Motor and aircraft

Abstract

A motor and an aircraft are provided. The motor includes a rotor and a stator. The rotor is rotatable about a central shaft extending in an axial direction. The stator has a ring-shaped stator core surrounding the central shaft. The rotor has a cylindrical portion, a first plate portion, a second plate portion, and a hole portion. The cylindrical portion is disposed at a position radially outward of the stator and extends in the axial direction. The first plate portion is disposed at a position axially on one side of the stator and extends radially inward from an axial one end portion of the cylindrical portion. The second plate portion is disposed at a position axially on the other side of the stator and extends radially inward from an axial other end portion of the cylindrical portion. The hole portion penetrates at least any one of the cylindrical portion, the first plate portion, and the second plate portion.

Description

Technical Field

[0001] This invention relates to motors and aircraft. Background Technology

[0002] Previously, techniques for dissipating heat from a motor by providing holes in the cover of the rotating body were known. For example, the rotor is rotatably connected to a base on which the stator is fixed. By providing holes in the cover provided on the rotor, airflow inside the motor is facilitated (see, for example, Chinese Utility Model No. 205602145).

[0003] Existing technical documents

[0004] Patent Document 1: Chinese Utility Model No. 205602145 Specification

[0005] However, in existing motors, because the base does not rotate, air may not circulate sufficiently on the stationary side of the stator. Therefore, it may not be possible to adequately dissipate heat from inside the motor. Summary of the Invention

[0006] The purpose of this invention is to improve the heat dissipation performance of motors.

[0007] An exemplary motor of the present invention includes a rotor and a stator. The rotor is rotatable about a central axis extending in an axial direction. The stator has an annular stator core surrounding the central axis. The rotor has a cylindrical portion, a first plate portion, a second plate portion, and a bore portion. The cylindrical portion is disposed radially outward from the stator and extends axially. The first plate portion is disposed axially to one side of the stator and extends radially inward from one axial end of the cylindrical portion. The second plate portion is disposed axially to the other side of the stator and extends radially inward from the other axial end of the cylindrical portion. The bore portion penetrates at least one of the cylindrical portion, the first plate portion, and the second plate portion.

[0008] An exemplary aircraft of the present invention includes the motor described above.

[0009] The effects of this invention are as follows.

[0010] The exemplary motor and aircraft according to the present invention can improve the heat dissipation performance of the motor. Attached Figure Description

[0011] Figure 1 This is a cross-sectional view showing a structural example of the motor according to the first embodiment.

[0012] Figure 2 This is a perspective view showing the appearance of the motor according to the first embodiment.

[0013] Figure 3This is a diagram showing an example of an aircraft equipped with a motor.

[0014] Figure 4A This is a cross-sectional view showing an example of the configuration of the bore on the axial side of the rotor.

[0015] Figure 4B This is a cross-sectional view showing an example of the configuration of the bore on the other side of the rotor's axial direction.

[0016] Figure 5A This is a perspective view showing an example of the structure of the first groove.

[0017] Figure 5B This is a perspective view showing an example of the structure of the second groove.

[0018] Figure 6 This is a cross-sectional view showing a structural example of a motor according to a variation of the first embodiment.

[0019] Figure 7 This is a perspective view showing the appearance of a motor in a modified example of the first embodiment.

[0020] Figure 8 This is a cross-sectional view showing an example of the structure of the stator cage as viewed from the axial direction.

[0021] Figure 9 This is a cross-sectional view showing a structural example of the motor according to the second embodiment.

[0022] Figure 10 This is a perspective view showing the appearance of the motor according to the second embodiment.

[0023] Figure 11 This is a perspective view showing the end of the motor on the other side of the axial direction according to the second embodiment.

[0024] Figure 12 This is a cross-sectional view showing a structural example of a motor according to a modified example of the second embodiment.

[0025] Figure 13 This is a perspective view showing the appearance of the motor in a modified example of the second embodiment.

[0026] In the diagram: 100—Motor, 101—First Space, 102—Second Space, 1—Rotor, 10—Shaft, 11—Rotor Hub, 111—Inclined Surface, 12—Cylinder, 121—First Cylinder, 1211—Recess, 122—Second Cylinder, 1221—Recess, 13—Plate, 131—First Plate, 1311—Disc, 1312—Rotor Rib, 132—Second Plate, 141—Rotor Core, 1410—Iron Chip, 1411—Protrusion, 142—Magnet, 15—Hole, 150—Rotor Hole, 151—First Rotor Hole, 152—Second Rotor Hole, 153—Side Hole, 1531—First Side Hole, 1532—Second Side Hole, 160—Wall, 161—First Groove, 162—Second Groove, 1610— First wall surface, 1620—Second wall surface, 1611, 1621—Outer wall surface, 1612, 1622—Inner wall surface, 1613, 1623—Bottom surface, 17—Rotor cover, 2—Stator, 21—Stator core, 22—Coil section, 221—Coil head, 23—Insulator, 3—Stator cage, 30—Bearing, 31—Cage platform, 311—Inner cylinder section, 312—Outer cylinder section, 313—Connecting part, 32—Cage cylinder section, 33—Protrusion section, 34—Cage through hole, 4—Base section, 41—Base section recess, 42—Cage opening, 500—Aircraft, 501—Battery, 502—Propeller, CX—Central shaft, Da1—One axial direction, Da2—The other axial direction, Dr1—One circumferential direction, Dr2—The other circumferential direction. Detailed Implementation

[0027] Exemplary embodiments will now be described with reference to the accompanying drawings.

[0028] It should be noted that, in this specification, in the motor 100, the direction parallel to the central axis CX is referred to as the "axial direction". Furthermore, the direction orthogonal to a predetermined axis such as the central axis CX is referred to as the "radial direction", and the direction of rotation centered on the predetermined axis is referred to as the "circumferential direction". Additionally, the direction closer to the predetermined axis within the radial direction is referred to as the "radial inner direction", and the direction farther from the predetermined axis is referred to as the "radial outer direction".

[0029] In addition, in this specification, "ring-shaped" includes not only shapes that are seamlessly and continuously connected in the entire circumferential region centered on the central axis CX, but also shapes that have one or more gaps in a portion of the entire region centered on the central axis CX. Furthermore, it also includes shapes in which a closed curve is drawn on a surface intersecting the central axis CX.

[0030] Furthermore, in the positional relationship between any of the orientations, lines, and planes and any other of the other, "parallel" includes not only a state where they never intersect regardless of where they extend, but also a state where they are approximately parallel. Similarly, "perpendicular" and "orthogonal" include not only a state where they intersect at 90 degrees, but also a state where they are approximately perpendicular and a state where they are approximately orthogonal, respectively. In other words, "parallel," "perpendicular," and "orthogonal" each include a state where there is an angular offset in the positional relationship between the two without departing from the spirit of the invention.

[0031] Furthermore, these names are used merely for illustrative purposes and are not intended to define actual positional relationships, directions, or names.

