Rotor

Abstract

This invention provides a technology for ensuring sufficient refrigerant flows through the refrigerant passage in a rotor equipped with stepped skew. [Solution] A rotor comprising a shaft, a rotor core having a plurality of core blocks provided on the outer circumferential surface of the shaft and arranged along the axial direction, and at least one plate provided on the outer circumferential surface of the shaft and arranged together with the plurality of core blocks along the axial direction. Each of the plurality of core blocks has a plurality of magnets arranged therein and a refrigerant flow path extending along the axial direction is formed therein, and the plurality of core blocks include a first core block and a second core block having a stepped skew relative to the first core block. At least one plate includes a refrigerant communication plate disposed between the first core block and the second core block. The refrigerant communication plate is provided with a communication flow path that connects the refrigerant flow path of the first core block and the refrigerant flow path of the second core block to each other.

Description

【Technical Field】 【0001】 The technology disclosed in this specification relates to a rotor. The rotor referred to here is one of the components of an electric motor (hereinafter, also simply referred to as a motor). 【Background Art】 【0002】 Patent Document 1 describes a rotor. This rotor includes a shaft extending along the axial direction, a rotor core provided on the outer peripheral surface of the shaft and having a plurality of core blocks arranged along the axial direction, and a refrigerant supply plate provided on the outer peripheral surface of the shaft and arranged together with the plurality of core blocks along the axial direction. In each of the plurality of core blocks, a plurality of magnets are arranged, and a refrigerant flow path extending along the axial direction is formed. A refrigerant supply port for discharging refrigerant is provided on the outer peripheral surface of the shaft, and a refrigerant supply flow path communicating the refrigerant supply port of the shaft with the refrigerant flow paths of the plurality of core blocks is provided on the refrigerant supply plate. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Unexamined Patent Application Publication No. 2015 - 177706 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 In the rotor of the electric motor described above, in order to achieve smooth operation at low rotational speeds, it is necessary to suppress the cogging torque generated by the magnetic force of the magnets arranged on the rotor. One known method for suppressing cogging torque is to create a stepped skew between adjacent core blocks. Here, creating a stepped skew means creating a difference in position (i.e., orientation) in the circumferential direction between adjacent core blocks. This disperses the magnetic force in the circumferential direction, thereby suppressing the generation of cogging torque. 【0005】 However, if a stepped skew is introduced between adjacent core blocks, the positions of the refrigerant flow paths in each core block will also be shifted relative to each other along the circumferential direction. As a result, there is a risk that the communication of refrigerant flow paths between those core blocks will be insufficient, or that the refrigerant flow paths will be completely interrupted. In such a state, it may not be possible to circulate enough refrigerant through the refrigerant flow paths, which could lead to insufficient cooling of the rotor core. 【0006】 In view of the above, this specification provides a technique for circulating a sufficient amount of refrigerant in a refrigerant flow path in a rotor provided with a stepped skew. [Means for solving the problem] 【0007】 The technology disclosed herein is embodied in a motor rotor. The rotor comprises a shaft extending axially, a rotor core provided on the outer circumferential surface of the shaft and having a plurality of core blocks arranged axially, and at least one plate provided on the outer circumferential surface of the shaft and arranged axially together with the plurality of core blocks. Each of the plurality of core blocks has a plurality of magnets arranged therein and a refrigerant flow path extending axially is formed therein. The plurality of core blocks include a first core block and a second core block having a stepped skew relative to the first core block. The at least one plate includes a refrigerant communication plate positioned between the first core block and the second core block. The refrigerant communication plate is provided with a communication flow path that connects the refrigerant flow path of the first core block and the refrigerant flow path of the second core block to each other. 