JP2013074654A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently cool a stator core of a rotary electric machine or the like.SOLUTION: A rotary electric machine includes: a rotor 20; a stator core 30; and stator frame 40. The stator core 30 has a plurality of steel plate groups 31a through 31d constituted by laminating steel plates. On the steel plates, outside grooves having a plurality of types of groove depths are formed spaced apart from one another at intervals. When the steel plates are laminated in an axial direction, the outside grooves communicate with one another in the axial direction and constitute axial direction ventilation passages. The steel plate groups 31a through 31d include: the steel plate groups having a plurality of axial direction ventilation passages 61a and 61b on which the outside grooves having the groove depths different from one another and communicating with one another in the axial direction are formed; and the steel plate groups having axial direction ventilation passages 61c on which the outside grooves having the same groove depths and communicating with one another in the axial direction are formed.

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.

  A part of the air flowing through this gap flows in the axial direction, and a part flows into a radial flow path formed inside the stator core. Since the flow path cross-sectional area of the radial flow path is larger than the flow path cross-sectional area of the air gap, more air flows in the radial flow path on the upstream side in the axial direction of the air gap.

  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, and a perforated disk-shaped steel plate that penetrates the center while surrounding the rotor from the outside in the radial direction. A plurality of steel plate groups stacked in the direction, a duct plate disposed between the steel plate groups adjacent in the axial direction and formed with a radial ventilation path through which air can flow in the radial direction, and a stator core And a stator frame configured to surround the stator iron core from the outside in the radial direction, wherein each of the steel plates has an outer groove having a plurality of types of groove depths circumferentially outward from each other in the radial direction. A plurality of gaps are formed, and when the steel plates are laminated in the axial direction, the outer groove communicates in the axial direction and constitutes an axial ventilation path through which air can flow from the upstream side to the downstream side, The steel plate group has outer grooves with different groove depths as shafts. A deformed steel plate group in which a plurality of the axial ventilation passages formed in communication with each other and a uniform steel plate in which only a plurality of the axial ventilation passages in which the outer grooves having the same groove depth communicate in the axial direction are formed. The deformed steel plate group is arranged on the upstream side in the axial direction from the homogenous steel plate group.

  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. FIG. 2 is a partial side view of the first steel sheet group in FIG. 1, (a) is a first steel sheet, (b) is a second steel sheet laminated on the first steel sheet, and (c) is two sheets. (D) shows a state in which these three sheets and the fourth and subsequent sheets are viewed from the first sheet side. FIG. 3 is a partial side view of the second steel plate group of FIG. 1, (a) is a first steel plate, (b) is a second steel plate laminated on the first steel plate, and (c) is two pieces. (D) shows a state in which these three sheets and the fourth and subsequent sheets are viewed from the first sheet side. FIG. 4 is a partial side view of the third steel plate group of FIG. 1, (a) is a first steel plate, (b) is a second steel plate laminated on the first steel plate, and (c) is two pieces. (D) shows a state in which these three sheets and the fourth and subsequent sheets are viewed from the first sheet side. It is a partial side view of the 4th steel plate group of FIG. 1 is a table showing the arrangement of the first outer groove (small), the second outer groove (middle), and the third outer groove (large) of the first steel sheet group in FIG. 1, and each vertical column corresponds to an axial ventilation path. Each row arranged horizontally indicates the size (small, medium, large) of the outer groove of each steel plate. 1 is a table showing the arrangement of the first outer groove (small), the second outer groove (middle), and the third outer groove (large) of the second steel plate group in FIG. 1, and each vertical column corresponds to an axial ventilation path. Each row arranged horizontally indicates the size (small, medium, large) of the outer groove of each steel plate. 1 is a table showing the arrangement of the first outer groove (small), the second outer groove (middle), and the third outer groove (large) of the third steel sheet group in FIG. 1, and each vertical column corresponds to an axial ventilation path. Each row arranged horizontally indicates the size (small, medium, large) of the outer groove of each steel plate. 1 is a table showing the arrangement of the first outer groove (small), the second outer groove (middle), and the third outer groove (large) of the fourth steel sheet group in FIG. 1, and each vertical column corresponds to an axial ventilation path. Each row arranged horizontally indicates the size (small, medium, large) of the outer groove of each steel plate. It is a partial side view of the 5th steel plate group of the rotating electrical machine of the 2nd embodiment concerning the present invention, (a) is the 1st steel plate, (b) is the 2nd sheet laminated on the 1st steel plate. (C) is the 3rd steel plate laminated | stacked on the 2nd steel plate, (d) shows the state which looked at the state laminated | stacked 3 sheets from the 1st sheet | seat side. FIG. 10 is a partial side view of the sixth steel plate group of the rotating electrical machine of the embodiment of FIG. 10, (a) is the first steel plate, (b) is the second steel plate laminated on the first steel plate, (C) is the 3rd steel plate laminated | stacked on the 2nd steel plate, (d) shows the state which looked at the state laminated | stacked 3 sheets from the 1st sheet | seat side. FIG. 10 is a partial side view of a seventh steel plate group of the rotating electrical machine of the embodiment of FIG. 10, (a) is a first steel plate, (b) is a second steel plate laminated on the first steel plate, (C) is the 3rd steel plate laminated | stacked on the 2nd steel plate, (d) shows the state which looked at the state laminated | stacked 3 sheets from the 1st sheet | seat side.

