JP2017163753A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine having an air-core coil, at which wire connection is easy.SOLUTION: A rotary electric machine comprises an air-core coil 41 which can be inserted into a teeth portion 22 of an iron core 11 in a radial direction. The air-core coil 41 includes: a body part 61 in an annular shape whose rectangular wire 51 is wound so as to engage with the teeth portion 22; a first draw part 62 formed with an end portion 51a, of the rectangular wire 51, which is pulled out in one side in a peripheral direction in one end side in an axial direction of the body part 61; and a second draw part 63 formed with another end portion 51b, of the rectangular wire 51, which is pulled out in the other side in the peripheral direction in the one end side in the axial direction of the body part 61. The first draw part 62 is connected to the second draw part 63 of another air-core coil 41.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotating electrical machine having an air-core coil.

  The rotating electrical machine includes a stator that is fixed to a casing or the like, and a rotor that is rotatably provided inside or outside the stator in the radial direction. In a rotating electrical machine, magnetism is generated by passing a current through a winding wound around an iron core, and the rotor is rotated relative to a stator (casing or the like) by using the magnetic action of this current. For example, in a stator in which a stator winding is wound around a stator iron core, a rotating magnetic field is generated by passing a current through the stator winding. Here, the stator winding is formed by connecting a conductive wire wound around a tooth portion protruding radially inward or radially outward of the stator core.

  In manufacturing such a rotating electrical machine, an air-core coil in which a conducting wire is formed in a predetermined shape may be used when the conducting wire is wound around a tooth portion. Specifically, an air-core coil is formed in advance, and the air-core coil is fitted into the tooth portion, whereby the conducting wire is wound around the tooth portion. Thus, by using an air-core coil, the winding work around the tooth portion of the conducting wire can be facilitated. Then, the conductors are connected by electrically connecting a plurality of air-core coils fitted in the teeth. As a stator (stator) assembled using such an air-core coil, for example, there is one described in Patent Document 1.

JP 2014-192974 A

  In Patent Document 1, a connecting wire extending from the stator axial direction one end side of the stator core to the stator circumferential direction one side along the stator axial direction one end surface and extending outward in the stator radial direction is provided. The one end portion is connected to the other end portion that slightly protrudes in the stator axial direction from the one end side in the stator axial direction of the stator core. According to this technique, it is possible to perform connection between air-core coils (conductive wires) without using another member such as a bus bar.

  However, since the stator core in Patent Document 1 has a long connecting wire, it is difficult to connect the one end and the other end. Further, for example, when joining one end portion facing in the circumferential direction and the other end portion facing in the axial direction (welding, crimping, etc.), the contact range between the conducting wires is narrow, so that proper joining may not be performed. There is.

  The present invention has been made in view of the above problems, and an object thereof is to easily perform connection in a rotating electrical machine having an air-core coil.

  A rotating electrical machine according to a first aspect of the present invention that solves the above-described problem is a rotating electrical machine that includes an air-core coil that can be inserted from a radial direction into a tooth portion of an iron core, and A ring-shaped main body formed by winding a square wire so as to be engaged, and a first lead-out portion formed by drawing one end of the square wire to one side in the circumferential direction on one axial end side of the main body portion; The other end of the square wire is drawn out to the other side in the circumferential direction on one end side in the axial direction of the main body, and the first lead-out portion is another air-core coil. It is connected with said 2nd drawer | drawing-out part in.

  The rotating electrical machine according to a second aspect of the present invention that solves the above-described problem is the rotating electrical machine according to the first aspect of the present invention, wherein the first lead portion has one end portion of the square wire extending from the radially inner side to the radially outer side of the iron core. A second extending portion extending from the radially inner side to the radially outer side of the iron core, and the second extending portion extending from the radially inner side of the iron core to another air-core coil. A second extending portion that can come into contact with the first extending portion is provided.

  A rotating electrical machine according to a third invention for solving the above-mentioned problems is the rotating electrical machine according to the second invention, wherein the second extending portion extends in the same direction as the first extending portion in another air-core coil. It is characterized by being in surface contact.

  A rotating electrical machine according to a fourth invention that solves the above problem is the rotating electrical machine according to the third invention, wherein the first extending portion and the second extending portion are circumferential in the radial direction of the iron core. It is formed to be inclined to one side.

  A rotating electrical machine according to a fifth invention for solving the above-mentioned problems is the rotating electrical machine according to any one of the first to fourth inventions, wherein the air-core coil is connected to the teeth portion via a coil bobbin made of an insulating material. It is what is inserted.

