JP2006014463A - Stator core and rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator core which can improve the cooling efficiency in the stator core provided in an inner rotor type rotating electric machine, and to provide the rotary electric machine having the stator core. <P>SOLUTION: A ring part 13 is formed by alternately laminating a first ring plate 21 and a second ring plate 31. The ring plate 21 has a first heat-dissipating part made by alternately forming a first heat-dissipating recess 27 and a first heat-dissipating projection 28 along a circumferential direction. The second ring plate 31 has a second heat-dissipating part made by alternately forming a second heat-dissipating recess 37 and a second heat-dissipating projection 38 along the circumferential direction. In both the ring plates 21 and 31, the first heat-dissipating part and the second heat-dissipating part are formed so that the first heat-dissipating recess 27 and the second heat-dissipating projection 38 and further the first heat-dissipating projection 28 and the second heat-dissipating recess 37 are formed at relatively deviated positions, along the circumferential direction so as to be arranged alternately along the axial direction of the stator core 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rotating electric machine, and more particularly to a stator core provided in the rotating electric machine.

  2. Description of the Related Art Conventionally, a rotating electrical machine, for example, an inner rotor type motor, is provided with a structure for cooling a stator core around which a coil that generates heat when the motor is driven is wound. For example, the stator core of the motor disclosed in Patent Document 1 has a cylindrical shape, and a plurality of grooves formed continuously along the axial direction are arranged at equiangular intervals in the circumferential direction on the outer circumferential surface thereof. Yes. A ventilation path through which the cooling air flows is constituted by the inner peripheral surface of the groove and the inner peripheral surface of the frame in which the stator core is accommodated and fixed. Further, three air holes penetrating along the axial direction are provided at equal angular intervals in the circumferential direction between the grooves. The motor is provided with an outer fan for guiding cooling air to the ventilation path and an inner fan for circulating air inside the motor. When the motor is driven, the outer fan fan and the inner fan fan rotate accordingly. The air introduced by the external fan is guided to the ventilation path to cool the stator core. Further, the air circulated through the motor by the inner fan fan passes through the air holes to cool the stator core.

As a rotating electrical machine having a structure for cooling a stator core, there is one disclosed in Patent Document 2. The stator core of this rotating electric machine has a cylindrical shape. In the stator core, a plurality of ventilation holes penetrating along the radial direction are formed in the circumferential direction. The ventilation holes are also formed at a plurality of locations in the axial direction. The rotating electrical machine includes a gas cooler, and the cooling gas cooled by the gas cooler is introduced to the stator core side by a fan provided in the rotating electrical machine. A part of the cooling gas passes through the ventilation holes to cool the stator core.
JP 2002-10575 A JP-A-10-98850

  By the way, the motor and the rotating electrical machine disclosed in Patent Document 1 and Patent Document 2 include a cooling fan. In the case of a motor and a rotating electrical machine having a fan as described above, the stator core is sufficiently cooled by cooling the stator core in the air passages and holes formed in a plurality of locations or in the air holes. However, in a small motor, a space with a fan may not be ensured. In order to reduce the manufacturing cost, the number of parts may be reduced as a motor without a fan. Furthermore, depending on the location where the motor is used, it may not be desirable to provide a fan because the wind noise of the fan becomes a noise. As described above, in the motor having no fan, even if the motor and the stator core of the rotating electrical machine disclosed in Patent Literature 1 and Patent Literature 2 are provided, the air passages and the air holes formed in a plurality of locations, or Since the surface area of the ventilation holes is not so large, the stator core may not be sufficiently cooled. As a result, further improvement in heat dissipation efficiency is desired.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a stator core that can improve cooling efficiency in a stator core provided in an inner rotor type rotating electrical machine, and a rotating electrical machine including the stator core. It is to provide.

  In order to solve the above-described problems, an invention according to claim 1 is a substantially cylindrical stator core provided in an inner rotor type rotating electric machine and wound with a winding, and an outer peripheral surface of the stator core includes a shaft. The heat radiation recessed part and the heat radiation convex part arrange | positioned alternately along the direction are provided.

  According to a second aspect of the present invention, in the stator core according to the first aspect, the heat radiating concave portions and the heat radiating convex portions have heat radiating portions formed alternately along the circumferential direction and are laminated in the axial direction. A plurality of core plates are provided.

  According to a third aspect of the present invention, in the stator core according to the second aspect, the circumferential position is arranged such that the heat radiating concave portions and the heat radiating convex portions are alternately arranged along the axial direction on the outer peripheral surface of the stator core. Are provided with a plurality of the core plates that are stacked while being relatively shifted.

  According to a fourth aspect of the present invention, in the stator core according to the second aspect of the present invention, the stator core according to the second aspect includes a plurality of the two types of the core plates stacked alternately in the axial direction, and the two types of the core plates are the outer peripheral surfaces of the stator core. The heat radiation recesses and the heat radiation projections are provided at the positions relatively displaced along the circumferential direction so that the heat radiation protrusions are alternately arranged along the axial direction.

