JP2010239680A - Armature for rotary electric machine and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an armature for rotary electric machine wherein it is possible to wind a coil in a slot, regardless of the combination of the shape of each slot provided in a core and the shape of a conductor making up the coil. <P>SOLUTION: The armature for rotary electric machines includes a core and a coil 21. The core includes multiple tooth pieces 41, having a tooth-side fitting portion 35 and a cylindrical yoke portion 31, having a yoke-side fitting portion 45. The coil 21 is formed substantially in a cylindrical shape, by dispersedly arranging multiple coil side portions 22, set in slots, in the circumferential direction and is formed so that the outside diameter of a coil end portion on at least one side in the axial direction is smaller than the inside diameter of the yoke portion 31; each tooth piece 41 is so formed that it is insertable into between adjacent coil side portions 22 in the radial direction; and the yoke-side fitting portion 35 and the tooth-side fitting portion 45 have such a shape that they can be relatively moved in the axial direction and fit together. With these portions fitting together, the tooth pieces 41 are fixed on the yoke portion 31 in the radial direction and in a circumferential direction. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an armature for a rotating electrical machine including a cylindrical core having a plurality of axially extending slots distributed in the circumferential direction, and a coil wound around the slot, and a method for manufacturing the same.

  In general, a rotating electrical machine used as a motor (electric motor), a generator (generator) or the like is required to have a smaller physique and a larger output. Therefore, increasing the energy efficiency of the rotating electrical machine is one of important issues. Here, as a technique for increasing the energy efficiency of the rotating electrical machine, for example, a technique for improving the space factor of the coil in the armature of the rotating electrical machine has been conventionally known.

The following Patent Document 1 is given as a document describing improving the space factor of a coil. In the stator as an armature for a rotating electrical machine described in Patent Document 1, the space factor is improved by forming a coil using a rectangular conductor having a substantially rectangular cross section, and the ampere turn per unit cross section The output of the rotating electrical machine is improved by increasing the power.
In the rotating electrical machine described in Patent Document 1, the stator slot is an open slot (the circumferential width of the inner circumferential opening that opens radially inward is equal to or greater than the circumferential width of the portion where the coil is mounted). The coil, which is pre-formed into a predetermined shape by continuous winding, is inserted in the radial direction from the inner peripheral opening of the open slot and wound around the slot while being deformed in the circumferential direction and the axial direction. . Thereby, after inserting a coil in a slot, it is possible to reduce the location which should be electrically connected and to improve productivity.

Moreover, the following patent document 2 is mentioned as another literature in which improving the space factor of a coil was described. In the stator as the armature for a rotating electrical machine described in Patent Document 2, a coil having a predetermined shape is formed by laminating thin wires in the circumferential direction and the radial direction. At this time, in order to increase the space factor in the slot, the thin wires are stacked and bundled so as to have a cross-sectional shape corresponding to the cross-sectional shape of the slot.
In the stator of the rotating electrical machine described in Patent Document 2, the slot provided in the stator core is a semi-open slot (the width of the inner circumferential opening that opens radially inward is the portion where the coil is mounted). The slot is narrower than the width in the circumferential direction. Thereby, the output of the rotating electrical machine is also improved by increasing the effective magnetic flux acting between the stator and the rotor as the field. Here, in the stator of this rotating electric machine, as the semi-open slot type core is used, the thin wire is bent radially inward and laminated in the axial direction at the coil end portion on one axial side of the coil. Pre-formed into a different shape. In other words, in the portion where the thin wire constituting the coil extends in the radial direction, the circumferential width of the portion is set to be larger than the width of the inner peripheral opening portion on the radially inner side of the slot by not laminating the thin wire in the circumferential direction. The small and pre-formed coil is inserted in the axial direction from the side of the bent coil end and wound around the slot of the core.

JP 2008-167567 A Japanese Patent No. 3798968

  However, since the rotating electrical machine described in Patent Document 1 is an open slot, the circumferential width of the inner circumferential opening of the slot is large, and the surface area of the rectangular conductor on the rotor side is large. Therefore, when the rotor rotates, the magnetic flux from a permanent magnet or the like reaches the rectangular conductor, and an eddy current is generated on the rotor side surface. For this reason, there is a problem that eddy current loss increases and the energy efficiency of the rotating electrical machine may decrease instead.

  In this regard, in order to reduce the amount of magnetic flux from a permanent magnet or the like reaching the rectangular conductor and reduce eddy current loss, a core having a semi-open type slot as described in Patent Document 2 is used. It can also be used. However, even if an attempt is made to configure a rotating electrical machine by combining a core having a semi-open slot and a coil made of a rectangular conductor, the circumferential width of the rectangular conductor itself is the circumferential direction of the inner peripheral opening of the slot. Since it is wider than the width, the coil cannot be inserted into the slot from the inside in the radial direction as described in Patent Document 1. Further, even if the coil end portion on one side in the axial direction is bent inward in the radial direction, the circumferential width itself of the rectangular wire conductor is still wider than the circumferential width of the inner circumferential opening of the slot. Neither can the coil be axially inserted into the slot as described in.

  In this way, because of the difficulty in manufacturing itself, it has hitherto been possible to configure a rotating electrical machine using a semi-open slot type core and a coil formed in a predetermined shape using a rectangular conductor. It wasn't.

  The present invention has been made in view of the above-described problems, and relates to an electric machine for a rotating electrical machine capable of winding a coil in the slot regardless of the combination of the shape of the slot of the core and the shape of the conductor constituting the coil. The purpose is to provide children. In particular, an object of the present invention is to provide an armature for a rotating electrical machine that can wind a coil composed of a rectangular conductor in a semi-open slot.

  To achieve this object, a rotating electrical machine comprising a cylindrical core having a plurality of axially extending slots distributed in the circumferential direction according to the present invention, and a coil wound around the slot. The core is characterized in that the core has a teeth side fitting portion, a plurality of teeth pieces arranged between the plurality of slots, and a cylindrical shape having the same number of yoke side fitting portions as the teeth pieces. A coil portion, and the coil is formed in a substantially cylindrical shape by distributing a plurality of coil side portions arranged in the slot in the circumferential direction, and at least the coil end portion on one side in the axial direction. An outer diameter is formed smaller than an inner diameter of the yoke portion, and the teeth pieces are formed to be insertable in a radial direction between the adjacent coil side portions, and the yoke side fitting portion and the teeth side fitting portion are formed. Relative to the axial direction Dynamic and has a shape to be fitted in, in that a plurality of the teeth piece relative to the yoke portion in a state in which they are fitted is fixed to the radial direction and the circumferential direction.

In the present application, the directions of “axial direction”, “radial direction”, and “circumferential direction” are determined based on a cylindrical core. At this time, each direction about each teeth piece shall be prescribed | regulated as a direction in the state in which each teeth piece and the yoke part were integrated. Similarly, each direction about a coil shall prescribe | regulate as a direction in the state by which the coil was wound by the slot.
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.

  According to the above characteristic configuration, since the outer diameter of the coil end portion on at least one axial side is smaller than the inner diameter of the yoke portion, the yoke portion is inserted relative to the coil in the axial direction. Can do. At that time, the yoke-side fitting portion and the teeth-side fitting portion have a shape that can be moved relative to each other in the axial direction so that the teeth can be fitted to each other. With the joint portion inserted in the radial direction toward the radially outer side, the yoke side fitting portion of the yoke portion and the tooth side fitting portion of each tooth piece are relatively moved in the axial direction to be fitted, The yoke portion and each tooth piece can be integrated. Therefore, for example, when the slot of the core is a semi-open type slot and the circumferential width of the conductor constituting the coil is wider than the circumferential width of the inner circumferential opening that opens radially inward of the slot. Even in such a case, the coil can be wound around the semi-open slot. Even when the slot of the core is an open slot, the coil can naturally be wound. That is, according to the above characteristic configuration, it is possible to provide an armature for a rotating electrical machine capable of winding a coil in the slot regardless of the combination of the shape of the slot of the core and the shape of the conductor constituting the coil. it can.

  In the above configuration, since the plurality of teeth pieces are fixed to the yoke portion in the radial direction and the circumferential direction in a state where the yoke side fitting portion and the teeth side fitting portion are fitted, It is possible to prevent the teeth pieces from coming out inward in the radial direction after the teeth pieces are integrated with each other, and prevent the tooth pieces from wobbling in the circumferential direction to suppress the output of the rotating electrical machine from being lowered. Can do.

  The above-described characteristic configuration is such that the circumferential width of the inner circumferential opening that opens radially inward of the slot is greater than the circumferential width of the slot located radially outward of the inner circumferential opening. The linear conductor forming the coil is particularly suitable as a configuration applicable to an armature for a rotating electrical machine in which the circumferential width is wider than the circumferential width of the inner circumferential opening. Yes. Here, “linear conductor” is used as a concept representing a conductor as one linear member constituting each turn of the coil.

