Rotary electric machine

Abstract

To provide a rotary electric machine capable of improving a cooling performance while comprising a pulse generator.SOLUTION: A rotary electric machine 1 comprises: a rotor 10 including a rotor shaft 11 and a rotor core 12 which is fixed along an outer periphery of the rotor shaft; a bearing 30 which supports the rotor shaft in a freely rotatable manner; a bearing bracket 32 which is formed at an outer peripheral side of the bearing and includes a suction port 34; a stator 20 including a stator core disposed radially outside of the rotor core; a stator frame 36 which is disposed coaxially with the rotor shaft and fixes the stator core while disposing it oppositely to the rotor core and in which the stator core and the rotor core are stored; disc members 50 and 55 which are coaxially disposed in an axial end of the rotor; an encoder which has an annular shape and in which a plurality of projections is formed at the peripheral edge thereof; and a plurality of encode mounting members 52 which is disposed at peripheral edges of the disc members opposed to the bearing bracket, holds the encoder coaxially with the rotor and separately from the disc members and is formed in a tabular shape in a radial direction when viewed in an axial direction of the disc members.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] An embodiment of the present invention relates to a rotating electric machine. [Background technology]

[0002] For electric motors (rotating electric motors) used to drive trains and other vehicles, a technique is known in which a pulse generator (hereinafter sometimes referred to as PG) is provided to acquire the rotation speed of the electric motor. The pulse generator has, for example, a disk (encoder) that is coaxially attached to the rotor end of the electric motor and has protrusions on its peripheral end, and a sensor that detects the unevenness of the encoder's protrusions. The encoder rotates as the rotor rotates. The sensor generates a pulse signal based on the unevenness of the protrusions of the rotating encoder.

[0003] On the other hand, motors used to drive trains and other vehicles may have a totally enclosed structure that does not take in outside air. A motor with a totally enclosed structure is called a totally enclosed motor. Totally enclosed motors are required to improve cooling performance and reduce losses. One way to improve the cooling performance of a totally enclosed motor is to use a fan that rotates outside the machine in sync with the rotor at the end of the rotor. In this case, cooling performance can be improved by making the fan larger.

[0004] However, since a motor equipped with a pulse generator has an encoder on the outside of the rotor end, the fan is provided on the inner diameter side of the encoder. Therefore, there is a physical limit to the amount of space available to enlarge the fan. In other words, in a motor equipped with a pulse generator, it is difficult to improve the cooling performance by using a fan that is synchronized with the rotor. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication 2012-175757 Summary of the Invention [Problem to be solved by the invention]

[0006] As described above, in a conventional electric motor equipped with a pulse generator, there was a problem in that it was difficult to improve the cooling performance by using a fan synchronized with the rotor.

[0007] The present invention has been made in view of the above-mentioned problems, and has an object to provide a rotating electric machine that is equipped with a pulse generator and has improved cooling performance. [Means for solving the problem]

[0008] The rotating electric machine of the embodiment comprises a rotor shaft, a rotor having a rotor core fixed along the outer periphery of the rotor shaft, a bearing for rotatably supporting the rotor shaft, a bearing bracket formed on the outer periphery of the bearing and having an air intake port, a stator having a stator core arranged radially outward of the rotor core, a stator frame arranged coaxially with the rotor shaft, fixing the stator core opposite the rotor core, and accommodating the stator core and the rotor core, a disk member arranged coaxially at the axial end of the rotor and having a circular planar shape, an encoder having an annular shape and having multiple protrusions formed on its peripheral end, and a plurality of encoder mounting members arranged on the peripheral portion facing the bearing bracket of the disk member, holding the encoder coaxially with the rotor and spaced apart from the disk member, and formed in a plate shape radially when viewed from the axial direction of the disk member. [Brief description of the drawings]