  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.

  FIG. 2 is a partial side view of the first steel plate group 31a of FIG. 1, wherein (a) is a first steel plate 33, and (b) is a second steel plate 33 laminated on the first steel plate. (C) is a third steel plate 33 laminated on the second steel plate 33, and (d) is a state in which these three and the fourth and subsequent sheets are laminated as seen from the first sheet side. Show. FIG. 3 is a partial side view of the second steel plate group 31 b of FIG. 1, (a) is the first steel plate 33, and (b) is the second steel plate 33 laminated on the first steel plate 33. (C) is a third steel plate 33 laminated on the second steel plate 33, and (d) is a state in which these three pieces and the fourth and subsequent pieces are laminated as seen from the first piece side. Indicates. 4 is a partial side view of the third steel plate group 31c of FIG. 1, in which (a) is a first steel plate 33, and (b) is a second steel plate 33 laminated on the first steel plate 33. FIG. (C) is a third steel plate 33 laminated on the second steel plate 33, and (d) is a state in which these three pieces and the fourth and subsequent pieces are laminated as seen from the first piece side. Indicates. FIG. 5 is a partial side view of the fourth steel plate group 31d of FIG.

  2 to 4 indicate that the series of outer grooves (a), (b), (c), and (d) are at the same circumferential position. For example, the broken line L1 in FIG. 2 indicates the first outer groove 35a of the first steel plate 33 in FIG. 2A, the third outer groove 35c in the second steel plate 33 in FIG. 2B, and (c). This shows that the third outer groove 35c of the third steel plate 33 and the first axial ventilation path 61a constituted by these outer grooves (d) are at the same circumferential position. In FIG. 5, L2 to L6 are omitted.

  FIG. 6 is a table showing the arrangement of the first outer groove (small) 35a, the second outer groove (middle) 35b, and the third outer groove (large) 35c of the first steel plate group 31a of FIG. Corresponds to the axial ventilation path, and each row arranged horizontally indicates the size (small, medium, large) of the outer grooves 35a, 35b, 35c of each steel plate 33. In addition, the II part in a figure respond | corresponds to the three steel plates 33 of (a), (b), and (c) of FIG.

  FIG. 7 is a table showing the arrangement of the first outer groove (small) 35a, the second outer groove (middle) 35b, and the third outer groove (large) 35c of the second steel plate group 31b of FIG. Corresponds to the axial ventilation path, and each row arranged horizontally indicates the size (small, medium, large) of the outer grooves 35a, 35b, 35c of each steel plate 33. In addition, the III part in a figure respond | corresponds to the three steel plates 33 of (a), (b), and (c) of FIG.

  FIG. 8 is a table showing the arrangement of the first outer groove (small) 35a, the second outer groove (middle) 35b, and the third outer groove (large) 35c of the third steel plate group 31c of FIG. Corresponds to the axial ventilation path, and each row arranged horizontally indicates the size (small, medium, large) of the outer grooves 35a, 35b, 35c of each steel plate 33. In addition, the IV part in a figure respond | corresponds to the three steel plates 33 of (a), (b), and (c) of FIG.

  FIG. 9 is a table showing the arrangement of the first outer groove (small) 35a, the second outer groove (middle) 35b and the third outer groove (large) 35c of the fourth steel plate group 31d in FIG. Corresponds to the axial ventilation path, and each row arranged horizontally indicates the size (small, medium, large) of the outer grooves 35a, 35b, 35c of each steel plate 33. In addition, the V part in a figure respond | corresponds to the laminated steel plate 33 of 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, 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 63).

  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, and a plurality of permanent magnets 23.

  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 on the outer peripheral surface of the annular member 21a. These pedestals 22 are arranged so as to form a circumferential gap therebetween.

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

  Next, the stator core 30 will be described.

  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 have a predetermined radial interval (gap 63) from the outer peripheral surface (radially outer side) of the rotor 20. The air gap 63 is one of axial ventilation paths described later.

  The stator core 30 includes a deformed steel plate group (first steel plate group 31a, second steel plate group 31b, third steel plate group 31c), an isomorphous steel plate group (fourth steel plate group 31d), and a duct plate 38. .