That is, in such a configuration, since the circumferential width of the linear conductor is wider than the circumferential width of the inner circumferential opening of the slot, as described in the background art section, the coil is usually arranged in the radial direction or in the slot. It is very difficult to insert relative to the axial direction. However, even if it is the armature for rotary electric machines provided with such a structure, a coil can be appropriately wound by a semi-open type slot by applying this invention.
At this time, since the circumferential width of the linear conductor can be freely set within a range in which the coil can be wound around the slot, the circumferential width of the linear conductor is substantially equal to the circumferential width inside the slot, for example. By setting it equal, the space factor of the coil can be improved. In the above configuration, the slot of the core is a semi-open type slot. Therefore, the amount of magnetic flux from a permanent magnet or the like included in the field reaches the surface of the linear conductor constituting the coil can be reduced. Therefore, generation of eddy current can be suppressed and eddy current loss can be reduced. Therefore, with this configuration, it is possible to simply provide an armature for a rotating electrical machine that can reduce eddy current loss while improving the space factor of the coil.

  Here, one of the teeth side fitting portion and the yoke side fitting portion is a fitting convex portion, and the other is a fitting concave portion, and the fitting convex portion and the fitting Each of the recesses preferably has a configuration in which the cross-sectional shape of the surface orthogonal to the axial direction is the same throughout the entire axial direction, and has a circumferential protrusion or a circumferential recess along the radial direction in at least one place. .

  According to this structure, the teeth side fitting part and the yoke side fitting part can be appropriately formed by the combination of the fitting convex part and the fitting concave part. In addition, since the fitting convex portion and the fitting concave portion have at least one circumferential convex portion or circumferential concave portion along the radial direction, the tooth piece has a diameter after the yoke portion and each tooth piece are integrated. It is possible to prevent the teeth from slipping out inward, and to prevent wobbling in the circumferential direction of each tooth piece.

  Further, it is preferable that the tooth side fitting portion is a fitting convex portion and the yoke side fitting portion is a fitting concave portion.

According to this configuration, the fitting position between the teeth-side fitting portion and the yoke-side fitting portion in the radial direction is surely more diameter than the radially outer end of the coil end portion on one axial side. The direction can be outside. Therefore, regardless of the shape of the coil end portion, it is possible to reliably insert the yoke portion relative to the axial direction in a state where the teeth pieces are inserted in the radial direction between the adjacent coil side portions.
Also, among the yoke part and each tooth piece, the workability is improved by forming a fitting concave part on the yoke part, which is the larger member, and a fitting convex part on each tooth piece, which is the smaller member. Can be.

  Moreover, it is preferable that the teeth side fitting portion and the yoke side fitting portion have meandering surfaces complementary to each other extending in a wavy shape in the radial direction.

  According to this configuration, both the circumferential convex portion and the circumferential concave portion are formed on both the teeth side fitting portion and the yoke side fitting portion by means of mutually complementary meandering surfaces extending in a wave shape in the radial direction. The plurality of teeth pieces can be appropriately fixed to the yoke portion in the radial direction and the circumferential direction. Therefore, it is possible to effectively prevent the teeth piece from coming out radially inward after the yoke portion and each tooth piece are integrated, and to effectively prevent the circumferential wobble of each tooth piece. .

  In addition, an annular member that contacts axial end surfaces on both axial sides of the core is provided, and the annular member forms a boundary surface between the teeth side fitting portion and the yoke side fitting portion over the entire circumference. It is preferable to adopt a configuration in which it is disposed across.

  According to this configuration, since the annular member is disposed across the boundary surface between the teeth-side fitting portion and the yoke-side fitting portion over the entire circumference, each tooth piece is in the axial direction with respect to the yoke portion. Therefore, relative movement to the annular member side can be restricted. Then, by providing such an annular member in contact with the axial end faces on both axial sides of the core, it is possible to prevent each tooth piece from coming off in the axial direction after the yoke portion and each tooth piece are integrated. can do.

  The annular member is preferably made of a magnetic material.

  According to this configuration, the magnetic flux generated by the coil at both axial end portions of the core can be used effectively. Therefore, the energy efficiency of the rotating electrical machine can be improved.

  In addition, it is preferable that the circumferential wall portions on both sides in the circumferential direction of the tooth piece are formed in parallel to each other.

  According to this configuration, the cross-sectional area of the surface perpendicular to the radial direction in each tooth piece is substantially equal over the entire radial direction, so that the magnetic flux density of the magnetic field generated by the field passing through each tooth piece is large. The thickness can be made substantially uniform in the radial direction. Therefore, the energy efficiency of the rotating electrical machine can be improved by increasing the maximum magnetic flux density until magnetic saturation occurs.

  Further, in the configuration in which the circumferential wall portions on both sides in the circumferential direction of the teeth piece are formed in parallel to each other, the linear conductor has a rectangular cross-sectional shape, and a plurality of the above-mentioned slots are provided in each slot. It is preferable that the linear conductors are arranged side by side in the radial direction, and the linear conductors are formed so that the circumferential width is wider and the radial width is narrower as the radial conductors are arranged on the outer side in the radial direction. It is.

When the circumferential wall portions on both sides in the circumferential direction of each tooth piece are formed in parallel to each other, the slot formed between each tooth piece has a cross-sectional shape in a plane orthogonal to the axial direction, and the yoke portion is It becomes a substantially trapezoid shape in which the circumferential width becomes wider toward the radially outer side which is the position. Therefore, according to such a slot shape, by forming the circumferential width of the linear conductors arranged side by side in the radial direction in the slot so that the one arranged on the radially outer side becomes wider, The gap portion in the slot can be reduced, and the space factor of the coil can be improved.
Further, in this case, by forming the radial width so that the radial width is narrower toward the outer side in the radial direction, the axial direction (in the energization direction) of each linear conductor arranged in the radial direction in the slot. The cross-sectional areas of the planes orthogonal to each other can be made substantially equal. Therefore, since the electric resistance value in each linear conductor can be made substantially constant, it is possible to suppress the occurrence of inconvenience such as local increase in the amount of heat generated by Joule heat in the coil.

  Further, it is preferable that the yoke portion has a configuration in which a plurality of divided yoke pieces divided in the circumferential direction are combined in a cylindrical shape.

  According to this configuration, with the teeth pieces inserted in the radial direction between the adjacent coil sides, the yoke portion is relatively inserted in the axial direction so that the yoke-side fitting portion of the yoke portion and each tooth are inserted. When the piece is fitted to the teeth side fitting portion, it can be inserted for each divided yoke piece. Therefore, for example, sliding resistance at the time of insertion can be reduced as compared with the case where the yoke portion integrally formed over the entire circumferential direction is relatively inserted in the axial direction. Therefore, the manufacturability of the armature for a rotating electrical machine as described above can be improved.

  Further, in the configuration in which the yoke portion is constituted by a plurality of divided yoke pieces, the tooth pieces have a symmetrical shape with respect to a center plane imaginary at a circumferential center portion of the tooth pieces, and the divided pieces are provided. The yoke piece is preferably divided at a circumferential position corresponding to the center plane of each tooth piece.

  According to this configuration, the yoke portion and each tooth piece are integrated by sequentially inserting the divided yoke pieces between the circumferentially opposed surfaces of the teeth side fitting portions of the two adjacent tooth pieces. It can be made. At this time, since the sliding resistance at the time of insertion can be greatly reduced, the manufacturability of the rotating electrical machine armature can be further improved.

  In addition, the yoke body portion, which is formed in a substantially C shape with a minute gap between the circumferential end surfaces on both sides in the circumferential direction, abuts the circumferential end surfaces so that the outer edges coincide with each other. It is preferable to adopt a configuration that is fixed and configured in a state where it is in a closed state.

  According to this configuration, with the teeth pieces inserted in the radial direction between the adjacent coil sides, the yoke portion is relatively inserted in the axial direction so that the yoke-side fitting portion of the yoke portion and each tooth are inserted. When fitting with the teeth side fitting part of a piece, in a state where a predetermined assembly clearance exists between the yoke side fitting part of the yoke body part and the teeth side fitting part of each tooth piece by a minute gap The yoke body can be inserted. Therefore, for example, sliding resistance at the time of insertion can be reduced as compared with the case where the yoke portion integrally formed over the entire circumferential direction is relatively inserted in the axial direction. Therefore, the manufacturability of the armature for a rotating electrical machine as described above can be improved.

