Stator and motor

Abstract

Divided sections are established in an annular portion (21a) of a stator core (21). The stator core includes a plurality of split cores (21x) divided for each tooth (21b). The annular portion is configured by connecting annular pieces (21c) of the plurality of split cores in an annular shape in the circumferential direction. Connecting portion are formed by corresponding annular pieces of the split cores adjacent to each other in the circumferential direction. The connecting portions comprise abutting portions (31b, 31c, 32b, 32c, 35b, 35c, 36b, 36c, 37b, 37c, 38b, 38c) where adjacent annular pieces mutually abut, and gap portions (33a, 33b, 33c), which are portions other than the abutting portions. Interposing bodies (24a, 24b) are interposed in at least a part of the gap portions to suppress relative positional deviation between the adjacent split cores.

Description

Stator and motor CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is based on Japanese Application No. 2024-33014, filed on March 5, 2024, the contents of which are incorporated herein by reference.

[0002] The present disclosure relates to a stator and a motor.

[0003] Some motor stators employ split cores, which are configured by dividing the stator core into individual teeth (see, for example, Patent Document 1). In stator cores in which the radially outer side is an annular portion and the teeth extend radially inward from the annular portion, the gap between the tips of adjacent teeth is narrow, so using split cores makes it easier to wind wires around each tooth.

[0004] Japanese Patent Application Laid-Open No. 2022-018961

[0005] In a stator using split cores, a conductor is wound around the teeth of each split core before they are joined together in an annular shape, and then the split annular portions are joined together in an annular shape. Therefore, a stator using split cores has a seam in the annular portion of the stator core, and therefore, compared to a stator that does not use split cores, it can be said that this structure requires more consideration for vibrations caused by magnetic excitation forces.

[0006] An object of the present disclosure is to provide a split-core type stator and motor that are capable of suppressing vibrations caused by magnetic excitation forces.

[0007] In a first aspect of the present disclosure, a stator comprises a stator core including a circular annular portion and a plurality of teeth arranged circumferentially around the annular portion and extending radially inward from the annular portion, and a coil formed of a conductor wound around each of the plurality of teeth, wherein the annular portion has division points, the stator core includes a plurality of split cores divided into each of the teeth, the annular portion is formed by connecting annular pieces of the plurality of split cores in a circumferential direction, and a connecting portion is formed by the annular pieces of the split cores adjacent in the circumferential direction, and the connecting portion has an abutment portion where adjacent annular pieces abut against each other, and a gap portion which is a portion other than the abutment portion, and an intermediate body is interposed in at least a portion of the gap portion to suppress relative positional misalignment between adjacent split cores.

[0008] According to the above configuration, at the connecting portions formed by the annular pieces of circumferentially adjacent split cores, the adjacent annular pieces abut against each other at the abutment portions, and the annular portions of the stator core are rigidly connected in an annular shape. Intervening bodies are interposed in at least some of the gaps other than the abutment portions, suppressing relative positional deviation between adjacent split cores. In other words, by providing the intervening bodies to create a structure that makes it difficult for relative positional deviation between adjacent split cores to occur, it is possible to suppress vibrations that may occur in the stator due to magnetic excitation forces.

[0009] In a second aspect of the present disclosure, a motor includes the stator described above and a rotor that is driven to rotate by receiving a rotating magnetic field generated by the stator. This configuration suppresses vibrations caused by magnetic excitation forces that may occur in the stator even when a split-core type is used, thereby achieving the advantageous effect of using a split-core type, such as easier wire winding, as well as the effect of reducing motor vibration.

[0010] The above and other objects, features, and advantages of the present disclosure will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which Fig. 1 is a perspective view of a stator and motor according to one embodiment, Fig. 2 is a side view of the stator according to the same embodiment, Fig. 3 is an enlarged view of a main portion of the stator according to the same embodiment, Fig. 4 is an enlarged view of a main portion of the stator according to the same embodiment, Fig. 5 is an enlarged view of a main portion of the stator according to the same embodiment, Fig. 6 is an enlarged view of a main portion of the stator according to a modified example, and Fig. 7 is an enlarged view of a main portion of the stator according to the modified example.

