rotor

Abstract

The present invention relates to a rotor. Specifically, the present invention relates to a rotor of a motor, the rotor including: a shaft; a rotor core having a plurality of core blocks, each of the core blocks including a plurality of magnets and a refrigerant flow passage, the core blocks including a first core block and a second core block; and at least one plate including a refrigerant communication plate disposed between the first core block and the second core block, and the refrigerant communication plate including a communication flow passage configured to connect the refrigerant flow passage of the first core block with the refrigerant flow passage of the second core block.

Description

Technical Field

[0001] The technology disclosed in this specification relates to a rotor. Herein, "rotor" is a component of an electric motor (hereinafter also simply referred to as "motor"). Background Technology

[0002] Japanese Unexamined Patent Application Publication No. 2015-177706 (JP 2015-177706A) describes a rotor. This rotor includes a shaft extending in an axial direction, a rotor core having a plurality of core blocks arranged in the axial direction on the outer peripheral surface of the shaft, and a refrigerant supply plate arranged in the axial direction along the outer peripheral surface of the shaft. In each of these core blocks, a plurality of magnets are provided, forming a refrigerant flow channel extending in the axial direction. A refrigerant supply port is provided on the outer peripheral surface of the shaft through which refrigerant is discharged. The refrigerant supply plate is provided with a refrigerant supply flow channel configured to connect the refrigerant supply port of the shaft with the refrigerant flow channel of the core blocks. Summary of the Invention

[0003] In the rotor of the electric motor described above, achieving smooth operation in the low-rotation region requires suppressing cogging torque caused by the magnetic force of magnets disposed in the rotor. One method for suppressing cogging torque is to provide a stepped skew between adjacent core blocks. Here, providing a stepped skew means providing a difference in position (i.e., orientation) between adjacent core blocks in the circumferential direction. Therefore, the magnetic force in the circumferential direction is dispersed, which can suppress the generation of cogging torque.

[0004] However, when a stepped skew is installed between adjacent core blocks, the refrigerant flow channels within those core blocks are also misaligned circumferentially. This can lead to insufficient communication between these core blocks and between the refrigerant flow channels, or even complete disconnection of the refrigerant flow channels. This condition does not allow sufficient refrigerant to flow through the refrigerant flow channels, which may result in insufficient cooling of the rotor core.

[0005] This disclosure provides a technique that allows sufficient refrigerant to flow through refrigerant flow channels in a rotor that is provided with stepped deflection.

[0006] A rotor of a motor according to a first aspect of this disclosure includes: a shaft extending axially; a rotor core having a plurality of core blocks disposed on an outer peripheral surface of the shaft and arranged along the axial direction, each core block including a plurality of magnets and a refrigerant flow channel extending along the axial direction, the core block including a first core block and a second core block disposed at a stepped offset relative to the first core block; and at least one plate disposed on the outer peripheral surface of the shaft and arranged together with the core blocks along the axial direction, the at least one plate including a refrigerant connecting plate disposed between the first core block and the second core block, the refrigerant connecting plate including a connecting flow channel configured to connect the refrigerant flow channels of the first core block and the refrigerant flow channels of the second core block.

[0007] In this configuration, a refrigerant connecting plate is positioned between a first core block and a second core block, which are provided with stepped deflections. The refrigerant connecting plate has connecting flow channels, through which the refrigerant flow channels of the first core block and the second core block are connected to each other. Therefore, refrigerant is allowed to flow smoothly through the refrigerant flow channels, which are also provided with stepped deflections in the rotor.

[0008] In the rotor described above, each of the core blocks is provided with a magnet slot, the magnet slot extending along the axial direction and accommodating at least one of the magnets; the refrigerant flow channel is located inside the magnet slot and is defined between the outer surface of the magnet and the inner surface of the magnet slot.

[0009] In this configuration, refrigerant is allowed to flow through the interior of the magnet slot that houses the magnet. Therefore, the magnets located in each core block can be directly cooled by the refrigerant.

[0010] In the rotor described above, the refrigerant connecting plate has a connecting flow channel that extends in an arc shape along the circumferential direction with the rotation axis of the rotor as the center.

[0011] In the rotor described above, the refrigerant connecting plate is made of a non-magnetic material.

[0012] In the rotor described above, the refrigerant connecting plate is made of the same material as the core block.