  In addition, when the axial length of the core constituting the armature for a rotating electrical machine is relatively long, a situation in which sliding resistance at the time of insertion becomes a problem is likely to occur. It is particularly effective to form the yoke portion by using the yoke body portion formed in a letter shape, since such inconvenience can be avoided.

  In addition, it is preferable to have a configuration in which a plurality of teeth pieces are inserted in the radial direction between the adjacent coil side portions of the coil and the yoke portion.

  According to this configuration, as described above, the yoke portion is relatively inserted in the axial direction with respect to the intermediate subunit in which each tooth piece is inserted between the coil side portions adjacent to each other in the radial direction. An armature for a rotating electric machine can be appropriately configured.

  A characteristic configuration of a method for manufacturing an armature for a rotating electrical machine, comprising: a cylindrical core in which a plurality of axially extending slots according to the present invention are distributed in the circumferential direction; and a coil wound around the slot. A plurality of teeth pieces arranged between the plurality of slots, and a cylindrical yoke portion having the same number of yoke-side fitting portions as the teeth pieces, as the core. The coil side portion extending in the axial direction is distributed in the circumferential direction corresponding to the position of the slot, and the outer diameter of at least one coil end portion on the one axial side is the inner diameter of the yoke portion. The coil is formed in advance in a substantially cylindrical shape, and a plurality of teeth pieces are inserted between the coil sides adjacent to each other in the radial direction, and the coil and the plurality of the coils are inserted. An intermediate integration step of forming an intermediate subunit integrated with the teeth piece, and inserting the yoke portion in the axial direction relative to the intermediate subunit, and the yoke side fitting portion and the teeth side And a final integration step in which the plurality of teeth pieces and the yoke portion are integrated by fitting the fitting portions with each other.

  According to the above characteristic configuration, each tooth piece is inserted in the radial direction between adjacent coil side portions of a coil formed in a substantially cylindrical shape in advance in the intermediate integration step. An intermediate subunit in which the coil and each tooth piece are integrated can be formed in a state in which the side fitting portion is arranged facing outward in the radial direction. In addition, since the outer diameter of the coil end portion on at least one axial side of the coil is smaller than the inner diameter of the yoke portion, in that state, the yoke portion is relatively inserted in the axial direction in the final integration step. By fitting the yoke side fitting portion and the teeth side fitting portion of each tooth piece together, the yoke portion and each tooth piece can be integrated. Therefore, according to the above characteristic configuration, for example, the slot of the core is a semi-open slot, and the circumferential width of the conductor constituting the coil is the circumferential direction of the inner peripheral opening of the semi-open slot. Even if it is wider than the width, the coil can be wound around the semi-open slot. Even when the slot of the core is an open slot, the coil can naturally be wound. That is, according to the above-described characteristic configuration, it is possible to manufacture an armature for a rotating electrical machine capable of winding a coil in the slot regardless of the combination of the shape of the slot of the core and the shape of the conductor constituting the coil. it can.

It is sectional drawing which shows the whole structure of the rotary electric machine which concerns on 1st embodiment. It is a perspective view which shows the whole structure of the stator which concerns on 1st embodiment. It is sectional drawing in the cross section orthogonal to the axial direction of the stator which concerns on 1st embodiment. It is the elements on larger scale in FIG. It is a top view of the yoke part which concerns on 1st embodiment. It is sectional drawing in the cross section orthogonal to the axial direction of the intermediate subunit of the stator which concerns on 1st embodiment. It is an axial sectional view of an intermediate subunit of a stator concerning a first embodiment. It is an axial direction sectional view showing one scene of an assembly procedure of a stator concerning a first embodiment. It is an axial sectional view of the stator concerning a first embodiment. It is sectional drawing in the cross section orthogonal to the axial direction of the stator which concerns on 2nd embodiment. It is sectional drawing in the cross section orthogonal to the axial direction of the stator which concerns on 3rd embodiment. It is sectional drawing in the cross section orthogonal to the axial direction of the stator which concerns on 4th embodiment. It is a top view of the yoke part which concerns on other embodiment.

[First embodiment]
A first embodiment of an armature for a rotating electrical machine according to the present invention will be described with reference to the drawings. In the present embodiment, the case where the armature for a rotating electrical machine according to the present invention is applied to the stator 2 of the rotating electrical machine 1 will be described as an example. FIG. 1 is a cross-sectional view illustrating the overall configuration of the rotating electrical machine 1 according to the present embodiment, and FIG. 2 is a perspective view illustrating the overall configuration of the stator 2 according to the present embodiment. In the stator 2 according to this embodiment, the coil 21 is formed in a substantially cylindrical shape in advance, and the stator core 11 is configured to be divided into a yoke portion 31 and a plurality of teeth pieces 41, and these are combined to form the stator 2. It has a feature in that. Thereby, the coil 21 can be wound around the slot 12 regardless of the combination of the shape of the slot 12 included in the stator core 11 and the shape of the conductor constituting the coil 21. Hereinafter, the configuration of each part of the rotating electrical machine 1 will be described in detail.

1. Overall Configuration of Rotating Electric Machine As shown in FIG. 1, the rotating electric machine 1 includes a stator 2, a rotor 3, and a case 5. The stator 2 includes a coil 21, and a magnetic field can be generated by passing a current through the coil 21. In the present embodiment, the stator 2 corresponds to the “armature for rotating electrical machine” in the present invention. The stator 2 is fixed to the inner peripheral surface of the case 5. The configuration of the stator 2 will be described in detail later. Further, a rotor 3 as a field magnet provided with a permanent magnet (not shown) is supported on a radially inner side of the stator 2 so as to be relatively rotatable with respect to the stator 2 with the rotor shaft 4 as a rotation axis. Yes. That is, the rotating electrical machine 1 in this embodiment is an inner rotor type rotating electrical machine including a stator 2 as an armature. The case 5 is formed in a cylindrical shape in which an end wall 5a is provided on one side in the axial direction. The case 5 opens to the other side in the axial direction, and a cover 6 is attached to the case 5 so as to close the opening. And the bearing 7 is provided in the radial direction center part of the end wall 5a of the case 5 and the cover 6, and the rotor 3 and the rotor shaft | axis 4 are rotatably supported with respect to the case 5 and the cover 6 via the bearing 7. FIG. ing.

2. Configuration of Stator As shown in FIG. 2, the stator 2 includes a stator core 11 and a coil 21. The stator core 11 is made of a magnetic material and has a substantially cylindrical shape. On the inner peripheral surface of the stator core 11, a plurality of slots 12 extending in the axial direction are distributed in the circumferential direction and provided at predetermined circumferential intervals. In the present embodiment, the stator core 11 corresponds to a “core” in the present invention. Each slot 12 is formed in the same cross-sectional shape in the cross section in the plane orthogonal to the axial direction. In the present embodiment, the stator core 11 is provided with a total of 48 slots 12 on the entire circumference thereof. In the slot 12 of the stator core 11, a coil 21 of a plurality of phases (in this example, three phases of U phase, V phase, and W phase) is wound with wave winding and distributed winding.

  In the present embodiment, the coil 21 is composed of a linear conductor having a substantially rectangular cross-section in a plane orthogonal to the longitudinal direction (equal to the energization direction). The material constituting this linear conductor can be, for example, copper or aluminum. The surface of the linear conductor is covered with an insulating film made of resin or the like. The coil 21 includes a coil side portion 22 disposed in the slot 12 and a coil end portion 23 that connects the coil side portions 22 disposed in different slots 12 in the circumferential direction at both axial end portions of the stator core 11. , And is configured. Here, each coil side 22 is distributed and arranged at predetermined intervals in the circumferential direction corresponding to the positions of the plurality of slots 12 provided on the inner peripheral surface of the stator core 11, and the coil 21 has a substantially cylindrical shape as a whole. Is formed.

  Each coil side portion 22 is a conductor portion extending linearly in the axial direction in the slot 12 of the stator core 11. The coil end portion 23 has a circumferential conductor portion 26 extending in a substantially arc shape along the circumferential direction, and is bent in the axial direction at both circumferential end portions of the circumferential conductor portion 26 so as to be different from each other. It is continuous with the coil side portion 22 arranged inside. In the present embodiment, the stator 2 is a stator used in the rotating electrical machine 1 driven by a three-phase alternating current, and includes a three-phase coil 21 of U phase, V phase, and W phase. In the following description, each member constituting the coil 21 is shown as a member such as 21u, 21v, and 21w, particularly when it is necessary to distinguish between the U phase, the V phase, and the W phase. The description will be made by adding lower case letters “u”, “v” and “w” after the sign. A substantially cylindrical coil 21 is formed as a whole in a state where these three-phase coils 21u, 21v, and 21w are combined.

