Motor, ventilation device, and method for manufacturing motor

Abstract

A motor (1) is provided with: a stator (2) having a substantially cylindrical stator core (8); a rotor (3) having magnets (6) surrounding the stator core (8); a shaft (7) that passes through the substantially cylindrical central space and is fixed to the rotor (3); and a pair of bearings (22) that are inserted into the shaft (7) and hold the shaft (7) so as to be rotatable with respect to the stator (2), the stator core (8) being provided with a bearing locking part (17) that protrudes in the central space from the inner wall of the stator core (8) in the direction of the shaft (7) and locks the movement of the pair of bearings (22) in the axial direction of the substantially cylindrical shape. And a pair of bearings (22) provided in the center space (27) so as to prevent collision between one bearing (22a) and the other bearing (22b), in which the one bearing (22a) is provided on the opposite side of the other bearing (22b) with the bearing engagement section (17) interposed therebetween, and the pair of bearings (22) are positioned further toward the inside of the stator core (8) than the substantially cylindrical end sections in the axial direction in the center space (27), and the pair of bearings (22) are provided in the center space (27) so as to prevent collision between the one bearing (22a) and the other bearing (22b). Therefore, the desired purpose is achieved.

Description

Technical Field

[0001] The present invention relates to a motor, a ventilation device and a method for manufacturing the motor. Background Art

[0002] In the past, such motors were known to have Figure 9 The structure shown (see Patent Document 1) is shown. Specifically, a motor with a rotary fan mounted on an electronic device has support arms 103 formed at multiple locations along the circumference of one end of a cylindrical housing 101, supporting an outer rotor-type brushless motor 102 at the center of the housing 101. Brushless motor 102 comprises a bearing boss 104, a rotating shaft 106 supported at the center of bearing boss 104 via bearings 105a and 105b, a rotor 107 mounted on rotating shaft 106, a field core 108 mounted on the outer periphery of bearing boss 104, a field winding 109 applied to field core 108, a magnet 110 mounted on the inner side of rotor 107 opposite field core 108, and a drive control unit 111 built into the base end 104a of bearing boss 104. Bearings 105a and 105b are attached to a protrusion 104b that protrudes axially from base end 104a. An axial flow rotary fan 112 is attached to the outer diameter portion of the rotor 107 .

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: International Publication No. 03 / 015243 Summary of the Invention

[0006] Conventionally, the field core 108 is mounted on the outer circumference of the protrusion 104b, while the rotating shaft 106 is supported on the inner circumference of the protrusion 104b. In other words, the stator and rotor are engaged across the protrusion 104b. Consequently, the diameter of the field core 108 increases by the thickness of the protrusion 104b, increasing the radial dimensions of the brushless motor 102. Furthermore, because the bearings 105a and 105b are positioned outward of the axial ends of the field core 108 via the protrusion 104b, the axial dimensions of the brushless motor 102 also increase.

[0007] Furthermore, it is conceivable to modify the shape of the base end portion 104a depending on the product when the motor is mounted on various products. However, in conventional bearing bosses 104, the base end portion 104a and the protrusion 104b are integrally formed, making it difficult to modify only the shape of the base end portion 104a. This has the problem of limiting the degree of freedom in mounting the motor on a product.

[0008] Therefore, an object of the present invention is to provide a motor and a ventilation device using the same, which can engage the stator and rotor without using the protrusions in the conventional bearing bosses, thereby being more compact in the radial and axial directions and having a higher degree of freedom in product installation than before.

[0009] In addition, in order to achieve the above-mentioned purpose, the motor comprises: a stator, which has a stator core that is roughly cylindrical; a rotor, which has a magnet surrounding the stator core; a shaft, which passes through the roughly cylindrical center space and is fixed to the rotor; and a pair of bearings, which are inserted into the shaft and hold the shaft so that it can rotate freely relative to the stator. The stator core has a bearing locking portion, which protrudes from the inner wall of the stator core in the direction of the shaft in the center space to lock the movement of the pair of bearings in the roughly cylindrical axial direction to prevent the bearing of one of the pair of bearings from colliding with the bearing of the other. For the pair of bearings, one bearing is arranged on the opposite side of the other bearing across the bearing locking portion, and the pair of bearings are located in the center space at a position closer to the inner side of the stator core than the two ends in the roughly cylindrical axial direction, thereby achieving the desired purpose.

[0010] Furthermore, a ventilation device including the motor is also provided.

[0011] According to the present invention, it is possible to provide a motor that is smaller in radial and axial directions than conventional motors and has a higher degree of freedom in product installation, and a ventilation device using the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a cross-sectional view showing the internal structure of the motor according to the first embodiment of the present invention.

[0013] Figure 2 It is a plan view of the stator core according to the first embodiment of the present invention.

[0014] Figure 3A It is a cross-sectional view of the stator core according to the first embodiment of the present invention.

[0015] Figure 3B It shows the Figure 3A Schematic diagram of the positional relationship when the stator core is inserted into the bearing.

[0016] Figure 4A It is a bottom view of the insulating member according to the first embodiment of the present invention.

[0017] Figure 4B yes Figure 4A BB cross-sectional view.

[0018] Figure 5A It is a plan view of the stator base according to the first embodiment of the present invention.

[0019] Figure 5B yes Figure 5A CC cross-sectional view.

[0020] Figure 6A It is a plan view of the cap according to the first embodiment of the present invention.

[0021] Figure 6B yes Figure 6A DD cross-sectional view.

[0022] Figure 7A It is a schematic diagram showing the assembly procedure of the motor according to the first embodiment of the present invention.

[0023] Figure 7B It is a schematic diagram showing the assembly procedure of the motor according to the first embodiment of the present invention.

[0024] Figure 7C It is a schematic diagram showing the assembly procedure of the motor according to the first embodiment of the present invention.

[0025] Figure 7D It is a schematic diagram showing the assembly procedure of the motor according to the first embodiment of the present invention.

[0026] Figure 8A This is a schematic diagram showing the assembly procedure of a motor according to Embodiment 2 of the present invention.

[0027] Figure 8B This is a schematic diagram showing the assembly steps of a motor according to Embodiment 2 of the present invention.

[0028] Figure 8C This is a schematic diagram showing the assembly steps of a motor according to Embodiment 2 of the present invention.

[0029] Figure 8D This is a schematic diagram showing the assembly steps of a motor according to Embodiment 2 of the present invention.

[0030] Figure 9 This is a cross-sectional view showing the internal structure of a conventional motor. DETAILED DESCRIPTION

[0031] The following describes an embodiment of the present invention with reference to the accompanying drawings. It should be noted that the following embodiment is merely an example of a specific embodiment of the present invention and does not limit the technical scope of the present invention. In addition, identical parts are denoted by the same reference numerals throughout the drawings, and descriptions thereof are omitted. Furthermore, in each drawing, detailed descriptions of parts not directly related to the present invention are omitted.

[0032] (Implementation Method 1)

[0033] Reference Figure 1A motor according to Embodiment 1 of the present invention will be described. Figure 1 This is a cross-sectional view schematically illustrating the internal structure of the motor 1. Hereinafter, the direction parallel to the rotating shaft 24 of the motor 1 is referred to as the "axial direction," the direction perpendicular to the axial direction is referred to as the "radial direction," the direction radially away from the rotating shaft 24 is referred to as the "radially outer direction," and the direction opposite to the radially outer direction, that is, the direction perpendicularly from the radially outer direction toward the rotating shaft 24, is referred to as the "radially inner direction."

[0034] The motor 1 includes a stator 2 , a rotor 3 , a bearing 22 , an elastic body 23 , a stator base 4 , and a cap 5 .

[0035] The stator 2 is fixed to the stator base 4 to fix the position of the rotating shaft 24 of the motor 1. The stator 2 includes a stator core 8, an insulator 9, a coil 10, and a substrate 11.