  A rotating electrical machine according to a sixth invention for solving the above-mentioned problems is the rotating electrical machine according to any one of the first to fifth inventions, wherein the iron core is an integral core.

  A rotating electrical machine according to a seventh invention for solving the above-mentioned problems is the rotating electrical machine according to any one of the first to sixth inventions, wherein the rotating electrical machine is molded with a resin. .

  According to the rotating electrical machine according to the first aspect of the present invention, since the air core coils are connected by the first lead portion and the second lead portion, the wiring connection can be made without using (required) another member such as a bus bar. It can be performed. Moreover, since the 1st drawer part is pulled out to the circumferential direction one side and the 2nd drawer part is pulled out to the circumferential direction other side, lengthening of the 1st drawer part and the 2nd drawer part is carried out. Can be suppressed, and the joining of the square lines, that is, the connecting work can be easily performed.

  According to the rotating electrical machine according to the second aspect of the present invention, the one end portion and the other end portion of the square wires are directed from the radially inner side to the radially outer side, whereby the joining work of the square wires can be performed from the radially outer side. That is, the windings can be easily connected.

  According to the rotating electrical machine according to the third aspect of the invention, the first extending portion and the second extending portion are in surface contact with each other, so that the square wires can be reliably joined to each other and connection problems can be reduced.

  According to the rotating electrical machine according to the fourth aspect of the present invention, the first extending portion and the second extending portion are inclined to one side in the circumferential direction with respect to the radial direction of the iron core. Thus, the first extending portion and the second extending portion can be reliably brought into surface contact when inserted from the radial direction.

  According to the rotating electrical machine according to the fifth aspect of the invention, the air core coil and the iron core can be reliably insulated by the coil bobbin.

  According to the rotary electric machine according to the sixth aspect of the invention, since the iron core is an integral core, an increase in the number of parts can be suppressed. Even if the iron core is an integral core, an air core coil can be attached to the tooth portion, and joining (connection) between air core coils arranged adjacent to each other in the circumferential direction can be easily performed.

  According to the rotating electrical machine according to the seventh aspect of the invention, by molding with resin, insulation in the rotating electrical machine can be secured and the air-core coil can be fixed.

It is explanatory drawing (front view seen from the axial direction one side) which shows the structure of the stator with which the rotary electric machine which concerns on Example 1 is equipped. It is explanatory drawing (back view seen from the axial direction other side) which shows the structure of the stator with which the rotary electric machine which concerns on Example 1 is equipped. It is explanatory drawing (front view seen from the axial direction one side) which shows the air-core coil in the rotary electric machine which concerns on Example 1. FIG. It is explanatory drawing (side view seen from radial direction inner side) which shows the air-core coil in the rotary electric machine which concerns on Example 1. FIG. It is explanatory drawing (perspective view after an assembly | attachment) which shows the coil segment in the rotary electric machine which concerns on Example 1. FIG. It is explanatory drawing (perspective view before an assembly | attachment) which shows the coil segment in the rotary electric machine which concerns on Example 1. FIG. FIG. 3 is an explanatory diagram (a coupling portion on one side in the axial direction) illustrating a coupling portion of a coil bobbin in the rotating electrical machine according to the first embodiment. FIG. 3 is an explanatory diagram (a coupling portion on the other side in the axial direction) illustrating a coupling portion of a coil bobbin in the rotating electrical machine according to the first embodiment.

  Embodiments of a rotating electrical machine according to the present invention will be described below in detail with reference to the accompanying drawings. Needless to say, the present invention is not limited to the following examples, and various modifications can be made without departing from the spirit of the present invention.

  The rotating electrical machine according to the first embodiment of the present invention includes a substantially cylindrical stator (stator) and a rotor (rotor) that is rotatably held inside the stator in the radial direction. The structure of the stator provided in the rotating electrical machine according to the present embodiment will be described with reference to FIGS.

  As shown in FIGS. 1 and 2, the stator 1 includes a stator core (stator core) 11 that is fixed to a frame or the like (not shown), and a stator winding (stator coil) that is wound around the stator core 11. 12. Here, FIG. 1 shows a front view of a part of the stator 1 viewed from one axial direction, and FIG. 2 shows a rear view of a part of the stator 1 viewed from the other axial side. ing.

  The stator 1 generates a rotating magnetic field when a three-phase alternating current is supplied from a power supply unit (not shown), and the rotor (not shown) is rotationally driven by the rotating magnetic field. In FIG. 1 and FIG. 2, the rotor winding 12 for only one phase (for example, U phase) of the three phases (U phase, V phase, W phase) is illustrated for easy understanding of the drawings. Yes.

