Rotating electric machine

Abstract

To provide a rotating electric machine that can efficiently cool the magnets embedded in the rotor while suppressing cost increases. [Solution] The rotating electric machine 1 comprises a rotor core 10 supported by a shaft 11 and having a plurality of magnets 20 fixed in the circumferential direction, and a stator core 2 into which a coil 3 is inserted. The rotor core 10 has an oil flow passage 30 through which oil 6 flows by connecting at least a part of the fixing portion 25 that fixes the magnets 20 in the axial direction of the shaft 11. The shaft 11 is provided with a supply fan 40 on one end that is the supply side of the oil flow passage 30. The supply fan 40 rotates integrally with the shaft 11 and is characterized by supplying oil 6 to the oil flow passage 30. The supply fan 40 is provided with a through hole 41 at a position facing the coil 3, and the through hole 41 can discharge the oil 6 toward the coil 3.

Description

Technical Field

[0001] The present invention relates to a rotating electric machine provided in a vehicle such as an electric vehicle or a hybrid vehicle.

Background Art

[0002] In recent years, electric vehicles and hybrid vehicles have been provided. In such electric vehicles and hybrid vehicles, for example, when the temperature of the stator coil in a drive rotating electric machine (motor) rises, the resistance value increases, making it difficult for current to flow, and it is known that the power consumption decreases. Further, as the temperature of the stator coil rises, the temperature of the magnet (permanent magnet) in the rotor also rises, resulting in a decrease in magnetic force. Thereby, problems such as a decrease in the rotational speed and torque of the rotating electric machine are also considered to occur.

[0003] Therefore, conventionally, oil (fluid) such as ATF (Automatic Transmission Fluid) stored in a case such as a transaxle is sucked up by a pump and poured over the outside of the stator coil through a cooling oil passage (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the conventional technology described in Patent Document 1 mentioned above does not directly apply oil to the magnet embedded in the rotor, so there is a problem that the cooling efficiency deteriorates. Therefore, in order to improve the heat resistance of the magnet, a heavy rare earth element is added to the magnet, which also causes a problem that the cost of the magnet increases. Further, there is also a problem that the cost increases, such as the need to form a cooling oil passage.

[0006] Therefore, the present invention aims to provide a rotating electric machine that can efficiently cool magnets (permanent magnets) embedded in the rotor while suppressing cost increases. [Means for solving the problem]

[0007] (1) The present invention, provided to solve the above-mentioned problems, is a rotating electric machine comprising a rotor core supported by a shaft and having a plurality of magnets fixed in the circumferential direction, and a stator core into which a coil is inserted, wherein the rotor core has an oil passage for circulating oil formed by communicating at least a part of the fixing portion for fixing the magnets in the axial direction of the shaft, the shaft has a supply fan on one end that is on the supply side of the oil passage, the supply fan rotates integrally with the shaft and sends the oil into the oil passage.

[0008] In the rotating electric machine (also referred to as an electric motor) of the present invention described above, an oil flow passage is formed by connecting at least a part of the fixing portion that holds the magnet in place in the axial direction of the shaft. Furthermore, in the rotating electric machine of the present invention, as the rotor core shaft rotates, oil is supplied to the oil flow passage by a supply fan (also referred to as a primary fan or upstream fan). As a result, the rotating electric machine of the present invention can circulate oil through the oil flow passage formed in the fixing portion of the magnet as the rotating electric machine rotates, thereby directly cooling the magnet. Therefore, the rotating electric machine of the present invention can significantly improve its cooling performance. Here, the supply fan can be any type of fan (e.g., a screw fan, a supply pump impeller, etc.) that can supply oil drawn in from the outside of the rotating electric machine toward the inside of the oil flow passage.

[0009] Furthermore, the rotating electric machine of the present invention can rotate the supply fan using the shaft of the rotor core, thereby improving the cooling performance of the magnets while suppressing cost increases due to the addition of a drive source. In addition, the rotating electric machine of the present invention can form an oil flow passage using the fixed part of the magnets. As a result, the rotating electric machine of the present invention does not require separate piping of the oil flow passage, thus suppressing cost increases and allowing the rotating electric machine to be made more compact.