  According to a fifth aspect of the present invention, in the stator core according to the second aspect of the present invention, the stator core includes a plurality of one type of the core plates stacked alternately on the front and back sides, and the core plate is arranged on the outer peripheral surface of the stator core with the heat radiating recess. The heat dissipating part formed so that the circumferential position of the heat dissipating part is shifted between the core plate facing forward and the core plate facing back so that the heat dissipating convex parts are alternately arranged along the axial direction. It has.

A sixth aspect of the present invention is the stator core according to any one of the first to fifth aspects, wherein the stator core includes a plurality of teeth portions arranged radially and wound with the windings. It is composed of a substantially cylindrical ring portion that fixes the teeth portion on the radially outer side,
The outer peripheral surface of the ring portion is provided with the heat radiating concave portions and the heat radiating convex portions that are alternately arranged along the axial direction.

  The invention according to claim 7 is an inner rotor type rotating electrical machine having a substantially cylindrical stator core around which windings are wound, and is arranged alternately on the outer peripheral surface of the stator core along the axial direction. The heat radiation concave part and the heat radiation convex part are provided.

(Function)
According to the first and seventh aspects of the present invention, the heat radiating concave portions and the heat radiating convex portions are alternately arranged along the axial direction on the outer peripheral surface of the stator core. Therefore, both end surfaces in the axial direction of the heat radiating protrusions are exposed, so the surface area of the stator core is larger than when the grooves formed continuously along the axial direction are formed on the outer peripheral surface of the stator core, and heat dissipation efficiency is improved. Can be made. Furthermore, the stator core can be cooled without the need for parts such as a fan that actively circulates air. Therefore, it is possible to realize a reduction in manufacturing cost by reducing the number of parts and a reduction in the size of the rotating electrical machine.

  According to the invention described in claim 2, the stator core is formed by laminating in the axial direction a core plate having a heat radiation portion in which a heat radiation recess and a heat radiation projection are alternately formed along the circumferential direction. The surface area also increases in the circumferential direction. Therefore, the cooling efficiency of the stator core is further improved.

  According to the invention described in claim 3, the stator core has a plurality of core plates arranged in the circumferential direction so that the heat radiating concave portions and the heat radiating convex portions are alternately arranged along the axial direction on the outer peripheral surface of the stator core. It is formed by laminating with the positions relatively shifted. A stator core with improved heat dissipation efficiency can be easily formed by simply laminating a plurality of core plates with their circumferential positions relatively shifted.

  According to the fourth aspect of the present invention, the stator core is formed by alternately laminating two types of core plates formed in positions where the heat radiating portions are relatively shifted along the circumferential direction in the axial direction. . Therefore, by simply laminating the two types of core plates, the heat radiating concave portions and the heat radiating convex portions are alternately arranged along the axial direction on the outer peripheral surface of the stator core. As a result, a stator core with improved heat dissipation efficiency can be easily formed using two types of core plates.

  According to the invention described in claim 5, the stator core is formed by alternately laminating one type of core plate formed so that the circumferential direction position of the heat radiating portion is shifted between the front side and the back side. . Therefore, it is possible to form the stator core more easily than to form the stator core using several types of core plates. In addition, by manufacturing the stator core using one type of core plate, the manufacturing cost can be reduced as compared with the case where the stator core is manufactured using several types of core plates.

  According to the invention described in claim 6, the stator core includes a plurality of tooth portions and a ring portion that fixes the tooth portions on the radially outer side. Even in such a divided stator core, the outer peripheral surface of the ring portion is provided with heat radiation concave portions and heat radiation convex portions alternately arranged along the axial direction, thereby improving the heat dissipation of the stator core. Can be made.

  ADVANTAGE OF THE INVENTION According to this invention, in the stator core with which an inner rotor type rotary electric machine is equipped, the stator core with which cooling efficiency is improved, and the rotary electric machine provided with this stator core can be provided.

(First embodiment)
A first embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 shows a motor 1 as a rotating electrical machine of the present embodiment. The motor 1 is a magnet-embedded motor, and includes a housing 2, a stator 3, and a rotor 4.

  The housing 2 includes a substantially bottomed cylindrical case 5 and a lid 6 that closes the opening 5 a of the case 5. The stator 3 is fixed to the case 5 by a support member (not shown) provided in the case 5. The stator 3 is fixed with a gap between the outer peripheral surface of the stator 3 and the inner peripheral surface of the case 5, and air can flow in the axial direction in the gap. The rotor 4 is rotatably accommodated inside the stator 3 by supporting the rotation shaft 7 by bearings 8 a and 8 b provided on the case 5 and the lid 6.

  The stator 3 includes a stator core 11 and a winding 12. As shown in FIG. 2A, the stator core 11 includes a substantially cylindrical ring portion 13 and a plurality of (core) rings radially arranged inside the ring portion 13 and fixed radially outward to the ring portion 13. 12 in the first embodiment).

