CN110870171A - Structure, stator, and motor - Google Patents

Abstract

The structure has: a cylindrical support surface extending in a magnetic core direction of the coil; and a coil formed of a wire wound around the support surface. The support surface has a rectangular shape in which long sides and short sides are alternately arranged when viewed in the core direction. That is, the support surface has a pair of first support surfaces corresponding to the short sides and a pair of second support surfaces corresponding to the long sides. At least one of the pair of first support surfaces has a protrusion protruding toward the lead. The top of the protrusion is located inward of both ends of the first support surface in the short-side direction.

Description

Structure, stator, and motor

Technical Field

The present invention relates to a structure including a coil, a stator including the structure, and a motor having the stator.

Background

Conventionally, a coil of a motor is formed by winding a wire around a tooth as a core with an insulator interposed therebetween. A plurality of such coils are arranged around a central axis in the motor. In order to arrange many coils around the central axis, the cross-sectional shape of the teeth may be a rectangular shape that is long in the axial direction and short in the circumferential direction.

For example, japanese patent application laid-open nos. 2003-190951 and 2010-519471 describe structures of teeth, insulators, and coils included in conventional motors.

Patent document 1: japanese patent laid-open publication No. 2003-190951

Patent document 2: japanese patent application laid-open No. 2010-519471

Disclosure of Invention

Problems to be solved by the invention

When the wire is wound around the teeth with the insulator interposed therebetween, the wire may bulge in the circumferential direction. In particular, when the cross-sectional shape of the teeth is the above-described rectangular shape, the protrusions (bulges) of the lead with respect to both end surfaces in the circumferential direction of the insulator become large. The more a wire having a large wire diameter is used, the more conspicuous the rise of the wire is generated. In order to arrange more coils around the central axis, it is required to suppress the bulging of the wire.

The present invention aims to provide a structure capable of suppressing a wire from bulging from a support surface in a structure including a coil.

Means for solving the problems

A first exemplary aspect of the present invention is a structure including a coil, the structure including: a cylindrical support surface extending in a core direction of the coil; and the coil, it is formed by the wire that is wound on the said supporting surface, when observing along the direction of the said magnetic core, the said supporting surface is the quadrilateral shape that the long side and short side are arranged alternately, have a pair of first supporting surfaces equivalent to said short side and a pair of second supporting surfaces equivalent to said long side, at least one in said a pair of first supporting surfaces has protruding portion that is projected towards the said wire, the top of the said protruding portion locates at the position closer to the inside than both ends of the said short side direction of the said first supporting surface.

Effects of the invention

According to the exemplified first invention of the present application, the wire is bent at an obtuse angle from the top of the protrusion toward the second support surface. This can suppress the wire from bulging at the second support surface, as compared with the case where the wire is bent at a right angle.

Drawings

Fig. 1 is a longitudinal sectional view of the motor.

Fig. 2 is a perspective view of the first resin member.

Fig. 3 is a plan view of a portion of the stator core and the insulator.

Fig. 4 is a sectional view of the stator core and the insulator as viewed from a-a position of fig. 3.

Fig. 5 is a cross-sectional view of the tooth and insulator as viewed from a-a of fig. 3.

Fig. 6 is a diagram showing a comparative example in the case where there is no protrusion.

Fig. 7 is a sectional view of a modified tooth and an insulator.

Fig. 8 is a sectional view of a tooth and an insulator according to a modification.

Fig. 9 is a sectional view of a tooth and an insulator according to a modification.

Detailed Description

Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. In the present application, a direction parallel to the central axis of the motor is referred to as an "axial direction", a direction perpendicular to the central axis of the motor is referred to as a "radial direction", and a direction along an arc centered on the central axis of the motor is referred to as a "circumferential direction". In the present application, the shapes and positional relationships of the respective portions will be described with the axial direction as the vertical direction and the bus bar assembly side as the upper side with respect to the stator. However, the orientation of the motor of the present invention during manufacture and during use is not intended to be limited by the definition of the vertical direction.

The "parallel direction" also includes a substantially parallel direction. The "vertical direction" also includes a substantially vertical direction.