[0009] [Figure 1] 1 is a vertical sectional view showing a configuration of a rotating electric machine according to a first embodiment. [Diagram 2] FIG. 2 is a front view showing a configuration of a disk member in the rotating electric machine according to the first embodiment. [Diagram 3] 2 is a vertical cross-sectional view showing a periphery of a disk member in the rotating electric machine according to the first embodiment. FIG. [Figure 4] FIG. 2 is a diagram showing an air flow in the rotating electric machine of the first embodiment. [Diagram 5] FIG. 6 is a vertical sectional view showing the configuration of a rotating electric machine according to a second embodiment. [Figure 6] FIG. 11 is a front view showing a configuration of a disk member in a rotary electric machine according to a second embodiment. [Figure 7] 13 is a vertical cross-sectional view showing a periphery of a disk member in a rotary electric machine according to a second embodiment. FIG. [Figure 8] FIG. 11 is a diagram showing an air flow in a rotating electric machine according to a second embodiment. [Figure 9] FIG. 11 is a vertical sectional view showing the configuration of a rotating electric machine according to a third embodiment. [Figure 10] FIG. 11 is a front view showing the configuration of a disk member in a rotating electric machine according to a third embodiment. [Figure 11] 13 is a vertical cross-sectional view showing the periphery of a disk member in a rotating electric machine according to a third embodiment. FIG. [Figure 12] FIG. 11 is a diagram showing an air flow in a rotating electric machine according to a third embodiment. [Figure 13] FIG. 13 is a front view showing a configuration of a disk member in a rotary electric machine according to a fourth embodiment. [Figure 14] FIG. 4 is a vertical cross-sectional view showing the configuration of a rotating electric machine of a comparative example. [Figure 15] FIG. 4 is a front view showing the configuration of a disk member in a rotating electric machine of a comparative example. [Figure 16] 6 is a vertical cross-sectional view showing a periphery of a disk member in a rotating electric machine of a comparative example. FIG. [Figure 17] FIG. 4 is a diagram showing an air flow in a rotating electric machine of a comparative example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] (First embodiment) Hereinafter, a rotating electric machine according to a first embodiment will be described with reference to the drawings. Fig. 1 is a vertical cross-sectional view showing the configuration of the rotating electric machine according to the first embodiment. Fig. 2 is a front view showing the configuration of a disk member in the rotating electric machine according to the first embodiment. Fig. 3 is a vertical cross-sectional view showing the periphery of a disk member in the rotating electric machine according to the first embodiment.

[0011] As shown in FIGS. 1 and 2, a rotating electric machine 1 of the embodiment includes a rotor 10, a stator 20, a rotor shaft 11, a bearing 30, a bearing bracket 32, an intake port wall 33, a stator frame 36, and a frame 38.

[0012] The rotor 10 has a rotor core 12, a plurality of conductor bars (not shown) housed in the rotor core 12, and end rings (short-circuit rings) 14 connected to both ends of the conductor bars. The rotor 10 can rotate around a rotor shaft 11 as a rotation axis.

[0013] Rotor core 12 is an iron core fixed along the outer periphery of rotor shaft 11. Rotor core 12 has a generally cylindrical shape along rotor shaft 11. Rotor core 12 can rotate around rotor shaft 11 as the rotation axis.

[0014] The end ring 14 is a conductive member that shorts the conductive bars (not shown).

[0015] The rotor shaft 11 is a member that forms the rotation axis of the rotor 10. The rotor shaft 11 is supported by a bearing bracket 32 ​​via a bearing 30. The rotor shaft 11 rotates the rotor 10 in the circumferential direction.

[0016] The bearing 30 is a mechanism for supporting the rotor shaft 11 so as to be rotatable in the circumferential direction.

[0017] The bearing bracket 32 ​​is a member that fixes the bearing 30. The bearing bracket 32 ​​faces the axial end of the rotor core 12 and is formed so as to cover the axial end of the rotor core 12. A portion of the bearing bracket 32 ​​forms a part of the airflow passage. The bearing bracket 32 ​​has an air intake 34 near the outer periphery of the bearing 30.

[0018] The air intake wall 33 is a member that forms a passage for taking in air from the outside of the rotating electric machine 1. The air intake wall 33 is connected to the end of the bearing bracket 32 ​​on the bearing 30 side, and is formed so as to extend toward the rotor 10. The air intake wall 33, together with the wall surfaces of the bearing bracket 32 ​​and the bearing 30, forms a passage for airflow.

[0019] The air intake 34 is an opening formed in the bearing bracket 32 ​​connected to an airflow passage formed by the air intake wall 33. The air introduced from the air intake 34 passes through the passage formed by the air intake wall 33 and reaches the rotor 10.

[0020] The stator 20 has a stator core 22 and a stator winding 24 .

[0021] The stator core 22 is an iron core disposed around the rotor core 12. The stator core 22 is fixed by a stator frame .

[0022] The stator windings 24 are coils of wire having portions disposed in stator slots formed in the stator core 22 .

[0023] The stator frame 36 is a member that fixes the stator core 22 to face the rotor core 12. The stator frame 36 has a substantially cylindrical shape, and is disposed coaxially with the rotor shaft 11. The stator frame 36 is formed so as to cover the end of the stator core 22. The stator frame 36, together with the bearing bracket 32 ​​and the frame 38, can function as a container that houses the rotor 10 and the stator 20.

[0024] The stator frame 36 is bent toward the rotor shaft 11 at a position corresponding to a peripheral portion of a disk member 50 described later. The stator frame 36 is formed to extend from the bend point toward the rotor shaft 11. The stator frame 36 has a stator frame edge portion 37 extending in a direction approximately perpendicular to the axial direction of the rotor shaft 11. In other words, the stator frame 36 has a shape that extends in the axial direction of the rotor shaft 11, passes through the bend point, and extends in a direction approximately perpendicular to the axial direction of the rotor shaft 11.