  As shown in FIG. 3A, the ring portion 13 is formed by alternately stacking the first ring plate 21 constituting the core plate and the second ring plate 31 constituting the core plate alternately in the axial direction. (In FIG. 3A, only three of the ring plates 21 and 31 constituting the ring portion 13 are shown).

  First, the first ring plate 21 will be described. The first ring plate 21 is formed in a substantially annular shape by a plate material such as a steel plate. On the inner peripheral surface 22 of the first ring plate 21, a plurality (12 in this embodiment) of projecting pieces 23 projecting radially inward from the inner peripheral surface 22 are formed. The protruding pieces 23 are arranged at equal angular intervals in the circumferential direction of the first ring plate 21. When viewed from the axial direction, the protruding pieces 23 have a substantially rectangular shape along the circumferential direction of the first ring plate 21. There is no.

  A plurality of (six in this embodiment) grooves extending from the front surface to the back surface along the axial direction of the rotating shaft 7 (the front and back direction of the first ring plate 21) on the outer peripheral surface 24 of the first ring plate 21. 25 are formed at equal angular intervals in the circumferential direction, and the position of the groove 25 corresponds to the center of the protruding piece 23 in the circumferential direction. These grooves 25 constitute a welded portion 13b (see FIG. 2A) for joining the stacked first ring plate 21 and second ring plate 31. The groove 25 has a semicircular shape when viewed from the axial direction.

  Further, on the outer peripheral surface 24 of the first ring plate 21, a first heat radiating portion 26 is provided between the grooves 25. As shown in FIG. 3B, the first heat radiating portion 26 includes a plurality of first heat radiating concave portions 27 and first heat radiating convex portions 28 alternately formed in the circumferential direction between the grooves 25. Being done. The first heat radiation recess 27 is formed so as to extend from the back surface to the front surface along the axial direction of the rotating shaft 7. The first heat radiation recess 27 has a semicircular shape when viewed from the axial direction, and is formed so as to be distinguishable from the groove 25. Such first heat radiation recesses 27 are formed between the grooves 25 with a certain distance along the circumferential direction between the adjacent first heat radiation recesses 27. In the first embodiment, the first heat dissipation recesses 27 are formed with an interval equal to the circumferential width of the first heat dissipation recesses 27. And the convex part which protrudes in the radial direction outer side formed between this 1st thermal radiation recessed part 27 by forming the 1st thermal radiation recessed part 27 turns into the 1st thermal radiation convex part 28. FIG. In the first embodiment, 18 first heat radiating recesses 27 are formed between the grooves 25, respectively. By forming the 18 first heat radiating recesses 27, the 17 first heat radiating recesses 27 are formed. A heat radiation convex portion 28 is formed.

  Next, the second ring plate 31 will be described. As shown in FIG. 3A, the second ring plate 31 is formed in a substantially annular shape with a plate material such as a steel plate, like the first ring plate 21. On the inner peripheral surface 32 of the second ring plate 31, a plurality (12 in this embodiment) of projecting pieces 33 projecting radially inward from the inner peripheral surface 32 are formed. The protruding pieces 33 are formed at equal angular intervals in the circumferential direction of the second ring plate 31, and when viewed from the axial direction, the longitudinal direction forms a rectangular shape along the circumferential direction of the second ring plate 31. Yes. Therefore, when the second ring plate 31 and the first ring plate 21 are laminated in the axial direction, the protruding piece 33 and the protruding piece 23 are overlapped to form the protruding portion 13c (FIG. 4A). )reference).

  A plurality of (six in this embodiment) grooves extending from the front surface to the back surface along the axial direction of the rotating shaft 7 (front and back direction of the second ring plate 31) on the outer peripheral surface 34 of the second ring plate 31. 35 are formed at equiangular intervals in the circumferential direction, and the position of the groove 35 corresponds to the center of the protruding piece 33 in the circumferential direction. These grooves 35 together with the groove 25 of the first ring plate 21 constitute a welded portion 13b.

  Further, on the outer peripheral surface 34 of the second ring plate 31, a second heat radiating portion 36 is provided between the grooves 35. As shown in FIG. 3B, in the second heat radiating portion 36, a plurality of second heat radiating concave portions 37 and second heat radiating convex portions 38 are alternately formed between the grooves 35 along the circumferential direction. Being done. Similar to the first heat dissipation recess 27, the second heat dissipation recess 37 is formed to extend from the front surface to the back surface along the axial direction of the rotating shaft 7. The second heat radiation recess 37 has a semicircular shape when viewed from the axial direction, and is formed so as to be distinguishable from the groove 35. Further, in the first embodiment, the circumferential width of the second heat radiating recess 37 is formed to be equal to the circumferential width of the first heat radiating recess 27, that is, the first heat radiating convex portion 28. . Such second heat radiation recesses 37 are formed between the grooves 35 with a certain interval along the circumferential direction between the adjacent second heat radiation recesses 37, and this first embodiment. Then, the second heat radiation recess 37 is formed with an interval equal to the circumferential width of the second heat radiation recess 37. And the convex part which protrudes in the radial direction outer side formed between this 2nd thermal radiation recessed part 37 by forming the 2nd thermal radiation recessed part 37 turns into the 2nd thermal radiation convex part 38. FIG. In the first embodiment, 18 second heat radiation recesses 37 are formed between the grooves 35, respectively, and 17 second heat radiation recesses 37 are formed, so that 17 second heat radiation recesses 37 are formed. A heat radiation convex portion 38 is formed.