[0011] An embodiment of a stator and a motor will be described below. (Configuration of Motor 10) As shown in Figures 1 and 2, the motor 10 includes a stator 11 having an annular shape and a rotor 12 rotatably disposed radially inside the stator 11. The stator 11 generates a rotating magnetic field on its inner circumferential surface facing the rotor 12 when current is applied to a coil 23 (described later) attached to the stator 11. The rotor 12 is rotated by receiving the rotating magnetic field generated by the stator 11.

[0012] 1 and 3, the stator 11 includes a stator core 21 having an annular shape, and a coil 23 attached to the stator core 21 via an insulator 22. The stator 11 of this embodiment also includes a molded portion 24 formed by molding predetermined portions of both the coil 23 and the stator core 21 with mold resin 24x.

[0013] The stator core 21 is formed, for example, by laminating magnetic metal plates. The stator core 21 has an annular portion 21a on the radially outer side and teeth 21b extending radially inward from the annular portion 21a. A plurality of teeth 21b are provided at equal intervals around the circumferential direction of the annular portion 21a. A coil 23 is attached to each tooth 21b by winding a conductor 23x in a concentrated manner. The coils 23 wound around each tooth 21b are electrically connected by a three-phase connection. Three-phase drive power is supplied to the three-phase connection coils 23 from a motor control device (not shown).

[0014] The stator 11 of this embodiment is a split-core type. That is, the stator core 21 is composed of a plurality of split cores 21x, each split for each tooth 21b. The split cores 21x are set at midpoints between circumferentially adjacent teeth 21b in the annular portion 21a of the stator core 21.

[0015] Before the split cores 21x are joined together in an annular shape to form the stator core 21, the conductor wires 23x are wound around the teeth 21b of the split cores 21x via insulators 22. The split cores 21x are formed into annular portions 21a by abutting one circumferential end 21c1 of one annular piece 21c with the other circumferential end 21c2 of the adjacent annular piece 21c. The split cores 21x are then integrally fixed together by attaching a fixing ring (not shown) to the outer circumferential surface of the annular portion 21a. In this embodiment, a concave-convex joint is used to join adjacent annular pieces 21c. After the stator core 21 is formed into an annular shape, a wiring support member 25 is attached to the axial end face of the stator core 21, and the terminals of the conductor wires 23x extending from the coils 23 are routed to the wiring support member 25.

[0016] 3, 4, and 5, in the stator core 21 of this embodiment, the split cores 21x are connected using a concave-convex connection. That is, one circumferential end 21c1 of each annular piece 21c of the split core 21x is provided with a convex portion 31 that is convex in the circumferential direction when connected in an annular shape. The other circumferential end 21c2 of each annular piece 21c is provided with a concave portion 32 that is concave in the circumferential direction when connected in an annular shape.

[0017] At one circumferential end 21c1 of the annular piece 21c, the convex portion 31 is located in the radial center of the annular piece 21c. The radially inner side of the convex portion 31 at the circumferential end 21c1 is configured as an inner linear portion 31x extending along the radial direction, and the radially outer side of the convex portion 31 is configured as an outer linear portion 31y extending along the radial direction. The convex portion 31 has a trapezoidal convex shape, with its tip end narrower than its base end. The tip end of the convex portion 31 is a vertex linear portion 31a extending along the radial direction parallel to the linear portions 31x and 31y. The two oblique sides of the convex portion 31 are an inner oblique side portion 31b and an outer oblique side portion 31c that extend linearly from the inner linear portion 31x and the outer linear portion 31y toward the corresponding ends of the vertex linear portion 31a, narrowing toward each other.

