Rotor

Abstract

To provide a rotor having a plurality of rotating rotor cores that reduce contact between connecting pins and rotor cores.SOLUTION: A rotor includes a shaft, a plurality of fixed rotor cores fixed to the shaft, a plurality of rotating rotor cores attached to the shaft, connecting pins connecting the plurality of rotating rotor cores, and a rotary mechanism connected to the plurality of rotating rotor cores via the connecting pins to rotate the plurality of rotating rotor cores relative to the shaft. The plurality of fixed rotor cores and the plurality of rotating rotor cores are arranged alternately in the axial direction of the shaft. Each of the plurality of fixed rotor cores has a slit hole that axially penetrates the fixed rotor core and extends circumferentially along the shaft. The connecting pin extends between the plurality of rotating rotor cores through each slit hole of the plurality of fixed rotor cores. Each of the plurality of fixed rotor cores has an inlet path for introducing lubricating liquid into the slit hole.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The technology disclosed in this specification relates to a rotor. [Background technology]

[0002] Patent Document 1 describes a rotor including a fixed rotor core and a rotating rotor core. The fixed rotor core is fixed to a shaft, and the rotating rotor core is rotatable relative to the shaft. The rotor also has a rotation mechanism that rotates the rotating rotor core. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2010-154699 Summary of the Invention [Problem to be solved by the invention]

[0004] When multiple rotating rotor cores are provided on a shaft, it is possible to use connecting pins to rotate the multiple rotating rotor cores as a unit relative to the shaft. In this case, the connecting pins connect the multiple rotating rotor cores through slits formed in the fixed rotor core. However, when the connecting pins move through the slits, they come into contact with the inner edges that define the slits in the rotor core, which can cause relatively loud contact noise and wear between the connecting pins and the fixed rotor core. This specification provides a technology that can mitigate contact between the connecting pins and the rotor core in a rotor having multiple rotating rotor cores. [Means for solving the problem]

[0005] The rotor disclosed in this specification includes a shaft, a plurality of fixed rotor cores fixed to the shaft, a plurality of rotating rotor cores attached to the shaft and rotatable relative to the shaft around the shaft, connecting pins connecting the plurality of rotating rotor cores, and a rotation mechanism connected to the plurality of rotating rotor cores connected via the connecting pins and rotating the plurality of rotating rotor cores relative to the shaft. The plurality of fixed rotor cores and the plurality of rotating rotor cores are arranged alternately in the axial direction of the shaft. Each of the plurality of fixed rotor cores has a slit hole that penetrates the fixed rotor core in the axial direction and extends along the circumferential direction of the shaft. The connecting pin extends between the plurality of rotating rotor cores through the slit hole of each of the plurality of fixed rotor cores. Each of the plurality of fixed rotor cores further has an inlet path for introducing lubricating liquid into the slit hole.

[0006] In the above-described configuration, the multiple rotating rotor cores are connected by connecting pins extending through slit holes in each fixed rotor core. Therefore, when the connecting pins move through the slit holes, the multiple rotating rotor cores rotate together relative to the shaft. Each fixed rotor core is provided with an introduction path for introducing lubricating liquid into the slit holes. With this configuration, the lubricating liquid introduced from the introduction path into the slit holes can function as a buffer when the connecting pins move through the slit holes. This reduces contact between the connecting pins and the inner edges of each fixed rotor core. This reduces contact noise caused by contact between the connecting pins and each fixed rotor core, and also suppresses wear between the connecting pins and each fixed rotor core. [Brief explanation of the drawings]

[0007] [Figure 1] 1 shows a cross-sectional view along the rotation axis of an electric motor. [Figure 2] 1 shows a plan view of a fixed rotor core viewed along the axial direction. [Figure 3]1 shows a plan view of a rotating rotor core viewed along the axial direction. DETAILED DESCRIPTION OF THE INVENTION

[0008] The electric motor shown in Fig. 1 is mounted on an electric vehicle. The electric motor drives the wheels of the electric vehicle. The electric motor includes a rotor 20 and a stator 60. The stator 60 has a cylindrical shape. The rotor 20 is disposed radially inside the stator 60. The rotor 20 is disposed rotatably about a rotation axis AX.