[0010] (2) In the rotating electric machine of the present invention as described above, the shaft is provided with a discharge fan on the other end of the oil passage which is the oil discharge side, and the discharge fan rotates integrally with the shaft and discharges the oil from the oil passage.

[0011] As described above, the rotating electric machine of the present invention, when configured as described in (2) above, can actively discharge the oil flowing through the oil passage. As a result, the rotating electric machine of the present invention can discharge the high-temperature oil that has exchanged heat with the magnet from the oil passage, thereby improving the cooling efficiency of the magnet. Furthermore, in the rotating electric machine of the present invention, the discharge fan is driven to rotate using the shaft of the rotor core, so the cost increase due to the addition of a drive source can be suppressed.

[0012] (3) In the rotating electric machine of the present invention described above, the supply fan is preferably characterized in that a through hole is provided at a position facing the coil, and the through hole is capable of discharging the oil sucked up by the supply fan toward the coil.

[0013] As described above, the rotating electric machine of the present invention, when configured as described in (3) above, can discharge the oil drawn up by the supply fan toward the coil. Therefore, the rotating electric machine of the present invention can cool both the magnet and the coil, thereby significantly improving the cooling performance.

[0014] (4) The rotating electric machine of the present invention described above is preferably characterized in that it is provided with an oil reservoir for storing the oil, at least a part of the stator core and the rotor core are immersed in the oil stored in the oil reservoir, and the supply fan, as it rotates, scoops up the oil stored in the oil pan and sends the scooped-up oil into the oil flow passage.

[0015] As described above, the rotating electric machine of the present invention, when configured as described in (4) above, can scoop up the oil stored in the oil reservoir and send it to the oil flow passage. Therefore, the rotating electric machine of the present invention can circulate oil in the oil flow passage without providing a separate oil supply pump, thereby improving the cooling performance of the magnet while suppressing cost increases. Here, the oil reservoir can be an oil pan or a case that houses the rotating electric machine (for example, a transaxle housing case).

[0016] (5) The rotating electric machine of the present invention described above is preferably characterized in that the supply fan is a turbo fan.

[0017] As described above, the rotating electric machine of the present invention, when configured as described in (5) above, can improve the oil suction force, thereby ensuring that oil is reliably delivered to the oil flow passage. Furthermore, by repurposing, for example, a turbo fan prepared for the production of turbo vehicles, it is expected that the development and production costs of the turbo fan can be reduced.

[0018] (6) The rotating electric machine of the present invention described above is preferably characterized in that the supply fan and the discharge fan are turbo fans.

[0019] As described above, the rotating electric machine of the present invention, when configured as described in (6) above, can improve the oil suction force, thereby ensuring that oil is reliably delivered to the oil flow passage. Furthermore, by repurposing, for example, a turbo fan prepared for the production of turbo vehicles, it is expected that the development and production costs of the turbo fan can be reduced.

[0020] (7) The rotating electrical machine of the present invention described above is characterized in that the magnet is a heavy rare earth-free neodymium magnet containing no heavy rare earth elements.

[0021] By configuring the rotating electrical machine of the present invention as described in (7) above, the cost of the magnet can be reduced.

[0022] (8) In the rotating electrical machine of the present invention described above, the outer side along the axial direction of the magnet of the fixed portion is covered with a covering member, and a part of the covering member along the axial direction of the magnet is cut out from one end side to the other end side of the magnet in the axial direction of the magnet. It is good to be characterized by that.

[0023] By configuring the rotating electrical machine of the present invention as described in (8) above, while ensuring the fixation of the magnet to the rotor core, an oil flow path can be formed in the fixed portion. Therefore, the rotating electrical machine of the present invention can suppress a cost increase and can make the rotating electrical machine more compact compared to the case where an oil flow path is provided separately.

Effect of the Invention

[0024] According to the present invention, it is possible to provide a rotating electrical machine that can efficiently cool a permanent magnet (simply also referred to as a magnet) embedded in a rotor while suppressing a cost increase.

