Motor stator structure, motor and fan

Abstract

To provide a stator structure for a motor having a high strength stator core.SOLUTION: A stator structure includes: a plurality of core units 311 mutual ends of which are joined to each other along a circumferential direction of a motor to form an annular stator core. Each core unit includes half-tooth portions 3121 and 3122 and a yoke portion. The half-tooth portions are provided at both ends of the yoke portion, respectively. Each half-tooth portion is provided with connection portions 3141 or 3142. Adjacent two half-tooth portions in the two core units in a circumferential direction are connected together by each of the connection portions. According to the stator structure for the motor concerning an embodiment of the present invention, setting up a joint location on the half-tooth portions reduces influence of the joint location upon the yoke portion, to ensure increasing stator core strength.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to the technical field of motors, and more particularly to a stator structure for a motor, a motor including the stator structure for a motor, and a fan including the motor. [Background technology]

[0002] In the related art, the stator core of the hollow motor is made by punching out a ring from a plate and then laminating the plates, but the material in the center is wasted, which results in low material utilization and high motor costs. In the industry, a joining method is sometimes used in which the yoke of the stator core is joined, but in the case of a hollow motor, the yoke of the stator core is very narrow, and this type of stator structure has very low strength, reliability and manufacturability.

[0003] In addition, the motor stator and bushing are often connected in a tight fit along the circumference, but in order to ensure sufficient mechanical strength of the stator yoke, the stator yoke cannot be made narrow (the thickness of the stator yoke must be 6 mm or more), which results in waste of material and increased motor costs. Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention aims to solve at least one of the above technical problems in the prior art to some extent. To this end, the present invention proposes a motor stator structure in which a stator core is formed by joining half teeth together, thereby making the stator core stronger.

[0005] The present invention also proposes a motor having the above-mentioned motor stator structure.

[0006] The present invention also provides a fan equipped with the above motor. [Means for solving the problem]

[0007] A stator structure for a motor according to one embodiment of the present invention includes a plurality of core units whose ends are joined together along a circumferential direction of the motor to form an annular stator core, each of the core units including a half-tooth portion and a yoke portion, the half-tooth portions being provided at both ends of the yoke portion, each of the half-tooth portions being provided with a connecting portion, and two adjacent half-tooth portions of two of the core units being connected in the circumferential direction by their respective connecting portions.

[0008] According to the motor stator structure of the embodiment of the present invention, by setting the joint position on the half tooth portion, the influence of the joint position on the yoke portion is reduced, and it is ensured that the strength of the stator core is increased.

[0009] According to some embodiments of the present invention, the core unit further includes a full tooth portion provided on the yoke portion and positioned between the two half tooth portions at both ends.

[0010] According to some embodiments of the invention, two said half teeth form one said full tooth after being connected by their respective connecting portions.

[0011] According to some embodiments of the present invention, one of the half teeth of the core unit is provided with a groove, and the other half teeth is provided with a protrusion, and the groove and the protrusion are configured as the connection portion.

[0012] According to some embodiments of the invention, each half tooth has a connection side suitable for connecting with another adjacent half tooth, and the groove is recessed from the connection side or the protrusion protrudes from the connection side.

[0013] According to some embodiments of the present invention, in the radial direction of the motor, the recess or the protrusion is located at a central position of the corresponding connecting side surface.

[0014] According to some embodiments of the present invention, the two axial end faces of the protrusion are flush with the two axial end faces of the corresponding half-tooth portion, respectively, and the groove extends along the axial direction of the motor and penetrates the two axial end faces of the corresponding half-tooth portion.

[0015] According to some embodiments of the present invention, an opening width of the groove is smaller than a width of a base of the groove, and the protrusion is adapted to a shape of the groove.

[0016] According to some embodiments of the present invention, a ratio of a radial width of the yoke portion to a circumferential width of all the teeth is between 1 / 2 and 2 / 3.

