JP2006060880A - Armature for rotating electrical machine, armature winding, winding method of winding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an armature winding for rotary electric machines, an armature, and a wire winding method for armature winding wherein the lead-out portion of one winding portion does not interfere with the coil end portion of another winding portion and the amount of protrusion of the coil ends from an end face of a core can be reduced to reduce the size of a rotary electric machine. <P>SOLUTION: The armature is constructed of an armature core 35 in which multiple slots 36a and 36b are formed and armature windings housed in two lines in the slots in the circumferential direction. The spiral first winding portion 42 that constitutes a winding portion 40 equivalent to one pole includes: a first lead-out portion 46 that is extended from the outermost circumferential layer of one straight portion housed in the first line in the first slot 36a of the armature core toward one end face 37a of the armature core; and a first extended portion 47 that is protruded from the innermost circumferential layer of the other straight portion housed in the second slot toward one end face. The second winding portion includes: a second lead-out portion 56 that is extended from the outermost circumferential layer of the other straight portion housed in the second slot toward the one end face 37a of the armature core; and a second extended portion 57 that is protruded from the innermost circumferential layer of the one straight portion housed in the first slot toward the one end face, and is connected with the first extended portion to form a line-to-line joining portion 50. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an armature for a rotating electric machine, and more particularly to an improvement of an armature winding thereof.

  In recent years, electric vehicles and hybrid vehicles are equipped with high-voltage power supplies. Therefore, an armature and an armature winding that can be highly efficient with a high voltage specification are desired for a rotating electrical machine (for example, an air conditioning compressor motor or an axle drive motor). In order to achieve high efficiency, it is effective to reduce the resistance loss by increasing the conductor cross-sectional area of the armature winding. For this purpose, a winding that can increase the space factor in the slot of the armature is effective. desirable. Such an armature winding contributes to miniaturization of the rotating electric machine.

  FIGS. 13, 14 and 15 show a first conventional armature winding (see Patent Document 1). The winding portion 300 of the armature winding (hereinafter referred to as “winding”) is formed of a flat conductor capable of increasing the cross-sectional area of the conductor, and includes a pair of straight linear coil portions 302 and 303 and coil end portions 305 at both ends thereof. 315. A pair of linear coil portions 302 and 303 are accommodated in slots of an armature core (not shown), and one coil end portion 305 and the other coil end portion 310 are respectively one end surface and the other end surface of the armature core (hereinafter referred to as “iron core”). Protruding from.

On the other hand, the coil end portion 305 extends from the inner peripheral end, inclined portions 306 and 307 that are inclined in opposite directions and connected to the linear coil portions 302 and 303, a vertical connecting portion 308 that connects both inclined portions substantially vertically, and the like. A first lead portion 309 and a second lead portion 310 extending from the outer peripheral end. The other coil end portion 315 has inclined portions 316 and 317 similar to the one coil end portion 305 and a vertical connecting portion 318. Since the winding portion 300 is made of a rectangular conductor, the cross section can be exactly accommodated in a rectangular slot elongated in the radial direction, and the space factor is increased.
JP 2001-45688

  However, the first lead wire 309 passes through the side of the vertical connecting portion 308 (crosses) at the coil end portion 305. For this reason, when the number of slots in each phase of the iron core is large and the slot width is small, that is, the width of the teeth is narrow, adjacent one coil end portions 305 are densely packed, and the first lead wire 309 of a certain winding 300 is separated. It becomes easy to interfere with the vertical connection part 308 of the winding 300 of the coil.

  If the inclinations of the inclined portions 306 and 307 are made gentle, the interval between the adjacent vertical connecting portions 308 is widened, so that interference can be prevented to some extent. However, in this case, the length of the armature in the axial direction becomes longer due to an increase in the amount of protrusion of the coil end portion 305 from the end surface of the iron core, and it is difficult to reduce the size of the armature.

  The present invention has been made in view of the above circumstances, and the lead-out portion of one winding portion does not interfere with the coil end portion of another winding portion, and the amount of protrusion of the coil end portion from the end surface of the iron core is reduced. It is an object of the present invention to provide an armature winding for a rotating electrical machine, an armature, and a winding method of the armature winding that can reduce the size of the rotating electrical machine.

  The inventor of the present application configures the winding portion of the armature winding by two winding portions, starts winding from the outermost peripheral layer of the first winding portion, finishes winding at the outermost peripheral layer of the second winding portion, The present invention has been completed with the idea of connecting the inner peripheral end of one winding portion and the inner peripheral end of the second winding portion with an inter-column connecting portion.

  (1) The armature winding according to the first aspect of the present invention is an armature winding mounted on the armature as described in claim 1, wherein both winding portions for one pole are spiral-shaped. It consists of one winding part and a second winding part. The first winding portion includes one straight portion and the other straight portion, a first lead portion extending from the one straight portion, and a first extension portion extending from the other straight portion in the same direction as the first lead portion. The second winding portion includes a first straight portion adjacent to one winding portion of the first winding portion, a second straight portion adjacent to the other straight portion of the first winding portion, and a first lead portion from the other straight portion. And a second extension portion extending in the same direction as the first extension portion from the other straight portion and connected to the first extension portion to form an inter-row connecting portion. The winding portion is wound around the armature core using a slot of the stator or the rotor.

  (2) An armature according to a second aspect of the present invention is the armature according to the fourth aspect, wherein a plurality of radially extending slots are provided in the circumferential direction, and a plurality of radially extending slots are provided in the circumferential direction. It is an armature composed of armature windings accommodated in two rows, and the winding portion for one pole of the armature winding is composed of a spiral first winding portion and a second winding portion.

  The first winding portion includes one linear portion accommodated in the lower layer of the first row in the first slot of the armature core, the other linear portion accommodated in the inner layer of the first row in the second slot, and the one linear portion. A first lead portion extending from the outermost peripheral layer to the one end surface side of the armature core, and a first extension portion protruding from the innermost peripheral layer of the other straight portion to the one end surface side.

  In addition, the second winding portion includes one straight portion housed in the lower layer of the second row in the first slot of the armature core, the other straight portion housed in the upper layer of the second row in the second slot, and the other A second lead-out portion extending from the outermost peripheral layer of the straight line portion to one end face side of the armature core, and a first extension portion projecting from the innermost peripheral layer of the one straight line portion to the first extension portion to form a connecting portion between rows A second extension. An S pole or an N pole is formed by the armature core and the first and second winding portions of the armature winding wound around the armature core.

