Rotor and rotary electric machine

Abstract

A rotor of one embodiment of the present application includes a first rotor portion and a second rotor portion which are arranged to be displaced from each other in a circumferential direction. The first rotor portion has a first rotor core provided with a first through-hole extending in an axial direction and a first magnet. The second rotor portion has a second rotor core provided with a second through-hole extending in the axial direction and a second magnet. Magnetic poles of the first rotor portion are arranged to be displaced to a circumferential one side with respect to magnetic poles of the second rotor portion. In the first rotor portion, a center of the first through-hole is arranged at a position displaced by a first angle to a circumferential other side from the magnetic poles of the first rotor portion. In the second rotor portion, a center of the second through-hole is arranged at a position displaced by a second angle to the circumferential other side from the magnetic poles of the second rotor portion. The second angle is larger than the first angle. In a boundary portion of the first rotor portion and the second rotor portion, an opening of the first through-hole and an opening of the second through-hole overlap each other.

Description

Technical Field

[0001] This invention relates to rotors and rotary electric motors. Background Technology

[0002] A rotary electric motor has a rotor capable of rotating about a central axis and a stator located radially outward from the rotor. The rotor has multiple rotor cores arranged axially. Patent Document 1 discloses a rotor in which multiple iron core blocks are staggered circumferentially by a predetermined torsional angle and overlap axially. [Existing technical documents] [Patent Literature]

[0003] Patent Document 1: Japanese Patent No. 6688327

[0004] In conventional rotors, the relative positions of the magnetic poles and the through holes are consistent within each rotor core (core block). Therefore, at the boundaries between rotor cores, the opening positions of the through holes are staggered. Consequently, if the through holes are used as refrigerant flow paths, for example, the pipe resistance increases at the boundaries of the rotor cores, potentially hindering the smooth flow of refrigerant. Summary of the Invention

[0005] One of the objectives of this invention is to provide a rotor and a rotary motor capable of suppressing the misalignment of the through holes.

[0006] One aspect of the present invention is a rotor of a rotary electric motor that rotates around a central axis. The rotor includes a first rotor portion and a second rotor portion that are circumferentially offset from each other and axially stacked. The first rotor portion has: a first rotor core having a first through hole extending axially; and a first magnet held in the first rotor core. The second rotor portion has: a second rotor core having a second through hole extending axially; and a second magnet held in the second rotor core. The magnetic poles of the first rotor portion are offset circumferentially relative to the magnetic poles of the second rotor portion. In the first rotor portion, the center of the first through hole is positioned at a position offset circumferentially from the magnetic pole of the first rotor portion by a first angle. In the second rotor portion, the center of the second through hole is positioned at a position offset circumferentially from the magnetic pole of the second rotor portion by a second angle. The second angle is greater than the first angle. At the boundary between the first rotor portion and the second rotor portion, when viewed axially, the opening of the first through hole overlaps with the opening of the second through hole.

[0007] According to the present invention, a rotor and a rotary motor capable of suppressing the misalignment of the through holes with each other can be provided. Attached Figure Description

[0008] Figure 1 This is a schematic structural diagram of a drive device according to one implementation method. Figure 2 This is a perspective view of a rotor according to one implementation method. Figure 3 This is a cross-sectional perspective view of a rotor according to one embodiment. Figure 4 This is a top view of the first rotor section in one embodiment. Figure 5 This is a top view of the second rotor section in one embodiment. Figure 6 This is a schematic cross-sectional view of a rotor along its axial direction in one embodiment. Figure 7 This is a cross-sectional schematic diagram of a rotor according to one embodiment. Figure 8 This is a schematic structural diagram of the flow path structure of a rotor that can be used in one implementation. Figure 9 This is a cross-sectional schematic diagram of the rotor of variant example 1. Figure 10 This is a cross-sectional schematic diagram of the rotor of variant example 2. Figure 11 This is a cross-sectional schematic diagram of the rotor of variant example 3. Figure 12 This is a top view of the rotor of variant example 4. Figure 13 This is a top view of the rotor of variant example 5. Figure 14 This is a cross-sectional schematic diagram of the rotor of variant example 6. Figure 15 This is a cross-sectional schematic diagram of the rotor of variant example 7. (Symbol Explanation) 10… Rotary motor; 20, 120, 620… Rotor section; 20A, 120A, 220A, 320A, 420A, 520A, 620A, 720A… First rotor section; 20B, 120B, 220B, 320B, 420B, 520B, 620B, 720B… Second rotor section; 21… Through hole; 21A, 121A, 221A, 321A, 4… 21A, 521A, 621A, 721A… First through hole; 21Aa, 21Ba, 121Aa, 121Ba, 221Aa, 221Ba, 321Aa, 321Ba, 621Aa, 621Ba, 721Aa, 721Ba… Opening; 21B, 121B, 221B, 321B, 421B, 521B, 621B, 721B… Second through hole. Perforations: 22, 23, 24… Magnet storage holes; 22A, 23A, 24A… First magnet storage holes; 22B, 23B, 24B… Second magnet storage holes; 25… Magnetic poles; 25A… First magnetic pole; 25B… Second magnetic pole; 26… Rotor core; 26A… First rotor core; 26B… Second rotor core; 27, 28, 29… Magnets; 27A, 28A, 29A… First magnet; 27… B, 28B, 29B… Second magnet; 30, 130, 230, 330, 430, 530, 630, 730… Rotor; 31… Shaft; 31h… Hollow section; 32, 132, 232, 332, 632, 732… Boundary section; 33… Refrigerant supply hole (connecting hole); 40… Stator; 97A… Flow path; J… Central axis; α1… First angle; α2… Second angle. …twist at an angle. Detailed Implementation

[0009] In the following description, the vertical direction is defined based on the positional relationship of the drive unit mounted on a vehicle located on a horizontal road surface according to the embodiments. That is, when the drive unit is mounted on a vehicle located on a horizontal road surface, at least the vertically related relative positional relationship described in the following embodiments needs to be satisfied.

[0010] In the accompanying drawings, the XYZ coordinate system is appropriately shown as a three-dimensional Cartesian coordinate system. In the XYZ coordinate system, the Z-axis direction is the vertical direction. The +Z side is the upper vertical direction, and the -Z side is the lower vertical direction. In the following description, the upper vertical direction is simply referred to as the "upper side," and the lower vertical direction is simply referred to as the "lower side." The X-axis direction is the direction orthogonal to the Z-axis direction and is the forward-backward direction of the vehicle equipped with the drive unit. In the following embodiments, the +X side is the front side of the vehicle, and the -X side is the rear side of the vehicle. The Y-axis direction is the direction orthogonal to both the X-axis and Z-axis directions and is the left-right direction of the vehicle, i.e., the vehicle width direction. In the following embodiments, the +Y side is the left side of the vehicle, and the -Y side is the right side of the vehicle. The forward-backward direction and the left-right direction are horizontal directions orthogonal to the vertical direction.