[0036] The stator core 8 is formed into a substantially cylindrical shape by laminating a plurality of substantially disk-shaped steel plates in the axial direction. The stator core 8 includes a central space 27 and a bearing locking portion 17 .

[0037] The central space 27 is a space for passing the shaft 7 described later. The central space 27 is located on the inner circumference of the substantially cylindrical shape of the stator core 8. In other words, the central space 27 is a space inside the axial end surfaces of the stator core 8.

[0038] The bearing locking portion 17 is formed in an axially thin plate shape and is a protrusion that protrudes radially inward from the inner wall of the stator core 8 in the central space 27. The bearing locking portion 17 locks the bearing 22 to prevent its axial movement.

[0039] Insulators 9 are placed on both axial ends of the stator core 8. The coils 10 are wound with the insulators 9 interposed therebetween, and the insulators 9 serve to electrically insulate the stator core 8 from the coils 10.

[0040] The coil 10 is a conductive wire mainly made of a copper-aluminum alloy. The coil 10 is wound around the stator core 8 via an insulator 9. When energized, the coil 10 generates an electromagnetic force for rotating the rotor 3.

[0041] The motor 1 is controlled by electronic components mounted on the substrate 11. The ends of the coils 10 are connected to the substrate 11 via terminal pins or the like using solder.

[0042] The rotor 3 is rotatably fixed to the stator core 8 via a bearing 22. When the motor 1 is driven, the rotor 3 rotates around the rotating shaft 24. The rotor 3 includes a magnet 6 and a shaft 7.

[0043] Magnet 6 is a topped cylindrical shape with a hollow space inside. Magnet 6 encloses stator core 8 within this hollow space, annularly surrounding the outer circumference of stator core 8 with a uniform gap. In other words, magnet 6 surrounds stator core 8. Magnet 6 exerts magnetic force on stator core 8, which is fixed in the hollow space, and also serves as the outer contour of motor 1. A shaft through-hole 26 is provided on the top surface of magnet 6.

[0044] The shaft through-hole 26 is an opening for fixing the shaft 7 to the magnet 6, and has a circular shape having the same diameter as the outer diameter of the shaft 7. The rotating shaft 24 passes through the center of the shaft through-hole 26 perpendicular to the circular shape.

[0045] The shaft 7 is formed into a cylindrical shape. The shaft 7 is pressed into the shaft through-hole 26 and fixed to the magnet 6. The rotating shaft 24 passes through the center of the two end faces of the cylindrical shape of the shaft 7. In this embodiment, the shaft through-hole 26 is provided in the magnet 6 and the shaft 7 is pressed in and fixed, but the magnet 6 and the shaft 7 may also be formed integrally. It should be noted that as long as the rotating shaft 24 passes through the center of the two end faces of the cylindrical shape of the shaft 7 and the magnet 6 rotates together with the shaft 7, it can be fixed in any manner.

[0046] The bearing 22 holds the shaft 7 rotatably inside the stator 2. In other words, the bearing 22 rotatably fixes the rotor 3 to the stator core 8 via the shaft 7. The bearing 22 is a hollow cylindrical shape having an inner diameter equal to the outer diameter of the shaft 7 and an outer diameter equal to the inner diameter of the stator core 8. A pair of bearings 22 are provided, and one bearing 22a is provided on the opposite side of the other bearing 22b across the bearing locking portion 17. Figure 1 For convenience, the lower portion of the drawing is designated as bearing 22a on one side, and the upper portion is designated as bearing 22b on the other side, but the reverse is possible. Since the outer diameter of bearing 22 is equal to the inner diameter of stator core 8, it can be located inward of both axial ends of stator core 8. In other words, at least one end of each of the pair of bearings 22 is located inward of stator core 8 within central space 27. It should be noted that "located inward" refers to one end (surface) being located inward of stator core 8, not both the top and bottom surfaces of the cylindrical shapes of the pair of bearings 22 being located axially inward of stator core 8. Bearing 22 includes an inner ring 28 and an outer ring 29. Furthermore, multiple rolling elements are rollably held between the outer circumference of inner ring 28 and the inner circumference of outer ring 29.

[0047] The inner ring 28 is cylindrical and has an inner diameter equal to the outer diameter of the shaft 7 , and is inserted into the shaft 7 . The inner ring 28 rotates together with the shaft 7 .

[0048] The outer ring 29 is cylindrical and has an inner diameter equivalent to that of the stator core 8, and is disposed on the outer periphery of the inner ring 28. The outer ring 29 is rotatably held inside the stator core 8.

[0049] The elastic body 23 is provided on at least one surface of the bearing locking portion 17 in the axial direction. By applying a load to the outer ring 29 of the other bearing 22b, the elastic body 23 axially biases the outer ring 29 toward the outside of the stator core 8, compared to the inner ring 28. This axially offsets the positions of the outer ring 29 and inner ring 28, allowing the rolling elements to roll stably. This suppresses noise and vibration, ensuring proper function of the bearing 22. Furthermore, the reaction force of the other bearing 22a via the bearing locking portion 17 also biases the outer ring 29 toward the outside of the stator core 8, compared to the inner ring 28. As a result, in the same manner as in the other bearing 22b, the outer ring 29 and inner ring 28 of the other bearing 22a are axially offset, enabling stable rolling of the rolling elements.

[0050] The stator base 4 is fixed to a product (such as a ventilation device) equipped with the motor 1. The stator base 4 engages with the insulator 9, securing the stator 2 via the insulator 9. The stator base 4 may also be integrally formed with the product equipped with the motor 1. Details of the engagement between the stator base 4 and the insulator 9 will be described later. The stator base 4 includes a clamp insertion hole 30.

[0051] The jig insertion hole 30 is a circular hole for inserting a support jig for inserting the bearing 22 into the shaft 7 into the inner side of the stator 2 and is provided at the center of the stator base 4. The detailed procedure for inserting the bearing 22 into the shaft 7 will be described later.

[0052] The cap 5 has an outer diameter equal to the inner diameter of the jig insertion hole 30. After the bearing 22 is inserted into the shaft 7 through the jig insertion hole 30, the cap 5 prevents foreign matter such as dust from entering the interior of the stator 2. The cap 5 passes through the jig insertion hole 30 and is locked to the stator base 4. In other words, the cap 5 fits into the jig insertion hole 30.

[0053] The motor 1 having such a structure rotates the rotor 3 via a pair of bearings 22 based on electromagnetic force induced by energizing the coil 10 under control of the substrate 11 .

[0054] Next, refer to Figure 2 、 Figure 3A as well as Figure 3B The stator core 8 and the bearing 22 will be described in detail. Figure 2 : is a top view showing the structure of the stator core 8. Figure 3A yes Figure 2 AA cross-sectional view. Figure 3B It shows the Figure 3A Schematic diagram of the positional relationship when the stator core is inserted into the bearing.

[0055] The stator core 8 includes a cylindrical portion 12 and teeth 15 .

[0056] The cylindrical portion 12 is a portion forming the inner circumference of the substantially cylindrical shape of the stator core 8 .

[0057] The tooth portion 15 is a protrusion for winding the coil 10 around the stator core 8. The tooth portion 15 protrudes radially outward from the cylindrical portion 12. In this embodiment, the tooth portion 15 is provided every 90 degrees with respect to the rotating shaft 24. In other words, a total of four teeth 15 are provided at equal intervals along the circumference of the cylindrical portion 12. It should be noted that the number of teeth 15 can be freely changed according to the specifications of the motor 1. The tooth portion 15 includes a winding portion 13, a curved portion 14, and an adjacent portion 16.

[0058] The winding portion 13 connects the cylindrical portion 12 and the curved portion 14. Figure 1 The insulating member 9 shown in FIG. 1 is wound with a coil 10 .