【0008】 In the above configuration, a refrigerant communication plate is provided between the first core block and the second core block, which are provided with stepped skew. The refrigerant communication plate is provided with a communication channel, and the refrigerant channel of the first core block and the refrigerant channel of the second core block are in communication with each other via the communication channel. As a result, even in a rotor with stepped skew, the refrigerant can be smoothly circulated through its refrigerant channel. 【0009】 In one embodiment of this technology, each of the multiple core blocks may be provided with a magnet slot that extends along the axial direction and accommodates at least one of the multiple magnets. The refrigerant flow path may be located within the magnet slot and defined between the outer surface of the magnet and the inner surface of the magnet slot. 【0010】 In the above configuration, a coolant can be circulated inside the magnet slots where the magnets are housed. This allows the magnets in each core block to be directly cooled by the coolant. 【0011】 In one embodiment of this technology, the communication channel of the refrigerant communication plate may extend in an arc shape along the circumferential direction centered on the rotor's axis of rotation. With this configuration, the centrifugal force caused by the rotor's rotation acts perpendicularly to the flow of refrigerant in the communication channel, allowing the refrigerant to flow smoothly through the communication channel without being affected by the centrifugal force. 【0012】 In one embodiment of this technology, the refrigerant communication plate may be made of a non-magnetic material. This configuration can reduce the power loss of the motor. It can also reduce the manufacturing cost of the rotor. 【0013】 In one embodiment of this technology, the refrigerant communication plate may be made of the same material as the core block. This configuration can improve the output torque of the motor. 【0014】 In one embodiment of this technology, the outer circumferential surface of the shaft may be provided with a refrigerant supply port for discharging refrigerant, and at least one plate may further include a refrigerant supply plate positioned adjacent to the first core block. The refrigerant supply plate may be provided with a refrigerant supply channel that connects the refrigerant supply port of the shaft with the refrigerant flow path of the first core block. 【0015】 In the above configuration, the refrigerant discharged from the refrigerant supply port of the shaft is supplied to the refrigerant flow path of the first core block via the refrigerant supply path of the refrigerant supply plate. The refrigerant supplied to the refrigerant flow path of the first core block is then supplied to the refrigerant flow path of the second core block via the communication path of the refrigerant communication plate. In this way, the refrigerant supplied from the shaft can be smoothly circulated to the first and second core blocks, which are provided with stepped skew. 【0016】 In the above embodiment, the plurality of core blocks may further include a third core block positioned adjacent to the first core block with a refrigerant supply plate in between. The refrigerant supply flow path of the refrigerant supply plate may further connect the refrigerant supply port of the shaft with the refrigerant flow path of the third core block. With this configuration, the refrigerant supplied from the shaft can be circulated not only through the refrigerant flow path of the first core block located on one side of the refrigerant supply plate, but also through the refrigerant flow paths of the third core block located on the other side of the refrigerant supply plate. 【0017】 In the above embodiment, the plurality of core blocks may further include a fourth core block that is skewed relative to the third core block. At least one plate may further include a second refrigerant communication plate positioned between the third core block and the fourth core block. The second refrigerant communication plate may be provided with a communication channel that connects the refrigerant flow path of the third core block and the refrigerant flow path of the fourth core block to each other. With this configuration, the refrigerant supplied from the refrigerant supply port of the shaft to the refrigerant flow path of the third core block can be circulated to the refrigerant flow path of the fourth core block via the communication channel of the second refrigerant communication plate. This allows the refrigerant supplied from the shaft to be smoothly supplied to the fourth core block, which is skewed relative to the third core block. 【0018】 In one embodiment of this technology, the first core block may be located on the axially closest side among a plurality of core blocks. At least one plate may further include an end plate adjacent to the first core block from one axial side. The end plate may be provided with a refrigerant supply channel for supplying refrigerant to the refrigerant flow path of the first core block. In this way, refrigerant may be supplied to the refrigerant flow path of the first core block from the end plate. In this case, although not particularly limited, the refrigerant may flow in one direction from one end of the rotor to the other end. 