  The stator core 11 is formed by laminating a plurality of annular laminated steel plates (not shown) in an axial direction (a direction along a rotation axis of a rotor (rotor) (not shown) and in the longitudinal direction in FIG. 1 and FIG. 2)). And is provided with a cylindrical yoke portion 21 and a plurality of teeth portions 22 projecting radially inward from the yoke portion 21.

  Each phase stator winding 12 is formed by connecting a plurality of coil segments 31. The coil segment 31 is schematically configured from an air core coil 41 in which a square wire (a conducting wire having a square cross-sectional shape) 51 is formed in a predetermined shape, and a coil bobbin 42 that is detachably attached to the air core coil 41. It is attached to the teeth part 22 of the stator core 11 in a detachable manner.

  In the stator 1, the coil segments 31 constituting each phase are sequentially arranged in the circumferential direction, and the coil segments 31 having the same phase are arranged every other two. Therefore, every two of these coil segments 31 are connected in the circumferential direction, whereby the rotor windings 12 of each phase are connected. That is, U-phase, V-phase, and W-phase coil segments 31 are sequentially arranged in the circumferential direction, and every other U-phase coil segment 31, V-phase coil segment 31, and W-phase coil are arranged in the circumferential direction. By connecting the segments 31, the U-phase rotor winding 12, the V-phase rotor winding 12, and the W-phase rotor winding 12 are respectively connected.

  As shown in FIGS. 3 and 4, the air-core coil 41 has a winding portion 61 in which a square wire 51 is wound in a cylindrical shape corresponding to the shape of the tooth portion 22, and a start end portion (start of winding) of the square wire 51. 51a is located on one side of the winding 61 (front side in FIG. 3, on the upper side in FIG. 4) from one coil end 61a in the circumferential direction (on the right side in FIGS. 3 and 4). The drawn-out first lead-out portion 62 and the end portion (end portion of winding end) 51b of the square wire 51 are connected to the other side in the circumferential direction from one coil end 61a in the winding portion 61 (leftward in FIGS. 3 and 4). And a second lead-out portion 63 that is pulled out to the side).

Here, FIG. 3 shows a front view of the air-core coil 41 as viewed from one side in the axial direction, and FIG. 4 shows a side view of the air-core coil 41 as viewed from the radially inner side. 3 and 4, the stator 1 in a state where the air core coil 41 is mounted on the stator core 11 so that the mounting state (direction) of the air core coil 41 to the stator core 11 can be understood. arrow D _a showing the axial direction, an arrow D _R indicating the radial direction, and the arrow D _C indicating the circumferential direction respectively displayed.

  The first lead-out part 62 is one side in the axial direction from one coil side 61b in the winding part 61 (right side in FIGS. 3 and 4) (front side in FIG. 3, upper side in FIG. 4). A first axially extending portion 62a projecting from one end of the coil end 61a in the winding portion 61 (the right side end portion in FIGS. 3 and 4) and the first axially extending portion 62a A first circumferentially extending portion 62b extending from the end portion toward one side in the circumferential direction, and a radially outer side from the end portion of the first circumferentially extending portion 62b (the upper side in FIG. 3, the back of the page in FIG. 4) A first radially extending portion 62c extending toward the side), a second circumferential extending portion 62d extending from the end of the first radially extending portion 62c toward one side in the circumferential direction, and a second circumferential direction. Second axially extending portion 6 extending from the end of the extending portion 62d toward the one axial side. e, a second radially extending portion 62f extending from the end of the second axially extending portion 62e toward the radially inner side (the lower side in FIG. 3, the front side in FIG. 4), and the second A third circumferentially extending portion 62g extending from the end of the radially extending portion 62f toward one side in the circumferential direction, and a third diameter extending from the end of the third circumferentially extending portion 62g toward the radially outer side. It is comprised from the direction extension part 62h.

  On the other hand, the second lead-out part 63 extends from the other coil side 61b of the winding part 61 (left side in FIGS. 3 and 4) toward the one side in the axial direction. An axially extending portion 63a protruding from the end (the left side end portion in FIGS. 3 and 4), and a circumferentially extending portion extending from the end of the axially extending portion 63a toward the other circumferential side 63b and a radially extending portion 63c extending radially outward from the end of the circumferentially extending portion 63b.

