JP2011176902A - Armature and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an armature of an electric motor or a generator for improving magnetic characteristics by increasing a magnetic flux, and for improving manufacture efficiency. <P>SOLUTION: The armature of a rotary drive type electric motor or a rotary drive type generator includes a plurality of split cores 3 connected mutually to form an annular stator core, and a coil 5 wound around each split core 3. A connection projection 621 or a connection recess 622 fitted mutually to connect each split core 3 is provided at each end in a circumferential direction of each split core 3. The connection projection 621 and the connection recess 622 are formed along the circumference of a virtual circle C centered on a virtual point P outside the diametric direction of the stator core. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an armature used in a rotary drive type motor or generator and a method for manufacturing the same.

  In general, a hybrid type construction machine such as an electric swing excavator is provided with an electric motor for driving an upper rotating body and a generator as a power source for the electric motor.

  Many generators and motors are of a rotational drive type including a stator and a rotor, and either one of the stator and the rotor is wound with a coil to constitute an armature. As an armature of such an electric motor or generator, a configuration having a split stator core is known (see, for example, Patent Document 1).

  The armature of Patent Document 1 includes a plurality of divided cores that constitute an annular stator core, and each divided core includes an arcuate yoke portion and a tooth portion extending radially inward from the yoke portion. ing. One end of the yoke portion is provided with an engagement convex portion having a disk-like tip, and an engagement concave portion having a shape corresponding to the engagement convex portion is provided on the other end side. The split core can be engaged by the engaging convex portion and the engaging concave portion, and can be rotated around the engaging convex portion and the engaging concave portion while being connected to each other. For this reason, when the coil is wound around the tooth portion, the coil can be easily wound since it can be arranged in a straight line with the divided cores connected.

JP 2003-164080 A

  However, in the stator core of Patent Document 1, since the split cores are linearly arranged in a state where the engaging convex portions and the engaging concave portions are engaged, the outer peripheral edge of the split core is used for the purpose of preventing interference between adjacent split cores. The corners are cut out to be tapered. Therefore, when the stator core is formed by connecting the split cores, notches are present in the outer peripheral portion, and the magnetic path (flux path) is reduced by that amount, and the magnetic flux passing through the stator core is concentrated. The problem occurs. When the magnetic flux is concentrated, so-called iron loss occurs, and heat is generated at the portion where the magnetic flux is concentrated. The iron loss is composed of hysteresis loss and eddy current loss. However, hysteresis loss or eddy current loss is increased by increasing the magnetic flux density due to concentration of magnetic flux. As a result, the efficiency of the generator or motor decreases.

  Moreover, in patent document 1, since the engagement convex part and the engagement recessed part are formed in disk shape, the diameter dimension becomes small and it is difficult to ensure sufficient processing accuracy at the time of manufacture. When a stator core is formed by stacking disk-shaped electromagnetic steel sheets, each electromagnetic steel sheet is produced by press punching, but it is necessary to use an end mill having a small diameter when processing the punching die. For this reason, high precision is required for the punching die processing, and the die processing time is increased, resulting in an increase in cost. Moreover, when forming the stator core on a block from electromagnetic steel materials, high processing precision is required similarly. Therefore, when the split cores are connected, there is a possibility that a gap is generated between the engaging convex part and the engaging concave part, and there is a problem that a part where the magnetic flux is concentrated occurs due to this gap. .

  Furthermore, in patent document 1, the engagement convex part and the engagement concave part are not in the shape which suppresses cancellation | release of mutual engagement. In addition, the engaging core and the engaging recess are not provided in the split core that is finally connected when forming the stator core. For this reason, in order to maintain the state where the split cores are connected in an annular shape, it is necessary to press-fit the split cores connected in an annular shape into the cylindrical container after the split cores are finally connected by welding. . Therefore, since it takes time to manufacture the armature, there is a problem that the manufacturing efficiency of the armature is lowered.