[0025] The stator frame edge 37 is an end of the stator frame 36 extending in the direction of the rotor shaft 11. The stator frame edge 37 forms a wall surface integral with the peripheral edge of a disk member 50, which will be described later. This wall surface forms the wall surface of the airflow passage.

[0026] The frame 38 is a member that supports the stator frame 36 .

[0027] Thus, the rotating electric machine 1 is a totally enclosed motor having the rotor 10 and the stator 20 covered by the stator frame 36 and the bearing bracket 32.

[0028] As shown in FIG. 1, the rotating electric machine 1 includes a disk member 50, an encoder mounting member 52, an encoder 60, and a sensor 70.

[0029] 2 and 3, the disk member 50 is a member having a disk shape. The disk member 50 is formed coaxially along the outer periphery of the rotor shaft 11 at the axial end of the rotor core 12. The disk member 50 has a circular flat surface 50a that is inclined in the axial direction of the rotor shaft 11 from the axial end of the rotor core 12 toward the stator frame edge portion 37 of the stator frame 36.

[0030] The circular flat surface 50a of the disk member 50 is formed so as to extend from the axial end of the rotor core 12 in a direction away from the axial direction of the rotor shaft 11 toward the bearing bracket 32. The peripheral edge of the disk member 50 faces the stator frame edge 37 with a gap 51 therebetween.

[0031] The encoder mounting member 52 is a member that holds the encoder 60 at a position spaced apart from the peripheral surface of the disk member 50. The encoder mounting member 52 is disposed on the side of the disk member 50 that faces the bearing bracket 32. The encoder mounting member 52 has a height in the axial direction of the rotor shaft 11 when disposed on the disk member 50. In other words, the encoder mounting member 52 holds the encoder 60 by separating it from the disk member 50 by this height, forming a space. The encoder mounting member 52 has fin portions 52a formed along the surface of the disk member 50.

[0032] The fin portion 52a is a member formed integrally with the encoder mounting member 52 disposed on the periphery of the disk member 50. As shown in Figures 2 and 3, the fin portion 52a has a plate shape extending from the encoder mounting member 52 toward the center of the disk member 50. When the disk member 50 rotates in accordance with the rotation of the rotor shaft 11, the fin portion 52a generates an airflow that flows radially from the center of the disk member 50.

[0033] The encoder 60 is a plate-like member having an annular shape. The encoder 60 can be manufactured using, for example, iron. The encoder 60 has a diameter size that is approximately the same as the outer diameter of the disk member 50. The encoder 60 is disposed on the bearing bracket 32 ​​side of the disk portion 50 via an encoder mounting member 52. The encoder 60 can be fixed to the encoder mounting member 52 by, for example, a bolt 62. As shown in FIG. 2, the encoder 60 has a hole (not shown) at a position corresponding to the position of the encoder mounting member 52, and can be fixed to the encoder mounting member 52 by the bolt 62.

[0034] The encoder 60 has a plurality of protrusions 60a on its peripheral end surface. The plurality of protrusions 60a are formed at equal intervals on the peripheral end surface of the encoder 60. The plurality of protrusions 60a perform a circular motion (rotate) on the circumference of the encoder 60 as the rotor 10 and the disk member 50 rotate.

[0035] The sensor 70 detects the protrusions 60a of the encoder 60 and generates a pulse signal. The sensor 70 can obtain a pulse signal by detecting a plurality of protrusions 60a. The sensor 70 may calculate the rotation speed of the rotor 10 based on the generated pulse signal. The sensor 70 is disposed between the bearing bracket 32 ​​and the stator frame 36. A detection unit of the sensor 70 is fixed on the rotation surface of the encoder 60 so as to face the protrusions 60a of the encoder 60. The sensor 70 can adopt any method as long as it can detect the protrusions 60a of the rotating encoder 60. Examples of a method for detecting the protrusions 60a by the sensor 70 include magnetic detection and optical detection using a light source.

[0036] (Operation of the first embodiment) The operation of the rotating electric machine 1 of the first embodiment will be described with reference to FIG.

[0037] When the rotating electric machine 1 is started and the rotor 10 and rotor shaft 11 rotate, the disk member 50 rotates coaxially. When the disk member 50 rotates, the encoder 60 fixed via an encoder mounting member 52 provided on the periphery of the disk member 50 rotates. When the encoder 60 rotates, the protrusion 60a makes a circular motion around the circumference of the encoder 60 in accordance with the rotation. The sensor 70 detects the protrusion 60a passing near the end and generates a pulse signal.

