JP5647961B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine having a stator core in which a ventilation path is formed.

  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.

  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 has an annular shape surrounding a rotating shaft from the outside in the radial direction, and at least two bearings are fixed at an axial interval so as to surround the outer periphery. A shaft member in which at least one through hole is formed on the outer peripheral surface between and an annular shape surrounding the shaft member from the outside in the radial direction, a through hole is formed on the outer side in the axial direction, and a pedestal is formed on the outer peripheral surface A magnetic member is attached to the outer side in the radial direction of the pedestal, the rotor is supported by a bearing and is rotatable around the rotation shaft, the stator core surrounding the rotor from the outer side in the radial direction, and the fixed And a stator frame configured to surround the core from the outside in the radial direction. The stator core is formed by stacking perforated disk-shaped steel plates each penetrating the center. An axial ventilation path through which air can flow is formed, and a plurality of steel plate groups arranged in the axial direction with an axial interval between them, and arranged between the steel plate groups adjacent in the axial direction, A duct plate formed with a radial ventilation path through which air can flow in the radial direction, and a plurality of duct plates are arranged in the axial ventilation path with an axial interval therebetween, each of which is an axial ventilation path A plurality of flow resistors formed so that the axial sectional area can be adjusted and the channel sectional area of the axial ventilation passage gradually decreases toward the upstream side in the axial direction are arranged. And

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

It is a schematic partial front view of the rotary electric machine of 1st Embodiment which concerns on this invention, and shows an upper half with respect to a rotation center. It is the II-II arrow side view of FIG. It is a III-III arrow side view of FIG. It is a side view of the stator core of the rotary electric machine of 2nd Embodiment which concerns on this invention. It is a side view which shows the example which has arrange | positioned the flow resistance body to the stator core of FIG. It is a schematic partial front view of the rotary electric machine of 3rd Embodiment which concerns on this invention, and shows an upper half with respect to a rotation center. It is a VII-VII arrow side view of FIG. It is a VIII-VIII arrow side view of FIG.

  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 front view of the rotating electrical machine of the present embodiment, showing the upper half of the center of rotation. 2 is a side view taken along the line II-II in FIG. 3 is a side view taken along the line III-III in FIG.

  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, a stator frame 40 that accommodates these, and two bearings. 11 and the flow resistor 70.

  The shaft member 10 is an annular member that surrounds the rotation center shaft 1 from the outside in the radial direction. Bearings 11 are attached to the shaft member 10 at intervals in the axial direction. These bearings 11 are attached to the shaft member 10 so as to surround the outer periphery of the shaft member 10.

  A ventilation hole 12 is formed in the outer peripheral surface of the shaft member 10 between the two bearings 11. The ventilation hole 12 serves as a flow path of air from the rotation center to the outside in the radial direction.

  Moreover, the edge part of the shaft member 10 is opened, and this opening turns into an inlet port (not shown). That is, the air taken in from the end portion of the shaft member 10 passes through the ventilation hole 12 and enters the rotary electric machine.

  These bearings 11 are configured such that the side in contact with the shaft member 10 is fixed and the radially outer side (outer peripheral surface) rotates.

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

  The support member 21 b is fixed to the bearing 11 and is rotatable together with the outer peripheral surface of the bearing 11. The support member 21b extends radially from the bearing 11 to the inner peripheral surface of the annular member 21a, and supports 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 attached to the outer peripheral surface of the annular member 21a at intervals in the circumferential direction. Each pedestal 22 is a plate-like member in which a long rectangle is formed in the axial direction. The permanent magnet 23 is attached to the outer side in the radial direction of each pedestal 22 by adhesion.

  The stator core 30 is configured to surround the rotor 20 from the outside in the radial direction, and is an annular 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. 2).

  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 41 that are long in the axial direction are attached to the outer peripheral surface of the stator frame 40. These fins 41 are attached at intervals in the circumferential direction.