[0059] The curved surface portion 14 is a locking portion that prevents the coil 10 wound on the winding portion 13 from moving radially outward. The curved surface portion 14 is arranged to extend from the radially outer end of the winding portion 13 to both sides of the rotating shaft 24 by the same length in the circumferential direction. The curved surface portion 14 is formed so that the thickness in the radial direction gradually decreases toward the protruding tip that protrudes in the circumferential direction.

[0060] Adjacent portion 16 is a space provided between the protruding tips of curved surface portions 14 protruding from adjacent winding portions 13. In other words, due to the presence of adjacent portion 16, the protruding tips of curved surface portions 14 do not contact each other. Adjacent portion 16 is provided so that coil 10 can be inserted radially inward of curved surface portions 14 when winding coil 10 around winding portion 13.

[0061] The cylindrical portion 12 and the teeth portion 15 are formed of a first steel plate 25 a and a second steel plate 25 b .

[0062] The first steel plate 25a is formed into a hollow disk shape, and multiple first steel plates 25a are stacked in the axial direction to form the generally cylindrical shape of the stator core 8. In other words, the inner peripheral surface of the stacked first steel plates 25a serves as the inner wall, forming a central space 27 inside the stator core 8. The first steel plate 25a has an inner diameter that is equivalent to the outer diameter of the bearing 22.

[0063] The second steel plate 25b is formed into a roughly disc-like shape with an inner diameter smaller than that of the first steel plate 25a. In other words, it has an inner diameter smaller than the outer diameter of the bearing 22 (the outer diameter of the outer ring 29). Furthermore, the inner diameter of the second steel plate 25b is larger than the outer diameter of the inner ring 28. Since the inner diameter of the second steel plate 25b is smaller than that of the first steel plate 25a, a bearing retaining portion 17 is formed that protrudes radially inward within the central space 27 and abuts against the outer ring 29. It should be noted that, as Figure 3BAs shown, an elastic member 23 is provided on at least one surface of the second steel plate 25b. Therefore, while the outer ring 29 of the other bearing 22b is not strictly in direct contact with the bearing retaining portion 17, for ease of understanding, the contact through the elastic member 23 is also represented as abutment. The second steel plate 25b is provided with at least one sheet to form the bearing retaining portion 17. Furthermore, because the inner diameter of the second steel plate 25b is larger than the outer diameter of the inner ring 28, the second steel plate 25b forms a contact-preventing space 19 between the shaft 7 and the bearing retaining portion 17. This contact-preventing space 19 prevents friction between the inner ring 28 and the bearing retaining portion 17 when the inner ring 28 rotates with the shaft 7.

[0064] The second steel plate 25b is arranged so as to be sandwiched between the stacked first steel plates 25a. With this arrangement, concave portions 18 are formed at both axial ends of the stator core 8 for positioning at least one end of each of the pair of bearings 22 inside the stator core 8 in the central space 27. Figure 3A In the embodiment, the two concave portions 18 are located at both axial ends of the stator core 8 via the second steel plate 25b. In addition, the second steel plate 25b is preferably arranged at the center of the stator core 8 in the axial direction. With such an arrangement, the concave portions 18 are formed with equal sizes at both axial ends of the stator core 8. Therefore, at least one end of each of the pair of bearings 22 can be located at a position closer to the inside than the axial end of the stator core 8, so that both sides of the pair of bearings 22 can be reliably held on the inner side of the stator core 8. It should be noted that it is also possible to consider arranging an elastomer 23 on one surface of the bearing retaining portion 17, and arranging the second steel plate 25b in such a way that the depth of the concave portion 18 on one side is deeper than the concave portion 18 on the other side.

[0065] Conventionally, bearings were secured using protrusions integrally formed with the stator base, making it difficult to reduce the size of the motor in the axial direction. However, with the above-described structure, the bearing locking portion 17 protruding from the inner wall of the stator core 8 prevents collision between one bearing 22a and the other bearing 22b. In this case, the recessed portion 18 allows at least one end of each of the pair of bearings 22 to be positioned inward of the axial end of the stator core 8, thereby reducing the size of the motor 1 in the axial direction compared to conventional designs.

[0066] In addition, Figure 3A as well as Figure 3BIn the specification, a state in which only one second steel plate 25b is clamped is disclosed, but considering the strength of the bearing retaining portion 17, the first steel plate 25a adjacent to the second steel plate 25b may be replaced with the second steel plate 25b so that the bearing retaining portion 17 has thickness. In other words, within the range that does not affect the axial miniaturization of the motor 1, two or more second steel plates 25b may be clamped between the first steel plates 25a. Here, the upper limit of the axial miniaturization of the stator 2 is set to the height of the coil 10 wound on the stator core 8 from the winding portion 13. When assembling the motor 1, the thickness of the bearing retaining portion 17 can be freely changed within the range in which the position of each axial end of a pair of bearings 22 is less than the height h of the wound coil 10 from the winding portion 13 (for the height h, refer to Figure 4B ).

[0067] Next, refer to Figure 4A as well as Figure 4B The insulating member 9 will be described in detail. Figure 4A It is from Figure 1 The illustrated stator base 4 is a bottom view of the insulator 9 placed on the stator core 8 . Figure 4B yes Figure 4A BB cross-sectional view.

[0068] In the following, the insulating member placed on the stator base 4 side is referred to as the first insulating member 9a, and the insulating member placed on the opposite side of the first insulating member 9a is referred to as the second insulating member 9b. The first insulating member 9a will be primarily described. Furthermore, in the pair of bearings 22, the bearing 22 placed on the first insulating member 9a side is referred to as one bearing 22a, and the bearing 22 placed on the second insulating member 9b side is referred to as the other bearing 22b.

[0069] The first insulating material 9 a includes an insulating material base portion 31 , a substrate placement portion 32 , and an insulating material support portion 33 .

[0070] The insulator base 31 is formed in an annular shape having a flat surface perpendicular to the axial direction. The insulator base 31 is provided so as to abut against the axial end surface of the stator core 8 and to cover the cylindrical portion 12 and the teeth 15 .

[0071] The substrate mounting portion 32 is a protrusion for arranging the substrate 11 between the coil 10 and the stator base 4. The substrate mounting portion 32 protrudes from the insulating member base 31 to a position that is greater than the height h of the coil 10 from the winding portion 13. The substrate mounting portion 32 is provided at two locations, the inner circumference and the outer circumference of the annular ring-shaped insulating member base 31. Specifically, the substrate 11 is arranged at a predetermined position using a substrate mounting portion 32a provided at a position closer to the inner circumference than the coil 10 and a substrate mounting portion 32b provided at a position closer to the outer circumference than the coil 10. It should be noted that the substrate mounting portion 32a and the substrate mounting portion 32b preferably protrude from the insulating member base 31 with the same length so that the substrate 11 can be stably arranged.

[0072] The insulator support portion 33 is provided to engage the first insulator 9a with the stator base 4 and secure the stator core 8 to the stator base 4 via the first insulator 9a. The insulator support portion 33 is formed into a cylindrical shape that protrudes axially from the insulator base 31, centered on the rotating shaft 24. The insulator support portion 33 has an outer diameter equal to that of the cylindrical portion 12 of the stator core 8, and an inner diameter equal to that of the cylindrical portion 12. In other words, the insulator support portion 33 is formed into a cylindrical shape with the same thickness as the cylindrical portion 12. The insulator support portion 33 is located radially inward of the substrate mounting portion 32a and protrudes axially outward from the substrate mounting portion 32a. In other words, the insulator support portion 33 is provided on the first insulator 9a at a position closest to the rotating shaft 24 and protrudes to a position higher than the substrate mounting portion 32a, protruding to a position greater than the height h of the coil 10 from the winding portion 13. Here, the center of gravity of the stator 2 is located on the rotating shaft 24 due to the generally cylindrical shape of the stator core 8. With this structure, the insulator support portion 33 can engage with the stator base 4 at the position of the first insulator 9a closest to the center of gravity of the stator 2, thereby stably securing the stator 2. Furthermore, when the coil 10 is wound radially outward using a winding machine, the insulator support portion 33 does not obstruct the winding. The insulator support portion 33 includes an insulator retaining portion 34.

