower refrigerant to the bottom surface of the case. Therefore, the lower refrigerant discharged from the lower discharge ports of the rotating shaft is guided to the bottom surface of the case through the multiple lower refrigerant passages of the lower refrigerant guide section, thereby allowing the case to be cooled from the bottom side.
[0021] The invention according to claim 8 is a cooling structure for a rotating machine according to any one of claims 4 to 7, characterized in that it has an air guide section provided on the upper part of the case that guides the air generated by the rotation of the rotor blades to a plurality of intake ports.
[0022] With this configuration, the air guide located at the top of the case can guide the air generated by the rotation of the rotor blades to multiple intake ports on the rotating shaft when the rotating machine is in operation. This allows the air generated by the rotation of the rotor blades to be efficiently introduced into the rotating shaft. [Brief explanation of the drawing]
[0023] [Figure 1]The figure shows a drive motor of a drone to which the cooling structure of a rotating machine according to the first embodiment of the present invention is applied. (a) is a longitudinal sectional view, and (b) is a sectional view taken along line A-A of (a). [Figure 2] (a) and (b) respectively correspond to (a) and (b) of FIG. 1, and are explanatory diagrams for explaining the flow of wind and outside air by the rotating blades driven by the drive motor. [Figure 3] (a) shows a state in which the flow of outside air at the lower part of the drive motor is added with respect to FIG. 2(a), and (b) is a sectional view taken along line B-B of (a). [Figure 4] The figure shows a drive motor of a drone to which the cooling structure of a rotating machine according to the second embodiment of the present invention is applied. (a) is a longitudinal sectional view, and (b) is a sectional view taken along line C-C of (a). [Figure 5] (a) and (b) respectively correspond to (a) and (b) of FIG. 4, and are explanatory diagrams for explaining the flow of wind and outside air by the rotating blades driven by the drive motor. [Figure 6] The figure shows a drive motor of a drone to which the cooling structure of a rotating machine according to the third embodiment of the present invention is applied. (a) is a longitudinal sectional view, and (b) is a sectional view taken along line D-D of (a). [Figure 7] (a) and (b) respectively correspond to (a) and (b) of FIG. 6, and are explanatory diagrams for explaining the flow of wind and outside air by the rotating blades driven by the drive motor.
Embodiments for Carrying Out the Invention
[0024] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1(a) is a longitudinal sectional view of a drive motor of a drone to which the cooling structure of a rotating machine according to the first embodiment of the present invention is applied, and FIG. 1(b) is a sectional view taken along line A-A of FIG. 1(a). Although the entire drone is not shown, the drone includes a plurality (for example, four) of the same drive motors 1.
[0025] As shown in Figure 1(a), the drive motor 1 comprises a rotating shaft 2 extending a predetermined length in the vertical direction, two upper and lower rotors 3, 3 fixed to the rotating shaft 2 at a predetermined distance apart in the longitudinal direction, a stator 4 positioned between the two rotors 3, 3 and facing each rotor 3 with a gap between them, and a case 5 that houses the two rotors 3, 3 and the stator 4 in a sealed state and holds the rotating shaft 2 rotatably. Thus, the drive motor 1 is composed of an axial gap motor in which each rotor 3 and the stator 4 face each other with a gap in the longitudinal direction of the rotating shaft 2.
[0026] The rotating shaft 2 is formed in a cylindrical shape, and the central part 6a of the rotor blade 6 is fixed to its upper end. The rotor blade 6 has a central part 6a that is formed in a flat plate shape, and two blades 6b, 6b that extend from the central part in opposite directions for a predetermined length and are configured to twist.
[0027] Furthermore, the upper end of the rotating shaft 2 is provided with multiple intake ports 2a for drawing wind from the rotor blades 6 and outside air into the rotating shaft 2, and multiple discharge ports 2b for discharging the outside air drawn into the rotating shaft 2 to the outside as a refrigerant for cooling the case body 11 of the case 5, which will be described later. Each of the multiple intake ports 2a is configured to communicate the inside and outside of the rotating shaft 2 and to draw in outside air as the rotating shaft 2 rotates, and is arranged at predetermined angles in the circumferential direction of the rotating shaft 2. The multiple discharge ports 2b are located at predetermined positions below the intake ports 2a, each communicating the inside and outside of the rotating shaft 2, and are arranged at predetermined angles in the circumferential direction of the rotating shaft 2. For example, eight of each of the above intake ports 2a and discharge ports 2b are provided.