  (3) An armature according to a third aspect of the present invention is the armature according to the seventh aspect, wherein the plurality of radially extending slots are separated in the circumferential direction, and the two armature cores are provided in the circumferential direction in the slots. An armature composed of armature windings housed in a row, wherein the armature windings are adjacent to a winding portion for a plurality of poles each having a spiral first winding portion and a second winding portion. And an inter-electrode connection portion for connecting the winding portions to be connected in series.

  The first winding portion includes one linear portion accommodated in the lower layer of the first row in the first slot, the other linear portion accommodated in the upper layer of the first row in the second slot, and the outermost peripheral layer of the one linear portion. From the innermost peripheral layer of the other straight line portion to the one end surface side of the armature core, and a first extension portion projecting to the one end surface side. In addition, the second winding portion includes the one straight portion housed in the lower layer of the second row in the first slot, the other straight portion housed in the upper layer of the second row in the second slot, and the outermost portion of the other straight portion. A second lead-out portion extending from the outer peripheral layer to one end surface side of the armature core, and a first extension portion projecting from the innermost peripheral layer of one linear portion to the first extension portion to form an inter-row connecting portion. 2 Extend the extension.

  Further, the inter-pole connection portion includes a first lead portion of the first winding portion of the first pole and a first lead portion of the first winding portion of the second pole adjacent to the first pole in the first circumferential direction. Of the first pole-to-pole connecting portion, the second lead portion of the second winding portion of the first pole, and the second winding portion of the third pole adjacent to the first pole in the second circumferential direction. And a second inter-electrode connection portion connecting the second lead portion in series. An S pole or an N pole is formed by the magnetic poles of the armature core and the first winding portion and the second winding portion of the armature winding wound around the armature core, and the winding portions constituting the predetermined pole are between the poles. Connected at the connection.

  (4) According to a fourth aspect of the present invention, there is provided a method of winding an armature winding, wherein, as described in claim 11, an armature core having a plurality of radially extending slots spaced apart in the circumferential direction, This is a method of winding an armature winding around an armature core in an armature comprising armature windings housed in two rows in the circumferential direction.

  In this winding method, (a) a cylindrical inner peripheral core having a plurality of slots opened on the outer peripheral surface and a cylindrical outer peripheral core having a plurality of slots opened on the inner peripheral surface are concentric. And (b) an original form in which a plurality of original form winding parts including a first original form winding part and a second original form winding part having a spiral shape are connected in series at an interelectrode connection part. Windings are prepared, and one linear portion of each first original winding portion and each second original winding portion is inserted side by side in each slot of the outer peripheral core, and each first original winding portion and each said first original winding portion (2) Inserting the other straight part of the original winding part side by side into each slot of the inner peripheral side iron core, and (c) rotating the inner peripheral side iron core and the outer peripheral side iron core relative to each other in the circumferential direction by a pole pitch. And a machining step of opening one linear portion and the other linear portion of the first original winding portion and the second original winding portion. When the inner peripheral side iron core and the outer peripheral side iron core into which the first original winding part and the second original winding part are inserted are relatively rotated, the first winding and the second winding are formed.

  Note that the winding portion 320 of the second conventional example shown in FIG. 14 includes two rows (one and the other) of winding portions 322 and 326. On the other hand, the lead portion 323 is drawn from the outermost periphery of the one winding portion 322, and the other lead portion 327 is drawn from the outermost periphery of the other winding portion 326. In this case, the one lead-out portion 323 is in the same plane as the turn portion 325 and does not cross the turn portion, so there is no concern about the interference.

  However, a problem remains in the connection portion 330 between the inner end 324 of the one spiral portion 322 and the inner end 328 of the other winding portion 326 shown in FIG. Since the connecting portion 330 is formed of a folded portion whose direction is reversed by 360 °, the direction of the current is reversed at one inner end and the other inner end 328, and as a result, the magnetomotive force due to the current flowing through the inner ends 324 and 328 cancels out. However, it is considered technically impossible or extremely difficult.

  (1) According to the armature winding of the first invention of the present application, the first lead portion of the first winding portion extends from the outermost peripheral layer of one linear portion, and the second lead portion of the second winding portion is the other It extends from the outermost peripheral layer of the straight portion, and the lead-out portion does not cross the turn portions of the first winding portion and the second winding portion. As a result, the lead-out part of a certain winding part does not interfere with the turn part of the adjacent winding part. Further, the first extension portion extending from the innermost peripheral layer of the other straight portion of the first winding portion and the second extension portion extending from the innermost peripheral layer of the one straight portion of the second winding portion. The connecting portion continuously connects the first winding portion and the second winding portion in the same circumferential direction and the connecting portion between the rows is outside the slot, so that the straight portion (conductor) in the slot The space factor does not decrease and the characteristics are good. According to the armature winding of the second and third aspects, the space factor of the straight portion (conductor) in the slot is improved.

  (2) According to the armature of the second invention, the first lead portion of the first winding portion extends from the outermost peripheral layer in the first slot, that is, from the straight portion (conductor) located at the outermost periphery in the first slot. The second lead portion of the second winding portion extends from the outermost peripheral layer in the second slot, that is, the straight portion (conductor) located at the outermost periphery in the second slot. As a result, even when the width of the armature core slot, that is, the width of the teeth is small, the lead wire of one winding portion does not interfere with the turn portion of the adjacent winding portion, and in particular, the number of slots per pole is large. Applicable to armature. According to the armature of claim 5, the above effect can be obtained in the rotor of the DC motor or the stator of the AC motor.

  (3) According to the armature of the third invention, the winding end of one winding portion of one pole and the winding start of the winding portion of one adjacent pole are continuously disconnected without being interrupted by the inter-electrode connection portion. Can be formed. In addition, winding portions for one pole and multiple slots can be formed simultaneously (continuously). Furthermore, the number of connection points between the winding portions is reduced, and automation is facilitated. Lead wires at both ends of the winding part can be connected with the shortest distance.

  According to the armature of the eighth aspect, when the number of rows is three, the width of the straight line portion is narrowed and can be inserted in the radial direction from the semi-closed slot. According to the armature of the ninth aspect, the combination of the original winding portions for three phases is facilitated. According to the armature of claim 10, when the armature core is composed of a single member, the structure is simple, and when the armature core is composed of the inner peripheral side iron core and the outer peripheral side core, the jig for opening the original winding portion Function as.

