JP2013158177A - Stator of rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator of a rotary electric machine which includes coil plate laminated bodies achieving good radiation performance.SOLUTION: A stator 1 includes: a stator core 2 where slots 5 extending in a rotary axial direction Z of a three-phase AC motor are formed; and coil plate laminated bodies 10, each of which is inserted into the slot 5 in a state where a protruding part 16 protruding from the stator core 2 appears, the coil plate laminated body 10 where multiple coil plates 15 are laminated in a rotation radius direction R. The protruding part 16 of each coil plate laminated body 10 is formed so that a height at the inner side in the rotation radius direction R becomes lower than a height of an intermediate part 21.

Description

  The present invention relates to a stator applied to a rotating electrical machine.

  As a stator of a rotating electrical machine, a coil plate projecting from the stator core in the direction of the rotation axis and a coil plate having a low height alternately stacked in the radial direction of the rotation are formed into a fin shape. The thing provided with the coil plate laminated body which was made is known (patent document 1). In addition, there is Patent Document 2 as a prior art document related to the present invention.

Japanese Patent No. 4631340 JP 2007-336650 A

  In general, the coil plate laminate is more likely to have heat in the middle than the inside and outside of the rotating electrical machine in the rotational radius direction. Since the stator of Patent Document 1 has a constant average height in the rotational radius direction of each coil plate, the heat dissipation at the intermediate portion of the coil plate laminate is inferior to the inside in the rotational radius direction and the outside in the rotational radius direction.

  Moreover, the stator of patent document 1 comprises a coil plate laminated body so that a low coil plate protruding from the stator core is sandwiched between two high coil plates. For this reason, since the coil plate with the high height increases the surface area as compared with the laminates all having the same height, the heat dissipation is improved. However, since the surface area of the coil plates having a low height does not change as compared with the laminated body having the same height, the heat dissipation is not improved.

  Then, an object of this invention is to provide the stator of the rotary electric machine provided with the coil plate laminated body with favorable heat dissipation.

  A first stator of the present invention is a stator of a rotating electrical machine applied to a rotating electrical machine, in which a stator core in which a slot extending in the rotation axis direction of the rotating electrical machine is formed, and a protruding portion protruding from the stator core appears. A coil plate laminated body in which a plurality of coil plates are laminated in the rotational radial direction of the rotating electrical machine, and the protruding portion of the coil plate laminated body is in the rotational radial direction of the rotating electrical machine. The height of the inner side in the rotational radius direction is configured to be lower than the height of the intermediate portion located between the inner side and the outer side in the rotational radius direction (Claim 1).

  According to this stator, there is a height difference between the inner side and the middle part in the rotating direction in the coil plate laminate, and the surface area is increased as compared with the case where such a height difference does not exist. Heat can be released.

  In one aspect of the first stator, the protruding portion may be configured to become higher from the intermediate portion toward the outer side of the rotational radius (Claim 2). According to this aspect, not only heat is effectively dissipated from the intermediate portion of the coil plate laminated body, but also heat flows along the coil plate which gradually increases in height toward the outer side in the rotational radius direction. The heat dissipation of the coil plate laminate is improved.

  In one aspect of the first stator, the protrusion may be configured such that the height on the outer side in the rotational radius direction is lower than the height of the intermediate portion. According to this aspect, the intermediate portion of the coil plate laminated body is formed in a mountain shape having the apex, and the surface area is increased. The maximum height of the protrusion can be suppressed as compared with the case where the height of the protrusion is high.

  In one aspect of the first stator, the coil plate laminate is configured such that the plate thickness of the coil plate on the inner side in the rotational radial direction is larger than the plate thickness of the coil plate on the outer side in the rotary radial direction. A coil in which a plurality of coil end plates that are electrically connected to the coil plate laminate and have the same plate thickness as each of the plurality of coil plates are laminated in the rotational radius direction of the rotating electrical machine. You may further provide an end plate laminated body (Claim 4). According to this aspect, the coil plate and the coil end plate that are electrically connected have the same plate thickness. For this reason, when the cross-sectional areas of the coil plate and the coil end plate are made to coincide with each other in order to eliminate the increase and decrease in the electrical resistance value between the coil plate laminate and the coil end plate laminate, Can do.