[0013] In the rotor described above, a refrigerant supply port is provided on the outer peripheral surface of the shaft, through which the refrigerant is discharged; the at least one plate further includes a refrigerant supply plate, which is disposed adjacent to the first core block; the refrigerant supply plate is provided with a refrigerant supply flow channel, which is configured to connect the refrigerant supply port of the shaft with the refrigerant flow channel of the first core block.

[0014] In this configuration, refrigerant discharged through the refrigerant supply port of the shaft is supplied to the refrigerant flow channel of the first core block via the refrigerant supply flow channel of the refrigerant supply plate. The refrigerant supplied to the refrigerant flow channel of the first core block is then supplied to the refrigerant flow channel of the second core block via the connecting flow channel of the refrigerant connecting plate. Therefore, the refrigerant supplied from the shaft is allowed to flow smoothly to the first and second core blocks, which are provided with stepped deflections.

[0015] In the rotor described above, the core block further includes a third core block, which is disposed adjacent to the first core block, and the refrigerant supply plate is located between the third core block and the first core block; the refrigerant supply flow channel of the refrigerant supply plate is also configured to connect the refrigerant supply port of the shaft to the refrigerant flow channel of the third core block.

[0016] In the rotor described above, the core block further includes a fourth core block, which is steppedly skewed relative to the third core block; the at least one plate further includes a second refrigerant connecting plate, which is disposed between the third core block and the fourth core block; the second refrigerant connecting plate is provided with a connecting flow channel configured to connect the refrigerant flow channel of the third core block and the refrigerant flow channel of the fourth core block.

[0017] In the rotor described above, the first core block is located at the furthest point on one side of the core block in the axial direction; the at least one plate further includes an end plate, which is adjacent to the first core block and located on the same side of the first core block in the axial direction; the end plate is provided with a refrigerant supply flow channel through which refrigerant is supplied to the refrigerant flow channel of the first core block.

[0018] In the rotor described above, a refrigerant supply port is provided on the outer peripheral surface of the shaft, through which the refrigerant is discharged; the refrigerant supply flow channel of the end plate is configured to connect the refrigerant supply port of the shaft to the refrigerant flow channel of the first core block. Attached Figure Description

[0019] The features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, in which the same reference numerals denote the same elements, and wherein:

[0020] Figure 1 This is a view schematically illustrating the construction of the rotor 2 in Embodiment 1;

[0021] Figure 2A It shows along Figure 1 A cross-sectional view of the first core block 22a of line IIA-IIA;

[0022] Figure 2B It shows along Figure 1 A cross-sectional view of the second core block 22b of line IIB-IIB;

[0023] Figure 3 It is shown Figure 2A A magnified cross-sectional view of part III of the cross-sectional view of the first core block 22a;

[0024] Figure 4 A cross-sectional view of the supply plate 24 of Embodiment 1, viewed from the direction of the rotation axis R, is shown;

[0025] Figure 5 A cross-sectional view of the first connecting plate 26a of Embodiment 1, viewed from the direction of the rotation axis R, is shown;

[0026] Figure 6 This is a schematic view illustrating the construction of the rotor 102 of Embodiment 2; and

[0027] Figure 7 A cross-sectional view of the end plate 130b of Embodiment 2 is shown, viewed from the direction of the rotation axis R. Detailed Implementation

[0028] Example 1

[0029] The rotor 2 of Embodiment 1 will be described with reference to the accompanying drawings. As an example, the rotor 2 of Embodiment 1 is a component of an electric motor and constitutes the rotating body in the electric motor. For example, the electric motor may be a three-phase AC motor. The construction described in Embodiment 1 can be used not only for three-phase AC motors but also for other types of electric motors.

[0030] like Figure 1 , Figure 2A and Figure 2BAs shown, the rotor 2 of Embodiment 1 includes a shaft 10, a rotor core 20, and a pair of end plates 30a and 30b. Here, in this specification, the direction parallel to the rotation axis R of the rotor 2 is defined as the axial direction (direction D1 in the figure); the direction orthogonal to the rotation axis R is defined as the radial direction (direction D2 in the figure); and the direction perpendicular to both the axial and radial directions is defined as the circumferential direction (D3 in the figure).

