Hollow shaft motor

Abstract

The hollow shaft motor according to the present invention includes: a stator assembly including a stator and a busbar unit coupled to an upper portion of the stator; and a motor housing formed by resin molding around the stator assembly, the stator including: a stator core; an upper insulator coupled to the upper portion of the stator core; a lower insulator coupled to a lower portion of the stator core; and a coil wound around a tooth portion of the stator, the stator core being formed by laminating a plurality of thin core plates made of electrical steel sheets, the stator core comprising: a core base having a circular shape; and a plurality of teeth protruding from the core base in a hollow axis direction on the inner side of the stator core.

Description

Technical Field

[0001] This invention relates to hollow shaft motors. More specifically, this invention relates to hollow shaft motors having a structure in which the motor housing is suitable for integral manufacturing by insert injection molding when manufacturing the hollow shaft motor. Background Technology

[0002] Typically, in braking systems, the force acting on the brakes comes from the pressure generated by the master cylinder. To generate pressure in the master cylinder of such braking systems, the technology of utilizing an electric motor is widely used. This electric motor includes: a ball screw that engages with a hollow shaft by rotating the internal hollow shaft, rotating together within the hollow shaft; and a ball nut that moves up and down due to the rotation of the ball screw; therefore, it is commonly referred to as a hollow shaft motor.

[0003] As disclosed in Korean Patent No. 10-2123180, the existing hollow shaft motor has the following structure: as the stator assembly, which is formed by combining the stator core of the wound coil and the busbar housing, is combined with the motor housing made of metal stamping material, the hollow shaft rotor is positioned inside the stator assembly and an additional upper cover is combined with the busbar housing.

[0004] Due to the structure of the hollow shaft motor, when the stator assembly is combined with the electrode housing, operational tolerances make it difficult to ensure concentricity during hollow shaft rotation. In particular, to press the bearing into the hollow shaft housing, a bearing insertion space needs to be created through post-processing; however, this post-processing increases the number of steps. When the motor is operating, these operational tolerances or post-processing can lead to noise and vibration. Furthermore, as moisture or foreign matter penetrates into the stator assembly, it can negatively impact the motor's durability and reliability. Therefore, ensuring the proper functioning of the braking system becomes difficult.

[0005] To address these issues, the present invention provides a hollow shaft motor in which the stator assembly can be included internally through insert molding to simplify the manufacturing process and solve the aforementioned problems. Summary of the Invention

[0006] The purpose of this invention is to provide a hollow shaft motor that simplifies the manufacturing process.

[0007] Another object of the present invention is to provide a hollow shaft motor in which concentricity can be ensured by eliminating assembly tolerances of the hollow shaft motor.

[0008] Another object of the present invention is to provide a hollow shaft motor that can prevent noise and vibration during the operation of the hollow shaft motor.

[0009] Another object of the present invention is to provide a hollow shaft motor that can prevent moisture from penetrating into the stator assembly of the hollow shaft motor.

[0010] The above-mentioned and other inherent objectives of the present invention can be easily achieved by the present invention as described below.

[0011] The hollow shaft motor of the present invention is characterized by comprising: a stator assembly 10, including a stator 11 and a busbar unit 12, the busbar unit 12 being coupled to the upper part of the stator 11; and a motor housing 20, formed by resin molding around the stator assembly 10, the stator 11 including: a stator core 110; an upper insulator 111 coupled to the upper part of the stator core 110; a lower insulator 112 coupled to the lower part of the stator core 110; and a coil 113 wound around the teeth of the stator 11, the stator core 110 being formed by stacking multiple thin core plates made of electrical steel sheet, the stator core 110 including: a core base 110A, which is circular; and multiple teeth 110B protruding from the core base 110A along the hollow shaft direction inside the stator core 110.

[0012] In this invention, preferably, a plurality of outer core grooves 110A-1 are formed on the outer surface of the core base 110A at predetermined intervals along the vertical direction. When the motor housing 20 is formed on the stator assembly 10 by inlay injection molding, the resin melt fills the outer core grooves 110A-1.