  An object of the present invention is to provide an armature capable of improving magnetic characteristics while avoiding concentration of magnetic flux and improving a manufacturing efficiency, and a manufacturing method thereof.

  The armature of the electric motor or generator of the present invention is an armature of a rotary drive type electric motor or generator, and is wound around each of the divided cores connected to each other to form an annular stator core. A connecting convex portion or a connecting concave portion that fits each other and connects the respective divided cores is provided at each end in the circumferential direction of each of the divided cores. The recess is formed along the circumference of a virtual circle centered on a virtual point outside the radial direction of the stator core.

  In the motor or generator armature of the present invention, the connection convex portion and the connection concave portion have a fitting surface formed along the circumference having a first radius of curvature centered on the virtual point, and And a fitting surface formed along the circumference having a second radius of curvature larger than the first radius of curvature with a virtual point as a center.

  In the motor or generator armature of the present invention, each of the divided cores is provided with the connecting convex portion at one end in the circumferential direction and the connecting concave portion at the other end, It is desirable that all the cores have the same shape.

  A method for manufacturing an armature for an electric motor or a generator according to the present invention is a method for manufacturing an armature for a rotary drive type electric motor or a generator, and includes a plurality of divided cores that are connected to each other to form an annular stator core. Forming a plurality of split cores having connection convex portions or connection concave portions formed along the circumference of a virtual circle centered on a virtual point outside the radial direction of the stator core at each end in the circumferential direction; The plurality of divided cores are arranged in a straight line, a coil is wound around each of the divided cores, the coupling convex portion and the coupling concave portion are fitted, and the plurality of divided cores excluding at least one divided core The connecting projections are connected in an arc shape, and the at least one split core is fitted between both ends in the circumferential direction of the split cores connected in the arc shape, and slides along the axial direction of the stator core. And the connecting recess DOO Mate, characterized by connecting all the divided cores.

  In the motor or generator armature manufacturing method according to the present invention, the motor or the generator is a multiphase AC type, and each of the split cores alone or together with other adjacent split cores, the AC flowing in the coil A core segment corresponding to the phase of the current is formed, and as the at least one divided core, the core segment is fitted between both ends in the circumferential direction of the divided cores connected in the arc shape, and all the divided cores are fitted. It is desirable to connect.

  According to the armature of the present invention, at each end in the circumferential direction of each divided core constituting the stator core of the armature, there is provided a connecting convex portion or a connecting concave portion that fits each other and connects each divided core. The connecting convex portion and the connecting concave portion are formed along the circumference of a virtual circle centered on a virtual point on the outer side in the radial direction of the stator core. According to such a configuration, from the state in which the split cores are arranged in a straight line, the split cores are rotated around the virtual point, thereby fitting the connecting convex portions and the connecting concave portions between the adjacent split cores. And connect the split cores.

  In other words, the divided cores arranged in a straight line are positioned in the same state as when the stator core is developed by the rotation of the divided core around the virtual point. In other words, in a state where the split cores are arranged in a straight line, the interval between adjacent split cores becomes wider toward the inner side in the radial direction, and the split cores can be rotated even at the corners of the outer peripheral edge of the narrowest split core. Until the divided cores are connected in a circular arc shape by movement, they do not contact the corners of the outer peripheral edges of the adjacent divided cores.

  For this reason, it is not necessary to cut out the corners of the outer peripheral edge of the split core for the purpose of preventing interference between the split cores when the split cores are arranged in series. Therefore, when the stator core is formed by connecting the split cores, it is possible to avoid the occurrence of notches in the stator core, so it is possible to prevent the magnetic path from being reduced due to the notches, and to concentrate the magnetic flux through the stator core. It can be avoided.