[0031] Shaft 10 extends along the rotation axis R of rotor 2. Shaft 10 has a axial flow channel 12 through which refrigerant flows. The axial flow channel 12 extends through the interior of shaft 10 along the rotation axis R of rotor 2. Refrigerant is supplied to the axial flow channel 12 from the outside. A pair of keyways 14a, 14b are provided on the outer peripheral surface 10a of shaft 10. Keyways 14a, 14b are formed at opposite positions in the circumferential direction, but are not limited thereto. Keyways 14a, 14b respectively engage with a pair of protrusions 21a, 21b formed on each core block 22. A joint 16 is provided on the outer peripheral surface 10a of shaft 10. The joint 16 protrudes radially from the outer peripheral surface 10a of shaft 10 and positions the end plate 30a and the core block 22 in the axial direction. The specific construction of shaft 10 is not particularly limited.

[0032] The rotor core 20 has a plurality of core blocks 22. The core blocks 22 are disposed on the outer peripheral surface 10a of the shaft 10 and arranged along the axial direction. Each core block 22 includes one side disposed in the axial direction (…). Figure 1 The three core blocks 22a, 22b, and 22c on the right side of the image and the other core block set on the axial direction ( Figure 1 The three core blocks 22d, 22e, and 22f are located on the left side of the image. In the following text, of the three core blocks 22a, 22b, and 22c located on one side in the axial direction, core block 22a located at the center in the axial direction will be referred to as the first core block 22a, and its adjacent core block 22b will be referred to as the second core block 22b. Of the three core blocks 22d, 22e, and 22f located on the other side in the axial direction, core block 22d located at the center in the axial direction will be referred to as the third core block 22d, and its adjacent core block 22e will be referred to as the fourth core block 22e. The number of core blocks 22 is not particularly limited.

[0033] Each core block 22 has a cylindrical shape and is coaxially arranged on the rotation axis R of the rotor 2. Each core block 22 is made of a soft magnetic material, such as a magnet. The specific construction of each core block 22 is not particularly limited. As an example, each core block 22 in Embodiment 1 has a structure of stacked magnet plates.

[0034] Each core 22 is provided with multiple magnet slots 40. As an example, such as Figure 2AAs shown, in the first core block 22a, the magnet slots 40 are arranged in the circumferential direction along the outer peripheral surface 23a of the first core block 22a. Figure 3 As shown, magnets 44 are housed within corresponding magnet slots 40. Each magnet 44 extends in the axial direction. Each magnet 44 is secured in the magnet slot 40 by a bonding layer 42. The bonding layer 42 is formed of an insulating adhesive.

[0035] Within each magnet slot 40, a refrigerant flow channel 46 is defined between the outer surface of the magnet 44 and the inner surface of the magnet slot 40. The refrigerant flow channel 46 also extends in the axial direction. In this configuration, allowing refrigerant to flow through the refrigerant flow channel 46 allows the refrigerant to directly cool the magnet 44 housed within the magnet slot 40. Alternatively, the refrigerant flow channel 46 can be provided independently of the magnet slot 40. That is, in each core block 22, one or more holes defining the refrigerant flow channel 46 can be provided axially, separately from the magnet slot 40.

[0036] like Figure 2B As shown, also in the second core block 22b, a plurality of magnet slots 40 are arranged circumferentially along the outer peripheral surface 23b of the second core block 22b. Within each magnet slot 40, a magnet 44 is accommodated and a refrigerant flow channel 46 is defined. That is, the second core block 22b has the same construction as the first core block 22a. As will be described in detail later, a stepped deflection is provided between the first core block 22a and the second core block 22b. Therefore, the positions of the protrusions 21a, 21b that engage with the keyways 14a, 14b are offset between the first core block 22a and the second core block 22b by an amount corresponding to the angular difference of the stepped deflection. Although not shown, except for the positions of the protrusions 21a, 21b, the other core blocks 22c, 22d, 22e, 22f, besides those described above, have the same construction as the first core block 22a.

[0037] Each core block 22 has a plurality of peripheral grooves 23 disposed in its outer surface. The peripheral grooves 23 are formed to reduce torque ripple in an electric motor constructed using the rotor 2. In the rotor 2 of this embodiment, each core block 22 is provided with four peripheral grooves 23, but is not limited thereto. Each peripheral groove 23 extends in the axial direction.