  (4) According to the winding method of the winding of the fourth invention, it is easy to form the winding portion from the original winding portion. Moreover, since the inner peripheral side iron core and the outer peripheral side iron core have a function as an iron core and a function as a jig, the cost can be greatly reduced. Even when the slot of the inner peripheral iron core is a closed slot, the armature winding can be inserted from the axial direction. According to the winding method of the twelfth aspect, the inner peripheral side iron core and the outer peripheral side iron core can be easily fitted, which is convenient for automation. According to the winding method of the thirteenth aspect, the armature winding can be inserted into the slot of the iron core from the axial direction.

  The present invention includes (a) an armature winding for a rotating electrical machine, (b) an armature including the armature winding, and (c) a method of winding the armature winding around the armature core.

<Overall>
In the present specification, the “armature” refers to a portion through which an electric current flows in order to generate a rotational force, and includes an armature core and an armature winding. Both AC motor stators and DC motor rotors are included. In particular, the present invention is effective for downsizing a motor having a large number of series conductors (turns) per coil.

  Further, the armature winding can be applied to a coreless motor having no slot in addition to being wound around a stator core (stator core) having a slot. Compared to the conventional coreless motor using a round wire, a coreless motor using a rectangular wire reduces the winding resistance by increasing the conductor cross-sectional area and improves the output (efficiency).

<Armature winding>
The armature winding is formed by connecting winding portions for multiple poles at an inter-electrode connection portion, and is wound around an armature core, that is, a stator core or a rotor core. The winding portion for one pole includes a first winding portion and a second winding portion that have a spiral shape so as to be mounted in a slot of the armature core, and both are connected by an inter-column connection portion. The first winding portion includes one linear portion (one coil side) inserted into the first slot, the other linear portion (other coil side) inserted into the second slot, and the armature from the outermost peripheral layer of the one linear portion. It includes a lead-out portion that is drawn out to one end surface of the iron core, an extension portion that extends from the innermost circumferential layer of the other straight portion to one end surface, and a turn portion that protrudes from the one end surface and the other end surface.

  The second winding portion includes one linear portion (one coil side) inserted into the first slot, the other linear portion (other coil side) inserted into the second slot, and an armature from the outermost peripheral layer of the other linear portion. It includes a lead-out portion that is drawn out to one end surface of the iron core, an extension portion that extends from the innermost circumferential layer of one linear portion to one end surface, and a turn portion that protrudes from one end surface and the other end surface.

  The number of one straight line part and the other straight line part of the first winding part and the second straight line part may be one, two or three, and the number of the first straight line part and the other straight line part is determined by the winding pitch. It is determined by the number of spirals of the original winding (original coil) that is the shape before opening. The one straight line part and the other straight line part of the second winding part are close to the one straight line part and the other straight line part of the first winding part, respectively. A pair of lead portions of the winding portion for one pole are connected by an inter-electrode connection portion to form a single continuous winding.

  The cross-sectional shape of the armature winding can be selected from a rectangular shape (flat angle), an elliptical shape, and a circular shape. If the rectangular shape is adopted, the space factor in the slot of the straight portion (coil side) can be increased, which is advantageous for downsizing of the rotating electrical machine. However, for example, the straight line of the original winding wound in a spiral shape may be pressed from the side surface to plastically deform the round wire, so that an ellipse or an ellipse close to a rectangular cross section can be obtained. Use of an easily available round wire is advantageous in terms of material cost. The round wire is also suitable for applications that prioritize production delivery.

<Armature>
The armature is composed of an armature core and an armature winding. Whether the armature is a stator or a rotor, the armature core has a generally cylindrical shape, and a plurality of slots extending in the radial direction and penetrating in the axial direction are spaced apart in the circumferential direction. As a result, slots and teeth are alternately present in the circumferential direction. The number of slots per pole per phase may be one or two. In one case, adjacent slots are in different phases, and in two cases, two slots in the same phase are continuous. In addition, when the number of slots per pole per phase is an even number (2, 4,...), The number of circumferential rows of straight portions inserted into each slot is an even number (2, 4,...). However, it may be an odd number (1, 3,...).

  The armature core may be composed of a single laminated member, but may also be composed of an inner peripheral core and an outer peripheral core that are concentrically arranged and relatively rotatable. In the former case, the stator has a plurality of slots that open to the inner peripheral surface, and the rotor has a plurality of slots that open to the outer peripheral surface. A semi-closed slot in which the width of the opening is narrower than the width of the slot may be used.

  In the latter case, the same number of slots are formed in the outer peripheral surface of the inner peripheral iron core and the inner peripheral surface of the outer peripheral iron core. The original winding (original coil) is opened by relative rotation, and the inner peripheral core and the outer peripheral core have a function as a jig for opening the original winding in addition to the original function as an iron core. In addition, a slit extending a predetermined length in the radial direction for each of a plurality of slots can be formed in the outer peripheral side iron core, and the thin portion of the outer edge of the slit can be plastically deformed when fitted to the inner peripheral side iron core.

  The armature winding is as described above, and the tooth around which the winding portion is wound is excited to the S pole or the N pole.

<Wounding method>
The winding portion is formed by opening a winding pitch of a straight portion (coil side) of a spiral original winding (original coil). Both of the original windings include a spiral first original winding portion (first original coil portion) and a second original winding portion (second original coil portion), which are connected by an inter-column connection portion. The spiral may be any one of one turn, two turns, three turns or more. For example, when the spiral is a two-turn winding, the original winding has two first straight portions, two second straight portions, a lead portion drawn from one of the first straight portions, and one of the second straight portions. And an extension extending from.

  The method of winding the armature winding around the armature core is roughly divided into two. In the first type, winding portions are sequentially wound around the teeth using slots of an iron core made of a single laminated member. On the other hand, in the second type, an insertion step of inserting the straight portion of the spiral original winding into the slot of the inner peripheral side core and the slot of the outer peripheral side core in the axial direction, the inner peripheral side core, the outer peripheral side core, And a fitting step of concentrically fitting the inner peripheral side iron core and the outer peripheral side iron core.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

<First embodiment>
The first embodiment is a case where the present invention is applied to an armature or a stator of an AC motor.

