JP2013070572A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine that provides effective cooling for a stator core and the like thereof.SOLUTION: A rotary electric machine includes a rotor 20, a stator core 30, and a stator frame 40 that surrounds the stator core 30. The rotor 20 has: an annular member 21a that is annularly-shaped and rotatable; a plurality of mounts 22 that are fixed to an outer circumferential surface of the annular member 21a; permanent magnets 23 that are fixed to the respective mounts 22; and ventilation passage boards that have surfaces facing outer circumferential sides of circumferential gaps, that cover the circumferential gaps from a radially outer side, while straddling between circumferentially adjacent pairs of the mounts 22, so as to form rotor ventilation passages 70 penetrating through axial direction, and that have ventilation through-holes 71 formed on downstream sides thereof.

Description

  The present invention relates to a rotating electrical machine having a rotor to which a permanent magnet is attached.

  The rotating electrical machine includes a rotor, a stator core that surrounds the rotor from the outside in the radial direction, and a stator frame that accommodates the stator core.

  The rotor rotates around a predetermined axis (rotation center axis). Some rotors have permanent magnets attached, for example. Some of such rotors have a base fixed to the outer periphery of an annular member, and a permanent magnet fixed to the base. Some rotors and stators are formed with ventilation paths for cooling them (for example, Patent Document 1).

  The stator has a stator core and a stator winding. Some of the stator cores are provided with ventilation paths for cooling the stator core. The cooling iron flows through this ventilation path, whereby the stator core is cooled. In this ventilation path, air flows in one direction in which the rotation center axis extends.

JP 2011-142735 A

  The ventilation path includes an axial flow path that flows in the axial direction and a radial flow path that flows in the radial direction. The axial flow path includes a gap formed between the rotor and the stator core in addition to the one formed in the stator core.

  The air flowing through the gap includes an air flowing in the axial direction and an air flowing in the radial direction. Since the flow path cross-sectional area of the radial flow path is larger than the flow path cross-sectional area of the gap, more air flows in the radial flow path on the upstream side in the axial direction.

  For this reason, the air flow rate may be different for each axial position of the axial flow path. If the flow path distribution is different, it is divided into a part where cooling is effectively performed and a part where it is inefficient.

  The present invention has been made to solve the above-described problems, and an object thereof is to efficiently cool a stator core and the like.

  In order to achieve the above object, a rotating electrical machine according to the present invention includes a rotor that can rotate around a predetermined axis, a stator core that surrounds the rotor from the outside in the radial direction, and the stator core from the outside in the radial direction. A rotating electrical machine having a stator frame configured to surround the rotor, wherein the rotor is an annular shape disposed so as to surround the shaft from the outside in the radial direction, and is a circle that can rotate coaxially around the shaft. An annular member, a plurality of pedestals each extending in the axial direction and fixed to the outer circumferential surface on the radially outer side of the annular member so as to form a circumferential gap with each other, and radially outward of each of the pedestals, respectively A plate member formed with a plurality of fixed permanent magnets and a plate surface opposite to the outer peripheral surface of the radial gap, and covers the circumferential gap from the outside in the radial direction while straddling the pedestal adjacent in the circumferential direction. Pierce in the direction A ventilation passage plate material having at least one through hole formed in the plate surface, and an air flow of the through hole with respect to the surface area of the plate surface through the ventilation passage. It is characterized by being formed so that the downstream side is larger than the upstream side.

  According to the present invention, it is possible to efficiently cool the stator core and the like.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic partial cross-sectional view of a rotating electrical machine according to a first embodiment of the present invention, showing an upper half of the center of rotation. It is the side view which showed the II-II arrow view of FIG. 1 partially. FIG. 3 is an enlarged side view of a part III in FIG. 2. It is the top view which showed the IV-IV arrow of FIG. 1 partially. It is the side view which showed partially the VV arrow of FIG. It is the general | schematic fragmentary top view which showed partially the rotor of the rotary electric machine of 2nd Embodiment which concerns on this invention, Comprising: It is a figure corresponding to FIG. 4 of 1st Embodiment. It is the general | schematic fragmentary top view which showed partially the rotor of the rotary electric machine of 3rd Embodiment which concerns on this invention, Comprising: It is a figure corresponding to FIG. 4 of 1st Embodiment. It is the general | schematic fragmentary top view which showed partially the rotor of the rotary electric machine of 4th Embodiment which concerns on this invention, Comprising: It is a figure corresponding to FIG. 4 of 1st Embodiment.