< 1. integral structure of motor

Fig. 1 is a longitudinal sectional view of a motor 1 according to an embodiment of the present invention. The motor 1 of the present embodiment is mounted on, for example, an automobile, and is used as a drive source for generating a drive force of an electric power steering apparatus. However, the motor according to the embodiment of the present invention may be used for applications other than power steering. For example, the motor according to one embodiment of the present invention may be used as a drive source for other parts of the automobile, for example, an engine cooling fan or an oil pump. The motor according to one embodiment of the present invention may be mounted in a home appliance, Office Automation (OA) equipment, medical equipment, or the like, and generate various driving forces.

As shown in fig. 1, the motor 1 includes a stationary portion 2 and a rotating portion 3. The stationary unit 2 is fixed to a housing of a device to be driven. The rotating portion 3 is supported to be rotatable with respect to the stationary portion 2.

The stationary portion 2 of the present embodiment includes a housing 21, a stator 22, a bus bar assembly 23, a lower bearing portion 24, and an upper bearing portion 25.

The housing 21 includes a cylindrical portion 211, a bottom plate portion 212, and a lid portion 213. The cylindrical portion 211 extends in a substantially cylindrical shape in the axial direction on the outer side in the radial direction of the stator 22 and the bus bar assembly 23. The bottom plate portion 212 extends substantially perpendicularly to the center axis 9 at a position below the stator 22 and a rotor 32 described later. The cover 213 is extended substantially perpendicularly to the center axis 9 at a position above the bus bar assembly 23. The stator 22, the bus bar assembly 23, and a rotor 32 described later are housed in an internal space of the housing 21.

The material of the cylindrical portion 211, the bottom plate portion 212, and the lid portion 213 is, for example, metal such as aluminum or stainless steel. In the present embodiment, the cylindrical portion 211 and the bottom plate portion 212 are formed of one member, and the lid portion 213 is formed of another member. However, the cylindrical portion 211 and the cover portion 213 may be formed of one member, and the bottom plate portion 212 may be formed of another member. The materials of the cylindrical portion 211, the bottom plate portion 212, and the lid portion 213 may be other materials.

The stator 22 is disposed radially outward of the rotor 32 described later. The stator 22 has a stator core 41, a plurality of insulators 42, and a plurality of coils 43. In the present embodiment, the stator core 41 is a laminated steel sheet in which a plurality of electromagnetic steel sheets are laminated in the axial direction. The stator core 41 has an annular core back 411 and a plurality of teeth 412 protruding radially inward from the core back 411. The core back 411 is arranged substantially coaxially with the central axis 9. The outer peripheral surface of the core back 411 is fixed to the inner peripheral surface of the cylindrical portion 211 of the housing 21. The plurality of teeth 412 are arranged at substantially equal intervals in the circumferential direction. The stator core 41 may be a dust core or the like instead of the laminated steel sheet.

In the present embodiment, the material of the insulating member 42 is a resin as an insulator. The stator 22 of the present embodiment has an insulator 42 at each tooth. At least a part of the surface of the stator core 41 is covered with an insulator 42. Specifically, at least the upper surface, the lower surface, and both circumferential end surfaces of each tooth 412 of the surface of the stator core 41 are covered with the insulator 42. Each insulating member 42 has a first resin part 421 and a second resin part 422. The second resin member 422 is located below the first resin member 421. The first resin member 421 is attached to the stator core 41 from the upper surface side of the stator core 41. The second resin member 422 is attached to the stator core 41 from the lower surface side of the stator core 41.

More detailed configuration of the insulating member 42 will be described later.

The coil 43 is formed of a conductive wire 430 wound around the insulator 42. That is, in the present embodiment, the lead wire 430 is wound around the teeth 412 as the magnetic core via the insulator 42. The insulator 42 is sandwiched between the teeth 412 and the coil 43, thereby preventing the teeth 412 and the coil 43 from being electrically short-circuited.

The bus bar assembly 23 includes a bus bar 51 made of metal such as copper as a conductor, and a resin-made bus bar holder 52 for holding the bus bar 51. The bus bar 51 is electrically connected to the lead wire 430 constituting the coil 43. When the motor 1 is used, a lead wire extending from an external power supply (not shown) is connected to the bus bar 51. That is, the coil 43 and the external power supply are electrically connected via the bus bar 51. In addition, a circuit board may be provided in the housing 21 instead of the bus bar assembly 23. Further, the coil 43 and an external power source may be electrically connected via a circuit board.