Brief Description of the Drawings

[0025] [Figure 1] It is a schematic cross-sectional view in the front direction of a rotating electrical machine according to an embodiment of the present invention. [Figure 2] It is a view seen in the direction of arrow A - A in FIG. 1. [Figure 3] It is a view seen in the direction of arrow B - B in FIG. 1. [Figure 4] (a) is a cross-sectional view of a magnet used in a rotating electrical machine according to an embodiment of the present invention as seen from the axial direction, and (b) is a perspective view of the magnet used in a rotating electrical machine according to an embodiment of the present invention. [Modes for carrying out the invention]

[0026] The following describes in detail a rotating electric machine 1 according to one embodiment of the present invention, with reference to the drawings. Note that the figures are schematic representations for ease of understanding and may differ from the actual shape, size, and arrangement of components. Also, reference numerals for similar members may be omitted in the figures. Furthermore, in the following description, the axial direction of the shaft 11 may be simply referred to as the axial direction. Also, note that in Figure 2, hatching of cross-sections other than the magnet 20 has been omitted.

[0027] Figure 1 is a schematic cross-sectional view of the rotating electric machine 1 of the present invention, as seen from the front. The rotating electric machine 1 includes a stator core 2, a stator coil 3 (also referred to as coil 3), a rotor core 10, a magnet 20, an oil flow passage 30, a supply fan 40, a discharge fan 50, and the like. The rotating electric machine 1 also includes an oil reservoir 5 formed by a housing case 4 (partially omitted in the figure).

[0028] The rotating electric machine 1 is housed in a housing case 4 (for example, a transaxle case). The housing case 4 has an oil reservoir 5 (also called an oil pan 5) formed inside (at the bottom), and oil 6 is stored in the oil reservoir 5. For example, automatic transmission fluid (ATF) is used for the oil 6. In this embodiment, at least a portion of the stator core 2 and rotor core 10, which will be described later, is immersed in the oil 6. The oil 6 is responsible for lubrication and cooling of gears (not shown) inside the housing case 4, operation of the transmission, and cooling of the magnet 20 and other components in this embodiment.

[0029] As shown in Figure 2, the stator core 2 is formed in an annular shape. The stator core 2 has a plurality of slots (not shown) in the radial direction, and coils 3 (see Figure 1) are inserted into these slots.

[0030] The rotor core 10 is formed in an annular shape and is incorporated into the inner circumference of the stator core 2 at a predetermined distance from the stator core 2. A shaft 11 is inserted into the axis of the rotor core 10 so as to extend along the axial direction of the rotor core 10. The rotor core 10 is supported by the shaft 11 and can rotate integrally with the shaft 11. The rotor core 10 also has multiple magnet insertion holes (not shown) formed in the circumferential direction for inserting and supporting multiple magnets 20 (permanent magnets 20). The shaft 11 is also provided with a supply fan 40 and an exhaust fan 50 (see Figure 1), which will be described later. The shaft 11 can be rotated by energizing the coil 3 or by the driving force of the vehicle.

[0031] The magnet insertion hole extends through the shaft 11 along its axial direction, allowing the magnet 20 to be inserted through it. In this embodiment, the magnet 20 is inserted into and fixed in the magnet insertion hole via a fixing portion 25 for the magnet 20, which will be described later.

[0032] As shown in Figures 1 and 4(b), the magnet 20 is formed in a rod shape so as to extend along the shaft 11 (see Figure 1). The magnet 20 also has a rectangular cross-section perpendicular to the axial direction. In this embodiment, the magnet 20 is made of a heavy rare earth-free neodymium magnet, for example, one that does not contain heavy rare earth elements (such as dysprosium or terbium). As shown in Figure 2, multiple magnets (16 in this embodiment) are provided circumferentially so that the north and south poles are arranged alternately. In this embodiment, pairs of magnets 20, 20 are arranged in a V-shape relative to each other. As shown in Figures 4(a) and 4(b), at least a portion of the magnet 20 is covered with a covering member 26 (for example, molded resin) as a fixing part 25.

[0033] In this embodiment, the fixing portion 25 is provided to cover the outer circumference of two diagonal corners 21,21,21 of the four corners 21,21,21,21 of the magnet 20. The fixing portion 25 can be formed, for example, by first forming it to cover the outer circumference of the magnet 20 around its axis, and then removing (peeling, cutting, etc.) the covering member 26 around the other two corners 21,21 along the axial direction, leaving the outer circumference of the two diagonal corners 21,21 intact. At this time, the portion of the fixing portion 25 from which the covering member 26 has been removed forms an oil flow passage 30, which will be described later.