[0013] In this invention, preferably, the motor housing 20 includes: a body 21, which forms an inner space empty structure so that the hollow shaft rotor is positioned in the inner space; and a flange 22, which extends along the outer side and is formed on the upper part of the body 21.

[0014] In this invention, preferably, a busbar cover 23 molded from resin is formed on the inner side of the flange 22 to cover the busbar unit 12.

[0015] In this invention, preferably, a lower protrusion 24 is formed in the lower part of the body 21, which is ring-shaped and protrudes along the lower part.

[0016] In this invention, preferably, the bus unit 12 includes: a plurality of busbars 120; and a prefabricated mold 121 for fixing the busbars 120.

[0017] In this invention, preferably, the upper insulator 111 includes: an upper base insulating portion 111A, which is ring-shaped and attached to the upper part of the core base 110A; an upper tooth insulating portion 111B, which is attached to the upper part of the tooth 110B; and an upper slot insulating portion 111C, which is used to insulate the upper side of the inner surface of the slot 110C, wherein the slot 110C is the space between the teeth.

[0018] In this invention, preferably, a plurality of coil support pieces 111A-1 protruding along the upper part are formed on the upper base insulation portion 111A, and the coil support pieces 111A-1 have one or more coil connection portions 111A-2 formed on their upper parts.

[0019] In this invention, preferably, a coil support plate hole 111A-1' is formed in the coil support plate 111A-1 through the axial direction.

[0020] In this invention, preferably, a coil support plate groove 111A-1 is formed on the outer side of the coil support plate 111A-1.

[0021] The present invention has the following effects: when the stator assembly is positioned in the inlay molding mold, not only can the manufacturing process be simplified by injection molding to form the motor housing, but also concentricity can be ensured by eliminating the assembly tolerance of the hollow shaft motor. Thus, the noise and vibration generated during the operation of the motor can be minimized, and moisture can be effectively prevented from penetrating into the interior of the hollow shaft motor. Attached Figure Description

[0022] Figure 1 This is a perspective view of the hollow shaft motor of the present invention viewed from above.

[0023] Figure 2 This is a perspective view of the hollow shaft motor of the present invention viewed from below.

[0024] Figure 3 An exploded perspective view of the stator assembly and motor housing of the hollow shaft motor of the present invention is shown.

[0025] Figure 4 This is a perspective view showing a portion of the hollow shaft motor of the present invention.

[0026] Figure 5 This is a perspective view of the stator assembly of the hollow shaft motor of the present invention, viewed from above.

[0027] Figure 6 This is a perspective view of the stator assembly of the hollow shaft motor of the present invention, viewed from below.

[0028] Figure 7 An exploded perspective view of the stator of the hollow shaft motor of the present invention, viewed from above.

[0029] Figure 8 An exploded perspective view of the stator of the hollow shaft motor of the present invention, viewed from below.

[0030] Figure 9 This is an exploded perspective view of the stator and busbar units of the stator assembly of the hollow shaft motor of the present invention.

[0031] Figure 10 A perspective view of the busbar unit of the hollow shaft motor of the present invention, viewed from below.

[0032] Figure 11 An exploded perspective view of the busbar and prefabricated mold of the busbar unit of the hollow shaft motor of the present invention.

[0033] Figure 12 An exploded perspective view of the busbar and prefabricated mold of the busbar unit of the hollow shaft motor of the present invention, viewed from below.

[0034] The present invention will now be described in detail with reference to the accompanying drawings. Detailed Implementation

[0035] Figure 1 To view the hollow shaft motor 1 of the present invention from above, Figure 2 This is a three-dimensional view viewed from below. Figure 3 To show the exploded perspective view of the stator assembly 10 and the motor housing 20 of the hollow shaft motor 1 of the present invention, Figure 4 This is a perspective view showing a portion of the hollow shaft motor 1 of the present invention.

[0036] like Figures 1 to 4 As shown, the hollow shaft motor 1 of the present invention includes: a stator assembly 10; and a motor housing 20, which is formed by resin molding around the stator assembly 10.

