motor

Abstract

To provide a motor that can enhance the cooling effect. [Solution] A motor 100 driven by a power supply comprises a stator 20 and a rotor 30 arranged with a gap between it and the stator 20. The rotor 30 comprises a pair of disc portions 32 facing each other and magnets 31 held by the pair of disc portions 32. The motor 100 comprises a plurality of support columns 70 arranged on the inner circumference side of the magnets 31 to support the disc portions 32. Each support column 70 is provided such that a space is created in the circumferential direction of the rotor 30. At least one of the plurality of support columns 70 is positioned at a different radial position of the rotor 30 from the other support columns 70, and the innermost support column 70 has an exit angle greater than 0 degrees and less than 90 degrees.

Description

Technical Field

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[0001] The disclosure in this specification relates to a motor.

Background Art

[0002] ​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​A motor (100) that is driven by the supply of electricity, Stator (20) and, It comprises a rotor (30) that rotates around a rotation axis and is positioned with a gap (50) between it and a stator in the axial direction from which the rotation axis extends, The rotor comprises a pair of disc portions (32) facing each other and magnets (31) held by the pair of disc portions. The motor is equipped with multiple support columns (70, 170, 270, 370, 470, 570, 670, 770, 870, 970) positioned on the inner circumference of the magnet to support the disc section. Each support column is positioned so that space is created in the circumferential direction of the rotor. At least one of the multiple support struts is positioned at a different radial location on the rotor from the other struts. The innermost support column is a motor whose exit angle is greater than 0 degrees and less than 90 degrees.

[0008] The rotor of this motor is supported by multiple pillars positioned on the inner circumference of the disc where the magnets are mounted. Each pillar is positioned so that there is space around the rotor in the circumferential direction. Therefore, a space is formed through which air flows from the radially inner to the radially outer side of the rotor. When the rotor rotates, air flows through this space from the radially inner to the radially outer side of the rotor. This airflow becomes a cooling airflow, which cools the stator and rotor.

[0009] If the support struts were arranged to form a linear radial flow path from the inner circumference to the outer circumference of the rotor, separation vortices would be generated in the cooling air. On the other hand, in this motor, the outlet angle of the innermost support strut is greater than 0 degrees and less than 90 degrees. This outlet angle of the innermost support strut means that the struts are positioned in a direction that aligns with the flow of the cooling air, compared to when the struts are arranged to form a linear radial flow path, thus reducing separation vortices.

[0010] In addition, since at least one of the plurality of struts is arranged at a position different from that of the other struts in the radial direction of the rotor, the rigidity of the rotor can be increased as compared with the case where the struts are arranged at one position in the radial direction.

Brief Description of the Drawings

[0011] [Figure 1] Cross-sectional view of the motor according to the first embodiment. [Figure 2] Cross-sectional view taken along line II-II of FIG. 1. [Figure 3] Partial enlarged view of FIG. 2. [Figure 4] Figure for explaining the outlet angle. [Figure 5] Figure for explaining the comparative example. [Figure 6] Figure showing the strut of the second embodiment. [Figure 7] Figure showing the strut of the third embodiment. [Figure 8] Figure showing the strut of the fourth embodiment. [Figure 9] Figure showing the strut of the fifth embodiment. [Figure 10] Figure showing the strut of the sixth embodiment. [Figure 11] Figure showing the strut of the seventh embodiment. [Figure 12] Figure showing the strut of the eighth embodiment. [Figure 13] Figure showing the strut of the ninth embodiment. [Figure 14] Figure showing the strut of the comparative example for comparison with the ninth embodiment. [Figure 15] Figure showing the strut of the tenth embodiment. [Figure 16] Figure showing the strut of the eleventh embodiment. [Figure 17] Figure showing the strut of the twelfth embodiment. [Figure 18] Figure showing the strut of the thirteenth embodiment. [Figure 19] Figure showing the strut of the fourteenth embodiment. [Figure 20] Figure showing the strut of the fifteenth embodiment. [Figure 21]Figure 20 shows a cross-sectional view along the line XXI-XXI. [Modes for carrying out the invention]

[0012] Several embodiments for implementing this disclosure are described below with reference to the drawings. In each embodiment, parts corresponding to matters described in a preceding embodiment are denoted by the same reference numerals, and redundant explanations may be omitted. If only a part of the configuration is described in each embodiment, other parts of the configuration can be applied to other embodiments described in advance. Not only are combinations of parts that are explicitly shown to be combinable in each embodiment possible, but embodiments can also be partially combined even if not explicitly shown, as long as there are no particular problems with the combination.

[0013] <First Embodiment> Figure 1 shows a cross-sectional view of the motor 100 of the first embodiment. The motor 100 is an axial gap type motor. The motor 100 comprises a shaft 10, a stator 20, and a rotor 30.

[0014] The shaft 10 supports the rotor 30. The shaft 10 rotates together with the rotor 30 around the motor axis Cm. The centerline of the shaft 10 coincides with the motor axis Cm. The stator 20 and rotor 30 are arranged side by side in the axial direction AD, along which the motor axis Cm, which is the axis of the motor 100, extends. Figure 1 is a cross-sectional view of the motor 100 cut along the motor axis Cm of the rotor 30.

[0015] The stator 20 is the stator. The stator 20 is configured with coils. The rotor 30 is the rotor. The rotor 30 rotates relative to the stator 20. The rotor 30 rotates around the motor axis Cm. The motor axis Cm is the centerline of the rotor 30. The motor axis Cm can also be called the rotation axis of the rotor 30. The stator 20 extends in an annular shape in the circumferential direction CD. The motor axis Cm coincides with the centerline of the stator 20.