[0011] Furthermore, the front-to-back positional relationship is not limited to the positional relationship in the following implementation; it can also be that the +X side is the rear side of the vehicle and the -X side is the front side of the vehicle. In this case, the +Y side is the right side of the vehicle and the -Y side is the left side of the vehicle. Additionally, in this specification, "parallel direction" also includes generally parallel directions, and "orthogonal direction" also includes generally orthogonal directions.

[0012] The central axis J, as appropriately illustrated, is an imaginary axis extending in a direction intersecting the vertical direction. More specifically, the central axis J extends in the Y-axis direction, which is orthogonal to the vertical direction, i.e., the left-right direction of the vehicle. In the following description, unless otherwise specified, the direction parallel to the central axis J is simply referred to as the "axial direction," the radial direction centered on the central axis J is simply referred to as the "radial direction," and the circumferential direction centered on the central axis J, i.e., the axis around the central axis J, is simply referred to as the "circumferential direction." In this embodiment, one side of the axial direction corresponds to the right side (-Y side), and the other side of the axial direction corresponds to the left side (+Y side).

[0013] The arrow θ in the appropriate illustration indicates the circumferential direction. In the following explanation, the side of the circumferential direction that moves clockwise from the right side with respect to the central axis J, i.e., the side in which the arrow θ points (+θ side), is called the "circumferential side". The opposite side of the side of the circumferential direction that moves counterclockwise from the right side with respect to the central axis J, i.e., the side in which the arrow θ points (-θ side), is called the "circumferential side".

[0014] Figure 1 This is a schematic structural diagram of the drive device 100 in this embodiment. The drive unit 100 is a drive device mounted on a vehicle and rotating the axle 64. Vehicles equipped with the drive unit 100 are hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHVs), electric vehicles (EVs), and other vehicles powered by an electric motor. Figure 1As shown, the drive unit 100 includes a rotary motor 10, a housing 80, a transmission device 60, and a refrigerant flow path 90. The rotary motor 10 includes a rotor 30 that rotates around a central axis J, and a stator 40 that surrounds the rotor 30 radially outward. Other structures of the rotary motor 10 besides those described above will be described later.

[0015] The housing 80 houses the rotary motor 10 and the transmission device 60. The housing 80 includes a motor housing 81 and a gear housing 82. The motor housing 81 is a housing that internally houses the rotor 30 and the stator 40. The motor housing 81 is connected to the right side of the gear housing 82. The motor housing 81 has a peripheral wall portion 81a, a partition wall 81b, and a cover portion 81c. The peripheral wall portion 81a and the partition wall 81b are, for example, part of the same single component. The cover portion 81c is, for example, separately formed from the peripheral wall portion 81a and the partition wall 81b.

[0016] The peripheral wall portion 81a is cylindrical, surrounding the central axis J and opening on the right side. A partition wall 81b is connected to the left end of the peripheral wall portion 81a. The partition wall 81b axially separates the interior of the motor housing 81 from the interior of the gear housing 82. The partition wall 81b has a partition wall opening 81d connecting the interior of the motor housing 81 to the interior of the gear housing 82. A bearing 34 is held on the partition wall 81b. A cover portion 81c is fixed to the right end of the peripheral wall portion 81a. The cover portion 81c closes the opening on the right side of the peripheral wall portion 81a. A bearing 35 is held on the cover portion 81c.

[0017] The gear housing 82 internally houses the reduction gear 62 and differential gear 63 (described later) of the transmission device 60, as well as refrigerant O. Refrigerant O is stored in the lower region within the gear housing 82. Refrigerant O circulates within the refrigerant flow path 90 (described later). Refrigerant O is used as a refrigerant for cooling the rotary motor 10. Refrigerant O is preferably an oil that lubricates the reduction gear 62 and differential gear 63. As refrigerant O, for example, to perform the functions of both refrigerant and lubricant, it is preferable to use an oil with a low viscosity equivalent to automatic transmission fluid (ATF).

[0018] The transmission device 60 is connected to the rotary motor 10 and transmits the rotation of the rotor 30 to the axle 64 of the vehicle. In this embodiment, the transmission device 60 has a reduction gear 62 connected to the rotary motor 10 and a differential gear 63 connected to the reduction gear 62. The differential 63 has a gear ring 63a. The torque output from the rotary motor 10 is transmitted to the gear ring 63a via the reduction gear 62. The lower end of the gear ring 63a is immersed in refrigerant O stored in the gear housing 82. By rotating the gear ring 63a, the refrigerant O is agitated. The agitated refrigerant O is supplied to the reduction gear 62 and the differential 63, for example, as lubricating oil.

[0019] The rotary motor 10 is the part that drives the drive device 100. The rotary motor 10 is located, for example, on the right side of the transmission device 60. In this embodiment, the rotary motor 10 is a motor. The torque of the rotor 30 of the rotary motor 10 is transmitted to the transmission device 60.

[0020] The rotor 30 includes: a shaft 31 extending axially around a central axis J; eight rotor sections 20 fixed on the shaft 31; at least one spacer 38 disposed between axially adjacent rotor sections 20; and a pair of end plates 39 disposed at both axial ends of the stacked rotor sections 20.

[0021] Shaft 31 extends axially around its central axis J. Shaft 31 rotates about its central axis J. Shaft 31 is rotatably supported by bearings 34 and 35. In this embodiment, shaft 31 is a hollow shaft with a hollow portion 31h extending axially. Shaft 31 is cylindrical, allowing refrigerant O to flow inside. Shaft 31 extends across the interior of motor housing 81 and gear housing 82. The left end of shaft 31 protrudes into the interior of gear housing 82. A reduction gear 62 is connected to the left end of shaft 31.

[0022] Figure 2 This is a perspective view of the rotor 30 in this embodiment. Figure 3 This is a cross-sectional perspective view of the rotor 30 in this embodiment. like Figure 3 As shown, the shaft 31 is formed in a generally cylindrical shape. The inner diameter of the end on one axial side (-Y side) of the shaft 31 is smaller than the inner diameter of the portion other than the end on one axial side. The shaft 31 has a portion whose inner diameter gradually or progressively increases from the end on one axial side toward the other axial side (+Y side). This portion corresponds to the upstream portion of the axial flow path 95 of the refrigerant flow path 90, which will be described later. A refrigerant guide portion 31a is provided on the shaft 31, which is recessed radially outward from the inner circumference of the shaft 31, and a refrigerant supply hole (connecting hole) 33 penetrates the peripheral wall of the shaft 31.

[0023] The refrigerant guide section 31a is an annular groove centered on the central axis J. The refrigerant guide section 31a has: a pair of groove walls 31b and 31c arranged axially separated from each other; and a groove bottom 31d located axially between the pair of groove walls 31b and 31c and facing radially inward. One of the groove walls 31b and 31c, located on one axial side, is formed as a cone facing radially outward towards the other axial side. Therefore, the refrigerant O flowing from one axial side to the other axial side within the shaft 31 is stably guided towards the groove bottom 31d by one of the groove walls 31b. The other groove wall 31c, located on the other axial side, is a planar shape extending in a direction perpendicular to the central axis J and facing axially. Therefore, the refrigerant O guided to the groove bottom 31d is prevented from crossing the other groove wall 31c on the other axial side, and the refrigerant O is stably held in the refrigerant guide section 31a. The bottom of the tank 31d is located on the outermost radial side in the refrigerant guide section 31a.