  In the present embodiment, as shown in FIG. 2, in the coil end portion 23, circumferential conductor portions 26 for two phases out of the three phases are arranged so as to overlap in the radial direction over the entire circumference. In this example, the circumferential conductor portion 26v constituting the V-phase coil 21v has a radial step portion at the circumferential central portion, and a portion on one side in the circumferential direction has a diameter relative to a portion on the other side in the circumferential direction. It is offset outward in the direction. And the site | part of the circumferential direction other side of the circumferential direction conductor part 26w which comprises the W-phase coil 21w is arrange | positioned in the radial inside of the site | part of the circumferential direction one side of the circumferential direction conductor part 26v which comprises the V-phase coil 21v. Yes. Further, a portion on one side in the circumferential direction of the circumferential conductor portion 26u constituting the U-phase coil 21u is arranged on the radially outer side of the portion on the other circumferential side of the circumferential conductor portion 26v constituting the V-phase coil. . Further, a portion on one side in the circumferential direction of the circumferential conductor portion 26w constituting the W-phase coil 21w is arranged radially inside the portion on the other circumferential side of the circumferential conductor portion 26u constituting the U-phase coil 21u. Yes.

  As shown in FIG. 3, in the present embodiment, the stator core 11 includes a cylindrical yoke portion 31 and a plurality of teeth pieces 41. The yoke portion 31 has a plurality of fitting recesses 35 on the inner peripheral surface side. Each tooth piece 41 has a fitting convex portion 45 protruding outward in the radial direction. Then, when the fitting recess 35 and the fitting projection 45 are fitted, the yoke portion 31 and the plurality of tooth pieces 41 are integrated to form the stator core 11. In addition, the teeth main body 43 of each tooth piece 41 constitutes the tooth 15 in a state where the yoke portion 31 and each tooth piece 41 are integrated. The teeth 15 are formed so as to extend in the axial direction between adjacent slots 12 of the stator core 11.

  As shown in FIG. 4, circumferential protrusions 42 that protrude in the circumferential direction and extend in the axial direction are provided at both ends in the circumferential direction at the radially inner end of each tooth piece 41. Each tooth piece 41 includes circumferential wall portions 44 extending in the axial direction and the radial direction on both sides in the circumferential direction of the tooth main body 43. The circumferential protrusion 42 is formed integrally with the teeth body 43 continuously from the circumferential wall 44. Between two circumferential protrusions 42 formed in adjacent tooth pieces 41 and facing each other in the circumferential direction, an inner circumferential opening 13 that opens radially inward of the slot 12 is formed. In the present embodiment, the circumferential width W1 of the inner circumferential opening 13 of the slot 12 is larger than the circumferential width W3 on the innermost circumferential side inside the slot 12 positioned radially outward from the inner circumferential opening 13. It is narrowly formed. That is, in this embodiment, the slot 12 of the stator core 11 is a semi-open slot. Therefore, when the rotor 3 rotates, the amount by which the magnetic flux from the permanent magnet included in the rotor 3 reaches the surface of the coil side part 22 constituting the coil 21 can be reduced. Therefore, generation | occurrence | production of the eddy current in the surface of the coil side part 22 can be suppressed, and an eddy current loss can be reduced.

  Moreover, in this embodiment, the circumferential direction wall part 44 of the circumferential direction both sides in each teeth piece 41 is formed in parallel with each other. Therefore, in the present embodiment, the cross-sectional shape of the slot 12 in the cross section orthogonal to the axial direction is such that the circumferential width W3 ′ on the outermost circumferential side in the slot 12 is wider than the circumferential width W3 on the innermost circumferential side. It has a substantially trapezoidal shape. In each slot 12 having such a shape, a plurality of coil side portions 22 constituting the coil 21 are arranged side by side in the radial direction (six in this example). In the present embodiment, corresponding to the cross-sectional shape of the slot 12, the linear conductors forming the coil side portions 22 arranged in the radial direction in each slot 12 are arranged on the outer side in the radial direction. As a result, the width in the circumferential direction is increased. Thereby, the energy efficiency of the rotating electrical machine 1 is improved by improving the space factor of the coil 21 in the slot 12.

  Furthermore, in this embodiment, it forms so that radial direction width | variety may become narrow, so that what is arrange | positioned at radial direction outer side. More specifically, for all of the six linear conductors forming the coil side portions 22 arranged side by side in the radial direction, the circumferential width and the cross-sectional area of the surfaces orthogonal to the axial direction are substantially equal. A radial width is set. As a result, when a current is passed through the coil 21, the cross-sectional area in the energizing direction becomes substantially equal for the linear conductors forming all the coil side portions 22, so that the electric resistance value is made substantially constant and the coil 21 is caused by Joule heat. Inconveniences such as local increase in the amount of generated heat are suppressed.

  An insulating sheet 18 is interposed between the slot 12 and the coil side 22. Thereby, the electrical insulation between these is ensured appropriately. As the insulating sheet 18, for example, a sheet formed of a material having high electrical insulation and heat resistance such as a laminate of aramid fiber and polyethylene terephthalate can be used.

  The yoke portion 31 is made of a magnetic material, and as shown in FIG. 5, the yoke portion 31 has a plurality of fitting recesses 35 that retreat outward in the circumferential direction on the inner peripheral surface side, and is formed in a substantially cylindrical shape. Has been. In the present embodiment, corresponding to the total 48 slots 12 being provided on the entire circumference of the stator core 11, the yoke part 31 is provided with a total of 48 fitting recesses 35 on the entire circumference. Yes. As will be described later, since 48 teeth 12 are provided in total corresponding to the 48 slots 12 provided on the entire circumference of the stator core 11, the yoke portion 31 has a fitting. The number of recesses 35 is the same as the number of teeth pieces 41. These fitting recesses 35 are uniformly distributed in the circumferential direction.

  The fitting recess 35 has the same cross-sectional shape of the surface orthogonal to the axial direction over the entire axial direction, and has at least one circumferential protrusion or circumferential recess along the radial direction. ing. That is, the fitting recessed part 35 has a site | part which becomes wide in the circumferential direction toward the radial direction outer side at least (the circumferential direction width becomes narrow toward the radial direction inner side). In the present embodiment, as shown in FIG. 4, the fitting recess 35 has meandering surfaces extending in a wavy shape in the radial direction on both sides in the circumferential direction. Thereby, the fitting recessed part 35 has both the circumferential direction convex part and circumferential direction recessed part along radial direction. The meandering surface is complementary to the meandering surface of the fitting convex portion 45 of each tooth piece 41. Therefore, the fitting concave portion 35 of the yoke portion 31 has a shape that can be moved relative to the fitting convex portion 45 of each tooth piece 41 in the axial direction. In the present embodiment, the fitting recess 35 functions as the “yoke side fitting portion” in the present invention.

  In the present embodiment, the inner diameter of the yoke portion 31 is formed to be larger than the outer diameter of the coil end portion 23 on at least one axial side of the coil 21. In other words, the coil 21 formed in a substantially cylindrical shape is formed such that at least the outer diameter of the coil end portion 23 on one axial side is smaller than the inner diameter of the yoke portion 31. Thereby, the yoke part 31 becomes a structure which can be extrapolated relatively with respect to the coil 21 from an axial direction one side at least.

  Each tooth piece 41 is made of a magnetic material, and has a substantially rectangular parallelepiped shape having a fitting convex portion 45 protruding outward in the radial direction at a radially outer position as shown in FIGS. 3 and 4. It is formed as a small piece. In the present embodiment, a total of 48 teeth pieces 41 are provided corresponding to the total 48 slots 12 being provided on the entire circumference of the stator core 11. As described above, each tooth piece 41 includes the circumferential protrusions 42 that protrude in the circumferential direction and extend in the axial direction on both sides in the circumferential direction at the radially inner end. As described above, each tooth piece 41 includes two circumferential protrusions 42 formed radially inward with respect to the tooth main body 43, and a fitting protrusion 45 formed radially outward. Yes. The circumferential width T3 of the teeth main body 43 is formed to be narrower than the circumferential width T1 between the two circumferential protrusions 42, and the circumferential width T5 of the fitting protrusion 45 is equal to that of the teeth main body 43. It is formed narrower than the circumferential width T3. Here, the circumferential maximum width of the fitting projection 45 is the circumferential width T5 of the fitting projection 45.