[0016] The rotor 30 comprises a first rotor 30a and a second rotor 30b. The motor 100 is a double-rotor type motor. The motor 100 is sometimes referred to as a double axial motor. The first rotor 30a and the second rotor 30b are arranged in the axial direction AD via a stator 20.

[0017] The rotor 30 includes a magnet 31 and a disc portion 32. Since both the first rotor 30a and the second rotor 30b are equipped with a disc portion 32, the disc portion 32 of the first rotor 30a and the disc portion 32 of the second rotor 30b face each other. The disc portion 32 is fixed to the shaft 10 via a support column 70 and a support column fixing portion 63, which will be described later. Therefore, the disc portion 32 rotates integrally with the shaft 10. The disc portion 32 is an annular plate-shaped member. A magnet holder 33 is formed on the disc portion 32.

[0018] The magnets 31 are embedded in the magnet holder 33. Multiple magnets 31 are arranged in the circumferential direction CD on both the first rotor 30a and the second rotor 30b. The magnets 31 are composed of permanent magnets and form a magnetic field. In the first rotor 30a and the second rotor 30b, the magnets 31 generate magnetic flux. The magnets 31 of the first rotor 30a and the magnets 31 of the second rotor 30b are arranged in the axial direction AD via the stator 20. The magnets 31 are positioned opposite the stator 20.

[0019] The magnet holder 33 holds the magnet 31. The magnet holder 33 is made of a resin material or the like and has electrical insulating properties. For example, the magnet holder 33 is made of CFRP, which is carbon fiber reinforced plastic.

[0020] The motor 100 includes a motor housing 40. The motor housing 40 includes a motor outer wall 41, a rear frame 42, and a drive frame 43. The motor housing 40 houses the stator 20 and the rotor 30.

[0021] The motor outer circumferential wall 41, rear frame 42, and drive frame 43 are formed from an aluminum alloy or other metal material and have thermal conductivity. The motor outer circumferential wall 41 is formed in a cylindrical shape and extends in the axial direction AD. The motor outer circumferential wall 41 covers the stator 20 and rotor 30 from the outer circumferential side. The rear frame 42 and drive frame 43 are formed in a plate shape and extend in the radial direction RD.

[0022] The rear frame 42 and the drive frame 43 are aligned in the axial direction AD via the motor outer wall 41. The rear frame 42 and the drive frame 43 are fixed to the motor outer wall 41 by fasteners such as bolts.

[0023] The motor housing 40 comprises an outer circumferential surface 40a and an inner circumferential surface 40b. The outer circumferential surface 40a is the outer circumferential surface of the motor housing 40 and is included in the outer surface of the motor housing 40. The inner circumferential surface 40b is the inner circumferential surface of the motor housing 40 and is included in the inner surface of the motor housing 40. The outer circumferential surface 40a and the inner circumferential surface 40b are formed on the motor outer circumferential wall 41. The rear frame 42 and the drive frame 43 cover the inner space of the motor outer circumferential wall 41 from both sides in the axial direction AD.

[0024] The busbar 44 is positioned to wrap around the stator 20. The ends of the busbar 44 protrude from the drive frame 43 through an opening in the drive frame 43 and out of the drive frame 43. These ends of the busbar 44 are connected to an inverter. By supplying alternating current to the ends of the busbar 44 via the inverter, an electromagnetic force is generated on the stator 20. This electromagnetic force generates an attractive or repulsive force on the magnet 31, causing the shaft 10 and rotor 30, which are rotatably supported relative to the rear frame 42 and drive frame 43, to rotate. In this way, the motor 100 is driven by the power supply.

[0025] The motor 100 has an axial gap 50. The axial gap 50 includes a first axial gap 50a and a second axial gap 50b. The axial gap 50 is the gap between the stator 20 and the rotor 30. The axial gap 50 extends radially RD between the stator 20 and the rotor 30. The first axial gap 50a is the gap between the stator 20 and the first rotor 30a. The second axial gap 50b is the gap between the stator 20 and the second rotor 30b.

[0026] The motor 100 includes a rear bearing 61 and a drive bearing 62. The rear bearing 61 and the drive bearing 62 rotatably support the shaft 10. The rear bearing 61 and the drive bearing 62 are aligned in the axial direction AD via a first rotor 30a and a second rotor 30b. The rear bearing 61 is fixed to the rear frame 42. The drive bearing 62 is fixed to the drive frame 43.

[0027] The support column fixing portion 63 is provided on the radially inner side of the axial gap 50. The support column fixing portion 63 is fixed to the shaft 10. The support column 70 is fixed to the support column fixing portion 63. The support column fixing portion 63 comprises a base portion 63a and an annular plate-shaped portion 63b. The base portion 63a is the part that is fixed to the shaft 10. The annular plate-shaped portion 63b extends radially outward from the base portion 63a. The annular plate-shaped portion 63b is an annular plate shape that is thinner than the base portion 63a. The base portion 63a is fixed to the shaft 10 at a position where it contacts the convex ring portion 11 provided on the shaft 10 from the axial direction AD. The convex ring portion 11 of the shaft 10 is formed in the central part of the shaft 10 in the axial direction AD and protrudes radially outward from the cylindrical shaft body 12 which is the main body of the shaft 10. The support column 70 is fixed to the annular plate-shaped portion 63b.