  The stator frame 40 fixes the shaft member 10. Further, an exhaust port 42 is formed through which the air taken into the stator frame 40 and circulated is exhausted.

  A plurality of flow resistors 70 are arranged in the axial ventilation path 61 in the stator core 30 with an axial interval therebetween. By disposing the flow resistor 70, the flow area of the axial ventilation path 61 is reduced. This increases the flow resistance of the cooling air.

  The flow resistor 70 is fitted to the circumferential width of the axial ventilation path 61 (FIG. 3).

  Each flow resistor 70 includes a plurality of flat plates 71, and these flat plates 71 are laminated. Each plate is fitted to the circumferential width of the axial ventilation path 61. By adjusting the number of the flat plates 71 to be laminated, the axial sectional area of the axial ventilation path 61 can be adjusted.

  The flow resistor 70 reduces the number of stacked flat plates 71 from the upstream side toward the downstream side. That is, the channel cross-sectional area of the upstream axial ventilation passage 61 is smaller than the channel cross-sectional area of the downstream side.

  Next, the operation of the present embodiment will be described by comparing the case with and without the flow resistor 70. First, a case where there is no flow resistor 70 will be described.

  The air sucked from the intake port flows into the axial ventilation path 61 and the gap 61a formed in the stator core 30.

  Thereafter, a part of the air flowing into the gap 61 a flows in the axial direction, and a part flows in 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 41 and 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 42 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. That is, less air flows downstream of the gap 61a. For this reason, 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.

  Next, the case where the flow resistor 70 is attached will be described.

  The air sucked from the intake port of the stator frame 40 flows into the axial ventilation path 61 and the gap 61 a formed in the stator core 30. Thereafter, a part of the air flowing into the gap 61 a flows in the axial direction, and a part flows in the radial ventilation path 62 of the duct plate 38. The flow of cooling air up to this point is almost the same as when the flow resistor 70 is not provided.

  As described above, since a plurality of the radial direction air passages 62 are formed, it tends to flow into the radial direction air passage 62 on the upstream side in the axial direction. The air that has flowed out of the radial ventilation path 62 is less likely to flow through the axial ventilation path 61 by the flow resistor 70 disposed in the axial flow path. For this reason, the amount of air that can enter the radial ventilation path 62 is suppressed to some extent.

  Air that cannot flow into the radial flow path flows through the gap 61a. As a result, air also flows downstream of the gap 61a. As a result, it is possible to prevent the amount of air flowing through the axial ventilation path 61 and the gap 61a from varying depending on the position in the axial direction.

  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. 4 is a side view of the stator core 30 of the rotating electrical machine according to the present embodiment. FIG. 5 is a side view showing an example in which the flow resistor 70 is arranged in the stator core 30 of FIG.

  In addition, this embodiment is a modification of 1st Embodiment (FIGS. 1-3), 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.

  The overall configuration of the rotating electrical machine of this embodiment is the same as that of FIG. 1 described in the first embodiment.

  In the steel plate 33 constituting the steel plate group 31 of the stator core 30 of the present embodiment, a plurality of ventilation passage through holes 50 are formed at intervals in the circumferential direction.

  A plurality of air passage through holes 50 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 flow resistor 70 is configured by laminating plate materials in the radial direction, as in the first embodiment.

  Thereby, it is possible to obtain the same effect as that of the first embodiment.

[Third Embodiment]
A third embodiment will be described with reference to FIGS. FIG. 6 is a schematic partial front view of the rotating electrical machine of the present embodiment, showing the upper half of the center of rotation. 7 is a side view taken along arrow VII-VII in FIG. FIG. 8 is a side view taken along arrow VIII-VIII in FIG. 6.

  The stator core 30 of this embodiment has six types of steel plates 33. The same type of steel plate 33 constitutes one steel plate group 31. These steel plates 33 have different radial depths of the outer grooves 35 (FIGS. 2 and 3) described in the first embodiment.