  The fitting convex portion 45 has the same cross-sectional shape of the surface orthogonal to the axial direction over the entire axial direction, and has at least one circumferential convex portion or circumferential concave portion along the radial direction. ing. That is, the fitting convex part 45 has a site | part which becomes wide in the circumferential direction toward the radial direction outer side (the circumferential width becomes narrow toward the radial inner side). In the present embodiment, as shown in FIG. 4, the fitting convex portion 45 has meandering surfaces extending in a wavy shape in the radial direction on both sides in the circumferential direction. Thereby, the fitting convex part 45 has both the circumferential direction convex part and circumferential direction recessed part along radial direction. The meandering surface is complementary to the meandering surface of the fitting recess 35 of the yoke portion 31. Therefore, the fitting convex portion 45 of each tooth piece 41 has a shape that can be moved relative to the fitting concave portion 35 of the yoke portion 31 in the axial direction and can be fitted. In the present embodiment, the fitting convex portion 45 functions as the “tooth side fitting portion” in the present invention. Each tooth piece 41 is formed to have a symmetric shape with respect to a center plane M that is assumed at the center in the circumferential direction of each tooth piece 41.

  In the present embodiment, the circumferential width T3 of the teeth body portion 43 of the tooth piece 41 is the circumferential width between the coil side portions 22 arranged adjacent to each other in the circumferential direction in the coil 21 formed in a substantially cylindrical shape. Narrower than that. Therefore, each tooth piece 41 can be inserted in the radial direction between the coil side portions 22 adjacent to each other. However, in this embodiment, since the circumferential width T1 between the two circumferential protrusions 42 of the tooth piece 41 is wider than the circumferential width between the coil side portions 22, each tooth piece 41 is Between the coil side portions 22 adjacent to each other, the fitting convex portion 45 can be inserted only from the radially inner side in a state of facing the radially outer side. Then, the intermediate subunit U is formed in a state in which 48 teeth pieces 41 are inserted from the radially inner side between all the coil side portions 22 arranged adjacent to each other over the entire circumference of the coil 21. (See FIG. 6).

  In the present embodiment, in the intermediate subunit U, each tooth piece 41 is held in a state in which the fitting convex portion 45 projects further radially outward than the radially outer end of the substantially cylindrical coil 21. Yes. As shown in FIG. 3, the yoke portion 31 is fixedly integrated with the intermediate subunit U. That is, it is formed on the inner peripheral surface side of the fitting convex portion 45 and the yoke portion 31 of each tooth piece 41 that protrudes radially outward in the intermediate subunit U and has a shape that can be relatively moved in the axial direction. In a state where the plurality of fitting recesses 35 are fitted, a plurality of teeth pieces 41 are integrated with the yoke portion 31 and are fixed in the radial direction and the circumferential direction, respectively. These are fixed in a state in which the end surfaces on both sides in the axial direction of the yoke portion 31 and the end surfaces on both sides in the axial direction of each tooth piece 41 are located on the same plane, and the stator 2 is configured in this state. Yes.

  As shown in FIGS. 2 and 9, annular members 51 are provided on both axial sides of the stator core 11. The annular member 51 is disposed in contact with the axial end surfaces of the yoke portion 31 and the teeth pieces 41 constituting the stator core 11. Further, the annular member 51 (indicated by a two-dot chain line in FIG. 4) is provided between the fitting concave portion 35 of the yoke portion 31 and the fitting convex portion 45 of each tooth piece 41 over the entire circumference of the stator core 11. Among these boundary surfaces, at least one place in the radial direction is disposed across the boundary surface. In this example, the annular member 51 is disposed across the entire boundary surface between the fitting concave portion 35 of the yoke portion 31 and the fitting convex portion 45 of each tooth piece 41. Such an annular member 51 functions as an axial movement restricting means for restricting relative movement in the axial direction between the yoke portion 31 and each tooth piece 41. By providing such annular members 51 on both sides in the axial direction, the tooth pieces 41 are prevented from coming off in the axial direction after the yoke portion 31 and the tooth pieces 41 are integrated.

  Here, in the present embodiment, the annular member 51 is made of a magnetic material. In this example, the annular member 51 is configured by laminating a plurality of annular plate-shaped electromagnetic steel plates. Thus, by forming the annular member 51 using a magnetic material, not only the magnetic flux generated by the coil side portion 22 constituting the coil 21 but also the coil end portion 23 is generated at both axial end portions of the stator core 11. Magnetic flux can also be used effectively. Therefore, since a larger magnet torque can be generated between the permanent magnets provided in the rotor 3, the energy efficiency of the rotating electrical machine 1 can be improved.

3. Next, a method for manufacturing the stator 2 according to this embodiment will be described. The stator 2 according to this embodiment includes a coil forming process, an intermediate integration process, and a final integration process, and can be manufactured through these processes. Below, these each process is demonstrated in detail.

  The coil forming step is a step of forming the coil 21 of each phase in advance. In the coil forming step, a single linear conductor having a substantially rectangular cross section is used, and a coil 21u, 21v, 21w of each phase having a predetermined shape is formed using a predetermined coil forming jig (not shown). It is formed. In a state where the coils 21u, 21v, 21w of each phase are combined, the coil side portions 22 extending in the axial direction are distributed and arranged in the circumferential direction corresponding to the positions of the slots 12 of the stator core 11. The substantially cylindrical coil 21 is formed. At this time, the outer diameter of the coil end portion 23 on at least one axial side of the coil 21 is formed to be smaller than the inner diameter of the yoke portion 31.

  The intermediate integration step is a step of forming the intermediate subunit U by integrating the coil 21 and the plurality of tooth pieces 41. As shown in FIGS. 6 and 7, in the intermediate integration step, a plurality of tooth pieces 41 are inserted in the radial direction between the coil side portions 22 adjacent to each other in the coil 21, and the coil 21 and the plurality of tooth pieces 41 are Is formed as an intermediate subunit U. Each tooth piece 41 is inserted from the radially inner side to the radially outer side between adjacent coil side portions 22 of the substantially cylindrical coil 21 with the fitting convex portion 45 facing the radially outer side. . The intermediate subunit U is formed in a state where all the teeth pieces 41 are inserted. In the intermediate subunit U, each tooth piece 41 is held in a state in which the fitting convex portion 45 projects further radially outward than the radially outer end of the substantially cylindrical coil 21.

  The final integration step is a step of forming the stator 2 by integrating the intermediate subunit U and the yoke portion 31. As shown in FIG. 8, in the final integration step, the yoke portion 31 is inserted relative to the intermediate subunit U in the axial direction, and the fitting recess 35 of the yoke portion 31 and the fitting protrusion of each tooth piece 41 are inserted. The portion 45 is fitted to each other, and the yoke portion 31 and the plurality of teeth pieces 41 are integrated. As described above, the outer diameter of at least one coil end portion 23 in the axial direction of the coil 21 is formed to be smaller than the inner diameter of the yoke portion 31. In this example, the outer diameters of the coil end portions 23 on both axial sides are smaller than the inner diameter of the yoke portion 31. Further, the fitting concave portion 35 of the yoke 31 and the fitting convex portion 45 of each tooth piece 41 are formed so that the cross-sectional shapes of the surfaces orthogonal to the axial direction are the same over the entire axial direction, and are complementary to each other. It has a meandering surface. Therefore, when the yoke portion 31 moves relative to the intermediate subunit U in the axial direction, the yoke portion 31 and the coil 21, and the fitting recess 35 and the fitting projection 45 do not interfere with each other. Accordingly, the stator 2 can be formed by appropriately inserting the yoke portion 31 relative to the intermediate subunit U in the axial direction.

  The yoke portion 31 is inserted until the end surfaces on both sides in the axial direction of the yoke portion 31 and the end surfaces on both sides in the axial direction of the teeth pieces 41 are in the same plane. In this state, as shown in FIG. 9, the annular member 51 is arranged in contact with the axial end surfaces of both the yoke portion 31 and each tooth piece 41 constituting the stator core 11 on both axial sides of the stator core 11. The The annular member 51 is disposed over the entire circumference of the stator core 11 so as to straddle the respective boundary surfaces between the fitting concave portion 35 of the yoke portion 31 and the fitting convex portion 45 of each tooth piece 41. This prevents the teeth 41 from coming off from the yoke portion 31 in the axial direction. The stator 2 is manufactured through the steps as described above.

  As described above, in the stator 2 according to the present embodiment, the coil 21 formed in a substantially cylindrical shape in advance so that the outer diameter of at least the coil end portion 23 on one axial side is smaller than the inner diameter of the yoke portion 31. Each tooth piece 41 is inserted between the coil side portions 22 adjacent to each other in the radial direction. The coil 21 and each tooth piece are arranged in a state in which the fitting convex portion 45 of each tooth piece 41 is positioned further radially outward than the radially outer end of the coil end portion 23 of the coil 21. An intermediate subunit U integrated with 41 is formed. In this state, the yoke portion 31 is inserted relative to the intermediate subunit U in the axial direction so that the fitting concave portion 35 of the yoke portion 31 and the fitting convex portion 45 of each tooth piece 41 are fitted to each other. Thereby, the yoke part 31 and each teeth piece 41 can be integrated.

