JP2016073120A - Stator for rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator for rotary electric machine which easily appropriately keeps electrical insulation between a fastening member for fixture that is inserted into an insertion hole for fixture, and a coil.SOLUTION: A core 20 includes insertion holes 4 for fixture into which fastening members for fixture for fixing the core 20 to another member in an axial direction at a plurality of positions in a circumferential direction C. A crossover part 50 includes a circumferential extension part 51 which extends in the circumferential direction C in a specific radial region that is a region in a radial direction R set for each phase. A coil 3 is wound around the core 20 in such a manner that a plurality of circumferential extension parts 51 of the same phase are arranged side by side while being spaced apart from each other by gaps 52 in the circumferential direction C in the outermost specific radial region in the radial direction R. Each of all the insertion holes 4 for fixture is formed at a position in the circumferential direction C corresponding to any one of a plurality of gaps 52.SELECTED DRAWING: Figure 2

Description

  The present invention includes a core in which a plurality of slots extending in the axial direction and in the radial direction and having openings on both sides in the axial direction and inside in the radial direction are distributed in the circumferential direction, and a coil side portion disposed in the slot. Further, the present invention relates to a stator for a rotating electrical machine including a plurality of coils wound around a core having a transition portion that connects a pair of coil sides to the core on the outer side in the axial direction.

  As a stator for a rotating electrical machine as described above, one described in Japanese Patent Application Laid-Open No. 2007-74773 (Patent Document 1) is known. In Patent Document 1, as shown in FIG. 1 of the document, a circumferentially extending portion in which a coil transition portion extends in the circumferential direction in a specific radial region that is a radial region set for each phase. A configuration having And in the structure of patent document 1, as shown in FIG. 7 of the said document, the circumferential direction extension part of the transition part of the phase in which a specific radial direction area | region is set to the outermost side of radial direction is the said transition part. The pair of coil sides to be connected are arranged offset to the outside in the radial direction. Although not described in Patent Document 1, according to such an arrangement configuration, there is a possibility that the coil end portion can be downsized in the axial direction.

JP 2007-74773 A

  By the way, the stator core is generally provided with a fixing insertion hole through which a fixing fastening member for fixing the core to another member is inserted in a radially outer side than the slot. In the example of Patent Document 1, as shown in FIG. 2 of the document, the fixing insertion hole is provided so as to protrude outward in the radial direction with respect to the cylindrical outer peripheral surface of the core over the entire axial direction. It is formed in the projected ridge. Since such a fixing insertion hole is provided in the core of the stator, in the configuration in which the circumferentially extending portion of the crossing portion is offset and disposed radially outward as described above, the circumferentially extending portion and the fixed portion are fixed. When the distance to the insertion hole is shortened, it may be difficult to ensure electrical insulation between the fixing fastening member inserted into the fixing insertion hole and the coil. However, although Patent Document 1 describes a technique for ensuring electrical insulation between different-phase coils in the coil end portion, it refers to electrical insulation between the fastening member for fixing and the coil. There is no description.

  Therefore, it is desired to realize a stator for a rotating electrical machine that can easily ensure appropriate electrical insulation between the fixing fastening member inserted through the fixing insertion hole and the coil.

  In view of the above, a plurality of slots extending in the axial direction and the radial direction and having openings on both sides in the axial direction and on the inner side in the radial direction are disposed in the slot. And a plurality of coils wound around the core having a connecting portion for connecting the coil side portions and the pair of coil side portions to the core on the outer side in the axial direction. The stator is characterized in that the core includes fixing insertion holes through which the fixing fastening members for fixing the core to other members are inserted in the axial direction at a plurality of locations in the circumferential direction. The crossover has a circumferentially extending portion extending in the circumferential direction in the specific radial region that is the radial region set for each phase, and the coil is the outermost specific portion in the radial direction. In the radial region, multiple in-phase The circumferentially extending portions are wound around the core so as to be arranged with a gap along the circumferential direction, and each of the fixing insertion holes corresponds to one of the plurality of gaps. It is in the point formed in the position of the circumferential direction.

  According to the above characteristic configuration, the coil is wound around the core so that a plurality of in-phase circumferentially extending portions are arranged at intervals along the circumferential direction in the radially outermost specific radial region, A fixing insertion hole is formed at a circumferential position corresponding to the gap. Therefore, it is possible to ensure a radial distance between the fixing insertion hole and the outer peripheral surface of the coil end portion as compared with the case where the fixing insertion hole is formed at a circumferential position that does not correspond to the gap. As a result, it is easy to appropriately secure an insulation distance between the fixing fastening member inserted through the fixing insertion hole and the coil end portion. And according to said characteristic structure, since each of all the fixing penetration holes is formed in the position of the circumferential direction corresponding to either of the said some clearance gap, said insulation distance about all the fixing insertion holes It is easy to ensure the appropriateness. As a result, it is possible to realize a stator for a rotating electrical machine in which it is easy to appropriately ensure the electrical insulation between the fixing fastening member inserted through the fixing insertion hole and the coil.