[0017] According to some embodiments of the present invention, a ratio of a circumferential width of the connection portion to a circumferential width of the entire tooth portion is between 0.15 and 0.4.

[0018] According to some embodiments of the present invention, when the radial width of the core unit is F, the circumferential width of the entire tooth portion is D, and the radial width of the yoke portion is E, D, E, and F satisfy the relational expression E+0.5D≦F≦E+D.

[0019] According to some embodiments of the present invention, the core unit has an arc-shaped structure, and a ratio between an inner diameter of the core unit and an outer diameter of the core unit is 0.6 to 0.95.

[0020] According to some embodiments of the present invention, the stator structure further includes an annular insulating frame fixed to both axial ends of the stator core, the insulating frame having an insertion portion that is inserted between at least two adjacent full tooth portions, and the insertion portion has a winding relief groove.

[0021] According to some embodiments of the present invention, the insulating frame at least at one end has a frame retaining ring that protrudes in the axial direction of the stator core toward a side away from the core unit.

[0022] A motor according to an embodiment of the second aspect of the present invention includes the above-described stator structure for a motor.

[0023] A fan according to an embodiment of the third aspect of the present invention includes the motor and a fan blade that is rotationally driven by the motor.

[0024] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. [Brief description of the drawings]

[0025] [Figure 1] FIG. 2 is a schematic diagram of a core unit. [Diagram 2] FIG. 2 is a schematic diagram of a stator core. [Diagram 3] FIG. 2 is a schematic assembly diagram of a stator core and an insulating frame. [Figure 4] FIG. 2 is a schematic perspective view of an insulating frame having a frame retaining ring. [Diagram 5] FIG. 2 is a plan view of an insulating frame having a frame retaining ring. [Figure 6] FIG. 2 is a front view of an insulating frame having a frame retaining ring. [Explanation of symbols]

[0026] 31 Stator core 311 Core Unit 312 Half tooth 3121 First half tooth section 3122 Second half tooth section 313 York 314 Connection 3141 First Connection 3142 Second Connection 315 All teeth 3161 1st connection side 3162 Second Connection Side 317 Winding groove 318 Stopper structure 33 First insulating frame 331 Frame retaining ring 332 Frame body 333 Fitting part 34 Second insulating frame 35 Winding relief groove DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] The embodiments of the present invention will be described in detail below, and the examples of the embodiments are shown in the drawings in which the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are merely examples for interpreting the present invention, and cannot be understood as limitations on the present invention.

[0028] In describing the present invention, the orientations or positional relationships indicated by the terms "length," "width," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outer," etc. are orientations or positional relationships based on the drawings and are intended merely to make the description of the present invention more convenient and simple. They do not indicate or imply that the devices or elements in question must have a specific orientation, be configured in a specific direction, and operate in a specific orientation, and therefore should not be understood as limitations on the present invention.

[0029] Additionally, the terms "first" and "second" are for descriptive purposes only and cannot be understood to indicate or imply a relative importance or to imply a number of the indicated technical features. Thus, a feature qualified as "first" or "second" may explicitly or implicitly include one or more of said features. In the description of the present invention, "plurality" means at least two, e.g., two, three, etc., unless otherwise expressly and specifically limited.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "attached", "connected", "coupled", "fixed" and the like should be understood in a broad sense, such as fixed connection, detachable connection or integration, mechanical connection, electrical connection or mutual communication, direct connection or indirect connection through an intermediate medium, internal communication between two elements, or interactive relationship between two elements. For ordinary technical personnel in this field, the specific meaning of the above terms in the present invention can be understood according to the specific situation.

[0031] Hereinafter, a motor stator structure according to an embodiment of the present invention will be described in detail with reference to FIGS.

[0032] 1 and 2, a motor stator structure according to an embodiment of the present invention may include a plurality of core units 311 whose ends are joined together along the circumferential direction of the motor to form an annular stator core 31. For example, in the specific example shown in Fig. 2, three core units 311 are joined together at their ends along the circumferential direction of the motor to form a complete annular stator core 31.