The lower bearing portion 24 and the upper bearing portion 25 are disposed between the housing 21 and the shaft 31 on the rotating portion 3 side. In the present embodiment, the lower bearing portion 24 and the upper bearing portion 25 use ball bearings that relatively rotate the outer ring and the inner ring via balls. The outer ring of the lower bearing portion 24 is fixed to a bottom plate portion 212 of the housing 21. The outer race of the upper bearing portion 25 is fixed to the lid portion 213 of the housing 21. The inner rings of the lower bearing portion 24 and the upper bearing portion 25 are fixed to the shaft 31. Thereby, the shaft 31 is supported rotatably with respect to the housing 21. However, instead of the ball bearing, another type of bearing such as a slide bearing or a fluid bearing may be used.

The rotating portion 3 of the present embodiment includes a shaft 31 and a rotor 32.

The shaft 31 is a columnar member extending along the center axis 9. The shaft 31 is made of a metal such as stainless steel. The shaft 31 is supported by the lower bearing portion 24 and the upper bearing portion 25, and is rotatable about the central axis 9. The upper end 311 of the shaft 31 protrudes upward from the lid 213. The upper end 311 of the shaft 31 is coupled to a device to be driven via a power transmission mechanism such as a gear. The shaft 31 does not necessarily protrude upward in the axial direction from the lid 213. That is, the bottom portion 212 may be provided with a through hole through which the lower end portion of the shaft passes to protrude downward from the bottom portion 212. The shaft 31 may be a hollow member.

The rotor 32 is located radially inside the stator 22 and rotates together with the shaft 31. The rotor 32 includes a rotor core 61, a plurality of magnets 62, and a magnet holder 63. In the present embodiment, the rotor core 61 is a laminated steel sheet in which a plurality of electromagnetic steel sheets are laminated in the axial direction. The rotor core 61 has a through hole 60 extending in the axial direction at the center thereof. The shaft 31 is press-fitted into the through hole 60 of the rotor core 61. Thereby, the rotor core 61 and the shaft 31 are fixed to each other. Further, a member such as a bush may be disposed between the inner surface constituting the through hole 60 and the outer surface of the shaft 31. That is, the shaft 31 and the rotor core 61 may be directly fixed or indirectly fixed. The rotor core 61 may be a dust core or the like instead of the laminated steel sheet.

The plurality of magnets 62 are fixed to the outer peripheral surface of the rotor core 61 with an adhesive, for example. The radially outer surface of each magnet 62 serves as a magnetic pole surface facing the radially inner end surface of the tooth 412. The plurality of magnets 62 are arranged in the circumferential direction such that N poles and S poles are alternately arranged. Instead of the plurality of magnets 62, one annular magnet may be used in which N poles and S poles are alternately magnetized in the circumferential direction.

The magnet holder 63 is a resin member fixed to the rotor core 61. The magnet holder 63 is obtained by insert molding using the rotor core 61 as an insert member, for example. The lower surfaces and both circumferential end surfaces of the plurality of magnets 62 are in contact with the magnet holder 63. Thereby, the respective magnets 62 are positioned in the circumferential direction and the axial direction. Further, the rigidity of the entire rotor 32 is improved by the magnet holder 63. The plurality of magnets 62 may be fixed to the rotor core 61 by molding using resin, or may be indirectly fixed to the rotor core 61 using another member.

When a drive current is supplied from an external power supply to the coil 43 via the bus bar 51, magnetic flux is generated in the plurality of teeth 412 of the stator core 41. Then, a circumferential torque is generated by the action of the magnetic flux between the teeth 412 and the magnet 62. As a result, the rotating portion 3 rotates about the central axis 9 with respect to the stationary portion 2.

< 2. construction of insulator and coil

Next, a structure in which the lead wire 430 constituting the coil 43 is wound around the insulator 42 will be described in more detail. Fig. 2 is a perspective view of the first resin part 421. Fig. 3 is a plan view of a part of the stator core 41 and the insulator 42. Fig. 4 is a sectional view of the stator core 41 and the insulator 42 as viewed from a-a position in fig. 3. In fig. 4, hatching showing a cross section of the insulating member 42 is omitted. Hereinafter, the direction in which the teeth 412 serving as the core of the coil 43 extend is referred to as "core direction".