[0018] At the other circumferential end 21c2 of the annular piece 21c, the recessed portion 32 is located in the radial center of the annular piece 21c. The radially inner side of the recessed portion 32 at the other circumferential end 21c2 is configured as an inner linear portion 32x extending along the radial direction, and the radially outer side of the recessed portion 32 is configured as an outer linear portion 32y extending along the radial direction. The recessed portion 32 has a trapezoidal recess that fits into the convex portion 31, and its bottom is a bottom linear portion 32a that extends along the radial direction parallel to the linear portions 32x and 32y. The two oblique sides of the recessed portion 32 are an inner oblique side portion 32b and an outer oblique side portion 32c that extend linearly from the inner linear portion 32x and the outer linear portion 32y toward the corresponding ends of the bottom linear portion 32a so as to narrow toward each other.

[0019] When connecting the annular pieces 21c of circumferentially adjacent split cores 21x, the convex portion 31 of the one circumferential end 21c1 of the annular piece 21c located on one side of the circumferential direction is fitted into the concave portion 32 of the other circumferential end 21c2 of the annular piece 21c located on the other side of the circumferential direction. At this time, both oblique sides 31b, 31c of the convex portion 31 abut against both oblique sides 32b, 32c of the concave portion 32. Because the abutting inner oblique sides 31b, 32b and outer oblique sides 31c, 32c intersect with each other on extension lines, the fitting of the concave portion 32 and the convex portion 31 results in a connection in which relative movement between adjacent split cores 21x is restricted.

[0020] Meanwhile, the bottom linear portion 32a of the recessed portion 32 and the top linear portion 31a of the convex portion 31 are not in contact with each other, forming a gap between them. This gap is a central gap 33a serving as a first gap located at the radial center of the annular portion 21a. The central gap 33a is a gap surrounded by the contact portions of the oblique sides 31b, 32b of the convex portion 31 and the recessed portion 32 and the contact portions of the oblique sides 31c, 32c. The inner linear portion 32x of the other circumferential end portion 21c2 and the inner linear portion 31x of the one circumferential end portion 21c1 are also not in contact with each other, forming a gap between them. This gap is an inner diameter side gap 33b serving as a second gap located on the inner diameter side of the annular portion 21a. The inner diameter side gap 33b is a gap that is closed on its outer diameter side by the abutment portions of the oblique sides 31b, 32b of the convex portion 31 and the concave portion 32, while being open on its inner diameter side. The outer linear portion 32y of the other circumferential end portion 21c2 and the outer linear portion 31y of the one circumferential end portion 21c1 are also set not to abut on each other, forming a gap between them. This gap is the outer diameter side gap 33c, which serves as a third gap located on the outer diameter side of the annular portion 21a. The outer diameter side gap 33c is a gap that is closed on its inner diameter side by the abutment portions of the oblique sides 31c, 32c of the convex portion 31 and the concave portion 32, while being open on its outer diameter side.

[0021] The formation of each of the above-mentioned gaps 33a, 33b, and 33c can be easily achieved by configuring the convex portion 31 to be relatively larger than the concave portion 32, where the concave portion 32 and the convex portion 31 have similar shapes.

[0022] 1 and 2, the stator core 21, in which the conductors 23x are arranged, has a molded portion 24 in which predetermined portions including the conductors 23x are resin-sealed with molded resin 24x. The molded portion 24 serves to protect the conductors 23x by embedding and resin-sealing the conductors 23x. The molded portion 24 bulges in the axial direction from the axial end face of the stator core 21 and fills the spaces between adjacent teeth 21b.

[0023] In other words, a mold (not shown) having a cavity corresponding to the molded portion 24 to be formed is placed in contact with the inner and outer circumferential portions of the stator core 21 and further placed at a predetermined distance from the axial end face of the stator core 21. Molten molding resin 24x is then poured into the cavity of the mold by injection molding and solidified to produce the molded portion 24 in which the conductors 23x and the like are embedded. The tip connection portions of the terminal ends of the conductors 23x protrude from the molded portion 24 to the outside, allowing connection to a control device or the like that controls the flow of current to the coil 23.