  Therefore, as shown in FIG. 1, in the state where the coil segment 31 (air core coil 41) is mounted on the stator core 11 (tooth portion 22), the starting end portion 51a of the square wire 51 is adjacent to one side in the circumferential direction. The tooth portion 22 is positioned over the teeth portion 22 (in the vicinity of the two adjacent teeth portions 22) and substantially outward in the radial direction, and the terminal portion 51b of the square line 51 is adjacent to the other side in the circumferential direction. And is directed substantially outward in the radial direction. That is, air core coils 41 that are adjacent in the circumferential direction in the same phase (in the stator 1, three air core coils 41 that are adjacent to each other in the circumferential direction) have a start end portion 51 a and a terminal end portion 51 b of each square line 51. Are in the same position and in the same direction, and the third radially extending portion 62h including the start end portion 51a and the radially extending portion 63c including the terminal end portion 51b are in surface contact.

  In the present embodiment, the third radially extending portion 62h (starting end portion 51a of the square wire 51) and the radially extending portion 63c (terminal portion 51b of the rectangular wire 51) are slightly slightly circumferentially extended from the radial direction. When the coil segment 31 (air core coll 41) is attached to the stator core 11 (moved from the radially inner side to the radially outer side) by tilting to the side, air cores adjacent in the circumferential direction in the same phase The coils 41 are surely brought into surface contact with each other.

  Then, by joining (welding, crimping, etc.) the third radial extending portion 62 h of the first lead portion 62 and the radial extending portion 63 c of the second lead portion 63, the air-core coil 41 of the same phase. The coil segments 31 are electrically connected, and the stator winding 12 for one phase (for example, U phase) in the stator 1 is connected. Similarly, the stator 1 is manufactured by connecting the stator windings 12 of other phases (for example, V phase and W phase).

  That is, in the stator 1, the first lead portion 62 and the second lead portion 63 of the air-core coil 41 function as a connecting wire for the coil segment 31. By using such an air-core coil 41, no separate member such as a bus bar is required for the connection of the stator winding 12, so that the number of parts in the manufacture can be reduced. Further, in the state where the coil segment 31 (air core coil 41) is mounted on the stator core 11, the third radial extending portion 62h of the first lead portion 62 in the air core coil 41 adjacent in the circumferential direction in the same phase. And the radially extending portion 63c of the second lead portion 63 are in surface contact with each other, so that the joining of the square wires 51 (connection of the stator windings 12) can be easily performed.

  Further, in a state where the plurality of coil segments 31 (air core coils 41) are mounted on the stator core 11, the air core coils 41 (square wires 51) do not interfere with each other (FIGS. 1 and 3). reference).

  First, the first circumferentially extending portion 62b and the first radially extending portion 62c are wound in the air-phase coil 41 of the other phase that is disposed adjacent to one side in the circumferential direction by the first axially extending portion 62a. Since they are arranged on one side in the axial direction from (not shown in FIG. 1), they do not interfere with each other.

  Further, the second circumferentially extending portion 62d includes the first axially extending portion 62a and the first circumferential portion of the other-phase air-core coil 41 that are adjacently disposed on one side in the circumferential direction by the first radially extending portion 62c. Since they are arranged radially outward from the direction extending portion 62b (not shown in FIG. 1), they do not interfere with each other.

  Further, the second radial extension portion 62f, the third circumferential extension portion 62g, and the third radial extension portion 62h are adjacent to each other in the circumferential direction by the second axial extension portion 62e. One axial direction than the first circumferentially extending portion 62b, the first radially extending portion 62c, and the second circumferentially extending portion 62d (not shown in FIG. 1) of the air-core coil 41 of FIG. Since they are arranged on the side, they do not interfere.

  Further, the circumferentially extending portion 63b and the radially extending portion 63c are wound around the winding portion 61 (in FIG. 1) of the air-core coil 41 of the other phase disposed adjacent to the other circumferential side by the axially extending portion 63a. Since they are arranged on one side in the axial direction from (not shown), they do not interfere with each other.

  As shown in FIGS. 5 and 6, the coil bobbin 42 includes an outer bobbin 71 located on the radially outer side (upper side in FIGS. 5 and 6) and a radially inner side (lower side in FIGS. 5 and 6). The inner bobbin 72 located on the side) is coupled so as to sandwich the air-core coil 41 in the radial direction.

Here, FIG. 5 shows the coil segment 31 in a state after the coil bobbin 42 is attached to the air-core coil 41, and FIG. 6 shows the coil segment 31 in a state before the coil bobbin 42 is attached to the air-core coil 41. Is shown. 5 and 6, similarly to FIGS. 3 and 4, the arrow D _A indicating the axial direction of the stator 1 in the state where the air-core coil 41 is mounted on the stator core 11, and the radial direction are shown. An arrow D _R and an arrow D _C indicating the circumferential direction are displayed.