  When all the coil end plates have the same shape and the above cross-sectional areas match, it is necessary to secure the height of the protruding portion of the coil plate laminate that is the counterpart of the connection due to restrictions on the shape of each coil end plate Furthermore, since the height difference of the coil plate laminate is added, the maximum height of the protrusions must be increased to some extent. However, according to this aspect, since there is no such restriction, it is possible to provide a height difference (step) while lowering the maximum height of the protruding portion of the coil plate laminate. In addition, by adopting this mode, the coil plate on the inner side in the rotation direction has a lower protruding portion and the surface area is reduced. However, since the coil plate has a larger surface area and better heat dissipation than the middle part of the coil plate laminate, the coil plate There is no problem in heat dissipation as a whole of the plate laminate.

  A second stator of the present invention is a stator of a rotating electrical machine applied to a rotating electrical machine, wherein a stator core in which a slot extending in the rotation axis direction of the rotating electrical machine is formed, and a protruding portion protruding from the stator core appears. A coil plate laminate in which a plurality of coil plates, more than three, are laminated in the rotational radius direction of the rotating electrical machine, are arbitrarily selected from the plurality of coil plates, and are adjacent to each other. Regarding the height appearing at the protrusions of the three coil plates arranged side by side, the coil plate stack is so arranged that the one coil plate in the center is not the lowest and is not the same height as any of the other two coil plates. The body is constituted (claim 5).

  According to the second stator, none of the coil plates of the coil plate laminate is sandwiched between two plates having a height higher than that. Therefore, a coil plate laminated body with good heat dissipation can be obtained as compared with the conventional one in which a high coil plate and a low coil plate are alternately stacked to form a fin shape.

  As described above, according to the first and second stators of the present invention, it is possible to obtain a rotating electrical machine including a coil plate laminate having good heat dissipation.

The perspective view which showed the stator which concerns on one form of this invention. The figure which decomposed | disassembled and showed a part of stator of FIG. Explanatory drawing which showed the state by which a coil plate laminated body is inserted in the slot of a stator core. The perspective view which concerns on the 1st form which expanded and showed the state by which the coil plate laminated body was fixed to the stator core. The figure which showed typically the state which looked at the coil plate laminated body from the V direction of FIG. The figure which showed typically the state which looked at the coil plate laminated body from the VI direction of FIG. The perspective view which concerns on the 2nd form which expanded and showed the state by which the coil plate laminated body was fixed to the stator core. The figure which showed typically the state which looked at the coil plate laminated body from the VIII direction of FIG. The figure which concerns on the modification which showed typically the state which looked at the coil plate laminated body fixed to the stator core from the rotating shaft direction. The figure which showed typically the state which looked at the coil plate laminated body from the X direction of FIG.

(First form)
The stator 1 shown in FIGS. 1 to 4 is used by being incorporated in a three-phase AC motor as an example of a rotating electrical machine. The motor incorporating the stator 1 is designed such that a rotor (not shown) rotates around a rotation axis Ax (see FIG. 1). In addition, the arrow Z attached | subjected to FIGS. 1-4 and each other figure means the rotation axis direction of a motor, and the arrow R means a rotation radial direction.

  The stator 1 includes a stator core 2 and a coil portion 3 provided on the stator core 2. The stator core 2 is formed by laminating metal plates such as steel plates in the rotation axis Ax direction. In the stator core 2, a plurality of slots 5 extending in the direction of the rotation axis Ax are formed at equal intervals in the circumferential direction (see FIG. 3). The coil unit 3 includes two coil plate laminates 10 inserted into each slot 5 of the stator core 2 and a coil end plate laminate 11 that electrically connects the coil plate laminates 10 adjacent to each other across the slot 5. And a bus bar 12 that electrically connects one inner side in the rotational radius direction and the other outer side in the radial direction of rotation of the two coil plate laminates 10 selected at a predetermined interval from the plurality of coil plate laminates 10 arranged in the circumferential direction. With.

  The coil plate laminated body 10 is configured by laminating a plurality of coil plates 15 having the same number as the number of turns of the three-phase AC motor in the rotational radius direction. The coil plate laminated body 10 is inserted into each slot 5 in a state where the protruding portion 16 protruding from the stator core 2 in the rotation axis direction appears, and is fixed to the stator core 2 in that state. As shown in FIG. 4, an insulating plate 17 is disposed between two coil plate laminates 10 inserted in the same slot 5, and these two coil plate laminates 10 are electrically insulated from each other. Yes. As shown in FIG. 2, the coil end plate laminate 11 is configured by laminating a plurality of coil end plates 19 having the same shape and size in the rotational radius direction.

