Stator and motor

Abstract

To provide a split-core type stator and motor that can suppress vibrations caused by magnetic excitation forces.SOLUTION: In a stator 11 employing a split core configuration, at the connection portions between annular pieces 21c of circumferentially adjacent split cores 21x, abutting portions of fitting sections of concave portions 32 and convex portions 31 formed on the respective annular pieces 21c are brought into mutual contact, whereby the annular portions 21a of the stator core 21 are annularly connected via rigid bodies. Furthermore, resin inclusions 24a and 24b, formed by the inflow and solidification of mold resin 24x constituting a molded portion 24, are interposed within a central gap portion and an inner diameter side gap portion at the connection area, thereby providing a structure that suppresses relative positional displacement between adjacent split cores 21x.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a stator and a motor. [Background technology]

[0002] 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 conductors around each tooth. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-018961 Summary of the Invention [Problem to be solved by the invention]

[0004] 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.

[0005] 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. [Means for solving the problem]

[0006] A stator according to one aspect of the present disclosure includes a stator core (21) having an annular portion (21a) having a ring 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 winding a conductor (23x) around the teeth, and the stator uses split cores (21x) divided for each of the teeth and having division points set in the annular portion, and annular pieces (21c) of the split cores are connected in an annular shape in the circumferential direction to form the annular portion. The stator (11) is configured such that, at the connection portions between the annular pieces of the split cores adjacent in the circumferential direction, abutment portions (31b, 31c, 32b, 32c, 35b, 35c, 36b, 36c, 37b, 37c, 38b, 38c) where the annular pieces themselves and the adjacent annular pieces abut against each other are configured as abutment portions (33a, 33b, 33c), and portions other than the abutment portions are configured as gap portions (33a, 33b, 33c), and intervening bodies (24a, 24b) are interposed in at least parts of the gap portions to suppress relative positional deviation between the adjacent split cores.

[0007] According to the above configuration, at the connection portions between the annular pieces of circumferentially adjacent split cores, the abutment portions of the annular pieces abut against each other, 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 misalignment between adjacent split cores. In other words, by providing the intervening bodies to create a structure that makes it difficult for relative misalignment between adjacent split cores to occur, it is possible to suppress vibrations that may occur in the stator due to magnetic excitation forces.

[0008] A motor according to one aspect of the present disclosure includes the stator (11) described above and a rotor (12) that is rotationally driven by a rotating magnetic field generated by the stator. With the above configuration, even when a split core type is used, vibrations caused by magnetic excitation forces that can occur in the stator can be suppressed, so in addition to the advantageous effects of using a split core type, such as easier winding of the conductor, it is possible to obtain effects such as reducing the vibration of the motor. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of a stator and a motor according to an embodiment. [Figure 2] FIG. 2 is a side view of the stator in the embodiment. [Figure 3] FIG. 3 is an enlarged view of a main part of the stator in the same embodiment. [Figure 4] FIG. 4 is an enlarged view of a main part of the stator in the same embodiment. [Figure 5] FIG. 5 is an enlarged view of a main part of the stator in the same embodiment. [Figure 6] FIG. 6 is an enlarged view of a main part of the stator in the modified example. [Figure 7] FIG. 7 is an enlarged view of a main part of the stator in the modified example. DETAILED DESCRIPTION OF THE INVENTION

[0010] An embodiment of a stator and a motor will be described below. (Configuration of motor 10) 1 and 2, motor 10 includes a stator 11 having an annular shape and a rotor 12 rotatably disposed radially inside stator 11. Stator 11 generates a rotating magnetic field on its inner circumferential surface facing rotor 12 when a current is applied to coils 23 (described later) attached to stator 11. Rotor 12 is rotated by the rotating magnetic field generated by stator 11.

[0011] (Configuration of stator 11) 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 a molded resin 24x.

[0012] 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 driving power is supplied to the three-phase connected coils 23 from a motor control device (not shown).

[0013] The stator 11 of this embodiment employs a split core. That is, the stator core 21 uses a plurality of split cores 21x that are split for each of the teeth 21b. The split cores 21x are set at the midpoints between the circumferentially adjacent teeth 21b in the annular portion 21a of the stator core 21.