  The radial depth D of the outer groove 35 of the steel plate 33 (FIG. 7) constituting the steel plate group 31 arranged on the rightmost side of FIG. 6 is the steel plate 33 constituting the steel plate group 31 arranged on the leftmost side of FIG. It is smaller than the depth D in the radial direction of the outer groove 35 in FIG.

  In this example, the radial depth of the outer grooves 35 of the steel plates 33 constituting the steel plate group 31 arranged from the right side to the left side in FIG. 6 is configured to gradually increase from the right side to the left side. Yes. The steel plate 33 of the steel plate group 31 on the leftmost side may have the same shape as the steel plate shown in FIG. 2 described in the first embodiment.

  As a result, the flow passage cross-sectional area of the axial ventilation passage 61 gradually increases from upstream to downstream in the flow direction of the cooling air. That is, the flow resistor 70 of the present embodiment is formed integrally with the steel plate 33.

  Thereby, the effect similar to 1st Embodiment can be acquired. In addition, since the flow resistor 70 is a part of the steel plate 33, vibration or the like generated by the flow resistor 70 alone during operation of the rotating electrical machine can be suppressed.

[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.

  For example, the features of the second embodiment and the features of the third embodiment may be combined. In this case, you may comprise so that the hole diameter of the through-hole 50 for ventilation paths of 2nd Embodiment may differ for every steel plate group 31. FIG.

  Moreover, although the flow resistance body 70 of the said embodiment has laminated | stacked the flat plate 71 in the radial direction, it is not restricted to this. For example, a plate material may be attached to a flat portion facing the axial direction of the duct plate 38 so as to be in parallel with the steel plate 33 so as to block a part of the flow path surface of the axial ventilation path 61. In this case, the plate material may be attached to the duct plate 38 by welding or the like.

DESCRIPTION OF SYMBOLS 1 ... Center axis of rotation 10 ... Shaft member 11 ... Bearing 12 ... Slot for ventilation 20 ... Rotor 21a ... Ring member 21b ... Support member 22 ... Base 23 ... Permanent magnet 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 41 ... Fin 42 ... Exhaust port 50 ... Ventilation passage through hole 61 ... Axial ventilation passage 61a ... Air gap 62 ... Radial direction Ventilation path 70 ... Flow resistance 71 ... Flat plate

Claims (4)

At least two bearings are fixed at an axial interval so as to surround the outer periphery so as to surround the outer periphery, and at least one through hole is formed in the outer peripheral surface between the bearings. A shaft member;
An annular shape surrounding the shaft member from the outside in the radial direction, a through hole is formed on the outside in the axial direction, a pedestal is formed on the outer peripheral surface, and a magnetic member is attached to the outside of the pedestal in the radial direction and supported by the bearing. A rotor that is rotatable around the rotation 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 stator core is
A plurality of axially ventilated passages that are formed by laminating perforated disk-shaped steel plates penetrating through the center so that air can flow in the axial direction, and are spaced apart from each other in the axial direction. Steel sheet group,
A duct plate disposed between the steel plate groups adjacent to each other in the axial direction and formed with a radial ventilation path through which air can flow in the radial direction;
Have
A plurality of axially spaced airflow passages are arranged in the axial airflow passage, each of which can adjust the axial cross-sectional area of the axial airflow passage, and the axial cross-sectional area of the axial airflow passage is upstream in the axial direction. A plurality of flow resistors formed so as to gradually become smaller toward
Rotating electric machine.   2. The rotating electrical machine according to claim 1, wherein the flow resistor is configured to adjust a flow passage area of a ventilation path by laminating metal plate members in a radial direction.   The axial ventilation passage is formed with grooves formed on the radially outer side of the perforated disks, and the grooves communicate with each other in the axial direction when the perforated disks are stacked in the axial direction. The rotating electrical machine according to claim 1, wherein the rotating electrical machine is formed by:   The axial direction ventilation path is configured so that a through hole is formed in a plane of each of the perforated discs, and the through hole communicates in the axial direction. Item 3. The rotating electrical machine according to Item 2.

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