JP2007221913A - Armature for rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the space factor of a coil in a slot in an armature for a rotary electric machine in which a coil that has a pair of coil sides housed in slots positioned on both sides of one of salient poles formed on an armature core and formed by winding a flat conductor edgewise is wound on a salient pole. <P>SOLUTION: At least a coil winding portion 14a of each salient pole 14 on which a coil 13 is wound is so formed that it has a trapezoidal cross-sectional shape and its width is reduced as it goes towards its end. The coil 13 shaped in a shape adapted to the shape of the coil winding portion 14a is wound on the salient pole 14. The portion of each slot 15 in which coil sides 16 are housed is so formed that its cross-sectional shape corresponds to the overall shape of the coils sides 16 of two coils 13 wound on salient poles 14 adjoining to each other in the direction of the circumference of the armature core 12. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  According to the present invention, a coil having a pair of coil sides respectively accommodated in slots on both sides of a plurality of salient poles provided on an armature core, and a coil formed by winding a flat wire in an edgewise manner, is wound around the salient poles. The present invention relates to an armature for a rotating electric machine.

Such an armature for a rotating electrical machine is known from Patent Document 1, for example.
JP 2003-164085 A

  However, the plurality of salient poles included in the armature core disclosed in Patent Document 1 are formed so as to have parallel side surfaces on both sides along the radius of the armature core, and the armature core has a ring shape. Therefore, the slot between the pair of salient poles adjacent to each other is formed so as to increase as the width along the circumferential direction of the armature core becomes deeper, so that a gap is generated between the coil sides in the slot. In such a case, it cannot be said that the ratio of the area occupied by the rectangular conductor in the slot in the plane orthogonal to the axis of the armature core (space factor) is high. It is desired to increase it further.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an armature for a rotating electrical machine that can increase the space factor of a coil in a slot.

  In order to achieve the above object, an invention according to claim 1 has a pair of coil sides respectively accommodated in slots on both sides of a plurality of salient poles provided in an armature core and winds a rectangular conductor wire edgewise. In the armature for a rotating electrical machine in which a rotating coil is wound around the salient pole, a trapezoidal shape in which a coil winding portion around which at least the coil is wound among the salient poles becomes narrower toward the tip side. A portion of the slot in which the coil side is accommodated, wherein the coil is formed so as to have a transverse cross-sectional shape of the coil, and is shaped around a shape corresponding to the shape of the coil winding portion. Is formed in a shape corresponding to the overall shape of the coil sides of the two coils wound around the salient poles adjacent in the circumferential direction of the armature core.

  According to a second aspect of the invention, in addition to the configuration of the first aspect of the invention, the armature core has split surfaces obtained by dividing the armature core into at least two in the circumferential direction at both circumferential ends. A plurality of core divided bodies formed in a circular arc shape and having at least one salient pole, and all the core divided bodies arranged in a ring shape as a whole while contacting the divided surfaces from both sides. A pair of sandwiching connection plates sandwiched between the two is fastened.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect of the invention, a pair of cores connected to the salient poles between a pair of salient poles adjacent in the circumferential direction of the armature core. A slot wedge having a portion is mounted so as to close the slot, and at least the core portion of the slot wedge is formed of a magnetic material.

  Furthermore, in addition to the structure of the invention according to any one of claims 1 to 3, the invention according to claim 4 is an opposing support plate that is opposed to a pair of coil ends provided in the coil at both ends of the armature core. A bobbin formed of an insulating material having a sandwiching plate portion sandwiched between the coil ends and the opposing support plate portion is fastened to each of the support plates integrally having the portions, and the coil ends and the salient poles. The opposing support plate portion, the sandwiching plate portion, and the coil end are respectively bound together by a binding member.

  According to the invention of claim 1, the slot shape of the armature core corresponds to the overall shape of the coil sides of the two coils wound respectively on the salient poles adjacent in the circumferential direction of the armature core, It is possible to suppress the generation of a gap between the coil sides in the slot, and to increase the space factor of the coil in the slot.