[0024] The refrigerant supply hole 33 is a circular hole extending radially inside the circumferential wall of the shaft 31. That is, the refrigerant supply hole 33 extends radially outward from the hollow portion 31h. Multiple refrigerant supply holes 33 are provided on the shaft 31. These multiple refrigerant supply holes 33 are arranged at intervals in the circumferential direction. In this embodiment, eight refrigerant supply holes 33 are provided at equal intervals in the circumferential direction. The refrigerant supply hole 33 opens at the bottom of the groove 31d. That is, the refrigerant supply hole 33 opens at the refrigerant guide portion 31a. According to this embodiment, the refrigerant O flowing within the shaft 31 is efficiently guided by the refrigerant guide portion 31a to the refrigerant supply hole 33, and flows within the rotor 30 as described later, thereby improving the cooling efficiency of the rotor 30.

[0025] like Figure 3 As shown, the plurality of rotor sections 20 each have a rotor core 26 and magnets 27, 28, and 29. Furthermore, in the following description, when comparing the rotor sections 20 stacked along the axial direction, one will be referred to as the first rotor section 20A and the other as the second rotor section 20B.

[0026] Figure 4 This is a top view of the first rotor section 20A. Figure 5 This is a top view of the second rotor section 20B. The rotor core 26 and magnets 27, 28, and 29 of the first rotor section 20A are referred to as first rotor core 26A, first magnet 27A, 28A, and 29A, respectively. The rotor core 26 and magnets 27, 28, and 29 of the second rotor section 20B are referred to as second rotor core 26B, second magnet 27B, 28B, and 29B, respectively. That is, the rotor 30 has a first rotor section 20A and a second rotor section 20B stacked along the axial direction. The first rotor section 20A has a first rotor core 26A and first magnets 27A, 28A, and 29A. The second rotor section 20B has a second rotor core 26B and second magnets 27B, 28B, and 29B.

[0027] The rotor core 26 is a magnetic material. The rotor core 26 is cylindrical, centered on the central axis J. The inner circumferential surface of the rotor core 26 is fixed to the outer circumferential surface of the shaft 31 by pressing. The rotor core 26 and the shaft 31 are fixed so as not to move relative to each other in the axial, radial, and circumferential directions. The rotor core 26 has a plurality of electromagnetic steel plates (not shown) arranged overlapping in the axial direction.

[0028] Each rotor core 26 has multiple (eight in this embodiment) through holes 21 and multiple (24 in this embodiment) magnet receiving holes 22, 23, 24. The through holes 21 and magnet receiving holes 22, 23, 24 of the first rotor core 26A are referred to as the first through hole 21A and the first magnet receiving holes 22A, 23A, 24A, respectively. In addition, the through holes 21 and magnet receiving holes 22, 23, 24 of the second rotor core 26B are referred to as the second through hole 21B and the second magnet receiving holes 22B, 23B, 24B, respectively.

[0029] First magnets 27A, 28A, and 29A are inserted into first magnet storage holes 22A, 23A, and 24A, respectively. Second magnets 27B, 28B, and 29B are inserted into second magnet storage holes 22B, 23B, and 24B, respectively.

[0030] Magnet receiving holes 22, 23, and 24 extend axially through the rotor core 26. The magnet receiving holes 22, 23, and 24 are approximately quadrilateral in shape when viewed axially, but are approximately rectangular in this embodiment. Magnets 27, 28, and 29 are received in the magnet receiving holes 22, 23, and 24, respectively. A group of three magnet receiving holes 22, 23, and 24 arranged in an isosceles triangular shape when viewed axially.

[0031] Of the three magnet storage holes 22, 23, and 24 that form a set, the radial positions of two magnet storage holes 23 and 24 arranged circumferentially coincide with the radial position of the through hole 21. That is, the through hole 21 and the magnet storage holes 23 and 24 are arranged side by side in the circumferential direction.

[0032] The through hole 21 extends through the rotor core 26 along the axial direction. In this embodiment, the through hole 21 is circular when viewed from the axial direction. However, the shape of the through hole 21 is not limited to this embodiment; for example, the through hole 21 may also be other shapes, such as being approximately quadrilateral when viewed from the axial direction.

[0033] Multiple through holes 21 are provided circumferentially spaced apart on the rotor core 26. In this embodiment, eight through holes 21 are provided circumferentially at equal intervals on each rotor core 26. Each through hole 21 is disposed between adjacent magnet receiving holes 23 and 24 in the circumferential direction. The structure of the through holes 21 will be described in more detail later.

[0034] like Figure 2 As shown, in the rotor 30 of this embodiment, four rotor sections 20 are respectively provided on one side and the other side of the spacer 38. At least two of the plurality of rotor sections 20 are arranged in a circumferentially staggered manner. That is, in this embodiment, since a stepping skew is provided on the rotor 30, it is possible to reduce cogging torque and torque pulsation, suppress vibration of the rotary motor 10, and improve rotational efficiency.

[0035] In the rotor 30, a plurality of rotor portions 20 stacked on one axial side (-Y side) relative to the spacer 38 are configured to be offset toward one circumferential side (+θ side) as they move away from the spacer 38 toward one axial side (-Y side).

[0036] In the rotor 30, a plurality of rotor portions 20 stacked on the other side (+Y side) of the axial direction relative to the spacer 38 are configured to be offset to one side (+θ side) in the circumferential direction as they move away from the spacer 38 to the other side (+Y side) of the axial direction.

[0037] The torsional direction of the stepping skew of the plurality of rotor sections 20 arranged on one axial side of the spacer 38 is different from that of the plurality of rotor sections 20 arranged on the other axial side of the spacer 38. As a result, it is possible to further reduce cogging torque and torque pulsation.

[0038] Magnets 27, 28, and 29 are, for example, neodymium magnets or ferrite magnets. Magnets 27, 28, and 29 are, for example, rectangular plates. Figure 4 and Figure 5 As shown, multiple magnets 27, 28, and 29 are provided on the rotor section 20. Each magnet 27, 28, and 29 is housed in a magnet storage hole 22, 23, or 24.

[0039] Magnets 27, 28, and 29 are fixed to the rotor section 20, for example, by an adhesive (not shown). The three magnets 27, 28, and 29, housed in the three magnet storage holes 22, 23, and 24 and arranged in an isosceles triangle shape, constitute a magnetic pole 25.

[0040] In this embodiment, the rotor section 20 is provided with eight magnetic poles 25. The eight magnetic poles 25 are arranged at equal intervals along a circumferential direction. Through holes 21 are provided between adjacent magnetic poles 25 in the circumferential direction.