  Embodiments of a rotating electrical machine according to the present invention will be described below with reference to the drawings.

[First Embodiment]
A first embodiment will be described with reference to FIGS. FIG. 1 is a schematic partial cross-sectional view of the rotating electrical machine of the present embodiment, showing the upper half of the center of rotation. FIG. 2 is a side view partially showing an II-II arrow view of FIG. FIG. 3 is an enlarged side view of a portion III in FIG.

  4 is a top view partially showing the IV-IV arrow of FIG. FIG. 5 is a side view partially showing the VV arrow view of FIG. 1.

  First, the configuration of the rotating electrical machine of the present embodiment will be described.

  The rotating electrical machine includes a rotor 20 that rotates around the rotation center shaft 1, a shaft member 10 to which the rotor 20 is attached, a stator core 30, and a stator frame 40 that accommodates these members ( FIG. 1).

  The shaft member 10 is rotatably supported by a bearing (not shown) and rotates coaxially around the rotation center shaft 1.

  The rotor 20 has an annular shape as a whole and surrounds the shaft member 10. The stator core 30 has an annular shape that surrounds the outer side of the rotor 20 from the outer side in the radial direction with a predetermined radial interval (gap 61a).

  The configurations of the rotor 20 and the stator core 30 will be described below. First, the rotor 20 will be described.

  The rotor 20 includes an annular member 21a, a plurality of support members 21b, a plurality of pedestals 22, a plurality of permanent magnets 23, and a plurality of ventilation path plates 28.

  A plurality of support members 21 b are fixed to each of the four axial positions of the shaft member 10, and can be rotated together with the shaft member 10. The support members 21b fixed at the respective axial positions extend radially from the respective axial positions to the inner peripheral surface of the annular member 21a to support the annular member 21a.

  The annular member 21a is an annular member that is supported by the support member 21b and is rotatable, and surrounds the shaft member 10 from the outside in the radial direction.

  A plurality of pedestals 22 are arranged in the circumferential direction (left and right direction in FIGS. 2 and 3) on the outer peripheral surface of the annular member 21a. These pedestals 22 are arranged so as to form a circumferential gap therebetween. These circumferential gaps form a rotor ventilation path 70 described later (FIGS. 2 and 3).

  Each pedestal 22 is a plate-like member in which a long rectangle is formed in the axial direction, and a seat surface 22a is formed on the outer side in the radial direction. The permanent magnet 23 is attached to each seating surface 22a by adhesion.

  A fixing groove 22b extending in the axial direction is formed at a portion of each base 22 facing in the circumferential direction. An air passage plate member is fitted into the fixing groove 22b.

  The ventilation path plate 28 is a substantially rectangular plate, and the long side is fitted in the fixed groove 22b. At this time, each long side of the ventilation path plate member 28 covers the circumferential gap from the outside in the radial direction so as to connect the pedestals adjacent in the circumferential direction. That is, the rectangular plate surface of the ventilation path plate member 28 is disposed so as to face the outer peripheral surface of the circumferential gap.

  As a result, the circumferential gap is surrounded by the outer peripheral surface of the annular member 21a, the adjacent pedestal 22 and the plate member 28 for the air passage. The circumferential gap surrounded by these forms a rotor ventilation path 70 through which air can flow in the axial direction.

  The ventilation path plate member 28 is formed with a substantially rectangular ventilation through hole 71 which is long in the axial direction on the downstream side (left side in FIGS. 1 and 4). By this through hole 71 for ventilation, the air flowing through the rotor ventilation path 70 can flow out to the gap 61a.