(Constitution)
(1) AC Motor A three-phase AC motor (permanent magnet synchronous motor) shown in FIG. 1 includes a housing 10, a stator 30, a rotor 25, and the like. The housing 10 includes a left housing 11 and a right housing 16 each having an open end. A stator (stator) 30 and a rotor (rotor) 25 are disposed in the left housing 11, and the right housing 16 covers them. That is, the rotary shaft 20 is rotatably supported by the end wall of the left housing 11 and the end wall of the right housing 16 via the bearings 12 and 17, and the columnar rotor 25 is attached to the middle portion thereof, A load (not shown) is connected to the shaft portion protruding from the end wall. The rotor 25 includes a rotor core (core) 26 and a plurality of permanent magnets 27 embedded therein, and faces the stator 30 in the radial direction.

(2) Stator As shown in FIGS. 1 and 2, the stator (stator) 30 includes a cylindrical armature core (core) 35 fixed to the left housing 11, and a slot 36 a via an insulator 38. And a U-phase armature winding (U-phase coil) 70 inserted in 36b and the like (the V-phase and W-phase armature windings are not shown).

  The core 35 is formed with a plurality of U-phase slots 36a, 36b,... That open to the inner peripheral surface, extend outward in the radial direction, and penetrate the entire length in the axial direction at a predetermined pole pitch. It has an elongated rectangular shape (the V-phase slot and the W-phase slot are not shown).

  Next, the coil and its winding method will be described with reference to FIGS. For convenience of explanation and easy understanding, one pole portion of the U-phase coil will be described first, then the entire U-phase coil will be described, and finally the three-phase coil will be described.

  In FIG. 2 (the upper side is the air gap surface), a winding portion (coil portion) 40 for one pole is wound around a first slot 36a of the core 35 and a second slot 36b separated from the first slot 36a in the circumferential direction. ing. The coil unit 40 includes a spiral first coil unit 42 and a second coil unit 52. The first coil portion 42 has two lower straight portions 43a and 43b, two upper straight portions 44a and 44b, a first lead portion 46 and a first extension portion 47, a lower straight portion 43a and an upper straight portion 44a. , A turn portion 48b connecting the lower layer straight portion 43b and the upper layer straight portion 44b, and a turn portion 49 connecting the lower layer straight portion 43b and the upper layer straight portion 44a. The lower straight portions 43a and 43b are accommodated in the lower layer of the first row (right row) of the first slots 36a via the insulator 38, and the upper straight portions 44a and 44b are accommodated in the first row of the second slots 36b via the insulator 38. It is housed in the upper layer (right side).

  The second coil portion 52 includes two lower straight portions 53a and 53b, two upper straight portions 54a and 54b, a second lead portion 56 and a second extension portion 57, a lower straight portion 53a and an upper straight portion. A turn portion 58a connecting 54a, a turn portion 58b connecting lower layer straight portion 53b and upper layer straight portion 54b, and a turn portion 59 connecting lower layer straight portion 53a and upper layer straight portion 54b.

  The lower straight portions 53a and 53b are accommodated in the lower layer of the second row (left column) of the first slot 36a, and the upper straight portions 54a and 54b are accommodated in the upper layer of the second row (left side) of the second slot 36b. . Two turn portions 48a and 48b connecting the lower straight portions 43a and 43b and the upper straight portions 44a and 44b, and two turn portions 58a and 58b connecting the lower straight portions 53a and 53b and the upper straight portions 54a and 54b, Projecting from the other end surface 37 b of the core 35.

  The first lead-out portion 46 extends from the outermost peripheral layer 43a of the lower layer straight portions 43a and 43b of the first coil portion 42 toward the one end surface 37a side of the core 35, and the upper layer straight portions 54a and 54b of the second coil portion 52. A second lead-out portion 56 extends from the outermost peripheral layer 54 a of the core 35 to the one end surface 37 a side. Of the upper layer straight portions 44 a and 44 b of the first coil portion 42, the first extension portion 47 extending from the innermost peripheral layer 44 b to the one end surface 37 a side, and the lower layer straight portions 53 a and 53 b of the second coil portion 52. A second extension 57 extending from the innermost peripheral layer 53b toward the one end surface 37a is connected to form a V-shaped connecting portion 50 between rows.

(Formation of U-phase coil)
The U-phase one-pole coil section 40 is formed by opening the U-phase original coil section 60 for one pole shown in FIG. 3 in the thickness direction (left-right direction in FIG. 3). The U-phase original coil portion 60 includes a first original coil 62 on the near side of the paper surface that is spirally wound from the first lead wire 46 on the outer peripheral side to the extension portion 47 on the inner peripheral side, and an extension portion 57 on the inner peripheral side. And a second original coil portion 64 wound twice in a spiral shape up to the lead-out line 56 on the outer peripheral side.

  FIG. 4 shows the first original coil portion 62 and the second original coil portion 64 separately. The first original coil 62 is a two-turn coil composed of four straight portions 43a, 43b, 44a and 44b and turn portions 48a, 48b and 49 located in the same plane, and from the outermost lower layer straight portion 43a. The first lead portion 46 extends, and the first extension portion 47 extends from the uppermost straight portion 44b of the innermost circumference. On the other hand, the second original coil 64 is a two-turn coil composed of four straight portions 53a, 53b, 54a and 54b and turn portions 58a, 58b and 59 located in the same plane, and the outermost straight portion 54a. The 2nd drawer | drawing-out part 56 is extended from, and the 2nd extension part 57 is extended from the innermost lower layer linear part 53b. And the 1st extension part 47 and the 2nd extension part 57 are connected by the connecting part 50 between the lines which inclined the inner peripheral side.

(One original coil with continuous gaps)
The U-phase coil 70 (see FIGS. 1 and 7) is manufactured from one U-phase prototype coil 61 in which U-phase prototype coil portions 60A to 60F for six poles shown in FIG. 5 are continuously formed. is there. In the original coil portion 60B of a certain pole, the four straight portions 43a, 43b, 44a and 44b of the first original coil portion 62 stacked in the radial direction, and the four straight portions 53a, 53b of the second original coil portion 64, 54a and 54b are arranged in two rows in the circumferential direction.

  The first lead portion 46 of the first original coil portion 62 of the original shape coil portion 60B and the first lead portion 46 of the first original shape coil portion 62 of the left-side adjacent original shape coil portion 60C are arc-shaped poles on the outer periphery side of the stator core. It is connected by the inter-connection part 67. Further, the second lead-out portion 56 of the second base-form coil portion 64 of the base-form coil portion 60B and the second lead-out portion 56 of the second base-form coil portion 64 of the base coil portion 60A on the right adjacent pole are circles on the inner periphery side of the stator core. They are connected by arc-shaped inter-electrode connection 68.