[0073] The insulating member retaining portion 34 is a rectangular opening provided on the inner wall of the insulating member support portion 33 in order to engage the insulating member 9 with the stator base 4. The insulating member retaining portion 34 is provided at a position axially inward of the protruding front end of the insulating member support portion 33. A plurality of insulating member retaining portions 34 are provided at equal intervals along the cylindrical shape of the insulating member support portion 33. Specifically, the insulating member retaining portions 34 are provided in a number corresponding to the stator base retaining portions 35 described later. From the viewpoint of stable engagement with the stator base retaining portions 35, the insulating member retaining portions 34 are preferably provided in three or more locations. In this embodiment, a total of four locations are provided every 90 degrees with respect to the rotating shaft 24.

[0074] Next, refer to Figure 5A as well as Figure 5B The stator base 4 will be described in detail. Figure 5A This is a plan view of the stator base 4 as viewed from the first insulating material 9 a side. Figure 5B yes Figure 5A CC cross-sectional view.

[0075] The stator base 4 includes a stator base locking portion 35 , a stator base locked portion 36 , and a base wall portion 37 .

[0076] The stator base locking portion 35 and Figure 4A as well as Figure 4B The illustrated insulator engaging portion 34 engages with the insulator support portion 33, securing it to the stator base 4. Multiple stator base engaging portions 35 are provided at equal intervals along the outer circumference of the fixture insertion hole 30. The number of stator base engaging portions 35 corresponds to the number of insulator engaging portions 34. In this embodiment, four stator base engaging portions 35 are provided at 90-degree intervals relative to the rotation axis 24. The stator base engaging portions 35 include a base arm portion 38, a base claw portion 39, a base inclined surface 41, and a stopper portion 40.

[0077] The base arm portion 38 is a protrusion that protrudes from the stator base 4 toward the first insulator 9a. The base arm portion 38 is located at the side of the stator base 4 when the stator base 4 and the first insulator 9a are engaged. Figure 4A as well as Figure 4B The inner peripheral side of the cylindrical insulator support portion 33 is shown.

[0078] The base claw portion 39 is a protrusion that protrudes radially outward from the base arm portion 38. The protruding tip of the base claw portion 39 enters the insulator locked portion 34 provided on the insulator support portion 33, thereby engaging the stator base 4 with the first insulator 9a.

[0079] The base inclined surface 41 is a radially outwardly inclined surface that connects the protruding tip of the base claw portion 39 with the protruding tip of the base arm portion 38. When the base arm portion 38 is inserted into the inner side of the insulator support portion 33, the base inclined surface 41 abuts against the protruding tip of the insulator support portion 33. In this state, the base arm portion 38 is further pressed into the inner side of the insulator support portion 33, causing the base arm portion 38 to flex radially inward along the base inclined surface 41. This structure allows for smooth engagement of the insulator engaged portion 34 with the stator base engaging portion 35.

[0080] The stopper 40 is a stopper that prevents the cap 5 from falling toward the first insulator 9a when the cap 5 is mounted in the jig insertion hole 30. The stopper 40 protrudes radially inward from the protruding tip of the base arm 38.

[0081] The stator base latching portion 36 is a protrusion positioned lower than the base arm portion 38. Multiple stator base latching portions 36 are provided at equal intervals along the outer circumference of the jig insertion hole 30. These stator base latching portions 36 are circumferentially positioned between the stator base latching portions 35. The number of stator base latching portions 36 provided corresponds to the number of cap latching portions 44 described below. In this embodiment, four stator base latching portions 36 are provided at 90-degree intervals relative to the rotation axis 24.

[0082] The base wall portion 37 is formed in a cylindrical shape around the rotating shaft 24, on the outer circumference of the stator base locking portion 35. The base wall portion 37 is positioned above the stator base locked portion 36 and below the stator base locking portion 35. The base wall portion 37 has an inner diameter equal to the outer diameter of the insulator support portion 33. Therefore, a space, or clamping space 42, having a thickness equal to that of the insulator support portion 33, is formed between the base wall portion 37 and the base arm portion 38.

[0083] With such a structure, the protruding tip of the insulator support portion 33 entering the holding space 42 can be clamped between the base arm portion 38 and the base wall portion 37 to securely engage the insulator support portion 33 .

[0084] Next, refer to Figure 6A as well as Figure 6B The cap 5 will be described in detail. Figure 6A This is a plan view of the cap 5 as viewed from the first insulating member 9a side. Figure 6B yes Figure 6A DD cross-sectional view.

[0085] The cap 5 includes a cover portion 43 , a cap locking portion 44 , a biasing portion 45 , and a reinforcing portion 46 .

[0086] The cover 43 is provided in a disk shape to cover at least the entire surface of the jig insertion hole 30. The cover 43 has an outer diameter equal to the inner diameter of the jig insertion hole 30 and contacts the stator base 4 to close the jig insertion hole 30.

[0087] The cap locking portions 44 engage with the stator base locked portions 36 to lock the cap 5 to the stator base 4. Multiple cap locking portions 44 are provided at equal intervals along the outer circumference of the cover portion 43. The number of cap locking portions 44 corresponds to the number of stator base locked portions 36. In this embodiment, four cap locking portions 44 are provided at 90-degree intervals relative to the rotation axis 24. The cap locking portions 44 include cap arms 47, cap claws 48, and cap inclined surfaces 49.

[0088] The cap arm portion 47 is a protrusion that protrudes from the cover portion 43 toward the first insulator 9a. When the cap 5 is engaged with the stator base 4, the cap arm portion 47 is located radially inward of the stator base engaged portion 36.

[0089] The cap claw portion 48 is a protrusion that protrudes radially outward from the cap arm portion 47. The protruding tip of the cap claw portion 48 enters the stator base locked portion 36 provided on the stator base 4, thereby engaging the cap 5 with the stator base 4.

[0090] The cap inclined surface 49 is a radially outwardly inclined surface that connects the protruding tip of the cap claw portion 48 with the protruding tip of the cap arm portion 47. When the cap arm portion 47 is inserted into the jig insertion hole 30, the cap inclined surface 49 abuts against the outer periphery of the jig insertion hole 30. In this state, the cap arm portion 47 is further pressed toward the inside of the jig insertion hole 30, causing the cap arm portion 47 to flex radially inward along the cap inclined surface 49. This structure allows for smooth engagement of the cap locking portion 44 with the stator base locked portion 36.

[0091] The force-applying portion 45 applies force to the base arm portion 38 from the radial inside to the radial outside, so that the engagement between the insulating member's locking portion 34 and the stator base locking portion 35 is firm. In other words, the force-applying portion 45 supports the base arm portion 38 in a manner that prevents it from moving radially inward. The force-applying portion 45 is a protrusion provided at the same height as the cap arm portion 47. When the cap 5 is engaged with the stator base 4, the force-applying portion 45 abuts against the radially inner surface of the base arm portion 38. A plurality of force-applying portions 45 are provided at equal intervals along the outer circumference of the cover portion 43. The force-applying portions 45 are located between each other in the circumferential direction of the cap locking portions 44. The number of force-applying portions 45 provided corresponds to the number of base arm portions 38. In this embodiment, a total of four force-applying portions 45 are provided every 90 degrees with respect to the rotating shaft 24.