  According to the second aspect of the present invention, at least the coil winding portion of the salient pole has a trapezoidal shape in which the width is narrowed toward the tip side, and the coil corresponds to the shape of the coil winding portion. Therefore, in the shaped coil, the width of the portion located on the outer peripheral side of the armature core is larger than the width of the portion located on the inner peripheral side. For this reason, when a coil is wound around a salient pole adjacent to the salient pole in a state where the coil is wound around one salient pole, if the coil is brought closer to the salient pole side along the radial direction of the armature core, the salient pole is already present. It interferes with the coil wound around. However, by configuring the armature core with a plurality of core divided bodies and a pair of sandwiched connecting plates that sandwich the core divided bodies, it becomes easy to wind the coil around the salient poles of each core divided body. An armature can be configured by combining a plurality of core divided bodies in a state where is wound.

  According to the third aspect of the present invention, the tip of the salient pole cannot be formed into a T shape so that the coil can be wound, but the slot is mounted between the salient poles adjacent to each other. By connecting the core made of magnetic material provided in the wedge to the salient pole, the tip shape of the salient pole can be substantially T-shaped to increase the magnetic efficiency, and the slot ripple is closed by closing the slot with the slot wedge. Can be reduced.

  According to the fourth aspect of the present invention, the counter support plate portion provided in the support plate fastened to the armature core, and the bobbin interposed between the coil end of the coil and the salient pole of the armature core are provided. Since the sandwiching plate portion sandwiched between the coil end and the opposed support plate portion and the coil end are tied together by the binding member, the coil and the bobbin can be securely fixed to the armature core.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.

  1 to 9 show an embodiment of the present invention. FIG. 1 is a front view of a part of a stator as viewed from one axial end side, and FIG. 2 is a sectional view taken along line 2-2 of FIG. 3 is an enlarged sectional view taken along line 3-3 in FIG. 2, FIG. 4 is a front view showing the coil before shaping, FIG. 5 is a sectional view taken along line 5-5 in FIG. 4, and FIG. FIG. 7 is a cross-sectional view for explaining a coil mounting process, FIG. 8 is a perspective view of a slot wedge, and FIG. 9 is a perspective view showing a coil fixing structure in a state where a stator core is omitted except for salient poles. FIG. 10 is an exploded perspective view in a state where the stator core having the structure shown in FIG. 9 is omitted.

  First, in FIG. 1 to FIG. 3, a stator 11 as an armature in a rotating electric machine is formed by attaching coils 13 to a stator core 12 as an armature core, and a plurality of protrusions are formed on the inner periphery of the stator core 12. The poles 14 are provided at equal intervals, and the coils 13 are wound around the salient poles 14, respectively.

  Moreover, the salient pole 14 includes a coil winding part 14a around which the coil 13 is wound, and a wedge mounting part 14b connected to the tip of the coil winding part 14a. At least the coil winding portion 14a of the salient poles 14 is formed to have a trapezoidal cross-sectional shape with a width narrowing toward the tip side. In this embodiment, the wedge mounting portion 14b is formed. Is formed to have a rectangular cross-sectional shape with a constant width along the circumferential direction of the stator core 12.

  4 and 5, the coil 13 is formed by winding a rectangular conductor wire 19 with an insulation coating a plurality of times, for example, six times, and is accommodated in slots 15 and 15 on both sides of the salient pole 14, respectively. Coil sides 16 and 16, a pair of coil ends 17 and 17 extending in parallel with each other in a direction perpendicular to the longitudinal direction of the coil sides 16... And both the coil sides 16. .. Have curved portions 18, 18... Connecting the ends of the coil ends 17. Moreover, since the coil winding portion 14a of the salient pole 14 has a trapezoidal cross-sectional shape, the coil 13 is edgewise so that the distance between the coil sides 16 and 16 becomes wider toward one side in the axial direction. It is wound. Since the inner and outer circumferences of the coil 13 thus formed by winding are concave and convex, the coil 13 is shaped by the shaping means 20 shown in FIG. 6 before being attached to the stator core 12. That is, the shaping means 20 includes a first mold 22 provided with a recess 21 having a tapered inner side surface 21 a and a second mold sandwiching the coil 13 accommodated in the recess 21 with the first mold 22. 23, and by such shaping means 20, the coil 13 has a shape corresponding to the shape of the coil winding portion 14a so that the inner periphery and the outer periphery have a smooth shape without irregularities. It is shaped.