[0032] <1. First Implementation>

[0033] Figure 1 This is a cross-sectional view showing a structural example of the motor 100 according to the first embodiment. Figure 2 This is a perspective view showing the appearance of the motor 100 according to the first embodiment. Figure 3 This is an illustration of an example of an aircraft 500 equipped with a motor 100. Additionally, Figure 2 The cross-sectional structure of the motor 100 is shown when cut with an imaginary plane containing the central axis CX.

[0034] like Figure 3 As shown, the aircraft 500 includes a motor 100. Additionally, the aircraft 500 also includes a battery 501 and a propeller 503. The motor 100 is the drive source for the aircraft 500, such as a drone. For example, the motor 100 receives power from the battery 501 and rotates to drive the propeller 501. Figure 3 In the aircraft 500, as described later, the heat dissipation performance of the motor 100 can be improved. Furthermore, the application of the motor 100 is not limited to… Figure 3 Examples.

[0035] like Figure 1 and Figure 2 As shown, the motor 100 includes a rotor 1, a stator 2, a stator cage 3, and a base 4.

[0036] <1-1. Rotor 1>

[0037] The rotor 1 is capable of rotating about a central axis CX extending in the axial direction. As described above, the motor 100 includes a rotor 1. The rotor 1 has a cylindrical shaft 10, a rotor hub 11, a cylindrical portion 12, a first plate portion 131, a second plate portion 132, a rotor core 141, a magnet 142, a hole portion 15, a first slot portion 161, and a second slot portion 162. In addition, the first plate portion 131 and the second plate portion 132 are sometimes collectively referred to as "plate portion 13" below.

[0038] <1-1-1. Axis 10>

[0039] Shaft 10 extends along the central axis CX along the axial direction.

[0040] <1-1-2. Rotor Hub 11>

[0041] The rotor hub 11 is an annular ring surrounding the central shaft CX and is fixed to the radial outer side of the shaft 10.

[0042] <1-1-3. Cylindrical Part 12>

[0043] The cylindrical portion 12 is positioned radially outward from the stator 2 and extends axially. As described above, the rotor 1 has the cylindrical portion 12. The cylindrical portion 12 has a first cylindrical portion 121 and a second cylindrical portion 122. The first cylindrical portion 121 and the second cylindrical portion 122 are cylindrical in shape surrounding the central shaft CX and extend axially.

[0044] The first cylindrical portion 121 has a plurality of recesses 1211 arranged in the circumferential direction. Each recess 1211 is recessed from the end of the first cylindrical portion 121 on the opposite side of the axial direction Da2 toward the side of the axial direction Da1 and penetrates the first cylindrical portion 121 in the radial direction.

[0045] The second cylindrical portion 122 is positioned on the axially opposite side (Da2) of the first cylindrical portion 121, and in this embodiment, it is arranged with a gap in the axial direction from the first cylindrical portion 121. The second cylindrical portion 122 has a plurality of recesses 1221 arranged in the circumferential direction. Each recess 1221 is recessed from the end of the second cylindrical portion 122 on the axially opposite side (Da1) towards the axially opposite side (Da2), and penetrates the second cylindrical portion 122 radially.

[0046] <1-1-4. First section 131>

[0047] The first plate portion 131 is positioned on the axial side (Da1) of the stator 2, extending radially inward from the end of the cylinder portion 12 on the axial side (Da1). As described above, the rotor 1 has the first plate portion 131. The first plate portion 131 is axially opposed to the stator 2. The radially outer end of the first plate portion 131 is connected to the first cylinder portion 121. The radially inner end of the first plate portion 131 is connected to the radially outer end of the rotor hub 11.

[0048] <1-1-5. Second section 132>

[0049] The second plate portion 132 is positioned on the opposite side (Da2) of the stator 2 in the axial direction, extending radially inward from the end of the cylinder portion 12 on the opposite side (Da2). As described above, the rotor 1 has the second plate portion 132. The second plate portion 132 is axially opposed to the stator 2. The radially outer end of the second plate portion 132 is connected to the second cylinder portion 122. The radially inner end of the second plate portion 132 is radially opposed to the stator cage 3 with a gap.

[0050] The rotor 1 has both a first plate portion 131 and a second plate portion 132, thereby allowing air circulation in the first space 101 through the rotation of the first plate portion 131 when the rotor 1 rotates. Furthermore, air circulation in the second space 102 is achieved through the rotation of the second plate portion 132. The first space 101 is the space between the first plate portion 131 and one axial end of the stator 2 on the Da1 side. The second space 102 is the space between the second plate portion 132 and the other axial end of the stator 2 on the Da2 side. Therefore, heat dissipation at both axial ends of the stator 2 is promoted, suppressing temperature rise. Thus, the heat dissipation performance of the motor 100 is improved.

[0051] <1-1-6. Rotor core 141 and magnet 142>

[0052] The rotor core 141 is a cylindrical shape surrounding the central shaft CX and is disposed on the radially inner side of the cylindrical portion 12. The rotor core 141 is a magnetic material, and in this embodiment, it is, for example, a stack of electromagnetic steel plates stacked axially. The end of the rotor core 141 on one axial side (Da1) is connected to the radially inner side of the first cylindrical portion 121. The end of the rotor core 141 on the other axial side (Da2) is connected to the radially inner side of the second cylindrical portion 122. The first cylindrical portion 121 is connected to the second cylindrical portion 122 with a gap in the axial direction via the rotor core 141. Since the volume of the cylindrical portion 12 can be reduced, it is possible to contribute to the weight reduction of the motor 100 (especially the rotor 1).

[0053] The rotor core 141 has a plurality of protrusions 1411 arranged circumferentially. The protrusions 1411 protrude radially outward from the radially outer side of the rotor core 141 and extend axially. The end of the protrusion 1411 on one axial side (Da1) is inserted into a recess 1211 of the first cylindrical portion 121. The end of the protrusion 1411 on the other axial side (Da2) is inserted into a recess 1221 of the second cylindrical portion 122. These fitting structures reliably prevent rotation of the rotor core 141 and the magnet 142 relative to the cylindrical portion 12 in the circumferential direction. Furthermore, when assembling the rotor 1, the circumferential position of the portion of the rotor 1 including the second cylindrical portion 122 and the second plate portion 132 on the other axial side (Da2) can be easily determined relative to the portion of the rotor 1 including the first cylindrical portion 121 and the first plate portion 131 on one axial side (Da1).

[0054] Magnet 142 is disposed on the radially inner surface of rotor core 141, and is radially opposed to stator 2. In magnet 142, different magnetic poles (i.e., N pole and S pole) are arranged alternately in the circumferential direction. Magnet 142 can be a ring-shaped component surrounding the central axis CX, or it can be composed of multiple magnetic pole pieces arranged in the circumferential direction.

[0055] <1-1-7. Hole 15>

[0056] The hole 15 penetrates at least one of the cylindrical portion 12, the first plate portion 131, and the second plate portion 132. As described above, the rotor 1 has the hole 15. By having the hole 15, the rotor 1 functions as an intake or exhaust port when the rotor 1 rotates, enabling airflow between the rotor 1 and the stator 2. Therefore, the heat dissipation performance of the stator 2, especially its coil portion 22, can be improved. Therefore, the heat dissipation performance of the motor 100 can be improved.