  That is, in the stator 2 according to the present embodiment, at least the outer diameter of the coil end portion 23 on one side in the axial direction is formed smaller than the inner diameter of the yoke portion 31. Can be inserted relatively. At that time, the fitting concave portion 35 of the yoke portion 31 and the fitting convex portion 45 of the teeth piece 41 have a shape that can be fitted by moving relative to each other in the axial direction. 22, with each tooth piece 41 inserted in the radial direction with the fitting convex portion 45 of the tooth piece 41 facing radially outward, the fitting convexity of the fitting concave portion 35 of the yoke portion 31 and each tooth piece 41. The yoke part 31 and each tooth piece 41 can be integrated by relatively moving the part 45 in the axial direction and fitting. Therefore, regardless of the combination of the shape of the slot 12 included in the stator core 11 and the shape of the linear conductor constituting the coil 21, the coil 21 can be reliably wound in the slot 12.

In particular, in this embodiment, the slot 12 of the stator core 11 is a semi-open slot, and the circumferential width of the linear conductor constituting the coil 21 is the circumferential width of the inner circumferential opening 13 of the slot 12. It is wider than W1. Therefore, if the stator 2 is configured using the stator core 11 in which the yoke portion 31 and the teeth 15 are completely integrated, it is very difficult to wind the coil 21 around the semi-open slot 12. is there. That is, since the circumferential protrusion 42 in each tooth 15 interferes with the linear conductor constituting the coil 21, the coil 21 cannot be inserted into each slot 12 both in the radial direction and in the axial direction.
On the other hand, in the stator 2 according to the present embodiment, the slot 12 and the combination of the linear conductors can be combined even if the combination of the slot 12 and the linear conductor is as described above by devising the configuration of the stator core 11 and the assembly procedure thereof. The coil 21 can be surely wound in the inside 12.

[Second Embodiment]
A second embodiment of an armature for a rotating electrical machine according to the present invention will be described with reference to the drawings. Also in this embodiment, the armature for rotating electrical machines according to the present invention is applied to the stator 2 of the inner rotor type rotating electrical machine 1. However, in this embodiment, the structure of the yoke part 31 which comprises the stator core 11 is different from said 1st embodiment. Hereinafter, the stator 2 according to the present embodiment will be described mainly focusing on the differences from the first embodiment. Note that points not particularly specified are the same as in the first embodiment.

  As shown in FIG. 10, in the present embodiment, the yoke portion 31 is configured by combining a plurality of divided yoke pieces 61 divided in the circumferential direction into a cylindrical shape. In the present embodiment, a total of 48 divided yoke pieces 61 are combined in a cylindrical shape corresponding to the number of teeth pieces 41. Also in the present embodiment, each tooth piece 41 is formed to have a symmetric shape with respect to the center plane M that is assumed at the center in the circumferential direction. Each divided yoke piece 61 is divided at a circumferential position corresponding to the center plane M of each tooth piece 41. That is, the yoke portion 31 is evenly divided in the circumferential direction in a state where the divided surfaces 62 on both sides in the circumferential direction of the divided yoke piece 61 and the center plane M of the teeth piece 41 are located on the same plane. In this case, each divided yoke piece 61 has meandering surfaces extending in a wavy shape in the radial direction on both sides in the circumferential direction. The two meandering surfaces facing each other in the circumferential direction between the adjacent divided yoke pieces 61 are combined to form a fitting recess 35 as a yoke-side fitting portion. Each divided yoke piece 61 is fixed integrally with a core holder 63 relatively inserted in a state where the divided yoke pieces 61 adjacent to each other are brought into contact with the circumferentially facing divided surfaces 62 and combined in a cylindrical shape. It has become.

  By the way, when the entire yoke portion 31 is integrally formed as in the first embodiment, when the yoke portion 31 is inserted relative to the intermediate subunit U in the axial direction, The sliding resistance between the inner peripheral surface of the fitting concave portion 35 of the yoke portion 31 and the outer peripheral surface of the fitting convex portion 45 of each tooth piece may increase, making it difficult to insert in the axial direction. Such a situation where sliding resistance becomes a problem is likely to occur as the axial length of the stator core 11 increases. In the stator 2 according to the present embodiment, since the yoke portion 31 is configured by combining a plurality of divided yoke pieces 61 divided in the circumferential direction, relative to the intermediate subunit U in the axial direction for each divided yoke piece 61. Can be inserted. Therefore, the surface area of the sliding surface per insertion can be reduced as compared with the case where the entire yoke portion 31 is integrally formed, so that the sliding resistance at the time of insertion is reduced, and the stator 2 Manufacturability can be improved.

  In the present embodiment, each divided yoke piece 61 is divided at a circumferential position corresponding to the center plane M of each tooth piece 41. In such a configuration, each divided yoke piece 61 is inserted between the meandering surfaces opposed to each other in the circumferential direction of the fitting convex portion 45 of the two tooth pieces 41 adjacent to each other. Each tooth piece 41 can be integrated. At this time, since the surface area of the sliding surface per insertion can be made extremely small, the sliding resistance at the time of insertion can be greatly reduced, and the manufacturability of the stator 2 can be further improved. .

  Also in this embodiment, annular members 51 are provided on both axial sides of the stator core 11 (not shown). The annular member 51 is arranged in contact with the axial end surfaces of the respective divided yoke pieces 61 and the respective tooth pieces 41 constituting the stator core 11. In this example, the annular member 51 is disposed across all of the boundary surfaces between the divided yoke piece 61 and each tooth piece 41. Such an annular member 51 serves as an axial movement restricting means for restricting relative movement in the axial direction between each divided yoke piece 61 and each tooth piece 41. By providing such annular members 51 on both sides in the axial direction, the divided yoke pieces 61 and the tooth pieces 41 can be removed in the axial direction after the divided yoke pieces 61 and the tooth pieces 41 are integrated. It is prevented.

[Third embodiment]
A third embodiment of the armature for a rotating electrical machine according to the present invention will be described with reference to the drawings. Also in this embodiment, the armature for rotating electrical machines according to the present invention is applied to the stator 2 of the inner rotor type rotating electrical machine 1. However, in the present embodiment, the configurations of the coil 21 and the stator core 11 are different from those of the first embodiment. Hereinafter, the stator 2 according to the present embodiment will be described mainly focusing on the differences from the first embodiment. Note that points not particularly specified are the same as in the first embodiment.

  In the present embodiment, as shown in FIG. 11, the two coil side portions 22 constituting the coil 21 of the same phase are arranged adjacent to each other without a gap in the circumferential direction. In addition, a set of two coil sides 22 constituting the coils 21 of different phases are arranged adjacent to each other with a predetermined interval in the circumferential direction. The predetermined circumferential interval at this time is substantially equal to the circumferential width T3 of the teeth body portion of each tooth piece 41.

  Corresponding to the shape of the coil 21, in this embodiment, the number of slots 12 included in the stator core 11 is smaller than that in the first embodiment. That is, in the coil 21 having the above-described shape, a set of two coil sides 22 constituting the coil 21 of the same phase arranged adjacent to each other in the circumferential direction are arranged together in one slot 12, The number of slots 12 included in the stator core 11 is half that of the first embodiment. Specifically, the stator core 11 is provided with a total of 24 slots 12 on the entire circumference thereof. Correspondingly, the total number of teeth 41 is 24. The circumferential width T3 of the teeth main body 43 of the tooth piece 41 is about twice that of the first embodiment.

  The stator 2 having such a configuration can also enjoy various merits described in the first embodiment. Further, in the configuration of the present embodiment, as the number of the tooth pieces 41 is halved compared to the first embodiment, the yoke portion 31 is further relatively moved in the axial direction with respect to the intermediate subunit U. Since the surface area of the sliding surface at the time of insertion is small, the sliding resistance at the time of insertion can be reduced and the manufacturability of the stator 2 can be improved. Further, in each slot 12, it is possible to reduce the absolute amount of the insulating sheet 18 that is interposed between the side conductors 22 constituting the coil 21, thereby reducing the manufacturing cost. It is possible.

[Fourth embodiment]
A fourth embodiment of an armature for a rotating electrical machine according to the present invention will be described with reference to the drawings. Also in this embodiment, the armature for rotating electrical machines according to the present invention is applied to the stator 2 of the inner rotor type rotating electrical machine 1. However, in this embodiment, the fitting structure between the yoke part 31 and each tooth piece 41 is different from the first embodiment. Along with this, the shape of the coil 21 formed in a substantially cylindrical shape in advance is also partially different from that of the first embodiment. Hereinafter, the stator 2 according to the present embodiment will be described mainly focusing on the differences from the first embodiment. Note that points not particularly specified are the same as in the first embodiment.