  Moreover, the cross-sectional shape of the portion in which the coil sides 16 and 16 of the shaped coil 13 are accommodated in the slot 15 formed between the two salient poles 14 and 14 adjacent in the circumferential direction of the stator core 12 is the above-described both It is formed in a shape corresponding to the overall shape of the coil sides 16 and 16 of the two coils 13 and 13 wound around the poles 14 and 14, respectively, and has a substantially rectangular cross-sectional shape. The

  Thus, when the shaped coil 13 is wound around the coil winding portion 14a, direct contact with the adjacent coil side 16 in the slot 15 and direct contact of the salient pole 14 to the coil winding portion 14a. In order to avoid contact, insulating paper 24 is wound around the coil sides 16.

  By the way, since the cross-sectional shape of at least the coil winding part 14a of the salient pole 14 is a trapezoid whose width becomes narrower toward the tip side, the coil 13 is also shaped corresponding to the shape of the coil winding part 14a. In the shaped coil 13, the width W1 of the portion located on the outer peripheral side of the stator core 12 is larger than the width W2 of the portion located on the inner peripheral side. For this reason, when the coil 13 is wound around the salient pole 14 adjacent to the salient pole 14 in a state where the shaped coil 13 is wound around one salient pole 14, the coil 13 is projected along the radial direction of the stator core 12. If it approaches the pole 14 side, it will interfere with the coil 13 already wound around the salient pole 14.

  Therefore, as shown in FIG. 7, a plurality of split surfaces 26, 26 obtained by dividing the stator core 12 into at least two in the circumferential direction are formed in a circular arc shape at both ends in the circumferential direction, and have at least one salient pole 14. Are prepared. The core divided body 27 is formed by laminating a plurality of core plates, and the core divided body 27 in this embodiment is formed in an arc shape having three salient poles 14 on the inner peripheral side. Thus, the stator core 12 sandwiches the plurality of core divided bodies 27 and all the core divided bodies 27 arranged in a ring shape as a whole while the divided surfaces 26 and 26 are in contact with each other. The pair of sandwiching connection plates 28 and 28 are configured by fastening with a plurality of bolts 29... And nuts 30.

  The insertion holes 31 through which the bolts 29 are inserted are provided at portions corresponding to the salient poles 14 of the core divided bodies 27, and the arrangement of the insertion holes 31 is set to such a position. As a result, since the base portion of the salient poles 14 is wide, the empty space around the insertion holes 31 can be widened, and the magnetic influence due to the provision of the insertion holes 31 can be reduced.

  When winding the coils 13... Around the core divided body 27, the core divided body 27 shown in FIG. 7A has a salient pole 14 at the center in the circumferential direction, and the coil 13 as shown in FIG. Then, the coil 13 is wound around the salient pole 14 on one end side in the circumferential direction of the core divided body 27 while being inclined, and further, as shown in FIG. The coil 13 is wound around the end salient pole 14 while being inclined.

  In this way, the sandwiched connecting plates of the core divided bodies 27 in a state where the coils 13 are wound around the salient poles 14 are brought into contact with the divided surfaces 26, 26,. The stator core 12 is configured by being clamped by 28...