[0057] Preferably, the hole 15 includes at least one of a first rotor hole 151 and a second rotor hole 152. The first rotor hole 151 extends axially through the first plate portion 131. The second rotor hole 152 extends axially through the second plate portion 132. In this embodiment, the hole 15 includes a first rotor hole 151 and a second rotor hole 152.

[0058] By providing a first rotor hole 151 on the first plate portion 131, air can flow from the outside of the rotor 1 into the first space 101 between the first plate portion 131 and the end of the stator 2 on one axial side (Da1 side) when the rotor 1 rotates. Alternatively, air circulating in the first space 101 can be discharged to the outside of the rotor 1. Therefore, the end of the stator 2 on one axial side (Da1 side), especially the coil head 221 on the one axial side (Da1 side), can dissipate heat, and its temperature rise can be suppressed. In addition, the coil head 221 is the portion axially outer of the stator core 21 of the coil portion 22 of the stator 2, for example, including a portion axially outer of the stator core 21 of the coil portion 22 on one axial side (Da1 side) and a portion axially outer of the stator core 21 of the coil portion 22 on the other axial side (Da2 side).

[0059] Furthermore, by arranging the second rotor hole 152 in the second plate portion 132, air can flow from the outside of the rotor 1 into the second space 102 between the second plate portion 132 and the end of the stator 2 on the other axial side (Da2 side) when the rotor 1 rotates. Alternatively, air circulating in the second space 102 can be discharged to the outside of the rotor 1. Therefore, heat can be dissipated from the end of the stator 2 on the other axial side (Da2 side), especially the coil head 221 on the other axial side (Da2 side), and its temperature rise can be suppressed.

[0060] More preferably, such as Figure 1As shown, the bore 15 includes both a first rotor bore 151 and a second rotor bore 152. Thus, one of these can function as an intake port and the other as an exhaust port. Furthermore, these functions vary depending on the rotation direction of the rotor 1. For example, when the rotor 1 rotates in the circumferential direction, the first rotor bore 151 becomes the intake port and the second rotor bore 152 becomes the exhaust port. Conversely, when the rotor 1 rotates in the reverse circumferential direction, the first rotor bore 151 becomes the exhaust port and the second rotor bore 152 becomes the intake port. Therefore, regardless of the rotation direction of the rotor 1, the motor 100 can reliably perform both intake and exhaust to the outside of the rotor 1, thereby improving the air exchange efficiency between the rotor 1 and the stator 2.

[0061] Furthermore, preferably, when viewed axially, at least one rotor bore 150 overlaps with the coil portion 22. For example, in Figure 1 In this example, viewed axially, at least a portion of the first rotor bore 151 overlaps with the coil head 221 on the axial side Da1 of the coil portion 22. Furthermore, viewed axially, at least a portion of the second rotor bore 152 overlaps with the coil head 221 on the axial side Da2 of the coil portion 22. This allows the motor 100 to directly contact the coil portion 22 with air flowing in from outside the rotor 1. Additionally, the motor 100 can efficiently exhaust air near the coil portion 22 to the outside of the rotor 1. Therefore, the heat dissipation efficiency of the coil portion 22 can be improved. However, this example does not preclude structures where the first rotor bore 151 and the second rotor bore 152 do not overlap with the coil portion 22 when viewed axially.

[0062] In addition, Figure 1 and Figure 2 In this case, the cylindrical portion 12 does not have a hole 15. However, it is not limited to this. Figure 1 and Figure 2 For example, the bore 15 can also be configured on the cylindrical part 12. Figure 4A This is a cross-sectional view showing an example of the configuration of the hole 15 on one side (Da1) of the rotor 1 along its axial direction. Figure 4B This is a cross-sectional view showing an example of the configuration of the bore 15 on the Da2 side of the rotor 1, on the opposite side of the axial direction. For example, as shown... Figure 4A and Figure 4B As shown, the bore 15 may also include a side bore 153 that radially penetrates the cylindrical portion 12. In other words, the rotor 1 may also have a side bore 153 that radially penetrates the cylindrical portion 12. Figure 4A In the middle, the side hole portion 153 includes a first side hole portion 1531 that radially penetrates the first cylindrical portion 121. Additionally, in Figure 4BIn this configuration, the side hole portion 153 includes a second side hole portion 1532 that radially penetrates the second cylindrical portion 122. The side hole portion 153 may include both the first side hole portion 1531 and the second side hole portion 1532, or it may include only one of the first side hole portion 1531 and the second side hole portion 1532. In this case, it is preferable that at least one of the rotor hole portions 150 is positioned radially inward compared to the cylindrical portion 12.

[0063] In this way, the motor 100, through the rotation of the rotor 1, can draw air from the outside of the rotor 1 using the first rotor hole 151 and / or the second rotor hole 152, and can efficiently discharge air that has been cooled from the stator 2 using the side hole 153. Since air flows smoothly from the first rotor hole 151 and / or the second rotor hole 152 to the side hole 153, the motor 100 can efficiently exchange air between the rotor 1 and the stator 2. Furthermore, the exhaust from the side hole 153 prevents water or dust from entering the interior of the rotor 1. However, when the hole 15 includes the side hole 153, Figure 4A and Figure 4B The example does not exclude a structure in which at least one of the rotor bore portions 150 is not configured in a position that is radially inward than the cylindrical portion 12.

[0064] Preferably, at least a portion of the side hole 153 is axially positioned on the rotor hole 150 side, which is closer to at least one side of the stator 2. This allows the motor 100 to more efficiently exchange air between the rotor 1 and the stator 2.

[0065] For example, when the first rotor hole 151 is disposed on the first plate portion 131, it is preferable to... Figure 4A As shown, at least a portion of the first side hole 1531 is disposed on the portion of the first cylindrical portion 121 that is axially closer to the stator 2 on the Da1 side. More preferably, the entire first side hole 1531 is disposed on the portion of the first cylindrical portion 121 that is axially closer to the stator 2 on the Da1 side. As a result, air can flow smoothly from the first rotor hole 151 toward the first side hole 1531.

[0066] Furthermore, when the second rotor hole portion 152 is disposed on the second plate portion 132, it is preferable to... Figure 4B As shown, at least a portion of the second side hole 1532 is disposed on the portion of the second cylinder 122 that is axially opposite to the stator 2 on the Da2 side. More preferably, the entire second side hole 1532 is disposed on the portion of the second cylinder 122 that is axially opposite to the stator 2 on the Da2 side. This allows air to flow smoothly from the second rotor hole 152 toward the second side hole 1532.

[0067] in addition, Figures 1 to 4BThe examples do not exclude structures where the bore 15 does not include the rotor bore 150, nor do they exclude structures where the bore 15 does not include the side bore 153. That is, the bore 15 only needs to include at least one of the first rotor bore 151, the second rotor bore 152, and the side bore 153.