[0028] Furthermore, the lower end of the rotating shaft 2 is provided with a discharge port 2c (lower discharge port) configured in the same way as the discharge port 2b described above.
[0029] Both rotors 3, 3 are equipped with a disc-shaped rotor core 3a having a predetermined thickness, and a plurality of magnets 3b fixed to the stator 4 side surface of the rotor core 3a in an arrangement that covers the entire circumference. The magnets 3b of each rotor 3 face each other with a gap between them and the stator 4.
[0030] The stator 4 is constructed by providing windings (none of which are shown) on a stator core that has a donut-shaped planar form.
[0031] Case 5 has a box-shaped case body 11, and upper and lower bearing holders 12 and 13 for supporting the rotating shaft 2 are provided at the center of the upper and lower surfaces of the case body 11, respectively. The case body 11 is composed of an upper plate 11a and a lower plate 11b, both of which have a circular planar shape and a predetermined diameter, and are arranged at a predetermined distance from each other in the vertical direction, and a side plate 11c that extends along the entire outer circumference of these plates and has a predetermined height.
[0032] As shown in Figure 1(a), the upper bearing holder 12 (refrigerant guide section) is formed with an upward convex shape, through which the rotating shaft 2 passes vertically, and a bearing 14 is fixed to the inside. The lower bearing holder 13 (lower refrigerant guide section) is formed with a downward convex shape, through which the rotating shaft 2 passes vertically, and a bearing 15 is fixed to the inside. The upper and lower parts of the rotating shaft 2 are rotatably supported by these bearings 14 and 15.
[0033] Furthermore, a heat transfer material 18 is provided inside the case body 11 to transfer heat generated in the stator 4 when the drive motor 1 is operating to the case body 11. This heat transfer material 18 is made of a predetermined synthetic resin (for example, an epoxy-based synthetic resin), and during the manufacture of the drive motor 1, the molten synthetic resin is injected into the case body 11, thereby forming it into a predetermined shape that fills the gap between the peripheral edge of the stator 4 and the inner surface of the case body 11. More specifically, the heat transfer material 18 is filled between the outer peripheral surface of the stator 4 and the side plate 11c of the case body 11, and between the outer peripheral surfaces of the upper and lower surfaces of the stator 4 and the upper plate 11a and lower plate 11b of the case body 11, and its planar shape is formed into a ring shape.
[0034] The upper bearing holder 12 has multiple (eight in Figure 1(b)) refrigerant passages 12a that extend from the inner circumferential surface through which the rotating shaft 2 passes to the lower end of the outer circumferential surface, and guide the refrigerant discharged from the discharge port 2b of the rotating shaft 2 to the upper surface of the case body 11. On the other hand, the lower bearing holder 13 has multiple refrigerant passages 13a (lower refrigerant passages) configured in the same way as the above-mentioned refrigerant passages 12a, and the refrigerant discharged from the lower discharge port 2c of the rotating shaft 2 is guided to the lower surface of the case body 11 via the multiple refrigerant passages 13a. In the upper bearing holder 12, the upper surface of the bearing 14 is positioned to face the refrigerant passages 12a, and similarly, in the lower bearing holder 13, the lower surface of the bearing 15 is positioned to face the refrigerant passages 13a.
[0035] Figures 2(a) and 2(b) correspond to Figures 1(a) and 1(b), respectively, and show the airflow and outside air generated by the rotor blades 6 driven by the drive motor 1. As shown in Figure 2(a), when the drive motor 1 operates and the rotor blades 6 rotate as indicated by the white arrows, an airflow is generated from the top to the bottom of the rotor blades 6.
