JP2013085362A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce heat value when applying current and suppress scale-up of a physical constitution.SOLUTION: A rotary electric machine comprises: a coil plate laminate 20 which is fitted into a groove 11 of a stator core 10; and a coil end plate laminate 30 which is located between the coil plate laminates. Each coil end plate 31 includes a cross-section having the same sectional area in a direction orthogonal to a circumferential direction, and a same board thickness. Each coil plate 24 includes a portion within the groove 11 in which a more outer plate in a radial direction has a thinner board thickness, and a coil end portion 26 which contacts with an edge face of the coil end plate 31. Each coil end portion 26 includes a cross-section having the same shape as the cross-section of each coil end plate 31 in the direction orthogonal to the circumferential direction. Each sectional area of the coil end plates 31 and each sectional area of the coil end portion 26 are respectively set so that heat value when applying current is a prescribed value or less.

Description

  The present invention relates to an annular stator core in which a plurality of grooves are radially formed at intervals, and protruding portions that are stacked in a radial direction within the grooves and protrude from respective end faces in the axial direction of the stator core A plurality of coil plates, and a plurality of coil end plates in which the ends of the projecting portions of two coil plates adjacent in the circumferential direction are connected to each pair of the coil plates. Relates to a rotating electrical machine.

  Conventionally, as described in Patent Document 1 below, this type of rotating electric machine is known. In the rotating electrical machine described in Patent Literature 1, the coil plate disposed on the outer side in the radial direction is thinner.

JP 2007-336650 A

  By the way, in the said conventional rotary electric machine, since the plate | board thickness is so thin that the coil plate arrange | positioned on the outer side of radial direction, if the length of the axial direction of each coil plate is the same, radial direction The outer coil plate has a smaller cross-sectional area (cross-sectional area perpendicular to the circumferential direction) of the plate thickness portion than the inner coil plate in the radial direction, and the electric resistance is increased. Therefore, when the stator application current is applied, the radially outer coil plate generates more heat than the radially inner coil plate, which may cause heat generation earlier. Here, in order to reduce the calorific value, it is only necessary to increase the cross-sectional area of the plate thickness portion of the coil plate. Therefore, the coil plate having a small cross-sectional area may be extended toward the axial direction of the stator core. However, the rotating electrical machine becomes larger in size in the axial direction.

  Therefore, an object of the present invention is to provide a rotating electrical machine that can improve the disadvantages of the conventional example and can reduce the amount of heat generated when a current is applied while suppressing the increase in size.

  In order to achieve the above object, the present invention includes an annular stator core in which a plurality of axial grooves are radially formed at intervals, and is laminated in the radial direction of the stator core in the grooves, A plurality of coil plates having projecting portions projecting from respective end faces in the axial direction of the stator core, and the circumferential direction of the projecting portions of the two coil plates adjacent in the circumferential direction of the stator core. In a rotating electrical machine having a stator having a plurality of coil end plates each having an end surface connected to each pair of the coil plates, each coil end plate has a cross-sectional area regardless of the radial arrangement. A cross section orthogonal to the circumferential direction of the same size, and a radial plate thickness of the same thickness regardless of the radial arrangement, and the coil plates are arranged outside the radial direction. The portion in the groove portion in which the plate thickness in the radial direction is made thinner than the one arranged on the inner side in the radial direction, and the circumferential end surface in contact with the circumferential end surface of the coil end plate A coil end portion in the projecting portion, and each coil end portion has a cross section orthogonal to the circumferential direction having the same shape as the cross section of each coil end plate. The cross-sectional areas of the cross-section of the plate and the cross-section of the coil end portion are such that the amount of heat generated by the coil end plate and the coil plate when the stator application current is applied becomes a predetermined value or less. It is characterized by setting.

  Here, it is desirable to increase the thickness of each coil end portion of each coil plate and each coil end plate.

  Further, the thickness of each coil end portion of each coil plate and each coil end plate is set so that the total value of the respective plate thicknesses is within the range of the radial thickness of the stator core. It is desirable to increase the thickness.

  The predetermined value is preferably a calorific value that does not hinder the operation and durability of the rotating electrical machine.