[0068] <1-1-8. First groove 161 and second groove 162>

[0069] Next, refer to Figure 5A and Figure 5B The first groove 161 and the second groove 162 will be described. Figure 5A This is a perspective view showing a structural example of the first groove 161. Figure 5B This is a perspective view showing a structural example of the second groove 162. Figure 5A In the image, the first cylindrical portion 121 and the first plate portion 131 are viewed from the opposite axial direction Da2 toward the axial direction Da1. On the other hand, in... Figure 5B In this view, the second cylindrical portion 122 and the second plate portion 132 are observed from one axial direction (Da1) towards the other axial direction (Da2). Therefore, Figure 5B The axial side Da1 and the axial side Da2, and the circumferential side Dr1 and the circumferential side Dr2, respectively, are respectively with Figure 5A on the contrary.

[0070] The rotor 1 has a plurality of first grooves 161 arranged circumferentially and a plurality of second grooves 162 arranged circumferentially. However, it is not limited to this example; at least one of the number of first grooves 161 and the number of second grooves 162 may be present. The first grooves 161 are disposed on the end face of the first plate portion 131 on the opposite axial side (Da2), and are recessed towards the opposite axial side (Da1). The first grooves 161 extend at least radially inward and are connected to the first rotor bore portion 151. The second grooves 162 are disposed on the end face of the second plate portion 132 on the opposite axial side (Da1), and are recessed towards the opposite axial side (Da2). The second grooves 162 extend at least radially inward and are connected to the second rotor bore portion 152.

[0071] In this embodiment, the first groove 161 and the second groove 162 extend in a spiral shape from the radially outer side to the radially inner side. Furthermore, the first groove 161 and the second groove 162 are spirals that coil in opposite directions. For example... Figure 5A As shown, the first slot 161 further extends circumferentially toward the Dr1 side and extends radially inward toward the Dr1 side. The radially inward end of the first slot 161 on the Dr1 side is connected to the first rotor slot 171. Additionally, as... Figure 5BAs shown, the second groove 162 extends further circumferentially toward the Dr2 side and radially inward toward the Dr2 side. The radially inward end of the second groove 162 on the Dr2 side connects to the second rotor groove 172. However, it is not limited to... Figure 5A and Figure 5B For example, the first groove 161 and the second groove 162 may also be spirals that spiral in the same direction. Alternatively, at least one of the first groove 161 and the second groove 162 may not be spiral as described above, for example, it may extend radially from the radially outer side toward the radially inner side of the rotor hole 150.

[0072] <1-1-8-1. Structure of the first groove 161>

[0073] The first groove portion 161 has a first wall surface 1610 facing circumferentially. The first wall surface 1610 is disposed at the end of the first plate portion 131 on the other side of the axial direction Da2 and extends at least radially. The first wall surface 1610 is connected to the first rotor hole portion 151 and is inclined towards the circumferential direction Dr1 as it moves radially inward.

[0074] The first wall surface 1610 has an outer wall surface 1611 and an inner wall surface 1612. The outer wall surface 1611 and the inner wall surface 1612 are opposed to each other in the circumferential direction, and in this embodiment, they are also opposed to each other in the radial direction. The outer wall surface 1611 and the inner wall surface 1612 extend at least in the axial and radial directions. The outer wall surface 1611 is at least circumferentially opposite to Dr2, and in this embodiment, it is further radially inward. The inner wall surface 1612 is positioned further circumferentially opposite to Dr2 than the outer wall surface 1611, and in this embodiment, it is further radially inward than the outer wall surface 1611. The inner wall surface 1612 is at least circumferentially opposite to Dr1, and in this embodiment, it is further radially outward.

[0075] In addition, the first groove 161 also has a bottom surface 1613 facing the opposite side Da2 in the axial direction. Viewed in the axial direction, the bottom surface 1613 is disposed between the outer wall surface 1611 and the inner wall surface 1612, and extends at least in the radial direction.

[0076] In this embodiment, the outer wall surface 1611, the inner wall surface 1612, and the bottom surface 1613 further extend circumferentially and extend towards the circumferential Dr1 side as they move radially inward. The radially inward and circumferentially Dr1 side end of the outer wall surface 1611 is connected to the radially outer end of the first rotor hole portion 151. The radially inward and circumferentially Dr1 side end of the inner wall surface 1612 is connected to the radially inward end of the first rotor hole portion 151. The radially inward and circumferentially Dr1 side end of the bottom surface 1613 is connected to the circumferentially Dr2 side end of the first rotor hole portion 151.

[0077] Preferably, the bottom surface 1613 extends axially toward the Da1 side from its circumferentially opposite Dr2 side end toward the first rotor hole 151. More preferably, the circumferentially Dr1 side and radially inward end of the bottom surface 1613 is connected to the axial Da1 side end of the first rotor hole 151. In this way, air flowing in from the first rotor hole 151 can flow smoothly along the bottom surface 1613. Alternatively, air flowing near the bottom surface 1613 can flow smoothly toward the first rotor hole 151 through the bottom surface 1613 and out of the first rotor hole 151. Therefore, turbulence at the first rotor hole 151 and the first groove 161 can be suppressed.

[0078] <1-1-8-2. Structure of the second groove 162>

[0079] The second groove portion 162 has a second wall surface 1620 facing circumferentially. The second wall surface 1620 is disposed at the end of the second plate portion 132 on one side of the axial direction Da1 and extends at least radially. The second wall surface 1620 is connected to the second rotor hole portion 152 and is inclined to the other side of the circumferential direction Dr2 as it moves radially inward.

[0080] The second wall surface 1620 has an outer wall surface 1621 and an inner wall surface 1622. The outer wall surface 1621 and the inner wall surface 1622 are opposed to each other circumferentially, and in this embodiment, also opposed to each other radially. The outer wall surface 1621 and the inner wall surface 1622 extend at least axially and radially. The outer wall surface 1621 faces at least towards the circumferential side Dr1, and in this embodiment, further towards the radially inward side. The inner wall surface 1622 is positioned closer to the circumferential side Dr1 than the outer wall surface 1621, and in this embodiment, further towards the radially inward side than the outer wall surface 1621. The inner wall surface 1622 faces at least towards the other circumferential side Dr2, and in this embodiment, further towards the radially outward side.

[0081] In addition, the second groove 162 also has a bottom surface 1623 facing the axial side Da1. Viewed axially, the bottom surface 1623 is disposed between the outer wall surface 1621 and the inner wall surface 1622, and extends at least in the radial direction.

[0082] In this embodiment, the outer wall surface 1621, the inner wall surface 1622, and the bottom surface 1623 further extend circumferentially and extend radially inward towards the opposite Dr2 side. The radially inward end of the outer wall surface 1621, circumferentially towards the opposite Dr2 side, is connected to the radially outer end of the second rotor hole 152. The radially inward end of the inner wall surface 1622, circumferentially towards the opposite Dr2 side, is connected to the radially inward end of the second rotor hole 152. The radially inward end of the bottom surface 1623, circumferentially towards the opposite Dr2 side, is connected to the circumferentially towards the opposite Dr1 side end of the second rotor hole 152.