  As shown in FIGS. 4 to 6, in the coil plate laminated body 10, the height H of the protruding portion 16 from which the coil plate 15 protrudes from the stator core 2 is lower on the inner side in the rotational radius direction than the intermediate portion 21, and It is comprised so that it may become so high that it goes to a rotation radial direction outer side from the intermediate part 21. As shown in FIG. Specifically, the height H gradually increases from the inside in the rotational radius direction toward the outside in the same direction. In addition, the intermediate part 21 is a site | part located in the middle of a rotation radial direction inner side and a rotation radial direction outer side. As apparent from FIG. 5, the thickness t of each coil plate 15 gradually increases toward the inside in the rotational radius direction. The height H and the thickness t of each coil plate 15 are the cross-sectional area of the coil end plate 19 that appears in a cross section orthogonal to the paper surface of FIG. 5 and parallel to the rotational radius direction, and the cross-sectional area that appears in the same cross section of the coil plate 15. Are set to match. By making these cross-sectional areas equal, the resistance value is prevented from increasing or decreasing between the coils.

  According to the stator 1 according to the first embodiment, in the coil plate laminate 10, there is a height difference between the inner side in the rotational radius direction and the intermediate portion 21, and the surface area is increased as compared with the case where there is no such height difference. The heat can be effectively radiated from the intermediate portion 21 where heat is likely to be trapped. Furthermore, since the coil plate laminated body 10 is configured to become higher from the intermediate portion 21 toward the outer side in the rotational radius direction, the heat increases along the coil plate 15 that gradually increases in the same direction. Flows. Thereby, the heat dissipation of the coil plate laminated body 10 improves.

  Moreover, the coil plate laminated body 10 is not the lowest in the height H of the central coil plate 15 among the adjacent three coil plates 15 arbitrarily selected from the plurality of coil plates 15, and the remaining two plates. The coil plate 15 is configured not to have the same height. For this reason, none of the coil plates 15 of the coil plate laminated body 10 is sandwiched between two coil plates 15 having a height higher than that. Thereby, the coil plate laminated body 10 has better heat dissipation than the conventional one in which there is a coil plate sandwiched between two high coil plates and the coil end is formed in a fin shape.

(Second form)
Next, a second embodiment of the present invention will be described with reference to FIGS. The second form is the same as the first form except for the structure of the coil plate laminate. Accordingly, the drawings relating to the configuration of the stator including the coil plate laminate and the drawings that are the same as the first embodiment are omitted, and instead, FIGS. 1 to 3 and FIG. 5 of the first embodiment are referred to, respectively. 7 and 8, the same reference numerals are assigned to the members common to the first embodiment. As shown in these drawings, the coil plate laminate 25 according to the second embodiment is configured by laminating a plurality of coil plates 27 in the rotational radius direction. The coil plate laminate 25 has two protruding portions 26 appearing from the stator core 2 and is inserted into the same slot 5 with the insulating plate 17 interposed therebetween, and is fixed to the stator core 2 in that state. As in the first embodiment, the thickness t of each coil plate 27 gradually increases toward the inner side in the rotational direction (see also FIG. 5). The feature of the second embodiment is that the intermediate portion 29 is the highest with respect to the height H of the protruding portion 26 from which the coil plate 27 protrudes, and the inside of the rotational radius and the outside of the rotational radius are lower than the intermediate portion 29, respectively. It is. That is, as apparent from FIG. 8, the coil plate laminate 25 is formed in a mountain shape with the intermediate portion 29 as a vertex. Thereby, since the surface area of the intermediate part 29 increases, the heat dissipation effect from the intermediate part 29 where heat is likely to be trapped is improved. Further, as apparent from a comparison between FIG. 6 and FIG. 8, the coil plate laminate 25 has the maximum protrusion 26 compared to the first embodiment in which the height H outside the rotation radius is higher than the intermediate portion 21. The height can be suppressed.

  Similarly to the first embodiment, the height H of the central coil plate 27 is not the lowest among the adjacent three coil plates 27 arbitrarily selected from the plurality of coil plates 27 in the second form, Moreover, the remaining two coil plates 27 are configured not to have the same height. Therefore, as compared with the conventional one in which there is a coil plate sandwiched between two high coil plates and the coil ends are fin-shaped, the coil plate laminate 25 has a heat dissipation property as in the first embodiment. Is good.