  The 1st steel plate group 31a, the 2nd steel plate group 31b, the 3rd steel plate group 31c, and the 4th steel plate group 31d are arrange | positioned at intervals in the axial direction. A duct plate 38 is disposed at this interval. Details of the configurations of the first steel plate group 31a, the second steel plate group 31b, the third steel plate group 31c, the fourth steel plate group 31d, and the duct plate 38 will be described later.

  The first steel plate group 31a, the second steel plate group 31b, the third steel plate group 31c, and the fourth steel plate group 31d are each formed by laminating a plurality of steel plates 33 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. Further, an inner groove 34 is formed on the inner side in the radial direction of each steel plate 33. Three types of outer grooves, that is, a first outer groove 35a, a second outer groove 35b, and a third outer groove 35c are formed on the outer side (FIGS. 2, 3, 4, and 5).

  A plurality of inner grooves 34 are formed at equal intervals in the circumferential direction. The inner grooves 34 formed in each steel plate 33 are axially arranged when the steel plates 33 are laminated to form the first steel plate group 31a, the second steel plate group 31b, the third steel plate group 31c, and the fourth steel plate group 31d. Communicate. Furthermore, when each steel plate group 31a, 31b, 31c, 31d is arranged in the axial direction, each inner peripheral groove communicates in the axial direction. A stator winding 37 is wound around the inner groove 34 communicated.

  The first outer groove 35a, the second outer groove 35b, and the third outer groove 35c are formed outside the steel plate 33 and have different radial depths.

The first outer groove 35 a is a groove having a predetermined radial depth D ₁ (first depth, indicated by “small” in the drawing). Second outer grooves 35b are deep in the radial direction than the D ₁ second depth D ₂ of the groove (. Indicated by the "medium" in the figure). The third outer groove 35c is deep in the radial direction than the D ₂ third depth D ₃ of the groove (. Indicated by the "large" in the figure). That is, the relation of D ₁ <D ₂ <D ₃ holds for each radial depth.

  The steel plate 33 has three types of outer grooves 35a, 35b, and 35c in one circumferential direction (clockwise in FIG. 2 and the like), a first outer groove 35a, a second outer groove 35b, a third outer groove 35c, The third outer groove 35c, the third outer groove 35c, and the third outer groove 35c are formed in this order. These six outer grooves form a set of outer groove groups 35x (FIGS. 6 to 9). A plurality of outer groove groups 35 x are formed at equal intervals in the circumferential direction of the outer periphery of the steel plate 33. That is, the first outer groove 35a, the second outer groove 35b, and the third outer groove 35c of the steel plate 33 are formed in multiples of six in total.

  Hereinafter, the structure of the 1st steel plate group 31a, the 2nd steel plate group 31b, the 3rd steel plate group 31c, and the 4th steel plate group 31d is demonstrated. First, the first steel plate group 31a will be described.

  The first steel plate group 31a is configured by laminating the steel plates 33 in the axial direction while satisfying the relationship described below. At this time, a first axial ventilation path 61a is formed in the first steel sheet group 31a. Details of the first axial ventilation path 61a will be described later.

  Here, the case where the steel plates 33 are stacked in one axial direction, that is, from the right side to the left side in FIG. 1 (hereinafter referred to as the first axial direction) will be described.

  When the second steel plate 33 (FIG. 2B) is laminated in the first axial direction on the first steel plate 33 (FIG. 2A), the first outer groove 35a of the second steel plate 33 is stacked. (A2 in FIG. 2) is arranged along a broken line L2 in FIG. 2 so that the circumferential position of (A2 in FIG. 2) is aligned with the circumferential position of the first second outer groove 35b (B1 in FIG. 2). Thus, the 2nd steel plate 33 is laminated | stacked. Similarly, when the third steel plate 33 (FIG. 2C) is laminated on the second steel plate 33 in the first axial direction, the circumferential position of the first outer groove 35 a of the third steel plate 33. However, the 3rd steel plate 33 is laminated | stacked so that it may align with the circumferential direction position (broken line L3) of the 2nd 2nd outer side groove | channel 35b. By repeating this, a plurality of steel plates 33 are laminated in the first axial direction (FIG. 6).

  That is, in the first steel plate group 31a, the n-th steel plate 33 laminated in the first axial direction has a circumferential position of the first outer groove 35a with respect to the (n-1) -th steel plate 33. The layers are laminated by being shifted by one groove (one pitch) in the circumferential direction (for example, clockwise in FIG. 2).

  Each outer groove 35a, 35b, 35c formed in the steel plate 33 communicates in the axial direction when the steel plate 33 is laminated to form the first steel plate group 31a. The outer groove communicated in the axial direction forms a cooling air flow path (axial ventilation path).