  In the first ring plate 21 and the second ring plate 31, the first heat radiating portion 26 and the second heat radiating portion 36 are the first heat radiating concave portion 27 and the second heat radiating convex portion 38, and The first heat radiating convex portions 28 and the second heat radiating concave portions 37 are formed at positions relatively displaced along the circumferential direction so as to be alternately arranged along the axial direction. Specifically, the second heat radiating portion 36 has a circumference corresponding to one first heat radiating recess 27 with respect to the circumferential position of the first heat radiating portion 26 formed in the first ring plate 21 between the grooves 35. It is formed at a position shifted counterclockwise by the length of the direction. Accordingly, as shown in FIG. 4A, when the first ring plate 21 and the second ring plate 31 are alternately stacked so that the grooves 25 and the grooves 35 are in a line in the axial direction, The first heat radiating concave portions 27 and the second heat radiating convex portions 38 are alternately arranged along the axial direction, and the first heat radiating convex portions 28 and the second heat radiating concave portions 37 are alternately arranged along the axial direction. Placed in. As a result, as shown in FIGS. 4B and 2B, the axially opposite end surfaces 28 a of the first heat radiating convex portion 28 are formed on the outer peripheral surface 13 a of the ring portion 13, that is, the outer peripheral surface 11 a of the stator core 11. , 28b and both end faces 38a, 38b in the axial direction of the second heat radiation convex portion 38 are exposed.

  The first ring plate 21 and the second ring plate 31 that are alternately stacked in the axial direction are joined by welding to the welded portion 13b formed by the groove 25 and the groove 35, and the ring portion 13 is joined. Form.

  As shown in FIG. 4A, the tooth portion 14 is formed by laminating a plurality of tooth pieces 41 constituting the core plate in the axial direction (in FIG. 4A, the tooth portion 14 is constituted. Only three of the teeth pieces 41 are shown). The teeth piece 41 includes a substantially rectangular teeth piece body 42, an extension piece 43 extending at both ends in the circumferential direction of the stator core 11 at the distal end of the teeth piece body 42, and a base end (reverse side) of the teeth piece body 42. And a fixed piece 44 extending in the radial direction and circumferential direction on the extended piece 43 side). The fixing piece 44 constitutes the fixing portion 14a when the tooth piece 41 is laminated to form the tooth portion 14. And the fixing | fixed part 14a becomes a shape corresponding to between this protrusion part 13c so that it may fit between the protrusion parts 13c of the ring part 13. As shown in FIG. The stator core 11 is formed by fitting these tooth portions 14 between the protruding portions 13 c of the ring portion 13.

  As shown in FIG. 1, the stator core 11 configured as described above is fixed with a gap between the inner peripheral surface 5 b of the case 5 and the outer peripheral surface 11 a of the stator core 11. The teeth 12 are wound with the windings 12 via insulators 15.

  The rotor 4 is rotatably accommodated inside the stator 3. The rotor 4 includes a rotor core 51 formed by stacking a plurality of disk-shaped core sheets. In FIG. 1, illustration of boundary lines between a plurality of core sheets is omitted. A through hole 51a is formed at the axial center of the rotor core 51, and the rotary shaft 7 is inserted into the through hole 51a.

  Further, as shown in FIG. 2 a, the rotor core 51 includes arc-shaped slit portions 51 b that are curved in the opposite direction with respect to the outer peripheral surface of the rotor core 51 when viewed from the axial direction of the rotor core 51. Eight are formed. An arcuate permanent magnet 52 that is curved so as to correspond to the slit portion 51b is inserted into each slit portion 51b.

  In the motor 1 configured as described above, when a drive current is supplied to the winding 12 from the outside, a rotating magnetic field is generated in the stator 3, thereby rotating the rotor 4. When the winding 12 generates heat by supplying a driving current to the winding 12, the heat is generated from the first heat radiating convex portion 28, the first heat radiating concave portion 27 formed on the outer peripheral surface 11a of the stator core 11, The heat is radiated from the second heat radiating recess 37 and the second heat radiating convex 38 into the air. Therefore, the stator core 11 is cooled.