[0036] In this case, a portion of the outside air, including the generated wind, is drawn into the rotating shaft 2 through each intake port 2a of the rotating shaft 2. The drawn-in outside air is discharged radially outward from the rotating shaft 2 through each discharge port 2b due to the centrifugal force accompanying the rotation of the rotating shaft 2. As shown in Figures 2(a) and (b), the discharged outside air, which is the refrigerant, is guided to the upper surface of the case body 11 through each refrigerant passage 12a of the upper bearing holder 12, and is further sent radially outward on the upper plate 11a of the case body 11. As a result, the bearing 14 of the bearing holder 12 is cooled by the refrigerant flowing through the refrigerant passage 12a, and the upper plate 11a and side plates 11c of the case body 11 are cooled by the refrigerant sent out from the refrigerant passage 12a. As a result, heat is removed from the heat-generating stator 4 and the inside of the case body 11 via the heat transfer material 18 inside the case body 11, and the drive motor 1 can be efficiently cooled.
[0037] Furthermore, this drive motor 1 can also cool the lower plate 11b of the case body 11 via the discharge port 2c on the lower side of the rotating shaft 2 and the coolant passage 13a of the bearing holder 13. Figure 3(a) shows the state in which outside airflow is added to the lower part of the drive motor 1 compared to Figure 2(a).
[0038] As shown in Figure 3(a), when the drive motor 1 is operating, a portion of the outside air drawn into the rotating shaft 2 from each intake port 2a at the upper end of the rotating shaft 2 flows downwards from the rotating shaft 2 and is discharged radially outwards from the rotating shaft 2 through each discharge port 2c at the lower end of the rotating shaft 2. Then, as shown in Figures 3(a) and (b), the discharged outside air, which is the refrigerant, is guided to the lower surface of the case body 11 via each refrigerant passage 13a of the lower bearing holder 13, and is further sent radially outwards from the lower surface of the lower plate 11b of the case body 11. As a result, the bearing 15 of the bearing holder 13 is cooled by the refrigerant flowing through the refrigerant passage 13a, and the lower plate 11b and side plate 11c of the case body 11 are cooled by the refrigerant sent out from the refrigerant passage 13a.
[0039] When the drive motor 1 rotates in the reverse direction, the rotor blades 6 rotate in the opposite direction, generating an upward-flowing airflow. This airflow, along with the surrounding outside air, is drawn in through the opening 2d at the lower end of the rotating shaft 2, as indicated by the dashed arrow in Figure 3(a). The outside air drawn into the rotating shaft 2 through the opening 2d is then discharged to the lower surface of the case body 11 through the outlets 2c at the lower end of the rotating shaft 2 and the coolant passages 13a of the lower bearing holder 13.
[0040] As described above, according to this embodiment, the heat generated in the stator 4 when the drive motor 1 is operating is transferred to the case body 11 via the heat transfer material 18, and the case body 11 is cooled by the outside air including the wind from the rotor blades 6. Therefore, the drive motor 1 can be efficiently cooled without the outside air coming into contact with the rotor 3 or stator 4 inside the case body 11. Furthermore, since the drive motor 1 is an axial gap motor, it has high energy efficiency and can be configured compactly.
[0041] Next, a cooling structure for a rotating machine according to a second embodiment of the present invention will be described with reference to Figures 4 and 5. Figure 4(a) is a longitudinal cross-sectional view of a drive motor 1 to which the cooling structure for a rotating machine according to the second embodiment is applied, and Figure 4(b) is a cross-sectional view along the CC line in Figure 4(a). In this embodiment, the differences from the first embodiment will be described in detail, and the same reference numerals will be used for components identical to those in the first embodiment, and their detailed descriptions will be omitted.
[0042] As shown in Figures 4(a) and (b), in this embodiment, compared to the first embodiment, a plurality of (eight in Figure 4(b)) ribs 21 and ring protrusions 22 (outer peripheral protrusions) are provided on the upper plate 11a of the case body 11. Specifically, each of the plurality of ribs 21 protrudes upward to a predetermined height and extends radially outward from a part of the upper bearing holder 12 other than the refrigerant passage 12a, with the outer end connected to the ring protrusion 22.
[0043] On the other hand, the ring-shaped projection 22 protrudes upward to a height similar to that of the rib 21 and is formed in a ring shape that extends along the entire outer circumference of the upper plate 11a. In addition, the ring-shaped projection 22 is provided with multiple (eight in Figure 4(b)) refrigerant discharge holes 22a that penetrate radially between adjacent ribs 21, 21 in the circumferential direction and discharge the refrigerant to the outside.