  In the rotating electrical machine according to the present invention, the coil end plate and the coil accompanying the application of the stator applied current with respect to the cross-sectional areas of the cross section orthogonal to the circumferential direction of the coil end plate and the cross section orthogonal to the circumferential direction of the coil end portion. The heat generation amount of the plate is set to a size that is not more than a predetermined value. For this reason, in this rotating electrical machine, the amount of heat generated by the coil end plate and the coil plate when the stator application current is applied can be kept low. In this rotating electrical machine, the cross-sectional area of the cross section of each coil end portion is a set value corresponding to the predetermined value regardless of the radial arrangement of each coil plate, and the radial arrangement of each coil plate Regardless of this, the thickness of each coil end portion is the same. Furthermore, in this rotating electrical machine, the cross-sectional area of the cross section of each coil end plate becomes a set value corresponding to the predetermined value regardless of the radial arrangement of each coil end plate, and the radial direction of each coil end plate Regardless of the arrangement, each coil end plate has the same thickness. Therefore, in this rotating electrical machine, the length in the axial direction of each coil end portion and the length in the axial direction of each coil end plate are the same length, so that the cross-sectional area of each cross section satisfies the set value as a measure There is no need to cause variations in the length in the axial direction of each. For this reason, in this rotating electrical machine, an increase in the size of the body in the axial direction can be suppressed. In particular, in this rotating electrical machine, it is possible to effectively suppress an increase in size in the axial direction by increasing the thickness of each coil end portion of each coil plate and each coil end plate. As described above, according to this rotating electrical machine, it is possible to suppress the increase in the size of the physique while suppressing the heat generation amount of the coil end plate and the coil plate to be low.

FIG. 1 is a view of a stator of a rotating electrical machine according to the present invention viewed in the axial direction. FIG. 2 is a perspective view showing a part of the stator of the rotating electrical machine according to the present invention. FIG. 3 is an enlarged schematic view of the periphery of the groove portion of the stator core. FIG. 4 is a view of the periphery of the groove portion of the stator core as viewed in the direction of arrow A in FIG. 3. FIG. 5 is a view in which the periphery of the groove portion of the stator core is viewed in the direction of arrow B in FIG. 3. FIG. 6 is a perspective view of the coil end portion of the coil plate or the coil end plate. 7 is a cross-sectional view of the periphery of the groove portion of the stator core taken along line XX in FIG. 8 is a cross-sectional view of the periphery of the groove portion of the stator core taken along line YY in FIG. 9 is a cross-sectional view of the periphery of the groove portion of the stator core taken along the line ZZ in FIG.

  Embodiments of a rotating electrical machine according to the present invention will be described below in detail with reference to the drawings. The present invention is not limited to the embodiments.

[Example]
An embodiment of a rotating electrical machine according to the present invention will be described with reference to FIGS.

  The rotating electrical machine of the present embodiment generates a magnetic field by applying an electric current to a stator coil, and rotates the rotor by the magnetic field. As this type of rotating electrical machine, for example, a three-phase AC rotating electrical machine is known. The rotor is made of, for example, a permanent magnet or an electromagnet. Further, the stator is obtained by winding a coil around a stator core. Here, the rotating electric machine will be described in detail focusing on the stator.

  Reference numeral 1 in FIGS. 1 to 3 represents a stator of the rotating electric machine. The stator 1 has a configuration roughly divided into a stator core 10, a plurality of coil plate laminates 20, and a plurality of coil end plate laminates 30, similarly to the stator of the conventional rotating electric machine described above. In FIG. 3, for convenience of explanation, a coil plate laminated body 20 including three coil plates 24 is illustrated.

  The stator core 10 is a laminated body of a plurality of annular electromagnetic steel plates, for example. A plurality of axial grooves (so-called slots) 11 are formed in the annular stator core 10 in a radial manner at intervals. One coil plate stack 20 is inserted into each groove 11. Here, the respective groove portions 11 are arranged at equal intervals. Each of the groove portions 11 penetrates from one end surface in the axial direction of the stator core 10 to the other end surface.

  In the following, unless otherwise stated, the axial direction, circumferential direction, and radial direction of the stator core 10 are simply referred to as axial direction, circumferential direction, and radial direction, respectively. Further, in the radial direction, a side facing the inner side of the stator core 10 is referred to as a radial inner side, and a side facing the outer side of the stator core 10 is referred to as a radial outer side.