  The outer bobbin 71 is provided with a main body 81 that covers a part of the winding portion 61 of the air-core coil 41, and one side in the axial direction of the main body 81 (the right front side in FIG. 5 and FIG. 6). A first covering portion 82 that covers a part of the first lead portion 62 of the core coil 41 and a part of the first lead portion 62 of the air core coil 41 of the other phase that is provided on one side in the axial direction of the main body portion 81 ( 5 and FIG. 6, a second covering portion 83 that covers (not shown) and the other side in the axial direction of the main body portion 81 (in FIG. 5 and FIG. 6, the left rear side of the page) and one side in the circumferential direction A circumferentially extending portion 84 is provided that extends in (in FIG. 5 and FIG. 6, the right rear side on the paper surface).

  The main body 81 covers both the axial direction both sides and the radial outside of the coil end 61a in the winding portion 61 of the air-core coil 41, and the circumferential side and the radial outside of the coil side 61b. Therefore, in a state where the coil segment 31 (air core coil 41 and coil bobbin 42) is mounted on the stator core 11, the main body 81 includes the air core coil 41 (winding portion 61) and the stator core 11 (yoke portion 21). ) And the stator core 11 and the stator winding 12 are reliably insulated.

  The first covering portion 82 includes a first axial extension portion 62a, a first circumferential extension portion 62b, a first radial extension portion 62c, and a second circumferential extension of the first lead portion 62 of the air-core coil 41. One side in the axial direction and the outside in the radial direction of the protruding part 62d and the second axially extending part 62e are covered. Therefore, in a state in which the coil segment 31 (air core coil 41 and coil bobbin 42) is mounted on the stator core 11, the first covering portion 82 and the air core of the other phase with the air core coil 41 (first lead portion 62). Between the coil 41 (the first lead portion 62 and the second lead portion 63) and between the air core coil 41 (the first lead portion 62) and other members (not shown) arranged outside the stator 1 The stator windings 12 having different phases, and the stator windings 12 and other members are reliably insulated from each other (see FIG. 1).

  The second covering portion 83 covers one axial side and the radially inner side of the second radially extending portion 62f and the third circumferentially extending portion 62g in the first leading portion 62 of the air core coil 41 of the other phase. Yes. Therefore, in a state in which the coil segment 31 (air core coil 41 and coil bobbin 42) is mounted on the stator core 11, the second covering portion 83 and the air core coil 41 (second lead portion 63) are in the other phase. The stator windings 12 (second lead portion 63 and first lead portion 62) having different phases are interposed between the core lead 41 and the first lead portion 62, and are reliably insulated.

  In the state where the coil segment 31 (coil bobbin 42) is mounted on the stator core 11, the circumferentially extending portion 84 is radially outward of the tooth portion 22 adjacent to one side in the circumferential direction (yoke portion 21), that is, the circumferential portion. It is located radially outside the coil bobbin 42 (coil segment 31) adjacent to one side in the direction (see FIG. 2).

  The outer bobbin 71 has a first engagement portion 85 that engages with the inner bobbin 72, and a second engagement that engages with the air core coil 41 (inner bobbin 72) of another phase that is adjacently disposed in the circumferential direction. A portion 86 is provided.

  The first engaging portions 85 are provided on both sides in the axial direction of the main body portion 81, and protrude so as to face each other toward the axial center. The engagement between the outer bobbin 71 and the inner bobbin 72 by the first engagement portion 85 will be described later.

  The second engaging portion 86 is provided on the distal end side of the circumferentially extending portion 84 and protrudes toward the center in the axial direction. The engagement between the coil segment 31 (outer bobbin 71) and the other-phase coil segment 31 (inner bobbin 72) by the second engaging portion 86 will be described later.

  As shown in FIGS. 5 and 6, the inner bobbin 72 is provided with a main body portion 91 that covers a part of the winding portion 61 of the air core coil 41, and an air core coil 41 that is provided on one axial side of the main body portion 91. And a covering portion 92 that covers a part of the second lead-out portion 63.

  The main body portion 91 covers both the axial direction both sides and the radial outside of the coil end 61a in the winding portion 61 of the air-core coil 41, and the circumferential side and the radial outside of the coil side 61b. Therefore, in a state in which the coil segment 31 (air core coil 41 and coil bobbin 42) is mounted on the stator core 11, the main body portion 91, together with the main body portion 81 of the outer bobbin 71, the air core coil 41 (winding portion 61). And the stator core 11 (tooth portion 22), the stator core 11 and the stator winding 12 are reliably insulated.