As shown in fig. 2 to 4, the insulating member 42 has a cylindrical support surface 70 extending in the core direction. The bearing surface 70 has a pair of first bearing surfaces 71 and a pair of second bearing surfaces 72. When viewed in the core direction, the support surface 70 has a rectangular shape in which short sides and long sides are alternately arranged around the teeth 412. The first support surface 71 is a surface corresponding to the short side. The second support surface 72 is a surface corresponding to the long side. Hereinafter, a direction along the short side is referred to as a "short side direction", and a direction along the long side is referred to as a "long side direction".

In the present embodiment, the upper surface and the lower surface of the insulator 42 serve as the first support surface 71. Both end surfaces of the insulator 42 in the circumferential direction serve as second support surfaces 72. The first resin member 421 includes the upper surface of the insulating member 42 as one of the pair of first supporting surfaces 71. The second resin member 422 includes the lower surface of the insulator 42 which is the other of the pair of first supporting surfaces 71.

The lead wire 430 constituting the coil 43 is wound around the support surface 70 of the insulator 42. The support surface 70 and the coil 43 constitute an example of the "structure" of the present invention. The lead wire 430 is in contact with the support surface 70 of one of the insulators 42 with respect to the winding start portion of the insulator 42. The winding end portion of the conductive wire 430 with respect to one of the insulators 42 is farther from the support surface 70 than the winding start portion. The conductive wire 430 is wound around the support surface 70 a plurality of times from the winding start portion toward the winding end portion.

By shortening the length of the first support surface 71 in the short direction, the plurality of coils 43 can be arranged closely in the circumferential direction. Further, by increasing the length of the second support surface 72 in the longitudinal direction, the magnetic path inside each coil 43 can be enlarged. The length of the second support surface 72 in the longitudinal direction is preferably 5 times or more the length of the first support surface 71 in the lateral direction, for example.

The pair of first support surfaces 71 each have a protrusion 73. The projection 73 of the first resin member 421 projects upward. The protrusion 73 of the second resin member 422 protrudes downward. That is, the protrusion 73 protrudes toward the lead 430. As shown in fig. 4, the protrusion 73 is a substantially triangular protrusion when viewed in the core direction. The protrusion 73 has a top 730, a first inclined surface 731, and a second inclined surface 732. The top 730 is located inward of both ends of the first support surface 71 in the short direction. The first inclined surface 731 is located upstream of the top 730 in the winding direction of the conductive wire 430. The second inclined surface 732 is located downstream of the top 730 in the winding direction of the wire 430.

Fig. 5 is a cross-sectional view of the tooth 412 and insulator 42 from the position a-a of fig. 3. Fig. 6 is a diagram showing a comparative example in the case where the projection 73 is not provided. In fig. 5 and 6, the winding direction of the wire from the winding start portion to the winding end portion is indicated by an arrow of a two-dot chain line. As shown in fig. 6, when the projection 73 is not provided, the lead wire 430X is bent at substantially right angles from the first support surface 71X toward the second support surface 72X. In this case, the bulge (bulge) of the wire 430X at the second support surface 72X becomes large. This increases the circumferential width of the coil.

In contrast, in the present embodiment, as shown in fig. 5, the lead 430 is bent at an obtuse angle from the top 730 of the protrusion 73 toward the second support surface 72. Therefore, compared with the case of fig. 6, bulging (bulging) of the wire 430 at the second bearing surface 72 is suppressed. In other words, the wire 430 is intended to be raised at the first supporting surface 71, whereby the raising of the wire 430 at the second supporting surface 72 can be suppressed. In this way, the width of the coil 43 in the circumferential direction can be reduced as compared with the case of fig. 6. As a result, the plurality of coils 43 can be closely arranged in the circumferential direction while preventing the conductive wires 430 of the adjacent coils 43 from contacting each other.

According to the configuration of the present embodiment, the number of windings of the wire 430 with respect to one tooth 412 can be increased within a limited circumferential range. In addition, the diameter of the wound wire 430 can also be increased, thereby allowing a greater current to flow. This can increase the output of the motor 1. In addition, according to the structure of the present embodiment, the bending angle of the lead 430 is an obtuse angle over the entire periphery of the support surface 70. Therefore, the load applied to the wires 430 can be reduced, thereby suppressing the breakage of the wires 430.