  The inter-electrode connecting portion 68 on the inner peripheral side of the stator core and the inter-electrode connecting portion 67 on the outer peripheral side protrude from the linear portions 43a, 43b, 54a and 54b toward the front side of the drawing. The situation is the same for the other poles. The one end 72a of the first original coil 62 of the right-end original coil 60A and the other end 72b of the first original coil 62 of the left-end original coil 60F are not connected, and both ends of the U-phase original coil 61 are connected. Is configured.

  At the time of actual manufacture of the U-phase original coil 61, winding starts from one end portion 72a slightly extended from the straight line portion 43a of the original coil portion 60A toward the front side in FIG. 5, and a straight line portion that is the end of winding of the original coil portion 60A. 54a is continuously connected to the straight line portion 54a of the original coil portion 60B on the left side by the interpole connection portion 68 on the inner peripheral side. The linear coil portion 43a, which is the end of coil winding of the original coil portion 60B, is continuously connected to the linear portion 43a of the original coil portion 60C on the left side by the interpolar connection portion 67 on the outer peripheral side.

  In the same manner, the remaining original coil 60 parts D to 60F are continuously connected, and the winding end of the original coil part 60F is extended to the other end part 72b. As described above, connecting the adjacent original coil portions 60A, 60B... With the interelectrode connecting portions 68 and 67 is referred to as “neighboring electrode connection”.

(Three-phase prototype coil)
FIG. 6 shows a state before the U-phase prototype coil 71, the V-phase prototype coil 74, and the W-phase prototype coil 77 are opened. A U-phase prototype coil 71, a V-phase prototype coil 74, and a W-phase prototype coil 77, which are continuously produced for six poles by adjacent pole connection, are repeatedly arranged in this order in the circumferential direction. First, winding is started from one end portion 72a of the U-phase original coil 71, and the original coil portion 70A → the interelectrode connection portion 73b → the original coil portion 70B → the interelectrode connection portion 73d → ... → the original coil portion 70F → the other end portion 72b. Connect in order. The U-phase original coil 71 is set on a positioning jig (not shown). As shown in FIG. 8, one end portion 72 a is a U-phase terminal connection portion, and the other end portion 72 b is a neutral point N.

  Subsequently, winding starts from one end portion 75a of the V-phase original coil 74, and the original coil portion 76a → the interelectrode connection portion 76b → the original coil portion 76c → the interelectrode connection portion 76d →... → the original coil portion 76f → the other end portion. Connect in the order of 75b and set in the same way. One end portion 75a is a V-phase terminal connection portion, and the other end portion 75b is a neutral point N. Further, winding starts from one end portion 78a of the W-phase original coil 77, and the original coil portion 79a → the interelectrode connecting portion 79b → the original coil portion 79c → the interelectrode connecting portion 79d → ... → the original coil portion 79f → the other end portion 78b. Connect in the order of, and set in the same way. One end portion 78a is a W-phase terminal connection portion, and the other end portion 78b is a neutral point N.

  The one end portions 72a, 75a and 78a of the U-phase prototype coil 71, the V-phase prototype coil 74 and the W-phase prototype coil 77 are adjacent to each other in the circumferential direction, and the other end portions 72b, 75b and 78b are also mutually circumferential. Adjacent. Further, the inter-electrode connection portions 73b, 73d,... Of the U-phase coil 71 and the inter-electrode connection portions 76b, 76d,. The interphase connection portions 79b, 79d,... Of the phase coil 77 are set in layers with a predetermined gap.

(Internal / external split stator core)
For the opening process of the U-phase prototype coil 71, the V-phase prototype coil 74, and the W-phase prototype coil 77, as shown in FIG. 7, the inner peripheral stator core 80 and the outer stator core 85 that are concentric at the radial center of the slot An inner / outer divided stator core divided into two parts is used as a jig. The inner circumference side stator core 80 and the outer circumference side stator core 85 are finally fitted with a cylindrical dividing surface 90.

  The inner peripheral side stator core 80 is formed with a plurality of U-phase slots 81 and a plurality of U-phase teeth 82 opened in the outer peripheral surface alternately in the circumferential direction. The inner peripheral edges of the U-phase teeth 82 facing the rotor (not shown) are connected to each other at the bottom of the U-phase slot 88 to form a closed slot. V-phase slots and W-phase slots are similarly formed.

  The outer peripheral side stator core 85 has a plurality of U phase slots 86 (the same number as the slots 81 of the inner peripheral side stator core 80) opened in the inner peripheral surface and a plurality of U phase teeth 87 alternately formed in the circumferential direction. The outer stator core 85 is partitioned into a plurality (9) of core pieces 91 including a plurality of teeth 87 by slits 88 extending radially outward from the dividing surface 90 between the two stator cores to the vicinity of the outer periphery. . The core pieces 91 are connected to each other by a thin connecting portion 92 provided at the outer edge of the slit 88.

  When the two stator cores 80 and 85 are coupled, the outer peripheral surface of the plurality of core pieces 91 of the outer peripheral side stator core 85 is pressed toward the center while the inner peripheral side stator core 80 is fitted in the hollow hole of the outer peripheral side stator core 85. Include. Further, the thin connecting portion 92 of the outer stator core 85 is plastically deformed toward the center, and the gap between the slits 88 is filled to bring the core pieces 91 into close contact. As a result, the inner diameter of the outer peripheral side stator core 85 is slightly reduced, and the inner peripheral side stator core 80 and the outer peripheral side stator core 85 are fitted by the cylindrical dividing surface 90.

  Here, the dividing surface 90 is a cylindrical surface in consideration of assembly. However, in order to increase the torque transmission capacity, the arc curvature may be lowered to be a flat surface. In this case, the inner peripheral side stator core and the outer peripheral side stator core are fitted to each other in a polygonal plane.

(Opening of original coil)
The opening process of the U-phase original coil 71 is performed as follows. In order to electrically insulate the slots of the inner peripheral side stator core 80 and the outer peripheral side stator core 85, slot insulators (not shown) on the inner peripheral side and the outer peripheral side are inserted in close contact before loading the original coil. The original coil portion 60B and the like of the U-phase original coil 71 shown in FIG. 5 are loaded in the slots 81 and 86 of the stator cores 80 and 85 shown in FIG. Is done. Specifically, the four one straight portions 45 (43a, 43b, 53a, and 53b) of the U-phase original coil 60B are accommodated in the slots 86 of the outer stator core 85, and the four other straight portions 55 (44a, 44b, 54a). And 54 b) are accommodated in the slots 81 of the inner stator core 80.