[0033] Alternatively, the core unit 311 may be constructed by laminating soft magnetic materials.

[0034] Each core unit 311 can include half-tooth portions 312 provided on both ends of the yoke portion 313, and the yoke portion 313, and each half-tooth portion 312 is provided with a connecting portion 314, and in the circumferential direction, two adjacent half-tooth portions 312 of the two core units 311 are connected to each other by their respective connecting portions 314. Specifically, the half tooth portion 312 of each core unit 311 includes a first half tooth portion 3121 provided at one end of the yoke portion 313 and a second half tooth portion 3122 provided at the other end of the yoke portion 313, the connection portion 314 includes a first connection portion 3141 provided at the first half tooth portion 3121 and a second connection portion 3142 provided at the second half tooth portion 3122, and the first connection portion 3141 in the first half tooth portion 3121 of one core unit 311 is connected to the second connection portion 3142 in the second half tooth portion 3122 of an adjacent core unit 311, thereby realizing the joining of two adjacent core units 311. Without using fasteners, it is possible to reduce the weight of the stator structure, reduce the assembly steps, reduce costs, and reduce the number of man-hours.

[0035] According to the motor stator structure of the embodiment of the present invention, the joint position of two adjacent core units 311 is set on the half tooth portion 312, thereby reducing the influence of the joint position on the yoke portion 313, increasing the strength of the stator core 31, and avoiding waste of the central material when punching the entire stator core, reducing the loss of the core material, reducing the weight of the stator structure, reducing the cost of the stator structure, and reducing the difficulty of the process. In addition, the stator structure of the embodiment of the present invention can make the yoke portion 313 thinner, realizing an ultra-thin ring width in the radial direction and a large hollow area. By realizing an ultra-thin ring width in the radial direction of the motor, the ring width of the annular motor can be made very thin (≦bearing ring width + 6 mm), and a motor with a thin and large diameter structure can be provided, which makes the shape of the entire device more diverse and ensures the structural strength and electrical safety of the annular motor.

[0036] 1 and 2, the core unit 311 may include a full tooth portion 315 provided on the yoke portion 313 and positioned between two half tooth portions 312 at both ends. Specifically, one end of the yoke portion 313 is a first half tooth portion 3121, the other end of the yoke portion 313 is a second half tooth portion 3122, and the full tooth portion 315 is positioned between the first half tooth portion 3121 and the second half tooth portion 3122. The number of the full tooth portions 315 is a plurality, for example, five or six, and a winding groove 317 is formed between two adjacent full tooth portions 315, and the stator winding is wound in the winding groove 317.

[0037] In some embodiments of the present invention, two half-tooth portions 312 are connected by respective connecting portions 314 to form one full-tooth portion 315. The circumferential width of each full-tooth portion 315 is equal, and the circumferential distance between any two adjacent full-tooth portions 315 is equal, so that the structure of the stator core 31 is uniform.

[0038] In the case of the stator core 31, the total number of the teeth 315 is selectively 15 or more and 45 or less, and the total number of the teeth 315 is an integer multiple of three.

[0039] In some embodiments of the present invention, one half tooth portion 312 of the core unit 311 is provided with a groove, and the other half tooth portion 312 is provided with a protrusion, and the groove and the protrusion form the connecting portion 314. In other words, the first connecting portion 3141 is a groove, and the second connecting portion 3142 is a protrusion. When two core units 311 are joined together, the groove of one core unit 311 fits into the protrusion of the adjacent core unit 311, thereby realizing the connection of the two core units 311.