It is an axial view of a stator according to an embodiment of the present invention. It is a figure which shows typically the arrangement structure to the core of the coil of each phase which concerns on embodiment of this invention. It is III-III sectional drawing in FIG. It is IV-IV sectional drawing in FIG. It is a figure which shows typically the pressure molding process of the coil end part which concerns on embodiment of this invention. It is VI-VI sectional drawing in FIG.

  Embodiments of a stator for a rotating electrical machine according to the present invention will be described with reference to the drawings. In the following description, unless otherwise specified, the “axial direction L”, “circumferential direction C”, and “radial direction R” are the axis A of the core 20 of the stator 1 (see FIG. 1). Is defined as a standard. The axis A is the axis of the cylindrical inner peripheral surface 21 of the core 20, and is also the axis of a cylindrical portion (a portion excluding the protruding portion 5 described later) on the outer peripheral surface 22 of the core 20. In the present specification, terms (eg, parallel, etc.) relating to dimensions, arrangement direction, arrangement position, and the like are used as a concept including a state having a difference due to an error (an error that is acceptable in manufacturing). The “rotary electric machine” is used as a concept including a motor (electric motor), a generator (generator), and a motor / generator that performs both functions of the motor and the generator as necessary.

  The stator 1 is a stator for a rotating electrical machine, and includes a core 20 (stator core) and a multi-phase coil 3 wound around the core 20 as shown in FIGS. The core 20 is configured using a magnetic material. For example, a core 20 is formed by laminating a plurality of magnetic plates (for example, electromagnetic steel plates such as silicon steel plates), or a compact material formed by pressing a magnetic material powder is a main component. As a result, the core 20 is formed. In this embodiment, the stator 1 is used for a rotating electrical machine driven by a three-phase alternating current, and the coil 3 includes three phase coils of a U-phase coil 3U, a V-phase coil 3V, and a W-phase coil 3W. Yes. The stator 1 is a stator for a rotating field type rotating electrical machine, and functions as an armature. A magnetic field generated from the stator 1 rotates a rotor (not shown) as a field provided with a permanent magnet, an electromagnet, or the like. The rotor is disposed inside the radial direction R with respect to the core 20.

  In the core 20, a plurality of slots 40 extending in the axial direction L and the radial direction R are distributed in the circumferential direction C. Each of the slots 40 has openings on both sides in the axial direction L and on the inner side in the radial direction R. The plurality of slots 40 are arranged at regular intervals along the circumferential direction C. In the present embodiment, the U-phase slot 40, the V-phase slot 40, and the W-phase slot 40 are arranged so as to repeatedly appear in the circumferential direction C. In the present embodiment, the number of slots per phase per pole is “2”, and the core 20 is arranged so that two slots 40 for each phase repeatedly appear along the circumferential direction C. In this embodiment, the number of magnetic poles per phase is “16” (the number of magnetic pole pairs is “8”), and 96 (= 2 × 16 × 3) slots 40 in total are arranged in the core 20. ing. A tooth 23 is formed between two slots 40 adjacent to each other in the circumferential direction C. The inner peripheral surface 21 of the core 20 is a cylindrical virtual surface including the inner end surfaces in the radial direction R of the plurality of teeth 23.

  As shown in FIG. 1, the core 20 includes fixing insertion holes 4 that penetrate the core 20 in the axial direction L at a plurality of locations in the circumferential direction C (four locations in this example). The plurality of fixing insertion holes 4 are provided at equal intervals along the circumferential direction C. As shown in FIG. 4, a fixing fastening member 6 for fixing the core 20 to the case 2 (an example of “another member” to which the core 20 is fixed) is provided in the fixing insertion hole 4 in the axial direction L. Is inserted. In FIG. 4, the fixing fastening member 6 and the case 2 not shown in FIG. 1 are shown to facilitate understanding of the invention. In the present embodiment, the fixing insertion hole 4 is a through hole that penetrates the core 20 in the axial direction L, and is formed to extend in parallel to the axial direction L. Moreover, in this embodiment, the fastening member 6 for fixation is a fastening bolt, and the case 2 is provided with a fastening hole 7 in which a female screw for fastening the fastening bolt is formed.