[0028] The support column 70 has one end in the axial direction AD fixed to the support column fixing part 63, and the other end in the axial direction AD fixed to the rotor 30. Since the support column fixing part 63 is fixed to the shaft 10, the support column 70 supports the rotor 30. As shown in Figure 1, multiple support columns 70 are provided in the radial direction RD on the inner circumference side of the radial direction RD, i.e., on the motor axis Cm side, relative to the magnet 31. The support columns 70 will be described in detail later using Figures 2 and onward.

[0029] The internal space of the motor housing 40 includes an outer circumferential space 51, an inner circumferential space 52, and a frame space 53. The outer circumferential space 51 is the space on the outer circumferential side of the rotor 30. The outer circumferential space 51 is the space between the rotor 30 and the motor outer circumferential wall 41 in the radial direction RD. The outer circumferential space 51 extends annularly in the circumferential direction CD along the outer circumferential edge of the rotor 30. The outer circumferential space 51 is on the outer circumferential side of the axial gap 50. The axial gap 50 is open radially outward and is therefore ventilated to the outer circumferential space 51.

[0030] The inner circumferential space 52 is the space on the inner side of the rotor 30. The inner circumferential space 52 is the space between the rotor 30 and the shaft 10 in the radial direction RD. The inner circumferential space 52 extends annularly in the circumferential direction CD along the inner end of the rotor 30. The inner circumferential space 52 is on the inner side of the axial gap 50.

[0031] The frame space 53 is the space on the opposite side of the axial gap 50 with respect to the disc portion 32. The frame space 53 is the space between the rotor 30 and the rear frame 42 in the axial direction AD, and between the rotor 30 and the drive frame 43. The frame space 53 extends radially RD along the inner surface of the rear frame 42 or the drive frame 43. The frame space 53 connects the outer peripheral space 51 and the inner peripheral space 52.

[0032] Multiple support columns 70 are positioned far apart from each other, inside the radial RD of the stator 20. Therefore, a space exists between the first rotor 30a and the second rotor 30b. This space is referred to as the space between support columns 54. The space between support columns 54 is located inside the radial RD of the stator 20 and outside the radial RD of the inner circumferential space 52. The space between support columns 54 is provided between the inner circumferential space 52 and the axial gap 50 in the radial RD, and connects the inner circumferential space 52 and the axial gap 50.

[0033] When the rotor 30 rotates in conjunction with the drive of the motor 100, the rotor 30 functions like a centrifugal fan such as a sirocco fan, generating cooling air inside the motor 100. This cooling air is generated by the flow of air or other gases present inside the motor housing 40. The cooling air travels from the inner circumferential space 52, through the space between the support columns 54 and the axial gap 50, to the outer circumferential space 51. Heat generated in the stator 20 and rotor 30 is released into the outer circumferential space 51 along with the cooling air. The cooling air then returns from the outer circumferential space 51 through the frame space 53 to the inner circumferential space 52.

[0034] In the outer peripheral space 51 and frame space 53, the heat from the cooling air is released to the outside of the motor 100 via the motor outer peripheral wall 41, rear frame 42, and drive frame 43. After the cooling air has been cooled in the outer peripheral space 51 and frame space 53 and returned to the inner peripheral space 52, it passes through the space between the support columns 54 and flows again towards the axial gap 50. In this way, the cooling air circulates radially around the disc portion 32.

[0035] Figure 2 is a cross-sectional view taken along line II-II in Figure 1. As shown in Figure 2, there are multiple support columns 70. The multiple support columns 70 are arranged on multiple circumferences with different radii. Specifically, in Figure 2, multiple support columns 70 are arranged on four circumferences with different radii. The support columns 70 are provided on a part of the circumferential CD of the rotor 30. Multiple support columns 70 arranged on one circumference form one circumferential row. In Figure 2, support columns 70 are arranged in four circumferential rows. In one circumferential row, there is space between adjacent support columns 70. Therefore, the space between support columns 54 connects the inner circumferential space 52 and the axial gap 50.

[0036] In each circumferential row, the support columns 70 are arranged at equal angular intervals. The number of support columns 70 in each circumferential row is the same, and the total number of support columns 70 in each circumferential row is 12. The circumferential position of the support columns 70 in each circumferential row is the same as that of the support columns 70 in other circumferential rows. For example, if the innermost support column 70 is used as a reference, each support column 70 in the circumferential row outside the innermost row is in the same circumferential position as any of the support columns 70 in the innermost circumferential row. Therefore, it can be said that the support columns 70 are also aligned in the radial direction. Multiple support columns 70 aligned in one radial direction are arranged at equal intervals from each other. In the first embodiment, the cross-sectional area of ​​the support columns 70 is larger towards the radially outer side when cut by a plane perpendicular to the motor axis Cm.

[0037] Figure 3 shows an enlarged view of a portion of the support columns 70 and the space 54 between the support columns in Figure 2. In Figure 3, the arrows indicate airflow. As shown in Figure 3, the support columns 70 in this embodiment have a rectangular cross-sectional shape. Furthermore, the outlet angles β2 of the multiple support columns 70 at the innermost circumference are all the same, and these outlet angles β2 are slightly less than 30 degrees.

[0038] Figure 4 illustrates the outlet angle β2. The center of the shaft 10 is taken as the origin, and the circle C1 is defined as passing through the radial midpoint at the rear end of the support column 70 in the airflow direction (hereinafter referred to as the rear end midpoint of the support column 70). The angle between the tangent line TL of circle C1 at the rear end midpoint of the support column 70 and the center line CL of the support column 70, which passes through the rear end midpoint of the support column 70 and the radial midpoint at the front end of the support column 70 in the airflow direction, is the outlet angle β2.

