Internal buckling type brushless motor and manufacturing method thereof

Abstract

The invention discloses an inner buckle type brushless motor and a manufacturing method thereof, the inner buckle type brushless motor comprises a rotor, a stator and an output shaft, the rotor is arranged on the periphery of the stator, the rotor sleeves the output shaft, the rotor comprises a shell, a cover block and a permanent magnet, the shell is provided with an accommodating cavity, and the permanent magnet is arranged in the accommodating cavity. The shell is provided with an inverted buckle extending towards the center of the containing cavity, the side portion of the cover block is provided with an annular groove, the bottom of the cover block is provided with an extending block, the extending block is embedded in the containing cavity, the inverted buckle is embedded in the annular groove, and the permanent magnet is embedded in the containing cavity and abuts against the extending block. According to the internal buckling type brushless motor, the cover block on the rotor can be fixed by the inverted buckle of the shell and the permanent magnet, compared with a traditional external pressing type cover block, the design is high in fixing reliability of the cover block, the concentricity of the cover block and the shell can be better guaranteed, the probability that the cover block is separated from the shell when the rotor rotates at a high speed is effectively reduced, and the service life of the motor is prolonged. And the safety is improved.

Description

Technical Field

[0001] The present invention relates to the field of motor design, and in particular to an inward-facing brushless motor and a manufacturing method thereof. Background Art

[0002] A motor, also known as an electric motor, is a mechanical device that converts electrical energy into mechanical energy. Depending on whether or not carbon brushes are set, motors are often divided into brushed motors and brushless motors. Brushless motors can use electronic commutation, and are usually less prone to damage than brushed motors. They are reliable and have been widely used.

[0003] Depending on the arrangement of the rotor and stator, brushless motors are often divided into inner rotor type and outer rotor type. In the outer rotor brushless motor, the rotor is arranged outside the stator.

[0004] On current outer rotor brushless motors, a cover block is often required to be connected to the outer casing on the rotor side, and the cover block is mostly mounted on the outer casing by press-fitting. However, in the above processing method, the cover block is fixed by press-fitting, so its fixing reliability is low and it is difficult to ensure high concentricity. When the motor rotates at high speed, the cover block is prone to large vibrations and even separation from the outer casing, posing a great safety hazard. Summary of the invention

[0005] The object of the present invention is to provide an inward-facing brushless motor that can solve one or more of the above-mentioned problems.

[0006] According to one aspect of the present invention, there is provided an inward-facing brushless motor, comprising a rotor, a stator and an output shaft, wherein the rotor is arranged on the periphery of the stator, the rotor is sleeved on the output shaft, the rotor comprises a shell, a cover block and a permanent magnet, the shell is provided with a accommodating cavity, the shell is provided with an undercut extending toward the center of the accommodating cavity, the side of the cover block is provided with an annular groove, the bottom of the cover block is provided with an extension block, the extension block is embedded in the accommodating cavity, the undercut is embedded in the annular groove, the permanent magnet is embedded in the accommodating cavity and abuts against the extension block.

[0007] The beneficial effect of the inward-facing brushless motor is that the cover block on the rotor can be fixed by the undercut of the outer shell and the permanent magnet. Compared with the traditional external pressure cover block, this design has strong fixation reliability for the cover block and can better ensure the concentricity of the cover block and the outer shell, thereby effectively reducing the probability of the cover block detaching from the outer shell when the rotor rotates at high speed, thereby improving safety.

[0008] In some embodiments, the inner-locking brushless motor further includes a mounting member and a first bearing, wherein the stator is sleeved on the mounting member, the first bearing is embedded in the mounting member, and the first bearing is sleeved on the output shaft. The provision of the mounting member can facilitate the fixation of the stator, and by providing the first bearing, the output shaft can rotate in the mounting member.