[0009] The rotor 20 has a shaft 22. The shaft 22 is arranged so that its central axis coincides with the rotation axis AX. A rotor core is attached concentrically to the shaft 22. The rotor core is composed of a plurality of fixed rotor cores 44 and a plurality of rotating rotor cores 46. Each of the fixed rotor cores 44 and the rotating rotor cores 46 is made of a material with high magnetic permeability. Each of the fixed rotor cores 44 and the rotating rotor cores 46 has a disk shape with a through hole in the center. The shaft 22 is inserted through the center holes of the fixed rotor cores 44 and the rotating rotor cores 46. Each fixed rotor core 44 is fixed to the shaft 22. Each rotating rotor core 46 is rotatable relative to the shaft 22 around the rotation axis AX. The fixed rotor cores 44 and the rotating rotor cores 46 are arranged alternately in a direction parallel to the rotation axis AX of the shaft 22 (hereinafter referred to as the axial direction).

[0010] As shown in Fig. 2, a plurality of magnetic poles 48a are arranged inside each fixed rotor core 44. Each magnetic pole 48a is, for example, a permanent magnet. In each fixed rotor core 44, the plurality of magnetic poles 48a are arranged rotationally symmetrically with respect to the rotation axis AX. As shown in Fig. 3, a plurality of magnetic poles 48b are arranged inside each rotating rotor core 46. Each magnetic pole 48b is, for example, a permanent magnet. In each rotating rotor core 46, the plurality of magnetic poles 48b are arranged rotationally symmetrically with respect to the rotation axis AX.

[0011] As shown in FIG. 1, each fixed rotor core 44 has a slit hole 44a penetrating the fixed rotor core 44 in the axial direction. When viewed in the axial direction as shown in FIG. 2, the slit hole 44a extends in the circumferential direction of the shaft 22 (hereinafter simply referred to as the circumferential direction). As shown in FIG. 1, each rotating rotor core 46 has a through hole 46a penetrating the rotating rotor core 46 in the axial direction. The rotor 20 has a connecting pin 50. The connecting pin 50 extends in the axial direction and is inserted into the slit hole 44a of each fixed rotor core 44 and the through hole 46a of each rotating rotor core 46. The outer circumferential surface of the connecting pin 50 contacts the inner circumferential surface of each through hole 46a. Note that the connecting pin 50 may be fixed to the rotating rotor core 46 within each through hole 46a, or the connecting pin 50 may be slidable relative to the rotating rotor core 46 within each through hole 46a. The connecting pins 50 connect the multiple rotating rotor cores 46 to each other. As described above, the connecting pin 50 is inserted into the slit hole 44a that extends in the circumferential direction. Therefore, the connecting pin 50 can move in the circumferential direction. When the connecting pin 50 moves in the circumferential direction, the connecting pin 50 and the multiple rotating rotor cores 46 rotate together relative to the shaft 22.

[0012] As shown in FIG. 1 , a rotation mechanism 52 is provided at the end of the rotor core. The rotation mechanism 52 is connected to a connecting pin 50 and is connected to each of the rotating rotor cores 46 via the connecting pin 50. The rotation mechanism 52 rotates each of the rotating rotor cores 46 relative to the shaft 22 by moving the connecting pin 50 in the circumferential direction. The rotation mechanism 52 rotates each of the rotating rotor cores 46 in response to the centrifugal force or torque applied to the rotor 20. The rotation mechanism 52 may be actuated by the elastic force of a spring or the like, or may be electrically controlled. The specific configuration of the rotation mechanism 52 is not particularly limited, as long as it rotates the multiple rotating rotor cores 46 connected via the connecting pin 50 relative to the shaft 22. Furthermore, the rotation mechanism 52 does not necessarily have to be directly connected to the connecting pin 50, and may be directly connected to at least one of the multiple rotating rotor cores 46. FIG. 2 shows three positions of the connecting pin 50: a first position 50a, a second position 50b, and a third position 50c. The rotation mechanism 52 can move the connecting pin 50 among a first position 50a, a second position 50b, and a third position 50c. The first position 50a is the frontmost position within the slit 44a (i.e., the front side in the rotation direction of the rotor 20), the second position 50b is an intermediate position within the slit 44a, and the third position 50c is the rearmost position within the slit 44a. When the rotation mechanism 52 moves the connecting pin 50 in the circumferential direction, each rotating rotor core 46 rotates, changing the relative angle of each rotating rotor core 46 with respect to each fixed rotor core 44. When the connecting pin 50 is in the first position 50a or the third position 50c, the magnetic pole 48b of each rotating rotor core 46 is in a position of the same polarity as the magnetic pole 48a of each fixed rotor core 44 in the axial direction. When the connecting pin 50 moves to the second position 50b, the magnetic pole 48b of each rotating rotor core 46 is positioned in the axial direction opposite to the magnetic pole 48a of each fixed rotor core 44. In this state, a short circuit of magnetic flux occurs between the magnetic pole 48a and the magnetic pole 48b, and less magnetic flux reaches the stator 60 from the rotor 20. In this way, by rotating each rotating rotor core 46 using the rotating mechanism 52, the magnetic flux generated by the rotor 20 can be changed.