  In the present embodiment, as shown in FIG. 12, the yoke portion 31 has a plurality of fitting convex portions 36 that protrude radially inward on the inner peripheral surface side, and is formed in a substantially cylindrical shape. . In the present embodiment, the yoke portion 31 is provided with a total of 48 fitting convex portions 36 on the entire circumference thereof. The number of fitting convex portions 36 included in the yoke portion 31 is the same as the number of teeth pieces 41. These fitting convex parts 36 are uniformly distributed in the circumferential direction. In the present embodiment, the fitting convex portion 36 has meandering surfaces extending in a wavy shape in the radial direction on both sides in the circumferential direction. Thereby, the fitting convex part 36 has both the circumferential direction convex part and circumferential direction recessed part along radial direction. The meandering surface is complementary to the meandering surface of the fitting recess 46 of each tooth piece 41. Therefore, the fitting convex part 36 of the yoke part 31 becomes a shape which can be relatively moved and fitted to the fitting concave part 46 of each teeth piece 41 in the axial direction. In the present embodiment, the fitting convex portion 36 functions as the “yoke side fitting portion” in the present invention.

  As shown in FIG. 12, each tooth piece 41 is formed as a substantially rectangular parallelepiped small piece having a fitting recess 46 that retreats radially inward at a radially outer position. In the present embodiment, a total of 48 teeth pieces 41 are provided. Each tooth piece 41 is provided with a circumferential protrusion 42 that protrudes in the circumferential direction and extends in the axial direction on both sides in the circumferential direction at the radially inner end. Thus, each tooth piece 41 includes two circumferential protrusions 42 formed radially inward with respect to the tooth main body 43 and a fitting recess 46 formed radially outward. . And the circumferential width T3 of the teeth main-body part 43 is formed narrower than the circumferential width T1 between the two circumferential protrusions 42.

  In the present embodiment, the fitting recess 46 has meandering surfaces extending in a wavy shape in the radial direction on both sides in the circumferential direction. Thereby, the fitting recessed part 46 has both the circumferential direction convex part and circumferential direction recessed part along radial direction. The meandering surface is complementary to the meandering surface of the fitting convex portion 36 of the yoke portion 31. Therefore, the fitting concave portion 46 of each tooth piece 41 has a shape that can be moved relative to the fitting convex portion 36 of the yoke portion 31 in the axial direction. In the present embodiment, the fitting recess 46 functions as the “tooth side fitting portion” in the present invention.

  Also in the present embodiment, each tooth piece 41 can be inserted from the radially inner side between the adjacent coil side portions 22 with the fitting recess 46 facing the radially outer side. Then, the intermediate subunit U is formed in a state in which 48 teeth pieces 41 are inserted from the radially inner side between all the coil side portions 22 arranged adjacent to each other over the entire circumference of the coil 21. ing. In the intermediate subunit U according to the present embodiment, since the “tooth side fitting portion” of each tooth piece 41 is formed as a fitting recess 46, the fitting recess 46 is formed of the substantially cylindrical coil 21. It is held in a state of being positioned radially inward from the radially outer end. Therefore, in order to enable the yoke portion 31 to be relatively inserted and fixed integrally with the intermediate subunit U in the axial direction, one side of the coil 21 in the axial direction (the inner diameter of the yoke portion 31 is larger than that). The coil end portion 23 on the smaller outer diameter side has a shape bent radially inward.

  That is, as shown by a one-dot chain line in FIG. 12, the coil end portion 23 constituting the coil 21 of each phase includes a radial conductor portion 25 extending in the radial direction and a circumferential conductor portion 26 extending in the circumferential direction. Has been. The radial conductor portion 25 is a conductor portion that continues from the coil side portion 22 disposed in the slot 12 and extends from the radially outer side toward the radially inner side on the axially outer side of the stator core 11. The circumferential conductor portion 26 is a conductor portion that extends in the circumferential direction continuously between two radial conductor portions 25 that are continuous from the coil side portions 22 disposed in different slots 12. The circumferential conductor portion 26 is disposed at least on the radially inner side of the radially inner end of the fitting convex portion 36 of the yoke portion 31. In the present example, the circumferential conductor portion 26 is disposed further radially inward than the radially inner end of each tooth piece 41.

  By adopting such a shape of the coil 21, when the yoke portion 31 moves relative to the intermediate subunit U in the axial direction, each fitting convex portion 36 of the yoke portion 31 has a circumferential conductor portion. It passes through a space formed between the radial conductor portions 25 that are radially outer than 26 and adjacent to each other in the circumferential direction. Therefore, the yoke part 31 and the coil 21 (particularly, the fitting convex part 36 and the circumferential conductor part 26 constituting the coil end part 23) do not interfere with each other. Accordingly, the stator 2 can be formed by appropriately inserting the yoke portion 31 relative to the intermediate subunit U in the axial direction.

[Other Embodiments]
(1) In the first to third embodiments, the fitting concave portion 35 of the yoke portion 31 and the fitting convex portion 45 of each tooth piece 41 are complementary to each other in a radial shape on both sides in the circumferential direction. The case where it has the meandering surface of various shapes was demonstrated as an example. Further, in the fourth embodiment, the fitting convex portion 36 of the yoke portion 31 and the fitting concave portion 46 of each tooth piece 41 have a meandering shape complementary to each other and extend radially in the circumferential direction on both sides. The case of having a surface has been described as an example. However, the embodiment of the present invention is not limited to this. That is, the yoke portion 31 has a shape that allows the portion that functions as the “yoke side fitting portion” and the portion that functions as the “tooth side fitting portion” in each tooth piece 41 to move relative to each other in the axial direction. In addition, it is only necessary that each tooth piece 41 is fixed in the radial direction and the circumferential direction with respect to the yoke portion 31 in a state in which they are fitted, and the specific shape thereof can be arbitrarily set.
In this case, for example, the fitting concave portion 35 and the fitting convex portion 45, or the fitting convex portion 36 and the fitting concave portion 46 are at least one place in the radial direction, and the circumferential convex portion and the circumferential concave portion having complementary shapes to each other. If it is set as the structure which has at least one of this, Since the boundary surface of the fitting recessed part 35 and the fitting convex part 45 or the fitting convex part 36 and the fitting recessed part 46 will have a part which diameter expands toward a radial direction outer side. Further, it is possible to effectively prevent each tooth piece 41 from coming out radially inward after the yoke portion 31 and each tooth piece 41 are integrated.

(2) In each of the above embodiments, the case where the slot 12 of the stator core 11 is a semi-open slot has been described as an example. However, the embodiment of the present invention is not limited to this. In other words, one preferred embodiment of the present invention is a so-called open slot in which the circumferential width W1 of the inner circumferential opening 13 in each slot 12 is substantially equal to the circumferential width W3 inside the slot. It is. In this case, since each tooth piece 41 does not include the circumferential protrusion 42 at the radially inner end, each tooth piece 41 is fitted between the adjacent coil side portions 22 with the fitting protrusion 45 or the fitting. It is also possible to insert the concavity 46 from the outside in the radial direction with the radially outward side facing the outside.

(3) In the above embodiments, the case where the circumferential wall portions 44 on both sides in the circumferential direction of each tooth piece 41 are formed in parallel with each other has been described as an example. However, the embodiment of the present invention is not limited to this. That is, if each tooth piece 41 can be inserted in the radial direction between the coil side portions 22 adjacent to each other with the fitting convex portion 45 facing radially outward, for example, the circumferential width of the teeth main body portion 43 is increased. It is also one of preferred embodiments of the present invention that the circumferential wall portions 44 on both sides in the circumferential direction of each tooth piece 41 are formed so as to become narrower toward the radially outer side.

(4) In the second embodiment, the yoke portion 31 is configured by combining the divided yoke pieces 61 divided into a total of 48 pieces in the circumferential direction corresponding to the number of the tooth pieces 41 into a cylindrical shape. An example has been described. However, the embodiment of the present invention is not limited to this. That is, for example, it is also preferable that the yoke portion 31 is configured by combining the divided yoke pieces 61 divided into a plurality of pieces, for example, 24 pieces, 16 pieces, 12 pieces, 8 pieces, and the like into a cylindrical shape. This is one of the embodiments. In this case, the yoke part 31 may be equally divided in the circumferential direction, and the respective divided yoke pieces 61 may be formed in the same shape, and the yoke part 31 is divided unevenly in the circumferential direction so that each divided yoke piece 61 is divided. A part or all of these may be formed in different shapes.