[0038] When the disk member 50 rotates, the encoder mounting member 52 disposed on the peripheral portion of the disk member 50 makes a circular motion in the circumferential direction of the disk member 50. The encoder mounting member 52 includes a fin portion 52a formed integrally therewith and extending toward the center of the disk member 50, and therefore the fin portion 52a also makes a circular motion in the circumferential direction of the disk member 50 together with the encoder mounting member 52. When the fin portion 52a makes a circular motion in the circumferential direction of the disk member 50, the disk member 50 functions as a centrifugal fan together with the fin portion 52a. That is, the circular motion of the fin portion 52a generates an airflow in the radial direction (radiating direction) from the center of the disk member 50. In the example shown in FIG. 4, the encoder mounting member 52 and the fin portion 52a are formed integrally, and therefore the fin portion that generates the airflow can be formed long.

[0039] The centrifugal fan function of the disk member 50 and the fin portion 52a draws air in through the intake port 34. The air drawn in through the intake port 34 passes through a passage formed by the bearing 30 and the intake port wall 33 and reaches the vicinity of the rotor shaft 11 in the center of the disk member 50. The air then passes from the vicinity of the rotor shaft 11 through a passage formed by the circular flat surface 50a of the disk member 50 and the opposing intake port wall 33 and reaches the fin portion 52a.

[0040] The fin portion 52a generates an airflow directed in the radial direction of the disk member 50 by the air that has reached the fin portion 52a. Since the encoder 60 of the embodiment is fixed at a distance from the disk member 50 via the encoder mounting member 52, the airflow generated by the fin portion 52a passes through the space between the disk member 50 and the encoder 60. The generated airflow is discharged through an exhaust port (not shown). In the example shown in FIG. 4, the airflow is shown passing through the space between the disk member 50 and the encoder 60 and the space between the stator frame 36 and the encoder 60, passing through the fin portion 52a along the circular plane 50a of the disk member 50, but is not limited thereto. The airflow may pass through a passage formed by the encoder 60 and the bearing bracket 32.

[0041] (Comparative Example) Here, a rotating electric machine of a comparative example will be described. Fig. 14 is a vertical cross-sectional view showing the configuration of the rotating electric machine of the comparative example. Fig. 15 is a front view showing the configuration of a disk member in the rotating electric machine of the comparative example. Fig. 16 is a vertical cross-sectional view showing the periphery of the disk member in the rotating electric machine of the comparative example.

[0042] The rotating electric machine of the comparative example has an encoder fixed directly to the periphery of a disk member. In the following description, elements common to the rotating electric machine 1 of the first embodiment are denoted by common reference numerals, and duplicated descriptions will be omitted.

[0043] As shown in FIG. 14, a rotating electric machine 100 of the comparative example includes a disk member 150, a fin portion 152, an encoder 60, and a sensor 70.

[0044] 15 and 16, the disk member 150 is a member having a disk shape. The disk member 150 is formed coaxially along the outer periphery of the rotor shaft 11 at the axial end of the rotor core 12. The disk member 150 has a circular flat surface 150a that is inclined in the axial direction of the rotor shaft 11 from the axial end of the rotor core 12 toward the stator frame edge portion 37 of the stator frame 36.

[0045] A circular flat surface 150a of the disk member 150 is formed so as to extend from the axial end of the rotor core 12 in a direction away from the axial direction of the rotor shaft 11 toward the bearing bracket 32. The peripheral edge of the disk member 150 faces the stator frame edge 37 with a gap 151 therebetween.

[0046] The encoder 60 is a plate-like member having an annular shape. The encoder 60 has a diameter size that is approximately the same as the outer diameter of the disk member 150. As shown in Fig. 14, the encoder 60 is disposed on a side of the peripheral portion 150b of the disk member 150 that faces the bearing bracket 32. The encoder 60 is fixed to the peripheral portion 150b of the disk member 150 by bolts 62, for example.

[0047] As shown in Fig. 14, the fin portion 152 is disposed on the side of the disk member 150 facing the bearing bracket 32. The fin portion 152 is disposed on the inner circumferential side of the peripheral portion 150b of the disk member 150, i.e., on the inner circumferential side of the encoder 60. As shown in Figs. 15 and 16, the fin portion 152 has a plate shape extending from the peripheral portion 150b of the disk member 50 toward the center. When the disk member 150 rotates in accordance with the rotation of the rotor shaft 11, the fin portion 152 generates an airflow that flows radially from the center of the disk member 150.

[0048] (Function of Comparative Example) The operation of the rotating electrical machine 100 of the comparative example will be described with reference to FIG.

[0049] When the disk member 150 rotates, the fin portion 152 makes a circular motion in the circumferential direction of the disk member 150. When the fin portion 152 makes a circular motion in the circumferential direction of the disk member 150, the disk member 150, together with the fin portion 152, functions as a centrifugal fan.