  The fixing insertion hole 4 is formed at a position having little influence on the magnetic circuit. Specifically, the fixing insertion hole 4 is formed outside the outermost portion 43 in the radial direction R of the slot 40 in the radial direction R. In the present embodiment, the core 20 includes a protruding portion 5 that protrudes outward in the radial direction R with respect to a cylindrical portion (cylindrical outer peripheral surface portion) of the outer peripheral surface 22. In the present example, the protruding portion 5 is formed integrally with a portion (core main body portion) constituting the cylindrical outer peripheral surface portion of the core 20. Moreover, in this example, the protrusion part 5 is formed over the whole area of the axial direction L of the core 20 (core main-body part). A fixing insertion hole 4 is formed so as to penetrate the protruding portion 5 in the axial direction L. In this example, the core 20 includes protrusions 5 at four locations in the circumferential direction C, and the fixing insertion holes 4 are formed in each of the protrusions 5. As shown in FIG. 4, the core 20 is formed in the case 2 by the fixing fastening member 6 inserted into the fixing insertion hole 4 in a state where the end face in the axial direction L of the protruding portion 5 is in contact with the seat surface of the case 2. Fastened and fixed to. The seat surface of the case 2 is formed by an end surface in the axial direction L of the seat portion provided with the fastening hole 7. Although a detailed description is omitted, portions other than the seat portion in the case 2 are spaced apart so as not to contact the core 20.

  The coil 3 is configured using a linear conductor that is a linear conductor. The linear conductor is made of a conductive material such as copper or aluminum, and an insulating film made of an electrically insulating material such as resin is formed on the surface of the linear conductor. As shown in FIGS. 2 and 3, the coil 3 includes a coil side portion 30 disposed in the slot 40 and a crossover portion 50 that connects the pair of coil side portions 30 to the core 20 on the outer side in the axial direction L. And have. As shown in FIG. 3, the coil side portion 30 is disposed so as to extend in the slot 40 in parallel with the axial direction L. A plurality of coil side portions 30 are arranged inside one slot 40, but only one coil side portion 30 is representatively shown in FIG.

  The crossover portions 50 are provided on both sides in the axial direction L with respect to the core 20. As shown in FIG. 2, each of the crossover portions 50 connects a pair of coil side portions 30 respectively arranged in different slots 40 (in this example, a pair of slots 40 separated from each other by 5 times the slot pitch). To do. A coil end portion 70, which is a portion of the coil 3 protruding in the axial direction L from the core 20, is formed by the assembly of the transition portions 50 of each phase. In FIG. 2, in order to facilitate understanding of the arrangement configuration of the coils 3 of the respective phases to the core 20, the positional relationship in the radial direction R with respect to the core 20 of the crossover portion 50 is not shown strictly, and the pair of slots 40 are provided. One connecting line segment collectively represents a plurality of bridging portions 50 connecting the pair of coil side portions 30 respectively disposed in the pair of slots 40. Further, in FIG. 3, the shape of each of the crossover portions 50 is not shown, but the outer shape of the aggregate of a plurality of crossover portions 50 in the same phase is shown. In FIG. 4 referred later, the shape of the assembly of the transition portions 50 for each phase is not shown, but the overall outer shape of the coil end portion 70 is shown.

  As shown in FIG. 3, the crossover portion 50 includes a circumferentially extending portion 51 that extends in the circumferential direction C in a specific radial direction region D that is a region in the radial direction R set for each phase. Here, with respect to the shape of the circumferentially extending portion 51, “extends in the circumferential direction C” means that the whole or a part of the extending direction of the circumferentially extending portion 51 is inclined with respect to the circumferential direction C. The inclination angle with respect to the circumferential direction C of the extending direction of the circumferential extending portion 51 as a whole (direction in which the sum as a vector for the extending direction of each portion faces) is within a predetermined range (for example, 10). It is used as a concept including a shape that is less than or equal to 20 degrees or less.

  The plurality of specific radial regions D corresponding to the plurality of phases are set in different regions in the radial direction R so as to be arranged in order along the radial direction R. The two specific radial direction regions D adjacent to the radial direction R are set so as to partially overlap each other, or are set continuously or with a discontinuous portion interposed therebetween so as not to overlap each other. In the present embodiment, as shown in FIG. 3, the specific radial direction region D is set for each of the three phases of the U phase, the V phase, and the W phase. In this embodiment, the phase in which the specific radial region D is set to the outermost side in the radial direction R is the U phase, and the phase in which the specific radial direction region D is set to the innermost side in the radial direction R is the W phase. It is. Since the specific radial direction region D of each phase is set in this way, the outer peripheral surface 71 of the coil end portion 70 is determined according to the position of the outer peripheral surface of the assembly of the U-phase transition portions 50, and the coil end portion 70. The inner circumferential surface is determined according to the position of the inner circumferential surface of the assembly of the W-phase transition portions 50.

  As shown in FIGS. 2 and 3, the coil 3 has the same phase (U phase in this example) in the outermost specific radial direction region D (in this example, the U phase specific radial direction region D) in the radial direction R. The plurality of circumferentially extending portions 51 are wound around the core 20 so as to line up with a gap 52 along the circumferential direction C. In this example, in the coil 3, in addition to the outermost specific radial direction region D in the radial direction R, in the other specific radial direction region D, a plurality of circumferentially extending portions 51 having the same phase extend along the circumferential direction C. Are wound around the core 20 so as to line up with a gap. For example, by winding each phase coil around the core 20 for each phase in the order of the U-phase coil 3U, the V-phase coil 3V, and the W-phase coil 3W, the coil 3 is cored in a manner as shown in FIG. 20 can be wound.