[0092] The reinforcement portion 46 is a rib that prevents the force-applying portion 45 from bending radially inward. The reinforcement portion 46 is formed into a right-angled triangle with a thickness. One side of the reinforcement portion 46, forming a right angle, abuts the cover portion 43, and the other side abuts the radially inner surface of the force-applying portion 45. This shape allows the force-applying portion 45 to stably apply force to the base arm portion 38, thereby ensuring a secure engagement between the cap engaging portion 44 and the stator base engaged portion 36.

[0093] Next, refer to 7A to 7D The assembly steps of the stator 2 and the motor 1 will be described in detail. 7A to 7D It is a schematic diagram showing the assembly steps of the motor 1.

[0094] First, refer to Figure 7A as well as Figure 7B The assembly steps of the stator 2 are described below. Figure 1 The components of the motor 1 are turned upside down based on the state of .

[0095] First, the insulator 9 is placed on both ends of the stator core 8 in the axial direction, and the coil 10 is wound around the stator core 8 through the insulator 9 ( Figure 7A ).

[0096] Next, the substrate 11 is placed on the substrate placement portion 32a and the substrate placement portion 32b along the outer wall of the insulator support portion 33 ( Figure 7A ).

[0097] Next, one of the bearings 22a is inserted into the stator core 8 along the inner wall of the insulator support portion 33 ( Figure 7A The outer ring 29 of the bearing 22a is inserted until it contacts the bearing stopper 17, so that at least one end of the bearing 22a is located in the center space 27 ( Figure 7B ).

[0098] Next, the stator base locking portion 35 is engaged with the insulator locked portion 34 to fix the stator core 8 to the stator base 4 via the first insulator 9a ( Figure 7B ). Specifically, the stator base 4 is pressed from the axial outside toward the axial inside while the base inclined surface 41 is in contact with the protruding front end of the insulator support portion 33. By pressing, the base arm portion 38 is bent radially inward, so that the stator base locking portion 35 can slide toward the inner wall of the insulator support portion 33 for insertion. At this time, by sliding the inner wall of the base wall portion 37 and the outer wall of the insulator support portion 33 for engagement, the protruding front end of the insulator support portion 33 can be smoothly inserted into the clamping space 42. In addition, by clamping the substrate 11 using the substrate mounting portion 32a and the base wall portion 37, even when stress is applied to the substrate 11, for example, when a connector is installed on the substrate 11, direct stress on the substrate 11, especially the solder portion to which the end of the coil 10 is connected, can be alleviated. Through such steps, the stator core 8 can be fixed to the stator base 4.

[0099] Next, refer to Figure 7C as well as Figure 7D The assembly procedure of the motor 1 will be described.

[0100] First, the shaft 7 is pressed into and fixed to the shaft through hole 26 provided in the magnet 6. Then, the other bearing 22b of the pair is pressed into and fixed to the shaft 7. The other bearing 22b is arranged inside the top cylindrical shape of the magnet 6 by being pressed into ( Figure 7C ).

[0101] Next, from Figure 7B The stator 2 is turned upside down in the state. At this time, the protruding front end of the stator base locking portion 35 contacts the outer ring 29, thereby inhibiting the axial outward movement of the bearing 22. In other words, the bearing 22 is prevented from emerging outward from the central space 27 due to gravity ( Figure 7C ).

[0102] Next, the elastic body 23 is inserted from the second insulating member 9b side and placed on the bearing locking portion 17 ( Figure 7C ).

[0103] After loading, the shaft 7 is inserted into the center space 27 and pressed into and fixed to one of the pair of bearings 22a fixed between the bearing retaining portion 17 and the stator base retaining portion 35. At this time, the bearing 22a on one side may be damaged by the load caused by the press-in. Therefore, in order to support the press-in load, the support fixture 50 is inserted from the fixture insertion hole 30. The front end of the support fixture 50 is brought into contact with the inner ring 28 of the bearing 22 to provide support, thereby reducing the load caused by the press-in. The shaft 7 is inserted until at least one end of the other bearing 22b pressed and fixed to the shaft 7 is located in the center space 27 ( Figure 7C ).

[0104] When press-fitting the shaft 7, the press-fitting equipment performs stroke management and other adjustments, allowing the other bearing 22b to be pressed against the elastic body 23, compressing the elastic body 23. Compressing the elastic body 23 applies a stable preload to the outer ring 29 of the other bearing 22b. This axially offsets the position of the outer ring 29 and the inner ring 28, allowing the rolling elements to roll stably, thereby suppressing noise and vibration and ensuring the proper function of the bearing 22. Furthermore, due to the pressure of the elastic body 23, the pair of bearings 22, along with the shaft 7, are subjected to forces moving away from the stator base 4. Before the shaft 7 is press-fitted, the protruding tip of the stator base retaining portion 35 of one bearing 22a abuts due to gravity. However, after the shaft 7 is press-fitted, the pressure of the elastic body 23 separates the two bearings 22a from each other.

[0105] Next, the cap locking portion 44 is engaged with the stator base locked portion 36 to fix the cap 5 to the stator base 4 ( Figure 7D ). Specifically, the cap 5 is pressed from the axial outside toward the axial inside in a state where the base inclined surface 41 is in contact with the outer periphery of the clamp insertion hole 30. By pressing, the cap arm portion 47 is bent toward the radial inside, so that the cap locking portion 44 can slide toward the inner wall of the stator base 4 to be inserted into the clamp insertion hole 30. The cap 5 is inserted until the protruding front end of the force-applying portion 45 is in contact with the stop portion 40. By the force-applying portion 45 provided on the cap 5, the stator base locking portion 35 is forced radially outward, and the stator base locking portion 35 and the base wall portion 37 can be used to firmly clamp the insulating member support portion 33. It should be noted that the bearing 22a on one side can be visually observed from the clamp insertion hole 30. Therefore, before assembling the cap 5, it is possible to confirm by visual observation whether the shaft 7 and the bearing 22a on one side are correctly pressed in.

[0106] In the past, Figure 9In this way, bearings 105a and 105b are installed across protrusion 104b, and the stator and rotor are engaged. Specifically, field core 108 is mounted on the outer circumference of protrusion 104b, and rotating shaft 106 is supported on the inner circumference of protrusion 104b. With this shape, the motor has the problem of increasing the amount of protrusion 104b in the axial and radial directions.

[0107] In contrast, by providing the stator core 8 with the bearing locking portion 17 protruding toward the center space 27, at least one end of each of the pair of bearings 22 can be positioned within the center space 27. Furthermore, the insulator 9 can be engaged with the stator base 4 using the insulator locked portion 34 and the stator base locking portion 35.

[0108] This structure can reduce the size of the motor 1 in the axial direction compared to the conventional motor 1. In addition, since the stator 2 and the rotor 3 can be engaged without passing through the conventional protrusion 104b, the motor 1 can also be reduced in size in the radial direction compared to the conventional motor 1.

[0109] Furthermore, since the stator core 8 and the stator base 4 can be engaged without passing through the conventional protrusion 104 b , the shape of the stator base 4 can be easily changed, thereby increasing the degree of freedom in product mounting.

[0110] (Implementation Method 2)

[0111] Next, an assembling method of the motor 1 that is different from that of the first embodiment will be described with reference to FIG. 8 . Figures 8A to 8D This is a schematic diagram showing the assembly steps of the motor 1, but is different from the previous one in that the pair of bearings 22 are pressed into the stator core 8 instead of the shaft 7. 7A to 7D It should be noted that the description of the parts assembled in the same steps as those in the first embodiment will be omitted as appropriate.

[0112] First, refer to Figure 8A as well as Figure 8B The assembly steps of the stator 2 are described below. Figure 1 The components of the motor 1 are turned upside down based on the state of .