[0041] The multiple magnetic poles 25 are classified into N poles 25 forming N poles on the outer peripheral surface of the rotor section 20 and S poles 25 forming S poles on the outer peripheral surface of the rotor section 20. The N poles 25 and S poles 25 are arranged alternately in the circumferential direction. The structures of each magnetic pole 25 are the same except that the N / S ratio on the outer peripheral surface of the rotor section 20 is different and the circumferential position is different.

[0042] The three magnets 27, 28, and 29 constituting a magnetic pole 25 are classified as an outer magnet 27 and a pair of inner magnets 28 and 29. The outer magnet 27 is positioned at the portion corresponding to the base of an isosceles triangle when viewed axially. The outer magnet 27 is positioned at the radially outer end of the isosceles triangle and extends circumferentially. The pair of inner magnets 28 and 29 are positioned at the portions corresponding to the two sides (equilateral sides) of the isosceles triangle when viewed axially. The pair of inner magnets 28 and 29 are positioned radially inner to the outer magnet 27. The magnet 28 on the other circumferential side (-θ side) of the pair of inner magnets 28 and 29 is located radially inner as it faces the circumferential side (+θ side). The magnet 29 on the other circumferential side (+θ side) of the pair of inner magnets 28 and 29 is located radially outer as it faces the circumferential side (+θ side).

[0043] In this embodiment, the magnetic pole 25 is described as being composed of three magnets 27, 28, and 29, with each magnet 27, 28, and 29 arranged in an isosceles triangle shape. However, the magnetic pole can also be composed of one or more magnets arranged in various shapes, as long as the multiple magnetic poles have the same structure.

[0044] Next, based on Figure 4 and Figure 5 The relative arrangement of the first rotor section 20A and the second rotor section 20B, which are stacked adjacent to each other, will be described. Here, in the first rotor section 20A and the second rotor section 20B, we will focus on a magnetic pole 25 and a through hole 21 arranged on the other side (-θ side) in the circumferential direction relative to these magnetic poles 25. However, the other magnetic poles 25 and the through holes 21 have the same structure.

[0045] In the following description, the magnetic pole 25 of the first rotor section 20A is referred to as the first magnetic pole 25A, and the magnetic pole 25 of the second rotor section 20B is referred to as the second magnetic pole 25B. Furthermore, viewed axially, an imaginary line passing through the center axis J and the center of the circumference of the first magnetic pole 25A is referred to as the first magnetic pole center line L1, and an imaginary line passing through the center axis J and the center of the circumference of the second magnetic pole 25B is referred to as the second magnetic pole center line L2. In addition, the first magnetic pole center line L1 and the second magnetic pole center line L2 can be provided in each rotor 30 in the same number as the number of magnetic poles 25, but here only one magnetic pole center line L1 and L2 are considered for each rotor 30.

[0046] In this embodiment, the rotor 30 is provided with a stepping skew. That is, the first rotor section 20A and the second rotor section 20B are offset from each other in the circumferential direction and are stacked in the axial direction. Therefore, the magnetic poles 25 of the first rotor section 20A are offset from the magnetic poles 25 of the second rotor section 20B in the circumferential direction (+θ side). Here, the angle of circumferential offset between the first rotor section 20A and the second rotor section 20B is defined as the skew angle. Twist angle It is the angle between the center line L1 of the first magnetic pole and the center line L2 of the second magnetic pole.

[0047] like Figure 4 As shown, when the first rotor section 20A is viewed axially, the imaginary line passing through the center axis J and the center of the first through hole 21A is called the first through hole center line P1. The first through hole center line P1 is located on the other side (-θ side) circumferentially opposite to the first magnetic pole center line L1. The first through hole center line P1 and the first magnetic pole center line L1 form a first angle α1. That is, in the first rotor section 20A, the center of the first through hole 21A is located at a position offset by a first angle α1 from the magnetic pole 25 (first magnetic pole 25A) of the first rotor section 20A to the other side (-θ side) circumferentially.

[0048] like Figure 5 As shown, when viewing the second rotor section 20B axially, the imaginary line passing through the center axis J and the center of the second through hole 21B is called the second through hole center line P2. The second through hole center line P2 is positioned on the other side (-θ side) circumferentially opposite to the second magnetic pole center line L2. The second through hole center line P2 and the second magnetic pole center line L2 form a second angle α2. That is, in the second rotor section 20B, the center of the second through hole 21B is positioned at a position offset by a second angle α2 from the magnetic pole 25 (second magnetic pole 25B) of the second rotor section 20B circumferentially to the other side (-θ side).

[0049] In this embodiment, the second angle α2 is greater than the first angle α1. Therefore, the first through hole 21A and the second through hole 21B can be staggered in a direction that eliminates the misalignment of the first rotor portion 20A and the second rotor portion 20B in the circumferential direction (+θ side) caused by the stepping skew of the rotor 30. This reduces the circumferential misalignment of the through holes 21 at the boundary portions of each rotor portion 20. According to this embodiment, it is easy to arrange the through holes 21 of the plurality of rotor portions 20 in a straight line along the axial direction. For example, when using the plurality of axially connected through holes 21 as a flow path for refrigerant O, it is possible to suppress the increase in pipe resistance at the boundary portions of the rotor portions 20, allowing the refrigerant O to flow smoothly.

[0050] In this embodiment, either the first angle α1 or the second angle α2 can be 0°. However, to clearly define the relationship between the magnitudes of the first angle α1 and the second angle α2, both angles α1 and α2 must be positive angles. That is, both angles α1 and α2 are angles greater than or equal to 0°. Furthermore, when the first angle α1 is 0°, the center line L1 of the first magnetic pole overlaps with the center line P1 of the first through hole. When the second angle α2 is 0°, the center line L2 of the second magnetic pole overlaps with the center line P2 of the second through hole.

[0051] Figure 6 This is a schematic cross-sectional view of the rotor 30 along the axial direction in this embodiment. Multiple rotor sections 20 are fixed to the outer peripheral surface of the shaft 31. Specifically, the first rotor section 20A and the second rotor section 20B are fixed to the outer peripheral surface of the shaft 31. The first rotor section 20A and the second rotor section 20B are opposite to each other and in contact at the boundary section 32.

[0052] According to this embodiment, at the boundary 32 between the first rotor portion 20A and the second rotor portion 20B, the opening 21Aa of the first through hole 21A and the opening 21Ba of the second through hole 21B overlap when viewed from the axial direction. According to this embodiment, the internal space of the first through hole 21A and the internal space of the second through hole 21B can communicate at the boundary 32.

[0053] like Figure 4 and Figure 5 As shown, in this embodiment, the difference (α2-α1) between the first angle α1 and the second angle α2 is related to the twist angle between the first rotor section 20A and the second rotor section 20B. Consistent. That is, in this embodiment, the first angle α1, the second angle α2, and the tilt angle are consistent. The following formula is satisfied.