[0083] Preferably, the bottom surface 1623 extends axially towards the second rotor bore 152 from its circumferential Dr1 side end toward the second rotor bore 152. More preferably, the circumferentially Dr2 side and radially inward end of the bottom surface 1623 is connected to the axially Da2 side end of the second rotor bore 152. In this way, air flowing in from the second rotor bore 152 can flow smoothly along the bottom surface 1623. Alternatively, air flowing near the bottom surface 1623 can flow smoothly towards the second rotor bore 152 and out of the second rotor bore 152. Therefore, turbulence at the second rotor bore 152 and the second groove 162 can be suppressed.

[0084] <1-1-8-3. Summary of the Structure>

[0085] In this embodiment, the rotor 1 has both a first groove 161 and a second groove 162. However, it is not limited to this example, and the rotor 1 may also have only one of the first groove 161 and the second groove 162. Alternatively, a pair of first ribs with a first wall surface 1610 may be formed on the rotor 1 instead of at least a portion of the first groove 161. In this case, viewed axially, the pair of first ribs are arranged in the same spiral or radial shape as the first groove 161, protruding from the end face of the first plate portion 131 on the axial side Da2 to the axial side Da2. Alternatively, a pair of second ribs with a second wall surface 1620 may be formed instead of at least a portion of the second groove 162. In this case, the pair of second ribs are arranged in the same spiral or radial shape as the second groove 162, protruding from the end face of the second plate portion 132 on the axial side Da1 to the axial side Da1.

[0086] That is, the rotor 1 only needs to have at least one of the first wall surface 1610 and the second wall surface 1620. In other words, at least one of the first plate portion 13 and the second plate portion 132 only needs to have a wall surface 160 facing circumferentially. In addition, "wall surface 160" is a general term for the first wall surface 1610 and the second wall surface 1620. The wall surface 160 is disposed at the end of the stator 2 side of the axial direction of the aforementioned at least one plate portion 13, extends at least in the radial direction, and is connected to at least one rotor bore portion 150. In this way, air between the plate portion 13 and the stator 2 can flow along the wall surface 160. Therefore, air flowing in from the rotor bore portion 150, which functions as an intake port, can flow smoothly along the wall surface 160, thereby suppressing or preventing turbulence between the plate portion 13 and the stator 2. Alternatively, air flowing along the wall surface 160 can be smoothly discharged from the rotor bore portion 150, which functions as an exhaust port.

[0087] More preferably, the rotor 1 has both a first wall surface 1610 and a second wall surface 1620. In other words, the aforementioned wall surface 160 includes both the first wall surface 1610 and the second wall surface 1620. By including both the first wall surface 1610 and the second wall surface 1620, air can be smoothly drawn in from the outside of the rotor 1 using one of the first wall surface 1610 and the second wall surface 1620, and air can be smoothly discharged from the outside of the rotor 1 using the other. Therefore, the motor 100 can suppress or prevent turbulence between the first plate portion 131 and the second plate portion 132 and the stator 2 regardless of the rotation direction of the rotor 1, and can smoothly discharge the air flowing along the wall surface 160 from the rotor hole portion 150, which functions as an exhaust port.

[0088] The aforementioned wall surface 160 is inclined circumferentially outward towards the radial direction. Thus, when viewed axially, the wall surface 160 can be formed into a shape that expands spirally relative to the central axis CX. Therefore, relative to the rotor bore 150, air can flow smoothly circumferentially along the wall surface 160.

[0089] Furthermore, at least one plate portion 13 of rotor 1 may have at least one bottom surface, either bottom surface 1613 or bottom surface 1623. This bottom surface is disposed at the end of at least one plate portion 13 on the stator 2 side in the axial direction, extends circumferentially from the wall surface 160, and connects to at least one rotor bore portion 150. This bottom surface is inclined axially toward the side opposite to the stator 2 as it approaches at least one rotor bore portion 150 radially. For example, the bottom surface 1613 connected to the first rotor bore portion 151 extends circumferentially from the end of the first wall surface 1610 of the first plate portion 131 on the axial Da1 side, and is inclined radially toward the axial Da1 side as it approaches the first rotor bore portion 151. Similarly, the bottom surface 1623 connected to the second rotor bore portion 152 extends circumferentially from the end of the second wall surface 1620 of the second plate portion 132 on the axial Da2 side, and is inclined radially toward the axial Da2 side as it approaches the second rotor bore portion 152. In this way, the air between at least one of the plate portions 13 and the stator 2 can flow smoothly toward at least one of the rotor holes 150. Alternatively, the air flowing in from at least one of the rotor holes 150 can flow smoothly between at least one of the plate portions 13 and the stator 2, thereby suppressing or preventing the generation of turbulence.

[0090] <1-2. Stator 2>

[0091] Next, refer to Figures 1 to 2 The stator 2 will be described. The stator 2 drives the rotor 1 to rotate by means of electricity. The stator 2 has an annular stator core 21 surrounding the central shaft CX. As described above, the motor 100 includes the stator 2. In this embodiment, the stator core 21 is a laminated body made of stacked electromagnetic steel sheets.

[0092] The stator 2 also has a coil section 22 on which wires are arranged on the stator core 21. More specifically, the stator 2 also has an insulator 23 with electrical insulation properties. The wires of the coil section 22 are wound on the stator core 21 via the insulator 23.

[0093] <1-3. Stator Cage 3>

[0094] Next, refer to Figures 1 to 2 The stator cage 3 will be described. The stator cage 3 holds the stator 2. As described above, the motor 100 includes the stator cage 3. The stator cage 3 is a cylindrical shape extending axially around the central shaft CX, and supports the shaft 10 for rotation via the bearing 30. The bearing 30... Figure 1 The example shown is a ball bearing, but it is not limited to this example; it could also be other types of bearings such as sliding bearings.

[0095] The stator cage 3 has a cage platform portion 31 and a cage cylinder portion 32. The cage platform portion 31 and the cage cylinder portion 32 extend axially around the central shaft CX. The cage platform portion 31 holds the stator core 21. A portion of the stator core 21 on the axially opposite side (Da2 side) is fixed to the radially outer end of the cage platform portion 31. The cage cylinder portion 32 is positioned radially inward from the end of the cage platform portion 31 on the axially opposite side (Da1 side). The cage cylinder portion 32 is radially opposed to the stator 2 with a gap. By having a gap between the stator 2 and the cage cylinder portion 32, the exposed area of ​​the stator 2 can be further increased. Therefore, the heat dissipation efficiency of the stator 2 can be improved.

[0096] <1-4. Base Part 4>

[0097] Next, refer to Figures 1 to 2 The base portion 4 will be described. The base portion 4 supports the stator cage 3. As described above, the motor 100 includes the base portion 4. The base portion 4 extends in a direction perpendicular to the axial direction and is connected to the end of the stator cage 3 on the opposite side (Da2) of the axial direction. Furthermore, in Figure 1 In this example, the base part 4 is connected by threaded fastening. However, it is not limited to this example; the base part 4 can also be connected by other methods such as bonding or welding.