  In this state, in FIG. 7, the inner peripheral side stator core 80 is rotated clockwise with respect to the outer peripheral side stator core 85 by a pole pitch. Then, one straight portion 45 and the other straight portion 55 of the original coil portions 60A, 60B, 60C,... Are opened in the circumferential direction, and the turn portions 49 and 59 on one end face side of the stator cores 80 and 85 are processed. And the turn parts 48a, 48b and 58a, 58b on the other end surface side are extended in the circumferential direction. As a result, a U-phase coil 70 having a plurality of U-phase coil portions 70A, 70B, 70C... Corresponding to the coil portion 40 of FIG.

  In addition, in order to improve the assemblability of the rotor 25, the inter-pole connection line 68 on the inner peripheral side may be pushed outward in the radial direction from the inner peripheral surface of the inner peripheral stator core 80 after the opening process. In that case, the length of the inter-electrode connection line 68 is selected to be long in advance by the amount of spreading outward. The same applies to the case where the outer peripheral side inter-electrode connection line 67 interferes with the surrounding housing or the like.

  The V-phase prototype coil and the W-phase prototype coil (not shown) are also simultaneously opened to complete the V-phase coil and the W-phase coil. Next, when the neutral point N composed of the three other end portions 72b, 75b, and 78b is electrically and mechanically joined by joining or caulking, as shown in FIG. 8, a U-phase coil 70, a V-phase coil 95, and W-phase coil 97 is star-connected, and a three-phase coil is completed.

(effect)
According to the first embodiment described above, the following effects can be obtained. First, in FIG. 2, there is no fear that the first lead portion 46 and the second lead portion 56 of the coil portion 40 of a certain pole interfere with the turn portion 49 and the turn 59 of the adjacent coil portion 40. The first lead wire 46 of the coil part 40 has the same circumferential position as the turn part 49 and is located on the outermost side in the radial direction, and the second lead line 56 has the same circumferential position as the turn part 59 and the innermost side in the radial direction. It is because it is located in.

  Therefore, even if the widths of the slots and the teeth 37 and the teeth 37 are narrow, it is not necessary to make the inclination angles of the turn portions 49 and 59 gentle (can be abrupt), and the protruding amounts of the turn portions 49 and 59 are small. Become. As a result, the length of the winding portion 40 and thus the stator 30 can be shortened.

  Further, in FIG. 7, the inner peripheral side stator core 80 and the outer peripheral side stator core 85 not only function as a core in which the U phase coil 70 is accommodated, but also a jig for opening the U phase coil 70 from the U phase original coil 61. Also serves as. As a result, parts cost and assembly cost are halved compared to the case where both are separate.

  In addition, the following effects can be obtained. First, in FIG. 5, since the inter-electrode connection portions 68 and 67 of the U-phase original coil 61 are arranged near the inner periphery and the outer periphery of the original coil portion 60B and the like, the inter-electrode connection portion is opened when the original coil portion 60B and the like are opened. There is no concern that 68 and 67 interfere with the turn portions 48a, 48b, 49a, 49b, 58 and 59. In FIG. 7, the one end 72a and the other end 72b of the U-phase coil 70 composed of a plurality of U-phase coil portions 70A and the like do not have a risk of interfering with other coil portions (turn portions 49 and 59, etc.). This is because the one end portion 72a and the other end portion 72b are arranged on the outer side in the axial direction than the inter-electrode connection portion on the outer peripheral side. This situation is the same for the V-phase coil and the W-phase coil (see FIG. 6).

<Second embodiment>
Next, the stator of the second embodiment and the U-phase coil will be described with a focus on differences from the first embodiment with reference to FIGS.

(Constitution)
9 shows a sectional view in the axial direction of the stator 100, and FIG. 10 shows an end view of the stator 100 (slot insertion state diagram (for one phase and one pole pair). That is, FIG. 9 and FIG. In contrast to the first coil portion (first row) 42 and the second coil (second row) 44 portion of the U-phase coil portion of the first embodiment (FIG. 2) having a two-round spiral shape, The first row and the second row of the U-phase coil portion of the second embodiment have a three-round spiral shape, and the number of the radial straight portions in the slots of the inner and outer peripheral side stators is 4 to 6 in relation to this. Also, in the first embodiment, the number of slots per phase per pole is 1, but in the second embodiment, the number of slots per phase per pole is 2.

  More specifically, in FIGS. 10 and 11, the U-phase coil starts at one end 101 which is an outer peripheral lead wire, and ends at a neutral point N (149) through a plurality of U-phase coils. The first U-phase coil section 105 is wound three times between the first row and second row 106 in the slot 156 a of the outer stator core 155 and the first row and second row 111 of the slot 151 a of the inner stator core 150. ing. Subsequently, the second U-phase coil unit 115 is wound three times between the first row and second row 116 of the slot 156b and the first row and second row 121 of the slot 151b.

  More specifically, as shown in an enlarged view in FIG. 11, the winding of the inner circumferential stator core 150 that starts winding from the outermost outermost layer 107a of the first (left) row of the slots 156a of the outer circumferential stator core 155 and is separated by a pole pitch in the clockwise direction. It reaches the outermost peripheral layer 107b of the slot 151a. Thereafter, the second layer 107c from the outer periphery side of the first row of slots 156a → the second layer 107d from the outer periphery side of the first row of slots 151a → the third layer 107e from the outer periphery side of the first row of slots 156a → slot From the outer peripheral side of 151a to the third layer 107f. Subsequently, it reaches the innermost peripheral layer 108a of the second (right) row of slots 156a via the inter-column connection (not shown), and finally reaches the outermost peripheral layer 108f of the second row of slots 151a. It reaches.

  Returning to FIG. 10, the winding end (110f) of the second U-phase coil 115 is connected to the adjacent pole of the third U-phase coil 130 by the interelectrode connection portion 145, and the straight lines in the first and second rows thereof. The portion 133 and the straight portion 131 are wound three times. Subsequently, the first U-phase coil 125 of the adjacent slot and the first row and the second row of the straight portion 126 and the straight portion 128 are wound three times.