[0037] The stator assembly 10 includes a stator 11 and a busbar unit 12 attached to the upper part of the stator 11. After the stator assembly 10 is positioned in an insert molding die, it is integrally formed around the stator assembly 10 by injection molding, i.e., by insert injection molding, for injecting molten plastic resin. A hollow shaft rotor (not shown) is positioned within the internal space of the stator assembly 10 and is rotatably coupled to the motor housing 20.

[0038] The stator 11 includes: a stator core 110; an upper insulator 111 attached to the upper part of the stator core 110; a lower insulator 112 attached to the lower part of the stator core 110; and a coil 113 wound around the teeth of the stator 11.

[0039] The stator core 110 is formed by stacking multiple thin core plates made of electrical steel sheet. The stator core 110 includes: a core base 110A, which is circular; and multiple teeth 110B, which protrude from the core base 110A along the hollow axis of the inner side of the stator core 110. The space formed by two adjacent teeth 110B is a slot 110C.

[0040] Multiple outer core grooves 110A-1 are formed on the outer surface of the core base 110A at predetermined intervals along the vertical direction. When the motor housing 20 is formed on the stator assembly 10 by insert injection molding, resin melt can be injected into the outer core grooves 110A-1 to increase the bonding force between the motor housing 20 and the stator core 110.

[0041] The axial end of the tooth portion 110B is a tooth end portion 110B-1 that protrudes along both sides in the circumferential direction. An inner tooth end groove 110B-1' that forms in the vertical direction is formed in the middle portion of the tooth end portion 110B-1. Resin is also injected into the inner tooth end groove 110B-1' to form part of the motor housing 20. In this specification, the term "axial direction" refers to the direction of the center of the circular shape when the core base 110A is viewed from above. The coil winding 113A wound on the tooth portion 110B is positioned in the slot 110C.

[0042] The upper insulator 111 attached to the upper part of the stator core 110 includes: an upper base insulation portion 111A, which is attached to the upper part of the core base 110A in a ring shape; an upper tooth insulation portion 111B, which is attached to the upper part of the tooth portion 110B; and an upper slot insulation portion 111C, which is used to insulate the upper side of the inner surface of the slot 110C.

[0043] The lower insulator 112, attached to the lower part of the stator core 110, includes: a lower base insulation portion 112A, which is ring-shaped and attached to the lower part of the core base 110A; a lower tooth insulation portion 112B, which is attached to the lower part of the tooth portion 110B; and a lower slot insulation portion 112C, which is used to insulate the lower side of the inner surface of the slot 110C. The lower slot insulation portion 112C is joined and assembled with the upper slot insulation portion 111C to insulate the inner surface of the slot 110C.

[0044] Busbar unit 12 is attached to the upper part of stator 11. Specifically, it is attached to the upper insulator 111 of stator 11. The attachment structure of busbar unit 12 and upper insulator 111 will be described in detail below.

[0045] Bus unit 12 includes: a plurality of buses 120; and a prefabricated mold 121, which is combined with the bus 120. While the number of bus 120 is not particularly limited, in the case of a three-phase brushless DC motor (BLDC), it is preferable to use three buses to connect the U-phase, V-phase, and W-phase. The accompanying drawings show the use of three bus 120s. Each bus 120 includes: a circular bus body 120A; a plurality of coil wiring portions 120B formed along the outer diameter direction on the bus body 120A; and terminal blocks 120C formed extending upwards from the end of the bus body 120A.

[0046] A terminal cover 13 surrounds a plurality of terminal terminals 120C for protection. The terminal cover 13 is integrated with a preform 121, protruding along the upper side of a busbar cover 23 and integrated with a busbar unit 12. Preferably, the terminal cover 13 can also be formed by insert injection molding while the stator 11 is integrated with the busbar unit 12. In this case, resin flows in through the through-holes 120C' formed in the terminal terminals 120C, making the bond between the terminal terminals 120C and the resin molding strong. More preferably, the terminal cover 13 can also be formed simultaneously when the motor housing 20 is formed by insert molding. According to another embodiment, after the motor housing 20 is formed by insert molding, the terminal cover 13 can also be integrated with one side of the motor housing 20 by additional components. According to another embodiment, the terminal terminals 120C can also be protected by a structure in which the terminal cover 13 is not required, and the terminal guide 121D of the preform 121 covers all parts except the upper portion of the terminal terminals 120C.