  By the way, fitting grooves 32 and 32 extending in the axial direction of the stator core 12 are provided on the front end portion of the salient pole 14, that is, on both side surfaces of the wedge mounting portion 14b. Further, the slot wedges 33 are fitted into the fitting grooves 32 of the salient poles 14 so as to close the slots 15 from the radially inner side of the stator core 12 and to contact the coil sides 16 of the slots 15. . As a result, the coil sides 16 are sandwiched between the closed end of the slot 15 and the slot wedge 33 in the slot 15, and the coil sides 16 are fixed in the slot 15.

  Referring also to FIG. 8, the slot wedge 33 is formed by integrally connecting a pair of core portions 34, 34 connected to the wedge mounting portion 14 b of the salient pole 14 by a resin mold portion 35. The core portions 34 are formed of a magnetic material, for example, by pressing magnetic powder. Further, from both the core portions 34, fitting protrusions 34a fitted into the fitting grooves 32 are integrally projected.

  The core portion 34 has a shape that constitutes a tooth in cooperation with the wedge mounting 14b, and is formed such that the width along the radial direction of the stator core 12 decreases as the distance from the salient pole 14 increases. .

  Referring to FIGS. 9 and 10 together, both ends of the stator core 12 are integrally supported on the inner peripheral side with opposing support plate portions 37a opposed to the coil ends 17 of the coils 13. Plates 37 are brought into contact with each other and bolts 29 inserted into the stator core 12 and the two support plates 37 from the other axial end of the stator core 12 at a plurality of positions spaced in the circumferential direction. The two support plates 37 are fastened to both ends of the stator core 12 by screwing and tightening the nuts 30.

  The support plate 37 at a portion corresponding to each of the bolts 29 has a concave portion 38 that is open outwardly along the radial direction of the stator core 12 and a square that protrudes outward from the central portion of the concave portion 38. The projections 39 are shaped, and the insertion holes 40 through which the bolts 29 are inserted are provided in the support plate 37 so that substantially half of the insertion holes 40 are arranged in the projections 39. In addition, the pair of outer end corners provided in the protrusions 39 are bent in advance, and in a state where the nuts 30 are screwed and tightened to the bolts 29 inserted through the insertion holes 40, as shown in FIG. As described above, both the outer end corners of the protrusions 39 are further bent so as to form restriction bending portions 39a and 39a that are close to and opposed to the heads of the nuts 30 and the bolts 29. As a result, the heads of the nuts 30 and the bolts 29 are wrapped by the restricting bent portions 39a, 39a, and thereby the bolts 29 and the nuts 30 are prevented from loosening.

  Further, between the coil ends 17 of the coils 13 wound around the salient poles 14 and between the salient poles 14, bobbins 41 made of an insulating material such as a synthetic resin are respectively interposed. The bobbins 41 are integrally formed with coil ends 17 and sandwiching plate portions 41a sandwiched between the opposing support plate portions 37a. In addition, the opposing support plate portions 37a ... and the sandwiching plate portions 41a ... are provided with openings 42 ..., 43 ... formed in a rectangular shape, for example, and the bobbins 41 ... A pair of wall portions 41b, 41b forming grooves 44 communicating with the openings 42, 43,... Are protruded so as to contact the inner periphery of the coil ends 17.

  Thus, the opposing support plate portion 37a, the clamping plate portion 41a, and the coil end 17 are tied together with a fastener 45 or a thread as a binding member that passes through the openings 42, 43 and the groove 44.

  Next, the operation of this embodiment will be described. Of the salient poles 14 provided on the stator core 12, a coil winding portion 14a around which at least the coil 13 is wound has a trapezoidal shape with a width narrowing toward the tip side. The coil 13 formed to have a surface shape and shaped into a shape corresponding to the shape of the coil winding portion 14 a is wound around the salient pole 14, and the coil side 16 of the coil 13 in the slot 15 is formed. The cross-sectional shape of the portion to be accommodated is formed into a shape corresponding to the overall shape of the coil sides 16 and 16 of the two coils 13 and 13 respectively wound around the salient poles 14 and 14 adjacent in the circumferential direction of the stator core 12. Therefore, it is possible to suppress the generation of a gap between the coil sides 16 and 16 in the slot 15 and increase the space factor of the coil 13 in the slot 15.