[0098] The base portion 4 has a base portion recess 41. The base portion recess 41 is disposed on the end face of the base portion 4 on one axial side Da1 and recessed in the other axial side Da2. The base portion recess 41 is connected to the space inside the stator cage 3. The end of the shaft 10 on the other axial side Da2 is inserted into the base portion recess 41.

[0099] Additionally, the base portion 4 has a cage opening 42. The cage opening 42 extends axially through the base portion 4. The cage opening 42 is positioned radially outward from the base portion recess 41. The cage opening 42 is axially opposed to the gap between the radially inner end of the second plate portion 132 and the radially outer end of the cage platform portion 31.

[0100] <1-5. Variations of the First Embodiment>

[0101] Next, refer to Figures 6 to 8 A variation of the first embodiment will be described. Figure 6 This is a cross-sectional view showing a structural example of a motor 100 according to a modified example of the first embodiment. Figure 7 This is a perspective view showing the appearance of the motor 100 of a modified example of the first embodiment. Figure 8This is a cross-sectional view showing an example of the structure of the stator cage 3 as viewed from the axial direction. Furthermore, a structure different from the first embodiment described above will be described here. Also, the same reference numerals are used for the same constituent elements as in the first embodiment described above, and their descriptions are omitted.

[0102] <1-5-1. Rotor 1>

[0103] In a variation of the first embodiment, the rotor 1 further includes a side hole 153 that radially penetrates the cylindrical portion 12. That is, the bore 15 of the rotor 1 includes the side hole 153. By arranging the side hole 153 in the cylindrical portion 12, air cooled from the stator 2 can be exhausted to the outside of the rotor 1 by the rotation of the rotor 1. Therefore, efficient air exchange between the rotor 1 and the stator 2 is possible, thereby improving the cooling efficiency of the stator 2. Furthermore, the exhaust from the side hole 153 prevents water or dust from entering the interior of the rotor 1.

[0104] In addition, Figure 6 and Figure 7 In this example, rotor 1 does not have the first rotor hole 151, the second rotor hole 152, the first slot 161, and the second slot 162. However, it is not limited to this example, and rotor 1 may also have at least some of them.

[0105] The side hole portion 153 includes at least one of a first side hole portion 1531 and a second side hole portion 1532. For example, in Figure 6 and Figure 7 In the middle, the side hole portion 153 includes both a first side hole portion 1531 and a second side hole portion 1532. The first side hole portion 1531 penetrates the first cylindrical portion 121 radially and extends circumferentially. The second side hole portion 1532 penetrates the second cylindrical portion 122 radially. Figures 6 to 8 In this context, the second side hole 1532 is part of the recess 1221 of the second cylindrical portion 122, and is an opening disposed between the bottom surface of the recess 1221 facing one axial direction (Da1 side) and the end of the protrusion 1411 of the rotor core 141 facing the other axial direction (Da2 side). Furthermore, in Figure 6 and Figure 7 In this embodiment, there are multiple first side hole portions 1531 and second side hole portions 1532, which are arranged in the circumferential direction. However, it is not limited to this example, and at least one of the first side hole portions 1531 and second side hole portions 1532 may also be a single one.

[0106] Preferably, at least a portion of the first side hole 1531 is located on the axial side Da1 of the stator core 21. Additionally, at least a portion of the second side hole 1532 is located on the axial side Da2 of the stator core 21. More preferably, all of the first side hole 1531 is located on the axial side Da1 of the stator core 21. Additionally, all of the second side hole 1532 is located on the axial side Da2 of the stator core 21. In this way, the motor 100 can efficiently ventilate the first space 101 and / or the second space 102. For example, by rotating the rotor 1, the motor 100 can expel air between the first plate portion 131 and the stator 2 through the first side hole 1531 to the outside of the rotor 1. Therefore, the motor 100 can improve the heat dissipation efficiency of the portion of the stator 2 on the axial side Da1 (especially the coil head 221). Furthermore, by rotating the rotor 1, the motor 100 can expel the air between the second plate portion 132 and the stator 2 through the second side hole portion 1532 to the outside of the rotor 1. Therefore, the motor 100 can improve the heat dissipation efficiency of the portion of the stator 2 on the other side of the axial direction Da2 (especially the coil head 221).

[0107] In addition, the rotor 1 also has an inclined surface 111 that is inclined toward one side of the axial direction, Da1, as it moves toward the radially outward. The inclined surface 111 is disposed at the end of the rotor hub 11 on the other side of the axial direction, Da2, and extends in the circumferential direction.

[0108] In addition, the rotor 1 also has a rotor cover 17. The rotor cover 17 is disposed on the axial side Da1 and radially outward end of the first plate portion 131, extending radially outward from the radially outward end of the rotor hub 11.

[0109] <1-5-2. Stator Cage 3>

[0110] Next, the stator cage 3 also has a protrusion 33 and a cage through hole 34.

[0111] The protruding spur 33 extends from the end of the retainer platform portion 31 on one axial Da1 side toward the same axial Da1 side, and protrudes radially outward from the radially outer end of the retainer cylinder portion 32. Figure 8 In the middle, three protruding strips 33 are arranged circumferentially. However, it is not limited to Figure 8 For example, the number of protrusions 33 can be one or more than three. A portion of the stator core 21 on one side Da1 of the axial direction is fixed to the radially outer end of the protrusion 33.

[0112] The cage through hole 34 is positioned radially inward of the stator 2 and extends axially through the stator cage 3. As described above, the stator cage 3 has the cage through hole 34. Specifically, the cage through hole 34 extends axially through the cage platform portion 31 and the protruding portion 33. In this way, the first space 101 on the side Da1 of the stator 2, which is axially closer than the stator 2, and the second space 102 on the side Da2 of the stator 2, which is axially closer than the stator 2, can be connected via the cage through hole 34. Furthermore, as mentioned above, the first space 101 is the space between the stator 2 and the first plate portion 131 in the axial direction. The second space 102 is the space between the stator 2 and the second plate portion 132 in the axial direction. By increasing the airflow passage, the air circulation between the rotor 1 and the stator 2 can be made more active. In addition, since the airflow passage extending axially can be positioned radially inward of the stator 2, heat can be dissipated at the radially inner end of the stator 2. Therefore, the heat dissipation efficiency of the stator 2 can be improved.

[0113] At least one end of the cage through-hole 34 on the axially opposite side (Da2) is disposed near the cage opening 42. Preferably, the end of the cage through-hole 34 on the axially opposite side (Da2) overlaps with the cage opening 42 in the axial direction. However, this example does not exclude all structures in which the end of the cage through-hole 34 on the axially opposite side (Da2) does not overlap with the cage opening 42 in the axial direction.

[0114] Furthermore, it is preferable that the minimum diameter of the cage through-hole 34 is smaller than the minimum diameter of the cage opening 42. By making the flow path cross-sectional area of ​​the cage through-hole 34 narrower, the airflow velocity within the cage through-hole 34 can be increased. Therefore, air exchange within the cage through-hole 34 can be achieved more quickly, thereby improving the heat dissipation efficiency of the radially inner end of the stator 2. However, this example does not preclude structures where the minimum diameter of the cage through-hole 34 is greater than or equal to the minimum diameter of the cage opening 42.