  Next, the stator core 30 will be described.

  As described above, the stator core 30 is configured to surround the rotor 20 from the outside in the radial direction, and is a ring-shaped member as a whole. The inner peripheral surface of the stator core 30 is arranged so as to leave a predetermined radial interval (gap 61a) from the outer peripheral surface (radially outer side) of the rotor 20. The gap 61a is one of axial ventilation paths 61 described later. The stator core 30 includes six steel plate groups 31 and five duct plates 38.

  Although not shown in detail in the steel plate group 31, a plurality of steel plates 33 are laminated in the axial direction. The steel plate 33 has a disk shape with a hole formed in the center. The rotor 20 is disposed so as to pass through this hole. Moreover, the inner side groove | channel 34 is formed in the radial inside of each steel plate 33, and the outer side groove | channel 35 is formed in the outer side (FIG. 5).

  A plurality of inner grooves 34 are formed at equal intervals in the circumferential direction. The inner groove 34 formed in each steel plate 33 communicates in the axial direction when the steel plates 33 are laminated to form the steel plate group 31. Furthermore, when each steel plate group 31 is arranged in the axial direction, each inner circumferential groove communicates in the axial direction. A stator winding 37 is wound around the inner groove 34 communicated.

  A plurality of outer grooves 35 are formed at equal intervals in the circumferential direction. The outer groove 35 formed in each steel plate 33 communicates in the axial direction when the steel plates 33 are laminated to form the steel plate group 31. Furthermore, when each steel plate group 31 is arranged in the axial direction, each outer peripheral groove communicates in the axial direction. The communicated outer groove 35 forms a cooling air flow path (axial ventilation path 61).

  The outer groove 35 is closed at the radially outer opening inside the stator frame 40. The configuration of the stator frame 40 will be described later.

  The duct plates 38 are respectively disposed between the steel plate groups 31 arranged in the axial direction. That is, the steel plate groups 31 and the duct plates 38 are alternately arranged in the axial direction. Although not shown in detail, the duct plates 38 are disk-shaped plates each having a hole in the center, and a plurality of bar members are attached to at least one holed disk surface. These bars are attached radially. Between each bar, a flow path (radial air passage 62) is formed in the cooling air.

  The stator frame 40 is configured to surround the stator core 30 from the outside in the radial direction. The inner periphery of the stator frame 40 is in contact with the outer periphery of the stator core 30. The opening on the radially outer side of the axial ventilation passage 61 is closed by the inner surface of the stator frame 40.

  A plurality of fins (not shown) that are long in the axial direction are attached to the outer peripheral surface of the stator frame 40. These fins are attached at intervals in the circumferential direction.

  Although the detailed illustration of the stator frame 40 is omitted, the shaft member 10 is fixed. The stator frame 40 is formed with an exhaust port (not shown) through which air taken from outside and circulated through the stator frame 40 is exhausted. The air flow for cooling may be generated by providing a fan or the like in the stator frame 40.

  Then, the effect | action of this embodiment is demonstrated.

  Most of the air sucked into the stator frame 40 flows into one of the rotor ventilation path 70 formed in the rotor 20, the axial ventilation path 61 formed in the stator core 30, and the gap 61a.

  The air that has flowed into the axial ventilation path 61 flows in the axial direction toward the left side of FIG. Part of the air flowing into the gap 61 a flows in the axial direction, and part flows into the radial ventilation path 62 of the duct plate 38. The air that has flowed out of the radial ventilation path 62 flows into the axial ventilation path 61 of the stator core 30 and flows in the axial direction.

  At this time, part of the heat of the air flowing through the axial ventilation path 61 is radiated from the fins or the like outside the stator frame 40 via the outer surface of the stator frame 40.

  The air that has flowed to the downstream end of the stator core 30 is discharged from the exhaust port of the stator frame 40 to the outside of the stator frame 40.

  A plurality of radial ventilation paths 62 are formed radially on one duct plate 38. When the flow path of the gap 61a is regarded as one annular flow path, the flow area of the radial ventilation path 62 is usually larger than the flow area of the gap 61a at the axial position where the duct plate 38 is located.