  The coil plate laminate 20 exemplified here includes a pair of first coil plate laminates 21 and second coil plate laminates 22. The coil plate laminate 20 includes a holding member 23 made of an insulating material such as resin. The holding member 23 is for holding the first and second coil plate laminates 21 and 22 so as to be integrated with the side surfaces (circumferential end surfaces and radial end surfaces). The holding member 23 has an axial length substantially equal to the axial length of the groove 11, and all or most of the holding member 23 is inserted into the groove 11.

  Each of the first and second coil plate laminates 21 and 22 is obtained by laminating a plurality of plate-like coil plates 24. Each coil plate 24 is made of an electrically conductive material such as copper, and is laminated in the radial direction while being inserted into the groove 11. Each of the coil plates 24 has a length in the axial direction longer than the length in the axial direction of the groove portion 11, and both ends in the axial direction are inserted in the groove portion 11 in the axial direction of the stator core 10. It protrudes from the end face. Coil end portions 26 are formed on the respective protruding portions 25, and the coil end plate laminate 30 is connected via the coil end portions 26. Here, each coil plate 24 is shaped and arranged so that the lengths in the axial direction of the respective projecting portions 25 are equal to each other.

  In these 1st and 2nd coil plate laminated bodies 21 and 22, as for the part which exists in the groove part 11 in each coil plate 24, what is arrange | positioned radially outside is arrange | positioned radially inside. The plate thickness in the radial direction is thinner than that obtained. In each coil plate 24, the protruding portions 25 described above are provided at both ends in the axial direction of the portion existing in the groove 11. In this example, as shown in FIGS. 4 and 5, a difference in plate thickness corresponding to the radial arrangement remains at the base of the protruding portion 25 in each coil plate 24. The root means a portion interposed between the end face in the axial direction of the stator core 10 in the protruding portion 25 and the coil end portion 26. FIG. 4 shows a view A in FIG. FIG. 5 shows an arrow B in FIG. And the coil plate 24 in this FIG. 5 has shown the protrusion part 25 above the paper surface for convenience of explanation. In FIGS. 3 to 5, for convenience of explanation, a gap is provided between the coil plates 24 and the coil end plate 31, but such a gap may not exist.

  The coil end portion 26 of each coil plate 24 has a cross-sectional area Sc1a, Sc1b, Sc1c of the first cross section orthogonal to the circumferential direction in the radial direction of the coil plate 24, as shown by the hatched portions in FIG. 4 and FIG. It is molded so as to have the same size regardless of the arrangement of (Sc1 = Sc1a = Sc1b = Sc1c). The first cross section is also perpendicular to the direction of the stator applied current, as shown in FIG. The coil end portions 26 are formed so that the plate thicknesses tca, tcb, and tcc have the same thickness regardless of the radial arrangement of the coil plate 24 (tc = tca = tcb = tcc). Therefore, the length Lc1 in the axial direction of each coil end portion 26 is the same length regardless of the arrangement of the coil plate 24 in the radial direction.

  About the plate | board thickness tc of the coil end part 26, the length Lc2 of the radial direction of the coil plate laminated body 20 (The radial direction length of the groove part 11 may be used) and the number Nc of the coil plates 24 to install are used. , Can be set by the following equation 1.

  tc = Lc2 / Nc (1)

  Further, the axial length Lc1 of the coil end portion 26 is set by the following formula 2 using the plate thickness tc of the coil end portion 26 and the cross-sectional area Sc1 of the first cross section of the coil end portion 26. Can do.

  Lc1 = Sc1 / tc (2)

  On the other hand, each coil end portion 26 may be formed such that the cross-sectional areas Sc2a, Sc2b, Sc2c of the second cross section orthogonal to the axial direction have the same size regardless of the radial arrangement of the coil plate 24. (Sc2 = Sc2a = Sc2b = Sc2c) As shown by the hatched portion in FIG. 3, the cross-sectional areas Sc2a, Sc2b, and Sc2c do not necessarily have to be formed into the same size. That is, as described above, the coil end portions 26 have the same thickness tca, tcb, tcc regardless of the radial arrangement of the coil plate 24. Therefore, the circumferential length Lc3 of each coil end portion 26 is the same length in each case regardless of the radial arrangement of the coil plate 24 if the cross-sectional areas Sc2a, Sc2b, and Sc2c are the same. If the cross-sectional areas Sc2a, Sc2b, and Sc2c do not need to have the same size, the lengths differ according to the cross-sectional areas Sc2a, Sc2b, and Sc2c.