In particular, in the projection 73 of the present embodiment, the angle θ 2 of the second inclined surface 732 with respect to the short direction is larger than the angle θ 1 of the first inclined surface 731 with respect to the short direction. The top 730 of the projection 73 is located downstream of the center of the first support surface 71 in the lateral direction in the winding direction of the conductive wire 430. In this way, the path of the lead wire 430 from the top 730 of the projection 73 to the second support surface 72 can be made to be an obtuse angle closer to 180 °. This can further suppress the protrusion of the lead wire 430 with respect to the second support surface 72.

As shown in fig. 5, the conductive wire 430 includes a first lap 431 and a second lap 432. The first bridging portion 431 is a portion of the conductive wire 430 that extends from the end on the upstream side in the winding direction of the first supporting surface 71 toward the top 730 of the protruding portion 73. The second bridging portion 432 is a portion of the end of the conductive wire 430 on the downstream side in the winding direction from the top 730 of the protruding portion 73 toward the first supporting surface 71. In the present embodiment, the angle θ 4 of the second lap portion 432 with respect to the short direction is larger than the angle θ 3 of the first lap portion 431 with respect to the short direction. Thereby, the bulging of the lead wire 430 with respect to the second support surface 72 is further suppressed.

In the present embodiment, both of the pair of first support surfaces 71 have the protruding portions 73. Therefore, the bulging of the wire 430 with respect to one second supporting surface 72 and the bulging of the wire 430 with respect to the other second supporting surface 72 are both suppressed. As a result, the width of the coil 43 in the circumferential direction can be further reduced.

In the present embodiment, the projection 73 provided on one of the pair of first supporting surfaces 71 and the projection 73 provided on the other of the pair of first supporting surfaces 71 are arranged symmetrically with respect to the center line of the supporting surface 70. In this way, the shape of the first resin member 421 can be made the same as the shape of the second resin member 422, and the members can be made common. This can reduce the manufacturing cost of the motor 1. However, the projection 73 provided on one of the pair of first supporting surfaces 71 and the projection 73 provided on the other of the pair of first supporting surfaces 71 may be asymmetrical with respect to the center line of the supporting surface 70.

The motor 1 of the present embodiment is a so-called inner rotor type motor in which the rotor 32 is positioned radially inward of the stator 22. In the case of the inner rotor type, the coils 43 adjacent in the circumferential direction are easily accessible to each other. However, according to the configuration of the present embodiment, the wire 430 can be prevented from bulging in the circumferential direction. Therefore, the wires 430 of the adjacent coils 43 can be suppressed from contacting each other.

< 3. modification example >

While one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment.

Fig. 7 is a cross-sectional view of a modified tooth 412A and an insulator 42A. In fig. 7, the winding direction of the conductive wire 430A from the winding start portion toward the winding end portion is indicated by an arrow of a two-dot chain line.

In fig. 7, the pair of first support surfaces 71A also have projections 73A projecting toward the lead 430A, respectively. However, in the example of fig. 7, the first support surface 71A is formed as a triangular projection 73A as a whole. That is, the first inclined surface 731A of each projection 73A extends from the top 730A of the projection 73A toward the end on the upstream side in the winding direction of the first support surface 71A. The second inclined surface 732A of each projection 73A extends from the top 730A of the projection 73A toward the end on the downstream side in the winding direction of the first support surface 71A.

In fig. 7, the lead 430A is also bent at an obtuse angle from the top 730A of the projection 73A toward the second support surface 72A. Therefore, the bulging (bulging) of the wire 430A at the second bearing surface 72A is suppressed. Therefore, the width of the coil in the circumferential direction can be reduced. As a result, the plurality of coils can be closely arranged in the circumferential direction while preventing the lead wires 430A of the adjacent coils from contacting each other.

In fig. 7, the first lap 431A of the conductive wire 430A extends along the first inclined surface 731A, and the second lap 432A of the conductive wire 430A extends along the second inclined surface 732A. Therefore, the positions of the first bridge 431A and the second bridge 432A can be stabilized. As a result, winding collapse of the coil and damage to the lead wire 430A can be further suppressed. In fig. 7, the boundary between the first inclined surface 731A and the second support surface 72A is a gently continuous curved surface. Thereby, damage of the lead wire 430A is further suppressed.