【0019】 In the above embodiment, a refrigerant supply port for discharging refrigerant may be provided on the outer peripheral surface of the shaft, and the refrigerant supply passage of the end plate may communicate the refrigerant supply port of the shaft with the refrigerant passage of the first core block. According to this configuration, refrigerant can be supplied from the refrigerant supply port of the shaft to the refrigerant passage of the first core block through the refrigerant supply passage of the end plate. 【Brief Description of the Drawings】 【0020】 [Figure 1] It is a diagram schematically showing the configuration of the rotor 2 of Example 1. [Figure 2] FIG. 2(A) shows a cross-sectional view of the first core block 22a taken along line II(A)-II(A) of FIG. 1. FIG. 2(B) shows a cross-sectional view of the second core block 22b taken along line II(B)-II(B) of FIG. 1. [Figure 3] It is an enlarged cross-sectional view showing the state of a part III of the cross-sectional view of the first core block 22a in FIG. 2(A). [Figure 4] It shows a cross-sectional view of the supply plate 24 of Example 1 as seen from the direction of the rotation axis R. [Figure 5] It shows a cross-sectional view of the first communication plate 26a of Example 1 as seen from the direction of the rotation axis R. [Figure 6] It is a diagram schematically showing the configuration of the rotor 102 of Example 2. [Figure 7] It shows a cross-sectional view of the end plate 130b of Example 2 as seen from the direction of the rotation axis R. 【Embodiments for Carrying Out the Invention】 【0021】 (Example 1) Referring to the drawings, the rotor 2 of Example 1 will be described. Although it is an example, the rotor 2 of Example 1 is one of the components of an electric motor and constitutes a rotating body in the electric motor. For example, the electric motor may be a three-phase AC motor. Note that the configuration described in Example 1 is not limited to a three-phase AC motor and can be similarly adopted for other types of electric motors. ] 【0022】 As shown in Figures 1 and 2, the rotor 2 of Embodiment 1 comprises a shaft 10, a rotor core 20, and a pair of end plates 30a and 30b. Hereinafter, 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 figures), the direction perpendicular to the rotation axis R is defined as the radial direction (direction D2 in the figures), and the direction perpendicular to the axial and radial directions is defined as the circumferential direction (direction D3 in the figures). 【0023】 The shaft 10 extends along the rotation axis R of the rotor 2. The shaft 10 has a shaft passage 12 through which refrigerant flows. The shaft passage 12 extends inside the shaft 10 along the rotation axis R of the rotor 2. Refrigerant is supplied to the shaft passage 12 from the outside. A pair of keyways 14a and 14b are provided on the outer circumferential surface 10a of the shaft 10. Although not particularly limited, the pair of keyways 14a and 14b are formed at opposing positions in the circumferential direction. The pair of keyways 14a and 14b engage with a pair of protrusions 21a and 21b formed on each of the core blocks 22. A locking portion 16 is also provided on the outer circumferential surface 10a of the shaft 10. The locking portion 16 bulges radially from the outer circumferential surface 10a of the shaft 10 and positions a pair of end plates 30a and a plurality of core blocks 22 in the axial direction. The specific configuration of the shaft 10 is not particularly limited. 【0024】 The rotor core 20 has a plurality of core blocks 22. The plurality of core blocks 22 are provided on the outer circumferential surface 10a of the shaft 10 and are arranged along the axial direction. The plurality of core blocks 22 include three core blocks 22a, 22b, and 22c located on one side in the axial direction (right side in Figure 1), and three core blocks 22d, 22e, and 22f located on the other side in the axial direction (left side in Figure 1). Hereinafter, of the three core blocks 22a, 22b, and 22c located on one side in the axial direction, the core block 22a located in the central part in the axial direction will be referred to as the first core block 22a, and the core block 22b adjacent to it will be referred to as the second core block 22b. Also, of the three core blocks 22d, 22e, and 22f located on the other side in the axial direction, the core block 22d located in the central part in the axial direction will be referred to as the third core block 22d, and the core block 22e adjacent to it will be referred to as the fourth core block 22e. The number of core blocks 22 is not particularly limited. 【0025】 Each core block 22 has a cylindrical shape and is positioned coaxially with the rotation axis R of the rotor 2. Each core block 22 is made of a soft magnetic material, such as electrical steel. The specific configuration of each core block 22 is not particularly limited. For example, in Embodiment 1, each core block 22 has a structure in which electrical steel sheets are laminated. 