  From the end of winding of the fourth U-phase coil 125, the adjacent pole is connected to the fifth U-phase coil (not shown) of the adjacent pole by the inter-electrode connecting portion. As shown in FIG. 9, the interelectrode connecting portions 145 and 147 connecting the adjacent N-polar coils and S-polar coils are offset in the axial direction so that the phases do not interfere with each other. The end ends at neutral point 149.

  Each of the first to fourth U-phase coils 105, 115,... Is a U-phase prototype coil composed of a U-phase first prototype coil (not shown) and a U-phase second prototype coil (not shown) having a three-turn spiral. Opened in the thickness direction. During the opening process, the straight portion 111 or the like is inserted in the slot 151a or the like of the inner peripheral side stator core 150 in the axial direction, and the straight portion 106 or the like is inserted in the slot 156a or the like of the outer peripheral side stator 155 from the axial direction. Relative rotation in the circumferential direction. The slot 156a of the outer stator core 155 is inclined in the direction opposite to the rotational direction (counterclockwise direction) with respect to the radial direction.

(effect)
According to the second embodiment, in addition to the effects of the first embodiment, the following effects can be obtained. First, since the number of straight portions in the slots 151a and 151b of the inner peripheral side stator core 150 and the slots 156a and 156b of the outer peripheral side stator core 155 has increased to six, a rotating electrical machine suitable for high voltage specifications can be provided. In addition, the magnetomotive force distribution of the stator 100 is improved and torque ripple and operating noise during operation are reduced by increasing the number of slots for each pole and phase by a factor of two compared to the first embodiment. Furthermore, the inclination of the slot 156 of the outer stator core 155 in the direction opposite to the rotation direction is useful for preventing the straight portion from slipping out of the slot 156a when the U-phase original coil is opened.

<Third embodiment>
The third embodiment will be described with reference to FIG. In the first embodiment and the second embodiment, the number of rows in the circumferential direction of the linear portion accommodated in one slot is two, but it may be three. That is, not only the even number (2, 4) but also the odd number (1, 3,...) Column may be used. However, the number of slots for each pole / phase must be an even number (2, 4,...).

  In the third embodiment, as shown in FIG. 12, protrusions 202 and 204 are formed in the openings on the inner peripheral side of the slots 201 and 203 formed in the core 200 so as to be elongated in the radial direction, and the openings are narrow. (Semi-closed slot). In the slots 201 and 203, three linear portions of the U-phase coil are juxtaposed in the circumferential direction, and twelve in the radial direction are arranged.

  Six straight portions 211, 212, 213,... From the outermost circumferential layer of the first row of the first slot 201, and six straight portions 215, 216 from the outermost circumferential layer of the second row (intermediate row), 217,... Correspond to the first row and the second row 106 in the slot 156a of the outer stator core 155 of the second embodiment. In addition, six straight portions 231, 232, 233,... From the third outermost layer of the slot 201 and six straight portions 235, 236, 237 from the outermost layer of the first row of the slot 203. ,... Correspond to the first row and the second row 116 in the slot 156b of the second embodiment. Wedges 207 and 08 are attached to the openings of the slots 201 and 203 to prevent the straight portions (conductors) from coming out of the slots.

(effect)
According to the third embodiment, in addition to the effects of the first embodiment, the following effects can be obtained. First, in the slots 201 and 203, the number of rows of the straight portions 211, 215, 231 and the like is changed to three, so that the width of each straight portion 211, 212, 213, 215, 231 etc. (the circumferential dimension of the core). Can be narrowed. As a result, even if the width of the opening is a semi-closed slot narrower than the width of the slots 201 and 203, the straight portions 211, 212, 213, 215, 231 and the like are directed radially outward from the inner peripheral surface 205 side of the stator 200. Can be inserted into.

  However, when the number of rows in the slots 201 and 203 is increased, the clearance between the straight portions 211, 212, 213, 215, 231 and the like is increased, and the space factor of the straight portions 211 and the like in the slot 201 is two rows. Lower than Therefore, the number of columns may be determined in consideration of the ease of insertion of the straight portion 211 and the like and the space factor of the straight portion (conductor) in the slot.

  In addition, since the three-row arrangement of the straight portions 211, 212, 213, 215, 231 and the like is combined with the semi-closed slots 201 and 203, the magnetic resistance of the air gap can be reduced as compared with the case of the open slot, and the case of the closed slot Compared to the above, the leakage flux is reduced and the performance is improved. Thus, the fact that the present invention can be used for a semi-closed slot is further advantageous for downsizing of a rotating electrical machine.

It is a longitudinal cross-sectional view of the rotary electric machine to which this invention is applied. It is an insertion state figure (winding figure for one pole) in the slot of the coil of the 1st example. It is a perspective view which shows a U-phase original form coil (before opening process). It is the perspective view which divided and showed the U-phase original form coil in 2 rows. It is a top view of the U-phase prototype coil manufactured continuously for the number of poles. It is a top view of the three-phase split-element coil manufactured continuously for the number of poles. It is a top view of the state (for 1 phase) which opened and processed the U-phase original form coil. It is a wiring diagram of a three-phase coil. It is a principal part longitudinal cross-sectional view of 2nd Example. It is an insertion state figure to the slot of the coil of the 2nd example. It is a principal part detail drawing of FIG. It is a coil arrangement | positioning figure of 3rd Example. It is a perspective view which shows the coil | winding part (after opening process) of a 1st prior art example. It is a perspective view which shows the coil | winding part (before opening process) of a 2nd prior art example. It is a perspective view which shows the folding | turning part of a 2nd prior art example.