  In addition, since the connecting convex portion and the connecting concave portion are formed along the circumference of an imaginary circle centered on a virtual point outside the radial direction of the stator core, for example, the connecting convex portion and the connecting concave portion are formed in a disk shape. Compared to the case where the connecting convex portion and the connecting concave portion are formed along the circumference of the virtual circle when the virtual point is set on the split core, the connecting convex portion and the connecting concave portion are configured with gentle curves. It will be. When forming a stator core by laminating electromagnetic steel sheets, each electromagnetic steel sheet is made by press punching. However, if the curved lines constituting the connecting convex part and the connecting concave part of the electromagnetic steel sheet of the present invention are gentle, punching gold Mold processing is easy. That is, it is not necessary to use an end mill having a small diameter in order to process a mold having a shape having a small curvature. For this reason, high machining accuracy is not required for the mold, and much mold machining time is not required. Therefore, as a result, the manufacturing cost of the stator core can be suppressed.

  Moreover, when forming a block-shaped stator core from an electromagnetic steel material, the high processing precision is not required similarly to the case where a stator core is formed from an electromagnetic steel plate. For this reason, since it becomes possible to easily secure the required processing accuracy when forming the connecting convex portion and the connecting concave portion, a gap is generated between the connecting convex portion and the connecting concave portion when the split cores are connected. Can be prevented. Therefore, since a sufficient magnetic path can be secured, it is possible to avoid concentration of magnetic flux, and to prevent an increase in iron loss of the stator core.

  In addition, since the connecting convex portion and the connecting concave portion are curved in a direction different from the connecting direction of the split core, after connecting the split core and assembling the stator core, the connecting convex portion and the connecting concave portion of the split core are It acts to suppress the release of the connected state. Therefore, it is not necessary to connect the split cores by welding or press-fit them into the housing, and the time required for manufacturing the stator core can be shortened, so that the armature manufacturing efficiency can be improved.

  In the armature of the present invention, the connection convex portion and the connection concave portion are formed with a fitting surface formed along the circumference having a first radius of curvature centered on the virtual point, and the virtual point as the center. A fitting surface formed along the circumference having a second radius of curvature larger than the first radius of curvature, and the fitting surfaces of the connecting convex portion and the connecting concave portion facing each other are common. It is formed along a circumference having the same radius of curvature with a virtual point as the center. Accordingly, since it is possible to prevent a gap from being generated between the connecting convex portion and the connecting concave portion in a state where the connecting convex portion and the connecting concave portion are fitted, the magnetic flux is concentrated on the fitting portion of the connecting convex portion and the connecting concave portion. Can be avoided.

  In the armature of the present invention, the connecting convex portion is provided at one end portion in the circumferential direction of each divided core, the connecting concave portion is provided at the other end portion, and each divided core has the same shape. If formed, it is not necessary to replace the mold or provide a separate production line for forming the split core. Therefore, since the manufacturing time of the stator core can be further shortened, the manufacturing efficiency of the armature can be further improved.

According to the armature manufacturing method of the present invention, the armature of the present invention having the above-described effects can be obtained.
Here, when the divided cores having the connecting convex portions and the connecting concave portions are connected in an arc shape, at least one divided core is orthogonal to the axial direction of the stator core, unlike the case of connecting the divided cores so far. It becomes impossible to connect in the in-plane direction of the surface.

  According to the armature manufacturing method of the present invention, the coil can be wound only by fitting at least one split core along the axial direction of the stator core between both ends in the circumferential direction of the split cores connected in an arc shape. All mounted cores can be connected. For this reason, since it is possible to easily connect the split cores regardless of a time-consuming method such as welding, it is possible to reduce the time required for manufacturing the armature.

  In the armature manufacturing method of the present invention, each of the split cores constitutes a core segment according to the phase of the alternating current flowing through the coil, alone or together with another adjacent split core, and the at least one split core When connecting all the split cores by fitting the core segments between the circumferential ends of the split cores connected in the arc shape, the coils in the core segments are connected to each other and connected in an arc shape. A stator core can be formed by fitting a core segment between both ends of the divided core.