  Since a plurality of radial ventilation paths 62 are formed, the amount of air flowing in the gap 61a is reduced in the axial direction and hardly flows downstream. In this state, in the vicinity of the downstream side of the gap 61a, the cooling effect on the inner peripheral side of the stator core 30 is lower than that on the upstream side.

  The air that has flowed into the rotor ventilation path 70 flows almost in the axial direction toward the left side in FIG. 2 on the upstream side (right side in FIG. 2). Part of the air flowing through the rotor ventilation path 70 passes through the ventilation through hole 71 formed in the ventilation path plate 28 and flows out into the gap 61a.

  As described above, since a plurality of the radial ventilation paths 62 are formed, it is easy to flow into the radial ventilation path 62 on the upstream side in the axial direction. This is because the flow passage cross-sectional area of the radial ventilation path 62 is larger than the flow path cross-sectional area of the gap 61a as described above, and thus the flow resistance is smaller in the radial ventilation path 62 than the gap 61a. In addition, this is also because the fan 20 of rotation of the rotor 20 tends to flow outward in the radial direction.

  Usually, the heat generation of the permanent magnet 23 and the pedestal 22 is smaller than the heat generation of the stator core 30. For this reason, the air flowing out from the ventilation through hole 71 has an effect of cooling the stator core 30.

  In the gap 61 a, a larger amount of air than the amount of air flowing in the axial direction flows into the radial ventilation path 62. For this reason, the amount of air flowing from the upstream of the gap 61a is reduced downstream of the gap 61a. As a result, the flow rate of the air on the downstream side of the gap 61 a that is less likely to flow of air is supplemented by the air flowing out of the ventilation through hole 71 of the rotor ventilation path 70. As a result, variation in the amount of air flowing through the axial ventilation path 61 and the gap 61a depending on the position in the axial direction is suppressed.

  As can be seen from the above description, according to this embodiment, the stator core 30 and the like can be efficiently cooled.

[Second Embodiment]
A second embodiment will be described with reference to FIG. FIG. 6 is a schematic partial top view partially showing the rotor 20 of the rotating electrical machine of the present embodiment, and corresponds to FIG. 4 of the first embodiment. In addition, this embodiment is a modification of 1st Embodiment (FIGS. 1-5), Comprising: The same code | symbol is attached | subjected to the same part or similar part as 1st Embodiment, and duplication description is carried out. Omitted. Further, the overall configuration of the rotating electrical machine of the present embodiment is the same as that of FIG. 1 described in the first embodiment.

  The ventilation through holes 71 of the ventilation path plate material 28 of the present embodiment are each formed in a round hole shape, and five are formed closer to the downstream side.

  Thereby, the ventilation through hole 71 can be formed in a portion that easily flows in the radial ventilation path 62. For example, the radial direction ventilation path 62 and the axial position of each ventilation through hole 71 may be aligned.

  Therefore, according to the present embodiment, the same effects as those of the first embodiment can be obtained, and the way in which air flows downstream can be adjusted at the design stage.

[Third Embodiment]
A third embodiment will be described with reference to FIG. FIG. 7 is a schematic partial top view partially showing the rotor 20 of the rotating electrical machine of the present embodiment, and corresponds to FIG. 4 of the first embodiment. In addition, this embodiment is a modification of 1st Embodiment (FIGS. 1-5), Comprising: The same code | symbol is attached | subjected to the same part or similar part as 1st Embodiment, and duplication description is carried out. Omitted. Further, the overall configuration of the rotating electrical machine of the present embodiment is the same as that of FIG. 1 described in the first embodiment.

  The circumferential width (vertical direction in FIG. 7) of the ventilation through hole 71 of the ventilation path plate member 28 of the present embodiment is formed so as to gradually increase toward the downstream side. As a result, the same effect as in the first embodiment can be obtained, and the amount of air flowing further downstream can be increased.