[0039] Struts 70 with an exit angle β2 greater than 0 degrees and less than 90 degrees, such as the innermost strut 70, are sometimes called turbo blades 71. In other words, the innermost strut 70 is also a turbo blade 71. Because the innermost strut 70 is a turbo blade 71, when the rotor 30 rotates, the turbo blade 71 generates cooling air. On the other hand, for the struts 70 from the second row onward from the inner side, the inclination of the center of the rotor 30 in the direction of rotation is parallel to the inclination of the tangent line of a circle that takes the center of the shaft 10 as the origin and passes through the center of the rotor 30 in the direction of rotation at that strut 70.

[0040] Furthermore, since the innermost support column 70 is a turbo blade 71, fluid loss generated when the rotor 30 rotates can be reduced. If, as shown in Figure 5, a radially linear flow path FC is formed, a large amount of separation vortex SV will be generated because the intake of the flow path FC is not aligned with the direction of rotation. Separation vortex SV becomes fluid loss and is converted into heat, raising the air temperature inside the motor housing 40. This heat (wind loss) generated by fluid loss, along with heat generated by the motor's iron loss, copper loss, etc., heats the air, raising the temperature of the magnet 31, resin parts, etc., which can cause problems such as demagnetization and reduced part strength.

[0041] In contrast, in this embodiment, the innermost support column 70 is a turbo blade 71. The turbo blade 71 generates airflow as indicated by the arrows in Figure 3, but because the turbo blade 71 is oriented in the direction of the intake flow, unlike in Figure 5, it is possible to suppress the generation of a large amount of separation vortex SV at or near the intake. Therefore, fluid loss that occurs when the rotor 30 rotates can be reduced, and the rise in air temperature inside the motor housing 40 can be suppressed.

[0042] [Summary of the First Embodiment] As described above, the rotor 30 of the motor 100 of this embodiment has a disc portion 32 on which magnets 31 are installed, supported by a plurality of support columns 70 located on the inner circumference of the magnets 31. Each support column 70 is provided on a part of the circumferential direction of the rotor 30. Therefore, a space 54 between the support columns is formed through which air flows from the radially inner side to the radially outer side of the rotor 30. When the rotor 30 rotates, air flows through the space 54 between the support columns from the radially inner side to the radially outer side of the rotor 30. This airflow becomes a cooling airflow that cools the stator 20 and the rotor 30.

[0043] As shown in Figure 5, if the flow path FC is formed linearly in the radial direction from the inner circumference to the outer circumference of the rotor 30, a large amount of separation vortices SV are generated in the cooling air. On the other hand, in this motor 100, the innermost support column 70 is a turbo blade 71. That is, compared to the case where the support column 70 is arranged to form a flow path linearly in the radial direction, the innermost support column 70 is arranged in a direction along the flow of the cooling air, so separation vortices SV can be reduced. Furthermore, the exit angle β2 of the innermost support column 70 does not necessarily have to be the angle shown in Figure 3. If the exit angle β2 of the innermost support column 70 is greater than 0 degrees and less than 90 degrees, the generation of separation vortices SV can be suppressed compared to the comparative example shown in Figure 5. Also, the exit angle β2 of all the innermost support columns 70 does not need to be greater than 0 degrees and less than 90 degrees. If the exit angle β2 of at least one of the multiple innermost support columns 70 is greater than 0 degrees and less than 90 degrees, the generation of separation vortices SV can be suppressed compared to the comparative example shown in Figure 5.

[0044] Furthermore, since the multiple support columns 70 are arranged in four rows in the radial direction RD, the rigidity of the rotor 30 can be increased compared to the case where the support columns 70 are arranged in one location in the radial direction RD.

[0045] Furthermore, the multiple support columns 70 are arranged in multiple circumferential rows in the radial direction RD, and the multiple support columns 70 in each circumferential row are arranged at equal intervals from one another. This arrangement of the support columns 70 makes it difficult for turbulence to occur in the cooling air, thus reducing fluid loss.

[0046] <Second Embodiment> Next, a second embodiment will be described. In the second embodiment, as shown in Figure 6, the shape of the support column 170 differs from that of the support column 70 in the first embodiment. Figure 6 is a cross-sectional view of the support column 170 taken from a plane perpendicular to the motor axis Cm. In Figure 6, the shape of the end of the support column 170 on the side facing the rotor 30 is a convex curve. The convex curve is, for example, a circular arc or an ellipse. The rotor 30 rotates counterclockwise in Figure 6, as indicated by the dashed arrows in Figure 6. Because of the cross-sectional shape in Figure 6, the end face of the support column 170 on the side facing the rotor 30 is a convex curved surface.

[0047] Hereinafter, the forward-moving side of the support column 170 refers to the forward-moving side of the rotor 30 on the support column 170. Similarly, the rear end in the direction of travel of the support column 170 refers to the rear end in the direction of travel of the rotor 30 on the support column 170. The forward-moving side and rear end in the direction of travel of the support column in the third embodiment and subsequent embodiments have the same meaning.

[0048] The rear end of the support column 170 in the direction of travel has a shape in which the length of the radial RD in the cross-section of Figure 6 becomes shorter as it approaches the rear end in the direction of travel. At the rear end of the support column 170, the length of the radial RD in the cross-section of Figure 6 is almost zero, that is, the rear end of the support column 170 has a pointed shape. The cross-section of the support column 170 shown in Figure 6 can be said to be streamlined. The shape of the support column 170 when cut by a cross-section perpendicular to the motor axis Cm is the same regardless of the position of the cross-section.