  In this case, the coils in the core segment are connected with each other in a state where the interval between the teeth of the adjacent divided cores is wide, unlike the case where the coils of the cores of the core segment are connected to each other after connecting the divided cores in a ring shape first. Therefore, the coil winding operation in the core segment can be efficiently performed. Therefore, the manufacturing efficiency of the armature can be improved.

The top view which shows typically the construction machine which concerns on 1st Embodiment of this invention. The top view which shows the armature in the said 1st Embodiment. The perspective view which shows the division | segmentation core in the said 1st Embodiment. The top view which shows a division | segmentation core. The 1st figure which shows the manufacturing method of an armature. The 2nd figure which shows the manufacturing method of an armature. The 3rd figure which shows the manufacturing method of an armature. The 4th figure which shows the manufacturing method of an armature. The 5th figure which shows the manufacturing method of an armature. The top view which shows the division | segmentation core of the armature which concerns on 2nd Embodiment of this invention.

  Hereinafter, each embodiment of the present invention will be described with reference to the drawings. In the second embodiment to be described later, the same components as those in the first embodiment described below and components having similar functions are denoted by the same reference numerals, and description thereof will be simplified or omitted.

[First Embodiment]
In FIG. 1, an electric swing excavator 10 includes a swing body 13 installed on a track frame constituting a lower traveling body 11 via a swing circle 12, and a generator and a capacitor (not shown). The revolving body 13 is provided with a boom 15, an arm 16, and a bucket 17 that constitute a working machine 14 and are each operated by a hydraulic cylinder (not shown). Such a revolving structure 13 is swiveled by a three-phase AC motor 18 that meshes with the swing circle 12. The electric power generated as regenerative energy by the electric motor 18 is stored in the capacitor together with the electric power generated by the generator. The capacitor discharges to perform a so-called assist operation that supplements the output of the generator, and discharges to power the motor 18.

  FIG. 2 shows the armature 1 of the electric motor 18. The armature 1 includes a plurality of split cores 3 constituting a stator core 2, an insulator 4 attached to the split core 3, and a coil 5 wound around the split core 3 via the insulator 4, and a rotor (not shown). In addition, the electric motor 18 is configured.

  As shown in FIG. 3, the split core 3 is formed by laminating a predetermined number of core sheets 6 made of electromagnetic steel plates. On one surface of the core sheet 6, a fitting convex portion 61 that protrudes in the out-of-plane direction is provided. On the other surface of the core sheet 6, a fitting concave portion (not shown) is formed at a position corresponding to the fitting convex portion 61, and the fitting convex portion 61 is fitted into this fitting concave portion, so that the core The sheets 6 are fixed to each other. Such a core sheet 6 is formed in a plan view by an arcuate yoke portion 62 extending in the circumferential direction with respect to the central axis of the armature 1 and a tooth portion 63 extending radially inward from the yoke portion 62. It is formed in a T shape.

  As shown in FIG. 4, a connecting projection 621 is formed at one end in the circumferential direction of the yoke 62. A connecting recess 622 having a shape corresponding to the connecting protrusion 621 is formed at the other end of the yoke part 62, and the connecting core 621 fits into the connecting recess 622 so that the divided cores 3 can be connected to each other. It has become. The connecting convex portion 621 and the connecting concave portion 622 are formed along the circumference of a virtual circle C centering on a virtual point P on the outer side in the radial direction of the stator core 2 (see FIG. 2).

  Specifically, the fitting surface 621A on the inner side of the virtual circle C in the connecting convex portion 621 is formed along a curve having a constant radius of curvature R1 with the virtual point P as the center of curvature, and the fitting surface 621B on the outer peripheral side. Is formed along a curve having a curvature radius R2 that is constant and has a curvature radius R2 that is larger than the curvature radius R1 of the fitting surface 621A. Similarly, the inner and outer fitting surfaces 622A and 622B of the connection recess 622 have imaginary points P as the centers of curvature, respectively, and curvature radii R3 and R4 that are substantially the same as the radii of curvature R1 and R2 of the connection protrusion 621. Is formed along a curve having