Fig. 8 is a cross-sectional view of the tooth 412B and the insulator 42B according to another modification. In fig. 8, the winding direction of the conductive wire 430B from the winding start portion toward the winding end portion is indicated by an arrow of a two-dot chain line.

In fig. 8, the pair of first support surfaces 71B have a first projection 73B and a second projection 74B, respectively. The second projection 74B is located on the downstream side in the winding direction from the first projection 73B. In such a configuration, the wire 430B is also bent at an obtuse angle from the top 740B of the second protrusion 74B toward the second support surface 72B. Therefore, bulging (bulging) of the wire 430B at the second bearing surface 72B is suppressed. Therefore, the width of the coil in the circumferential direction can be reduced. As a result, the plurality of coils can be closely arranged in the circumferential direction while preventing the lead wires 430B of the adjacent coils from contacting each other.

In fig. 8, the height of the second protrusion 74B is higher than the height of the first protrusion 73B. In this way, the path of the lead wire 430B from the top 740B of the second protrusion 74B to the second support surface 72B can be made to be an obtuse angle closer to 180 °. This can further suppress the lead wire 430B from bulging from the second support surface 72B.

Fig. 9 is a sectional view of a tooth 412C and an insulator 42C according to another modification. In fig. 9, the winding direction of the conductive wire 430C from the winding start portion toward the winding end portion is indicated by an arrow of a two-dot chain line.

In fig. 9, one of the pair of first support surfaces 71C has a protrusion 73C. The other of the pair of first supporting surfaces 71C is an inclined surface 75C that gradually protrudes from the upstream end toward the downstream end in the winding direction. In this way, the projection 73C may be provided only on one of the pair of first support surfaces 71C. Even in this case, the bulging (bulging) of the lead wire 430C at least one of the pair of second bearing surfaces 72C is suppressed. Therefore, the width of the coil in the circumferential direction can be reduced.

In the above embodiment and modification, the insulator is composed of the following two members: a first resin member including one of a pair of first supporting surfaces; and a second resin member including the other of the pair of first supporting surfaces. However, the insulating member may have a single cylindrical resin member including both the pair of first supporting surfaces.

In the above embodiment and modification, the lead wire is wound around the teeth of the stator core with the insulating material interposed therebetween. Therefore, a cylindrical support surface for supporting the lead is provided on the insulator. However, the insulator may be omitted and the lead wire may be wound directly around the teeth of the stator core whose surface is insulation-coated. In this case, the teeth themselves may have the same shape of the support surface of the insulator.

In the above-described embodiment and modification, a so-called inner rotor type motor in which the rotor is positioned radially inward of the stator has been described. However, the structure, the stator, and the motor according to the present invention may be applied to a so-called outer rotor type motor in which the rotor is positioned radially outward of the stator.

In the above embodiment and modification, the structure included in the motor is described. However, the structure of the present invention may be included in a device other than a motor such as a generator.

The plurality of magnets are not necessarily located on the outer peripheral surface of the rotor core. At least a part of the magnet may be embedded in the rotor core.

The motor may have a control board for controlling the energization of the stator. In this case, the control substrate is electrically connected to the bus bar. In addition, the motor may not have a bus bar assembly. In this case, the lead is electrically connected to a connector or the like connected to an external power supply. In addition, when the motor has a control board, the motor may not have a bus bar assembly. In this case, the lead wire is electrically connected to the control substrate without passing through the bus bar assembly.

The detailed shapes of the respective members may be different from those shown in the drawings of the present application. The respective elements appearing in the above-described embodiments or modifications may be appropriately combined within a range not to contradict each other.

Industrial applicability

The present invention can be used for a structure including a coil, a stator including the structure, and a motor including the stator.

Description of the reference symbols

1: a motor; 2: a stationary portion; 3: a rotating part; 9: a central axis; 21: a housing; 22: a stator; 23: a bus bar assembly; 24: a lower bearing portion; 25: an upper bearing portion; 31: a shaft; 32: a rotor; 41: a stator core; 42. 42A, 42B, 42C: an insulating member; 43: a coil; 70: a bearing surface; 71. 71A, 71B, 71C: a first bearing surface; 72. 72A, 72B, 72C: a second bearing surface; 73. 73A, 73C: a protrusion portion; 73B: a first protrusion; 74B: a second protrusion; 75C: an inclined surface; 411: the back of the iron core; 412. 412A, 412B, 412C: teeth; 421: a first resin member; 422: a second resin member; 430. 430A, 430B, 430C: a wire; 431. 431A: a first lap joint portion; 432. 432A: a second lap joint portion; 730. 730A, 740B: a top portion; 731. 731A: a first inclined surface; 732. 732A: a second inclined surface.