[0047] The motor housing 20 includes a body 21, a flange 22, a busbar cover 23, a lower protrusion 24, an upper bearing press-in portion 25, and a lower bearing press-in portion 26. Since the motor housing 20 is injection molded from resin, all parts of the motor housing 20 can be formed as a single integrated component.

[0048] The body 21 has an empty inner space, allowing the hollow shaft rotor to be positioned within the inner space. A stator assembly 10 is embedded inside the body 21. A flange 22 extending outwards is formed on the upper part of the body 21. A busbar cover 23, molded from resin, is formed inside the flange 22 to cover the busbar unit 12. A lower protrusion 24, in an annular shape, protrudes from the lower part of the body 21.

[0049] An upper bearing press-in portion 25 is formed on the inner side of the busbar cover 23 for pressing in an upper bearing (not shown), and a lower bearing press-in portion 26 is formed on the inner side of the lower protrusion 24 for pressing in a lower bearing (not shown). A lower height difference portion 26A can be formed along the outer periphery of the lower bearing press-in portion 26 to prevent the lower bearing from disengaging. A lower cover engagement portion 24A for engaging a lower cover (not shown) is formed at the lower part of the lower protrusion 24.

[0050] Multiple central engagement teeth 23A are formed around the upper periphery of the inner space portion of the manifold cover 23, protruding upwards. The central engagement teeth 23A provide a structure for engaging the piston mechanism (not shown) of the master cylinder with the hollow shaft motor 1. A boundary groove 23B is formed around the upper part of the manifold cover 23. When the hollow shaft motor 1 engages with the master cylinder, the boundary groove 23B refers to a groove for engaging sealing components (not shown) such as rubber or silicone.

[0051] Multiple confirmation holes 23C may also be formed on the upper part of the busbar cover 23. These confirmation holes 23C can be used to confirm whether the resin molding flows smoothly around the busbar 120. Depending on the situation, they can be connected to the internal viewing holes 121A-4 formed in the circular ring portion 121A of the preform mold 121 to confirm whether the resin molding flows smoothly around the coil winding 113A through the aforementioned holes 23C and 121A-4. In commercially available hollow shaft motors, it is not necessary to form the aforementioned holes 23C and 121A-4.

[0052] In the prior art, with the busbar cover combined with the motor housing and stator assembly, the busbar is connected to the end of the coil. Therefore, with the increase in work steps and the increase in work difficulty, more process time is required. However, for the hollow shaft motor 1 of the present invention, with the stator assembly 10 positioned in the insert molding mold, since the busbar cover 23 is formed integrally with the motor housing 20 by resin molding, the connection between the busbar and the coil can be simplified. Thus, manufacturing costs can be reduced and productivity can be increased by shortening the assembly process.

[0053] Figure 5 A perspective view of the stator assembly 10 of the hollow shaft motor 1 of the present invention is shown above. Figure 6 This is a perspective view of the stator assembly 10 from below. (Refer to...) Figure 5 and Figure 6 The stator assembly 10 of the present invention includes a stator 11, a busbar unit 12 and a terminal cover 13.

[0054] The stator 11 includes: a stator core 110; an upper insulator 111 attached to the upper part of the stator core 110; a lower insulator 112 attached to the lower part of the stator core 110; and a coil 113 wound on the tooth portion 110B with the upper insulator 111 and the lower insulator 112 attached to the stator core 110.

[0055] An upper end portion 111B-1 is formed at the axial end of the upper toothed insulating portion 111B of the upper insulator 111, protruding and joining the upper part of the toothed end portion 110B-1. An upper end portion groove 111B-1' is formed at the center of the axial end surface of the upper end portion 111B-1 along the vertical direction, communicating with the inner groove 110B-1' of the toothed end portion. Therefore, when forming the motor housing 20, resin is also injected into the upper end portion groove 111B-1', and the injected resin constitutes a part of the motor housing 20.