As described above, the first embodiment has the following effects.
(1) On the outer peripheral surface 13a of the ring portion 13, that is, on the outer peripheral surface 11a of the stator core 11, a first heat radiating concave portion 27 and a second heat radiating convex portion 38 are further provided. The heat radiating recesses 37 are alternately arranged along the axial direction. Therefore, since both end surfaces 28a, 28b, 38a, 38b in the axial direction of the first heat radiating convex portion 28 and the second heat radiating convex portion 38 are exposed, a continuous groove is formed along the axial direction of the outer peripheral surface 11a. The surface area becomes larger than the case. As a result, the cooling efficiency of the stator core 11 can be improved. Furthermore, the stator core 11 can be cooled even without a fan or other component that actively circulates air. Therefore, it is possible to realize a reduction in manufacturing cost by reducing the number of parts and a reduction in the size of the motor 1.

  (2) The first heat radiating portion 26 provided on the first ring plate 21 is formed by alternately forming the first heat radiating concave portions 27 and the first heat radiating convex portions 28 along the circumferential direction. is there. Similarly, the second heat radiating portion 36 provided on the second ring plate 31 is formed by alternately forming second heat radiating concave portions 37 and second heat radiating convex portions 38 along the circumferential direction. is there. Therefore, the surface area of the stator core 11 increases not only in the axial direction but also in the circumferential direction. As a result, the cooling efficiency of the stator core 11 can be further improved.

  (3) The stator core 11 includes a first ring plate 21 and a second ring plate 31 formed at positions where the first heat radiating portion 26 and the second heat radiating portion 36 are relatively shifted in the circumferential direction. Are formed by alternately laminating them in the axial direction. Therefore, only by laminating the first ring plate 21 and the second ring plate 31 alternately in the axial direction, the first heat radiation recess 27 and the second ring are formed on the outer peripheral surface 11a of the stator core 11 (ring portion 13). The heat radiation convex portions 38 are alternately arranged along the axial direction, and the first heat radiation convex portions 28 and the second heat radiation concave portions 37 are alternately arranged along the axial direction. As a result, the stator core 11 with improved heat dissipation efficiency can be easily formed using the two types of ring plates 21 and 31.

  (4) The first heat radiating concave portions 27 and the second heat radiating convex portions 38, and further the first heat radiating convex portions 28 and the second heat radiating concave portions 37 are alternately arranged along the axial direction. The heat generated by 12 is dissipated. Therefore, since it is not necessary to provide separate parts for cooling such as heat radiation fins, the motor 1 can be easily reduced in size and weight. Further, since there is no need to provide separate parts such as heat radiating fins, when the physique is equivalent to a motor provided with other parts such as heat radiating fins, the stator core 11 can be enlarged by the amount of the separate parts. As a result, the output of the motor 1 can be improved. Furthermore, when the output is equivalent to the physique equivalent to the motor provided with other parts such as heat radiating fins, the stator core 11 can be enlarged by the amount of the different parts, and the amount of the permanent magnets 52 can be reduced. Can be reduced.

  (5) The stator core 11 includes a ring portion 13 and a plurality of teeth portions 14 fixed to the ring portion 13. Even in the stator core 11 divided in this way, the first heat radiating concave portions 27 and the second heat radiating convex portions 38 are alternately arranged along the axial direction on the outer peripheral surface 13a of the ring portion 13. Since the first heat radiating convex portions 28 and the second heat radiating concave portions 37 are alternately arranged along the axial direction, the heat dissipation of the stator core 11 can be improved.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. In addition, about the structure similar to the said 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

The ring portion 60 of the second embodiment is provided in the stator core 11 in place of the ring portion 13 of the first embodiment.
As shown in FIG. 5A, the ring portion 60 of the second embodiment is formed by laminating ring plates 61 constituting a core plate in the axial direction (in FIG. 5A, the ring portion 60 is formed). Only three of the ring plates 61 constituting the same are shown). The ring plate 61 is formed in a substantially annular shape by a plate material such as a steel plate. On the inner peripheral surface 62 of the ring plate 61, a plurality of (in this embodiment, twelve) projecting pieces 63 projecting radially inward from the inner peripheral surface 62 are formed. The protruding pieces 63 are arranged at equal angular intervals in the circumferential direction of the ring plate 61, and when viewed from the axial direction, the longitudinal direction has a substantially rectangular shape along the circumferential direction of the ring plate 61.

  A plurality (six in this embodiment) of grooves 65 extending from the front surface to the back surface along the front and back direction of the ring plate 61 are formed on the outer peripheral surface 64 of the ring plate 61 at equal angular intervals in the circumferential direction. The position 65 corresponds to the center of the protruding piece 63 in the circumferential direction. The groove 65 constitutes a welded portion 13b for joining the stacked ring plates 61. The groove 65 has a semicircular shape when viewed from the axial direction.

  Further, on the outer peripheral surface 64 of the ring plate 61, heat radiation portions 66 are formed between the grooves 65. As shown in FIG. 5B, the heat radiating portion 66 includes heat radiating concave portions 67 and heat radiating convex portions 68 that are alternately formed along the circumferential direction between the grooves 65.