All the axial ventilation paths formed in the first steel plate group 31a are the first axial ventilation paths 61a. The first axial air passage 61a is flowpath surface of the first depth D ₁ is formed in at least one place in a predetermined position in the axial position.

  When viewed from the outside in the axial direction, the first steel plate group 31a always includes the first outer groove 35a in the outer groove at any circumferential position (FIG. 2 (d)).

  Next, the second steel plate group 31b will be described.

  The second steel plate group 31b is laminated in the axial direction while the steel plate 33 satisfies the relationship described below. At this time, the 1st axial direction ventilation path 61a and the 2nd axial direction ventilation path 61b are formed in the 2nd steel plate group 31b.

  Below, the case where the steel plate 33 is laminated | stacked on a 1st axial direction (FIG. 6) is demonstrated similarly to the 1st steel plate group 31a.

  When the second steel plate 33 (FIG. 3B) is stacked in the first axial direction on the first steel plate 33 (FIG. 3A), the first outer groove 35a of the second steel plate 33 is stacked. 3 so that the circumferential position of (A2 in FIG. 3) is aligned with the circumferential position of the third outer groove 35c (C1 in FIG. 3) adjacent to the first second outer groove 35b. A second steel plate 33 is laminated so as to be arranged along the broken line L3. Similarly, when the third steel plate 33 (FIG. 3C) is laminated on the second steel plate 33 in the first axial direction, the circumferential position of the first outer groove 35 a of the third steel plate 33. The third steel plate 33 is laminated so that (broken line L5) is aligned with the circumferential position of the third outer groove 35c adjacent to the second second outer groove 35b.

  That is, in the second steel plate group 31b, the n-th steel plate 33 laminated in the first axial direction is positioned in the circumferential direction of the first outer groove 35a with respect to the (n-1) th steel plate 33 as shown in FIG. Are stacked by shifting by two grooves (two pitches) clockwise (FIG. 7).

The axial ventilation path formed in the second steel plate group 31b is a first axial ventilation path 61a and a second axial ventilation path 61b. The first axial air passage 61a is flowpath surface of the first depth D ₁ is formed in at least one place in a predetermined position in the axial position. The second axial air passage 61b is the flow path surface of the second depth D ₂ is formed on at least one place in a predetermined position in the axial position, and the flow path surface of the first depth D ₁ is not formed.

  In the second steel plate group 31b, when viewed from the outside in the axial direction, the smallest groove depth of the outer groove at any circumferential position is the case of the first outer groove 35a and the case of the second outer groove 35b. Evenly exists. In the second steel plate group 31b, the first axial ventilation path 61a and the second axial ventilation path 61b are evenly arranged (FIG. 3D).

  For example, when the outer groove group 35x has four sets, the total number of outer grooves is 24. In this case, 24 axial ventilation paths are formed in the second steel plate group 31b.

  Of these, twelve of them form a first axial ventilation path 61a, and the remaining twelve form a second axial ventilation path 61b.

That is, the axial air passage of the second steel plate group 31b, the first axial air passage 61a which contains a flow path surface of the first depth D _1, and the first depth D includes a flow road second depth D ₂ Two types of the second axial ventilation path 61b not including _one flow path surface are formed uniformly.

  Next, the 3rd steel plate group 31c is demonstrated.

  The third steel plate group 31c is configured by laminating the steel plates 33 in the axial direction while satisfying the relationship described below. At this time, a first axial ventilation path 61a, a second axial ventilation path 61b, and a third axial ventilation path 61c are formed in the third steel sheet group 31c.

  The case where the steel plate 33 is laminated | stacked on the 1st axial direction similarly to the 1st steel plate group 31a is demonstrated.

  When the second steel plate 33 (FIG. 4B) is laminated in the first axial direction on the first steel plate 33 (FIG. 4A), the first outer groove 35a of the second steel plate 33 is stacked. The circumferential position of (A2 in FIG. 4) is aligned with the circumferential position of the third outer groove 35c (C1 in FIG. 4) of the second groove, counting from the second outer groove 35b of the first sheet. A second steel plate 33 is laminated so as to be arranged along the broken line L4 in FIG. Similarly, when the third steel plate 33 (FIG. 4C) is laminated on the second steel plate 33 in the first axial direction, the circumferential position of the first outer groove 35 a of the third steel plate 33. However, the third steel plate 33 is laminated so as to be aligned with the circumferential position of the second outer groove 35c of the second groove, counting from the second outer groove 35b of the second sheet.

  That is, in the third steel plate group 31c, the n-th steel plate 33 laminated in the first axial direction has the circumferential position of the first outer groove 35a clockwise relative to the (n-1) th steel plate 33. Are stacked by being shifted by three grooves (three pitches) (FIG. 8).