[0056] A lower end portion 112B-1 is formed at the axial end of the lower tooth insulation portion 112B, protruding and joining the lower part of the tooth end portion 110B-1. A lower end portion groove 112B-1' is formed at the center of the axial end surface of the lower end portion 112B-1, communicating with the inner groove 110B-1' of the tooth end portion. Therefore, when the motor housing 20 is formed, resin is also injected into the lower end portion groove 112B-1', and the injected resin constitutes a part of the motor housing 20.

[0057] The coil 113 wound around the teeth forms a coil winding 113A. The remaining space, excluding the space occupied by the coil winding 113A in the slot, can also be formed by resin molding through inlay molding. Therefore, as... Figure 4 As shown, after the motor housing 20 is formed, the axial surface of the tooth end portion 110B-1 is exposed to the internal space of the motor housing 20.

[0058] Figure 7 An exploded perspective view of the stator 11 of the hollow shaft motor 1 of the present invention is shown above. Figure 8 This is an exploded perspective view of stator 11 from below. (See attached image.) Figure 7 and Figure 8 As shown, the stator 11 of the present invention includes a stator core 110, an upper insulator 111, a lower insulator 112, and a coil 113.

[0059] The stator core 110 includes: a circular core base 110A; a plurality of teeth 110B protruding from the core base 110A along the hollow axis direction inside the stator core 110; and a slot 110C, which is a space formed by two adjacent teeth 110B.

[0060] The upper insulator 111 is attached to the upper part of the stator core 110 and includes: an upper base insulation portion 111A, which is attached to the upper part of the core base 110A in a ring shape; an upper tooth insulation portion 111B, which is attached to the upper part of the tooth portion 110B; and an upper slot insulation portion 111C, which is used to insulate the upper side of the inner surface of the slot 110C. An upper corrugated portion 111B' is formed on the upper surface of the upper tooth insulation portion 111B to facilitate the winding of the coil winding 113A. An inner groove 111B' of the upper tooth insulation portion is formed on the lower surface of the upper tooth insulation portion 111B, where resin can be injected for molding.

[0061] The lower insulator 112 is attached to the lower part of the stator core 110 and includes: a lower base insulation portion 112A, which is attached to the lower part of the core base 110A in a ring shape; a lower tooth insulation portion 112B, which is attached to the lower part of the tooth portion 110B; and a lower slot insulation portion 112C, which is used to insulate the lower side of the inner surface of the slot 110C. The lower slot insulation portion 112C is joined and assembled with the upper slot insulation portion 111C to insulate the inner surface of the slot 110C. A lower corrugated portion 112B' is formed on the lower surface of the lower tooth insulation portion 112B to facilitate the winding of the coil winding 113A. The lower tooth inner groove 112B' is formed on the upper surface of the lower tooth insulation portion 112B, and resin can be injected and molded in this part.

[0062] Coils 113 are wound around teeth 110B. The coil wound around teeth 110B includes: coil windings 113A; coil end portions 113B, which protrude upwards as the ends of the coils; and lower coil connecting portions 113C for connecting the coil windings 113A to each other. Coil end portions 113B are electrically connected to busbars 120 that are respectively connected to the in-phase coil windings 113A. The lower coil connecting portions 113C connect the in-phase coil windings 113A to the lower part of the stator 11, guided and fixed by a plurality of lower coil guides 112A-1 protruding along the lower part of the lower base insulation portion 112A of the lower insulator 112.

[0063] A plurality of coil support plates 111A-1 protruding upwards are formed on the upper base insulation portion 111A of the upper insulator 111. Each coil support plate 111A-1 has one or more coil coupling portions 111A-2 formed on its upper portion. The coil coupling portion 111A-2 engages with the coil end portion 113B to secure it. The number of coil support plates 111A-1 and coil coupling portions 111A-2 is not particularly limited; various quantities can be applied depending on the design requirements, such as the number of slots or the size of the stator.