  In the present embodiment, the coil 3 includes a plurality of concentric winding portions 10. The concentric winding portion 10 is a coil portion (overlapping winding portion) formed by winding a linear conductor a plurality of times between a pair of slots 40 (between a pair of slots 40 separated from each other by 5 times the slot pitch in this example). is there. As shown in FIG. 2, the coil 3 of each phase of the U-phase coil 3 </ b> U, the V-phase coil 3 </ b> V, and the W-phase coil 3 </ b> W has a concentric winding portion 10 whose winding directions are opposite to each other along the circumferential direction C. One is alternately provided for each magnetic pole pitch (in this example, six times the slot pitch). That is, the several concentric winding part 10 with which one phase coil is provided is arranged side by side in the circumferential direction C so that the arrangement | positioning area | region of the circumferential direction C may not mutually overlap. The concentric winding portions 10 whose winding directions are opposite to each other form magnetic poles that are opposite to each other when the coil 3 is energized. The coil 3 of each phase is configured by connecting a plurality of concentric winding portions 10 in series or in parallel to each other. However, in FIG. 2, illustration of connection wires connecting the concentric winding portions 10 to each other is omitted.

  As described above, since the plurality of concentric winding portions 10 included in one phase coil are arranged side by side in the circumferential direction C so that arrangement regions in the circumferential direction C do not overlap each other, the U-phase adjacent to the circumferential direction C The gap 52 is formed between each of the two concentric winding portions 10. That is, the same number (16 in this example) of gaps 52 as the number of magnetic poles per phase are formed in the U-phase coil 3U. Similarly, the same number of gaps as the number of magnetic poles per phase are formed in the V-phase coil 3V and the W-phase coil 3W. As shown in FIG. 2, all of the fixing insertion holes 4 are formed at positions in the circumferential direction C corresponding to any of the plurality of gaps 52 in the U-phase coil 3 </ b> U. Each of the fixing insertion holes 4 is formed outside the corresponding gap 52 in the radial direction R. In the present embodiment, each of the fixing insertion holes 4 is formed such that the center in the circumferential direction C of the hole coincides with the center in the circumferential direction C of the corresponding gap 52. Here, the teeth 23 in which the central portion of the circumferential direction C is not included in the circumferential direction C arrangement region of any circumferentially extending portion 51 of the U phase (that is, any circumferentially extending portion 51 of the U phase is also included). When the teeth 23) that do not straddle are set as the target teeth 23a, gaps 52 are formed corresponding to the respective target teeth 23a. Therefore, it can be said that each of all the fixing insertion holes 4 is formed at a position in the circumferential direction C corresponding to one of the plurality of target teeth 23a. As described above, in the present embodiment, the plurality of fixing insertion holes 4 are provided along the circumferential direction C at equal intervals. The gaps 52 are formed in the same number as the number of magnetic poles per phase. Therefore, the number of the fixing through holes 4 provided in the core 20 is set to one of the divisors of the number of magnetic poles per phase, and in this embodiment, “4” which is one of the divisors of “16”. "Is set.

  As shown in FIG. 1, in the present embodiment, the shape of the outer peripheral surface 71 of the coil end portion 70 in the axial direction L is a circle concentric with the axis A except for the formation position of the recess 72 described later. It is formed. That is, the arrangement reference surface S that serves as a reference for the arrangement of the outer peripheral surface 71 of the coil end portion 70 is a cylindrical surface that is concentric with the axis A of the core 20. In the present embodiment, as shown in FIG. 2, the arrangement reference surface S is a cylindrical surface arranged outside the outermost portion 43 (bottom portion) in the radial direction R of the slot 40 in the radial direction R. Yes. As a result, compared with the case where the arrangement reference surface S is a cylindrical surface arranged inside the outermost portion 43 in the radial direction R, the arrangement region in the radial direction R of the coil end portion 70 can be secured widely. Accordingly, it is possible to reduce the arrangement region of the coil end portion 70 in the axial direction L and to reduce the size of the coil end portion 70 in the axial direction L. As a result of the arrangement reference plane S being arranged outside the outermost portion 43 of the slot 40 in the radial direction R, the outermost portion 43 of the slot 40 is located in the U-phase specific radial region D as shown in FIG. The area | region arrange | positioned outside radial direction R rather than is included. That is, the circumferentially extending portion 51 of the U-phase transition portion 50 is basically arranged offset to the outside in the radial direction R with respect to the pair of coil side portions 30 to which the transition portion 50 is connected.