The axial ventilation paths formed in the third steel plate group 31c are a first axial ventilation path 61a, a second axial ventilation path 61b, and a third axial ventilation path 61c. Third axial air passage 61c is flowpath surface is first depth D ₃ in all axial positions are formed.

  When viewed from the outside in the axial direction, the third steel sheet group 31c includes any one of the first outer groove 35a, the second outer groove 35b, and the third outer groove 35c in the outer groove at any circumferential position. And these are arrange | positioned equally (FIG. 8).

  For example, when the outer groove group 35x has four sets, the total number of outer grooves is 24. In this case, 24 axial ventilation paths are formed in the third steel plate group 31c.

  Of these, eight are the first axial ventilation paths 61a, the other eight are the second axial ventilation paths 61b, and the remaining eight are the third axial ventilation paths 61c. Further, in this example, the first axial ventilation path 61a, the second axial ventilation path 61b, and the third axial ventilation path 61c are formed to repeat in this order in the circumferential direction (clockwise) in FIG.

  Next, the fourth steel plate group 31d will be described.

  The fourth steel plate group 31d is configured such that the axial positions of the first outer grooves 35a of all the steel plates 33 to be laminated are aligned (FIGS. 5 and 9).

  When viewed from the outside in the axial direction, the fourth steel sheet group 31d includes any one of the first outer groove 35a, the second outer groove 35b, and the third outer groove 35c in the outer groove at any circumferential position. However, unlike the third steel plate group 31c, the fourth steel plate group 31d is not evenly arranged in the first outer groove 35a, the second outer groove 35b, and the third outer groove 35c (FIG. 5).

  For example, when the outer groove group 35x has four sets, the total number of outer grooves is 24. In this case, 24 axial ventilation paths are formed in the fourth steel sheet group 31d.

  Four of these are the first axial ventilation passages 61a in which the flow path surfaces of all axial positions are formed by the first outer grooves 35a, and the other four are flow paths of all the axial positions. A third axial ventilation path 61c in which the road surface is a second axial groove 61b formed by the second outer groove 35b and the remaining sixteen flow paths at all axial positions are formed by the third outer groove 35c. It becomes.

  Here, the flow area and flow resistance of the axial direction ventilation path of the 1st steel plate group 31a, the 2nd steel plate group 31b, the 3rd steel plate group 31c, and the 4th steel plate group 31d are demonstrated.

  The flow resistance when air flows in the axial ventilation path depends on the smallest flow path area among the flow path areas at the axial positions of one axial ventilation path.

  All axial direction ventilation paths (first axial direction ventilation path 61a, second axial direction ventilation path 61b, third axis) of the first steel sheet group 31a, the second steel sheet group 31b, the third steel sheet group 31c, and the fourth steel sheet group 31d The direction ventilation path 61c) is formed by including any of the first outer groove 35a, the second outer groove 35b, and the third outer groove 35c. Here, the circumferential widths of the first outer groove 35a, the second outer groove 35b, and the third outer groove 35c are all formed to be the same.

The flow area formed by each of the first outer groove 35a, the second outer groove 35b, and the third outer groove 35c is a radial depth, that is, a first depth D ₁ , a second depth D ₂ , and a third depth. It is dependent on the _{D 3.} When simplified, the channel area is proportional to each depth. Therefore, hereinafter, the flow resistance when air flows in the axial ventilation path will be described on the assumption that the flow path area depends on the depths D ₁ , D ₂ , and D ₃ .

Hereinafter, the ratio of the first depth D ₁ , the second depth D ₂ , and the third depth D ₃ is 1: 2: 3, and the area ratio corresponding to each depth is obtained. In this example, assuming that the width of each outer groove is the same and the cross-sectional shape of the flow path is substantially rectangular, the area (S) corresponding to the first depth D ₁ , the second depth D ₂ , and the third depth D _{3. 1} , S ₂ , S ₃ ) is 1: 2: 3. In this case, S ₂ = 2S ₁ and S ₃ = 3S ₁ .

  For simplicity, one set of outer groove groups 35x among a plurality of outer grooves formed in one steel plate 33 will be described.

The first steel sheet group 31a is flowpath surface of the first depth D ₁ is formed on all the six outer groove. Therefore, the flow path area can be 6 times S1, that is, “6S ₁ ”.

Similarly, the second steel plate group 31b, since the three first depth D ₁ of the flow path surface, and the three flow path surface of the second depth D ₂ is formed, and three times S _1, S The sum of ₂ and 3 times, that is, 3S ₁ + 3S ₂ = 3S ₁ +3 (2S ₁ ), and the channel area can be represented by “9S ₁ ”.