  Here, if the connecting convex portion 621 and the connecting concave portion 622 are formed by a circle centered on the corner portion on the outer peripheral side of the yoke portion 62 without using a point on the space called the virtual point P, the inner periphery of the connecting convex portion 621 is formed. Since the curvatures of the engagement surfaces 621A and 621B on the side and the outer periphery side and the curvatures of the engagement surfaces 622A and 622B on the inner periphery side and the outer periphery side of the coupling recess 622 are reduced, a mold for punching the stator core 2 High machining accuracy is required. Therefore, a virtual point P is set on the outer side in the radial direction of the stator core 2, the curvatures of the fitting surfaces 621 </ b> A and 621 </ b> B on the inner peripheral side and the outer peripheral side of the connection convex portion 621, and the inner peripheral side and the outer peripheral side of the connection concave portion 622. The curvatures of the fitting surfaces 622A and 622B are increased.

  In FIG. 4, the insulator 4 is attached to the tooth portion 63 (see FIG. 3) of the split core 3 and covers the tooth portion 63. As shown in FIG. 5, the insulator 4 is configured by a divided insulator 41 having a U-shaped cross section divided in the stacking direction of the core sheet 6. Such an insulator 4 is formed of an insulating material such as resin, and electrically insulates the stator core 2 and the coil 5 from each other.

  Returning to FIG. 2, the coil 5 is connected to each other between a plurality of adjacent divided cores 3, and the divided core 3 connected to the coil 5 constitutes a core segment 7 in which an alternating current of the same phase of the three phases flows. To do. Furthermore, the coil 5 of the core segment 7 is connected to the coil 5 of the core segment 7 facing the central axis of the armature 1 by a crossover (not shown). Thereby, the alternating current of the same phase flows through the two core segments 7 facing each other.

Next, a method for manufacturing the armature 1 will be described.
First, as shown in FIG. 3, the core sheet 6 is laminated | stacked and the division | segmentation core 3 is formed.
Next, as shown in FIG. 5, the split cores 3 are arranged in series with the connection convex portion 621 and the connection concave portion 622 facing each other. Then, the divided insulator 41 is covered on the teeth 63 of the divided core 3 from both sides in the stacking direction of the core sheet 6 from the vertical direction along the central axis of the armature 1, and the teeth 63 are covered with the insulator 4.

  Subsequently, as shown in FIG. 6, the coil 5 is wound around the tooth portion 63 via the insulator 4. Then, as shown in FIG. 7, the divided cores 3 are moved so that the divided cores 3 arranged in a straight line are wound toward the teeth portion 63 side, and the divided cores 3 are connected in an arc shape. .

  This operation is performed by a jig (not shown) provided with a connecting piece corresponding to each divided core 3. Each connecting piece of the jig is connected to an adjacent connecting piece and is configured to be rotatable about a virtual point P. As shown in FIG. 8, such a connecting piece is first linearly moved in the arrangement direction indicated by the arrow A in the figure while the divided cores 3 are fixed and arranged in a straight line. Then, as shown by an arrow B, the winding piece starts to wrap around in order from the connecting piece on the head side, and moves so that the radius of curvature gradually decreases. Then, the split core 3 fixed to the connecting piece moves with the movement of the connecting piece, and gradually narrows the interval between the adjacent split cores 3.

  Here, the connecting convex portion 621 and the connecting concave portion 622 are formed along the circumference of a virtual circle C centering on a virtual point P on the outer side in the radial direction of the stator core 2. Curved in different directions. That is, the inner and outer fitting surfaces 621A and 621B of the connecting convex portion 621 and the inner and outer fitting surfaces 622A and 622B of the connecting concave portion 622 have the same radius of curvature. It is formed along the curve. For this reason, by rotating the split core 3 around the virtual point P, the connecting convex portion 621 and the connecting concave portion 622 are fitted to each other with the adjacent split core 3, and the split core 3 is connected. Accordingly, as shown in FIG. 9, for example, the split cores 3 are connected in an arc shape, leaving the split cores 3 necessary for forming the core segment 7 for one phase.