(5) In the first, third, and fourth embodiments, the case where the entire yoke portion 31 is integrally formed has been described as an example. Moreover, in said 2nd embodiment, the case where the yoke part 31 was comprised by combining the some division | segmentation yoke piece 61 in the cylindrical shape was demonstrated as an example. However, the embodiment of the present invention is not limited to this. That is, for example, as shown in FIG. 13, a yoke body 33 formed in a substantially C shape with a minute gap g between circumferential end faces 66 on both sides in the circumferential direction is used. In another preferred embodiment of the present invention, the yoke portion 31 is configured by fixing the direction end faces 66 so that the outer edges are in contact with each other. If such a configuration is adopted, the yoke main body 33 is relatively inserted in the axial direction with the teeth pieces 41 inserted in the radial direction between the coil side portions 22 adjacent to each other. When the fitting projection 35 and the fitting recess 45 of each tooth piece 41 are fitted, a predetermined assembly clearance exists between the fitting projection 35 and the fitting recess 45 due to the minute gap g. The yoke main body 33 can be inserted. Therefore, as compared with the case where the yoke portion 31 integrally formed over the entire circumferential direction as in the first, third and fourth embodiments is relatively inserted in the axial direction, the second Similar to the embodiment, the sliding resistance at the time of insertion can be reduced. Therefore, the manufacturability of the stator 2 can be improved even with such a configuration.

(6) In the fourth embodiment, the case where the circumferential conductor portion 26 is arranged further radially inward than the radially inner end of each tooth piece 41 has been described as an example. However, the embodiment of the present invention is not limited to this. That is, if the circumferential conductor portion 26 is disposed at least radially inward from the radially inner end of the fitting convex portion 36 of the yoke portion 31, the yoke portion 31 is pivoted with respect to the intermediate subunit U. Since the fitting convex part 36 of the yoke part 31 and the circumferential conductor part 26 constituting the coil end part 23 do not interfere with each other in the relative movement in the direction, the circumferential conductor part 26 is, for example, viewed from the axial direction. It is also one of preferred embodiments of the present invention to be arranged at a position that partially overlaps with the radially inner portion.

(7) In each of the above-described embodiments, the case where the substantially cylindrical coil 21 having a predetermined shape is formed in the coil forming process and the stator 2 is manufactured using the coil 21 has been described as an example. However, the embodiment of the present invention is not limited to this. That is, a configuration in which the substantially cylindrical coil 21 formed in a predetermined shape in advance is separately obtained and the stator 2 is manufactured through the intermediate integration process and the final integration process using the coil 21 may be used. It is one of the preferred embodiments of the invention.

(8) In the above embodiment, the armature for a rotating electrical machine according to the present invention is applied to the stator 2 of the rotating electrical machine 1, and the inner rotor type rotating electrical machine includes the stator 2 as the armature. The case described above is described as an example. However, the embodiment of the present invention is not limited to this. That is, for example, the armature for a rotating electrical machine according to the present invention is applied to the rotor of the rotating electrical machine 1, and the rotating electrical machine 1 can be an outer rotor type rotating electrical machine having a rotor as an armature. This is one of the preferred embodiments. Of course, even in this case, in each of the above-described embodiments, it is possible to incorporate some additional techniques described as examples of suitable configurations.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used for an armature for a rotating electrical machine including a cylindrical core in which a plurality of axially extending slots are distributed in the circumferential direction and a coil wound around the slot. it can.

1 Rotating electrical machine 2 Stator (armature)
11 Stator core (core)
12 Slot 13 Inner peripheral opening portion 21 Coil 23 Coil end portion 31 Yoke portion 33 Yoke body portion 35 Fitting recess (yoke side fitting portion)
36 Fitting convex part (yoke side fitting part)
41 Teeth piece 44 Circumferential wall part 45 Fitting convex part (teeth side fitting part)
46 Fitting convex part (tooth side fitting part)
51 annular member 61 divided yoke piece 66 circumferential end face U intermediate subunit M central face g minute gap

Claims (14)

A rotary electric machine armature comprising: a cylindrical core in which a plurality of slots extending in the axial direction are distributed in the circumferential direction; and a coil wound around the slot,
The core includes teeth-side fitting portions, and includes a plurality of teeth pieces arranged between the plurality of slots, and a cylindrical yoke portion having the same number of yoke-side fitting portions as the teeth pieces. ,
The coil is formed in a substantially cylindrical shape by distributing a plurality of coil side portions arranged in the slot in the circumferential direction, and at least the outer diameter of the coil end portion on one axial side is equal to that of the yoke portion. Formed smaller than the inner diameter,
The teeth pieces are formed so as to be insertable in a radial direction between the adjacent coil sides,
The yoke-side fitting portion and the teeth-side fitting portion have a shape that can be relatively moved and fitted in the axial direction, and a plurality of the teeth pieces are attached to the yoke portion in a state in which these are fitted. An armature for a rotating electrical machine fixed in a radial direction and a circumferential direction. Either one of the teeth side fitting portion and the yoke side fitting portion is a fitting convex portion, and either one is a fitting concave portion,
The fitting convex part and the fitting concave part have the same cross-sectional shape across the entire axial direction, and at least one circumferential convex part or circumferential concave part along the radial direction. The armature for rotary electric machines according to claim 1, which is provided at a location.   The armature for a rotating electrical machine according to claim 2, wherein the teeth side fitting portion is a fitting convex portion and the yoke side fitting portion is a fitting concave portion.   4. The armature for a rotating electrical machine according to claim 1, wherein the teeth side fitting portion and the yoke side fitting portion have meandering surfaces complementary to each other extending in a wavy shape in a radial direction. The slot is formed such that the circumferential width of the inner circumferential opening that opens radially inward is narrower than the circumferential width of the slot located radially outside of the inner circumferential opening,
5. The armature for a rotating electrical machine according to claim 1, wherein the linear conductor constituting the coil has a circumferential width wider than a circumferential width of the inner circumferential opening. 6. An annular member that contacts the axial end faces on both axial sides of the core;
The rotation according to any one of claims 1 to 5, wherein the annular member is disposed across the boundary surface between the teeth side fitting portion and the yoke side fitting portion over the entire circumference. Armature for electric machine.   The armature for a rotating electrical machine according to claim 6, wherein the annular member is made of a magnetic material.   The armature for rotary electric machines as described in any one of Claim 1 to 7 in which the circumferential direction wall part of the circumferential direction both sides in the said teeth piece is mutually formed in parallel. The linear conductor has a rectangular cross-sectional shape,
In each of the slots, a plurality of the linear conductors are arranged side by side in the radial direction, and the linear conductor is wider in the circumferential direction and narrower in the radial direction as it is arranged on the outer side in the radial direction. The armature for a rotating electrical machine according to claim 8, which is formed as described above.   The armature for a rotating electrical machine according to any one of claims 1 to 9, wherein the yoke portion is configured by combining a plurality of divided yoke pieces divided in a circumferential direction into a cylindrical shape. The teeth piece has a symmetrical shape with respect to a central plane imaginary at the circumferential center of the teeth piece,
The armature for a rotating electrical machine according to claim 10, wherein the divided yoke piece is divided at a circumferential position corresponding to the central surface of each tooth piece.   The yoke body is formed in a substantially C shape with a minute gap between the circumferential end faces on both sides in the circumferential direction, and the circumferential end faces are in contact with each other so that the outer edges coincide with each other. The armature for rotating electrical machines according to any one of claims 1 to 9, wherein the armature is configured to be fixed by the armature. An intermediate subunit in which a plurality of teeth pieces are inserted in the radial direction between the coil sides adjacent to each other of the coil;
The yoke portion;
The armature for a rotating electrical machine according to any one of claims 1 to 12, wherein: A method of manufacturing an armature for a rotating electrical machine, comprising: a cylindrical core in which a plurality of slots extending in the axial direction are distributed in the circumferential direction; and a coil wound around the slot.
The core includes teeth-side fitting portions, and includes a plurality of teeth pieces disposed between the plurality of slots, and a cylindrical yoke portion having the same number of yoke-side fitting portions as the teeth pieces. And using the core
The coil side portions extending in the axial direction are distributed in the circumferential direction corresponding to the positions of the slots, and at least the outer diameter of the coil end portion on one axial side is smaller than the inner diameter of the yoke portion, Using a coil formed in a substantially cylindrical shape in advance,
An intermediate integration step of inserting a plurality of teeth pieces in a radial direction between adjacent coil sides of the coil to form an intermediate subunit in which the coils and the plurality of teeth pieces are integrated; ,
The yoke portion is inserted in the axial direction relative to the intermediate subunit, and the yoke-side fitting portion and the teeth-side fitting portion are fitted to each other to form a plurality of teeth pieces and the yoke portions. The final integration process to integrate
The manufacturing method of the armature for rotary electric machines provided with.

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