[0054] By satisfying the above formula, the center line P1 of the first through hole and the center line P2 of the second through hole are aligned when the rotor 30 of this embodiment is viewed from the axial direction. Therefore, it is easy to arrange the first through hole 21A and the second through hole 21B in a straight line.

[0055] In this embodiment, the distance between the first through hole 21A and the central axis J, and the distance between the second through hole 21B and the central axis J, are equal. Therefore, in this embodiment, the center of the first through hole 21A and the center of the second through hole 21B coincide when viewed from the axial direction. As a result, the first through hole 21A and the second through hole 21B can be arranged in a straight line along the axial direction, and the formation of a step between the first through hole 21A and the second through hole 21B at the boundary between the rotor portions 20 can be suppressed.

[0056] Furthermore, in this embodiment, the first through hole 21A and the second through hole 21B have the same shape when viewed from the axial direction. Therefore, at the boundary between the first rotor portion 20A and the second rotor portion 20B, the opening 21Aa of the first through hole 21A and the opening 21Ba of the second through hole 21B are aligned when viewed from the axial direction. As a result, no step is generated between the first through hole 21A and the second through hole 21B at the boundary between the rotor portions 20. When the through hole 21 is used as a refrigerant flow path, the increase in pipe resistance at the boundary between the first through hole 21A and the second through hole 21B can be suppressed. Furthermore, when assembling the rotor 30 by stacking the first rotor portion 20A and the second rotor portion 20B, a jig penetrating the first through hole 21A and the second through hole 21B can be used to circumferentially align the first rotor portion 20A and the second rotor portion 20B.

[0057] like Figure 3 As shown, the spacer 38 is a non-magnetic ring-shaped plate centered on the central axis J, and in this embodiment, it is a circular ring plate. The axial dimension, i.e., the plate thickness, of the spacer 38 is larger than the thickness of each of the plurality of electromagnetic steel plates in the rotor section 20.

[0058] The spacer 38 has a spacer flow path 96. The spacer flow path 96 is formed as a concave shape that is recessed radially outward from the inner circumferential surface of the spacer 38. The spacer flow path 96 is open on the inner circumferential surface of the spacer 38 but not on the outer circumferential surface. The spacer flow path 96 connects the refrigerant supply hole 33 to the through hole 21. The hollow portion 31h of the shaft 31 is connected to the through hole 21 (i.e., the first through hole 21A and the second through hole 21B) via the refrigerant supply hole 33. According to this embodiment, the refrigerant O flowing in the shaft 31 is supplied from the refrigerant supply hole 33 to the through hole 21 of the rotor core 26 by centrifugal force or the like through the spacer flow path 96. The rotor 30 is cooled by the refrigerant O flowing through the through hole 21. Since the temperature rise of the rotor 30 can be suppressed, inexpensive magnets 27, 28, 29, etc., whose upper limit of operating temperature is not too high, can be used, thus expanding the range of choices for components constituting the rotor 30. Furthermore, the spacer 38 in this embodiment is different from, for example, the electromagnetic steel plate constituting the rotor core 26. Its thickness and shape of the spacer flow path 96 can be changed arbitrarily, and the design changes are also easy. That is, the shape has a high degree of freedom, so it can easily meet the requirements of various rotary motors 10.

[0059] The spacer flow path 96 extends axially through the spacer 38. In this case, the spacer 38 can have a simple structure, and refrigerant O can be supplied from the spacer flow path 96 to the through hole 21 of the rotor core 26 located on one axial side of the spacer 38 and the through hole 21 of the rotor core 26 located on the other axial side of the spacer 38, respectively, enabling large-scale and uniform cooling of the rotor 30 in the axial direction. Multiple spacer flow path sections 96 are provided circumferentially spaced apart on the spacer 38. In this embodiment, eight spacer flow path sections 96 are provided circumferentially at equal intervals on the spacer 38.

[0060] The end plate 39 is an annular plate centered on the central axis J, and in this embodiment, it is a circular annular plate. A pair of end plates 39 are provided at both ends of the laminate composed of multiple rotor sections 20 along the axial direction. The pair of end plates 39 contact the rotor core 26 located on one side of the axial direction and the rotor core 26 located on the other side of the axial direction from the axial direction. The end plates 39 are axially opposite to the rotor core 26 from the side opposite to the spacer 38.

[0061] The end plate 39 has a guide flow path 97 communicating with the through hole 21. The guide flow path 97 has a circumferential flow path 97a, a radial flow path 97b, and a connecting flow path 97c. The circumferential flow path 97a is recessed axially from the surface of the end plate 39 opposite to the rotor core 26, forming a groove extending circumferentially. The circumferential flow path 97a is formed in an annular shape centered on the central axis J. The circumferential flow path 97a is opposite to the through hole 21 in the axial direction. The circumferential flow path 97a communicates with a plurality of through holes 21 arranged circumferentially on the rotor core 26 opposite to the end plate 39.

[0062] The radial flow path 97b is a groove-shaped portion that is axially recessed from the end plate 39 toward the surface opposite to the rotor core 26 and extends radially. The radial flow path 97b opens on the outer peripheral surface of the end plate 39. That is, the radial flow path 97b opens radially outward. A plurality of radial flow path portions 97b are provided at intervals in the circumferential direction. The number of radial flow path portions 97b is, for example, the same as the number of through holes 21 had by the rotor core 26 opposite to the end plate 39, which is eight in this embodiment.

[0063] The connecting flow path 97c is a hole-shaped portion that extends axially through the end plate 39. The connecting flow path 97c connects the circumferential flow path 97a and the radial flow path 97b. In this embodiment, the connecting flow path 97c opens at the radially outer end of the circumferential flow path 97a and the radially inner end of the radial flow path 97b. Multiple connecting flow path portions 97c are provided at intervals in the circumferential direction. The number of connecting flow path portions 97c is the same as the number of radial flow path portions 97b, and in this embodiment, for example, there are eight.

[0064] The flow path 97 guides the refrigerant O flowing into the flow path 97 from the through hole 21 to the coil 42c of the stator 40 (described later). Figure 1 According to this embodiment, by using refrigerant O that flows through the through hole 21 and cools the rotor 30, the coil 42c can be further cooled, thereby improving the cooling efficiency.

[0065] like Figure 1 As shown, the stator 40 and rotor 30 are radially opposed with a gap between them. The stator 40 surrounds the rotor 30 circumferentially from the radially outer side. The stator 40 is fixed inside the motor housing 81. The stator 40 has a stator core 41 and a coil assembly 42.

[0066] The stator core 41 has an annular shape surrounding the central axis J of the rotary motor 10. The stator core 41 is constructed, for example, by stacking multiple plate components such as electromagnetic steel plates axially. The coil assembly 42 has multiple coils 42c mounted circumferentially on the stator core 41. The multiple coils 42c are respectively mounted on each tooth (not shown) of the stator core 41 via an insulator (not shown). The multiple coils 42c are arranged circumferentially. The coils 42c have portions protruding axially from the stator core 41.