  In addition, the stator core 12 has a plurality of core division bodies 27 formed in an arc shape having division surfaces 26, 26 obtained by dividing the stator core 12 into at least two in the circumferential direction at both ends in the circumferential direction, 26 are mutually abutted, and a pair of sandwiching connection plates 28 and 28 sandwiching all the core divided bodies 27 arranged in a ring shape as a whole from both sides are fastened. It becomes easy to wind the coils 13 around the salient poles 14 of the bodies 27, and the stator 11 can be configured by combining a plurality of core divided bodies 27 with the coils 13 wound. it can.

  Moreover, a slot wedge 33 having a pair of core portions 34 connected to the salient poles 14, 14 adjacent to each other in the circumferential direction of the stator core 12 is mounted so as to close the slot 15. Since the core portion 34 of the slot wedge 33 is formed of a magnetic material, the tip shape of the salient pole 14 cannot be formed into a T shape in order to allow the coil 13 to be wound. By connecting the core portion 34 made of a magnetic material included in the slot wedge 33 to the salient pole 14, the tip shape of the salient pole 14 can be substantially T-shaped, and the magnetic efficiency can be increased. By closing at 33, slot ripple can be reduced.

  Further, a support plate 37 integrally having opposing support plate portions 37a respectively opposed to both coil ends 17 of the coil 13 is fastened to both ends of the stator core 12, and between the coil ends 17 and the counter support plate portions 37a. Bobbins 41 having a sandwiching plate portion 41a sandwiched between them and formed of an insulating material are interposed between the coil ends 17 and the salient poles 14, respectively, and the opposing support plate portion 37a and the sandwiching plate portion 41a. Since the coil end 17 is tied together by the fastener 45, the coil 13 and the bobbin 41 can be securely fixed to the stator core 12.

  FIG. 11 shows a first modification of the slot wedge. The slot wedge 47 is formed by, for example, magnetic powder pressure molding, and the wedge mounting portion 14b of the salient pole 14 (see the first embodiment). ) And a connecting portion 47b for connecting the core portions 47a, 47a, and the fitting groove 32 of the wedge mounting portion 14b (see the first embodiment). As a matter of course, it is integrally provided with fitting protrusions 47c and 47c protruding from the core portions 47a. The core portion 47a has a shape that forms a tooth with the pair of core portions 47a connected to the wedge mounting portion 14b of the salient pole 14 and the salient pole 14, and as the distance from the salient pole 14 increases. The width along the radial direction of the stator core 12 is formed to be thin, and the connecting portion 47b is formed so that a groove 48 facing the coil 13 in the slot 15 is formed between the core portions 47a. It is formed with a width narrower than 47a.

  FIG. 12 shows a second modification of the slot wedge. The slot wedge 49 is formed by, for example, pressure-molding magnetic powder, and the wedge mounting portion 14b of the salient pole 14 (see the first embodiment). ) And a connecting portion 49c for connecting the core portions 49a and 49b, and the fitting groove 32 of the wedge mounting portion 14b (see the first embodiment). As a matter of course, it is integrally provided with fitting protrusions 49d and 49d protruding from the core parts 49a and 49b, respectively. The core portions 49a and 49b are formed so as to constitute a tooth together with the wedge mounting portion 14b of the salient pole 14, and the connecting portion 49c is a coil in the slot 15 between the core portions 49a and 49b. 13, and the groove 50 extends in the width direction of the slot wedge 49 from one to the other along the longitudinal direction of the slot wedge 49 (the axial direction of the stator core 12). (Circumferential direction of the stator core 12) It is formed to be inclined so as to change its position from one side to the other side. This exhibits an effect equivalent to the skew of the teeth, and can reduce the cogging torque.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. It is.