[0064] A coil support plate hole 111A-1' is formed at the lower part of the coil end portion 113B of the coil support plate 111A-1, which extends along the axial direction. The resin mold passes through the coil support plate hole 111A-1', so that the resin mold is smoothly formed around the coil end portion 113B.

[0065] A coil support plate groove 111A-1 is formed on the outer side of the coil support plate 111A-1. As the resin mold is filled into the above-mentioned coil support plate groove 111A-1, the coil support plate 111A-1 is firmly bonded to the motor housing 20.

[0066] One or more first connecting protrusions 111A-3 are formed on a portion of the upper base insulation portion 111A, protruding upwards. A first insertion protrusion 111A-4 is formed on one side of the first connecting protrusion 111A-3. In the accompanying drawings, although the number of first connecting protrusions 111A-3 and first insertion protrusions 111A-4 is two, it is not limited to two, and various numbers can be applied according to design requirements.

[0067] One or more second connecting protrusions 111A-5 are formed opposite to the first connecting protrusion 111A-3 of the upper base insulation portion 111A. A first insertion protrusion 111A-6 is formed on one side of the second connecting protrusion 111A-5. In the accompanying drawings, although the number of the second connecting protrusions 111A-5 and the second insertion protrusions 111A-6 is two, it is not limited to two, and various numbers can be used according to design requirements.

[0068] On the circular upper base insulation portion 111A, since the first connecting protrusion 111A-3 and the second connecting protrusion 111A-5 are formed in opposite positions, the coil support piece 111A-1 is disposed between the first connecting protrusion 111A-3 and the second connecting protrusion 111A-5. That is, when viewed from above, when the first connecting protrusion 111A-3 is located at the 12 o'clock position and the second connecting protrusion 111A-5 is located at the 6 o'clock position, since the coil support piece 111A-1 is approximately located in the 2 o'clock to 4 o'clock and 8 o'clock to 10 o'clock positions, it not only simplifies the coil connection between the coil end portion 113B and the coil connection portion 120B, but also allows the coil end portion 113B and the coil connection portion 120B to be neatly arranged on both sides.

[0069] Figure 9 This is an exploded perspective view of the stator 11 and busbar unit 12 of the stator assembly 10 of the hollow shaft motor 1 of the present invention. Figure 10 A perspective view of the busbar unit 12 of the hollow shaft motor 1 of the present invention, viewed from below. Figure 11 An exploded perspective view of the busbar 120 of the busbar unit 12 of the hollow shaft motor 1 of the present invention and the prefabricated mold 121 is shown above. Figure 12 An exploded perspective view of the busbar 120 and the precast mold 121 from below.

[0070] Reference Figures 9 to 12 The busbar unit 12 of the hollow shaft motor 1 of the present invention includes a busbar 120 and a prefabricated mold 121.

[0071] Bus 120 refers to a conductor that electrically connects the coil ends 113B of the in-phase coil windings 113A to each other. There is no particular limitation on the number of bus 120s; an appropriate number of bus 120s can be used as needed. In the case of a three-phase brushless DC motor (BLDC), three bus 120s are used to connect the U-phase, V-phase, and W-phase to each other.

[0072] The prefabrication mold 121 is used to fix the busbar 120 to the upper part of the stator 11. For this purpose, the prefabrication mold 121 is combined with the upper insulator 111 of the stator 11.

[0073] Bus 120 includes: a circular bus body 120A; a plurality of coil wiring portions 120B protruding from one side of the bus body 120A; and terminal blocks 120C protruding from one side of the bus body 120A along its upper portion. In the accompanying drawings, since three bus 120s are used, a plurality of coil wiring portions 120B-1, 120B-2, 120B-3 and terminal blocks 120C-1, 120C-2, 120C-3 are shown on the three bus bodies 120A-1, 120A-2, and 120A-3, respectively.