  Subsequently, the coil end plate laminate 30 is obtained by laminating a plurality of plate-like coil end plates 31. In this coil end plate laminate 30, each coil end plate 31 is held by a holding member 32, and is arranged between the protruding portions 25 of two coil plate laminates 20 adjacent in the circumferential direction. Each coil end plate 31 is made of an electrically conductive material such as copper, and is laminated in the radial direction in the arrangement state.

  One coil end plate 31 connects two coil plates 24 adjacent in the circumferential direction. The two coil plates 24 are connected to each other in the circumferential end surfaces of the coil end plates 31 at the circumferential end surfaces of the protruding portions 25 (more precisely, the coil end portions 26). Each coil end plate 31 in the coil end plate laminated body 30 is connected to each pair of two coil plates 24 adjacent in the circumferential direction.

  Each coil end plate 31 has the same cross-sectional area Se1a, Se1b, Se1c of the first cross section orthogonal to the circumferential direction regardless of the radial arrangement of the coil end plate 31, as shown by the hatched portion in FIG. It shape | molds so that it may become a magnitude | size (Se1 = Se1a = Se1b = Se1c). The first cross section is also perpendicular to the direction of the stator applied current, as shown in FIG. Each of the coil end plates 31 is formed so that the respective plate thicknesses tea, teb, and tec in the radial direction have the same thickness regardless of the arrangement in the radial direction of the coil end plate 31 (te = tea = teb). = Tec). Therefore, the length Le1 of each coil end plate 31 in the axial direction is the same length regardless of the arrangement of the coil end plates 31 in the radial direction.

  Regarding the plate thickness te of the coil end plate 31, the radial end length Le2 of the coil end plate laminate 30 (the radial length Lc2 of the coil plate laminate 20 may be used) and the coil end plate 31 to be installed. Can be set by the following equation (3).

  te = Le2 / Ne (3)

  Further, the length Le1 in the axial direction of the coil end plate 31 is set by the following formula 4 using the plate thickness te of the coil end plate 31 and the sectional area Se1 of the first cross section of the coil end plate 31. Can do.

  Le1 = Se1 / te (4)

  On the other hand, since each coil end plate 31 connects each circumferential end surface to the circumferential end surface of the coil end portion 26 as described above, the circumferential length Le3 is adjacent to the coil in the circumferential direction. It is determined depending on the distance between the end faces of the end portion 26. That is, the coil end plates 31 may have the same length Le3 regardless of the radial arrangement of the coil end plates 31, or may have different lengths. Therefore, each coil end plate 31 is formed such that the cross-sectional areas Se2a, Se2b, Se2c of the second cross sections orthogonal to the axial direction have the same size regardless of the radial arrangement of the coil end plate 31. If there is another (Se2 = Se2a = Se2b = Se2c), it may be formed into different sizes as shown by a two-dot chain line in FIG.

  Here, the cross-sectional areas Sc1 and Se1 of the first cross section of the coil end portion 26 and the first cross section of the coil end plate 31 are the heat generation of the coil plate 24 and the coil end plate 31 when the stator application current is applied. The amount is set to a size (predetermined cross-sectional area) that is not more than a predetermined value. This setting is to prevent the coil plate 24 and the coil end plate 31 from generating heat as the stator application current is applied, but not to increase the amount of heat generation to such an extent that the operation and durability of the rotating electrical machine are hindered. is there. Therefore, as the predetermined value, for example, a calorific value that does not hinder the operation (operation related to output performance or the like) and durability of the rotating electrical machine may be used.