  The heat radiation recess 67 is formed to extend from the front surface to the back surface along the axial direction. The heat radiating recess 67 has a semicircular shape when viewed from the axial direction, and is formed so as to be distinguishable from the groove 65. Such a heat radiating recess 67 is formed between the grooves 65 with a certain space between the adjacent heat radiating recess 67. In the second embodiment, the heat radiating recess 67 is formed with an interval equal to the circumferential width of the heat radiating recess 67. And the convex part which protrudes to the radial direction outer side formed between this thermal radiation recessed part 67 by forming the thermal radiation recessed part 67 turns into the thermal radiation convex part 68. FIG. In the second embodiment, 18 heat radiation recesses 67 are formed between the grooves 65, and 17 heat radiation protrusions 68 are formed by forming 18 heat radiation recesses 67.

  The heat radiating recess 67 as described above is formed so that the circumferential position of the heat radiating portion 66 is shifted between the front-facing ring plate 61 and the reverse-side ring plate 61. Specifically, in the ring plate 61 facing forward, the heat radiating portion 66 has a distance L1 between the groove 65 on the clockwise side of the heat radiating portion 66 and the heat radiating recess 67 located at the end on the clockwise side of the heat radiating portion 66. It is located at a position shorter than the distance L2 between the groove 65 on the counterclockwise side 66 and the heat radiating recess 67 located at the end on the counterclockwise side of the heat radiating portion 66 by the length of one heat radiating recess 67. Accordingly, when the groove 65 is alternately stacked so that the grooves 65 are arranged in a row in the axial direction, the heat-dissipating recess 67 of the face-up ring plate 61 and the face-down ring plate 61 are faced to each other. The heat radiation convex portions 68 of the plate 61 are alternately arranged along the axial direction. At the same time, the heat radiating convex portions 68 of the front-facing ring plate 61 and the heat radiating concave portions 67 of the reverse facing ring plate 61 are alternately arranged along the axial direction. Thereby, both end surfaces 68a and 68b in the axial direction of the heat radiating convex portion 68 are exposed at the outer peripheral surface 60a of the ring portion 60, that is, the outer peripheral surface 11a of the stator core 11.

  The ring plates 61 that are alternately stacked on the front and back sides are joined by welding to the welded portion 13 b formed by the groove 65 to form the ring portion 60. Then, the plurality of tooth portions 14 are fitted to the ring portion 60 to form the stator core 11 of the second embodiment.

  In the motor 1 having the stator core 11 including the ring portion 60 configured as described above, when the drive current is supplied to the winding 12 and the winding 12 generates heat, the heat is applied to the outer peripheral surface 64 of the ring portion 60. The heat is radiated into the air from the formed heat radiating recess 67 and the heat radiating convex 68. Thereby, the stator core is cooled.

As described above, the second embodiment has the following effects in addition to the same effects as the effects (4) and (5) of the effects of the first embodiment.
(1) On the outer peripheral surface 64 of the ring portion 60, that is, on the outer peripheral surface 11 a of the stator core 11, the heat radiating concave portions 67 and the heat radiating convex portions 68 are alternately arranged along the axial direction. Therefore, since both end surfaces 68a and 68b in the axial direction of the heat radiating convex portion 68 are exposed, the surface area becomes larger than the case where grooves formed continuously along the axial direction are formed on the outer peripheral surface 11a of the stator core 11. As a result, the cooling efficiency of the stator core 11 can be improved. Furthermore, the stator core 11 can be cooled even without a fan or other component that actively circulates air. Therefore, it is possible to realize a reduction in manufacturing cost by reducing the number of parts and a reduction in the size of the motor 1.

  (2) Since the ring portion 60 is formed by laminating the ring plate 61 including the heat radiating portions 66 in which the heat radiating concave portions 67 and the heat radiating convex portions 68 are alternately formed along the circumferential direction, the stator core The surface area of 11 can be increased also in the circumferential direction. Accordingly, the cooling efficiency of the stator core 11 can be further improved.

  (3) The ring portion 60 constituting the stator core 11 includes one type of ring plate 61 formed so that the circumferential position of the heat radiating portion 66 is shifted between the front-facing ring plate 61 and the reverse-side ring plate 61. It is formed by alternately laminating. Therefore, it is possible to form the ring part 60 more easily than to form the ring part 60 using several types of ring plates 61. Further, by manufacturing the stator core 11 using one type of ring plate 61, the manufacturing cost can be reduced as compared with the case where the stator core 11 is manufactured using several types of ring plates.

In addition, you may change embodiment of this invention as follows.
In each of the above embodiments, the ring portions 13 and 60 are formed by laminating the first ring plate 21 and the second ring plate 31 or the ring plate 61 and then joining the ring plates 21, 31 and 61 by welding. However, the ring plates 21, 31, 61 may be integrally fixed by caulking in the axial direction. In this case, it is good also as a structure which does not form the welding part 13b. Further, when the ring plates 21, 31, 61 are stacked, the ring plates 21, 37, 67 and the heat dissipation protrusions 28, 38, 68 are alternately arranged in the axial direction. The heat radiating portions 26, 36, 66 may be formed on the entire outer peripheral surfaces 24, 34, 64 of the 31, 61.