  As described above, in the present embodiment, since the arrangement reference surface S is a cylindrical surface arranged outside the outermost portion 43 of the slot 40 in the radial direction R, the arrangement reference surface S is the outermost portion of the slot 40. Compared to the case where the cylindrical surface is disposed on the inner side in the radial direction R than 43, the radial direction between the outer peripheral surface 71 of the coil end portion 70 and the fixing fastening member 6 inserted through the fixing insertion hole 4. R distance tends to be short. In view of this point, in the present embodiment, as shown in FIGS. 1 and 4, a plurality of concave portions 72 recessed inward in the radial direction R from the arrangement reference surface S are provided on the outer peripheral surface 71 of the coil end portion 70. Are formed at positions in the circumferential direction C corresponding to the fixing insertion holes 4. The recess 72 is formed over the entire region in the axial direction L of the coil end portion 70. Thus, even when the arrangement reference surface S is a cylindrical surface arranged outside the outermost portion 43 of the slot 40 in the radial direction R, the outer peripheral surface 71 of the coil end portion 70 and the fixing fastening member 6 It is possible to ensure an appropriate insulation distance between them. Each of the recesses 72 is formed on the inner side in the radial direction R from the corresponding fixing insertion hole 4. And in this embodiment, each of the recessed part 72 is formed so that the center of the circumferential direction C of a recessed part may correspond with the center of the circumferential direction C of the corresponding penetration hole 4 for fixation. In the present embodiment, the arrangement reference plane S is concentric with the axis A and arranged outside the outermost portion 43 of the slot 40 in the radial direction R for both the coil end portions 70 on both sides in the axial direction L. A concave portion 72 is formed at a position in the circumferential direction C corresponding to each of the plurality of fixing insertion holes 4 on the outer peripheral surface 71.

  As described above, the concave portion 72 of the outer peripheral surface 71 of the coil end portion 70 is formed at a position in the circumferential direction C corresponding to the fixing insertion hole 4, and the fixing insertion hole 4 is formed in the gap 52 of the U-phase coil 3U. It is formed at a corresponding position in the circumferential direction C. Accordingly, each of the recesses 72 is formed at a position in the circumferential direction C corresponding to one of the plurality of gaps 52. Thereby, it is possible to form the concave portion 72 on the outer peripheral surface 71 of the coil end portion 70 while avoiding a large molding force from acting on the linear conductor existing at the position where the concave portion 72 is formed. . In the present embodiment, the concave portion 72 of the outer peripheral surface 71 of the coil end portion 70 is formed by press-molding the coil end portion 70. This pressure forming step is performed after the coil 3 is wound around the core 20 in the manner shown in FIG.

  An example of the pressure molding process is shown in FIGS. In this example, a first molding die 81 having a convex portion 80 corresponding to the shape of the concave portion 72 is used, and the first molding die 81 is placed on the coil end portion 70 so that the convex portion 80 faces the coil end portion 70 side. On the other hand, the coil end portion 70 is pressure-molded in a state of being disposed outside the radial direction R. At this time, the convex portion 80 is disposed at a position in the circumferential direction C corresponding to each of the plurality of fixing insertion holes 4. In this example, in addition to the first mold 81, the second mold 82 disposed on the inner side in the radial direction R with respect to the coil end portion 70 and the outer side in the axial direction L with respect to the coil end portion 70 (core A third molding die 83 disposed on the side opposite to the 20 side) is used. In the present embodiment, the first mold 81 corresponds to the “mold” in the present invention.

  A portion of the inner peripheral surface of the first mold 81 excluding the convex portion 80 is formed in a cylindrical shape having a diameter (for example, the same diameter) as the diameter of the arrangement reference surface S, and the outer peripheral surface of the second mold 82 is The core 20 is formed in a cylindrical shape having a larger diameter than the inner peripheral surface 21 (slightly larger in this example). In this example, four first molding dies 81 which are the same number as the fixing insertion holes 4 are used, and the four first molding dies 81 are brought closer to the coil end portion 70 from the outer side in the radial direction R. 4, the four first molding dies 81 are arranged on the outer side in the radial direction R with respect to the coil end portion 70. In this state, a set of inner peripheral surfaces of the four first molds 81 forms a cylindrical surface having a shape along the arrangement reference surface S except for the formation position of the convex portion 80. The second mold 82 may also be configured such that a cylindrical surface having a diameter larger than that of the inner peripheral surface 21 of the core 20 is formed by a set of outer peripheral surfaces of the plurality of second molds 82.

  Then, as shown in FIG. 6, the coil end portion 70 sandwiched between the first molding die 81 and the second molding die 82 from both sides in the radial direction R is connected to the outer side in the axial direction L using the third molding die 83. The coil end portion 70 can be molded (compression-molded) so that the concave portion 72 is formed on the outer peripheral surface 71 by applying pressure toward the inner side (core 20 side). In addition, when the coil end part 70 is pressurized using the third molding die 83 or at a stage before that, the coil end part 70 is directed from the outer side to the inner side in the radial direction R using the first molding die 81. May be pressurized.