[0050] The fin portion 152 generates an airflow in the radial direction of the disk member 150. In the example shown in Fig. 17, the airflow passes along the circular plane 150a of the disk member 150, through the fin portion 152, and through a passage formed by the encoder 60 and the bearing bracket 32. This is because the encoder 60 is in contact with the entire circumference of the peripheral portion 150b of the disk member 150.

[0051] (Effects of the first embodiment) As shown in Figs. 14 to 17, the rotating electric machine 100 of the comparative example has the encoder 60 directly disposed around the entire periphery of the peripheral portion 150b of the disk member 150. On the other hand, as shown in Figs. 1 to 4, the rotating electric machine 1 of the first embodiment has the encoder 60 held via an encoder mounting member 52. That is, the encoder 60 of the first embodiment is spaced apart from the surface of the disk member 50 and forms an airflow passage. The rotating electric machine 1 of the first embodiment can improve the cooling effect by virtue of this airflow passage.

[0052] 14, the rotating electric machine 100 of the comparative example has a fin portion 152 disposed on the inner circumferential side of the encoder 60. On the other hand, the rotating electric machine 1 of the first embodiment has a fin portion 52a integrally formed in a plate shape along the circular flat surface 50a of the disk member 50 from the encoder mounting member 52. That is, the rotating electric machine 1 of the first embodiment can be provided with a fin portion of a larger size compared to the rotating electric machine 100 of the comparative example. This makes it possible to increase the amount of air in the airflow and improve the cooling performance without changing the outer diameter size of the disk member 50 or the encoder 60.

[0053] Furthermore, in the rotating electric machine 100 of the comparative example, the encoder 60 is fixed around the entire circumference of the peripheral portion 150b of the disk member 150. On the other hand, in the rotating electric machine 1 of the first embodiment, the encoder 60 is fixed via the encoder mounting member 52, and a space is formed between adjacent encoder mounting members 52. That is, in the rotating electric machine 1 of the first embodiment, the size of the encoder mounting member 52 for fixing the encoder 60 in the circumferential direction of the disk member 50 can be reduced to approximately the thickness of the fin portion 52a, so that the polar moment of inertia can be made smaller than that of the rotating electric machine 100 of the comparative example, and loss can be reduced.

[0054] Second embodiment Next, a rotating electric machine according to a second embodiment will be described. Fig. 5 is a vertical cross-sectional view showing the configuration of the rotating electric machine according to the second embodiment. Fig. 6 is a front view showing the configuration of a disk member in the rotating electric machine according to the second embodiment. Fig. 7 is a vertical cross-sectional view showing the periphery of a disk member in the rotating electric machine according to the second embodiment.

[0055] The rotating electric machine 2 of the second embodiment is obtained by modifying the shape of the encoder mounting member 52 in the rotating electric machine 1 of the first embodiment. In the following description, elements common to the rotating electric machine 1 of the first embodiment are denoted by common reference numerals, and duplicated description will be omitted.

[0056] As shown in FIG. 5, the rotating electric machine 2 of this embodiment includes a disk member 50, an encoder mounting member 53, an encoder 60, and a sensor 70.

[0057] 6 and 7, the disk member 50 is a member having a disk shape. The disk member 50 is formed coaxially along the outer periphery of the rotor shaft 11 at the axial end of the rotor core 12. The disk member 50 has a circular flat surface 50a that is inclined in the axial direction of the rotor shaft 11 from the axial end of the rotor core 12 toward the stator frame edge portion 37 of the stator frame 36.

[0058] The circular flat surface 50a of the disk member 50 is formed so as to extend from the axial end of the rotor core 12 in a direction away from the axial direction of the rotor shaft 11 toward the bearing bracket 32. The peripheral edge of the disk member 50 faces the stator frame edge 37 with a gap 51 therebetween.

[0059] The encoder mounting member 53 is a member that holds the encoder 60 at a position spaced apart from the peripheral surface of the disk member 50. The encoder mounting member 53 is disposed on the side of the peripheral portion of the disk member 50 that faces the bearing bracket 32. The encoder mounting member 53 has a height in the axial direction of the rotor shaft 11 when disposed on the disk member 50. In other words, the encoder mounting member 53 holds the encoder 60 at a position spaced apart from the disk member 50 by this height.

[0060] The encoder mounting member 53 of this embodiment does not include the fin portion 52a in the first embodiment. As shown in Fig. 6 and Fig. 7, the encoder mounting member 53 has a plate shape extending radially (extending toward the center) when viewed from the rotation axis direction of the disk member 50. That is, the encoder mounting member 53 itself functions as a fin portion. When the disk member 50 rotates in accordance with the rotation of the rotor shaft 11, the encoder mounting member 53 generates an airflow that flows radially from the center of the disk member 50.

[0061] (Operation of the second embodiment) The operation of the rotating electric machine 2 according to the second embodiment will be described with reference to FIG.