[0024] (Function of Molded Portion 24) In addition to protecting the conductor wires 23x wound around the stator core 21 by sealing them with resin, the molded portion 24 also serves to increase the rigidity of the connecting portions of the split cores 21x in this embodiment.

[0025] 3, 4, and 5, the stator core 21 of this embodiment has gaps 33a, 33b, and 33c around the abutting portions where the recessed portions 32 and the protruding portions 31 of adjacent annular pieces 21c are fitted together at the connecting portions of the split cores 21x. When the molded portion 24 is produced, molten molding resin 24x before solidification is poured into the central gap 33a and the inner diameter side gap 33b of the gaps 33a, 33b, and 33c in this embodiment, to fill the molding resin 24x. When the molding resin 24x solidifies, it is present in the gaps 33a and 33b as resin inclusions 24a and 24b. In other words, by inserting the resin interposing bodies 24a, 24b into each gap portion 33a, 33b, the structure is such that relative positional misalignment between adjacent split cores 21x is unlikely to occur, thereby suppressing vibrations caused by magnetic excitation forces that may occur in the stator 11.

[0026] The molding resin 24x is not filled into the outer diameter side gap 33c. The outer diameter side gap 33c is open to the outer periphery of the stator core 21, preventing the molding resin 24x from leaking out from the outer periphery. The inner diameter side of the outer diameter side gap 33c is closed by the contact portions between the oblique sides 31c, 32c of the convex portion 31 and the concave portion 32, so that the stator core 21 itself can easily prevent the molding resin 24x from flowing from the central gap 33a into the outer diameter side gap 33c.

[0027] (Operation of this embodiment) The operation of this embodiment will be described. In the split-core stator 11 of this embodiment, at the connection portions between the annular pieces 21c of circumferentially adjacent split cores 21x, the abutting portions of the fitting portions between the concave portions 32 and the convex portions 31 of the split cores 21x and the adjacent annular pieces 21c abut against each other. The abutting portions are the oblique sides 32b, 32c of the concave portions 32 and the oblique sides 31b, 31c of the convex portions 31, both of which are trapezoidal. Due to this abutment, the annular portions 21a of the stator core 21 are connected to each other in an annular shape by rigid bodies.

[0028] In addition, among the gaps 33a, 33b, and 33c provided other than the abutment portions, the central gap 33a and the inner diameter side gap 33b are provided with resin intervening bodies 24a and 24b, which are part of the molded portion 24. This suppresses relative positional deviation between adjacent split cores 21x. In other words, by providing the resin intervening bodies 24a and 24b to make it difficult for relative positional deviation between adjacent split cores 21x to occur, it is possible to suppress vibrations due to magnetic excitation forces that may occur in the stator 11. This also leads to effects such as reducing the vibration of the motor 10.

[0029] (Advantages of the Present Embodiment) The advantages of the present embodiment will be described. (1) The stator 11 of the present embodiment, which uses a split core mold, is configured such that the abutting portions of the mating portions of the concave portions 32 and convex portions 31 of the annular pieces 21c of the split cores 21x and the adjacent annular pieces 21c abut against each other at the connecting portions formed by the annular pieces 21c of the split cores 21x adjacent in the circumferential direction. That is, the annular portions 21a of the stator core 21 are connected to each other in an annular shape by rigid bodies. Similarly, at the connecting portions, the central gap 33a and the inner diameter side gap 33b are interposed with resin inclusions 24a, 24b formed by flowing and solidifying the mold resin 24x that constitutes the molded portion 24. This configuration suppresses relative positional misalignment between adjacent split cores 21x, resulting in a structure that is less likely to cause positional misalignment, thereby suppressing vibrations that may occur in the stator 11 due to magnetic excitation forces. In other words, even when a split core type is used, vibrations due to magnetic excitation forces that may occur in the stator 11 can be suppressed, so in addition to the advantageous effects of using a split core type, such as making it easier to wind the conductor 23x, it is expected that the motor 10 will have lower vibrations.