[Fourth Embodiment]
A fourth embodiment will be described with reference to FIG. FIG. 8 is a schematic partial top view partially showing the rotor 20 of the rotating electrical machine of the present embodiment, and corresponds to FIG. 4 of the first embodiment. In addition, this embodiment is a modification of 1st Embodiment (FIGS. 1-5), Comprising: The same code | symbol is attached | subjected to the same part or similar part as 1st Embodiment, and duplication description is carried out. Omitted. Further, the overall configuration of the rotating electrical machine of the present embodiment is the same as that of FIG. 1 described in the first embodiment.

  The ventilation path plate member 28 of this embodiment is a combination of the features of the third embodiment with the features of the second embodiment. That is, by increasing the downstream hole diameter, the same effect as that of the third embodiment can be obtained.

[Other Embodiments]
The description of the above embodiment is an example for explaining the present invention, and does not limit the invention described in the claims. Moreover, each part structure of this invention is not restricted to the said embodiment, A various deformation | transformation is possible within the technical scope as described in a claim.

  Moreover, in the said embodiment, although the shaft member is rotatably supported by the bearing, it is not restricted to this. For example, the shaft member may be fixed, a bearing may be attached to the shaft member, and the support member 21b may be fixed to the outer periphery of the bearing. In this case, the center of rotation can be used as a ventilation path. The bearing in this case is configured such that the side in contact with the shaft member is fixed and the radially outer side (outer peripheral surface) rotates. In this case, an end portion of the shaft member may be opened, and air may be taken into the stator frame 40 by sucking air from the opening.

DESCRIPTION OF SYMBOLS 1 ... Rotation center axis | shaft 10 ... Shaft member 20 ... Rotor 21a ... Ring member 21b ... Support member 22 ... Base 22a ... Seat surface 22b ... Fixed groove 23 ... Permanent magnet 28 ... Plate material for ventilation path 30 ... Stator core 31 ... Steel plate group 33 ... Steel plate 34 ... Inner groove 35 ... Outer groove 37 ... Stator winding 38 ... Duct plate 40 ... Stator frame 61 ... Axial air passage 61a ... Air gap 62 ... Radial air passage 70 ... Rotor air passage 71 ... Through holes for ventilation

Claims (5)

A rotor that can rotate around a predetermined axis;
A stator core that surrounds the rotor from outside in the radial direction;
A stator frame configured to surround the stator core from outside in the radial direction;
In a rotating electrical machine having
The rotor is
An annular member disposed so as to surround the shaft from the outside in the radial direction, and an annular member coaxially rotatable around the shaft;
A plurality of pedestals, each extending in the axial direction, fixed to the outer circumferential surface on the radially outer side of the annular member so as to form a circumferential gap with each other;
A plurality of permanent magnets respectively fixed to the outside in the radial direction of each pedestal;
A plate material having a plate surface facing the outer peripheral surface of the radial gap, and forms a ventilation path that covers the circumferential gap from the outside in the radial direction and penetrates in the axial direction while straddling the pedestal adjacent in the circumferential direction. A plate member for an air passage in which at least one through hole is formed on the plate surface;
Have
The rotating electrical machine, wherein an opening area of the through hole with respect to a surface area of the plate surface is formed so that a downstream side is larger than an upstream side of air flowing through the ventilation path. The plate material for the air passage is in a rectangular shape that is long in the axial direction,
The through-hole is a rectangle that is long in the axial direction formed on the downstream side,
The rotating electrical machine according to claim 1.   The rotating electrical machine according to claim 2, wherein the circumferential width of the through hole is formed so as to gradually increase toward the downstream side.   2. The rotating electrical machine according to claim 1, wherein the ventilation path plate has a rectangular shape that is long in an axial direction, and a plurality of the through holes are formed closer to the downstream side. The plate material for the air passage is in a rectangular shape that is long in the axial direction,
A plurality of the through holes are formed in a circular shape on the plate surface, and the diameter of each through hole is formed so as to gradually increase toward the downstream side;
The rotating electrical machine according to claim 4.

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