[0038] Core 22 is provided with stepped skew (also known as "offset skew"). Stepped skew means that two adjacent cores 22 are offset from each other in the circumferential direction. For example, as Figure 2A and Figure 2BAs shown, a stepped offset of angle θ is provided between the first core block 22a and the second core block 22b. That is, the second core block 22b is offset by angle θ from the first core block 22a in the circumferential direction. Therefore, the position of the magnet slot 40 (i.e., the position of the magnet 44 and the position of the refrigerant flow channel 46) is offset by angle θ between the first core block 22a and the second core block 22b. The position of the outer peripheral groove 23 is also offset by angle θ between the first core block 22a and the second core block 22b. For example, as Figure 2A As shown, in the first core block 22a, the outer peripheral groove 23 exists at position C1 in the circumferential direction, and as... Figure 2B As shown, in the second core block 22b, the outer peripheral groove 23 exists at position C2, which is offset by an angle θ from position C1 in the circumferential direction.

[0039] Similarly, a stepped deflection is provided between the second core block 22b and its adjacent core block 22c. A stepped deflection is also provided between the third core block 22d and its adjacent fourth core block 22e. A stepped deflection is also provided between the fourth core block 22e and its adjacent core block 22f. On the other hand, no stepped deflection is provided between the first core block 22a and the third core block 22d. That is, in the rotor 2 of this embodiment, a stepped deflection is provided on one side in the axial direction ( Figure 1 The three core blocks 22a, 22b, and 22c on the right side of the image and the other core block set on the axial direction ( Figure 1 The three core blocks 22d, 22e, and 22f on the left side of the image have a symmetrical structure.

[0040] The core block 22 is pressed in the axial direction by end plates 30a and 30b. End plates 30a and 30b are respectively disposed at both ends of the core block 22 in the axial direction. One end plate 30a is adjacent to the joint 16, and its position in the axial direction is fixed by the joint 16. The other end plate 30b is adjacent to the nut 32. The nut 32 is fastened to the shaft 10 and presses the core block 22 in the axial direction by the other end plate 30b.

[0041] like Figure 1 As shown, the rotor 2 in this embodiment also includes a plurality of plates 24, 26. Plates 24, 26 are disposed on the outer peripheral surface 10a of the shaft 10 and arranged axially together with the core block 22. Plates 24, 26 include a supply plate 24 and a plurality of connecting plates 26. The connecting plates 26 include a first connecting plate 26a, a second connecting plate 26b, a third connecting plate 26c, and a fourth connecting plate 26d. The supply plate 24 and the connecting plates 26 are made of aluminum, which is a non-magnetic material, but are not limited thereto. However, the supply plate 24 and the connecting plates 26 may be made of a soft magnetic material such as magnets. Alternatively, the supply plate 24 and the connecting plates 26 may be made of a non-metallic material such as resin.

[0042] The supply board 24 is positioned between the first core block 22a and the third core block 22d. For example... Figure 4 As shown, a plurality of refrigerant supply flow channels 25 are formed in the supply plate 24. The refrigerant supply flow channels 25 are arranged at regular intervals in the circumferential direction. The refrigerant supply flow channels 25 are configured to connect the axial flow channels 12 provided in the shaft 10 with the refrigerant flow channels 46 provided in the first core block 22a. Therefore, the refrigerant flowing through the axial flow channels 12 is supplied to each refrigerant flow channel 46 of the first core block 22a through the refrigerant supply flow channels 25 of the supply plate 24. Furthermore, the refrigerant supply flow channels 25 are configured to connect the axial flow channels 12 provided in the shaft 10 with the refrigerant flow channels 46 provided in the third core block 22d. Therefore, the refrigerant flowing through the axial flow channels 12 is also supplied to each refrigerant flow channel 46 of the third core block 22d through the refrigerant supply flow channels 25 of the supply plate 24.

[0043] The specific construction of the supply plate 24 is not particularly limited. As an example, in the rotor 2 of this embodiment, a plurality of distribution flow channels 18 extending radially from the shaft flow channel 12 are formed in the shaft 10. Each distribution flow channel 18 extends to the outer peripheral surface 10a of the shaft 10 and forms a plurality of refrigerant supply ports 18a in the outer peripheral surface 10a of the shaft 10. The refrigerant supply flow channels 25 of the supply plate 24 are respectively connected to the refrigerant supply ports 18a of the shaft 10. The downstream end 25a of the refrigerant supply flow channel 25 is located at the position of the refrigerant flow channel 46 facing the first core block 22a and the refrigerant flow channel 46 facing the third core block 22d and is connected to the refrigerant flow channel 46. The supply plate 24 is provided with protrusions 21a and 21b that engage with the keyways 14a and 14b of the shaft 10.