[0074] The coil connection portion 120B is electrically connected to the coil end portion 113B. The coil end portion 113B can be connected to the coil connection portion 120B by methods such as fusion welding or soldering. For this purpose, the coil connection portion 120B can also be bent at the coil end portion 113B. Regarding these multiple coil connection portions 120B, if we assume the position of the terminal terminal 120C is at the 12 o'clock position, based on the plane of the busbar 120 viewed from above, then the coil connection portions 120B are approximately positioned between the 2 o'clock and 4 o'clock positions, and between the 8 o'clock and 10 o'clock positions.

[0075] The preform 121 is a structure made of polymer resin compound, used to guide the position of bus 120 so that the position of bus 120 is fixed on the upper part of stator 11, and performs the function of guiding terminal 120C.

[0076] The preform 121 includes: a circular ring portion 121A; a first connecting block 121B formed on one side of the circular ring portion 121A; a second connecting block 121C formed on the other side of the circular ring portion 121A; and a terminal guide 121D protruding from the other side of the circular ring portion 121A along the upper portion.

[0077] A circular ring portion 121A is attached to the upper part of the circular busbar body 120A of the busbar 120. Multiple first exposure holes 121A-1 are formed in the circular ring portion 121A. The busbar 120 can be viewed from above through the first exposure holes 121A-1, and resin molten material can be injected through the first exposure holes 121A-1 to mold resin between the busbars 120.

[0078] Multiple first busbar guides 121A-2 protrude from the lower part of the circular ring 121A and are integrated between multiple busbars 120, guiding the position of the busbars 120. Multiple second busbar guides 121A-3 protrude from the lower part of the circular ring 121A and are integrated between multiple busbars 120, guiding the position of the busbars 120 separately from the first busbar guides 121A-2. The second busbar guides 121A-3 can be omitted according to design requirements.

[0079] Multiple second exposure holes 121A-2' are formed through the circular ring portion 121A. The second exposure holes 121A-2' are formed in a manner that allows communication with the confirmation hole 23C of the busbar cover 23, enabling external confirmation of the resin molding state between the busbars 120. The second exposure holes 121A-2' can be omitted if required.

[0080] The side guide groove 121A-2” is formed on the outermost outer surface of the first busbar guide 121A-2. The bonding force between the outer peripheral surface of the outermost busbar body 120A-3 and the first busbar guide 121A-2 can be increased by filling the side guide groove 121A-2” with resin molding.

[0081] Multiple internal viewing holes 121A-4 are formed through the circular ring 121A, allowing the assembly status of the busbar body 120A to be confirmed before inlay molding. The internal viewing holes 121A-4 can be used for finished product quality testing, but do not need to be applied to products in actual mass production.

[0082] The first connecting block 121B is connected to one side of the circular ring portion 121A of the busbar body 120A, forming at a position corresponding to the first connecting protrusion 111A-3 of the upper insulator 111. The second connecting block 121C is formed on the other side of the circular ring portion 121A of the busbar body 120A, forming at a position corresponding to the second connecting protrusion 111A-5 of the upper insulator 111. For example... Figures 10 to 12 As shown, preferably, the first connecting block 121B and the second connecting block 121C are formed in opposite positions.

[0083] The first connecting block 121B and the second connecting block 121C are used to fix the busbar unit 12 to the upper part of the stator 11. For this purpose, one or more first connecting holes 121B-1 are formed in the first connecting block 121B. Figure 10A pair of first mating holes 121B-1 are formed in the upper insulator 111 to provide a stable mating. A first fixing protrusion 121B-1' is formed in the first mating hole 121B-1, protruding along the lower part. The first mating protrusion 111A-3 of the upper insulator 111 is inserted into the first mating hole 121B-1, while the first fixing protrusion 121B-1' is inserted into the outer groove 111A-3' of the first mating protrusion, thereby providing a stable mating.