  In the first embodiment, the first heat radiating portion 26 includes 18 first heat radiating recesses 27, and the second heat radiating portion 36 includes 18 second heat radiating recesses 37. In the second embodiment, the heat radiating portion 66 includes 18 heat radiating recesses 67. The number of these heat radiation recesses 27, 37, and 67 is not limited to 18, and may be 17 or less, or 19 or more. When the number of the heat radiation recesses 27, 37, and 67 is 17 or less, the ring plates 21, 31, and 61 are easily formed when the motor 1 is small. Further, when the number of the heat radiation recesses 27, 37, and 67 is 19 or more, the surface area of the stator core 11 becomes larger, and the cooling efficiency can be further improved.

  In each of the above embodiments, the heat radiating recesses 27, 37, and 67 and the heat radiating protrusions 28, 38, and 68 are formed to have the same width in the circumferential direction. For example, the heat radiating recesses 27, 37, 67 may be formed such that the circumferential width of the heat radiating recesses 27, 37, 67 is longer than the circumferential width of each of the heat radiating protrusions 28, 38, 68. Alternatively, conversely, it may be formed so as to be shorter than the circumferential width of each of the heat radiation convex portions 28, 38, 68. Further, each of the heat radiating recesses 27, 37, 67 and each of the heat radiating convex portions 28, 38, 68 is formed with a constant width in the circumferential direction, but may be formed with a different width individually. Good.

  In each of the above embodiments, each of the heat radiation recesses 27, 37, and 67 has a semicircular shape when viewed from the axial direction, but is not limited thereto. Each of the heat radiation recesses 27, 37, and 67 may have a rectangular shape or a polygonal shape such as a triangle as viewed from the axial direction. Similarly, the shape of each heat radiation convex part 28,38,68 may also be a polygonal shape such as a rectangular shape or a triangle as viewed from the axial direction.

  In the first embodiment, the ring portion 13 is formed by laminating two types of ring plates, the first ring plate 21 and the second ring plate 31, but three or more types of ring plates are used. It is also possible to form the ring portion 13 in which the heat radiating concave portions 27 and 37 and the heat radiating convex portions 28 and 38 are alternately arranged in the axial direction.

  In each of the above embodiments, the stator core 11 is formed by dividing the ring portions 13 and 60 and the tooth portion 14, but the stator portion 11 may be integrated with the ring portion 13 and the tooth portion 14. In this case, the stator core 11 is formed by stacking a core plate in which the first ring plate 21, the second ring plate 31, and the ring plate 61 and the tooth piece 41 are integrated.

  In each of the above embodiments, the stator core 11 is formed by laminating the first ring plate 21, the second ring plate 31, and the ring plate 61, but is not limited thereto. The stator core 11 may be formed by compression molding magnetic metal powder.

  In the second embodiment, the stator core 11 is formed by alternately stacking the ring plates 61. However, the ring plate 61 is not laminated alternately on the front and back sides, but the ring plate 61 in which the heat radiating portion 66 is formed on the entire outer peripheral surface of the ring plate 61 is used, and the heat radiating recess 67 and the heat radiating convex 68 are axially arranged. The circumferential positions may be shifted relative to each other so as to be alternately arranged. In this case, it is more preferable to use a ring plate 61 having a configuration in which no protruding piece 63 is formed on the inside. Further, the core plate in which the ring plate 61 and the teeth piece 41 are integrated may be laminated with their circumferential positions relatively shifted. Even if comprised in this way, the stator core which can raise heat dissipation efficiency can be formed easily.

  In each of the above embodiments, the rotor core 51 is inserted with the permanent magnet 52 having an arc shape curved in the opposite direction with respect to the outer peripheral surface of the rotor core 51, but this is not limitative. For example, the plate-like permanent magnet 52 may be arranged in a V shape or an I shape when viewed from the axial direction of the rotor core 51.

  In each of the above embodiments, the stator core 11 is provided in the motor 1 that is a magnet-embedded motor. However, the stator core 11 may be provided in a rotating electrical machine such as a surface magnet motor, a reluctance motor, or an induction machine. Good.

The technical idea that can be grasped from each of the above embodiments will be described below.
(A) In the rotating electrical machine according to claim 7, the stator core has a plurality of heat dissipation portions and heat dissipation protrusions alternately formed along the circumferential direction and stacked in the axial direction. A rotating electrical machine comprising a single core plate.

  (B) In the rotating electrical machine according to (A), the stator core has a circumferential position so that the heat radiation recesses and the heat radiation projections are alternately arranged along the axial direction on the outer peripheral surface of the stator core. A rotating electrical machine comprising a plurality of the core plates stacked with the relative displacements of the core plates.