【0026】 Each core block 22 is provided with multiple magnet slots 40. As an example, as shown in Figure 2(A), in the first core block 22a, the multiple magnet slots 40 are arranged circumferentially along the outer surface 23a of the first core block 22a. As shown in Figure 3, a magnet 44 is housed inside each magnet slot 40. Each magnet 44 extends along the axial direction. Each magnet 44 is fixed to the magnet slot 40 by an adhesive layer 42. The adhesive layer 42 is made of an insulating adhesive. 【0027】 A refrigerant flow path 46 is defined within each magnet slot 40 between the outer surface of the magnet 44 and the inner surface of the magnet slot 40. The refrigerant flow path 46 also extends along the axial direction. With this configuration, the magnets 44 housed inside the magnet slots 40 can be directly cooled by the refrigerant by circulating the refrigerant through the refrigerant flow path 46. In other embodiments, the refrigerant flow path 46 may be provided independently of the magnet slots 40. That is, each core block 22 may have one or more holes defining the refrigerant flow path 46, provided along the axial direction, separate from the plurality of magnet slots 40. 【0028】 As shown in Figure 2(B), in the second core block 22b, a plurality of magnet slots 40 are arranged circumferentially along the outer surface 23b of the second core block 22b. A magnet 44 is housed inside each magnet slot 40, and a refrigerant flow path 46 is defined within it. In other words, the second core block 22b has the same configuration as the first core block 22a. However, as will be described in detail later, a stepped skew is provided between the first core block 22a and the second core block 22b. Therefore, the positions of the protrusions 21a and 21b that engage with the keyways 14a and 14b are shifted relative to each other by the angle difference of the stepped skew between the first core block 22a and the second core block 22b. Although not shown, the other core blocks 22c, 22d, 22e, and 22f also have the same configuration as the first core block 22a, except for the positions of the protrusions 21a and 21b. 【0029】 Each core block 22 has a plurality of outer peripheral grooves 23 provided on its outer surface. The plurality of outer peripheral grooves 23 are formed for the purpose of reducing the torque ripple of the electric motor configured using the rotor 2. Although not particularly limited, in this embodiment, each core block 22 of the rotor 2 is provided with four outer peripheral grooves 23. Each outer peripheral groove 23 extends along the axial direction. 【0030】 Multiple core blocks 22 are provided with stepped skew (also called offset skew). Stepped skew means that two adjacent core blocks 22 are offset from each other in the circumferential direction. For example, as shown in Figures 2(A) and (B), a stepped skew 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 from the first core block 22a by an angle θ in the circumferential direction. Therefore, the positions of the magnet slots 40 (i.e., the positions of the magnets 44 and the refrigerant flow path 46) are offset from each other by an angle θ between the first core block 22a and the second core block 22b. In addition, the positions of the outer circumferential grooves 23 are also offset from each other by an angle θ between the first core block 22a and the second core block 22b. For example, as shown in Figure 2(A), the first core block 22a has an outer circumferential groove 23 at position C1, whereas, as shown in Figure 2(B), the second core block 22b has an outer circumferential groove 23 at position C2, which is offset by an angle θ from position C1 in the circumferential direction. 【0031】 Similarly, a stepped skew is provided between the second core block 22b and the adjacent core block 22c. A stepped skew is also provided between the third core block 22d and the adjacent fourth core block 22e. Furthermore, a stepped skew is provided between the fourth core block 22e and the adjacent core block 22f. On the other hand, no stepped skew is provided between the first core block 22a and the third core block 22d. In other words, in the rotor 2 of this embodiment, the three core blocks 22a, 22b, and 22c arranged on one side in the axial direction (right side in Figure 1) and the three core blocks 22d, 22e, and 22f arranged on the other side in the axial direction (left side in Figure 1) have a symmetrical structure. 【0032】 Multiple core blocks 22 are pressed axially by a pair of end plates 30a and 30b. The pair of end plates 30a and 30b are positioned at both ends of the multiple core blocks 22 in the axial direction. One end plate 30a is positioned adjacent to a locking portion 16, and its axial position is fixed by the locking portion 16. The other end plate 30b is positioned adjacent to a nut 32. The nut 32 is tightened onto the shaft 10 and presses the multiple core blocks 22 axially through the other end plate 30b. 