  Further, in a state where the coil segment 31 (air core coil 41 and coil bobbin 42) is mounted on the stator core 11, the main body portion 91 together with the main body portion 81 of the outer bobbin 71, the air core coil 41 (in the winding portion 61). Between the at least one coil side 61b) and the other-phase air core coil 41 (the other coil side 61b in the winding 61) adjacently disposed in the circumferential direction, that is, the air core coil 41 adjacently disposed in the circumferential direction. These air-core coils 41 (the air-core coils 41 arranged adjacent to each other in the circumferential direction and having different phases) are reliably insulated.

  In addition, when the coil segment 31 (air core coil 41 and coil bobbin 42) is mounted on the stator core 11, the main body 91 is located on the radially inner side of the air core coil 41, and the air core coil 41. Detachment from the teeth portion 22 (coil bobbin 42) is prevented.

  The covering portion 92 covers the other axial side and the radially inner side of the axially extending portion 63a and the circumferentially extending portion 63b of the second lead portion 63 of the air-core coil 41. Therefore, in a state where the coil segment 31 (air core coil 41 and coil bobbin 42) is mounted on the stator core 11, the covering portion 92 is disposed adjacent to the air core coil (second lead portion 63) in the circumferential direction. The air core coils 41 (winding portions 61) of the other phases are interposed between the air core coils 41 (the air core coils 41 arranged adjacent to each other in the circumferential direction and having different phases). Insulated.

  As shown in FIGS. 5 and 6, the inner bobbin 72 is provided with an engaging portion 93 that engages with the outer bobbin 71. The engaging portions 93 are provided on both sides in the axial direction of the main body portion 91, and the outer bobbin 71 (first engaging portion 85) in the coil segment 31 and the coil segment of the other phase arranged adjacent to the circumferential direction. 31 is engaged with the outer bobbin 71 (second engaging portion 86).

  The engaging portions 93 protrude outward in the radial direction, and are formed in pairs along the circumferential direction. The pair of engaging portions 93 includes a first projection 101 projecting in an opposite direction at a substantially central portion in the radial direction, and a second projection 102 projecting in the opposite direction at a tip portion (radially outer end portion). Is provided (see FIG. 6).

  The pair of first protrusions 101 can be engaged with the first engagement portion 85 in the main body 81 of the outer bobbin 71 by relative movement in the mounting direction of the outer bobbin 71 and the inner bobbin 72. Therefore, when the outer bobbin 71 and the inner bobbin 72 are separated from each other in the mounting direction, the pair of first protrusions 101 in the protruding portion 93 of the inner bobbin 72 and the first engagement in the main body portion 81 of the outer bobbin 71 are detected. The joining portion 85 is engaged, and the outer bobbin 71 and the inner bobbin 72 are coupled.

  As shown in FIGS. 7 and 8, when the outer bobbin 71 and the inner bobbin 72 are coupled, the first engagement portion 85 in the main body 81 of the outer bobbin 71 is a pair of inner bobbins 72. Located between the protrusions 93 (inner circumferential direction), the first protrusion 101 is hooked in the direction in which the coil bobbin 42 is detached (in the radial direction, the vertical direction in FIGS. 7 and 8).

Here, FIG. 7 shows a state of coupling between the outer bobbin 71 and the inner bobbin 72 on one side in the axial direction and coupling between the coil bobbins 42 arranged adjacent to each other in the circumferential direction, and FIG. 8 shows the other side in the axial direction. The state of the connection between the inner bobbin 72 and the outer bobbin 71 and the connection between the coil bobbins 42 arranged adjacent to each other in the circumferential direction is shown. 7 and 8, similarly to FIGS. 3 to 6, the arrow D _A indicating the axial direction of the stator 1 in the state where the air-core coil 41 is mounted on the stator core 11, and the radial direction are shown. An arrow D _R and an arrow D _C indicating the circumferential direction are displayed.

  When the outer bobbin 71 and the inner bobbin 72 are mounted, the outer bobbin 71 and the inner bobbin 72 are radially moved so as to push the first engaging portion 85 between the pair of projecting portions 93 (inner circumferential direction). Move relatively. By this relative movement, the first engagement portion 85 spreads the pair of protrusions 93 outward in the circumferential direction, and the relative position between the first engagement portion 85 and the protrusion 93 is a predetermined position (a coupling position, When the position shown in FIGS. 7 and 8 is reached, the first engaging portion 85 and the protruding portion 93 (first protrusion 101) are hooked. The outer bobbin 71 and the inner bobbin 72 are coupled to each other by the hook between the first engaging portion 85 and the protruding portion 93 (first protrusion 101).