[0034] The magnet 20 is fixed to the rotor core 10 via a fixing portion 25 by being inserted into a magnet insertion hole (not shown) in the rotor core 10. At this time, the portion of the fixing portion 25 from which the covering member 26 has been removed is formed to extend in the axial direction of the shaft 11, so that it communicates with the rotor core 10 from one end to the other in the axial direction. As a result, an oil flow passage 30 is formed in the rotor core 10 that communicates with the axial direction of the shaft 11.

[0035] The oil passage 30 allows oil 6 to flow from one end (the supply side of oil 6) to the other end (the discharge side of oil 6) in the axial direction of the magnet 20. In other words, the oil passage 30 allows oil 6 to flow from one end (the supply side of oil 6) to the other end (the discharge side of oil 6) in the axial direction of the rotor core 10.

[0036] As shown in Figure 1, the supply fan 40 (also referred to as the primary fan 40 or upstream fan 40) is, for example, a turbo fan. The supply fan 40 may be made of various materials having a predetermined heat resistance, such as ceramics or metal. The supply fan 40 is supported on one end of the shaft 11 and can rotate integrally with the shaft 11. The supply fan 40 is supported on the shaft 11 so as to generate an airflow (liquid flow) from the outside in the axial direction of the rotor core 10 toward the inside (rotor core 10 side). At least a portion of the supply fan 40 is immersed in oil 6. Therefore, when the supply fan 40 rotates in conjunction with the rotation of the shaft 11, the oil 6 is scooped up and drawn into the supply fan 40. The oil 6 drawn up by the supply fan 40 is then sent toward the end face of the rotor core 10 that intersects the axial direction. As a result, oil 6 is sent to the supply side (upstream side, primary side) of the oil flow passage 30 that opens at the end face of the rotor core 10. The oil 6 flowing through the oil passage 30 comes into direct contact with the surface of the magnet 20, thereby absorbing heat from the magnet 20 and being discharged from the discharge side (downstream side, secondary side) of the oil passage 30.

[0037] Furthermore, as shown in Figures 1 and 3, the supply fan 40 has a through hole 41. The through hole 41 is formed in a direction intersecting the axial direction (for example, a perpendicular direction) at a position opposite the coil 3. The through hole 41 allows the oil 6 drawn up by the supply fan 40 to be discharged toward the coil 3. In this embodiment, the centrifugal force generated by the rotation of the supply fan 40 causes the oil 6 to be discharged from the through hole 41 toward the coil 3. As a result, the coil 3 is cooled by the oil 6.

[0038] The exhaust fan 50 (also referred to as the secondary fan 50 or downstream fan 50) is, for example, a turbo fan. The exhaust fan 50 may be made of various materials having a predetermined heat resistance, such as ceramics or metal. The exhaust fan 50 is supported on the other end of the shaft 11 and can rotate integrally with the shaft 11. The exhaust fan 50 is supported on the shaft 11 so that an airflow is generated from the rotor core 10 side toward the axial outward direction (exhaust side, downstream side, secondary side). When the exhaust fan 50 rotates in conjunction with the rotation of the shaft 11, it can draw out the oil 6 flowing through the oil passage 30 in the discharge direction. As a result, the oil 6 drawn out by the exhaust fan 50 is discharged from the oil passage 30. In other words, the exhaust fan 50 can promote the discharge of the oil 6 flowing through the oil passage 30.

[0039] The above describes one embodiment of the rotating electric machine 1 of the present invention. Next, the effects and advantages realized by the rotating electric machine 1 of the present invention will be described in detail below.

[0040] The rotating electric machine 1 of the present invention, as described above, has the following characteristic configurations (a) to (h). Therefore, the rotating electric machine 1 of the present invention can achieve unique effects that cannot be achieved with the prior art, as described below.

[0041] (a) The rotating electric machine 1 according to the above embodiment comprises a rotor core 10 supported by a shaft 11 and having a plurality of magnets 20 fixed in the circumferential direction, and a stator core 2 into which a coil 3 is inserted, wherein the rotor core 10 has an oil flow passage 30 for circulating oil 6 formed by connecting at least a part of the fixing portion 25 for fixing the magnets 20 in the axial direction of the shaft 11, and the shaft 11 has a supply fan 40 on one end that is the supply side of the oil flow passage 30, and the supply fan 40 rotates integrally with the shaft 11 and sends oil 6 into the oil flow passage 30.