【0033】 As shown in Figure 1, the rotor 2 of this embodiment further comprises a plurality of plates 24, 26. The plurality of plates 24, 26 are provided on the outer circumferential surface 10a of the shaft 10 and are arranged along the axial direction together with a plurality of core blocks 22. The plurality of plates 24, 26 include a supply plate 24 and a plurality of communication plates 26. The plurality of communication plates 26 also include a first communication plate 26a, a second communication plate 26b, a third communication plate 26c, and a fourth communication plate 26d. Although not particularly limited, the supply plate 24 and the plurality of communication plates 26 are made of non-magnetic aluminum. However, the supply plate 24 and the plurality of communication plates 26 may be made of a soft magnetic material, such as electrical steel. Alternatively, the supply plate 24 and the plurality of communication plates 26 may be made of a non-metallic material, such as resin. 【0034】 The supply plate 24 is positioned between the first core block 22a and the third core block 22d. As shown in Figure 4, the supply plate 24 has a plurality of refrigerant supply channels 25 formed therein. The plurality of refrigerant supply channels 25 are arranged at equal intervals along the circumferential direction. The plurality of refrigerant supply channels 25 communicate with each other the shaft channel 12 provided in the shaft 10 and the refrigerant channel 46 provided in the first core block 22a. As a result, the refrigerant flowing through the shaft channel 12 is supplied to each of the refrigerant channels 46 in the first core block 22a via the plurality of refrigerant supply channels 25 of the supply plate 24. In addition, the plurality of refrigerant supply channels 25 communicate with each other the shaft channel 12 provided in the shaft 10 and the refrigerant channel 46 provided in the third core block 22d. As a result, the refrigerant flowing through the shaft channel 12 is also supplied to each of the refrigerant channels 46 in the third core block 22d via the plurality of refrigerant supply channels 25 of the supply plate 24. 【0035】 The specific configuration of the supply plate 24 is not particularly limited. For example, in the rotor 2 of this embodiment, a plurality of distribution channels 18 are formed on the shaft 10, extending radially from the shaft channel 12. Each of the plurality of distribution channels 18 extends to the outer circumferential surface 10a of the shaft 10, and a plurality of refrigerant supply ports 18a are formed on the outer circumferential surface 10a of the shaft 10. The plurality of refrigerant supply channels 25 of the supply plate 24 are connected to the plurality of refrigerant supply ports 18a of the shaft 10. The downstream end 25a of the refrigerant supply channel 25 is located opposite the refrigerant channel 46 of the first core block 22a and the refrigerant channel 46 of the third core block 22d, and is connected to those refrigerant channels 46. The supply plate 24 is also provided with protrusions 21a and 21b that engage with the keyways 14a and 14b of the shaft 10. 【0036】 As mentioned above, the multiple communication plates 26 include a first communication plate 26a, a second communication plate 26b, a third communication plate 26c, and a fourth communication plate 26d. The first communication plate 26a is positioned between the first core block 22a and the second core block 22b. As shown in Figure 5, the first communication plate 26a is provided with multiple communication channels 27. Each of the multiple communication channels 27 extends in an arc shape along the circumferential direction and connects the refrigerant channel 46 of the first core block 22a and the refrigerant channel 46 of the second core block 22b to each other. Here, each communication channel 27 extends within an angle θ range in the circumferential direction. This angle θ corresponds to the angle θ of the stepped skew provided between the first core block 22a and the second core block 22b. In other words, each communication channel 27 extends from a position facing the refrigerant channel 46 of the first core block 22a to a position facing the refrigerant channel 46 of the second core block 22b. 【0037】 The other communication plates 26b, 26c, and 26d have similar configurations and functions. The second communication plate 26b is positioned between the second core block 22b and another core block 22c that communicates with it. The second communication plate 26b is provided with a communication channel 27 that connects the refrigerant flow path 46 of the second core block 22b and the refrigerant flow path 46 of the other core block 22c to each other. The third communication plate 26c is positioned between the third core block 22d and the fourth core block 22e. The third communication plate 26c is provided with a communication channel 27 that connects the refrigerant flow path 46 of the third core block 22d and the refrigerant flow path 46 of the fourth core block 22e to each other. The fourth communication plate 26d is positioned between the fourth core block 22e and another core block 22f adjacent to it. The fourth communication plate 26d is provided with a communication channel 27 that connects the refrigerant flow channel 46 of the fourth core block 22e to the refrigerant flow channel 46 of the other core block 22f. 