  The first engagement portion 85 is tapered on the radially inner side (the lower side in FIGS. 7 and 8) and on the radial outer side (the upper side in FIGS. 7 and 8) of the first protrusion 101, respectively. Portions 85a and 101a are formed. Therefore, when the outer bobbin 71 and the inner bobbin 72 are mounted, the pair of protrusions 93 can be smoothly spread out by the first engagement portion 85. That is, the outer bobbin 71 and the inner bobbin 72 can be easily coupled.

  The pair of second protrusions 102 is a pair of second protrusions 84 of the circumferential extension 84 in the outer bobbin 71 of the coil segment 31 that is disposed adjacent to the other circumferential side by relative movement in the mounting direction of the outer bobbin 71 and the inner bobbin 72. It can be engaged with the two protrusions 102 (see FIGS. 5 and 6). Accordingly, when the coil segment 31 is inserted into the tooth portion 22 adjacent to one side in the circumferential direction with respect to the coil segment 31 of the other phase arranged adjacent to the other side in the circumferential direction, the circumferential direction of the outer bobbin 71 of the coil segment 31 The second protrusion 102 of the extension 84 engages with the first protrusion 101 of the protrusion 93 in the inner bobbin 72 of the coil segment 31 of the other phase, and the coupling between the coil segments 31 (coil bobbins 42) adjacent in the circumferential direction is established. It has been made.

  As shown in FIGS. 7 and 8, when the coil bobbins 42 adjacent to each other in the circumferential direction are coupled to each other, the second engaging portion 86 in the circumferentially extending portion 84 of the outer bobbin 71 is the inner bobbin 72. The second protrusion 102 is hooked in the direction in which the coil bobbin 42 is detached.

  When the coil bobbins 42 adjacent to each other in the circumferential direction are coupled to each other, the pair of protrusions 93 are pushed between the second engagement portions 86 (inside in the circumferential direction), and the other side in the circumferential direction (already inserted). The coil segment 31 on one side in the circumferential direction is moved relative to the coil segment 31 in the radial direction. By this relative movement, the second engaging portion 86 pushes and narrows the pair of protruding portions 93 inward in the circumferential direction, and the relative position between the second engaging portion 86 and the protruding portion 93 is a predetermined position (a coupling position, 7 and 8, the second engaging portion 86 and the protruding portion 93 (second protrusion 102) are hooked. The coil bobbins 42 (coil segments 31) adjacent to each other in the circumferential direction are coupled to each other by the hook between the second engaging portion 86 and the protruding portion 93 (second protrusion 102).

  Tapered portions 86 a and 102 a are formed on the radially inner side of the second engaging portion 86 and the radially outer side of the second protrusion 102, respectively. Therefore, when the coil bobbins 42 adjacent to each other in the circumferential direction are coupled to each other, the pair of protrusions 93 can be smoothly pushed and narrowed by the second engagement portion 86. That is, the coil segments 31 adjacent in the circumferential direction can be easily coupled.

  Thus, in the state where the coil bobbins 42 adjacent in the circumferential direction are coupled to each other, there is no possibility that the stator core 11 is detached in the mounting direction. This is because the teeth portions 22 of the stator core 11 have different phases, and the mounting directions of the coil segments 31 attached to the teeth portions 22 also have different phases. Therefore, even if the several coil segment 313 is not couple | bonded with the stator core 11, it is prevented from dropping from the stator core 11 by being connected with each other.

  A manufacturing procedure of the stator 1 provided in the rotating electrical machine according to the present embodiment will be described with reference to FIGS. 1 and 8.

  First, the air core coil 41 is manufactured by forming the square wire 51 in a predetermined shape (see FIGS. 3 and 4), and the coil segment 31 is manufactured by attaching the coil bobbin 42 to the air core coil 41. (See FIGS. 5 and 6). At this time, the outer bobbin 71 and the inner bobbin 72 can be easily mounted without the first engaging portion 85 and the first protrusion 101 being caught by the tapered portions 85a and 101a.

  Next, the coil segment 31 is inserted into the tooth portion 22 of the stator core 11 from the radially inner side to the radially outer side, and then another coil segment 31 is inserted into the tooth portion 22 adjacent to one side in the circumferential direction. Insert in the same way.