[0013] As shown in FIGS. 1 and 2 , an introduction path 44b is provided inside each fixed rotor core 44. In this embodiment, each introduction path 44b communicates with a cooling path 22a provided inside the shaft 22. The cooling path 22a cools the shaft 22 with lubricating liquid 70 flowing through the cooling path 22a. The cooling path 22a extends along the rotation axis AX. Each introduction path 44b introduces the lubricating liquid 70 supplied from the cooling path 22a into the corresponding slit hole 44a. The communication opening of the slit hole 44a with the introduction path 44b is located approximately in the center of the fixed rotor core 44 in the axial direction. The lubricating liquid 70 introduced into each slit hole 44a is discharged from both axial ends of the fixed rotor core 44. The discharged lubricating liquid 70 cools the multiple magnetic poles 48a of the fixed rotor core 44. This expands the operating range of the motor and improves motor performance. Furthermore, the lubricating liquid 70 discharged from both axial ends of each fixed rotor core 44 can also cool the windings (not shown) of the stator 60 that are radially opposed to the fixed rotor core 44 .

[0014] In the rotor 20 of this embodiment, the multiple rotating rotor cores 46 are connected by connecting pins 50 extending through the slits 44a of each fixed rotor core 44. Therefore, when the connecting pins 50 move within the slits 44a, the multiple rotating rotor cores 46 rotate together relative to the shaft 22. As described above, each fixed rotor core 44 is provided with an introduction path 44b for introducing lubricating liquid 70 into the slits 44a. With this configuration, the lubricating liquid 70 introduced from the introduction path 44b into the slits 44a functions as a buffer when the connecting pins 50 move within the slits 44a. This reduces contact between the connecting pins 50 and the inner edges of each fixed rotor core 44. This reduces contact noise caused by contact between the connecting pins 50 and each fixed rotor core 44, and also suppresses wear between the connecting pins 50 and each fixed rotor core 44.

[0015] In particular, in this embodiment, in each fixed rotor core 44, the lubricating liquid 70 is supplied from the cooling path 22a of the shaft 22 to the slit holes 44a through the introduction path 44b of the fixed rotor core 44. Therefore, the lubricating liquid 70 can be supplied uniformly to the slit holes 44a of each fixed rotor core 44.

[0016] However, the lubricating liquid 70 introduced into the slit holes 44a may be supplied via an introduction path from another cooling path provided other than the shaft 22. The other cooling path may axially penetrate the multiple fixed rotor cores 44 and the multiple rotating rotor cores 46. In this case, the lubricating liquid 70 may be supplied from one end of the rotor core to the other end. However, compared to the configuration of this embodiment in which the lubricating liquid 70 is supplied from the cooling path 22a of the shaft 22, the other cooling path extends across the gaps between the multiple fixed rotor cores 44 and the rotating rotor cores 46, which may cause the lubricating liquid 70 to leak from each gap. Therefore, it is difficult to uniformly supply the lubricating liquid 70 to the slit holes 44a of each fixed rotor core 44. In this respect, the configuration of this embodiment is advantageous. [Explanation of symbols]

[0017] 20: rotor, 22: shaft, 44: fixed rotor core, 44a: slit hole, 44b: introduction path, 46: rotating rotor core, 46a: through hole, 50: connecting pin, 52: rotating mechanism, 70: lubricating liquid

Claims

[Claim 1] A rotor, A shaft, a plurality of fixed rotor cores fixed to the shaft; a plurality of rotating rotor cores attached to the shaft and rotatable around the shaft relative to the shaft; a connecting pin that connects the plurality of rotating rotor cores; a rotation mechanism connected to the plurality of rotating rotor cores connected via the connecting pins, and rotating the plurality of rotating rotor cores relative to the shaft; Equipped with the plurality of fixed rotor cores and the plurality of rotating rotor cores are alternately arranged in the axial direction of the shaft, Each of the plurality of fixed rotor cores is provided with a slit hole that penetrates the fixed rotor core in the axial direction and extends along a circumferential direction of the shaft, the connecting pin extends between the plurality of rotating rotor cores through the slit holes of each of the plurality of fixed rotor cores, Each of the plurality of fixed rotor cores is further provided with an introduction path for introducing lubricating liquid into the slit hole. Rotor.

Images