【0038】 As described above, in the rotor 2 of this embodiment, a communication plate 26 is provided between two core blocks 22 that are provided with stepped skew. Each communication plate 26 is provided with a plurality of communication passages 27, and the plurality of refrigerant passages 46 of the two core blocks 22 are in communication with each other via the plurality of communication passages 27. As a result, even in the rotor 2 provided with stepped skew, a sufficient amount of refrigerant can be smoothly circulated through its refrigerant passages 46. The refrigerant flowing through the refrigerant passages 46 reaches a pair of end plates 30a and 30b, respectively, and is discharged from outlets (not shown) provided on the pair of end plates 30a and 30b, and can be supplied, for example, to the coil ends of the stator. 【0039】 In the rotor 2 of this embodiment, the communication passage 27 of the communication plate 26 extends in an arc shape along the circumferential direction. With this configuration, the centrifugal force caused by the rotation of the rotor 2 acts perpendicularly to the flow of refrigerant in the communication passage 27, so that the refrigerant can flow smoothly through the communication passage 27 without being affected by the centrifugal force. 【0040】 In this embodiment, the rotor 2 is made of a non-magnetic material. This configuration reduces the power loss of the motor employing the rotor 2. It also reduces the manufacturing cost of the rotor 2. However, in other embodiments, the communication plate 26 may be made of a soft magnetic material, such as electromagnetic steel. That is, the communication plate 26 may be made of the same material as the core block 22. With this configuration, the communication plate 26 can function similarly to the core block 22, and the output torque of the motor employing the rotor 2 can be improved. 【0041】 (Example 2) Referring to Figures 6 and 7, the rotor 102 of Embodiment 2 will be described. The rotor 102 of Embodiment 2 is also one of the components of an electric motor and constitutes a rotating body in the electric motor. Points not specifically mentioned in this embodiment are assumed to be common with the rotor 2 of Embodiment 1, insofar as they do not contradict the following description. 【0042】 As shown in Figure 6, the rotor 102 of this embodiment comprises a shaft 110, a rotor core 120, and a pair of end plates 130b. Note that in Figure 6, only one end plate 130b is shown, and the other end plate is omitted from the illustration. The shaft 110 of this embodiment has the same configuration as the shaft 10 of Embodiment 1. That is, the shaft 110 has a shaft flow path 112. The shaft flow path 112 extends through the inside of the shaft 110 along the rotation axis R of the rotor 102. In addition, a pair of keyways 114a, 114b and a locking portion (not shown; see locking portion 16 in Figure 1) are provided on the outer circumferential surface 110a of the shaft 110. 【0043】 The rotor core 120 has a plurality of core blocks 122. The plurality of core blocks 122 are provided on the outer circumferential surface 110a of the shaft 110 and are arranged along the axial direction. The plurality of 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. These core blocks 122a-122d are arranged sequentially along the axial direction. That is, the first core block 122a is located on the outermost side in the axial direction among the plurality of core blocks 122. 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 the plurality of core blocks 122 is not particularly limited. 【0044】 Each core block 122 in this embodiment has the same configuration as the core block 22 in Embodiment 1. That is, each core block 122, like the core block 22 shown in Figure 2, has a plurality of magnet slots 40, and each magnet slot 40 is provided with an adhesive layer 42, a magnet 44, and a refrigerant flow path 46. As mentioned above, the refrigerant flow path 46 is located within the magnet slot 40. However, in other embodiments, each core block 122 may have one or more holes defining the refrigerant flow path 46 along the axial direction, in addition to the plurality of magnet slots 40. Furthermore, each core block 122 is also provided with a plurality of outer peripheral grooves 123 on its outer surface. 【0045】 In the rotor 102 of this embodiment, the multiple core blocks 122 are also provided with stepped skew. Therefore, the positions of the magnet slots 40 (i.e., the positions of the magnets 44 and the refrigerant flow paths 46) between two adjacent core blocks 122 are offset from each other in the circumferential direction. The multiple core blocks 122 are pressed axially by a pair of end plates 130b. 