[0044] As described above, the connecting plate 26 includes a first connecting plate 26a, a second connecting plate 26b, a third connecting plate 26c, and a fourth connecting plate 26d. The first connecting plate 26a is disposed between the first core block 22a and the second core block 22b. Figure 5 As shown, the first connecting plate 26a is provided with a plurality of connecting flow channels 27. Each of the connecting flow channels 27 extends in an arc shape in the circumferential direction and is configured to connect the refrigerant flow channel 46 of the first core block 22a with the refrigerant flow channel 46 of the second core block 22b. Here, each connecting flow channel 27 extends in the circumferential direction within an angle θ. This angle θ corresponds to the stepped deflection angle θ between the first core block 22a and the second core block 22b. That is, each connecting flow channel 27 extends from the position facing the refrigerant flow channel 46 of the first core block 22a to the position facing the refrigerant flow channel 46 of the second core block 22b.

[0045] Other connecting plates 26b, 26c, and 26d have the same construction and function. The second connecting plate 26b is disposed between the second core block 22b and another core block 22c connected thereto. The second connecting plate 26b is provided with a connecting flow channel 27, which is configured to connect the refrigerant flow channel 46 of the second core block 22b to the refrigerant flow channel 46 of the other core block 22c. The third connecting plate 26c is disposed between the third core block 22d and the fourth core block 22e. The third connecting plate 26c is provided with a connecting flow channel 27, which is configured to connect the refrigerant flow channel 46 of the third core block 22d to the refrigerant flow channel 46 of the fourth core block 22e. The fourth connecting plate 26d is disposed between the fourth core block 22e and another adjacent core block 22f. The fourth connecting plate 26d is provided with a connecting flow channel 27, which is configured to connect the refrigerant flow channel 46 of the fourth core block 22e with the refrigerant flow channel 46 of another core block 22f.

[0046] As described above, in the rotor 2 of this embodiment, a connecting plate 26 is disposed between two core blocks 22 arranged in a stepped skew configuration. Each connecting plate 26 is provided with a connecting flow channel 27, through which the refrigerant flow channels 46 of the two core blocks 22 are connected. Therefore, also in the rotor 2 with stepped skew configuration, sufficient refrigerant is allowed to flow smoothly through the refrigerant flow channel 46. The refrigerant flowing through the refrigerant flow channel 46 reaches each of the end plates 30a and 30b, is discharged through the discharge ports (not shown) provided in the end plates 30a and 30b, and can be supplied to, for example, the coil ends of the stator.

[0047] In the rotor 2 of this embodiment, the connecting flow channel 27 of the connecting plate 26 extends in an arc shape in the circumferential direction. In this configuration, the centrifugal force attributable to the rotation of the rotor 2 acts perpendicularly on the flow of refrigerant in the connecting flow channel 27, which allows the refrigerant to flow smoothly through the connecting flow channel 27 without being affected by the centrifugal force.

[0048] In the rotor 2 of this embodiment, the connecting plate 26 is made of a non-magnetic material. This construction can reduce the power loss of the motor using the rotor 2. It can also reduce the manufacturing cost of the rotor 2. However, as another implementation, the connecting plate 26 can be made of a soft magnetic material, such as a magnet. That is, the connecting plate 26 can be made of the same material as the core block 22. In this construction, the connecting plate 26 can function like the core block 22, which can increase the output torque of the motor using the rotor 2.

[0049] Example 2

[0050] Reference Figure 6 and Figure 7The rotor 102 of Embodiment 2 is described. The rotor 102 of Embodiment 2 is also a component of an electric motor and constitutes the rotating body of the electric motor. Unless otherwise specifically mentioned in this embodiment, it is the same as the rotor 2 of Embodiment 1.

[0051] like Figure 6 As shown, the rotor 102 in this embodiment includes a shaft 110, a rotor core 120, and a pair of end plates 130b. Figure 6 In this embodiment, only one end plate 130b is shown, while the depiction of the other end plate is omitted. The shaft 110 of this embodiment has the same construction as the shaft 10 of Embodiment 1. That is, the shaft 110 has a shaft flow channel 112. The shaft flow channel 112 extends inside the shaft 110 along the rotation axis R of the rotor 102. The outer peripheral surface 110a of the shaft 110 is provided with a pair of keyways 114a, 114b and a joint (not shown; see [link]). Figure 1 (Joint 16 in the middle).