[0030] (2) The resin inclusions 24a, 24b in the gaps 33a, 33b to be filled are made of the molded resin 24x that is a part of the molded part 24 that seals predetermined portions including the conductive wires 23x. This eliminates the need to prepare a separate material for the inclusions, making the process simple.

[0031] (3) The annular pieces 21c of circumferentially adjacent split cores 21x are connected to each other by a concave-convex connection formed by the engagement of the concave portions 32 and the convex portions 31. The concave portions 32 are trapezoidally concave, and the convex portions 31 are trapezoidally convex. The use of this concave-convex connection more reliably prevents misalignment of the split cores 21x. Additionally, the trapezoidal shape of the convex-convex portions and the pair of trapezoidal oblique sides 31b, 31c, 32b, 32c as the abutting portions more reliably restrict relative movement of the split cores 21x in the insertion direction of the convex portions 31 into the concave portions 32 and in the direction perpendicular thereto. This structure further reduces misalignment of the split cores 21x. Furthermore, the engagement of the convex portions 31, each with a narrow trapezoidal top and bottom, with the concave portions 32 restricts movement of adjacent split cores 21x toward each other.

[0032] (4) At the mating portion between the recessed portion 32 and the protruding portion 31, a pair of trapezoidal oblique sides 31b, 31c, 32b, 32c abut against each other as abutting portions, and the pair of abutting portions divide each gap 33a, 33b, 33c into three locations. Of these, resin intervening bodies 24a, 24b are present in two locations: a central gap 33a serving as a first gap between the pair of abutting portions, and an inner diameter side gap 33b serving as a second gap located on the inner diameter side. On the other hand, no resin intervening body is present in an outer diameter side gap 33c serving as a third gap located on the outer diameter side. By selectively filling the molded resin 24x by dividing the spaces into sections formed by the pair of abutting portions, the stator 11 itself can easily prevent the molded resin 24x from flowing into undesired spaces.

[0033] (Modifications) This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility.

[0034] Of the central gap 33a, the inner diameter side gap 33b, and the outer diameter side gap 33c defined by a pair of abutting portions, the resin intervening bodies 24a, 24b are interposed in the central gap 33a and the inner diameter side gap 33b. However, the positions of the intervening bodies are not limited to this and may be changed as appropriate. An intervening body may be intervened in only one of the central gap 33a, the inner diameter side gap 33b, and the outer diameter side gap 33c. Alternatively, an intervening body may be intervened in any two gaps other than the combination of the central gap 33a and the inner diameter side gap 33b. Alternatively, an intervening body may be intervened in all of the central gap 33a, the inner diameter side gap 33b, and the outer diameter side gap 33c.

[0035] The connecting portion of the split core 21x uses a concave-convex connection, and the convex portion 31 having a narrow trapezoidal convex shape at the top and the concave portion 32 having a narrow trapezoidal concave shape at the bottom fit together, but the concave-convex shape is not limited to this and may be changed as appropriate.

[0036] For example, as shown in FIG. 6 , a convex portion 35 having a trapezoidal convex shape with a wide top and a concave portion 36 having a trapezoidal concave shape with a wide bottom may be fitted together. The convex portion 35 and the concave portion 36 also abut against each other at inner oblique sides 35b, 36b and outer oblique sides 35c, 36c, respectively. This pair of abutting portions defines a central gap 33a between the top linear portion 35a of the convex portion 35 and the bottom linear portion 36a of the concave portion 36, an inner diameter side gap 33b located on the inner diameter side of the inner oblique sides 35b, 36b, and an outer diameter side gap 33c located on the outer diameter side of the outer oblique sides 35c, 36c. Resin inclusions 24a, 24b are interposed in the central gap 33a and the inner diameter side gap 33b as part of the molded portion 24. The engagement between the inverted trapezoidal convex portion 35 and the concave portion 36 can restrict the movement of adjacent split cores 21x away from each other. Note that other shapes such as a rectangle or a polygon may be used in addition to the trapezoidal shape.