【0046】 As shown in Figure 7, in the rotor 102 of this embodiment, a plurality of refrigerant supply passages 125 are formed in the end plate 130b. The configuration and function of the plurality of refrigerant supply passages 125 are the same as those of the plurality of refrigerant supply passages 25 in Embodiment 1. That is, in the rotor 2 of Embodiment 1, a plurality of refrigerant supply passages 25 were provided in the supply plate 24, whereas in the rotor 102 of Embodiment 2, a plurality of refrigerant supply passages 125 are provided in the end plate 130b. The refrigerant supply passages 125 of the end plate 130b communicate with the shaft passage 112 provided in the shaft 110 and the refrigerant passage 46 provided in the first core block 122a. As a result, the refrigerant flowing through the shaft passage 112 is supplied to each of the refrigerant passages 46 of the first core block 122a via the plurality of refrigerant supply passages 125 of the end plate 130b. 【0047】 The configuration of the multiple refrigerant supply channels 125 is not particularly limited. For example, the shaft 110 has multiple distribution channels 118 formed therein, and these distribution channels 118 have multiple refrigerant supply ports 118a formed on the outer circumferential surface 110a of the shaft 110. The multiple refrigerant supply channels 125 of the end plate 130b are connected to the multiple refrigerant supply ports 118a of the shaft 110. The downstream end 125a of the refrigerant supply channel 125 is located opposite the refrigerant channel 46 of the first core block 122a and is connected to the refrigerant channel 46. In another embodiment, instead of providing multiple refrigerant supply channels 125 on the end plate 130b, the supply plate 24 described in Example 1 may be placed between the end plate 130b and the first core block 122a. 【0048】 The rotor 102 of this embodiment further comprises a plurality of communication plates 126. Each communication plate 126 has the same configuration as the communication plate 26 in Embodiment 1. That is, each communication plate 126, like the communication plate 26 shown in Figure 5, is provided with a plurality of communication passages 27. The plurality of communication plates 126 include a first communication plate 126a, a second communication plate 126b, and a third communication plate 126c. The first communication plate 126a is positioned between the first core block 122a and the second core block 122b. As a result, the refrigerant passage 46 of the first core block 122a and the refrigerant passage 46 of the second core block 122b are connected to each other via the plurality of communication passages 27 of the first communication plate 126a. The second connecting plate 126b is positioned between the second core block 122b and the third core block 122c, and the third connecting plate 126c is positioned between the third core block 122c and the fourth core block 122d. As a result, the refrigerant flow paths 46 of the multiple core blocks 122 are connected in a continuous line along the axial direction by interposing the multiple connecting plates 126. In addition, the pair of keyways 114a and 114b engage with the multiple core blocks 122, the pair of end plates 130b, and the pair of protrusions 121a and 121b formed on the multiple connecting plates 126, respectively. 【0049】 As described above, in the rotor 102 of this embodiment, a communication plate 126 is provided between the two core blocks 122 that are provided with stepped skew. Each communication plate 126 is provided with a plurality of communication passages 27, and the plurality of refrigerant passages 46 of the two core blocks 122 are in communication with each other via the plurality of communication passages 27. As a result, even in the rotor 102 that is provided with stepped skew, a sufficient amount of refrigerant can be smoothly circulated through its refrigerant passages 46. The refrigerant flowing through the refrigerant passages 46 reaches the other end plate (not shown), is discharged from an outlet (not shown) provided on the end plate, and can be supplied, for example, to the coil end of the stator. 【0050】 The specific examples of the technology disclosed in this specification have been described in detail above, but these are merely illustrative and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes to the specific examples described above. The technical elements described in this specification or drawings exhibit technical usefulness individually or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Furthermore, the technology illustrated in this specification or drawings can achieve multiple objectives simultaneously, and achieving even one of these objectives itself constitutes technical usefulness. [Explanation of symbols] 【0051】 2: Rotor 10: Shaft 10a: Outer surface 12: Shaft flow path 14a, 14b: Keyway 16: Locking part 18: Distribution channel 18a: Refrigerant supply port 20: Rotor core 21a, 21b: Protrusion 22: Core Block 22a: First core block 22b: Second core block 22d: Third