[0040] In some embodiments of the present invention, each half tooth 312 has a connection side suitable for connection with another adjacent half tooth 312, with a groove recessed from the connection side or a protrusion protruding from the connection side. Specifically, the first half tooth 3121 has a first connection side 3161, with a groove recessed from the first connection side 3161. The second half tooth 3122 has a second connection side 3162, with a protrusion protruding from the second connection side 3162. When two adjacent core units 311 are joined together, the connection sides of the two core units 311 are in close contact with each other.

[0041] In some embodiments of the present invention, the groove or protrusion is located at the center of the corresponding connection side surface in the radial direction of the motor. For example, the groove is located at the center of the first connection side surface 3161, and the protrusion is located at the center of the second connection side surface 3162. In this way, the impact of the connection portion 314 on the strength of the half tooth portion 312 is reduced, and the strength of the stator core 31 is increased when multiple core units 311 are joined to one stator core 31.

[0042] In some embodiments of the present invention, the two axial end faces of the protrusion are flush with the two axial end faces of the corresponding half-tooth portion 312, respectively, and the groove extends along the axial direction of the motor and penetrates the two axial end faces of the corresponding half-tooth portion 312. In other words, the protrusion extends along the axial direction of the core unit 311, and the axial height of the protrusion is equal to the axial height of the half-tooth portion 312. Similarly, the groove extends along the axial direction of the core unit 311, and the axial height of the groove is equal to the axial height of the half-tooth portion 312.

[0043] In some embodiments of the present invention, the opening width of the groove is smaller than the width of the base of the groove, and the protrusion is adapted to the shape of the groove. In this way, both the groove and the protrusion are configured in a dovetail shape, and the groove and the adjacent protrusion form a dovetail joint. When the groove and the protrusion are fitted together, the connection strength is high and the two core units 311 are not easily separated. The protrusion can be inserted into the groove along the axial direction during assembly. The joint method using the tenon dovetail joint method can be used to efficiently and quickly connect the core units 311 closely. When punching the core units 311, it can be realized with a strip-shaped material, which can effectively improve the utilization rate of the material.

[0044] In some embodiments of the present invention, the ratio of the radial width of the yoke portion 313 to the circumferential width of the total teeth portion 315 is 1 / 2 to 2 / 3. Specifically, when the radial width of the yoke portion 313 is E and the circumferential width of the total teeth portion 315 is D, 1 / 2≦E / D≦2 / 3. If E / D exceeds 1 / 2 to 2 / 3, the utilization rate of the stator core 31 of the motor is low and the magnetic efficiency is low, so the number of teeth of the total teeth portion 315 of the motor cannot be made too large. Usually, the number of teeth of the total teeth portion 315 of permanent magnet outer rotor motors in the industry is concentrated at 6 to 12 teeth, and narrowing the annular shape of the stator core 31 is also restricted.

[0045] Alternatively, E / D may be 0.5, 0.55, 0.6, 0.66, etc. Of course, E / D may be other values ​​between 1 / 2 and 2 / 3, which will not be listed here one by one. A specific example is D=5mm, E=2.6mm, and E / D=0.52.

[0046] The circumferential width D of all teeth portion 315 is wider than the radial width E of yoke portion 313, and the dovetail joints are separated parallel to the direction of magnetic field flow without affecting the normal flow of magnetic flux, so that the efficiency of stator core 31 is not affected, and at the same time, high mechanical strength of stator core 31 is ensured after fitting.

[0047] In some embodiments of the present invention, the ratio of the circumferential width of the connecting portion 314 to the circumferential width of the entire tooth portion 315 is 0.15 to 0.4. Specifically, when the circumferential width of the connecting portion 314 is C and the circumferential width of the entire tooth portion 315 is D, 0.15 ≤ C / D ≤ 0.4. Optionally, C / D may be 0.15, 0.2, 0.3, 0.4, etc. Of course, C / D may also be other numerical values between 0.15 and 0.4, which will not be enumerated one by one here. When C / D < 0.15, since the circumferential width of the connecting portion 314 becomes small, the connection strength of the connecting portions 314 of two adjacent core units 311 becomes small. When C / D > 0.4, since the circumferential width of the connecting portion 314 becomes long, the magnetic resistance becomes too large, the heat generation and damage of the stator core 31 increase, and the efficiency of the motor decreases.