[0067] A refrigerant flow path 90 is provided within the housing 80. Refrigerant O flows in the refrigerant flow path 90. The refrigerant flow path 90 is configured to span the interior of the motor housing 81 and the interior of the gear housing 82. The refrigerant flow path 90 is a path that supplies refrigerant O stored in the gear housing 82 to the rotary motor 10 within the motor housing 81 and then returns it to the gear housing 82. A pump 71 and a cooler 72 are provided on the refrigerant flow path 90. The refrigerant flow path 90 has a first flow path section 91, a second flow path section 92, a third flow path section 93, a stator refrigerant supply section 50, an axial flow path section 95, a connecting flow path section 94, a spacer flow path section 96, a through-hole flow path section 98, and a guide flow path section 97.

[0068] The first flow path 91, the second flow path 92, and the third flow path 93 are, for example, provided on the wall of the gear housing 82. The first flow path 91 connects the portion of the gear housing 82 where refrigerant O is stored to the pump 71. The second flow path 92 connects the pump 71 to the cooler 72. The third flow path 93 connects the cooler 72 and the stator refrigerant supply unit 50. In this embodiment, the third flow path 93 is connected to the left end of the stator refrigerant supply unit 50, i.e., the upstream portion of the stator refrigerant supply unit 50.

[0069] The stator refrigerant supply section 50 supplies refrigerant O to the stator 40. In this embodiment, the stator refrigerant supply section 50 is a tubular structure extending axially. In other words, in this embodiment, the stator refrigerant supply section 50 is a tube extending axially. The two axial ends of the stator refrigerant supply section 50 are supported by the motor housing 81. The left end of the stator refrigerant supply section 50 is supported, for example, by a partition wall 81b. The right end of the stator refrigerant supply section 50 is supported, for example, by a cover portion 81c. The stator refrigerant supply section 50 is located radially outward of the stator 40. In this embodiment, the stator refrigerant supply section 50 is located on the upper side of the stator 40.

[0070] The stator refrigerant supply section 50 has a supply port 50a for supplying refrigerant O to the stator 40. In this embodiment, the supply port 50a is an injection port that sprays a portion of the refrigerant O flowing into the stator refrigerant supply section 50 outwards. The supply port 50a is formed by a hole that penetrates the wall of the stator refrigerant supply section 50 from the inner peripheral surface to the outer peripheral surface. Multiple supply ports 50a are provided in the stator refrigerant supply section 50. These multiple supply ports 50a are arranged at intervals, for example, in the axial or circumferential direction.

[0071] like Figure 3 As shown, the axial flow path 95 is disposed in the hollow portion 31h within the shaft 31. The axial flow path 95 includes the inner circumferential surface of the shaft 31, the refrigerant guide portion 31a, and the refrigerant supply hole 33. Figure 1 As shown, the connecting flow path 94 connects the interior of the stator refrigerant supply section 50 to the interior of the shaft 31. The connecting flow path 94 connects the right end (downstream portion) of the stator refrigerant supply section 50 and the right end (upstream portion) of the shaft flow path 95. The connecting flow path 94 is provided, for example, on the cover portion 81c. According to this embodiment, the structure of the refrigerant flow path 90 can be simplified, and the stator 40 and rotor 30 can be cooled stably.

[0072] The through-hole flow path 98 connects the spacer flow path 96 and the guide flow path 97. The through-hole flow path 98 is arranged throughout the interior of the plurality of rotor cores 26.

[0073] like Figure 1 As shown, when the pump 71 is driven, the refrigerant O accumulated in the gear housing 82 is drawn up through the first flow path 91 and flows into the cooler 72 through the second flow path 92. After being cooled in the cooler 72, the refrigerant O flows to the stator refrigerant supply section 50 through the third flow path 93. A portion of the refrigerant O flowing into the stator refrigerant supply section 50 is ejected from the supply port 50a and supplied to the stator 40. Another portion of the refrigerant O flowing into the stator refrigerant supply section 50 flows into the axial flow path section 95 through the connecting flow path section 94. A portion of the refrigerant O flowing in the axial flow path section 95 flows from the refrigerant supply hole 33 through the spacer flow path section 96, the through hole flow path section 98, and the guide flow path section 97, and disperses towards the stator 40. Another portion of the refrigerant O flowing into the axial flow path section 95 is discharged into the interior of the gear housing 82 from the opening on the left side of the shaft 31 and accumulates again in the gear housing 82.

[0074] The refrigerant O supplied from the supply port 50a to the stator 40 absorbs heat from the stator 40, and the refrigerant O supplied from inside the shaft 31 to the rotor 30 and stator 40 absorbs heat from the rotor 30 and stator 40. The refrigerant O that has cooled the stator 40 and rotor 30 falls downwards and remains in the lower region of the motor housing 81. The refrigerant O remaining in the lower region of the motor housing 81 returns to the gear housing 82 through the partition wall opening 81d provided on the partition wall 81b. As described above, the refrigerant flow path 90 supplies the refrigerant O accumulated in the gear housing 82 to the rotor 30 and stator 40.

[0075] like Figure 1 As shown, the rotor 30 of this embodiment has a flow path (spacer flow path 96) that connects to the through holes 21 of each rotor section 20 along its entire axial length. Other structures include... Figure 8 As shown, the rotor 30 may also have a flow path 97A connecting one end of the rotor 30 along its axial direction to the through hole 21 (i.e., the first through hole 21A or the second through hole 21B). Furthermore, in this embodiment, the rotor 30 extends horizontally and is centered on the central axis J. However, the rotor 30 may also be centered on a central axis extending vertically. In this case, a structure can be used where refrigerant O or the like is dripped from above to introduce refrigerant O into the through hole 21 of the rotor 30.

[0076] Figure 7 This is a cross-sectional schematic diagram of the rotor 30 according to this embodiment, showing the positional relationship between the first through hole 21A and the second through hole 21B and the magnet. In this embodiment, the positional relationship between the first magnetic pole 25A and the first through hole 21A and the positional relationship between the second magnetic pole 25B and the second through hole 21B are different.

[0077] In the first rotor section 20A, a first distance d1 is defined between the first through hole 21A and the magnet 29 closest to the first through hole 21A. Similarly, in the second rotor section 20B, a second distance d2 is defined between the second through hole 21B and the magnet 29 closest to the second through hole 21B. In this embodiment, the second distance d2 is less than the first distance d1. Thus, according to this embodiment, a structure is adopted in which the distance between the through hole 21 and the magnet 29 is different for each rotor section 20.

[0078] Variations Hereinafter, various modifications that can be used in the above embodiments will be described. In each modified example, the circumferential positional relationship between the first through hole and the second through hole is the same as in the embodiment described above. However, in each modified example, the rotor differs from the embodiment described above in the shape of either or both of the first and second through holes. In the various modifications described below, the same symbols are used for the constituent elements that are the same as those in the already described embodiments or modifications, and their descriptions are omitted.