Third steel group 31c includes two first depth D ₁ of the flow path surface, two second depth D ₂ of the passage surface, and two third the depth D ₃ of the flow path surface is formed Therefore, twice and _{S 1,} twice and _{S 2,} the sum of twice the _{S 3,} i.e., the flow channel area can be expressed by "12S _1".

Fourth steel group 31d has one of the first depth D ₁ of the flow path surface, one second depth D ₂ of the passage surface, and four third depth D ₃ of the flow path surface is formed Therefore, the sum of 1 times S ₁ , 1 time S ₂ , and 4 times S ₃ , that is, the channel area can be represented by “15S ₁ ”.

  That is, the approximate ratio of the flow area of the axial ventilation path of the first steel plate group 31a, the second steel plate group 31b, the third steel plate group 31c, and the fourth steel plate group 31d is taken as 6: 9: 12: 15. Can do. As a result, the flow resistance in the axial ventilation path of the first steel plate group 31a, the second steel plate group 31b, the third steel plate group 31c, and the fourth steel plate group 31d decreases in this order.

  The stator core 30 of this embodiment has six steel plate groups. In the stator core 30 of this example, each steel plate group is in order from the upstream side (the right side of FIG. 1) of the axial flow of air, in order from the first steel plate group 31a, the first steel plate group 31a, the second steel plate group 31b, Arranged in the axial direction so as to be a second steel plate group 31b, a third steel plate group 31c, and a fourth steel plate group 31d, the duct plates 38 are arranged without gaps between the respective steel plate groups.

  As described above, the duct plate 38 is disposed between the respective steel plate groups 31a, 31b, 31c, and 31d arranged in the axial direction. That is, the steel plate groups 31a, 31b, 31c, 31d and the duct plate 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 inner surface of the stator frame 40 closes the opening on the radially outer side of the axial ventilation path described above.

  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.

  The stator frame 40 is formed with an exhaust port (not shown) through which air circulated through the air taken into the stator frame 40 is exhausted.

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

  Most of the air sucked into the stator frame 40 flows into any of the various axial ventilation passages 61 a, 61 b, 61 c and the gap 63 formed in the stator core 30. Thereafter, a part of the air that has flowed into the gap 63 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 into the axial ventilation path flows in the axial direction toward the left side of FIG. A part of the air flowing into the gap 63 flows in the axial direction, and a 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 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 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 to the outside of the stator frame 40.

  When the flow path of the gap 63 is regarded as one annular flow path, a plurality of radial ventilation paths 62 are formed radially on one duct plate 38, and therefore the flow area is larger in the radial ventilation path. , Larger than the gap 63.

  Since a plurality of radial ventilation paths 62 are formed, the amount of air flowing in the gap 63 decreases in the axial direction and hardly flows downstream. In this state, in the vicinity of the downstream side of the gap 63, the cooling effect on the inner peripheral side of the stator core 30 is lower than that on the upstream side.

  In the present embodiment, the first steel plate group 31a is arranged on the upstream side. The ventilation path (first axial ventilation path 61a) formed in the first steel sheet group 31a is a ventilation path (first axial ventilation) formed in a steel sheet group disposed on the downstream side, for example, the fourth steel sheet group 31d. The flow resistance is larger than those of the path 61a, the second axial ventilation path 61b, and the third axial ventilation path 61c).

  The air flowing through the gap 63 is directed to the first axial ventilation path 61a of the first steel sheet group 31a via the radial flow path 62 rather than, for example, the third axial ventilation path 61c of the fourth steel sheet group 31d on the downstream side. Difficult to flow. As a result, the amount of air that can enter the radial direction air passage 62 is suppressed to some extent upstream from the downstream side in the axial direction.

  Air that cannot flow into the radial flow path 62 flows through the gap 63. As a result, air also flows downstream of the gap 63.

  Since each steel plate group 31a, 31b, 31c, 31d is arranged as described above, the flow resistance of the axial ventilation path of the stator core 30 is higher on the upstream side than on the downstream side. Therefore, the amount of air that is about to flow into the radial ventilation path 62 at a predetermined axial position of the gap 63 is adjusted so as to increase from upstream to downstream.

  As a result, it is possible to suppress variation in the amount of air flowing through the axial ventilation path and the gap 63 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. In addition, the channel area of the axial ventilation path can be adjusted without adding a new member.

[Second Embodiment]
A second embodiment will be described with reference to FIGS. In addition, the whole structure of the rotary electric machine of this embodiment is the same as FIG. 1 demonstrated in 1st Embodiment.