[0048] In a specific example, C = 1 mm, D = 5 mm, and C / D = 0.2.

[0049] In some embodiments of the present invention, when the radial width of the core unit 311 is F, the circumferential width of the entire tooth portion 315 is D, and the radial width of the yoke portion 313 is E, D, E, and F satisfy the relational expression of E + 0.5D ≤ F ≤ E + D. When F < E + 0.5D, since the radial width of the core unit 311 is too small, the stator winding process becomes difficult. Alternatively, since the circumferential width of the entire tooth portion 315 and the radial width of the yoke portion 313 are too large, the material utilization rate becomes low and the cost of the motor becomes high. When F > E + D, since the circumferential width of the entire tooth portion 315 and the radial width of the yoke portion 313 are too small, the magnetic path becomes too long, the loss becomes large, and the efficiency of the motor decreases.

[0050] Optionally, F = E + 0.76D. In a specific example, D = 5 mm, E = 2.6 mm, and F = 6.4 mm.

[0051] In some embodiments of the present invention, the core unit 311 has an arc-shaped structure, and the ratio of the inner diameter of the core unit 311 to the outer diameter of the core unit 311 is 0.6 to 0.95. When the inner diameter of the core unit 311 is R1 and the outer diameter of the core unit 311 is R2, 0.6≦R1 / R2≦0.95 is satisfied. Alternatively, R1 / R2 may be 0.7, 0.75, 0.8, 0.85, 0.9, etc. Of course, R1 / R2 may be other values ​​between 0.6 and 0.95, which will not be listed here one by one. When R1 / R2<0.6, the radial width of the core unit 311 (also called the ring width of the stator core 31) is large; when the outer diameter of the stator core 31 needs to be ensured, the inner hole of the stator core 31 is too small, which affects the air blowing effect of the hollow inner hole; when the inner diameter of the stator core 31 needs to be ensured, the outer diameter of the stator core 31 is too large, which affects the working area of ​​the fan blades, and thus affects the blowing air volume. When R1 / R2>0.95, the radial width of the entire tooth portion 315 and the radial width of the yoke portion 313 are too small, which causes the magnetic flux density of the stator core 31 to be high, the iron loss to be large, and the heat generation to be high, which affects the efficiency of the motor.

[0052] Optionally, R1 / R2 further satisfies 0.7≦R1 / R2≦0.9.

[0053] In a specific example, R1 and R2 are inner radius values, where R1=80.2 mm, R2=93 mm, and R1 / R2≈0.86.

[0054] By providing the stopper structure 318 on the inner peripheral surface of the core unit 311, when the stator core 31 is fitted around the outer periphery of another component of the motor, the stopper structure 318 can realize positioning and engagement with the component. For example, after the stator core 31 is fitted into the stator bush, the stopper structure 318 engages with the stator bush, effectively restricting the occurrence of circumferential sliding between the stator core 31 and the stator bush and preventing the occurrence of rattling between the stator core 31 and the stator bush, thereby preventing the occurrence of vibration and noise between the stator core 31 and the stator bush and at the same time avoiding deformation of the stator core 31 due to the interference fit between the stator bush and the stator core 31. In addition, when realizing circumferential positioning between the stator core 31 and the stator bush without relying on close contact along the circumference, the thickness of the yoke portion 313 of the stator core 31 can be set narrow, for example, to less than 6 mm.

[0055] Alternatively, the stopper structure 318 may be formed by protruding the inner circumferential surface of the core unit 311 or may be formed in a groove shape recessed from the inner circumferential surface of the core unit 311 .