[0014] 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 the insulators 22. The split cores 21x are formed into annular portions 21a by abutting one circumferential end 21c1 of the split cores 21x with the other circumferential end 21c2 of the adjacent annular portions 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 portions 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 terminal portions of the conductor wires 23x extending from the coils 23 are routed to the wiring support member 25.

[0015] (21x split core concave / convex connection) 3, 4, and 5, in the stator core 21 of this embodiment, a concave-convex connection is used for the connecting portions of the split cores 21x. That is, one circumferential end 21c1 of the annular pieces 21c of the split cores 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 the annular pieces 21c is provided with a concave portion 32 that is concave in the circumferential direction when connected in an annular shape.

[0016] 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 so as to narrow each other.

[0017] 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.

[0018] 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 the other circumferential side is fitted into the concave portion 32 of the other circumferential end 21c2 of the annular piece 21c located on one circumferential side. 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. The abutting inner oblique sides 31b, 32b and outer oblique sides 31c, 32c intersect with each other on extension lines, so that the fitting of the concave portion 32 and the convex portion 31 restricts the relative movement of the adjacent split cores 21x.

[0019] 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 void surrounded by the contact portion between the oblique sides 31b, 32b of the convex portion 31 and the recessed portion 32 and the contact portion between 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 portion between the oblique sides 31b, 32b of the convex-shaped portion 31 and the concave-shaped portion 32, while being open on its inner diameter side. The outer straight portion 32y of the other circumferential end portion 21c2 and the outer straight 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 portion between the oblique sides 31c, 32c of the convex-shaped portion 31 and the concave-shaped portion 32, while being open on its outer diameter side.

[0020] The formation 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.

[0021] (Configuration of molded part 24) 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 sealed with molded resin 24x. The molded portion 24 protects the conductors 23x by embedding and sealing them with resin. 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.

[0022] In other words, a mold (not shown) having a cavity corresponding to the molded portion 24 to be formed is provided in contact with the inner and outer circumferential portions of the stator core 21 and 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, thereby producing 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.

[0023] (Function of mold part 24) The molded portion 24 not only protects the conductor wires 23x wound around the stator core 21 by sealing them with resin, but also has the effect of increasing the rigidity of the connecting portions of the split cores 21x in this embodiment.

[0024] 3, 4, and 5, in the stator core 21 of this embodiment, gaps 33a, 33b, and 33c are provided 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 interposing the resin interposing bodies 24a, 24b in each gap portion 33a, 33b, a structure is created in which relative positional misalignment between adjacent split cores 21x is less likely to occur, thereby suppressing vibrations caused by magnetic excitation forces that may occur in the stator 11.

[0025] 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.

[0026] (Action 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 the split cores 21x adjacent in the circumferential direction, 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 using rigid bodies.

[0027] Additionally, 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 inclusions 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 inclusions 24a and 24b and creating a structure that makes it difficult for relative positional deviation to occur between adjacent split cores 21x, it is possible to suppress vibrations due to magnetic excitation forces that may occur in the stator 11. This also leads to the effect of reducing the vibration of the motor 10.

[0028] (Effects of this embodiment) The effects of this embodiment will be described. (1) In the stator 11 of this embodiment, which uses a split core mold, 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 that are circumferentially adjacent to each other at the connection portions between the split cores 21x are in contact with each other. That is, the annular portions 21a of the stator core 21 are connected to each other in an annular shape by rigid bodies. Similarly, in the connection portions, the central gap 33a and the inner diameter side gap 33b are filled with resin inclusions 24a, 24b formed by flowing and solidifying the mold resin 24x that constitutes the molded portion 24. This structure suppresses relative positional misalignment between adjacent split cores 21x, making it less likely to cause misalignment. This suppresses 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.

[0029] (2) The resin inclusions 24a and 24b in the gaps 33a and 33b to be filled are made of molded resin 24x, which 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.