  FIG. 10 is a partial side view of the fifth steel plate group 31e of the rotating electrical machine of the present embodiment, where (a) is the first steel plate 33, and (b) is the second laminated on the first steel plate. (C) is the 3rd steel plate 33 laminated | stacked on the 2nd steel plate, (d) shows the state which looked at the state laminated | stacked 3 sheets from the 1st sheet | seat side.

  FIG. 11 is a partial side view of the sixth steel plate group 31 f of the rotating electrical machine of the present embodiment, where (a) is a first steel plate 33, and (b) is two stacked on the first steel plate 33. In the steel plate 33 of the eye, (c) is a third steel plate 33 laminated on the second steel plate 33, and (d) shows a state where the three laminated plates are viewed from the first sheet side.

  FIG. 12 is a partial side view of the seventh steel plate group 31g of the rotating electrical machine of the present embodiment, where (a) is a first steel plate 33, and (b) is two sheets stacked on the first steel plate 33. In the steel plate 33 of the eye, (c) is a third steel plate 33 laminated on the second steel plate 33, and (d) shows a state where the three laminated plates are viewed from the first sheet side.

  In addition, this embodiment is a modification of 1st Embodiment (FIGS. 1-9), 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 steel plate 33 of the present embodiment has two types of outer grooves having different radial depths, and the first outer groove 35a and the third outer groove 35c described in the first embodiment are formed.

  Each steel plate 33 is formed in the order of the first outer groove 35a, the third outer groove 35c, and the third outer groove 35c with a circumferential interval therebetween in the clockwise direction of FIG. In this example, a set of outer grooves is formed by these three outer grooves. A plurality of outer groove groups are formed at equal intervals in the circumferential direction of the outer periphery of the steel plate 33. That is, the outer grooves of the steel plate 33 are formed in multiples of three in total.

  The steel plate group of this embodiment includes three steel plate groups different from the four first steel plate groups 31a described in the first embodiment, a fifth steel plate group 31e, a sixth steel plate group 31f, and a seventh steel plate group 31g. Have

  When the second steel plate 33 (FIG. 10B) is laminated on the first steel plate 33 (FIG. 10A), the fifth steel plate group 31e has a second first outer groove 35a. The circumferential position of (A2 in FIG. 10) is aligned with the third outer groove 35c (C1 in FIG. 10) adjacent to the first first outer groove 35a (A1 in FIG. 10) in the clockwise direction. In other words, the layers are stacked along the broken line L2 in FIG.

  When this is repeated and the third and subsequent steel plates 33 (FIG. 10 (c)) are stacked, the fifth steel plate group 31e has all the axial ventilation paths as shown in FIG. 10 (d). It becomes the 1st axial direction ventilation path 61a.

  When the second steel plate 33 (FIG. 11B) is stacked on the first steel plate 33 (FIG. 11A), the sixth steel plate group 31f has a second first outer groove 35a. The circumferential position of (A2 in FIG. 11) is the third outer groove 35c (in FIG. 11) at the position moved by two grooves in the clockwise direction of the first first outer groove 35a (A1 in FIG. 11). Are aligned so as to be aligned with C1), that is, along the broken line L3 in FIG.

  When this is repeated and the third steel plate 33 (FIG. 11 (c)) and subsequent layers are stacked, the sixth steel plate group 31f is, as shown in FIG. 11 (d), of all the axial ventilation paths. Two thirds of these are the first axial ventilation path 61a, and the remaining are the third axial ventilation path 61c.

  When the second steel plate 33 (FIG. 12B) is stacked on the first steel plate 33 (FIG. 12A), the seventh steel plate group 31g has a second first outer groove 35a. (A2 in FIG. 12) is laminated so that the circumferential position of the first outer groove 35a (A1 in FIG. 12) of the first sheet is aligned in the clockwise direction. That is, the seventh steel plate group 31g is laminated so that the outer grooves having the same groove depth communicate with each other in the axial direction. As a result, as shown in FIG. 12 (d), one third of all the axial ventilation paths are the first axial ventilation paths 61a, and the remaining are the third axial ventilation paths 61c.

  In this example, the flow resistance when air flows through the ventilation path in the order of the fifth steel plate group 31e, the sixth steel plate group 31f, and the seventh steel plate group 31g decreases.

  In the stator core 30 of the present embodiment, the fifth steel plate group 31e is arranged upstream, the sixth steel plate group 31f is arranged downstream thereof, and the seventh steel plate group 31g is arranged further downstream.

  Thereby, the stator core 30 can be comprised with the steel plate 33 simpler than 1st Embodiment. Although the type of the flow path area of the ventilation path is smaller than that of the first embodiment, it is applicable to a small rotating electric machine or the like.

[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, in the first embodiment, the first steel plate group 31a, the second steel plate group 31b, the third steel plate group 31c, and the fourth steel plate group 31d are all used, but the present invention is not limited to this. If two types are used, the same effect as the first embodiment can be obtained.