[0056] In some embodiments of the present invention, the stator structure further includes an annular insulating frame fixed to both axial ends of the stator core 31. Specifically, the insulating frame includes a first insulating frame 33 fixed to one axial end of the stator core 31 and a second insulating frame 34 fixed to the other axial end of the stator core 31. The first insulating frame 33 and the second insulating frame 34 insulate and protect both axial ends of the stator core 31, thereby improving the safety of use of the stator structure. Each insulating frame may be an integral structure or an annular structure formed by joining a plurality of frame parts. In addition, by fitting the annular insulating frames to both ends of the stator core 31, separation between the two adjacent core units 311 is not easy, and the structural stability of the annular stator core 31 can be further improved. In the industry, some low-voltage permanent magnet outer rotor motors use an insulating layer coating method to achieve insulation of the stators. However, this method only provides an insulating protection effect and does not contribute to the circumferential strength of the stator core 31. In addition, the coating layer is easily peeled off, which can easily cause safety accidents.

[0057] The circumferential retaining ring structure of the insulating frame effectively and further strengthens the circumferential strength of the stator core 31, and the yoke width 313 can also be narrowed. By selecting a larger number of stator teeth, the performance of the motor can be made more stable and reliable, and vibration and noise during rotor rotation can be effectively prevented and reduced.

[0058] The insulating frame has an insertion portion 333 that is inserted between at least two adjacent full-tooth portions 315, and the insertion portion 333 has a winding relief groove 35 for allowing the stator winding to escape. That is, the insulating frame and the stator core 31 can be inserted and fixed, and therefore the insertion portion 333 can insulate and protect the position between two adjacent full-tooth portions 315, and the insertion portion 333 does not occupy any additional axial space of the stator core 31.

[0059] In some embodiments of the present invention, the insulating frame at least at one end has a frame retaining ring 331 protruding in the axial direction of the stator core 31 toward the side away from the core unit 311, and the frame retaining ring 331 can increase the structural strength of the insulating frame while isolating the stator core 31 from other structures in the motor to increase the electrical safety distance of the motor. As shown in Figures 3 to 4, the first insulating frame 33 includes, for example, a frame main body 332 and a frame retaining ring 331 connected to the frame main body 332 and protruding in the axial direction of the core unit 311 toward the side away from the core unit 311.

[0060] Hereinafter, a motor stator structure according to one embodiment of the present invention will be described.

[0061] The stator structure includes a plurality of core units 311, the ends of which are joined together along the circumferential direction of the motor to form an annular stator core 31, a first insulating frame 33, and a second insulating frame 34. Each core unit 311 includes a yoke portion 313, a first half-tooth portion 3121 provided at one end of the yoke portion 313, a second half-tooth portion 3122 provided at the other end of the yoke portion 313, and five full-tooth portions 315 located between the first half-tooth portion 3121 and the second half-tooth portion 3122. The first half-tooth portion 3121 is provided with a groove, and the second half-tooth portion 3122 is provided with a protrusion, both of which are configured in a dovetail shape. In the axial direction of the core unit 311, the axial height of the protrusion is equal to the axial height of the half-tooth portion 312, and the axial height of the groove is equal to the axial height of the half-tooth portion 312. When the circumferential width of the projection or recessed groove is C, the circumferential width of the full tooth portion 315 is D, the radial width of the yoke portion 313 is E, the radial width of the core unit 311 is F, the inner radius of the core unit 311 is R1, and the outer radius of the core unit 311 is R2, C=1 mm, D=5 mm, E=2.6 mm, F=6.4 mm, and R1 / R2=0.8. The first insulating frame 33 is fixed to one axial end of the stator core 31, and the second insulating frame 34 is fixed to the other axial end of the stator core 31. The first insulating frame 33 and the second insulating frame 34 each have an insertion portion 333 that is inserted between two adjacent full tooth portions 315, and the insertion portion 333 has a winding relief groove 35. The first insulating frame 33 includes a frame body 332 and a frame retaining ring 331 that is connected to the frame body 332 and protrudes along the axial direction of the core unit 311 toward a side away from the core unit 311 .