[0115] Furthermore, the sum of the opening areas of the ends on the Da2 side of the cage through hole 34 in the axial direction can also be larger than the cross-sectional area occupied by the outer diameter of the cage cylinder portion 32 when viewed from the axial direction. This allows for a further increase in the flow path cross-sectional area of ​​the cage through hole 34, thereby further activating the movement of air within the motor 100 and further improving the heat dissipation efficiency of the stator 2. However, this example does not preclude structures where the sum of the above-mentioned areas is less than the cross-sectional area occupied by the outer diameter of the cage cylinder portion 32 when viewed from the axial direction.

[0116] Furthermore, it is preferable that the end of the cage through-hole 34 on one axial side (Da1 side) is located closer to the end of the stator core 21 on one axial side (Da1 side). This allows the end of the cage through-hole 34 on one axial side (Da1 side) to be closer to the first space 101 between the first plate portion 131 and the stator 2. Therefore, air flowing through the cage through-hole 34 can efficiently flow into the first space 101. However, this example does not preclude a structure where the end of the cage through-hole 34 on one axial side (Da1 side) is not located closer to the end of the stator core 21 on one axial side (Da1 side).

[0117] Furthermore, preferably, the end of the cage through-hole 34 on one axial side (Da1) is axially opposed to the inclined surface 111. More preferably, the entire end of the cage through-hole 34 on one axial side (Da1) overlaps the inclined surface 111 axially. In this way, air flowing out of the cage through-hole 34 axially flows along the inclined surface 111, thereby being smoothly delivered to the first space 101 between the first plate portion 131 and the stator 2. Since air can easily flow from the end of the cage through-hole 34 on one axial side (Da1) toward the first space 101, the heat dissipation efficiency of the stator 2 can be improved. However, this example does not exclude structures where the end of the cage through-hole 34 on one axial side (Da1) is not axially opposed to the inclined surface 111, for example, it does not exclude structures where the rotor 1 does not have the inclined surface 111.

[0118] Furthermore, preferably, the end of the cage through hole 34 on the axial side Da2 is located closer to the axial side Da2 than the end of the stator core 21 on the axial side Da2. This allows air flowing into the cage through hole 34 more easily. However, this example does not preclude a structure where the end of the cage through hole 34 on the axial side Da2 is not located closer to the axial side Da2 than the end of the stator core 21 on the axial side Da2.

[0119] <2. Second Implementation Method>

[0120] Next, refer to Figures 9 to 13 The second embodiment will be described. Figure 9 This is a cross-sectional view showing a structural example of the motor 100 according to the second embodiment. Figure 10 This is a perspective view showing the appearance of the motor 100 according to the second embodiment. Figure 11 This is a perspective view showing the end of the motor 100 of the second embodiment on the other side of the axial direction, Da2. Figure 12 This is a cross-sectional view showing a structural example of a motor 100 according to a modified example of the second embodiment. Figure 13This is a perspective view showing the appearance of the motor 100 in a modified example of the second embodiment. Furthermore, structures in the second embodiment and its modifications that differ from those in the first embodiment and its modifications will be described here. Additionally, the same reference numerals are used for constituent elements identical to those in the first embodiment and its modifications, and their descriptions are omitted.

[0121] like Figures 9 to 13 As shown, the motor 100 of the second embodiment includes a rotor 1, a stator 2, and a stator cage 3.

[0122] <2-1. Rotor 1>

[0123] The first plate portion 131 of the rotor 1 has a disc portion 1311 and a rotor rib 1312. The disc portion 1311 is positioned further axially than the stator 2 on the Da1 side and extends radially outward from the rotor hub 11. The radially outer end of the first plate portion 131 is connected to the first cylindrical portion 121. The rotor rib 1312 extends radially outward from the radially outer end of the rotor hub 11. The radially outer end of the rotor rib 1312 is connected to the first cylindrical portion 121. The end face of the rotor rib 1312 on the Da1 side is positioned further axially than the end face of the disc portion 1311 on the Da1 side.

[0124] The rotor core 141 of rotor 1 has multiple iron chips 1410. The iron chips 1410 are magnetic materials, which are stacks of electromagnetic steel plates stacked in the axial direction. Each iron chip 1410 is disposed on the radially inner side of the cylindrical portion 12 and extends in the axial and circumferential directions. The multiple iron chips 1410 are arranged in the circumferential direction and surround the central shaft CX.

[0125] The rotor 1 has a bore 15 including a side bore 153. The side bore 153 includes a first side bore 1531 and a second side bore 1532. The first side bore 1531 is a recessed portion extending radially through the first cylindrical portion 121 from one axial side (Da1) to the other axial side (Da2), and extends circumferentially. The second side bore 1532 extends radially through the second cylindrical portion 122. The structure of the second side bore 1532 in the second embodiment is similar to that of the second side bore 1532 in the variation of the first embodiment (see reference). Figures 6 to 8 (Same.) Figures 9 to 11 In this embodiment, there are multiple first side hole portions 1531 and second side hole portions 1532 arranged in the circumferential direction. However, it is not limited to this example, and at least one of the first side hole portions 1531 and second side hole portions 1532 may also be a single one.

[0126] In addition, Figures 9 to 11 In the middle, rotor 1 does not have the first rotor hole portion 151 and the second rotor hole portion 152 (see reference). Figure 1) and the first groove 161 and the second groove 162 (see reference) Figure 4A and Figure 4B However, it is not limited to Figures 9 to 11 For example, rotor 1 may also have at least some of them. For example, such as Figure 12 and Figure 13 As shown, the rotor 1 may also have a first rotor hole 151 that extends axially through the disk portion 1311.

[0127] <2-2. Stator Cage 3>

[0128] The stator cage 3 has a cage platform portion 31, a cage cylinder portion 32, and a cage through hole 34. The cage platform portion 31 and the cage cylinder portion 32 are cylindrical, extending axially, and surround the central shaft CX. The cage platform portion 31 holds the stator core 21. A portion of the stator core 21 on the other axial side (Da2) is fixed to the radially outer end of the cage platform portion 31. Furthermore, on the axial side (Da2) closer to the stator 2, the radially outer end of the cage platform portion 31 is radially opposed to the radially inner end of the second plate portion 132 with a gap. That is, the radially inner end of the second plate portion 132 is radially opposed to the stator cage 3 with a gap. The cage cylinder portion 32 is positioned radially inner than the stator core 21. The cage cylinder portion 32 extends from the end of the cage platform portion 31 on the axial side (Da1) toward the axial side (Da1). The portion of the cage cylinder 32 on the axial side (Da1) of the cage platform 31 is radially opposed to the stator 2 with a gap. The cage through hole 34 is located radially inward of the stator 2 and passes through the stator cage 3 axially.