[0042] In the rotating electric machine 1 (also referred to as an electric motor) of the above-described embodiment, at least a portion of the fixing part 25 that fixes the magnet 20 is connected in the axial direction of the shaft 11, thereby forming an oil flow passage 30. Furthermore, in the rotating electric machine 1 of this embodiment, as the shaft 11 of the rotor core 10 rotates, oil 6 is supplied to the oil flow passage 30 by a supply fan 40 (also referred to as a primary fan 40 or upstream fan 40). As a result, the rotating electric machine 1 of this embodiment can circulate oil 6 in the oil flow passage 30 formed in the fixing part 25 of the magnet 20 as the rotating electric machine 1 rotates, thereby directly cooling the magnet 20. Therefore, the rotating electric machine 1 of this embodiment can significantly improve its cooling performance. Here, the supply fan 40 can be any type of fan (for example, a screw fan, a supply pump impeller, etc.) that can supply oil 6 drawn in from the outside of the rotating electric machine 1 towards the inside of the oil flow passage 30.

[0043] Furthermore, in this embodiment, the rotating electric machine 1 can rotate the supply fan 40 using the shaft 11 of the rotor core 10, thereby improving the cooling performance of the magnet 20 while suppressing cost increases due to the addition of a drive source. In addition, in this embodiment, the rotating electric machine 1 can form an oil flow passage 30 using the fixing part 25 of the magnet 20. As a result, in this embodiment, the rotating electric machine 1 does not need to pipe the oil flow passage 30 separately, thus suppressing cost increases and allowing the rotating electric machine 1 to be made more compact.

[0044] (b) In the rotating electric machine 1 of this embodiment described above, the shaft 11 is provided with a discharge fan 50 on the other end side which is the discharge side of the oil 6 in the oil passage 30, and the discharge fan 50 rotates integrally with the shaft 11 and discharges the oil 6 from the oil passage 30.

[0045] The rotating electric machine 1 of this embodiment, as described above, can be configured as shown in (b) above to actively discharge the oil 6 flowing through the oil passage 30. As a result, the rotating electric machine 1 of this embodiment can discharge the high-temperature oil 6 that has exchanged heat with the magnet 20 from the oil passage 30, thereby improving the cooling efficiency of the magnet 20. Furthermore, in the rotating electric machine 1 of this embodiment, the discharge fan 50 is driven to rotate using the shaft 11 of the rotor core 10, thus suppressing cost increases due to the addition of a drive source.

[0046] (c) In the rotating electric machine 1 of the above embodiment, the supply fan 40 is provided with a through hole 41 at a position facing the coil 3, and the through hole 41 is characterized in that the oil 6 sucked up by the supply fan 40 can be discharged toward the coil 3.

[0047] As described above, the rotating electric machine 1 of this embodiment, when configured as shown in (c) above, can discharge the oil 6 drawn up by the supply fan 40 toward the coil 3. Therefore, the rotating electric machine 1 of this embodiment can cool both the magnet 20 and the coil 3, thereby significantly improving the cooling performance.

[0048] (d) The rotating electric machine 1 of this embodiment described above is provided with an oil reservoir 5 for storing oil 6, at least a portion of the stator core 2 and rotor core 10 are immersed in the oil 6 stored in the oil reservoir 5, and the supply fan 40, as it rotates, scoops up the oil 6 stored in the oil reservoir 5 and sends the scooped-up oil 6 into the oil flow passage 30.

[0049] The rotating electric machine 1 of this embodiment, as described above, can be configured as shown in (d) above to scoop up the oil 6 stored in the oil reservoir 5 and send it to the oil flow passage 30. Therefore, the rotating electric machine 1 of this embodiment can circulate the oil 6 in the oil flow passage 30 without providing a separate oil supply pump, thereby improving the cooling performance of the magnet 20 while suppressing cost increases. Here, the oil reservoir 5 can be a case that houses the oil reservoir 5 or the rotating electric machine 1 (for example, a transaxle housing case).

[0050] (e) The rotating electric machine 1 of this embodiment described above is characterized in that the supply fan 40 is a turbo fan.