[0062] A motor according to an embodiment of the second aspect of the present invention includes the above-mentioned motor stator structure.

[0063] A fan according to an embodiment of the third aspect of the present invention includes a motor and a fan blade that is rotationally driven by the motor as described above.

[0064] In the present description, a description that refers to the terms "one embodiment," "several embodiments," "examples," "specific examples," or "several examples" means that the specific features, structures, materials, or characteristics described in connection with this embodiment or example are included in at least one embodiment or example of the present invention. In the present description, general expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, a person skilled in the art can combine and combine different embodiments or examples described herein.

[0065] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above-described embodiments are illustrative and not restrictive of the present invention. Those skilled in the art may change, modify, substitute, and alter the above-described embodiments within the scope of the present invention.

Claims

1. A stator structure for a motor, comprising: a plurality of individually formed core units whose ends are joined together along a circumferential direction of the motor to form an annular stator core; Each of the core units includes a half tooth portion and a yoke portion, the half-tooth portions are provided on both ends of the yoke portion, and each half-tooth portion is provided with a connection portion, and two adjacent half-tooth portions of two core units in the circumferential direction are connected by the respective connection portions, the half-tooth portion is located outside the yoke portion in a radial direction of the motor, a recessed groove is provided in one of the half-tooth portions of the core unit, and a protrusion is provided in the other half-tooth portion, and the recessed groove and the protrusion are configured as the connection portion, Each of the half teeth has a connection side adapted to connect with another adjacent half tooth, the groove is recessed from the connection side, and the protrusion protrudes from the connection side; the recessed groove and the protrusion are both entirely located outside the yoke portion in the radial direction, a stopper structure is provided on the radially inner side of the yoke portion, the core unit further includes a full tooth portion that is provided on the outer side of the yoke portion in the radial direction and is located between two of the half tooth portions at both ends in the circumferential direction, the connection portion and the stopper structure are provided so as to be offset from each other in the circumferential direction, the full tooth portion is disposed between the stopper structure and each of the two half tooth portions at both ends in the circumferential direction, The motor stator structure further includes a stator bush, a stopper structure for engaging with the stator bush when the stator core is fitted into the stator bush, thereby limiting sliding between the stator core and the stator bush in the circumferential direction.

2. 2. The stator structure for a motor according to claim 1, wherein two of the half-tooth portions form one full-tooth portion after being connected by the respective connecting portions.

3. 2. The motor stator structure according to claim 1, wherein a ratio of a radial width of said yoke portion to a circumferential width of said all teeth portion is 1 / 2 to 2 / 3.

4. 2. The motor stator structure according to claim 1, wherein a ratio of a circumferential width of said connection portion to a circumferential width of said total tooth portion is 0.15 to 0.

4.

5. 2. The motor stator structure according to claim 1, characterized in that, when a radial width of the core unit is F, a circumferential width of the entire tooth portion is D, and a radial width of the yoke portion is E, D, E, and F satisfy a relational expression E + 0.5D ≦ F ≦ E + D.

6. 2. The motor stator structure according to claim 1, wherein the core unit has an arc-shaped structure, and a ratio between an inner diameter of the core unit and an outer diameter of the core unit is 0.6 to 0.

95.

7. 2. The motor stator structure according to claim 1, further comprising an annular insulating frame fixed to both axial ends of the stator core, the insulating frame having an inset portion that is inset between at least two adjacent full tooth portions, the inset portion having a winding relief groove.

8. 8. The motor stator structure according to claim 7, wherein the insulating frame at least at one end has a frame retaining ring that protrudes in an axial direction of the stator core toward a side away from the core unit.

9. A motor comprising the motor stator structure according to any one of claims 1 to 8.

10. A fan comprising: the motor according to claim 9; and a fan blade that is rotationally driven by the motor.

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