[0084] Similarly, one or more second mating holes 121C-1 are also formed in the second mating block 121C. Figure 10 A pair of second coupling holes 121C-1 are formed in the upper insulator 111 to provide a stable connection. A second fixing protrusion 121C-1' is formed in the second coupling hole 121C-1, protruding along the lower part. The second coupling protrusion 111A-5 of the upper insulator 111 is inserted into the second coupling hole 121C-1, and at the same time, the second fixing protrusion 111C-1' is inserted into the outer groove 111A-5' of the second coupling protrusion, thereby providing a stable connection between them.

[0085] One or more first insertion holes 121B-2 are formed in the first mating block 121B, which are formed on one side of the first mating hole 121B-1. Figure 10 In the middle, two first insertion holes 121B-2 are formed on both sides of the first connecting hole 121B-1. The first insertion holes 121B-2 are combined with the first insertion protrusion 111A-4 of the upper insulator 111 and guide the combination of the busbar unit 12.

[0086] One or more second insertion holes 121C-2 are formed in the second mating block 121C, which are formed on one side of the second mating hole 121C-1. Figure 10 In the middle, two second insertion holes 121C-2 are formed on both sides of the second mating hole 121C-1. The second insertion holes 121C-2 are combined with the second insertion protrusion 111A-6 of the upper insulator 111 and guide the precise position.

[0087] The terminal guide 121D is used to guide and fix the position of the terminal 120C. Thus, during insert molding, the position of the terminal is prevented from changing due to injection pressure.

[0088] The above description of the invention is merely illustrative to help understand the invention and should not be construed as limiting the scope of protection of the invention. It should be understood that the scope of the invention should be defined based on the scope of the claims, and any simple modifications or alterations made to the invention within this scope fall within the protection scope of the invention.

Claims

1. A hollow shaft motor, characterized in that, include: A stator assembly includes a stator and a busbar unit, the busbar unit being coupled to the upper part of the stator; and The motor housing is formed of resin molding around the aforementioned stator assembly. The aforementioned stator includes: Stator core; The upper insulator is attached to the upper part of the stator core. The lower insulator is attached to the lower part of the aforementioned stator core; and The coil is wound around the teeth of the stator. The aforementioned stator core is composed of multiple thin core plates made of electrical steel sheets stacked together. The aforementioned stator core includes: Core base, circular in shape; and Multiple teeth protrude from the core base along the hollow axis inside the stator core.

2. The hollow shaft motor according to claim 1, characterized in that, Multiple outer core grooves are formed on the outer surface of the core base at predetermined intervals along the vertical direction. When the motor housing is formed on the stator assembly by inlay injection molding, the resin melt fills the outer core grooves.

3. The hollow shaft motor according to claim 2, characterized in that, The aforementioned motor housing includes: The body forms a structure with an empty inner space, so that the aforementioned hollow shaft rotor is positioned within the inner space; and A flange extends along the outer side and is formed on the upper part of the aforementioned body.

4. The hollow shaft motor according to claim 3, characterized in that, A bus cover made of resin is formed on the inner side of the aforementioned flange to cover the aforementioned bus unit.

5. The hollow shaft motor according to claim 3, characterized in that, A lower protrusion is formed at the lower part of the aforementioned body, which is ring-shaped and protrudes along the lower part.

6. The hollow shaft motor according to claim 2, characterized in that, The above bus unit includes: Multiple buses; and Precast molds are used to fix the aforementioned busbars.

7. The hollow shaft motor according to claim 1, characterized in that, The aforementioned upper insulator includes: The upper base insulation part is joined to the upper part of the core base in a ring shape; The upper tooth insulating part is attached to the upper part of the aforementioned tooth; and The upper slot insulation portion is used to insulate the upper side of the inner surface of the slot, and the slot is the space between the teeth.

8. The hollow shaft motor according to claim 7, characterized in that, Multiple coil support plates protruding along the upper part are formed on the upper base insulation portion, and one or more coil connection portions are formed on the upper part of the coil support plates.

9. The hollow shaft motor according to claim 8, characterized in that, The aforementioned coil support plate has a through-hole formed along the axial direction.

10. The hollow shaft motor according to claim 8, characterized in that, A coil support plate groove is formed on the outer side of the aforementioned coil support plate.

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