[0113] First, the coil 10 is wound around the stator core 8 via the insulating member 9, and the substrate 11 is placed on the substrate mounting portion 32a and the substrate mounting portion 32b ( Figure 8A ).

[0114] Next, one of the bearings 22a is pressed into the inner side of the stator core 8 along the inner wall of the insulator support portion 33 and fixed ( Figure 8A The outer ring 29 of the bearing 22a is inserted until it contacts the bearing stopper 17, so that at least one end of the bearing 22a is located in the center space 27 ( Figure 8B ). In addition, the other bearing 22b is pressed into the inner side of the stator core 8 from the second insulating member 9b side and fixed ( Figure 8A By pressing in, the other bearing 22b becomes located on the opposite side of the one bearing 22a with the bearing locking portion 17 interposed therebetween ( Figure 8B It should be noted that, unlike the first embodiment, the elastic body 23 may not be placed on the bearing locking portion 17 .

[0115] Next, the stator base locking portion 35 is engaged with the insulator locked portion 34 to fix the stator core 8 to the stator base 4 via the first insulator 9a ( Figure 8B ).

[0116] Next, refer to Figure 8C as well as Figure 8D The assembly procedure of the motor 1 will be described.

[0117] First, from Figure 8B The state makes stator 2 turn upside down ( Figure 8C ).

[0118] Next, the elastic body 23 is inserted from the second insulating member 9b side and placed on the inner ring 28 of the other bearing 22b ( Figure 8C ).

[0119] Next, the shaft 7 is inserted into the central space 27 and passed through the bearing 22a on one side and the bearing 22b on the other side ( Figure 8C ). In this case, unlike the first embodiment, the shaft 7 is not press-fitted into the pair of bearings 22, so another method is required to fix the shaft 7 and the pair of bearings 22.

[0120] Therefore, in the second embodiment, the shaft 7 and the pair of bearings 22 ( Figure 8C ). The snap ring 51 is an annular member having an inner diameter equal to the outer diameter of the shaft 7 and smaller than the outer diameter of the fixture insertion hole 30. The snap ring 51 is placed on the front end of the support fixture 50 and inserted from the fixture insertion hole 30 together with the support fixture 50. The snap ring 51 is pressed and fixed to the front end of the shaft 7 inserted from the second insulating member 9b side while being supported by the inner ring of one bearing 22a. Figure 8C The snap ring 51 contacts the inner ring of one bearing 22 a to suppress movement of the shaft 7 in the axial direction.

[0121] In addition, the magnet 6 is provided with a pressing portion 52 that protrudes in a cylindrical shape along the outer periphery of the shaft through-hole 26. The pressing portion 52 protrudes into the hollow space of the top cylindrical shape of the magnet 6. The pressing portion 52 has an inner diameter equal to the outer diameter of the shaft 7 and an outer diameter equal to the outer diameter of the inner ring 28. When the shaft 7 is pressed in, the stroke management and other adjustments are made using the pressing device, so that the elastic body 23 can be pressed against the inner ring 28 of the other bearing 22b by the pressing portion 52 to compress it ( Figure 8C By compressing the elastic body 23, a stable preload can be applied to the inner ring 28 of the other bearing 22b, thereby offsetting the position of the inner ring 28 and the outer ring 29. Furthermore, the pressure of the elastic body 23 and the snap ring 51 can stably secure the shaft 7 to the pair of bearings 22.

[0122] Next, the cap locking portion 44 is engaged with the stator base locked portion 36 to fix the cap 5 to the stator base 4 ( Figure 8D ).

[0123] As described above, even when the pair of bearings 22 are press-fitted into the stator core 8, by providing the stator core 8 with the bearing locking portion 17 that protrudes toward the central space 27, at least one end of each of the pair of bearings 22 can be positioned within the central space 27. Furthermore, the insulator 9 can be engaged with the stator base 4 using the insulator locked portion 34 and the stator base locking portion 35.

[0124] In the present invention, the insulator support portion 33 of the insulator 9 is cylindrical, but the shape is not limited and may be, for example, a square tube. In this case, the stator base locking portion 35 is also arranged along the square tube, and the base wall portion 37 is also provided in the square tube.

[0125] In the present invention, an insulating member engaging portion 34 serving as an opening is provided on the insulating member 9, and a stator base engaging portion 35 serving as a protrusion is provided on the stator base 4, but the present invention is not intended to be limited to the above-mentioned shapes. For example, a engaging portion protruding radially outward from the insulating member 9 may be provided, and a engaging portion may be provided on the stator base 4. In addition, a engaging portion protruding radially inward from the base wall portion 37 may be provided, and a engaging portion may be provided on the outer wall of the insulating member support portion 33 for engagement. As for the engaging method, it is also possible that instead of a hook like a claw, a detachable structure such as a press-fit engagement of a protrusion and a hole, welding after engagement of the protrusion and the hole, or a spiral groove and screwing is provided is used. There is no limitation on the fixing method. In any case, as long as the stator base 4 can be engaged with the stator core 8 via the insulating member 9, any shape may be used. The same applies to the engaging of the stator base 4 and the cap 5.

[0126] The substrate 11 is placed on the substrate placement portion 32 and is fixed by being clamped between the substrate placement portion 32a and the base wall portion 37. However, for higher-quality fixation, it may be clamped at multiple locations. For example, a protrusion may be provided that protrudes from a position closer to the outer periphery of the base wall portion 37 toward the substrate 11 and, together with the substrate placement portion 32b, clamps the substrate 11.

[0127] (Summary of the Invention)

[0128] The motor according to the present invention comprises: a stator having a stator core that is roughly cylindrical; a rotor having a magnet surrounding the stator core; a shaft that passes through a center space of the roughly cylindrical shape and is fixed to the rotor; and a pair of bearings that are inserted into the shaft and hold the shaft so as to rotate freely relative to the stator, the stator core having a bearing locking portion, the bearing locking portion protruding from the inner wall of the stator core in the direction of the shaft in the center space to lock the pair of bearings in the axial direction of the roughly cylindrical shape to prevent the bearing of one of the pair of bearings from colliding with the bearing of the other, with respect to the pair of bearings, the bearing of one of the pair of bearings is arranged on the opposite side of the bearing of the other across the bearing locking portion, and the pair of bearings are located in the center space at a position closer to the inner side of the stator core than the two end portions in the axial direction of the roughly cylindrical shape.

[0129] According to such a structure, the stator and the rotor can be fixed without using bosses used in the conventional technology, so the stator core 8 can be miniaturized, and the motor 1 can be miniaturized.

[0130] Furthermore, the pair of bearings may be configured such that at least one end of each of the pair of bearings is located inside the stator core in the central space.

[0131] This structure allows the motor 1 to be miniaturized in the axial direction. If the coil 10 is the upper limit of miniaturization in the axial direction, forming both ends of the pair of bearings 22 to be equal to the ends of the coil 10 can contribute to miniaturization in the axial direction.

[0132] In addition, the stator core may be configured to be in the substantially cylindrical shape by stacking a plurality of substantially disc-shaped steel plates along the axial direction, and the stator core may constitute the bearing retaining portion by making the inner circumference of at least one of the plurality of steel plates smaller than the outer circumference of the pair of bearings.

[0133] The rigidity of the steel plate is higher than that of the powder core material. Therefore, according to this structure, the rigidity of the concave portion 18 holding the bearing 22 is high, thereby improving the strength and shaft accuracy of the motor 1.

[0134] In addition, it can also be constructed so that the pair of bearings include an inner ring inserted into the shaft, an outer ring arranged on the outer periphery of the inner ring, and a plurality of rolling elements held between the outer periphery of the inner ring and the inner periphery of the outer ring in a rolling manner, and the bearing locking portion includes an elastomer, and for at least one of the bearings, the elastomer applies a force to the outer ring toward the outside of the axial direction more than the inner ring.