[0129] The cage platform portion 31 has an inner cylinder portion 311, an outer cylinder portion 312, and a plurality of connecting portions 313. The inner cylinder portion 311 and the outer cylinder portion 312 are cylindrical sections extending axially around the central axis CX, and are arranged concentrically on the side opposite to the cage cylinder portion 32 on the axial direction Da2. The end of the inner cylinder portion 311 on the axial direction Da1 side is connected to the cage cylinder portion 32. The outer cylinder portion 312 is positioned radially outward from the inner cylinder portion 311. A portion of the stator core 21 on the axial direction Da2 side is fixed to the radially outer surface of the outer cylinder portion 312. A plurality of connecting portions 313 are disposed between the inner cylinder portion 311 and the outer cylinder portion 312 and are arranged circumferentially. The connecting portions 313 extend radially outward from the inner cylinder portion 311. The radially outer end of the connecting portion 313 is connected to the outer cylinder portion 312.

[0130] In this embodiment, the cage through hole 34 is an opening surrounded by the inner cylinder portion 311, the outer cylinder portion 312, and the adjacent connecting portions 313 in the circumferential direction, and extends through the cage platform portion 31 in the axial direction. Preferably, as Figure 11As shown, the sum of the opening areas of the end of the cage through hole 34 on the opposite side of the axial direction (Da2) is larger than the cross-sectional area occupied by the outer diameter of the cage cylinder portion 32 when viewed from the axial direction. This allows for a further increase in the flow path cross-sectional area of ​​the cage through hole 34 on the opposite side of the axial direction (Da2), thereby further activating air circulation within the motor 100 and further improving the heat dissipation efficiency of the stator 2. However, this example does not preclude structures where the sum is less than the cross-sectional area occupied by the outer diameter of the cage cylinder portion 32 when viewed from the axial direction.

[0131] <3. Other>

[0132] The embodiments of the present invention have been described above. It should be noted that the scope of the present invention is not limited to the above embodiments. The present invention can be implemented with various modifications to the above embodiments without departing from the spirit of the invention. Furthermore, the matters described in the above embodiments can be appropriately and arbitrarily combined without causing contradictions.

[0133] The industrial availability is as follows.

[0134] The present invention is useful, for example, in devices in which the stator heats up according to the rotation of the rotor.

Claims

1. A motor, characterized in that, have: A rotor capable of rotating about a central axis extending axially; and The stator has an annular stator core surrounding the central axis. The rotor has: The cylindrical portion is positioned radially outward from the stator and extends axially. The first plate portion is positioned on the axial side of the stator and extends radially inward from one axial end of the cylindrical portion; The second plate portion is positioned axially on the opposite side of the stator and extends radially inward from the opposite axial end of the cylindrical portion; and A hole that penetrates at least one of the cylindrical portion, the first plate portion, and the second plate portion. The hole includes at least one of a first rotor hole that extends axially through the first plate and a second rotor hole that extends axially through the second plate. At least one of the first plate portion and the second plate portion has a groove and a wall surface facing circumferentially. The slot and the wall surface are disposed at the stator side end of the at least one plate portion in the axial direction, extending at least radially, and are connected to the at least one rotor bore portion. The wall surface is the inner side surface of the groove.

2. The motor according to claim 1, characterized in that, The stator also has a coil section on which wires are arranged on the stator core. When viewed from the axial direction, the at least one rotor hole overlaps with the coil portion.

3. The motor according to claim 1 or 2, characterized in that, The at least one rotor bore is positioned radially inward than the cylindrical portion. The bore also includes a side bore that penetrates the cylindrical portion radially.

4. The motor according to claim 3, characterized in that, At least a portion of the side hole is axially positioned at a position closer to the at least one rotor hole than the stator.

5. A motor, characterized in that, have: A rotor that is capable of rotating about a central axis extending in the axial direction; A stator having an annular stator core surrounding the central axis; and Stator cage, which holds the stator The rotor has: The cylindrical portion is positioned radially outward from the stator and extends axially. The first plate portion is positioned on the axial side of the stator and extends radially inward from one axial end of the cylindrical portion; The second plate portion is positioned axially on the opposite side of the stator and extends radially inward from the opposite axial end of the cylindrical portion; and A hole that penetrates at least one of the cylindrical portion, the first plate portion, and the second plate portion. The stator cage has: The retainer platform portion of the stator core is maintained; The cage cylinder portion extending axially to one side from the cage platform portion; and A cage through hole is provided, positioned radially inward from the stator and radially outward from the cage cylinder portion, and axially penetrating the stator cage.

6. The motor according to claim 5, characterized in that, Viewed axially, the sum of the opening areas at the other end of the cage through hole is larger than the cross-sectional area occupied by the outer diameter of the cage cylinder.

7. The motor according to claim 5, characterized in that, The hole includes at least one of a first rotor hole that extends axially through the first plate and a second rotor hole that extends axially through the second plate. At least one of the first plate portion and the second plate portion has a wall surface facing circumferentially. The wall is disposed at the stator side end of the at least one plate portion in the axial direction, extends at least in the radial direction, and is connected to the at least one rotor bore portion.

8. The motor according to claim 1 or 7, characterized in that, The wall surface slopes circumferentially outward as it faces radially outward.

9. The motor according to claim 1, characterized in that, The at least one plate portion has a bottom surface facing the axial direction. The bottom surface is disposed at the stator side end of the at least one plate portion in the axial direction, extends circumferentially from the wall surface, and is connected to the at least one rotor hole portion. As it approaches the at least one rotor hole portion in the radial direction, it is inclined in the axial direction to the side opposite to the stator, and together with the wall surface, it forms the groove portion.

10. The motor according to claim 1 or 7, characterized in that, The hole portion includes the first rotor hole portion and the second rotor hole portion. The wall surface includes: A first wall surface, disposed at the other axial end of the first plate portion, extends at least radially, connects to the first rotor bore portion, and slopes circumferentially to one side towards the radially inward side; and The second wall, which is disposed at one axial end of the second plate portion, extends at least radially, is connected to the second rotor hole portion, and is inclined circumferentially to the other side as it moves radially inward.

11. A motor, characterized in that, have: A rotor capable of rotating about a central axis extending axially; and The stator has an annular stator core surrounding the central axis. The rotor has: The cylindrical portion is positioned radially outward from the stator and extends axially. The first plate portion is positioned on the axial side of the stator and extends radially inward from one axial end of the cylindrical portion; The second plate portion is positioned axially on the opposite side of the stator and extends radially inward from the opposite axial end of the cylindrical portion; and A hole that penetrates at least one of the cylindrical portion, the first plate portion, and the second plate portion. The hole includes a first rotor hole that penetrates the first plate portion in the axial direction and a second rotor hole that penetrates the second plate portion in the axial direction. The first plate portion and the second plate portion have walls facing circumferentially. The wall surface includes: A first wall surface, disposed at the other axial end of the first plate portion, extends at least radially, connects to the first rotor bore portion, and slopes circumferentially to one side towards the radially inward side; and The second wall, which is disposed at one axial end of the second plate portion, extends at least radially, is connected to the second rotor hole portion, and is inclined circumferentially to the other side as it moves radially inward.

12. An aircraft, characterized in that, The motor having any one of claims 1 to 11.

Images