[0062] When the disk member 50 rotates, the encoder mounting member 53 disposed on the peripheral portion of the disk member 50 performs circular motion in the circumferential direction of the disk member 50. The encoder mounting member 53 itself has a plate shape extending toward the center of the disk member 50, so that the disk member 50 functions as a centrifugal fan together with the encoder mounting member 53. In other words, the circular motion of the encoder mounting member 53 generates an airflow in the radial direction (radiating direction) from the center of the disk member 50.

[0063] Air is taken in through the intake port 34 by the centrifugal fan function of the disk member 50 and the encoder mounting member 53. The air taken in through the intake port 34 passes through a passage formed by the bearing 30 and the intake port wall 33 and reaches the vicinity of the rotor shaft 11 in the center of the disk member 50. The air then passes from the vicinity of the rotor shaft 11 through a passage formed by the circular flat surface 50a of the disk member 50 and the opposing intake port wall 33 and reaches the encoder mounting member 53.

[0064] The encoder mounting member 53 generates an airflow in the radial direction of the disk member 50 by the air that reaches it. The generated airflow is discharged through an exhaust port (not shown). In the example shown in Fig. 8, the airflow is shown passing through a passage formed by the stator frame 36 and the encoder 60 along the circular plane 50a of the disk member 50 via the encoder mounting member 53, but is not limited to this. The airflow may also pass through a passage formed by the encoder 60 and the bearing bracket 32.

[0065] According to the rotating electric machine 2 of this embodiment, since it is provided with the encoder mounting member 53 formed in a plate shape, it is possible to make the polar moment of inertia smaller and reduce losses compared to the rotating electric machine 1 of the first embodiment.

[0066] Third embodiment Next, a rotating electric machine according to a third embodiment will be described.

[0067] Fig. 9 is a vertical cross-sectional view showing the configuration of a rotating electric machine according to a third embodiment, Fig. 10 is a front view showing the configuration of a disk member in the rotating electric machine according to the third embodiment, and Fig. 11 is a vertical cross-sectional view showing the periphery of a disk member in the rotating electric machine according to the third embodiment.

[0068] The rotating electric machine 3 of the third embodiment is obtained by adding a shroud member to the fin portion 52a of the encoder mounting member 52 in the rotating electric machine 1 of the first embodiment. In the following description, elements common to the first embodiment are denoted by common reference numerals, and duplicated description will be omitted.

[0069] As shown in FIG. 9, the rotating electric machine 3 has a disk member 50, an encoder mounting member 52, a shroud member 54, an encoder 60, and a sensor 70.

[0070] 10 and 11, the disk member 50 is a member having a disk shape. The disk member 50 is formed coaxially along the outer periphery of the rotor shaft 11 at the axial end of the rotor core 12. The disk member 50 has a circular flat surface 50a that is inclined in the axial direction of the rotor shaft 11 from the axial end of the rotor core 12 toward the stator frame edge portion 37 of the stator frame 36.

[0071] The circular flat surface 50a of the disk member 50 is formed so as to extend from the axial end of the rotor core 12 in a direction away from the axial direction of the rotor shaft 11 toward the bearing bracket 32. The peripheral edge of the disk member 50 faces the stator frame edge 37 with a gap 51 therebetween.

[0072] The encoder mounting member 52 is a member that holds the encoder 60 at a position spaced apart from the peripheral surface of the disk member 50. The encoder mounting member 52 is disposed on the side of the peripheral portion of the disk member 50 that faces the bearing bracket 32. The encoder mounting member 52 has a height in the axial direction of the rotor shaft 11 when disposed on the disk member 50. In other words, the encoder mounting member 52 holds the encoder 60 at a position spaced apart from the disk member 50 by this height. The encoder mounting member 52 has fin portions 52a formed along the surface of the disk member 50.

[0073] The fin portion 52a is a member formed integrally with the encoder mounting member 52 disposed on the periphery of the disk member 50. As shown in Figures 10 and 11, the fin portion 52a has a plate shape extending from the encoder mounting member 52 toward the center of the disk member 50. When the disk member 50 rotates in accordance with the rotation of the rotor shaft 11, the fin portion 52a generates an airflow that flows radially from the center of the disk member 50.

[0074] The shroud member 54 is a plate-like member disposed opposite the circular plane 50a and forming an air passage between the circular plane 50a and the fin portion 52a. As shown in Fig. 10 and Fig. 11, the shroud member 54 is formed in an annular plate shape that is substantially parallel to the circular plane 50a and covers the formation area of ​​the fin portion 52a from the axial direction. In the example shown in Fig. 10 and Fig. 11, the shroud member 54 is disposed at a position in contact with the inner peripheral edge portion of the encoder 60. That is, the area surrounded by the circular plane 50a, the fin portion 52a, the encoder mounting member 52, the shroud member 54, and the encoder 60 is formed as an air passage.