  In particular, when the highest value among the calorific values is used, the rotary electric machine can minimize the respective cross-sectional areas Sc1 and Se1 without hindering its operation and durability. In this rotating electrical machine, each cross-sectional area Sc1 satisfies the predetermined cross-sectional area regardless of the radial arrangement of the coil plate 24, and each axial direction regardless of the radial arrangement of the coil plate 24. The plate thickness tc of each coil end portion 26 is formed to the same thickness regardless of the plate thickness of the coil plate 24 in the groove portion 11 so that the length Lc1 is constant. Further, in this rotating electric machine, each sectional area Se1 satisfies the above-mentioned predetermined sectional area regardless of the radial arrangement of the coil end plate 31, and each of the coil end plates 31 regardless of the radial arrangement of the coil end plate 31. The plate thicknesses te of the coil end plates 31 are also formed to the same thickness so that the length Le1 in the axial direction is constant. Therefore, in this rotating electrical machine, since it is not necessary to extend the coil end portion in the axial direction in order to satisfy the above-mentioned predetermined cross-sectional area, an increase in the size of the physique in the axial direction can be suppressed. Further, in this rotating electric machine, by increasing the plate thickness tc of each coil end portion 26 and the plate thickness te of each coil end plate 31, the respective cross-sectional areas Sc1 and Se1 satisfy the predetermined cross-sectional area, Since the lengths Lc1 and Le1 in the axial direction can be shortened, an increase in the size of the physique in the axial direction can also be suppressed by this.

  The amount of generated heat increases as the electrical resistance values of the coil plate 24 and the coil end plate 31 increase. For this reason, the respective cross-sectional areas Sc1 and Se1 are, in other words, such that when the stator application current is applied, the electric resistance values of the coil plate 24 and the coil end plate 31 become smaller than a predetermined value. Set to. Therefore, as the predetermined value, for example, an electric resistance value that generates a calorific value that does not hinder the operation and durability of the rotating electrical machine, particularly the highest value (boundary value) among the electric resistance values may be used. In this case, the boundary value for the predetermined cross-sectional area set based on the boundary value may be used.

  Thus, in this rotating electrical machine, the coil plate is applied when the stator application current is applied by setting the cross-sectional areas Sc1 and Se1 of the first cross sections to be larger than the boundary value of the predetermined cross-sectional area. 24 and the coil end plate 31 can be kept low, and the operation and durability of the rotating electrical machine are not hindered.

  In this rotating electrical machine, the radial thickness tc of each coil end portion 26 is the same regardless of the arrangement of the coil plate 24 in the radial direction while maintaining the setting of the cross-sectional area Sc1 of the first cross section. I am doing it. For this reason, in this rotating electrical machine, the length Lc1 in the axial direction of each coil end portion 26 can be kept the same, and by increasing the plate thickness tc of each coil end portion 26, as described above. The length Lc1 in the axial direction can be shortened. When the plate thickness tc is increased, for example, the length Lc2 in the radial direction of the coil plate laminate 20 (the total value of the plate thickness tc in the radial direction of each coil end portion 26) is set in the radial direction of the stator core 10. It is desirable to keep the thickness within the range of the thickness (difference between the outer diameter and the inner diameter) in order to prevent enlargement in the radial direction. Further, in this rotating electrical machine, the radial sectional thickness te of each coil end plate 31 is maintained at the above-described setting in the sectional area Se1 of the first cross section regardless of the arrangement of the coil end plate 31 in the radial direction. It is the same thickness in the state. For this reason, in this rotating electrical machine, the length Le1 of each coil end plate 31 in the axial direction can be kept the same, and by increasing the plate thickness te of each coil end plate 31, as described above. The length Le1 in the axial direction can be shortened. When the plate thickness te is increased, for example, the radial length Le2 of the coil end plate laminate 30 (the total value of the radial plate thicknesses te of the coil end plates 31) is the thickness of the stator core 10. It is desirable to keep it within the range of (difference between outer diameter and inner diameter) in order to prevent enlargement in the radial direction. The stator 1 can shorten the physique in the axial direction by setting the cross-sectional areas Sc1 and Se1 and the plate thicknesses tc and te. Therefore, in this rotating electrical machine, the size of the physique in the axial direction can be reduced. In this illustration, the first cross section of the coil end portion 26 and the first cross section of the coil end plate 31 have the same shape.