  For example, in the above-described embodiment, only the coil winding portion 14a of the salient pole 14 is formed to have a trapezoidal cross-sectional shape whose width is narrowed toward the tip side. You may form so that it may have the trapezoid cross-sectional shape which became narrow as it went to.

It is the front view which looked at a part of stator from the axial direction one end side. FIG. 2 is a sectional view taken along line 2-2 of FIG. FIG. 3 is an enlarged sectional view taken along line 3-3 in FIG. 2. It is a front view which shows the coil before shaping. FIG. 5 is a sectional view taken along line 5-5 of FIG. It is a cross-sectional view which shows the shaping state of a coil. It is a cross-sectional view for demonstrating the mounting process of a coil. It is a perspective view of a slot wedge. It is a perspective view which shows the fixation structure of a coil in the state which abbreviate | omitted the stator core in the part except a salient pole. FIG. 10 is an exploded perspective view in a state where a stator core having the structure shown in FIG. 9 is omitted. It is a perspective view which shows the 1st modification of a slot wedge. It is a perspective view which shows the 2nd modification of a slot wedge.

Explanation of symbols

12 ... Stator core 13 which is an armature core ... Coil 14 ... Salient pole 14a ... Coil winding part 15 ... Slot 16 ... Coil side 19 ... Flat wire 26 ... Dividing surface 27 ... core divided body 28 ... clamping connecting plates 33, 47, 49 ... slot wedges 34, 47a, 49a, 49b ... core portion 37 ... support plate 37a ... opposed support Plate part 41... Bobbin 41 a... Clamping plate part 45.

Claims (4)

  A pair of coil sides (16) respectively accommodated in slots (15) on both sides of a plurality of salient poles (14) provided on the armature core (12), and a rectangular conducting wire (19) is wound edgewise. In the armature for a rotating electrical machine in which the coil (13) is wound around the salient pole (14), the coil winding portion (14a) around which at least the coil (13) is wound out of the salient pole (14). ) Is formed so as to have a trapezoidal cross-sectional shape with a narrower width toward the tip side, and the coil (13) shaped into a shape corresponding to the shape of the coil winding portion (14a) is formed. A salient pole wound around the salient pole (14) and having a cross-sectional shape of a portion of the slot (15) in which the coil side (16) is accommodated is adjacent in the circumferential direction of the armature core (12) (14) each wound One of the rotary electric machine armature, characterized in that it is formed in a shape corresponding to the overall shape of the coil (13) coil sides (16).   The armature core (12) has a split surface (26) obtained by dividing the armature core (12) into at least two parts in the circumferential direction at both ends in the circumferential direction and is formed in an arc shape and at least one of the above-described armature cores (12). A plurality of core divided bodies (27) having salient poles (14) and all the core divided bodies (27) arranged in a ring shape as a whole while contacting the divided surfaces (26) from both sides. The armature for a rotating electrical machine according to claim 1, wherein a pair of sandwiching connecting plates (28) sandwiched are fastened.   A slot having a pair of core portions (34; 47a; 49a, 49b) connected to the salient poles (14) between a pair of salient poles (14) adjacent to each other in the circumferential direction of the armature core (12). A wedge (33, 47, 49) is mounted so as to close the slot (15), and at least the core portion (34; 47a; 49a, 49b) of the slot wedge (33, 47, 49) is made of a magnetic material. The armature for a rotating electrical machine according to claim 1 or 2, wherein the armature is formed.   Support plates (37) integrally having opposing support plate portions (37a) respectively opposed to the coil ends (17) are fastened to both ends of the armature core (12), and the coil (13) is provided. A bobbin (41) formed of an insulating material having a pair of coil ends (17) and a sandwiching plate portion (41a) sandwiched between the opposing support plate portions (37a) includes the coil ends (17) and It is interposed between the salient poles (14), respectively, and the opposing support plate portion (37a), the sandwiching plate portion (41a) and the coil end (17) are tied together by a binding member (45). The armature for rotary electric machines according to any one of claims 1 to 3.

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