  On the other hand, after the coil 5 is wound around the remaining divided cores 3, the remaining divided cores 3 are similarly connected to separately prepare the core segment 7. The formation of the core segment 7 here may be performed at any timing of a pre-process, a post-process, and a parallel process of connecting the divided cores 3 in an arc shape.

  Thereafter, as shown in FIG. 9, separately prepared core segments 7 are inserted between both end portions of the split cores 3 connected in an arc shape, and the core segments 7 are slid along the axial direction. As a result, the connecting convex portions 621 are fitted into the mating connecting concave portions 622 to form the annular stator core 2. And the coil 5 of each core segment 7 in the stator core 2 is connected with the coil 5 of the opposing core segment 7 by a crossover.

  In the armature 1 having the above-described configuration, it is possible to connect the divided cores 3 adjacent to each other by simply rotating the divided cores 3 around the virtual point P from the state in which the divided cores 3 are linearly arranged. Since the part 621 and the connection recessed part 622 can be fitted and the division | segmentation core 3 can be connected, the manufacturing efficiency of the armature 1 can be improved. Under the present circumstances, the corner | angular part of the outer periphery of adjacent division | segmentation core 3 does not contact the corner | angular part of the outer periphery of adjacent division | segmentation core 3 until division | segmentation core 3 is connected in circular arc shape by rotation of division core 3. For this reason, since the split cores 3 can be arranged in a straight line without notching the corners of the outer peripheral edge of the split core 3, it is possible to prevent the magnetic path from being reduced due to the notches. Accordingly, concentration of magnetic flux passing through the stator core 2 can be avoided and an increase in iron loss of the stator core 2 can be prevented, so that the magnetic characteristics of the stator core 2 can be improved.

  In addition, the stator core 2 is divided by the divided core 3 so that the electromagnetic steel sheet can be used more effectively than the case where the stator core 2 is configured by stacking the core sheets 6 formed by punching the magnetic steel sheets in a ring shape with a press machine. And the yield can be improved.

  Further, when the split cores 3 around which the coils 5 are wound are connected to form the stator core 2, a jig provided with a connecting piece corresponding to each split core 3 is used, so that the split cores 3 can be connected efficiently. Can be done. Thereby, the manufacturing time of the armature 1 can be shortened.

[Second Embodiment]
Next, a second embodiment of the present invention will be described based on FIG.
In the first embodiment described above, the stator core 2 is composed of the split cores 3 having the same shape, and the connecting convex portion 621 is connected to one end side in the circumferential direction of the yoke portion 62 of the split core 3 and connected to the other end side. Recesses 622 were respectively formed.

  On the other hand, in the second embodiment, as shown in FIG. 10, the stator core 2 is composed of two types of divided cores 3A and 3B having different shapes, and one end of the divided core 3A has both ends of the yoke portion 62. The connection convex part 621 is formed in the part, and the split core 3B having the other shape is different in that the connection concave part 622 is formed at both ends of the yoke part 62.

  Also in such divided cores 3A and 3B, the connecting convex portion 621 and the connecting concave portion 622 are formed along the circumference of a virtual circle C centered on a virtual point P on the outer side in the radial direction of the stator core 2. Therefore, the armature 1 of the present embodiment can achieve the same effects as those of the first embodiment described above.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
For example, in each of the embodiments described above, the armature 1 is used in the three-phase AC motor 18, but is not limited thereto, and the single-phase AC motor 18 or a multiphase AC motor 18 other than the three-phase motor 18 is used. It may be used.