[0044] Although not shown in the diagram, it is also possible to provide ribs and ring-shaped protrusions similar to the ribs 21 and ring-shaped protrusions 22 described above on the lower surface of the lower plate 11b of the case body 11.
[0045] Figures 5(a) and 5(b) correspond to Figures 4(a) and 4(b), respectively, and, similar to the first embodiment described above, show the flow of wind and outside air caused by the rotor blade 6 driven by the drive motor 1. As shown in Figures 5(a) and 5(b), in this embodiment, similar to the first embodiment described above, the rotor blade 6 is rotated by the drive motor 1, generating wind that flows from above to below the rotor blade 6. A portion of the outside air, including the generated wind, is drawn into the rotating shaft 2 through each intake port 2a of the rotating shaft 2, and this drawn-in outside air is guided to the upper surface of the case body 11 through each discharge port 2b of the rotating shaft 2 and each refrigerant passage 12a of the bearing holder 12. The refrigerant, which is outside air sent out from each refrigerant passage 12a, is supplied to the space surrounded by two adjacent ribs 21, 21 and the ring protrusion 22, thereby cooling the upper plate 11a of the case body 11. Furthermore, the refrigerant supplied to the above space can be discharged radially outward through the refrigerant discharge hole 22a of the ring protrusion 22.
[0046] As described above, this embodiment provides the same effects as the first embodiment described above, namely, the drive motor 1 can be efficiently cooled without the rotor 3 and stator 4 inside the case body 11 coming into contact with outside air. Furthermore, in this embodiment, since a plurality of ribs 21 and ring protrusions 22 are provided on the upper plate 11a of the case body 11, the strength of the upper part of the case body 11 can be increased while reducing the weight compared to the case where the thickness of the upper plate 11a is increased. In addition, the surface area of the upper surface of the case body 11 can be increased, and as a result, the cooling efficiency of the case body 11 can be improved.
[0047] Next, a cooling structure for a rotating machine according to a third embodiment of the present invention will be described with reference to Figures 6 and 7. Figure 6(a) is a longitudinal cross-sectional view of a drive motor 1 to which the cooling structure for a rotating machine according to the third embodiment is applied, and Figure 6(b) is a cross-sectional view along the DD line in Figure 6(a).
[0048] As shown in Figures 6(a) and (b), this embodiment differs from the second embodiment only in that the drive motor 1 is provided with a wind guide section 31. This wind guide section 31 guides a portion of the wind generated by the rotation of the rotor blades 6 to each intake port 2a of the rotating shaft 2. Specifically, the wind guide section 31 is a flat plate fixed to the upper surface of the bearing holder 12 and through which the rotating shaft 2 passes. It consists of a flat section 31a with a circular planar shape and an inclined section 31b that extends diagonally for a predetermined length, connecting to the entire outer circumference and widening upwards.
[0049] Figures 7(a) and 7(b) correspond to Figures 6(a) and 6(b), respectively, and, similar to the first and second embodiments described above, show the flow of wind and outside air caused by the rotor blade 6 driven by the drive motor 1. As shown in Figures 7(a) and 7(b), in this embodiment, similar to the first and second embodiments described above, the rotor blade 6 is rotated by the drive motor 1, generating wind flowing from above the rotor blade 6 downwards. In this case, the wind generated near the center 6a of the rotor blade 6 strikes the flat portion 31a and inclined portion 31b of the wind guide portion 31 from above, and is guided towards the central rotating shaft 2. As a result, the wind generated by the rotation of the rotor blade 6 is drawn into the rotating shaft 2 through each intake port 2a of the rotating shaft 2. The outside air drawn into the rotating shaft 2 flows in the same manner as in the second embodiment described above.
[0050] As described above, this embodiment provides the same effects as the first and second embodiments described above. Furthermore, in this embodiment, since the drive motor 1 is provided with a wind guide 31, the wind generated by the rotation of the rotor blade 6 can be efficiently introduced into the rotating shaft 2, thereby improving the cooling performance of the drive motor 1.