[0079] (Variation Example 1) Figure 9 This is a cross-sectional schematic diagram of rotor 130 of variant example 1. In this modified example, the first through hole 121A of the first rotor portion 120A is formed into a cone shape whose diameter decreases as it approaches the boundary portion 132 of the second rotor portion 120B (i.e., the axial side (-Y side)). When the refrigerant O flows from the first through hole 121A to the second through hole 121B, the flow rate of the refrigerant O through the first through hole 121A increases as it approaches the second through hole 121B.

[0080] At the boundary 132 between the first rotor section 120A and the second rotor section 120B, the opening 121Aa of the first through hole 121A and the opening 121Ba of the second through hole 121B are aligned when viewed from the axial direction. Therefore, no step is generated between the first through hole 121A and the second through hole 121B at the boundary 132 between the rotor sections 120, and the increase in pipeline resistance at the boundary 132 can be suppressed.

[0081] (Variation Example 2) Figure 10 This is a cross-sectional schematic diagram of rotor 230 of variant example 2. In this modified example, the cross-sectional area of ​​the first through hole 221A is smaller than that of the second through hole 221B. The first through hole 221A and the second through hole 221B are circular, for example, when viewed axially. The diameter of the first through hole 221A is smaller than the diameter of the second through hole 221B.

[0082] At the boundary 232 between the first rotor section 220A and the second rotor section 220B, viewed axially, the opening 221Aa of the first through hole 221A is contained within the opening 221Ba of the second through hole 221B. Therefore, when refrigerant O flows from the first through hole 221A to the second through hole 221B, no step surface opposing the flow of refrigerant O is generated at the boundary 232. According to this modified example, the increase in pipe resistance at the boundary 232 can be suppressed.

[0083] (Variation Example 3) Figure 11 This is a cross-sectional schematic diagram of rotor 330 of variant example 3. In this modified example, the number of first through holes 321A provided in the first rotor portion 320A is greater than the number of second through holes provided in the second rotor portion 320B. Furthermore, the cross-sectional area of ​​each first through hole 321A is smaller than the cross-sectional area of ​​each second through hole 321B. The first through holes 321A and second through holes 321B are, for example, circular when viewed axially. The diameter of the first through hole 321A is smaller than the diameter of the second through hole 321B.

[0084] At the boundary 332 between the first rotor section 320A and the second rotor section 320B, the openings 321Aa of the plurality of (three) first through holes 321A are contained, when viewed axially, within the opening 321Ba of a second through hole 321B. Therefore, when refrigerant O flows from the first through hole 321A to the second through hole 321B, no step surface opposite to the flow of refrigerant O is generated at the boundary 332. According to this modified example, the increase in pipe resistance at the boundary 332 can be suppressed.

[0085] (Variation Example 4) Figure 12 This is a top view of the rotor 430 of variant example 4, showing the first through hole 421A of the first rotor portion 420A and the second through hole 421B of the second rotor portion 420B.

[0086] At the boundary between the first rotor section 420A and the second rotor section 420B, the opening shapes of the first through hole 421A and the second through hole 421B are different. The first through hole 421A is approximately rectangular when viewed axially. On the other hand, the second through hole 421B is circular when viewed axially. Here, "approximately rectangular" refers to a rectangular shape with smoothly curved corners. The cross-sectional shapes of the first through hole 421A and the second through hole 421B are the same along their entire axial length. The centers of the first through hole 421A and the second through hole 421B coincide when viewed axially. The cross-sectional area of ​​the first through hole 421A is smaller than that of the second through hole 421B.

[0087] When viewed axially, the first through hole 421A is included within the second through hole 421B. That is, at the boundary between the first rotor portion 420A and the second rotor portion 420B, when viewed axially, the opening of the first through hole 421A is included within the opening of the second through hole 421B. Therefore, when refrigerant O flows from the first through hole 421A to the second through hole 421B, no stepped surface opposite to the flow of refrigerant O is generated at the boundary. According to this modified example, even when the shapes of the first through hole 421A and the second through hole 421B are different, the increase in pipe resistance at the boundary can be suppressed.

[0088] (Variation Example 5) Figure 13 This is a top view of the rotor 530 of Modified Example 5, showing the first through hole 521A of the first rotor portion 520A and the second through hole 521B of the second rotor portion 520B.

[0089] At the boundary between the first rotor section 520A and the second rotor section 520B, the opening shapes of the first through hole 521A and the second through hole 521B are different. The first through hole 521A is approximately rectangular when viewed axially. On the other hand, the second through hole 521B is circular when viewed axially. The cross-sectional shapes of the first through hole 521A and the second through hole 521B are the same along their entire axial length. The centers of the first through hole 521A and the second through hole 521B coincide when viewed axially. The cross-sectional area of ​​the first through hole 521A is smaller than that of the second through hole 521B.

[0090] When viewed axially, the first through hole 521A and the second through hole 521B overlap. A portion of the outer shape of the first through hole 521A protrudes outward relative to the outer shape of the second through hole 521B. Similarly, a portion of the outer shape of the second through hole 521B protrudes outward relative to the outer shape of the first through hole 521A. According to this modification, a stepped portion is formed at the boundary between the first through hole 521A and the second through hole 521B. Therefore, in the rotor 530 of this modification, although some turbulence is generated in the refrigerant O at the boundary between the first through hole 521A and the second through hole 521B, the refrigerant O can flow smoothly because the center of the first through hole 521A coincides with the center of the second through hole 521B. According to this modification, even when the shapes of the first through hole 521A and the second through hole 521B are different, the increase in pipe resistance at the boundary can be suppressed.

[0091] (Variation Example 6) Figure 14 This is a cross-sectional schematic diagram of rotor 630 of variant example 6. In this modified example, the first through hole 621A of the first rotor portion 620A is formed into a cone shape whose diameter decreases towards the boundary portion 632 of the second rotor portion 620B. Similarly, the second through hole 621B of the second rotor portion 620B is formed into a cone shape whose diameter decreases away from the boundary portion 632 of the first rotor portion 620A. Therefore, the cross-sectional area of ​​the first through hole 621A and the second through hole 621B, which are connected axially, decreases as they move from one axial side (+Y side) towards the other (-Y side). When refrigerant O flows from the first through hole 621A to the second through hole 621B, the flow rate of refrigerant O through the first through hole 621A and the second through hole 621B increases as it moves towards the axial side (-Y side).

[0092] At the boundary 632 between the first rotor section 620A and the second rotor section 620B, the opening 621Aa of the first through hole 621A and the opening 621Ba of the second through hole 621B are aligned when viewed from the axial direction. Therefore, no step is generated between the first through hole 621A and the second through hole 621B at the boundary 632 between the rotor sections 620, and the increase in pipeline resistance at the boundary 632 can be suppressed.

[0093] In the first rotor section 620A, a first distance d1 is defined between the first through hole 621A and the magnet 29 closest to the first through hole 621A. Similarly, in the second rotor section 620B, a second distance d2 is defined between the second through hole 621B and the magnet 29 closest to the second through hole 621B. Similar to the above embodiment, the second distance d2 is less than the first distance d1.