[0030] (3) The annular pieces 21c of circumferentially adjacent split cores 21x are connected to each other by a recessed-convex connection formed by fitting the recessed portions 32 and the protruding portions 31. The recessed portions 32 are trapezoidally concave, and the protruding portions 31 are trapezoidally convex. Using this recessed-convex connection more reliably reduces the likelihood of misalignment between the split cores 21x. Additionally, the trapezoidal shape of the recessed-convex portions and the pair of trapezoidal oblique sides 31b, 31c, 32b, and 32c as the contact portions more reliably restrict relative movement between the split cores 21x in the insertion direction of the protruding portions 31 into the recessed portions 32 and in the direction perpendicular thereto. This structure further reduces the likelihood of misalignment between the split cores 21x. Furthermore, the fitting of the trapezoidally narrow convex portions 31 and the recessed portions 32 with narrow top and bottom portions restricts movement of adjacent split cores 21x toward each other.

[0031] (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 of the gaps 33a, 33b, 33c into three locations. Resin intervening bodies 24a, 24b are interposed in two of these locations: central gap 33a, which serves as a first gap between the pair of abutting portions, and inner diameter side gap 33b, which serves as a second gap located on the inner diameter side. Meanwhile, no resin intervening body is interposed in outer diameter side gap 33c, which serves as a third gap located on the outer diameter side. By selectively filling the molded resin 24x by dividing the space into sections defined by the pair of abutting portions, the stator 11 itself can easily prevent the molded resin 24x from flowing into undesired spaces.

[0032] (Example of change) This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility.

[0033] 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 inclusions 24a, 24b are interposed in the central gap 33a and the inner diameter side gap 33b. However, the locations of the inclusions are not limited to this and may be changed as appropriate. An inclusion may be interposed in only one of the central gap 33a, the inner diameter side gap 33b, and the outer diameter side gap 33c. Alternatively, an inclusion may be interposed in any two gaps other than the combination of the central gap 33a and the inner diameter side gap 33b. Alternatively, an inclusion may be interposed in all of the central gap 33a, the inner diameter side gap 33b, and the outer diameter side gap 33c.

[0034] 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.

[0035] 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 as a pair of abutting portions, namely, inner oblique sides 35b, 36b and outer oblique sides 35c, 36c. 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 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.

[0036] 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, i.e., 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 21x approach each other. Note that, in addition to the semicircular shape that is entirely curved, other shapes such as a partially curved shape or an elliptical shape may also be used.

[0037] Although not shown, the connecting portions of the split cores 21x do not necessarily have to be recessed and projecting joints. They 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.

[0038] Although the resin interposers 24a and 24b interposed in the gaps are made of molded resin 24x, which is part of molded portion 24, other materials may be used for the interposers. For example, adhesive that secures adjacent split cores 21x may be used as the interposer. Furthermore, a damping material that has a damping effect may be used for the interposer.

[0039] The configurations of the stator 11 and the motor 10 may be changed as appropriate in addition to those described above. (Addendum) The technical ideas that can be understood from the above-described embodiment and modified examples will be described.

[0040] [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; a coil (23) formed by winding a conducting wire (23x) around the teeth, A stator (11) using divided cores (21x) each divided for each tooth and having division points set in the annular portion, and annular pieces (21c) of the divided cores are connected annularly in a circumferential direction to form the annular portion, At the connection portions between the annular pieces of the divided cores adjacent in the circumferential direction, abutment portions (31b, 31c, 32b, 32c, 35b, 35c, 36b, 36c, 37b, 37c, 38b, 38c) are configured where the annular pieces themselves and the adjacent annular pieces abut against each other, and gap portions (33a, 33b, 33c) are configured in the portions other than the abutment portions, The stator is configured such that intervening bodies (24a, 24b) are interposed in at least a part of the gap to suppress relative positional deviation between adjacent divided cores.

[0041] [2] a molded portion (24) formed by sealing predetermined portions including the conductive wire with resin; The stator according to [1] above, wherein the interposing body interposed in the gap is a molding resin (24x) that constitutes the molding portion.

[0042] [3] The annular pieces of the split core are provided at one circumferential end portion (21c1) thereof with convex portions (31, 35, 37), and at the other circumferential end portion (21c2) thereof with concave portions (32, 36, 38), The stator according to the above [1] or [2], wherein the annular pieces of the divided cores adjacent in the circumferential direction are connected by a concave-convex connection in which the concave portions and the convex portions are fitted together.