core block 22e: Fourth core block 22f: Core Block 23: Outer perimeter groove 23a, 23b: Outer surface 24: Supply Plate 25: Refrigerant supply path 25a: Downstream end 26: Connecting plate 26a: First connecting plate 26b: Second connecting plate 26c: Third connecting plate 26d: Fourth connecting plate 27: Connecting channel 30a, 30b: End plate 32: Nut 40: Magnetic slot 42: Adhesive layer 44: Magnet 46: Refrigerant flow path 102: Rotor 110: Shaft 110a: Outer surface 112: Shaft flow path 114a, 114b: Keyway 118: Distribution channel 118a: Refrigerant supply port 120: Rotor core 121a, 121b: Protrusion 122: Core Block 122a: First core block 122b: Second core block 122c: Third core block 122d: Fourth core block 123: Outer perimeter groove 125: Refrigerant supply path 125a: Downstream end 126: Connecting plate 126a: First connecting plate 126b: Second connecting plate 126c: Third connecting plate 130b: End plate R: Axis of rotation θ: angle

Claims

[Claim 1] It is the rotor of a motor, A shaft extending along the axial direction, A rotor core having a plurality of core blocks provided on the outer circumferential surface of the shaft and arranged along the axial direction, At least one plate provided on the outer circumferential surface of the shaft and arranged together with the plurality of core blocks along the axial direction, Equipped with, Each of the aforementioned multiple core blocks is provided with multiple magnets, and a refrigerant flow path extending along the axial direction is formed therein. The plurality of core blocks include the first core block and the second core block which is provided with a stepped skew relative to the first core block. The at least one plate includes a refrigerant communication plate disposed between the first core block and the second core block, The refrigerant communication plate is provided with a communication channel that connects the refrigerant flow path of the first core block and the refrigerant flow path of the second core block to each other. Rotor. [Claim 2] Each of the plurality of core blocks is provided with a magnet slot that extends along the axial direction and accommodates at least one of the plurality of magnets, The rotor according to claim 1, wherein the refrigerant flow path is located within the magnet slot and is defined between the outer surface of the magnet and the inner surface of the magnet slot. [Claim 3] The rotor according to claim 1, wherein the communication channel of the refrigerant communication plate extends in an arc shape along the circumferential direction with respect to the rotation axis of the rotor. [Claim 4] The rotor according to claim 1, wherein the refrigerant communication plate is made of a non-magnetic material. [Claim 5] The rotor according to claim 1, wherein the refrigerant communication plate is made of the same material as the core block. [Claim 6] The outer circumferential surface of the shaft is provided with a refrigerant supply port for discharging the refrigerant. The at least one plate further includes a refrigerant supply plate disposed adjacent to the first core block, The refrigerant supply plate is provided with a refrigerant supply channel that connects the refrigerant supply port of the shaft with the refrigerant flow path of the first core block. The rotor according to any one of claims 1 to 5. [Claim 7] The plurality of core blocks further include a third core block arranged adjacent to the first core block with the refrigerant supply plate in between, The rotor according to claim 6, wherein the refrigerant supply channel of the refrigerant supply plate further connects the refrigerant supply port of the shaft with the refrigerant channel of the third core block. [Claim 8] The plurality of core blocks further include a fourth core block having a stepped skew relative to the third core block, The at least one plate further includes a second refrigerant communication plate positioned between the third core block and the fourth core block, The rotor according to claim 7, wherein the second refrigerant communication plate is provided with a communication channel that connects the refrigerant flow path of the third core block and the refrigerant flow path of the fourth core block to each other. [Claim 9] The first core block is located on the furthest side in the axial direction among the plurality of core blocks. The at least one plate further includes an end plate adjacent to the first core block from one side in the axial direction, The rotor according to any one of claims 1 to 5, wherein the end plate is provided with a refrigerant supply channel for supplying refrigerant to the refrigerant channel of the first core block. [Claim 10] The outer circumferential surface of the shaft is provided with a refrigerant supply port for discharging the refrigerant. The rotor according to claim 9, wherein the refrigerant supply passage of the end plate connects the refrigerant supply port of the shaft with the refrigerant passage of the first core block.

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