  In the present embodiment, furthermore, in order to appropriately ensure the electrical insulation of the entire stator 1, as shown in FIG. 1, the lead terminal 90 drawn from the coil end portion 70 is arranged in the radial direction R from the coil end portion 70. And is arranged at a position that does not overlap with the fixing insertion hole 4 when viewed in the radial direction R. That is, the lead terminal 90 is arranged at a position different from the fixing insertion hole 4 in the circumferential direction C. The stator 1 is at least a power line terminal of a power line terminal 91 for connecting to a power source and a neutral point terminal 93 for forming a neutral point as a lead terminal 90 drawn from the coil end portion 70. 91 is provided. In this embodiment, the coil 3 of each phase is configured by star-connecting a plurality of concentric winding portions 10, and the stator 1 has both a power line terminal 91 and a neutral point terminal 93 as the lead terminals 90. I have. As shown in FIG. 1, both the power line terminal 91 and the neutral point terminal 93 are outside of the coil end portion 70 in the radial direction R, and when viewed in the radial direction R, It is arranged in a position that does not overlap. When each phase coil 3 is configured by delta connection of a plurality of concentric windings 10, the stator 1 is a power line terminal of the power line terminal 91 and the neutral point terminal 93 as the lead terminal 90. Only 91 is provided.

  The power line terminals 91 are terminals to which the power lines 92 at the ends of the phase coils are connected, and the same number (three in this example) of power line terminals 91 as the phase coils are provided in the stator 1. During powering of the rotating electrical machine, electric power (three-phase AC power in the present embodiment) supplied from the outside to the power line terminal 91 is supplied to the coils 3 of each phase via the power line 92. Further, the neutral point terminal 93 is a terminal to which the neutral wire at each end of the phase coil is connected to form a neutral point. In the present embodiment, two neutral point terminals 93 are provided on the stator 1 in correspondence with the coil 3 having two star connections.

[Other Embodiments]
Finally, other embodiments according to the present invention will be described. Note that the configurations disclosed in the following embodiments can be applied in combination with the configurations disclosed in other embodiments as long as no contradiction arises.

(1) In said embodiment, the recessed part 72 of the outer peripheral surface 71 of the coil end part 70 was formed by the pressure molding of the coil end part 70 using the 1st shaping | molding die 81 in which the convex part 80 was formed. The configuration is described as an example. However, the embodiment of the present invention is not limited to this. For example, the gap 52 formed in the outermost specific radial region D in the radial direction R by winding the coil 3 around the core 20 may be used as the concave portion 72 as it is. In this case, unlike the example shown in FIG. 1, the outer peripheral surface 71 of the coil end portion 70 has a concave portion similar to the concave portion 72 formed at the position in the circumferential direction C corresponding to the fixing insertion hole 4. Even in a position in the circumferential direction C that does not correspond to the insertion hole 4, in other words, it is also formed in a position in the circumferential direction C of the gap 52 where the fixing insertion hole 4 is not formed correspondingly.

(2) In the above embodiment, for both the coil end portions 70 on both sides in the axial direction L, the arrangement reference plane S is concentric with the axial center A and is more radially outward than the outermost portion 43 of the slot 40. As an example, a configuration in which the concave portion 72 is formed at a position in the circumferential direction C corresponding to each of the plurality of fixing insertion holes 4 on the outer peripheral surface 71 is described. However, the embodiment of the present invention is not limited to this. For example, of the coil end portions 70 on both sides in the axial direction L, only the coil end portion 70 on the side (the upper side in FIG. 4) on which the head of the fastening member 6 for fixing in the axial direction L is disposed is the placement reference plane. S is concentric with the axis A and is a cylindrical surface disposed outside the outermost portion 43 of the slot 40 in the radial direction R, and corresponds to each of the plurality of fixing insertion holes 4 on the outer peripheral surface 71. It is good also as a structure by which the recessed part 72 is formed in the position of the circumferential direction C to do. In this case, with respect to the coil end portion 70 on the side opposite to the side where the head of the fixing fastening member 6 in the axial direction L is disposed (the lower side in FIG. 4), the placement reference plane S is concentric with the axis A. Although the cylindrical surface is arranged outside the outermost portion 43 of the slot 40 in the radial direction R, the concave portion is formed at a position in the circumferential direction C corresponding to each of the plurality of fixing insertion holes 4 on the outer circumferential surface 71. 72 is not formed, or the arrangement reference surface S is concentric with the axis A and is a cylindrical surface arranged on the inner side of the outermost portion 43 of the slot 40 in the radial direction R. .

(3) In the above embodiment, the protruding portion 5 in which the fixing insertion hole 4 is formed is formed integrally with a portion (core main body portion) constituting the cylindrical outer peripheral surface portion of the core 20, and the core 20. The configuration formed over the entire area in the axial direction L of the (core main body) has been described as an example. However, the embodiment of the present invention is not limited to this, and the protruding portion 5 may be a separate member from the core body portion. The separate member is, for example, a member having a cylindrical portion that is fitted (for example, shrink-fitted) to the cylindrical outer peripheral surface of the core main body portion. Further, when the protruding portion 5 is a member different from the core main body portion, the protruding portion 5 is formed only in a partial region in the axial direction L of the core 20 (core main body portion). You can also

(4) In the above embodiment, the configuration in which the fixing insertion hole 4 is formed in the protruding portion 5 of the core 20 has been described as an example. However, the embodiment of the present invention is not limited to this, and the fixing insertion hole 4 may be formed on the inner side in the radial direction R from the cylindrical outer peripheral surface portion of the core 20.