[0075] 10 and 11, the shroud member 54 has an annular shape. That is, the circular plane 50a and the shroud member 54 form an air passage not only in the vicinity of the fin portion 52a but also in the region between the adjacent fin portions 52a.

[0076] (Operation of the third embodiment) The operation of the rotating electric machine 3 of the third embodiment will be described with reference to FIG.

[0077] When the rotating electric machine 1 is started and the rotor 10 and rotor shaft 11 rotate, the disk member 50 rotates coaxially. When the disk member 50 rotates, the encoder 60 fixed via an encoder mounting member 52 provided on the periphery of the disk member 50 rotates. When the encoder 60 rotates, the protrusion 60a makes a circular motion around the circumference of the encoder 60 in accordance with the rotation. The sensor 70 detects the protrusion 60a passing near the end and generates a pulse signal.

[0078] When the disk member 50 rotates, the encoder mounting member 52 disposed on the peripheral portion of the disk member 50 makes a circular motion in the circumferential direction of the disk member 50. The encoder mounting member 52 includes a fin portion 52a formed integrally therewith and extending toward the center of the disk member 50, and therefore the fin portion 52a also makes a circular motion in the circumferential direction of the disk member 50 together with the encoder mounting member 52. When the fin portion 52a makes a circular motion in the circumferential direction of the disk member 50, the disk member 50 functions as a centrifugal fan together with the fin portion 52a. That is, the circular motion of the fin portion 52a generates an airflow in the radial direction (radiating direction) from the center of the disk member 50. In the example shown in FIG. 4, the encoder mounting member 52 and the fin portion 52a are formed integrally, and therefore the fin portion that generates the airflow can be formed long.

[0079] The centrifugal fan function of the disk member 50 and the fin portion 52a draws air in through the intake port 34. The air drawn in through the intake port 34 passes through a passage formed by the bearing 30 and the intake port wall 33 and reaches the vicinity of the rotor shaft 11 in the center of the disk member 50. The air then passes from the vicinity of the rotor shaft 11 through a passage formed by the circular flat surface 50a of the disk member 50 and the opposing intake port wall 33 and reaches the fin portion 52a.

[0080] The air that reaches the fin portion 52a passes through a passage formed by the circular plane 50a, the fin portion 52a, and the shroud member .

[0081] The fin portion 52a generates an airflow from the air that reaches the fin portion 52a in the radial direction of the disk member 50. The generated airflow is discharged through an exhaust port (not shown). In this embodiment, the airflow passes through the space between the circular plane 50a of the disk member 50 and the shroud member 54, passes through the fin portion 52a, and passes through a passage formed by the stator frame 36 and the encoder 60. That is, the air taken in from the intake port 34 can efficiently reach the fin portion 52a.

[0082] Generally, a structure including a shroud member has the effect of reducing loss and noise. According to the rotating electric machine 3 of this embodiment, an airflow passage is formed in the fin portion 52a by the circular flat surface 50a and the shroud member 54, so that the airflow generated by the fin portion 52a can be efficiently pushed out toward the outer periphery of the disk member 50, thereby reducing loss and noise.

[0083] (Fourth embodiment) Next, a rotating electric machine according to a fourth embodiment will be described.

[0084] 13 is a front view showing the configuration of a disk member in a rotating electric machine according to the fourth embodiment. A rotating electric machine 4 of the fourth embodiment is obtained by modifying the arrangement of an encoder mounting member 52 in a disk member 50 in the rotating electric machines 1 to 3 of the first to third embodiments. In the following description, elements common to the first to third embodiments are denoted by common reference numerals, and duplicated description will be omitted.

[0085] As shown in FIG. 1, the rotating electric machine 4 includes a disk member 55, an encoder mounting member 52, an encoder 60, and a sensor .

[0086] 13 and 3, the disk member 55 is a member having a disk shape. The disk member 55 is formed coaxially along the outer periphery of the rotor shaft 11 at the axial end of the rotor core 12. The disk member 55 has a circular flat surface 50a that is inclined in the axial direction of the rotor shaft 11 from the axial end of the rotor core 12 toward the stator frame edge portion 37 of the stator frame 36.

[0087] The circular flat surface 50a of the disk member 55 is formed so as to extend from the axial end of the rotor core 12 in a direction away from the axial direction of the rotor shaft 11 toward the bearing bracket 32. The peripheral edge of the disk member 50 faces the stator frame edge 37 with a gap 51 therebetween.