  In addition, about each cross-sectional area Sc1, Se1, even if it makes it larger than the boundary value of said predetermined cross-sectional area, the emitted-heat amount can be restrained low. However, along with this, the coil end portion 26 and the coil end plate 31 become large, and the size of the stator 1, that is, the rotating electrical machine, becomes large. Therefore, in this rotating electrical machine, by setting the respective cross-sectional areas Sc1 and Se1 to the boundary values of the above-mentioned predetermined cross-sectional areas, the amount of heat generated by the coil end portion 26 and the coil end plate 31 is kept low, and the large size Can be suppressed. In particular, in this rotating electric machine, by increasing the plate thicknesses tc and te of the coil end portion 26 and the coil end plate 31, the heat generation amount of the coil end portion 26 and the coil end plate 31 can be kept low, and the size of the body can be reduced. Is possible.

  Here, in each coil plate 24, if the cross-sectional area Sc1 of the first cross-section of the coil end portion 26 can maintain a size equal to or greater than the boundary value of the predetermined cross-sectional area, The plate thickness tc in the radial direction of the coil end portion 26 may be increased or decreased with respect to the plate thickness in the radial direction. For example, in the radially inner coil plate 24 on the left side of FIG. 4, the radial plate thickness tc of the coil end portion 26 is smaller than the plate thickness in the groove 11. In this example, as shown in FIG. 7, the circumferential length Lc3 of the coil end portion 26 of the radially inner coil plate 24 is longer than the circumferential length of the portion in the groove portion 11. Further, in the coil plate 24 in the middle of the paper surface of FIG. 4, the plate thickness in the groove portion 11 and the plate thickness tc in the radial direction of the coil end portion 26 are substantially uniform. In this example, as shown in FIG. 8, the circumferential length Lc3 of the coil end portion 26 and the circumferential length of the portion in the groove portion 11 of the middle coil plate 24 are substantially uniform. . Further, in the coil plate 24 on the right side in the drawing in FIG. 4, the plate thickness tc in the radial direction of the coil end portion 26 is thicker than the plate thickness in the groove portion 11. In this example, as shown in FIG. 9, the circumferential length Lc3 of the coil end portion 26 of the radially outer coil plate 24 and the circumferential length of the portion in the groove portion 11 are substantially uniform. ing.

DESCRIPTION OF SYMBOLS 1 Stator 10 Stator core 11 Groove part 20 Coil plate laminated body 21 1st coil plate laminated body 22 2nd coil plate laminated body 24 Coil plate 26 Coil end part 30 Coil end plate laminated body 31 Coil end plate Sc1 Coil end part Section area of first section Sc2 Section area of second section of coil end section Se1 Section area of first section of coil end plate Se2 Section area of second section of coil end plate tc Thickness of coil end section te Coil end plate Plate thickness

Claims (4)

An annular stator core in which a plurality of axial grooves are radially formed at intervals, and is laminated in the radial direction of the stator core in the groove, from each axial end surface of the stator core A plurality of coil plates having protruding portions that are protruded, and the circumferential end surfaces of the protruding portions of the two coil plates adjacent in the circumferential direction of the stator core, for each pair of coil plates. In a rotating electrical machine including a stator having a plurality of connected coil end plates,
Each of the coil end plates has a cross-section perpendicular to the circumferential direction having the same cross-sectional area regardless of the radial arrangement, and a radial plate thickness of the same thickness regardless of the radial arrangement. Have
Each coil plate has a portion in the groove portion in which the plate thickness in the radial direction is made thinner than the one arranged in the radial direction as compared to the one arranged in the radial direction, and the coil end plate A coil end portion in the projecting portion provided with the circumferential end surface in contact with the circumferential end surface;
Each of the coil end portions has a cross section orthogonal to the circumferential direction that has the same shape as the cross section of each of the coil end plates,
The cross-sectional areas of the cross-section of the coil end plate and the cross-section of the coil end portion are such that the amount of heat generated by the coil end plate and the coil plate when a stator application current is applied is less than a predetermined value. A rotating electric machine characterized by being set to be.   2. The rotating electrical machine according to claim 1, wherein a thickness of each coil end portion of each coil plate and each coil end plate is increased.   The thicknesses of the coil end portions of the coil plates and the coil end plates are increased so that the total value of the thicknesses of the respective coil plates is within the range of the radial thickness of the stator core. The rotating electrical machine according to claim 1 or 2, characterized in that   The rotating electrical machine according to claim 1, wherein the predetermined value is a calorific value that does not hinder the operation and durability of the rotating electrical machine.

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