[0135] With this structure, the elastic body 23 urges the outer ring 29 of the bearing 22 axially outward relative to the inner ring 28. The preload provided by the elastic body 23 enables the bearing 22 to function appropriately.

[0136] Furthermore, the stator core may include a contact prevention space between the shaft and a protruding tip of the bearing locking portion for preventing contact between the inner ring and the bearing locking portion.

[0137] According to such a configuration, when the motor is driven, the inner ring 28 of the bearing 22 does not rub against the bearing locking portion 17 , so the motor 1 can be driven smoothly.

[0138] Alternatively, the motor of the present invention may include: a stator having a stator core that is approximately cylindrical; a rotor having a magnet surrounding the stator core; a shaft that passes through the approximately cylindrical center space and is fixed to the rotor; a winding that is wound around the stator core; an insulating member that insulates the stator core from the winding; and a stator base that is arranged opposite to one axial end of the approximately cylindrical shape and fixes the stator via the insulating member.

[0139] According to such a configuration, the stator core 8 can be engaged with the stator base 4 without passing through the conventional protrusion 104 b , so the shape of the stator base 4 can be easily changed, thereby improving the degree of freedom in product loading.

[0140] Alternatively, the stator base may be detachably held on the stator via an insulating member.

[0141] According to such a structure, the stator 2 can be easily removed from the stator base 4 fixed to the product, which is advantageous during maintenance.

[0142] Furthermore, the insulator may include an insulator support portion that extends from a position closer to the inner circumference than the winding in a substantially cylindrical shape toward the stator base and has a fixing structure for fixing the stator base.

[0143] According to such a configuration, when the coil 10 is wound from the radially outer side using a winding machine, the insulator support portion 33 does not hinder the winding, which is advantageous in terms of manufacturing.

[0144] Alternatively, the fixing structure may include a locking portion on the stator base that locks the insulator support portion, and a locked portion on the insulator support portion that locks with the locking portion. In other words, a fixing structure may be formed in which the insulator 9 is fixed to the stator base 4 using the stator base locking portion 35 provided on the stator base 4 and the insulator locked portion 34 provided on the insulator support portion 33.

[0145] Furthermore, the stator base may include a base wall portion located on the opposite side of the locking portion with the locked portion sandwiched therebetween, and the locked portion may be sandwiched between the locking portion and the base wall portion.

[0146] According to such a configuration, the insulator locked portion 34 can be clamped between the stator base locking portion 35 and the base wall portion 37 , thereby making the engagement between the stator base 4 and the insulator 9 firm.

[0147] Furthermore, the stator base may include a cap for biasing the locking portion toward the locked portion.

[0148] According to such a configuration, it is possible to suppress radially inward deflection of the stator base locking portion 35 .

[0149] Alternatively, the stator base may include a base wall portion located on the opposite side of the locking portion across the locked portion, and the cap may be configured to sandwich the locked portion between the locking portion and the base wall portion by biasing the cap.

[0150] According to such a structure, the clamping between the stator base locking portion 35 and the base wall portion 37 can be made stronger.

[0151] In addition, the motor involved in the present invention may also include: a stator, which has a stator core that is roughly cylindrical; a rotor, which has a magnet surrounding the stator core; a shaft, which passes through the roughly cylindrical center space and is fixed to the rotor; a bearing, which is inserted into the shaft and holds the shaft so that it can rotate freely relative to the stator; and a stator base, which is arranged opposite to one end in the axial direction of the roughly cylindrical shape and fixes the stator, and the stator base has a clamp insertion hole, which can allow a support clamp for supporting the bearing when the bearing is pressed into to pass through when the stator is fixed to the stator base.

[0152] According to such a configuration, one bearing 22 a can be press-fitted from the stator base 4 side in a state where the stator 2 is fixed to the stator base 4 without passing through the conventional protrusion 104 b.

[0153] Furthermore, the stator base may include a cap for closing the jig insertion hole.

[0154] According to such a configuration, foreign matter such as dust can be prevented from entering the inside of the stator 2 .

[0155] Furthermore, the jig insertion hole may be provided to be smaller than the outer circumference of the bearing to be supported.

[0156] According to such a structure, it is possible to prevent the bearing 22a on one side from coming out to the outside of the central space 27 due to gravity before being press-fitted.

[0157] In addition, it can also be constructed as follows: a pair of bearings are arranged on the shaft, and the stator core has a bearing locking portion, which protrudes from the inner wall of the stator core toward the axis in the central space to lock the movement of the pair of bearings in the roughly cylindrical axial direction to prevent the bearing of one of the pair of bearings from colliding with the bearing of the other. For a pair of bearings, one bearing is arranged on the opposite side of the other bearing across the bearing locking portion, and the pair of bearings are located in the central space at a position closer to the inner side of the stator core than the two end portions in the roughly cylindrical axial direction.

[0158] According to such a structure, collision between the one bearing 22a and the other bearing 22b can be prevented.

[0159] Alternatively, the stator may include a winding wound around the stator core and an insulator for insulating the stator core from the winding, and the stator may be fixed to the stator base via the insulator.

[0160] According to such a configuration, the stator core 8 can be engaged with the stator base 4 without passing through the conventional protrusion 104 b , so the shape of the stator base 4 can be easily changed, thereby improving the degree of freedom in product loading.

[0161] Alternatively, the press-fitting may be press-fitting into the shaft, and the support jig may directly support the bearing.

[0162] Furthermore, a retaining ring may be provided which is inserted into the shaft and restrains movement of the shaft in the axial direction, the press-fitting may be press-fitting into the stator core, and the support jig may support the bearing via the retaining ring.

[0163] Furthermore, the motor described above can also be mounted on a ventilator. Since the shape of the stator base 4 of the motor 1 can be freely changed according to the shape of the product mounted thereon, it is possible to take advantage of product deployment of the ventilator.

[0164] In addition, the manufacturing method of the motor involved in the present invention may also include the following steps: pressing one bearing of a pair of bearings into the shaft; arranging the other bearing of the pair of bearings on a bearing locking portion provided on the inner wall of the stator core in the central space of the stator core having an insulating member and a winding; fixing the stator core to the stator base via the insulating member; inserting a support fixture from a fixture insertion hole provided in the stator base to support the other bearing; inserting the shaft with one bearing pressed into the shaft into the central space of the roughly cylindrical stator core and pressing in the other bearing supported by the support fixture.

[0165] In addition, the manufacturing method of the motor involved in the present invention may also include the following steps: pressing a bearing into the inner wall of the stator core in the central space of the stator core having an insulating member and a winding; fixing the stator core to the stator base via the insulating member; inserting a supporting fixture from a fixture insertion hole provided in the stator base and supporting the bearing via a retaining ring; inserting the shaft into the central space of the roughly cylindrical stator core and inserting the bearing and the retaining ring supported by the supporting fixture.

[0166] Industrial Applicability

[0167] The motor of the present invention can be applied as a motor mounted on a ventilation device.