[0094] As described above, in the rotor 630 of this modified example, the flow path cross-sectional area gradually decreases from the first through hole 621A toward the second through hole 621B. Therefore, the flow rate of refrigerant O through the first rotor section 620A is lower than the flow rate of refrigerant O through the second rotor section 620B. The refrigerant O inside the rotor 630 of this modified example is in contact with the first rotor section 620A for a longer period than that inside the second rotor section 620B. The refrigerant O absorbs more heat from the first rotor section 620A than from the second rotor section 620B.

[0095] On the other hand, according to the rotor 630 of this modification, the second distance d2 is smaller than the first distance d1. Therefore, in the second rotor section 620B, the magnet 29 is more easily cooled by the refrigerant O compared to the first rotor section 620A. According to this modification, in the first rotor section 620A where the distance between the magnet 29 and the first through hole 621A is greater, the flow rate of the refrigerant O can be reduced, while in the second rotor section 620B where the distance between the magnet 29 and the second through hole 621B is smaller, the flow rate of the refrigerant O can be increased. As a result, the cooling efficiency of each magnet 29 in the first rotor section 620A and the second rotor section 620B can be well balanced, and the rotor 630 as a whole can be cooled uniformly, thus suppressing temperature deviations.

[0096] (Variation Example 7) Figure 15 This is a cross-sectional schematic diagram of the rotor 730 of variant example 7. In this modified example, the axial dimension D1 of the first rotor portion 720A is larger than the axial dimension D2 of the second rotor portion 720B. The first through hole 721A of the first rotor portion 720A and the second through hole 721B of the second rotor portion 720B have the same shape when viewed axially. At the boundary 732 between the first rotor portion 720A and the second rotor portion 720B, the opening 721Aa of the first through hole 721A and the opening 721Ba of the second through hole 721B are identical when viewed axially.

[0097] In the first rotor section 720A, a first distance d1 is defined between the first through hole 721A and the magnet 29 closest to the first through hole 721A. Similarly, in the second rotor section 720B, a second distance d2 is defined between the second through hole 721B and the magnet 29 closest to the second through hole 721B. Similar to the above embodiment, the second distance d2 is less than the first distance d1.

[0098] In the rotor 730 of this modified example, the total length (i.e., axial dimension D1) of the first through hole 721A is longer than the total length (i.e., axial dimension D2) of the second through hole 721B. The refrigerant O passing through the interior of the rotor 730 of this modified example is in contact with the first rotor portion 720A for a longer period than the second rotor portion 720B. Therefore, the refrigerant O absorbs more heat from the first rotor portion 720A than from the second rotor portion 720B.

[0099] On the other hand, according to the rotor 730 of this modification, the second distance d2 is smaller than the first distance d1. Therefore, in the second rotor section 720B, the magnet 29 is more easily cooled by the refrigerant O compared to the first rotor section 720A. According to this modification, in the first rotor section 720A where the distance between the magnet 29 and the first through hole 721A is greater, the flow path length of the refrigerant O can be longer, and in the second rotor section 720B where the distance between the magnet 29 and the second through hole 721B is closer, the flow path length of the refrigerant O can be shorter. As a result, the cooling efficiency of each magnet 29 in the first rotor section 720A and the second rotor section 720B can be well balanced, and the rotor 730 as a whole can be cooled uniformly, thus suppressing temperature deviations.

[0100] The above describes the embodiments and variations of the present invention. However, each structure and combination in each embodiment and variation is merely an example, and additions, omissions, substitutions, and other changes to the structure can be made without departing from the spirit of the present invention. Furthermore, the present invention is not limited to the embodiments and variations.

[0101] The rotary motor using this invention is not limited to a motor, but can also be a generator. The application of the rotary motor is not particularly limited. For example, the rotary motor can be mounted on a vehicle for purposes other than rotating an axle, or it can be mounted on equipment outside of a vehicle. The posture when using the rotary motor is not particularly limited.

Claims

1. A rotor, which is the rotor of a rotary electric motor that rotates around a central axis, characterized in that, It includes a first rotor section and a second rotor section that are staggered in the circumferential direction and stacked in the axial direction. The first rotor section has: A first rotor core having a first through hole extending axially; and The first magnet is held in the first rotor core. The second rotor section has: A second rotor core having a second through hole extending axially; and The second magnet is held in the second rotor core. The magnetic poles of the first rotor section are offset from the magnetic poles of the second rotor section in a circumferential direction. In the first rotor section, the center of the first through hole is positioned at a position offset by a first angle from the magnetic pole of the first rotor section circumferentially to the other side. In the second rotor section, the center of the second through hole is positioned at a position offset by a second angle from the magnetic pole of the second rotor section circumferentially to the other side. The second angle is greater than the first angle. At the boundary between the first rotor section and the second rotor section, when viewed axially, the opening of the first through hole overlaps with the opening of the second through hole. The distance between the second through hole and the second magnet closest to the second through hole is less than the distance between the first through hole and the first magnet closest to the first through hole. The first through hole and the second through hole allow refrigerant to flow through. The refrigerant flows from the first through hole to the second through hole.

2. The rotor according to claim 1, characterized in that, The difference between the first angle and the second angle is consistent with the torsion angle of the first rotor section and the second rotor section.

3. The rotor according to claim 1 or 2, characterized in that, When viewed axially at the boundary between the first rotor section and the second rotor section, the opening of the first through hole and the opening of the second through hole coincide with each other.

4. The rotor according to claim 1 or 2, characterized in that, At the boundary between the first rotor portion and the second rotor portion, when viewed from the axial direction, the opening of the first through hole is contained within the opening of the second through hole.

5. The rotor according to claim 4, characterized in that, A plurality of first through holes are provided on the first rotor core. At the boundary between the first rotor portion and the second rotor portion, when viewed axially, the openings of the plurality of first through holes are contained within the opening of a second through hole.

6. The rotor according to claim 4, characterized in that, At the boundary between the first rotor section and the second rotor section, the opening shape of the first through hole and the opening shape of the second through hole are different from each other.

7. The rotor according to claim 1 or 2, characterized in that, Including a hollow shaft centered on a central axis, The first rotor section and the second rotor section are fixed to the outer circumferential surface of the shaft. A connecting hole is provided on the shaft, extending radially outward from the hollow portion. The hollow portion of the shaft is connected to the first through hole and the second through hole via the connecting hole.

8. The rotor according to claim 1 or 2, characterized in that, It has a flow path that connects to the first through hole or the second through hole from one end of the rotor on one side or the other side of the axial direction.

9. The rotor according to claim 1 or 2, characterized in that, A first magnet storage hole is provided on the first rotor core for inserting the first magnet. The second rotor core is provided with a second magnet storage hole for inserting the second magnet. The first through hole and the first magnet receiving hole are arranged circumferentially. The second through hole and the second magnet receiving hole are arranged circumferentially.

10. A rotary electric motor, characterized in that, include: The rotor according to any one of claims 1 to 9; and The stator surrounds the rotor from the radial outside.

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