  This invention is not limited to the said form, It can implement with a various form within the range of the summary of this invention. In each said form, although the coil end plate contained in the coil end plate laminated body connected to a coil plate laminated body was the same board thickness, each board thickness does not need to be the same. For example, as shown in FIG. 9, the thickness t1 of the coil end plate 31 included in the coil end plate laminate 30 is configured to gradually increase toward the inside in the rotational radius direction, and the thickness t1 is It is also possible to make it equal to the plate thickness t2 of the coil plate 36 of the coil plate laminate 35 that is the counterpart of the connection. According to this configuration, when the cross-sectional area of the above-described cross-section of the coil end plate 31 and the cross-sectional area of the same cross-section of the coil plate 36 are matched, a height difference can be made in the coil end plate laminate 30.

  When the coil end plates are all the same shape and the cross sectional areas of the coil plate and the coil end plate are the same as in the above embodiments, the coil that is the counterpart of the connection due to restrictions on the shape of the coil end plate It is necessary to secure the height of the protruding portion of the plate laminate, and the height difference of the coil plate laminate is added, so the maximum height of the protruding portion must be increased to some extent (see FIGS. 6 and 8). ). However, according to this modification, since there is no such restriction, as shown in FIG. 10, it is possible to add a height difference (step) while reducing the maximum height of the protruding portion 38 of the coil plate laminate 35. Become. By adopting this mode, the coil plate 36 on the inner side in the rotation direction has a lower protruding portion and a reduced surface area. However, the coil plate has a larger surface area and better heat dissipation than the intermediate portion 39 of the coil plate laminate 35. Therefore, there is no problem in the heat dissipation of the coil plate laminate 35 as a whole. The modification shown in FIGS. 9 and 10 can be applied to both the first and second embodiments.

  In each of the above embodiments, a three-phase AC motor is taken as an example of a rotating electric machine as an object to which the stator is applied, but the application object is not limited to this. For example, the stator of the present invention can be applied to various rotating electric machines such as an AC generator and a motor / generator.

  In the case of the first stator of the present invention, it is sufficient that a predetermined height difference is generated as a whole of the coil plate laminate. Therefore, as long as there is a difference in height between the intermediate portion and the inside or outside in the rotational radius direction, there are locations in the coil plate laminate where the heights of the protruding portions of the two adjacent coil plates are the same. Alternatively, there may be a place where the central coil plate of the three adjacent coil plates is lowest.

  In the case of the second stator of the present invention, it is also possible to implement in a form in which the height gradually increases from the inner side toward the outer side in the rotational radius direction, contrary to the first form.

DESCRIPTION OF SYMBOLS 1 Stator 2 Stator core 5 Slot 10, 25, 35 Coil plate laminated body 11, 30 Coil end plate laminated body 15, 27, 36 Coil plate 16, 26, 38 Protrusion part 19, 31 Coil end plate 21, 29, 39 Middle part Ax Rotating axis R Rotating radial direction Z Axis direction

Claims (5)

A stator for a rotating electrical machine applied to the rotating electrical machine,
A stator core formed with a slot extending in the rotation axis direction of the rotating electrical machine, and a protruding portion protruding from the stator core is inserted into the slot, and a plurality of coil plates are stacked in the rotational radius direction of the rotating electrical machine A coil plate laminate, and
The protruding portion of the coil plate laminate has a lower inner height in the rotational radius than a height of an intermediate portion located between the inner radius and the outer radius of the rotating electrical machine. A stator for a rotating electrical machine, characterized in that it is configured as follows.   The stator according to claim 1, wherein the protruding portion is configured to become higher from the intermediate portion toward the outer side of the rotation radius.   2. The stator according to claim 1, wherein the protruding portion is configured such that a height on an outer side in the rotational radial direction is lower than a height of the intermediate portion. The coil plate laminate is configured such that the thickness of the coil plate on the inner side in the rotational radius direction is larger than the thickness of the coil plate on the outer side in the rotational radius direction,
A coil end plate that is electrically connected to the coil plate laminate and has a plurality of coil end plates that have the same thickness as the thickness of each of the plurality of coil plates, and are laminated in the rotational radius direction of the rotating electrical machine. The stator according to any one of claims 1 to 3, further comprising a laminate. A stator for a rotating electrical machine applied to the rotating electrical machine,
A stator core formed with a slot extending in the rotation axis direction of the rotating electrical machine, and a protruding portion protruding from the stator core is inserted into the slot, and a plurality of coil plates more than 3 are arranged in the rotational radius direction of the rotating electrical machine. And a laminated coil plate laminate,
With respect to the height appearing at the protrusions of three adjacently arranged coil plates arbitrarily selected from the plurality of coil plates, the central one coil plate is not the lowest, and the remaining two coils The stator of a rotating electrical machine, wherein the coil plate laminate is configured so as not to have the same height as any of the plates.

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