[0049] In the second embodiment as well, the exit angle β2 of the innermost support 170 is the same as that of the innermost support 70 in the first embodiment. In the second embodiment as well, the innermost support 170 is a turbo blade 171.

[0050] In the second embodiment, the number and position of the support columns 170 are the same as those of the support columns 70 in the first embodiment. Also, the circumferential length of the support columns 170 is the same as the circumferential length of the corresponding support column 70 in the first embodiment.

[0051] In this second embodiment, the support column 170 has a convex curve at the end facing the rotor 30 in a cross-section perpendicular to the motor axis Cm. This reduces fluid loss.

[0052] Furthermore, the support column 170 has a shape in which, in the cross-section described above, the length of the radial RD decreases towards the rear end of the rotor 30 in the direction of travel. This also reduces fluid loss.

[0053] In Figure 6, the shape of the forward-facing end and the shape of the rear end in the direction of travel of all the support columns 170 are identical. However, the forward-facing end of some of the support columns 170 does not have to be a convex curved surface, and the rear end of some of the support columns 170 does not have to be shaped such that the length of the radial RD decreases as it approaches the rear end in the direction of travel.

[0054] <Third Embodiment> In the third embodiment, as shown in Figure 7, a plurality of support columns 170 similar to those in the second embodiment are provided. The difference from the second embodiment is that in the second embodiment, the support columns 170 were arranged in four rows in the radial direction RD, whereas in the third embodiment, the support columns 170 are arranged in three rows in the radial direction RD. The innermost support column 170 is a turbo blade 171.

[0055] <Fourth Embodiment> In the fourth embodiment, as shown in Figure 8, a plurality of support columns 170 similar to those in the second and third embodiments are provided. In the fourth embodiment, the support columns 170 are arranged in five rows in the radial direction RD. The innermost support column 170 is a turbo blade 171.

[0056] As shown in the second to fourth embodiments, the number of rows of radial RD on the support column 170 can be varied. In the third embodiment, the number of rows of radial RD on the support column 170 is smaller than in the second embodiment, thus further reducing fluid loss. However, because the number of rows of radial RD on the support column 170 is smaller, the rigidity of the rotor 30 is lower than in the second embodiment. On the other hand, in the fourth embodiment, the number of rows of radial RD on the support column 170 is larger than in the second embodiment, thus increasing the rigidity of the rotor 30. However, because the number of rows of radial RD on the support column 170 is larger, the fluid loss is greater than in the second embodiment. The number of rows of radial RD on the support column 170 can be appropriately determined by comparing and considering fluid loss and the rigidity of the rotor 30. Also, the number of support columns 170 in each circumferential row can be appropriately determined by comparing and considering fluid loss and the rigidity of the rotor 30.

[0057] <Fifth Embodiment> In the fifth embodiment, as shown in Figure 9, the exit angle β2 of the two innermost rows of support struts 170 is the same as the exit angle β2 of the innermost support struts 170 in the second to fourth embodiments. Therefore, the two innermost rows of support struts 170 are the turbo blades 171. The remaining two outermost rows of support struts 170 are positioned in the same locations as the two outermost rows of support struts 170 in the fourth embodiment.

[0058] As in this embodiment, the struts 170 that function as turbo blades 171 do not have to be only at the innermost circumference. As in the fifth embodiment, fluid loss can be further reduced.

[0059] <Sixth Embodiment> As shown in Figure 10, the support column 270 of the sixth embodiment is a hollowed-out version of the support column 170 of the second embodiment. The exit angle β2 of the innermost support column 270 is the same as the exit angle β2 of the innermost support column 170 of the second embodiment, and the innermost support column 270 is a turbo blade 271. By hollowing out the inside of the support column 270 as in this embodiment, the motor 100 can be made lighter.

[0060] <Seventh Embodiment> As shown in Figure 11, the multiple struts 370 in the seventh embodiment are in the same positions as the struts 170 in the second embodiment. The size of the struts 370 is also the same as the struts 170 in the corresponding positions in the second embodiment. Furthermore, the exit angle β2 of the innermost strut 370 is the same as the exit angle β2 of the innermost strut 170 in the second embodiment, and the innermost strut 370 is a turbo blade 371.

[0061] On the other hand, unlike the support column 170 of the second embodiment, the support columns 370 other than the innermost circumference also have an outlet angle β2 greater than 0 degrees. Therefore, it can be said that the support columns 370 other than the innermost circumference are also turbo blades 371. In the seventh embodiment, the outlet angle β2 of the support columns 370 decreases sequentially as you move from the innermost circumference towards the outer circumference. When the rotor 30 rotates, the direction of the cooling airflow becomes more circumferential towards the outer circumference. Therefore, according to this seventh embodiment, fluid resistance can be further reduced.

[0062] <Eighth Embodiment> Figure 12 shows the eighth embodiment. In the eighth embodiment, the innermost support 170 has the same position, size, and exit angle β2 as in the second embodiment. Therefore, the innermost support 170 is a turbo blade 171. In the eighth embodiment, the support 470 from the second row on the inner side to the fifth row on the outermost side are cylindrical. The size of the multiple support 470 is the same regardless of their arrangement position. By making the support 470 cylindrical, as in this eighth embodiment, the structure of the support 470 is simplified, making it easier to manufacture.

[0063] <Ninth Embodiment> Figure 13 shows the ninth embodiment. In the ninth embodiment as well, the position, size, and exit angle β2 of the innermost support 170 are the same as in the second embodiment, and the innermost support 170 is a turbo blade 171.