[0037] 7, a semicircular convex convex portion 37 and a semicircular concave concave portion 38 may be fitted together. The convex portion 37 and the concave portion 38 also abut against each other as a pair of abutting portions, namely, inner abutting portions 37b, 38b and outer abutting portions 38c, 38c. This pair of abutting portions defines a central gap 33a between the outer peripheral edge 37a of the convex portion 37 and the inner peripheral edge 38a of the concave portion 36, an inner diameter side gap 33b located on the inner diameter side of the inner abutting portions 37b, 38b, and an outer diameter side gap 33c located on the outer diameter side of the outer abutting portions 37c, 38c. Resin inclusions 24a, 24b are interposed in the central gap 33a and the inner diameter side gap 33b as part of the molded portion 24. As in the above embodiment, the engagement between the semicircular convex portion 37 and the concave portion 38 can restrict the direction in which adjacent split cores 21 x approach each other. Note that, in addition to the semicircular shape that is entirely curved, other shapes such as a shape with a curved portion or an elliptical shape may also be used.

[0038] Although not shown, the connecting portions of the split cores 21x do not necessarily have to be recessed and projecting joints. The split cores 21x may have one or more contact portions and gaps defined by the contact portions, with an intervening body interposed in at least a portion of the gaps.

[0039] The resin interposing bodies 24a, 24b interposed in the gaps are made of the molded resin 24x that is part of the molded portion 24, but the interposing bodies may be made of other materials. For example, the adhesive that secures the adjacent split cores 21x may be used as the interposing body. Furthermore, a damping material that has a damping effect may be used as the interposing body.

[0040] The configurations of the stator 11 and the motor 10 may be modified as appropriate in ways other than those described above. While the present disclosure has been described with reference to the embodiments, it is understood that the present disclosure is not limited to those embodiments or structures. The present disclosure also encompasses various modifications and modifications within the scope of equivalents. In addition, various combinations and forms, including only one element, more than one element, or less than one element, are also within the scope and spirit of the present disclosure.

[0041] (Note) The technical ideas that can be understood from the above-described embodiment and modified examples will be described. [1] A stator core (21) including an annular portion (21a) having an annular shape and a plurality of teeth (21b) provided in the circumferential direction of the annular portion and extending radially inward from the annular portion, and a coil (23) formed by conductor wires (23x) wound around each of the plurality of teeth, wherein division portions are set in the annular portion, the stator core includes a plurality of split cores (21x) divided for each of the teeth, the annular portion is formed by connecting annular pieces (21c) of the plurality of split cores in an annular shape in the circumferential direction, and a connecting portion is formed between the annular pieces of the split cores adjacent in the circumferential direction, The connecting portion has abutment portions (31b, 31c, 32b, 32c, 35b, 35c, 36b, 36c, 37b, 37c, 38b, 38c) where adjacent annular pieces abut against each other, and gap portions (33a, 33b, 33c) which are portions other than the abutment portions, and an interposing body (24a, 24b) is interposed in at least a part of the gap portion to suppress relative positional deviation between adjacent divided cores.

[0042] [2] The stator according to the above [1], further comprising a molded portion (24) formed by resin sealing a predetermined portion including the conductor, and the intervening body interposed in the gap portion is part of the molded resin (24x) that constitutes the molded portion.

[0043] [3] The stator according to the above [1] or [2], wherein one circumferential end (21c1) of the annular piece of the split core is provided with a convex portion (31, 35, 37), and the other circumferential end (21c2) of the annular piece is provided with a concave portion (32, 36, 38), and the annular pieces of the split core adjacent in the circumferential direction are connected to each other by a concave-convex connection formed by fitting the concave portion into the convex portion.