(5) In the above embodiment, the configuration in which the coil 3 includes a plurality of concentric winding portions 10 formed by winding a linear conductor a plurality of times between the pair of slots 40 has been described as an example. However, the embodiment of the present invention is not limited to this, and the configuration in which the coil 3 includes a plurality of coil portions formed by winding a linear conductor a plurality of times between a plurality of pairs of slots 40, or the coil 3 has a wave-like shape. It is good also as a structure provided with two or more coil parts wound by the slot 40 so that it may become.

(6) Regarding other configurations, it should be understood that the embodiments disclosed herein are illustrative in all respects and that the scope of the present invention is not limited thereby. Those skilled in the art will readily understand that modifications can be made as appropriate without departing from the spirit of the present invention. Accordingly, other embodiments modified without departing from the spirit of the present invention are naturally included in the scope of the present invention.

[Outline of Embodiment of the Present Invention]
The embodiment of the present invention described above has at least the following configuration.
A plurality of slots (40) extending in the axial direction (L) and the radial direction (R) and having openings on both sides of the axial direction (L) and inside the radial direction (R) are distributed in the circumferential direction (C). The core (20) disposed, the coil side (30) disposed in the slot (40), and the pair of coil sides (30) with respect to the core (20) in the axial direction (L A multi-phase coil (3) wound around the core (20) with a connecting portion (50) connected outside the The core (20) has a fixing insertion hole (4) through which a fixing fastening member (6) for fixing the core (20) to the other member (2) is inserted in the axial direction (L). Provided in a plurality of locations in the circumferential direction (C), the crossover portion (50) is the radial direction set for each phase (D) having a circumferentially extending portion (51) extending in the circumferential direction (C) in the specific radial direction region (D) that is a region of (R), the coil (3) being the most in the radial direction (R) In the specific radial direction region (D) on the outer side, the core (20) is arranged such that a plurality of the circumferentially extending portions (51) having the same phase are arranged with a gap (52) along the circumferential direction (C). ) And all of the fixing insertion holes (4) are formed at positions in the circumferential direction (C) corresponding to any of the plurality of gaps (52).

  According to such a configuration, the coil is wound around the core so that a plurality of in-phase circumferentially extending portions are arranged at intervals along the circumferential direction in the radially outermost specific radial region, A fixing insertion hole is formed at a circumferential position corresponding to the gap. Therefore, it is possible to ensure a radial distance between the fixing insertion hole and the outer peripheral surface of the coil end portion as compared with the case where the fixing insertion hole is formed at a circumferential position that does not correspond to the gap. As a result, it is easy to appropriately secure an insulation distance between the fixing fastening member inserted through the fixing insertion hole and the coil end portion. And according to said structure, since each of all the fixing insertion holes is formed in the position of the circumferential direction corresponding to either of the said some clearance gap, said insulation distance is made about all the fixing insertion holes. It becomes easy to secure appropriately. As a result, it is possible to realize a stator for a rotating electrical machine in which it is easy to appropriately ensure the electrical insulation between the fixing fastening member inserted through the fixing insertion hole and the coil.

  In the embodiment of the present invention, the arrangement reference surface (S) serving as a reference for the arrangement of the outer peripheral surface (71) of the coil end portion (70) formed by the assembly of the transition portions (50) of each phase is provided. , Being concentric with the axis (A) of the core (20) and disposed outside the radial direction (R) of the outermost portion (43) of the radial direction (R) of the slot (40). A plurality of the concave portions (72) recessed inward in the radial direction (R) with respect to the arrangement reference surface (S) in the outer peripheral surface (71) of the coil end portion (70). It is preferable that the holes are formed at positions in the circumferential direction (C) corresponding to the fixing insertion holes (4).

  According to this configuration, since the concave portion that allows the outer peripheral surface of the coil end portion to be recessed radially inward is formed at a circumferential position corresponding to each of the plurality of fixing insertion holes, all the fixing insertion holes It is easy to arrange the arrangement reference plane on the outer side in the radial direction than the outermost part in the radial direction of the slot while appropriately securing the above-described insulation distance. Therefore, while ensuring adequate electrical insulation between the fixing fastening member inserted through the fixing insertion hole and the coil, the coil end portion can be secured by a large amount in the radial direction of the coil end portion. The axial arrangement area can be kept small, and the coil end portion can be reduced in size in the axial direction.

  In the embodiment of the present invention, the concave portion (72) of the outer peripheral surface (71) of the coil end portion (70) is formed with a convex portion (80) corresponding to the shape of the concave portion (72). Using the mold (81), the mold (81) is placed in the radial direction (R) with respect to the coil end part (70) so that the convex part (80) faces the coil end part (70). It is preferable that the coil end portion (70) is formed by pressure molding in a state of being disposed outside.