Claims (18)

1. A structure comprising a coil, wherein,

the structure has:

a cylindrical support surface extending in a core direction of the coil; and

the coil is composed of a wire wound around the support surface,

the support surface has a quadrilateral shape in which long sides and short sides are alternately arranged when viewed in the core direction, and has a pair of first support surfaces corresponding to the short sides and a pair of second support surfaces corresponding to the long sides,

at least one of the pair of first support surfaces has a protrusion protruding toward the lead,

the top of the protrusion is located inward of both ends of the first support surface in the short direction.

2. The construct of claim 1 wherein,

the conductive wire is wound around the support surface in a winding direction from a winding start portion that is in contact with the support surface toward a winding end portion that is farther from the support surface than the winding start portion,

the apex portion is located on a downstream side in the winding direction from a center in the short side direction of the first support surface.

3. The construct of claim 2 wherein,

the protrusion has:

a first inclined surface located on an upstream side in the winding direction from the top portion; and

a second inclined surface located on a downstream side in the winding direction from the top portion,

an angle of the second inclined surface with respect to the short side direction is larger than an angle of the first inclined surface with respect to the short side direction.

4. The construct of claim 3 wherein,

the second inclined surface extends from the apex portion toward an end portion of the first support surface on a downstream side in the winding direction.

5. The construct of claim 3 or 4,

the first inclined surface extends from the apex portion toward an end portion on an upstream side in the winding direction of the first support surface.

6. The construct of any of claims 2 to 5, wherein,

the wire includes:

a first overlapping portion that faces the apex portion from an end portion on an upstream side in the winding direction of the first supporting surface; and

a second overlapping portion facing from the top portion to an end portion on a downstream side in the winding direction of the first support surface,

the angle of the second lap portion with respect to the short side direction is larger than the angle of the first lap portion with respect to the short side direction.

7. The construct of any of claims 2 to 6, wherein,

both of the pair of first supporting surfaces have the protruding portion,

the projection portion of one of the pair of first supporting surfaces and the projection portion of the other of the pair of first supporting surfaces are arranged symmetrically with respect to a center line of the supporting surface.

8. The construct of claim 1 wherein,

both of the pair of first supporting surfaces have the protruding portion,

the projection portion of one of the pair of first support surfaces and the projection portion of the other of the pair of first support surfaces are disposed asymmetrically with respect to a center line of the support surface.

9. The construct of any of claims 2 to 6, wherein,

one of the pair of first support surfaces has the protrusion,

the other of the pair of first support surfaces is an inclined surface that gradually protrudes from an upstream end toward a downstream end in the winding direction.

10. The construct of any of claims 1 to 9, wherein,

at least one of the pair of first support surfaces has a first protrusion and a second protrusion as the protrusion, the second protrusion being located on a downstream side in the winding direction from the first protrusion,

the second protrusion has a height greater than a height of the first protrusion.

11. The construct of any of claims 1 to 10 wherein,

the length of the second support surface in the long side direction is 5 times or more the length of the first support surface in the short side direction.

12. A stator comprising the structure of any one of claims 1 to 11,

the stator has:

a stator core;

a resin insulator covering at least a part of the stator core; and

the coil is provided with a plurality of coils,

the insulator has the bearing surface.

13. The stator according to claim 12,

the insulating member has:

a first resin member including one of the pair of first supporting surfaces; and

and a second resin member including the other of the pair of first supporting surfaces.

14. The stator according to claim 12,

the insulating member has a cylindrical resin member including both the pair of first supporting surfaces.

15. A stator comprising the structure of any one of claims 1 to 11,

the stator has:

a stator core, the surface of which is coated with insulation; and

the coil is provided with a plurality of coils,

the stator core has the bearing surface.

16. A motor, comprising:

the stator of any one of claims 12 to 15; and

a rotor that rotates relative to the stator.

17. The motor of claim 16,

the rotor is located radially inward of the stator.

18. The motor according to claim 16 or 17,

the motor is a driving source of the electric power steering apparatus.

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