[0043] [4] a pair of the abutting portions is provided at a fitting portion between the concave portion and the convex portion, and the gap portion is divided into three portions by the pair of the abutting portions; The stator according to [3] above, wherein, of the three gaps partitioned by a pair of the abutment portions, the intervening bodies (24a, 24b) are interposed in two locations: a first gap (33a) provided between a pair of the 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.

[0044] [5] The convex portions (31, 35) have a trapezoidal convex shape, and the concave portions (32, 36) have a trapezoidal concave shape that fits into the convex portions, or The stator according to the above [3] or [4], wherein 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.

[0045] [6] The stator (11) according to any one of the above [1] to [5], a rotor (12) that is driven to rotate by receiving a rotating magnetic field generated by the stator. [Explanation of symbols]

[0046] 11 stator, 12 rotor, 21 stator core, 21a annular portion, 21b teeth, 21c annular piece, 21x divided core, 23 coil, 23x conducting wire, 24 molded portion, 24a resin interposer (interposer), 24b resin interposer (interposer), 24x molded resin, 31 convex portion, 32 concave portion, 31b, 32b inner oblique side portion (abutment portion), 31c, 32c outer oblique side portion (abutment portion), 33a central gap portion (gap portion, first gap portion), 33b inner diameter side gap portion (gap portion, second gap portion), 33c outer diameter side gap portion (gap portion, third gap portion), 35 convex portion, 36 concave portion, 35b, 36b inner oblique side portion (abutment portion), 35c, 36c Outer hypotenuse part (contact part), 37 convex part, 38 concave part, 37b, 38b inner contact part (contact part), 37c, 38c outer contact part (contact part)

Claims

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; a coil (23) formed by winding a conducting wire (23x) around the teeth; A stator (11) using divided cores (21x) each divided for each tooth and having a division point set in the annular portion, and annular pieces (21c) of the divided cores are connected annularly in a circumferential direction to form the annular portion, At the connection portions between the annular pieces of the divided cores adjacent in the circumferential direction, abutment portions (31b, 31c, 32b, 32c, 35b, 35c, 36b, 36c, 37b, 37c, 38b, 38c) where the annular pieces themselves and the adjacent annular pieces abut against each other are configured, and gap portions (33a, 33b, 33c) are configured in the portions other than the abutment portions, The stator is configured such that intervening bodies (24a, 24b) are interposed in at least a part of the gap to suppress relative positional deviation between adjacent divided cores.

2. a molded portion (24) configured by resin sealing a predetermined portion including the conductive wire; 2. The stator according to claim 1, wherein the intervening body interposed in the gap is a molding resin (24x) that constitutes the molding portion.

3. Convex portions (31, 35, 37) are provided at one circumferential end (21c1) of the annular piece of the split core, and concave portions (32, 36, 38) are provided at the other circumferential end (21c2) of the annular piece, 2. The stator according to claim 1, wherein the annular pieces of the divided cores adjacent in the circumferential direction are connected by a concave-convex connection formed by fitting the concave portions with the convex portions.

4. a pair of the abutting portions is 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 the abutting portions; 4. The stator according to claim 3, wherein the intervening body (24a, 24b) is interposed in two of the three gaps defined by a pair of the abutment portions: a first gap (33a) formed between the pair of the abutment portions (31b, 31c, 32b, 32c, 35b, 35c, 36b, 36c, 37b, 37c, 38b, 38c) and a second gap (33b) formed radially inward of the abutment portions (31b, 32b, 35b, 36b, 37b, 38b) located radially inside the stator core; and the intervening body (24a, 24b) is interposed in a third gap (33c) formed radially outward of the abutment portions (31c, 32c, 35c, 36c, 37c, 38c) located radially outside the stator core.

5. The convex portions (31, 35) have a trapezoidal convex shape, and the concave portions (32, 36) have a trapezoidal concave shape that fits into the convex portions, or 4. The stator according to claim 3, wherein 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.

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

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