[0052] The rotor core 120 has a plurality of core blocks 122. The core blocks 122 are disposed on the outer peripheral surface 110a of the shaft 110 and arranged along the axial direction. The core blocks 122 include a first core block 122a, a second core block 122b, a third core block 122c, and a fourth core block 122d. The core blocks 122a to 122d are arranged in this order along the axial direction. That is, the first core block 122a is located furthest away on one side of the core block 122 in the axial direction. The second core block 122b is adjacent to the first core block 122a; the third core block 122c is adjacent to the second core block 122b; and the fourth core block 122d is adjacent to the third core block 122c. The number of core blocks 122 is not particularly limited.

[0053] Each core 122 in this embodiment has the same construction as core 22 in embodiment 1. That is, similar to... Figure 2A and Figure 2B The shown core block 22, each core block 122 has a plurality of magnet slots 40, and a bonding layer 42, a magnet 44, and a refrigerant flow channel 46 are disposed in each magnet slot 40. As described above, the refrigerant flow channel 46 is located inside the magnet slot 40. However, as another embodiment, each core block 122 may be provided with one or more holes that define the refrigerant flow channel 46 in the axial direction, separate from the magnet slots 40. The outer surface of each core block 122 is also provided with a plurality of peripheral grooves 123.

[0054] Similarly, in the rotor 102 of this embodiment, a plurality of core blocks 122 are arranged in a stepped, skewed manner. Therefore, the position of the magnet slot 40 (i.e., the position of the magnet 44 and the refrigerant flow channel 46) is offset circumferentially between two adjacent core blocks 122. The core blocks 122 are pressed axially by the end plate 130b.

[0055] like Figure 7 As shown, in the rotor 102 of this embodiment, a plurality of refrigerant supply flow channels 125 are formed in the end plate 130b. The construction and function of the refrigerant supply flow channels 125 are the same as those of the refrigerant supply flow channels 25 in Embodiment 1. That is, in the rotor 2 of Embodiment 1, the refrigerant flow channels 25 are disposed in the supply plate 24, while in the rotor 102 of Embodiment 2, the refrigerant supply flow channels 125 are disposed in the end plate 130b. The refrigerant supply flow channels 125 of the end plate 130b are configured to connect the shaft flow channel 112 disposed in the shaft 110 with the refrigerant flow channel 46 disposed in the first core block 122a. Therefore, the refrigerant flowing through the shaft flow channel 112 is supplied to each refrigerant flow channel 46 of the first core block 122a through the refrigerant supply flow channels 125 of the end plate 130b.

[0056] The construction of the refrigerant supply flow channel 125 is not particularly limited. As an example, a plurality of distribution flow channels 118 are formed in the shaft 110, and the distribution flow channels 118 form a plurality of refrigerant supply ports 118a in the outer peripheral surface 110a of the shaft 110. The refrigerant supply flow channels 125 of the end plate 130b are respectively connected to the refrigerant supply ports 118a of the shaft 110. The downstream end 125a of the refrigerant supply flow channel 125 is located at the position of the refrigerant flow channel 46 facing the first core block 122a and is connected to the refrigerant flow channel 46. As another embodiment, instead of providing the refrigerant supply flow channel 125 in the end plate 130b, the supply plate 24 described in Embodiment 1 can be disposed between the end plate 130b and the first core block 122a.

[0057] The rotor 102 in this embodiment also includes a plurality of connecting plates 126. Each connecting plate 126 has the same construction as the connecting plate 26 in embodiment 1. That is, similar to Figure 5The connecting plates 26 shown are each provided with multiple connecting flow channels 27. Each connecting plate 126 includes a first connecting plate 126a, a second connecting plate 126b, and a third connecting plate 126c. The first connecting plate 126a is disposed between the first core block 122a and the second core block 122b. Therefore, the refrigerant flow channels 46 of the first core block 122a and the second core block 122b are connected to each other through the connecting flow channels 27 of the first connecting plate 126a. The second connecting plate 126b is disposed between the second core block 122b and the third core block 122c, and the third connecting plate 126c is disposed between the third core block 122c and the fourth core block 122d. Therefore, when the connecting plates 126 are inserted therebetween, the refrigerant flow channels 46 of the core blocks 122 are sequentially connected to each other along the axial direction. Each of the keyways 114a, 114b engages with each of the protrusions 121a, 121b formed on the core block 122, the end plate 130b, and the connecting plate 126.