Explanation of symbols

10: Housing 25: Rotor 30: Armature (stator) 35: Iron core 36a, 36b: Slot 37: Magnetic pole (tooth)
37a: One end face 40: Winding part 42: First winding part 43a, 43b: One straight part 44a, 44b: The other straight part 46: First drawer part 47: First extension part 48, 49: Turn part 50 : Inter-row connection part 52: Second winding part 53a, 53b: One straight part 54a, 54b: The other straight part 56: Second drawer part 57: Second extension part 58, 59: Turn part

Claims (13)

An armature winding to be attached to the armature, wherein one winding portion (40) is composed of a spiral first winding portion (42) and a second winding portion (52),
The first winding portion includes one straight portion (43a, 43b) and the other straight portion (44a, 44b), a first lead portion (46) extending from the outermost peripheral layer of the one straight portion, and the other straight portion. A first extension (47) extending from the innermost peripheral layer in the same direction as the first lead portion,
The second winding portion includes one linear portion (53a, 53b) adjacent to one linear portion of the first winding portion and the other linear portion (54a, 54b) adjacent to the other linear portion of the first winding portion. A second lead portion (56) extending in the same direction as the first lead portion from the outermost peripheral layer of the other straight portion, and the first lead portion from the innermost peripheral layer of the one straight portion of the second winding portion. A second extension portion (57) extending in the same direction as the extension portion and connected to the first extension portion to form a connecting portion between rows,
Armature winding characterized by that.   The armature winding according to claim 1, wherein the first winding portion and the second winding portion have a rectangular cross section.   2. The electric machine according to claim 1, wherein the one straight part and the other straight part of the first winding part and the one straight part and the other straight part of the second winding part have an elliptical cross section or an elliptical cross section. Child winding. An electric machine comprising an armature core (35) having a plurality of radially extending slots (36a, 36b) spaced in the circumferential direction and armature windings housed in two rows in the slot in the circumferential direction A child,
The winding portion (40) for one pole of the armature winding is composed of a spiral first winding portion (42) and a second winding portion 52,
The first winding portion (42) includes one linear portion (43a, 43b) and a second slot (36b) accommodated in the lower layer of the first row in the first slot (36a) of the armature core. The other straight portion (44a, 44b) housed in the upper layer of the first row, the first lead portion (46) extending from the outermost peripheral layer of the one straight portion to the one end surface (37a) side of the armature core, and the other Including a first extension portion (47) projecting from the innermost circumferential layer of the straight portion toward the one end surface,
The second winding portion (52) is accommodated in the lower layer of the second row in the first slot of the armature core, and the straight portion (53a, 53b) accommodated in the lower layer of the second row in the first slot of the armature core. The other straight line portion (54a, 54b) accommodated, a second lead-out portion (56) extending from the outermost peripheral layer of the other straight line portion to one end surface (37a) side of the armature core, and the outermost layer of the one straight line portion An armature comprising: a second extension portion (57) protruding from an inner peripheral layer to one end face side and connected to the first extension portion to form an inter-row connecting portion (50).   The armature according to claim 4, wherein the armature is a rotor of a DC motor or a stator of an AC motor.   5. The armature winding according to claim 4, wherein the one straight portion and the second straight portion of the first winding portion and the one straight portion and the second straight portion of the second winding portion are rectangular in cross section. An armature comprising an armature core in which a plurality of slots extending in the radial direction are circumferentially spaced, and an armature winding housed in two rows in the slot in the circumferential direction,
The armature winding includes a plurality of winding portions each having a spiral first winding portion and a second winding portion, and an interelectrode connecting portion for connecting the winding portions in series,
The first winding portion includes one linear portion housed in the lower layer of the first row in the first slot, the other straight portion housed in the upper layer of the first row in the second slot, and the outermost portion of the one straight portion. A first lead portion extending from the outer peripheral layer to the one end surface side of the armature core, and a first extension portion protruding from the innermost peripheral layer of the other straight portion to the one end surface side;
The second winding portion includes one linear portion accommodated in the lower layer of the second row in the first slot, the other linear portion accommodated in the upper layer of the second row in the second slot, and the other linear portion. A second lead-out portion extending from the outermost peripheral layer to one end surface side of the armature core, and projecting from the innermost peripheral layer of the one straight portion to the one end surface side and connected to the first extension portion to form a connecting portion between rows. A second extension that has
The inter-electrode connection portion includes a first lead portion of the first winding portion of the first pole and a first lead portion of the first winding portion of the second pole adjacent to the first pole in the first circumferential direction. A first pole-to-pole connection part (67) for connecting the part in series with the second lead part of the second winding part of the first pole and a third pole adjacent to the first pole in the second circumferential direction The armature including a second inter-electrode connection portion (68) for connecting the second lead portion of the second winding portion in series.   The armature according to claim 7, wherein one or more linear portions and the other linear portions of the first winding portion and the second winding portion are arranged in the slot in three or more rows in the circumferential direction.   Both of the arc-shaped first interelectrode connecting portion and the second interelectrode connecting portion are located on the inner peripheral side and the other is located on the outer peripheral side, and the first interelectrode connecting portion and the second pole in the circumferential direction. The armature according to claim 7, wherein the inter-connection portions are alternately positioned.   The armature according to claim 7, wherein the armature core includes a cylindrical single member, or an inner peripheral side iron core and an outer peripheral side iron core that are concentrically fitted together and have a cylindrical shape. An armature comprising: an armature core in which a plurality of slots extending in the radial direction are spaced apart in the circumferential direction; and an armature winding housed in two rows in the circumferential direction in the slot. Is wound around the armature core,
An arrangement step of concentrically arranging a cylindrical inner peripheral side iron core having a plurality of slots opened in the outer peripheral surface and a cylindrical outer peripheral side iron core having a plurality of slots opened in the inner peripheral surface;
Both of the first original shapes are prepared by connecting a plurality of original shape winding portions including the first original shape winding portion and the second original shape winding portion, both of which are spiral, connected in series at the inter-electrode connection portions. One straight line portion of the winding portion and each second original winding portion is inserted side by side in each slot of the outer peripheral side iron core, and the other straight line of each first original winding portion and each second original winding portion An insertion step of inserting the portion side by side into each slot of the inner peripheral iron core,
The inner peripheral side iron core and the outer peripheral side iron core are rotated relative to each other in the circumferential direction by a pole pitch to open one straight portion and the other straight portion of the first original winding portion and the second original winding portion. Processing steps to
A method for winding an armature winding around an armature core, comprising:   The outer peripheral side iron core is formed with a plurality of slits extending in a radial direction from the inner peripheral surface to the vicinity of the outer peripheral surface, and the outer peripheral side iron core is plastically deformed at a thin-walled connecting portion provided at an outer edge of the slit in the arranging step. The winding method according to claim 11, wherein the inner diameter of the inner peripheral side iron core is reduced and the outer peripheral surface of the inner peripheral side iron core is closely fitted.   The winding method according to claim 11, wherein the inner peripheral slot of the inner peripheral iron core is a closed slot whose inner peripheral side is closed, and the armature winding is inserted into the inner peripheral slot from the axial direction in the inserting step. .

Images