  Moreover, although the steel plate group of the said embodiment is comprised by shifting each steel plate 33 clockwise one by one, it is not restricted to this. For example, one set of three sheets may be shifted clockwise by three sheets.

  Moreover, in this embodiment, although the steel plate 33 is an annular member, it is not restricted to this. You may combine the thing of a partial annular shape (divided core) which divided | segmented the annular ring into plurality.

  Moreover, in the said embodiment, although the shaft member 10 is rotatably supported by the bearing, it is not restricted to this. For example, the shaft member 10 may be fixed, a bearing may be attached to the shaft member 10, and the support member 21b may be fixed to the outer periphery of the bearing. In this case, an air inlet may be provided at the center of the shaft member 10 and a ventilation port may be provided on the outer peripheral surface of the shaft member 10.

DESCRIPTION OF SYMBOLS 1 ... Rotation center shaft 10 ... Shaft member 20 ... Rotor 21a ... Ring member 21b ... Support member 22 ... Base 23 ... Permanent magnet 30 ... Stator iron core 31a ... 1st steel plate group 31b ... 2nd steel plate group 31c ... 3rd Steel plate group 31d ... Fourth steel plate group 31e ... Fifth steel plate group 31f ... Sixth steel plate group 31g ... Seventh steel plate group 33 ... Steel plate 34 ... Inner groove 35a ... First outer groove 35b ... Second outer groove 35c ... Third outer Side groove 37 ... Stator winding 38 ... Duct plate 40 ... Stator frame 61a ... First axial ventilation path 61b ... Second axial ventilation path 61c ... Third axial ventilation path 62 ... Radial ventilation path 63 ... Gap

Claims (2)

A rotor that can rotate around a predetermined axis;
A perforated disk-shaped steel plate penetrating the center is disposed between a plurality of steel plate groups laminated in the axial direction while surrounding the rotor from the outside in the radial direction, and the radius 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 a direction, and a stator core provided with the duct plate,
A stator frame configured to surround the stator core from outside in the radial direction;
In a rotating electrical machine having
Each of the steel plates is
A plurality of types of outer grooves with different groove depths are formed radially outwardly at circumferential intervals, and when the steel plates are laminated in the axial direction, the outer grooves communicate with each other in the axial direction and air flows upstream. An axial ventilation path that can flow from the side to the downstream side is constructed,
The steel sheet group is
A deformed steel plate group in which a plurality of the axial ventilation passages formed by communicating outer grooves with different groove depths in the axial direction; and
A group of isomorphous steel plates in which a plurality of the axial ventilation passages formed by communicating the outer grooves with the same groove depth in the axial direction are formed,
Including
The rotating electrical machine, wherein the deformed steel plate group is arranged on the upstream side in the axial direction from the homogenous steel plate group. Each of the steel plates is
A plurality of outer grooves each having a predetermined groove depth in the radial direction are formed radially outwardly at circumferential intervals, and the outer grooves communicate with each other in the axial direction when the steel plates are laminated in the axial direction. Constitutes an axial ventilation path that can circulate from the upstream side to the downstream side,
The plurality of outer grooves include a first outer groove having a first groove depth, a second outer groove having a second depth deeper in the radial direction than the first depth, and a depth greater than the second depth. A third outer groove of a third depth deep in the radial direction,
These outer grooves are arranged in the order of the first outer groove, the second outer groove, the third outer groove, the third outer groove, the third outer groove, and the third outer groove in one circumferential direction. These 6 pieces form a set of outer groove groups, and a plurality of sets of the outer groove groups are formed.
The deformed steel plate group is
The first outer groove of the steel plate laminated in one axial direction with respect to the first outer groove of the predetermined steel plate is laminated in a state in which it moves in the one circumferential direction by one groove, A first steel plate group in which the steel plates are laminated in the one axial direction so as to repeat these,
The first outer groove of the steel plate laminated in the one axial direction with respect to the first outer groove of the predetermined steel plate is laminated in a state where the two outer grooves move in the one circumferential direction. The second steel plate group in which the steel plates are laminated in the one axial direction so as to repeat these,
The first outer groove of the steel plate laminated in the one axial direction with respect to the first outer groove of the predetermined steel plate is laminated in a state of moving in the one circumferential direction by three grooves. The third steel sheet group in which the steel sheets are laminated in the one axial direction so as to repeat these,
Including
The first steel sheet group is disposed on the upstream side, the second steel sheet group is disposed on the downstream side of the first steel sheet group, and the third steel sheet group is disposed on the downstream side of the second steel sheet group. Arranged, the same-shaped steel plate group is arranged downstream of the third steel plate group,
The rotating electrical machine according to claim 1.

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