[0051] As described above, the rotating electric machine 1 of this embodiment, when configured as shown in (e), can improve the suction force of the oil 6, thereby ensuring that the oil 6 is reliably delivered to the oil flow passage 30. Furthermore, by repurposing, for example, a turbo fan prepared for the production of turbo vehicles, it is expected that the development and production costs of the turbo fan can be reduced.

[0052] (f) The rotating electric machine 1 of this embodiment described above is characterized in that the supply fan 40 and the discharge fan 50 are turbo fans.

[0053] The rotating electric machine 1 of this embodiment, as described above, can be configured as shown in (f) above to improve the suction force of the oil 6, thereby ensuring that the oil 6 is reliably delivered to the oil flow passage 30. Furthermore, by repurposing, for example, a turbo fan prepared for the production of turbo vehicles, it is expected that the development and production costs of the turbo fan can be reduced.

[0054] (g) The rotating electric machine 1 of this embodiment described above is characterized in that the magnet 20 is a heavy rare earth-free neodymium magnet that does not contain heavy rare earth elements.

[0055] The rotating electric machine 1 of this embodiment described above can be configured as shown in (g) above to reduce the cost of the magnet 20.

[0056] (h) In the rotating electric machine 1 of this embodiment described above, the fixed part 25 is characterized in that the outer side along the axial direction of the magnet 20 is covered with a covering member 26, and a part of the covering member 26 along the axial direction of the magnet 20 is cut out from one end to the other end in the axial direction of the magnet 20.

[0057] The rotating electric machine 1 of this embodiment, as described above, can be configured as shown in (h) above, thereby ensuring that the magnet 20 is fixed to the rotor core 10 while forming an oil flow passage 30 in the fixing part 25. Therefore, the rotating electric machine 1 of this embodiment can suppress cost increases and make the rotating electric machine 1 more compact compared to the case in which an oil flow passage 30 is provided separately.

[0058] The above describes the configuration and effects of the rotating electric machine 1 of the present invention. However, the rotating electric machine 1 of the present invention is not limited to the embodiments and modifications described above, and various modifications can be made within the scope of the present invention. For example, the rotating electric machine 1 may be as described in (a) above, and can be formed in various shapes and sizes. Furthermore, the rotating electric machine 1 of the present invention may, for example, not have some or all of the configurations related to (b) to (h) above, or may have some or all of (b) to (h) above and other configurations.

[0059] In this embodiment, the example of the rotating electric machine 1 being used in an electric vehicle (battery EV) or a hybrid vehicle (HV) is illustrated, but the rotating electric machine 1 of the present invention can be used not only in motors and generators for electric vehicles and hybrid vehicles, but also in motors and generators for various other vehicles. Furthermore, the shape and size of the shaft 11, magnets 20, rotor core 10, coil 3, and stator core 2 can be varied. In this embodiment, 16 magnets 20 are arranged in the circumferential direction of the rotor core 10, but the magnets 20 can be arranged in various numbers and configurations. For example, multiple magnets 20 may be arranged along the axial direction of the shaft 11. In addition, the magnets 20 may be not only heavy rare earth-free neodymium magnets, but also neodymium magnets with added heavy rare earth elements, or magnets with compositions other than neodymium magnets.

[0060] In this embodiment, the fixing portion 25 of the magnet 20 is made of molded resin as a covering member 26, but the fixing portion 25 can be made of various materials and shapes, not just molded resin. Also, in this embodiment, the fixing portion 25 is provided on the magnet 20 side, but the fixing portion 25 may also be provided on the rotor core 10 side. Also, in this embodiment, the fixing portion 25 is configured as described in (h) above, but the covering member 26 of the fixing portion 25 can be formed into various shapes. Also, the notched portion of the covering member 26 of the fixing portion 25 can be formed into various shapes and sizes that communicate from one end to the other in the axial direction of the magnet 20. For example, the oil flow passage 30 may be formed in a bent or curved shape. Also, the oil flow passage 30 may be formed in a bellows shape or meandering shape. In such a configuration, a wide flow area of ​​the oil flow passage 30 can be secured. Also, if you want to allow the oil 6 to flow smoothly, it is good to form the oil flow passage 30 in a straight line as in this embodiment.