[0064] Similar to the second embodiment, multiple support columns 170 are arranged at equal angular intervals around the innermost circumference. Furthermore, the support columns 170 excluding those around the innermost circumference are arranged radially outward from any of the support columns 170 of the innermost circumference. All of the support columns 170 excluding those around the innermost circumference are the same size. Also, the number of support columns 170 arranged radially outward from the innermost circumference support columns 170 is the same for all innermost circumference support columns 170. In other words, the number of support columns 170 in the radial direction RD is the same for all radial directions.

[0065] However, as shown in Figure 13, the arrangement of some of the radial columns 170 in the radial RD differs from the arrangement of radial columns 170 in the circumferential CD from the arrangement of radial columns 170 in the radial RD that includes other adjacent columns 170. This will be explained in detail below. A row in which the columns 170 are arranged radially will be called a radial row. In Figure 13, we focus on the front radial row 510, which is one radial row, and the rear radial row 520, which is a radial row adjacent to the front radial row 510 on the rear side in the rotational direction of the rotor 30.

[0066] The radial positions of the support columns 170 included in the front radial row 510 and the support columns 170 included in the rear radial row 520 are compared. The support columns 170 included in the front radial row 510 are positioned at a different radial position from all of the support columns 170 included in the rear radial row 520.

[0067] Furthermore, the radial positions of the second support column 170 from the inner circumference in the front radial row 510 and the rear radial row 520 are different. The positions of the third support column 170 from the inner circumference and the fourth support column 170 from the inner circumference are also different in the front radial row 510 and the rear radial row 520. In other words, the radial positions of the same number of support columns 170 from the innermost circumference are different in the front radial row 510 and the rear radial row 520. This means that, relative to the radial position of the support columns 170 in the rear radial row 520, the support columns 170 in the front radial row 510 are positioned radially offset.

[0068] As shown in Figure 14, if the radial position of the support column 170 included in the front radial row 510 is the same as the radial position of the support column 170 included in the rear radial row 520, the separation vortex SV generated in the support column 170 of the front radial row 510 may collide with the support column 170 of the rear radial row 520, potentially increasing fluid resistance and generating noise and vibration.

[0069] On the other hand, as in the ninth embodiment, if the radial position of the support column 170 of the front radial row 510 is different from the radial position of the support column 170 of the rear radial row 520, it is possible to suppress the collision of separation vortices SV generated in the support column 170 of the front radial row 510 with the support column 170 of the rear radial row 520. As a result, the increase in fluid resistance, noise, and vibration caused by the collision of separation vortices SV are suppressed.

[0070] <Tenth Embodiment> Figure 15 shows the tenth embodiment. In the tenth embodiment, as in the ninth embodiment, the radial position of the support column 170 included in the front radial row 510 is different from the radial position of the support column 170 included in the rear radial row 520.

[0071] In addition, in the tenth embodiment, the sizes of the support columns 170 from the second row onward from the inner circumference differ from one another in each radial row, including the front radial row 510 and the rear radial row 520. Specifically, in the tenth embodiment, in one radial row, a certain support column 170 from the second row onward from the inner circumference has a different area of ​​the cross-section perpendicular to the motor axis Cm compared to other support columns 170 included in the same radial row. Furthermore, in one radial row, the area of ​​the cross-section perpendicular to the motor axis Cm of the support columns 170 from the second row onward from the inner circumference increases as it moves outward in the radial direction RD.

[0072] The area of ​​the cross-section perpendicular to the motor axis Cm differs for the second row and subsequent rows of support columns 170 from the inner circumference side. As a result, the size of the separation vortex SV generated by each support column 170 differs within a single radial row. When the size of the separation vortex SV differs, the frequency generated by the separation vortex SV is dispersed over a wide bandwidth, thereby suppressing noise and vibration. Figure 15 conceptually shows the relationship between the frequency generated by the separation vortex SV and the size of the support column 170. As shown in Figure 15, the smaller the support column 170, the higher the frequency generated by the separation vortex SV.

[0073] In addition, similar to the ninth embodiment, the radial position of the support column 170 included in the front radial row 510 differs from the radial position of the support column 170 included in the rear radial row 520, thereby suppressing the collision of the separation vortex SV with the support column 170 on the downstream side. This also helps to suppress noise and vibration.

[0074] Furthermore, in a single radial row, the support columns 170 from the second row onward from the inner circumference have a larger cross-sectional area perpendicular to the motor axis Cm as they move outward in the radial direction RD. This allows for increased strength of the rotor 30 while suppressing an increase in fluid resistance from the cooling air.

[0075] <Embodiment 11> Figure 16 shows the support column 570 of the 11th embodiment. Figure 16 is a cross-sectional view of the support column 570 cut by a plane perpendicular to the motor axis Cm. The support column 570 shown in Figure 16 can replace one or more of the supports 70, 170, 270, 370, and 470 described so far. Of course, all of the supports 70, 170, 270, 370, and 470 may be replaced with this support column 570. Therefore, the supports 70, 170, 270, and 370 that make up the turbo blades 71, 171, 271, and 371 may be replaced with this support column 570 while maintaining the exit angle β2.

[0076] The support column 570 has a pair of irregularities on its surface along the direction of travel. These irregularities can be thought to be caused by the continuous formation of curved recesses 570a, as shown in Figure 16, along the flow direction of the support column 570. The support column 570 has an irregularity that is continuous along the flow direction.