Moreover, in each said embodiment, although the armature 1 was used for the electric motor 18 of the electric swivel excavator 10, it is not restricted to this. The armature 1 can be used for any electric motor. For example, the armature 1 may be used for an electric motor of a construction machine other than the electric swivel excavator 10 such as an electric motor applied to a traveling body of a wheel loader. Moreover, you may use for the electric motor applied to the traveling body of industrial vehicles, such as a forklift.
Furthermore, in each of the embodiments described above, the armature 1 of the present invention is used in the electric motor 18, but is not limited thereto, and may be used in a generator as long as it is a rotary drive type including a stator and a rotor. .

  In each said embodiment, although the core sheet 6 which consists of an electromagnetic steel plate was laminated | stacked and the division | segmentation core 3 was formed, it is not restricted to this, You may form the division | segmentation core 3 directly in a block form from an electromagnetic steel material.

In each said embodiment, although the division | segmentation insulator 41 was divided | segmented in the lamination direction of the core sheet 6, if it is a form which can cover the teeth part 63 of the division | segmentation core 3, it is not restricted to this, For example, the division | segmentation core 3 It may be divided in the connecting direction.
Moreover, in each said embodiment, although the coil 5 was wound around the split core 3 via the insulator 4, it is not restricted to this. In short, it suffices if the divided core 3 and the coil 5 can be electrically insulated. For example, instead of using the insulator 4, an insulating film may be formed by applying an insulating material to the divided core 3.

  In each of the above embodiments, the stator core 2 is formed by inserting the core segment 7 for one phase separately prepared into the divided cores 3 connected in an arc shape. However, the present invention is not limited to this, and the core segment 7 for two or more phases is used. May be inserted to form the stator core 2.

  The present invention can be used not only for a rotary drive type electric motor but also for a rotary drive type generator.

  DESCRIPTION OF SYMBOLS 1 ... Armature, 2 ... Stator core, 3, 3A, 3B ... Split core, 5 ... Coil, 621 ... Connection convex part, 622 ... Connection concave part, C ... Virtual circle, P ... Virtual point.

Claims (5)

A rotary drive type motor or generator armature,
A plurality of split cores connected to each other to form an annular stator core;
A coil wound around each split core,
At each end in the circumferential direction of each of the divided cores, a connecting convex portion or a connecting concave portion that fits each other and connects the divided cores is provided,
The armature, wherein the connection convex portion and the connection concave portion are formed along a circumference of a virtual circle centering on a virtual point outside the radial direction of the stator core. The armature according to claim 1,
The connection convex part and the connection concave part are larger than the first curvature radius with the fitting surface formed along the circumference having the first curvature radius centered on the virtual point and the virtual point as the center. An armature having a fitting surface formed along the circumference having a second radius of curvature. The armature according to claim 1 or 2,
The connection convex portion is provided at one end portion in the circumferential direction of each divided core, and the connection concave portion is provided at the other end portion, respectively.
Each of the divided cores is formed to have the same shape. A method of manufacturing a rotary drive type motor or generator armature,
A plurality of split cores that are connected to each other to form an annular stator core, the connecting convex portions or connecting concave portions formed along the circumference of a virtual circle centered on a virtual point on the radially outer side of the stator core. Forming a plurality of split cores at each end in the circumferential direction;
Arranging the plurality of divided cores in a straight line;
A coil is wound around each divided core,
Fitting the connecting convex part and the connecting concave part, connecting the plurality of divided cores excluding at least one split core in an arc shape;
The at least one split core is fitted between the circumferential ends of the split cores connected in the arc shape, and is slid along the axial direction of the stator core to connect the connecting convex portion and the connecting concave portion. A method for manufacturing an armature, characterized by fitting and connecting all divided cores. In the manufacturing method of the armature of Claim 4,
The electric motor or the generator is a polyphase AC type,
Each of the split cores alone or together with other adjacent split cores form a core segment according to the phase of the alternating current flowing through the coil,
A method of manufacturing an armature, characterized in that, as the at least one split core, the core segment is fitted between both ends in the circumferential direction of the split core connected in the arc shape to connect all the split cores. .

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