[0061] Furthermore, the oil 6 circulating in the oil passage 30 may be not only automatic transmission fluid (ATF), but also various other oils (including fluids) such as continuously variable transmission fluid (CVTF) or engine oil. In such cases, it is preferable to use an oil with good heat exchange properties or an oil used in the location where the rotating electric machine 1 is installed (for example, the transmission). Also, the oil 6 is not limited to oils and greases, but may also be a heat exchange medium such as water or a water-soluble coolant.

[0062] Furthermore, in this embodiment, the supply fan 40 and the discharge fan 50 are both turbo fans, but the rotating electric machine 1 of the present invention is not limited to this, and various types of fans (including blowers and impellers) can be used. For example, the supply fan 40 may be a screw fan, an impeller for a supply pump, etc. Also, in this embodiment, the supply fan 40 and the discharge fan 50 are both turbo fans of the same type, but the supply fan 40 and the discharge fan 50 may be composed of different types of fans. It is also possible to have a configuration in which only one of the supply fan 40 or the discharge fan 50 is provided. If only the discharge fan 50 is provided, it is preferable to use the discharge fan 50 to create negative pressure in the oil flow passage 30, thereby drawing (circulating) the oil 6 into the oil flow passage 30.

[0063] In this embodiment, a through-hole 41 is provided in the supply fan 40 at a position facing the coil 3. However, the through-hole 41 may be provided only if necessary, and the rotating electric machine 1 of the present invention can also be configured without a through-hole 41. Furthermore, when a through-hole 41 is provided, it can be positioned at various locations that allow oil 6 to be supplied toward the coil 3. In addition, the through-hole 41 can be formed in various shapes and sizes.

[0064] Furthermore, in this embodiment, the oil reservoir 5 also serves as the transaxle housing case 4, but the oil reservoir 5 is not limited to this and may be provided independently. If the oil reservoir 5 is provided independently, it is preferable to position it so that at least the supply fan 40 is immersed in the oil 6. In addition, various other materials such as cases other than the transaxle or oil pans can be used for the oil reservoir 5.

[0065] The above describes various embodiments and modifications of the rotating electric machine according to the present invention. However, the present invention is not limited to those exemplified in the embodiments and modifications described above, and it will be readily apparent to those skilled in the art that other embodiments may exist in the spirit and nature of the teachings, without departing from the scope of the claims. [Industrial applicability]

[0066] The present invention can be suitably used in rotating electric machines (motors) such as motors and generators in electric vehicles (battery EVs) and hybrid vehicles. [Explanation of Symbols]

[0067] 1: Rotating electric machine 2: Stator core 3: Stator coil (coil) 5: Oil reservoir (oil pan) 6: Oil 10: Rotor core 11: Shaft 20: Magnets (permanent magnets) 21: Corner 25:Fixed part 26: Covering member 30: Oil flow passage 40: Supply fan (primary fan, upstream fan) 41: Through hole 50: Exhaust fan (secondary fan, downstream fan)

Claims

1. A rotor core supported by a shaft, with multiple magnets fixed in the circumferential direction, A stator core into which a coil is inserted, A rotating electric machine equipped with, The rotor core has an oil passage formed therein, by connecting at least a portion of the fixing part that secures the magnet in the axial direction of the shaft, to an oil passage through which oil can be circulated. The shaft has a supply fan provided on one end that is on the supply side of the oil flow passage. A rotating electric machine characterized in that the supply fan rotates integrally with the shaft and delivers the oil into the oil passage.

2. The shaft has a discharge fan on the other end, which is the side where the oil is discharged in the oil passage. The rotating electric machine according to claim 1, characterized in that the discharge fan rotates integrally with the shaft and discharges the oil from the oil passage.

3. The supply fan has a through hole provided at a position opposite to the coil, The rotating electric machine according to claim 1 or 2, characterized in that the through hole allows the oil sucked up by the supply fan to be discharged toward the coil.

4. An oil storage section for storing the aforementioned oil is provided. At least a portion of the stator core and the rotor core are immersed in the oil stored in the oil reservoir. The rotating electric machine according to claim 1 or 2, characterized in that the supply fan, as it rotates, scoops up the oil stored in the oil reservoir and sends the scooped-up oil into the oil flow passage.

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