[0044] [4] The abutment portion is one of a pair of abutment portions provided at a fitting portion between the concave portion and the convex portion, and the gap portion is partitioned into three locations by the pair of abutment portions, The stator according to the above-mentioned [3], wherein, of the three gap portions defined by the pair of abutment portions, the intervening bodies (24a, 24b) are interposed in two places: a first gap portion (33a) provided between the pair of abutment portions (31b, 31c, 32b, 32c, 35b, 35c, 36b, 36c, 37b, 37c, 38b, 38c) and a second gap portion (33b) provided radially inward of the abutment portions (31b, 32b, 35b, 36b, 37b, 38b) located radially inward of the stator core, while no intervening body is interposed in a third gap portion (33c) provided radially outward of the abutment portions (31c, 32c, 35c, 36c, 37c, 38c) located radially outward of the stator core.

[0045] [5] The stator according to the above [3] or [4], wherein the convex portion (31, 35) has a trapezoidal convex shape, and the concave portion (32, 36) has a trapezoidal concave shape that fits into the convex portion, or the convex portion (37) has a semicircular convex shape, and the concave portion (38) has a semicircular concave shape that fits into the convex portion.

[0046] [6] A motor comprising: the stator (11) according to any one of [1] to [5] above; and a rotor (12) that is rotationally driven by receiving a rotating magnetic field generated by the stator.

Claims

1. A stator core (21) including an annular portion (21a) having a circular ring shape and a plurality of teeth (21b) arranged circumferentially around the annular portion and extending radially inward from the annular portion; and a coil (23) formed by conductor wires (23x) wound around each of the plurality of teeth, wherein division portions are set in the annular portion, the stator core includes a plurality of split cores (21x) divided into each of the teeth, the annular portion is formed by connecting annular pieces (21c) of the plurality of split cores in a ring shape in the circumferential direction, and a connecting portion is formed between the annular pieces of the split cores adjacent in the circumferential direction, The connecting portion has abutment portions (31b, 31c, 32b, 32c, 35b, 35c, 36b, 36c, 37b, 37c, 38b, 38c) where adjacent annular pieces abut against each other, and gap portions (33a, 33b, 33c) which are portions other than the abutment portions, and an interposing body (24a, 24b) is interposed in at least a part of the gap portion to suppress relative positional deviation between adjacent divided cores.

2. A stator as described in claim 1, comprising a molded portion (24) formed by resin sealing a predetermined portion including the conductor, and the intervening body interposed in the gap is part of the molded resin (24x) that constitutes the molded portion.

3. A stator as described in claim 1, wherein one circumferential end (21c1) of the annular piece of the split core is provided with a convex portion (31, 35, 37) and the other circumferential end (21c2) of the annular piece is provided with a concave portion (32, 36, 38), and circumferentially adjacent annular pieces of the split core are connected to each other by a concave-convex connection formed by the fitting of the concave portion with the convex portion.

4. The abutment portion is one of a pair of abutment portions provided at the fitting portion between the concave portion and the convex portion, and the gap portion is divided into three portions by the pair of abutment portions, 4. The stator according to claim 3, wherein, of the three gaps partitioned by the pair of abutment portions, the intervening bodies (24a, 24b) are interposed in two locations: a first gap (33a) provided between the pair of abutment portions (31b, 31c, 32b, 32c, 35b, 35c, 36b, 36c, 37b, 37c, 38b, 38c) and a second gap (33b) provided radially inward of the abutment portions (31b, 32b, 35b, 36b, 37b, 38b) located radially inward of the stator core, while no intervening body is interposed in a third gap (33c) provided radially outward of the abutment portions (31c, 32c, 35c, 36c, 37c, 38c) located radially outward of the stator core.

5. A stator according to claim 3, wherein the convex portions (31, 35) are trapezoidal convex, and the concave portions (32, 36) are trapezoidal concave and fit with the convex portions, or the convex portion (37) is semicircular convex, and the concave portion (38) is semicircular concave and fit with the convex portion.

6. A motor comprising: a stator (11) according to any one of claims 1 to 5; and a rotor (12) that is driven to rotate by receiving a rotating magnetic field generated by the stator.

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