[0088] The encoder mounting member 52 is a member that holds the encoder 60 at a position spaced apart from the peripheral portion of the disk member 55. The encoder mounting member 52 is disposed on the side of the peripheral portion of the disk member 55 that faces the bearing bracket 32. The encoder mounting member 52 has a height in the axial direction of the rotor shaft 11 when disposed on the disk member 55. In other words, the encoder mounting member 52 holds the encoder 60 at a position spaced apart from the disk member 50 by this height. The encoder mounting member 52 has fin portions 52a formed along the surface of the disk member 55.

[0089] The fin portion 52a is a member formed integrally with the encoder mounting member 52 disposed on the periphery of the disk member 55. As shown in Fig. 13 and Fig. 3, the fin portion 52a has a plate shape extending from the encoder mounting member 52 toward the center of the disk member 55. When the disk member 55 rotates in accordance with the rotation of the rotor shaft 11, the fin portion 52a generates an airflow that flows radially from the center of the disk member 55.

[0090] 13, in the encoder mounting member 52 of this embodiment, the encoder mounting members 52 on the disk member 55 are not disposed at equal intervals on the circumference of the disk member 55. In the example shown in Fig. 13, an angle θ1 (first angle) formed by a line connecting the center of the disk member 55 and the first encoder mounting member 52x (first encoder mounting member) and a line connecting the center of the disk member 55 and the second encoder mounting member 52y (second encoder mounting member) is different from an angle θ2 (second angle) formed by a line connecting the center of the disk member 55 and the second encoder mounting member 52y (third encoder mounting member) and a line connecting the center of the disk member 55 and the third encoder mounting member 52z (fourth encoder mounting member).

[0091] It is known that when protrusions are provided at regular intervals on a rotating body, the air flow is disturbed at a specific frequency. In this case, the vibration spectrum is concentrated at the specific frequency, which causes noise. In the rotating electric machine 4 of this embodiment, the encoder mounting member 52 (and the fin portion 52a) are arranged at an uneven pitch (different pitches) on the disk member 55, which makes it possible to disperse the dominant frequency.

[0092] The intervals (angles) between adjacent encoder mounting members 52 may be such that all angles (e.g., θ1 to θn) have different values, or at least one angle (e.g., θ1) has a different value from the other angles (e.g., θ2 to θn). A few angles (e.g., 1 or 2 angles) may be different from the other angles. Furthermore, in the example shown in FIG. 13, θ1 and θ2 may be alternately arranged, or θ1 and θ2 may be consecutively arranged.

[0093] According to the rotating electric machine 4 of this embodiment, the arrangement angles (mounting angles) of the encoder mounting member and the fins with respect to the disk center are irregular and have an unequal pitch, so that the dominant frequency can be dispersed, thereby reducing noise.

[0094] Although several embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0095] 1,2,3,4...Rotary motor 10...Rotor 11...Rotor shaft 12...Rotor core 14. End Ring 20...Stator 22…Stator core 24…Stator winding 30...Bearing 32…Bearing bracket 33…Air intake wall 34…Air intake 36…Stator frame 38…Frame 50,55…Disc member 50a…Circular plane 51...Gap 52, 53...Encoder mounting parts 52a…Fin section 54...Shroud member 60…Encoder 60a…Protrusion 62…Volts 70…Sensor

Claims

1. A rotor shaft; a rotor having a rotor core fixed along an outer periphery of the rotor shaft; a bearing that rotatably supports the rotor shaft; a bearing bracket having an intake port formed on an outer periphery of the bearing; a stator having a stator core disposed radially outside the rotor core; a stator frame that is arranged coaxially with the rotor shaft, that faces and fixes the stator core to the rotor core, and that houses the stator core and the rotor core; a disk member having a circular planar shape and arranged coaxially at an axial end of the rotor; an encoder having an annular shape and a plurality of protrusions formed on a peripheral edge thereof; a plurality of encoder mounting members disposed on a peripheral portion of the disk member facing the bearing bracket, the encoder being spaced apart from the disk member and coaxial with the rotor, the encoder mounting members being formed in a plate shape in a radial direction as viewed in an axial direction of the disk member; A rotating electric machine comprising:

2. 2. The rotating electric machine according to claim 1, wherein each of the plurality of encoder mounting members includes a fin portion extending in a plate shape along a surface of the disk member toward a center of the disk member.

3. 3. The rotating electric machine according to claim 2, further comprising a shroud member formed in an annular shape at an axial end of the disk member at the fin portion, facing the disk member, and forming a space between the disk member and the fin portion.

4. In the plurality of encoder mounting members, a first angle formed by a line connecting the center of the disk member and a first encoder mounting member and a line connecting the center of the disk member and a second encoder mounting member adjacent to the first encoder mounting member, the angle is different from a second angle formed by a straight line connecting the center of the disk member and the third encoder mounting member and a straight line connecting the center of the disk member and a fourth encoder mounting member adjacent to the third encoder mounting member; 4. The rotating electric machine according to claim 1, wherein:

Images