[0058] As described above, in the rotor 102 of the same embodiment, a connecting plate 126 is disposed between two core blocks 122 with stepped deflection. Each connecting plate 126 is provided with a connecting flow channel 27, through which the refrigerant flow channels 46 of the two core blocks 122 are connected. Therefore, in the rotor 102 with stepped deflection, sufficient refrigerant is allowed to flow through the refrigerant flow channel 46. The refrigerant flowing through the refrigerant flow channel 46 reaches another end plate (not shown), is discharged through a discharge port (not shown) provided in this end plate, and can be supplied to, for example, the coil end of the stator.

[0059] Although specific examples of the technologies disclosed in this specification have been described, these examples are provided for illustrative purposes only and are not intended to limit the scope of the claims. The technologies described in the claims include various modifications and variations of the specific examples described above. The technical elements described in this specification or drawings perform technical utility independently or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Furthermore, the technologies shown in this specification or drawings can achieve multiple purposes simultaneously and are technically useful by achieving one of these purposes.

Claims

1. A rotor for a motor, characterized in that... include: A shaft that extends in an axial direction; A rotor core having multiple core blocks disposed on the outer peripheral surface of the shaft and arranged along the axial direction. Each of the core blocks includes multiple magnets and a refrigerant flow channel extending along the axial direction. The core block includes a first core block and a second core block that is steppedly skewed relative to the first core block; as well as At least one plate is disposed on the outer peripheral surface of the shaft and arranged together with the core block along the axial direction. The at least one plate includes a refrigerant communication plate disposed between the first core block and the second core block, and The refrigerant connecting plate includes a connecting flow channel configured to connect the refrigerant flow channel of the first core block to the refrigerant flow channel of the second core block.

2. The rotor according to claim 1, characterized in that: Each of the core blocks is provided with a magnet slot, the magnet slot extending along the axial direction and accommodating at least one of the magnets; and The refrigerant flow channel is located inside the magnet slot and is defined between the outer surface of the magnet and the inner surface of the magnet slot.

3. The rotor according to claim 1, characterized in that, The refrigerant connecting plate has a connecting flow channel that extends in an arc shape along the circumferential direction with the rotation axis of the rotor as the center.

4. The rotor according to claim 1, characterized in that, The refrigerant connecting plate is made of a non-magnetic material.

5. The rotor according to claim 1, characterized in that, The refrigerant connecting plate is made of the same material as the core block.

6. The rotor according to any one of claims 1 to 5, characterized in that: The outer peripheral surface of the shaft is provided with a refrigerant supply port, through which refrigerant is discharged; The at least one plate further includes a refrigerant supply plate disposed adjacent to the first core block; and The refrigerant supply plate is provided with a refrigerant supply flow channel, which is configured to connect the refrigerant supply port of the shaft to the refrigerant flow channel of the first core block.

7. The rotor according to claim 6, characterized in that: The core block further includes a third core block disposed adjacent to the first core block, wherein the refrigerant supply plate is located between the third core block and the first core block; and The refrigerant supply flow channel of the refrigerant supply plate is also configured to connect the refrigerant supply port of the shaft to the refrigerant flow channel of the third core block.

8. The rotor according to claim 7, characterized in that: The core block also includes a fourth core block that is steppedly skewed relative to the third core block; The at least one plate further includes a second refrigerant communication plate disposed between the third core block and the fourth core block; and The second refrigerant connecting plate is provided with a connecting flow channel configured to connect the refrigerant flow channel of the third core block and the refrigerant flow channel of the fourth core block.

9. The rotor according to any one of claims 1 to 5, characterized in that: The first core block is located at the furthest point on one side of the core block in the axial direction; The at least one plate further includes an end plate, the end plate being adjacent to the first core block and located on one side of the first core block in the axial direction; and The end plate is provided with a refrigerant supply flow channel, through which refrigerant is supplied to the refrigerant flow channel of the first core block.

10. The rotor according to claim 9, characterized in that: The outer circumferential surface of the shaft is provided with a refrigerant supply port, through which refrigerant is discharged; and The refrigerant supply flow channel of the end plate is configured to connect the refrigerant supply port of the shaft to the refrigerant flow channel of the first core block.

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