  (C) In the rotating electrical machine according to (a), the stator core includes a plurality of two types of the core plates that are alternately stacked in the axial direction, and the two types of the core plates are outer peripheral surfaces of the stator core. The heat radiating recesses and the heat radiating convex portions are provided with the heat radiating portions formed at positions relatively displaced along the circumferential direction so that the heat radiating convex portions are alternately arranged along the axial direction. Rotating electric machine.

  (D) In the rotating electrical machine according to (A), the stator core includes a plurality of one type of the core plates that are alternately stacked on the front and back sides, and the core plate is disposed on the outer peripheral surface of the stator core with the heat dissipation recess. The heat dissipating part formed so that the circumferential position of the heat dissipating part is shifted between the core plate facing forward and the core plate facing back so that the heat dissipating convex parts are alternately arranged along the axial direction. A rotating electric machine comprising:

  (E) The rotating electrical machine according to any one of claims 7 and (a) to (d), wherein the stator core includes a plurality of teeth portions arranged radially and wound with the windings. A substantially cylindrical ring portion that fixes the teeth portion on the radially outer side, and on the outer peripheral surface of the ring portion, the heat radiation recesses and the heat radiation projections alternately arranged along the axial direction, A rotating electric machine comprising:

Sectional drawing of an inner rotor type motor. (A) is a top view of a stator core and a rotor, (b) is the elements on larger scale of a stator core. (A) is a perspective view which shows the 1st ring plate and 2nd ring plate of 1st Embodiment, (b) is the elements on larger scale of the 1st ring plate and 2nd ring plate of 1st Embodiment. (A) is a perspective view which shows a stator core, (b) is an enlarged view of a stator core. (A) is a perspective view which shows the ring plate of 2nd Embodiment, (b) is the elements on larger scale of the ring plate of 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Motor as a rotary electric machine, 11 ... Stator core, 11a ... Outer peripheral surface of stator core, 12 ... Winding, 13 ... Ring part, 13a ... Outer peripheral surface of ring part, 14 ... Teeth part, 21 ... First constituting the core plate 1 is a ring plate, 26 is a first heat radiating portion as a heat radiating portion, 27 is a first heat radiating concave portion as a heat radiating concave portion, 28 is a first heat radiating convex portion as a heat radiating convex portion, and 31 is a core plate. 2nd ring plate 36 ... 2nd thermal radiation part as a thermal radiation part, 37 ... 2nd thermal radiation recessed part as a thermal radiation recessed part, 38 ... 2nd thermal radiation convex part as a thermal radiation convex part, 41 ... It comprises a core plate Teeth piece 60a, outer peripheral surface of the ring portion serving as the outer peripheral surface of the stator core, 61 ... ring plate constituting the core plate, 66 ... heat radiating portion, 67 ... heat radiating recess, 68 ... heat radiating convex portion.

Claims (7)

A substantially cylindrical stator core provided in an inner rotor type rotating electrical machine and wound with windings,
The stator core is characterized in that the outer peripheral surface of the stator core is provided with heat radiation concave portions and heat radiation convex portions alternately arranged along the axial direction. The stator core according to claim 1, wherein
A stator core, comprising: a plurality of core plates stacked in an axial direction, each having a heat radiating portion in which the heat radiating concave portion and the heat radiating convex portion are alternately formed along a circumferential direction. The stator core according to claim 2,
A plurality of the core plates that are laminated with their circumferential positions relatively shifted so that the heat radiation concave portions and the heat radiation convex portions are alternately arranged along the axial direction on the outer peripheral surface of the stator core; A stator core characterized in that The stator core according to claim 2,
A plurality of the two types of core plates stacked alternately in the axial direction are provided,
The two types of core plates are formed at positions that are relatively shifted along the circumferential direction so that the heat radiating concave portions and the heat radiating convex portions are alternately arranged along the axial direction on the outer peripheral surface of the stator core. A stator core comprising the heat radiating portion. The stator core according to claim 2,
A plurality of one type of the core plate laminated alternately on the front and back sides,
The core plate is configured such that the heat radiating recesses and the heat radiating convex portions are alternately arranged along the axial direction on the outer peripheral surface of the stator core, and the heat radiating is performed between the core plate facing up and the core plate facing down. A stator core comprising the heat dissipating part formed so that a circumferential position of the part is shifted. The stator core according to any one of claims 1 to 5,
The stator core is composed of a plurality of teeth portions that are radially arranged and wound with the windings, and a substantially cylindrical ring portion that fixes the teeth portions on a radially outer side,
The stator core, wherein the outer peripheral surface of the ring portion is provided with the heat radiating concave portions and the heat radiating convex portions alternately arranged along the axial direction. An inner rotor type rotating electrical machine having a substantially cylindrical stator core around which windings are wound,
The rotating electrical machine is characterized in that the outer peripheral surface of the stator core is provided with heat radiation concave portions and heat radiation convex portions alternately arranged along the axial direction.

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