[0077] The presence of irregularities on the surface of the support column 570 promotes turbulence on the surface of the support column 570, thereby suppressing the generation of separation vortices SV. Since the generation of separation vortices SV is suppressed, fluid loss, noise, and vibration are reduced. The size of the irregularities can be appropriately determined considering the effect of reducing fluid loss, noise, and vibration. For example, the size of the irregularities can be 10 to 40% of the length of the radial RD of the support column 570 when the outlet angle β2 is 0 degrees. The size of the irregularities is the length of the radial RD of a certain convex or concave part of the support column 570 and the adjacent concave or convex part, when the outlet angle β2 is 0 degrees.

[0078] <Twelfth Embodiment> Figure 17 shows the support column 670 of the twelfth embodiment. The support column 670 shown in Figure 17 is the same as the support column 170 of the second embodiment, but with an uneven surface. Therefore, the end face of the support column 670 on the side facing the rotor 30 is a convex curved surface, and the rear part in the direction of travel has a shape in which the length of the radial RD in the cross-section of Figure 17 becomes shorter as it approaches the rear end in the direction of travel. Also, the exit angle β2 of the innermost support column 670 is the same as that of the support column 170 located at the innermost circumference in the second embodiment. Therefore, in this twelfth embodiment as well, the innermost support column 670 is a turbo blade 671.

[0079] Furthermore, multiple protrusions 670a are formed on the surface of the support column 670 in a direction along the direction of movement of the support column 670. The multiple protrusions 670a formed on a single support column 670 may vary in size. If we use the recessed portion as a reference, it can be said that multiple protrusions 670a are formed on the support column 670. However, if we use the protrusions 670a as a reference, it can also be said that multiple recesses are formed on the support column 670.

[0080] According to this twelfth embodiment, in addition to the fluid loss reduction effect due to the shape of the end face on the forward-facing side of the support column 670 and the shape of the rear part of the support column 670 in the direction of travel, a fluid loss reduction effect due to surface irregularities can also be obtained.

[0081] <13th Embodiment> Figure 18 shows the support column 770 of the 13th embodiment. Figure 18 is a cross-sectional view of the support column 770 taken from a plane perpendicular to the motor axis Cm. The support column 770 shown in Figure 18 can be replaced with one or more of the support columns 70, 170, 270, 370, and 470 described above.

[0082] The support column 770 has a shape in which multiple recesses 771 are formed in the direction of travel on a pair of surfaces aligned with the direction of travel. The recesses 771 are formed discontinuously on the pair of surfaces aligned with the direction of travel. There is a flat section 772 between one recess 771 and another recess 771 adjacent to it. The flat section 772 is a straight line in the cross-sectional shape shown in Figure 18. The recesses 771 are recessed in the direction of the other surface more than the flat section 772. The recesses 771 are arc-shaped in the cross-section shown in Figure 18. The boundary between the recesses 771 and the flat section 772 is a corner.

[0083] Since the column 770 has a recess 771 formed therein, similar to columns 570 and 670, turbulence on the surface is promoted, and the generation of separation vortices SV is suppressed.

[0084] <14th Embodiment> Figure 19 shows the support column 870 of the 14th embodiment. Figure 19 is a cross-sectional view of the support column 870 taken from a plane perpendicular to the motor axis Cm. The support column 870 shown in Figure 19 can be replaced by one or more of the support columns 70, 170, 270, 370, and 470 described above.

[0085] The recess 771 of the support column 770 in the previous embodiment had an arc-shaped cross-section as shown in Figure 18. In contrast, the recess 871 of the support column 870 has a cross-sectional shape that is half an octagon as shown in Figure 19. The flat portion 872 is also a straight line in the cross-section shown in Figure 19, similar to the flat portion 772 of the support column 770. However, the flat portion 872 is slightly larger than the flat portion 772.

[0086] Thus, the shape of the recess 871 may be polygonal, and the size of the flat portion 872 can also be varied.

[0087] <15th Embodiment> Figure 20 shows the 15th embodiment. In the 15th embodiment, the support column 970 has multiple protrusions 970a formed in the axial direction AD. Except for the support column 970, it is the same as the motor 100 shown in Figure 1. As shown in Figure 20, the protrusions 970a are formed discontinuously in the axial direction AD. Note that in the previous embodiments, the shape of the cross-section perpendicular to the axial direction AD of the support column is the same regardless of the position in the axial direction AD.

[0088] Figure 21 is a cross-sectional view taken along line XXI-XXI of Figure 20. As shown in Figure 21, the protrusions 970a are formed in multiple locations along the direction of travel of the support column 970, similar to the protrusions 670a formed on the support column 670 of the twelfth embodiment.

[0089] In the above explanation, it was assumed that a protrusion 970a is formed on the support column 970. However, if we consider the top of the protrusion 970a as the reference point, it can also be said that a recess is formed on the support column 970. Furthermore, in Figure 20, if we consider the flat area between two adjacent protrusions 970a in the axial direction AD as the reference point, it can also be said that both a recess and a protrusion are formed on the support column 970.