  According to this configuration, it is possible to realize a coil end portion having a concave portion formed on the outer peripheral surface in a relatively simple process, and to simplify the manufacturing process of the stator. In addition, if a large pressure is applied to the linear conductor that constitutes the coil during the pressure forming of the coil end portion, the insulation film of the linear conductor may be partially thin due to elongation or deformation of the linear conductor. is there. For this reason, it is desirable that the forming force acting on the linear conductor be kept as small as possible from the viewpoint of appropriately ensuring the electrical insulation of the coil. In this regard, in the above configuration, since the concave portion is formed at the position of the gap, it is possible to avoid a large molding force from acting on the linear conductor existing at the position where the concave portion is formed. A concave portion can be formed on the outer peripheral surface of the coil end portion by the convex portion.

  Moreover, the embodiment of the present invention provides a power line terminal (90) for connecting to a power source as a lead terminal (90) drawn from the coil end part (70) formed by the assembly of the transition parts (50) of each phase. 91) and a neutral point terminal (93) for forming a neutral point, at least the power line terminal (91) is provided, and the lead terminal (90) is the coil end portion (70). It is preferable that it is arranged outside the radial direction (R) and at a position that does not overlap the fixing insertion hole (4) when viewed in the radial direction (R).

  According to this configuration, in addition to the electrical insulation between the fastening member inserted into the fastening insertion hole and the coil, the electrical insulation between the fastening member and the lead terminal is also appropriately It becomes possible to ensure, and the electrical insulation of the whole stator can be ensured appropriately.

  The present invention includes a core in which a plurality of slots extending in the axial direction and in the radial direction and having openings on both sides in the axial direction and inside in the radial direction are distributed in the circumferential direction, and a coil side portion disposed in the slot. And a multi-phase coil wound around the core having a transition portion for connecting the pair of coil side portions to the core on the outer side in the axial direction can be used for a stator for a rotating electrical machine. .

1: Stator 2: Case (other member)
3: Coil 4: Fixing insertion hole 6: Fixing fastening member 20: Core 30: Coil side portion 40: Slot 43: Outermost portion 50: Crossing portion 51: Circumferentially extending portion 52: Clearance 70: Coil end portion 71: Outer peripheral surface 72: Concave portion 80: Convex portion 81: First mold (mold)
90: Lead terminal 91: Power line terminal 93: Neutral point terminal A: Center axis C: Circumferential direction D: Specific radial direction region L: Axial direction R: Radial direction S: Reference plane for placement

Claims (4)

A core extending in the axial direction and in the radial direction and having openings on both sides in the axial direction and on the inner side in the radial direction, a plurality of circumferentially distributed slots, a coil side portion disposed in the slot, and A stator for a rotating electrical machine, comprising: a plurality of coils wound around the core having a transition portion that connects a pair of the coil side portions to the core on the outer side in the axial direction; ,
The core includes fixing insertion holes through which a fixing fastening member for fixing the core to another member is inserted in the axial direction at a plurality of locations in the circumferential direction.
The crossover has a circumferentially extending portion that extends in the circumferential direction in a specific radial region that is the radial region set for each phase,
The coil is wound around the core such that a plurality of in-phase circumferentially extending portions are arranged with a gap along the circumferential direction in the radially outermost specific radial region.
A stator for a rotating electrical machine in which each of the fixing insertion holes is formed at a position in the circumferential direction corresponding to any of the plurality of gaps. An arrangement reference plane serving as a reference for the arrangement of the outer peripheral surface of the coil end portion formed by the assembly of the crossing portions of each phase is concentric with the axis of the core, and the radially outermost side of the slot Is a cylindrical surface arranged on the outer side in the radial direction than the part,
A recess that is recessed inward in the radial direction with respect to the arrangement reference surface is formed at a position in the circumferential direction corresponding to each of the plurality of fixing insertion holes on an outer peripheral surface of the coil end portion. 1. A stator for a rotating electrical machine according to 1.   The concave portion on the outer peripheral surface of the coil end portion uses a molding die in which a convex portion corresponding to the shape of the concave portion is formed, and the molding die is arranged so that the convex portion faces the coil end portion side. The stator for a rotating electrical machine according to claim 2, wherein the stator is formed by pressure-molding the coil end portion in a state of being arranged on the outer side in the radial direction with respect to the portion. Of the power line terminal for connecting to the power source and the neutral point terminal for forming the neutral point, as the lead terminal drawn from the coil end portion formed by the assembly of the transition portions of each phase, Comprising at least the power line terminal,
The said extraction terminal is the outer side of the said radial direction rather than the said coil end part, Comprising: It is arrange | positioned in the position which does not overlap with the said insertion hole for fixation seeing in the said radial direction. The stator for rotating electrical machines described in 1.

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