[0051] It should be noted that the present invention is not limited to the embodiments described above and can be implemented in various forms. For example, in the embodiments, an axial gap motor is used as the drive motor 1, but the present invention is not limited to this, and other motors such as radial gap motors can also be used. Furthermore, the detailed configurations of the drive motor 1, rotating shaft 2, rotor 3, stator 4, and case 5 shown in the embodiments are merely examples and can be modified as appropriate within the scope of the spirit of the present invention. [Explanation of Symbols]
[0052] 1. Drive motor (rotating machine) 2 rotation axes 2a Inlet 2b Outlet 2c Lower discharge port (bottom discharge port) 3 rotors 3a Rotor core 3b magnet 4 stata 5 cases 6 rotor blades 6a Center of the rotor blade 6b Rotary blades 11 Case body 12 Upper bearing holder (refrigerant guide section) 12a Refrigerant passage 13. Lower bearing holder (lower refrigerant guide section) 13a Refrigerant passage (lower refrigerant passage) 14 Upper bearing 15 Lower bearing 18 Heat transfer material 21 Ribs 22 Ring protrusion (outer circumference protrusion) 22a Refrigerant discharge hole 31 Wind guide section
Claims
1. A cooling structure for a rotating machine that drives a rotor blade, The aforementioned rotating machine is A rotating shaft that extends a predetermined length in the vertical direction, with the central part of the rotor blade fixed to its upper end, A rotor fixed to this rotating shaft and rotating integrally with the said rotating shaft, This rotor and the stator, which is separated by a gap, A case that houses the rotor and stator in a sealed state and supports the rotating shaft rotatably via bearings provided inside, Equipped with, Inside the case, a heat transfer material is provided between the stator and its peripheral edge to transfer the heat generated by the stator to the case. The cooling structure for a rotating machine is characterized in that the case is configured to be cooled by the wind generated by the rotation of the rotor blades accompanying the operation of the rotating machine.
2. The cooling structure for a rotating machine according to claim 1, characterized in that the heat transfer material is formed by injecting a predetermined molten synthetic resin into the case from the outside.
3. The rotor has a pair of rotors arranged at a predetermined distance apart in the longitudinal direction of the rotation axis, The stator is positioned between the pair of rotors, and faces each rotor with a gap in the longitudinal direction of the rotation axis. The cooling structure for a rotating machine according to claim 2, characterized in that the rotating machine is composed of an axial gap motor having the pair of rotors and stators.
4. The aforementioned rotating shaft is formed in a cylindrical shape, The aforementioned rotating shaft is Below the rotor blade, a plurality of intake ports are provided to connect the inside and outside of the rotating shaft and to draw outside air into the rotating shaft, Below the aforementioned plurality of intake ports, there are a plurality of discharge ports provided to connect the inside and outside of the rotating shaft, for discharging outside air drawn into the rotating shaft to the outside as a refrigerant for cooling the case, It has, The cooling structure for a rotating machine according to claim 3, characterized in that the upper surface of the case is provided with a refrigerant guide section having a plurality of refrigerant passages for guiding the refrigerant discharged from each of the discharge ports to the upper surface of the case.
5. The cooling structure for a rotating machine according to claim 4, characterized in that the upper surface of the case is provided with a plurality of ribs that protrude upward to a predetermined height and extend radially outward from parts of the refrigerant guide other than the refrigerant passage.
6. The upper surface of the case is provided with an outer peripheral projection that protrudes upward to a predetermined height and is connected to the radially outer ends of the plurality of ribs. The cooling structure for a rotating machine according to claim 5, characterized in that the outer peripheral protrusions are provided with refrigerant discharge holes that penetrate radially between adjacent ribs and discharge refrigerant to the outside.
7. The rotating shaft is configured to protrude below the lower surface of the case. The rotating shaft is provided below the lower surface of the case, with the inside and outside of the rotating shaft in communication, and has a plurality of lower discharge ports for discharging outside air drawn into the rotating shaft to the outside as a lower coolant to cool the lower part of the case. The cooling structure for a rotating machine according to claim 4, characterized in that the lower surface of the case is provided with a lower refrigerant guide section having a plurality of lower refrigerant passages for guiding the lower refrigerant discharged from each of the lower discharge ports to the lower surface of the case.
8. A cooling structure for a rotating machine according to any one of 4 to 7, characterized in that it has an air guide section provided on the upper part of the case for guiding the air generated by the rotation of the rotor blades to the plurality of intake ports.