[0090] Although embodiments have been described above, the disclosed technology is not limited to the embodiments described above. The following modifications are also included within the scope of disclosure, and further modifications can be made in various ways without departing from the gist of the invention. The number of support columns included in a single circumferential row is not limited to the number described in the embodiment, but can be varied in various ways. The number of protrusions or recesses formed on a single support column may be one. Furthermore, the size of the protrusions or recesses in the direction of travel of the support column is not limited to the size shown in the embodiment. For example, the size of the protrusions or recesses in the direction of travel of the support column may be more than half the length of the support column in that direction. The number of support columns included in each of the multiple radial rows may differ from one another. For example, in the 14th and 15th embodiments, the number of support columns 170 included in the front radial row 510 and the rear radial row 520 was the same. However, the number of support columns 170 included in the front radial row 510 may be less than the number of support columns 170 included in the rear radial row 520, and the radial position of the support columns 170 included in the front radial row 510 may be different from the radial position of the support columns 170 included in the rear radial row 520. [Explanation of Symbols]

[0091] 20...Stator, 30...Rotor, 31...Magnet, 32...Disk section, 50...Gap, 70...Support column, 100...Motor, 170...Support column, 270...Support column, 370...Support column, 470...Support column, 510...Front radial row, 520...Rear radial row, 570...Support column, 570a...Recess, 670...Support column, 670a...Convex part, 770...Support column, 771...Recess, 870...Support column, 871...Recess, 970...Support column, 970a...Convex part

Claims

1. A motor (100) that is driven by the supply of electricity, Stator (20) and, The system comprises a rotor (30) that rotates about a rotation axis and is positioned with a gap (50) between it and the stator in the axial direction from which the rotation axis extends, The rotor comprises a pair of disc portions (32) facing each other and magnets (31) held by the pair of disc portions. The motor comprises a plurality of support columns (70, 170, 270, 370, 470, 570, 670, 770, 870, 970) positioned on the inner circumference side of the magnet and supporting the disc portion. Each of the aforementioned support columns is provided such that a space is created in the circumferential direction of the rotor. At least one of the multiple support columns is positioned at a different location in the radial direction of the rotor from the other support columns. The innermost support column of the motor has an exit angle greater than 0 degrees and less than 90 degrees.

2. At least one of the multiple support columns has a convex curve at the end of the column on the side of the rotor's rotation when viewed in a cross-section perpendicular to the rotor's rotation axis. The motor according to claim 1.

3. The multiple support columns are arranged in multiple rows in the radial direction of the rotor, and the multiple support columns in each row are arranged at equal intervals from one another. The motor according to claim 1.

4. Multiple of the aforementioned support columns are arranged in four or more rows in the radial direction of the rotor. The support columns forming multiple rows on the innermost circumference have an exit angle greater than 0 degrees and less than 90 degrees. The motor according to claim 1.

5. Multiple of the aforementioned support columns are arranged in multiple rows in the radial direction of the rotor. The support columns in rows other than the innermost one have an exit angle of 0 degrees or more and a smaller exit angle than the support column of the innermost one. The motor according to claim 1.

6. The exit angle of the aforementioned support column becomes smaller towards the outer periphery. The motor according to claim 5.

7. At least one of the multiple support columns is hollow inside. The motor according to claim 1.

8. At least one of the aforementioned support columns, excluding the innermost one, is cylindrical. The motor according to claim 1.

9. Multiple of the aforementioned support columns are arranged around the innermost circumference. The multiple support columns, excluding the innermost one, are arranged radially outward from one of the support columns of the innermost one. One radial row of the support columns arranged radially is designated as the front radial row (510), and the rear radial row (520) is adjacent to the front radial row on the rear side in the rotational direction of the rotor. At least one of the support columns included in the front radial row is positioned radially different from any of the support columns included in the rear radial row. The motor according to claim 1.

10. One of the radial rows includes three or more of the support columns, At least one of the support columns from the second to the innermost side has a different cross-sectional area perpendicular to the rotation axis of the rotor from the other support columns included in the same radial row. The motor according to claim 9.

11. One of the radial rows includes three or more of the support columns, Among the support columns included in the same radial row, the second and subsequent support columns from the innermost side have a larger cross-sectional area perpendicular to the rotor's rotation axis as they are positioned radially outward. The motor according to claim 9.

12. Multiple of the aforementioned support columns are arranged around the innermost circumference. The multiple support columns, excluding the innermost one, are arranged radially outward from one of the support columns of the innermost one. One radial row of the support columns arranged radially is designated as the front radial row (510), and the rear radial row (520) is adjacent to the front radial row on the rear side in the rotational direction of the rotor. At least one of the support columns included in the front radial row is positioned at a radial position different from any of the support columns included in the rear radial row. One of the radial rows includes three or more of the support columns, At least one of the support columns from the second to the innermost side has a different cross-sectional area perpendicular to the rotation axis of the rotor from the other support columns included in the same radial row. The motor according to claim 9.

13. Multiple of the aforementioned support columns are arranged around the innermost circumference. The multiple support columns, excluding the innermost one, are arranged radially outward from one of the support columns of the innermost one. One radial row of the support columns arranged radially is designated as the front radial row (510), and the rear radial row (520) is adjacent to the front radial row on the rear side in the rotational direction of the rotor. At least one of the support columns included in the front radial row is positioned at a radial position different from any of the support columns included in the rear radial row. One of the radial rows includes three or more of the support columns, Among the support columns included in the same radial row, the second and subsequent support columns from the innermost side have a larger cross-sectional area perpendicular to the rotor's rotation axis as they are positioned radially outward. The motor according to claim 9.

14. At least one of the plurality of support columns has at least one of the following formed on its surface: recesses (570a, 771, 871) and protrusions (670a, 970a). The motor according to claim 1.

15. At least one of the multiple support columns has multiple recesses or protrusions formed on its surface. The aforementioned recesses or protrusions are formed discontinuously in multiple locations along the axial direction of the support column. The motor according to claim 14.

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