  At this time, the other coil segment 31 inserted into the tooth portion 22 on one side in the circumferential direction is disposed adjacent to the other side in the circumferential direction due to the engagement between the second engagement portion 86 and the second protrusion 102 (circumferential direction). The coil segment 31 (which has already been inserted into the tooth portion 22 on the other side) is coupled. Therefore, these coil segments 31 do not fall off the stator core 11 (tooth portion 22). Similarly, the coil segments 31 are inserted (attached) into the tooth portion 22 in order along the circumferential direction of the stator core 11.

  And the 3rd radial direction extension part 62h and the radial direction extension part 63c in the coil segment 31 arrange | positioned adjacently (inserted in the two adjacent teeth part 22) in the same phase are joined (welding, crimping, etc.). By doing so, the stator winding 12 of each phase can be connected.

  At this time, the coil segments 31 arranged adjacent to each other in the same phase (inserted into the two adjacent teeth portions 22) are in surface contact at the third radial extension portion 62h and the radial extension portion 63c, Joining between the coil segments 31 can be easily performed.

  As described above, the stator 1 is manufactured by attaching the coil segments 31 to all the teeth portions 11b of the stator core 11, joining the coil segments 31 of each phase, and then molding with resin. .

  As described above, according to the rotating electrical machine according to the present embodiment, the coil segment 31 (air core coil 41) can be easily joined.

1 Stator 11 Stator core (stator core, iron core)
12 Stator winding (stator coil, winding)
21 Stator Core Yoke 22 Stator Core Teeth 31 Coil Segment 41 Air Core Coil 42 Coil Bobbin 51 Square Wire 51a Square Wire Start End 51b Square Wire End 61 61 Air Core Coil Winding (Main Body)
61a Coil side of winding part 61b Coil end 62 of winding part First extraction part 62a of air-core coil First axial extension part 62b of first extraction part First circumferential extension part 62c of first extraction part First First radial extension portion 62d of the first extraction portion Second circumferential extension portion 62e of the first extraction portion Second axial extension portion 62f of the first extraction portion Second radial extension portion 62g of the first extraction portion Third circumferential extending portion 62h of the first leading portion Third radial extending portion of the first leading portion (first extending portion)
63 Second extraction part 63a of the air core coil Axial extension part 63b of the second extraction part Circumferential extension part 63c of the second extraction part Radial extension part (second extension part) of the second extraction part
71 Outer bobbin 72 Inner bobbin 81 Outer bobbin main body part 82 Outer bobbin first covering part 83 Outer bobbin second covering part 84 Outer bobbin circumferential extending part 85 Outer bobbin first engaging part 85a First engagement Joint portion taper portion 86 Outer bobbin second engagement portion 91 Inner bobbin main body portion 92 Inner bobbin cover portion 93 Inner bobbin engagement portion 101 First protrusion 101a of engagement portion First protrusion taper portion 102 Joint second protrusion 102a Tapered part of second protrusion

Claims (7)

A rotating electrical machine having an air-core coil that can be inserted from the radial direction into the teeth portion of the iron core,
The air-core coil includes an annular main body formed by winding a square wire so as to engage with the teeth portion, and one end of the square wire on one end in the circumferential direction on one end side in the axial direction of the main body portion. A first drawing portion drawn out, and a second drawing portion formed by drawing the other end portion of the square line to the other circumferential side on one axial end side of the main body portion,
Said 1st drawer | drawing-out part is connected with said 2nd drawer | drawing-out part in another air-core coil. The rotary electric machine characterized by the above-mentioned. The first lead portion is provided with a first extending portion extending from a radially inner side of the iron core toward a radially outer side of one end portion of the square wire,
The second extension part extends from the radially inner side of the iron core toward the radially outer side of the other end of the square wire, and can be in contact with the first extension part of another air-core coil. The rotating electrical machine according to claim 1, comprising a portion. The rotating electrical machine according to claim 2, wherein the second extending portion extends in the same direction as the first extending portion in another air-core coil and is in surface contact. 4. The rotating electrical machine according to claim 3, wherein the first extending portion and the second extending portion are formed to be inclined toward one side in a circumferential direction with respect to a radial direction of the iron core. The rotating electrical machine according to any one of claims 1 to 4, wherein the air-core coil is inserted into the teeth portion via a coil bobbin made of an insulating material. The rotating electrical machine according to any one of claims 1 to 5, wherein the iron core is an integral core. The rotating electrical machine according to any one of claims 1 to 6, wherein the rotating electrical machine is molded from a resin.

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