[0168] Description of Reference Numerals

[0169] 1 motor

[0170] 2 stator

[0171] 3 rotors

[0172] 4 Stator base

[0173] 5 caps

[0174] 6 Magnets

[0175] 7-axis

[0176] 8 stator core

[0177] 9 Insulation

[0178] 9a First insulating member

[0179] 9b Second insulating member

[0180] 10 Coils

[0181] 11 base plate

[0182] 12 cylindrical part

[0183] 13 Winding section

[0184] 14 curved surface

[0185] 15 teeth

[0186] 16 adjacent departments

[0187] 17 Bearing locking part

[0188] 18 concave portion

[0189] 19 Contact prevention space

[0190] 22 bearings

[0191] 22a Bearing on one side

[0192] 22b The other side's bearing

[0193] 23 Elastomer

[0194] 24 Rotation Axis

[0195] 25a First steel plate

[0196] 25b Second steel plate

[0197] 26 Shaft through hole

[0198] 27 Central Space

[0199] 28 inner circle

[0200] 29 outer ring

[0201] 30 Clamp insertion hole

[0202] 31 Insulation base

[0203] 32 Board mounting section

[0204] 33 Insulation support portion

[0205] 34 Insulation member locked portion

[0206] 35 Stator base locking part

[0207] 36 Stator base locking portion

[0208] 37 base wall

[0209] 38 base arm

[0210] 39 base claw

[0211] 40 stopper

[0212] 41 Base inclined surface

[0213] 42 clamping space

[0214] 43 cover

[0215] 44 Cap locking part

[0216] 45 force-applying part

[0217] 46 Strengthening Department

[0218] 47 Cap arm

[0219] 48 Cap claw part

[0220] 49 cap inclined surface

[0221] 50 Support fixture

[0222] 51 Snap Ring

[0223] 52 Pressing part

[0224] 101 housing

[0225] 102 brushless motor

[0226] 103 Support Arm

[0227] 104 Bearing protrusion

[0228] 104a base end portion

[0229] 104b protrusion

[0230] 105a bearing

[0231] 105b bearings

[0232] 106 Rotation Axis

[0233] 107 rotor

[0234] 108 excitation core

[0235] 109 Excitation winding

[0236] 110 magnets

[0237] 111 Drive Control Unit

[0238] 112 Rotating fan.

Claims

1. A motor comprising: a stator having a substantially cylindrical stator core; a rotor having magnets surrounding the stator core; a shaft extending through the substantially cylindrical central space and fixed to the rotor; and a pair of bearings inserted into the shaft and holding the shaft so as to be rotatable relative to the stator, The stator core includes a bearing locking portion, which protrudes from the inner wall of the stator core in the direction of the axis in the central space to lock the movement of the pair of bearings in the axial direction of the substantially cylindrical shape, thereby preventing collision between one bearing of the pair of bearings and the other bearing. For the pair of bearings, The one bearing is provided on the opposite side of the other bearing with the bearing locking portion interposed therebetween. The pair of bearings are located in the central space on the inner side of the stator core relative to both axial end portions of the substantially cylindrical shape.

2. The motor according to claim 1, wherein With respect to the pair of bearings, at least one end of each of the pair of bearings is located inside the stator core in the central space.

3. The motor according to claim 1, wherein The stator core is formed into the substantially cylindrical shape by stacking a plurality of substantially disk-shaped steel plates in the axial direction. The stator core forms the bearing locking portion by making the inner circumference of at least one of the plurality of steel plates smaller than the outer circumferences of the pair of bearings.

4. The motor according to claim 1, wherein The pair of bearings comprises: an inner race, which is inserted into the shaft; an outer ring disposed on the outer periphery of the inner ring; and a plurality of rolling elements held in a rollable manner between the outer periphery of the inner ring and the inner periphery of the outer ring, The bearing locking portion includes an elastic body, In at least one of the bearings, the elastic body urges the outer ring toward the outside in the axial direction relative to the inner ring.

5. The motor according to claim 4, wherein The stator core includes a contact prevention space between the shaft and the protruding front end of the bearing locking portion for preventing the inner ring from coming into contact with the bearing locking portion.

6. A motor comprising: a stator having a substantially cylindrical stator core; a rotor having magnets surrounding the stator core; a shaft extending through the substantially cylindrical central space and fixed to the rotor; a winding wound around the stator core; an insulating member for insulating the stator core from the winding; and A stator base is provided to face one axial end of the substantially cylindrical shape and fixes the stator via the insulating member.

7. The motor according to claim 6, wherein The stator base is detachably held by the stator via the insulating member.

8. The motor according to claim 6, wherein The insulator includes an insulator support portion that extends from a position closer to the inner circumference of the winding in the substantially cylindrical shape toward the stator base and has a fixing structure for fixing the stator base.

9. The motor according to claim 8, wherein The fixing structure includes a locking portion on the stator base for locking the insulator support portion. The fixing structure includes a locked portion locked to the locking portion on the insulator support portion.

10. The motor according to claim 9, wherein The stator base includes a base wall portion located on the opposite side of the locking portion across the locked portion. The stator base clamps the locked portion between the locking portion and the base wall portion.

11. The motor according to claim 9, wherein The stator base includes a cap that urges the locking portion toward the locked portion.

12. The motor according to claim 11, wherein The stator base includes a base wall portion located on the opposite side of the locking portion across the locked portion. The cap clamps the locked portion between the locking portion and the base wall portion due to the biasing force.

13. The motor according to claim 10, wherein The motor includes a substrate to which ends of the windings are connected. The insulating member includes a substrate placement portion extending in the direction of the stator base and configured to place the substrate between the winding and the stator base. The substrate placement portion holds the substrate between the substrate placement portion and the base wall portion.

14. A motor comprising: a stator having a substantially cylindrical stator core; a rotor having magnets surrounding the stator core; a shaft extending through the substantially cylindrical central space and fixed to the rotor; a bearing that is inserted into the shaft and holds the shaft so as to be rotatable relative to the stator; and a stator base, which is provided opposite to one axial end of the substantially cylindrical shape and fixes the stator, The stator base includes a jig insertion hole through which a support jig for supporting the bearing when the bearing is press-fitted can be passed in a state in which the stator is fixed to the stator base.

15. The motor according to claim 14, wherein The stator base includes a cap that closes the jig insertion hole.

16. The motor according to claim 14, wherein The jig insertion hole is set to be smaller than the outer circumference of the bearing as the object of the support.

17. The motor according to claim 14, wherein The bearing is provided on the shaft in a pair. The stator core includes a bearing locking portion, which protrudes from the inner wall of the stator core in the direction of the axis in the central space to lock the movement of the pair of bearings in the axial direction of the substantially cylindrical shape, thereby preventing collision between one bearing of the pair of bearings and the other bearing. For the pair of bearings, The one bearing is provided on the opposite side of the other bearing with the bearing locking portion interposed therebetween. The pair of bearings are located in the central space on the inner side of the stator core relative to both axial end portions of the substantially cylindrical shape.

18. The motor according to claim 14, wherein The motor has: a winding wound around the stator core; and an insulating member for insulating the stator core from the windings, The stator base fixes the stator via the insulating member.

19. A ventilation device, wherein: The ventilation device includes the motor according to any one of claims 1 to 18.

20. The motor according to claim 14, wherein The pressing is pressing into the shaft, The supporting fixture directly supports the bearing.

21. The motor according to claim 14, wherein The motor includes a snap ring that is inserted into the shaft and inhibits movement of the shaft in the axial direction. The press-fitting is press-fitting into the stator core, The supporting jig supports the bearing via the snap ring.

22. A method for manufacturing a motor, wherein: The motor manufacturing method includes the following steps: Press one of the bearings into the shaft; The other of the pair of bearings is arranged in the central space of the stator core having an insulator and a winding on a bearing locking portion provided on an inner wall of the stator core; fixing the stator core to the stator base via the insulating member; inserting a support jig from a jig insertion hole provided in the stator base to support the other bearing; and The shaft into which the one bearing is press-fitted is inserted into the central space of a substantially cylindrical stator core, and the other bearing supported by the support jig is press-fitted.

23. A method for manufacturing a motor, wherein: The motor manufacturing method includes the following steps: Press-fitting a bearing into the inner wall of the stator core within the central space of the stator core having an insulator and a winding; fixing the stator core to the stator base via the insulating member; inserting a support jig from a jig insertion hole provided in the stator base to support the bearing via a snap ring; and The shaft is inserted into the central space of the substantially cylindrical stator core, and the bearing and the snap ring supported by the support jig are inserted therein.

Images