[0009] In some embodiments, the stator includes an iron core and a winding, the winding is disposed on the iron core, the iron core is provided with a through hole, the mounting member is provided with a shaft portion, and the shaft portion is embedded in the through hole.

[0010] In some embodiments, the inner-locking brushless motor further includes a second bearing, which is embedded in the mounting member and sleeved on the output shaft. The provision of the second bearing can better reduce the probability of the output shaft moving on the mounting member other than rotation, and improve the rotation reliability of the output shaft.

[0011] In some embodiments, the mounting member is provided with a mounting portion, a protrusion is provided on a side of the mounting portion, and a mounting hole is provided on the protrusion. The provision of the mounting portion can facilitate the installation of the mounting member on the external fixed structure.

[0012] In some embodiments, the cover block is provided with a central hole, a groove is provided in the central hole, the output shaft is provided with a protrusion, the output shaft passes through the central hole, and the protrusion is embedded in the groove. The arrangement of the protrusion and the groove can increase the contact area between the output shaft and the cover block, thereby improving the fixing reliability of the cover block on the output shaft.

[0013] In some embodiments, the extension block is provided with a plurality of spacers, and permanent magnets are provided between adjacent spacers. The spacers can limit the position of the permanent magnets and reduce the probability of the permanent magnets being offset when the rotor rotates.

[0014] In some embodiments, the cover block is provided with a heat dissipation hole, and the heat dissipation hole is connected to the accommodating cavity. The provision of the heat dissipation hole can facilitate the heat dissipation generated by the stator and improve the working reliability of the inner buckle brushless motor.

[0015] According to one aspect of the present invention, a method for manufacturing an inward-facing motor is provided, comprising the following steps:

[0016] Take the output shaft and the cover block with the annular groove, press the output shaft into the cover block, so that the cover block is fixedly sleeved on the output shaft, and obtain the cover block with shaft;

[0017] Take the housing provided with the accommodating cavity and the undercut, place the shaft cover block under the accommodating cavity, and then press the shaft cover block into the accommodating cavity from bottom to top until the undercut is embedded in the annular groove to obtain a semi-finished product;

[0018] Take a permanent magnet, place the permanent magnet below the receiving cavity of the semi-finished product, and then press the permanent magnet into the receiving cavity from bottom to top until the permanent magnet abuts against the cover block;

[0019] Take the stator and assemble it on the output shaft to obtain an inward-facing motor.

[0020] The beneficial effect of the manufacturing method of the inward-facing brushless motor is that in the manufacturing method, the cover block is pressed into the outer shell in the form of an inward buckle from bottom to top. Compared with the traditional pressing form from top to bottom, this method can better ensure the concentricity of the cover block and the outer shell, so as to effectively reduce the vibration of the cover block when the rotor rotates, and the allowable volume of the cover block is smaller under this form to obtain a lower mass, so the rotational inertia of the rotor is smaller and can have a higher response speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of an inward-facing brushless motor according to an embodiment of the present invention.

[0022] Figure 2 An exploded view of the structural schematic diagram of an inward-facing brushless motor according to an embodiment of the present invention.

[0023] Figure 3 A cross-sectional view of an inward-facing brushless motor according to an embodiment of the present invention.

[0024] Figure 4 The figure is a schematic structural diagram of a cover block of an inward-facing brushless motor according to an embodiment of the present invention.

[0025] Figure 5 This is a schematic diagram of the connection between the cover block and the outer shell of an inward-facing brushless motor according to an embodiment of the present invention.

[0026] In the figure: 1. rotor, 2. stator, 3. output shaft, 4. mounting part, 5. first bearing, 6. second bearing, 11. housing, 12. cover block, 13. permanent magnet, 111. accommodating cavity, 112. undercut, 121. annular groove, 122. extension block, 123. center hole, 124. groove, 125. heat dissipation hole, 1221. spacer, 21. core, 211. through hole, 31. protrusion, 41. shaft, 42. mounting part, 421. protrusion, 422. mounting hole, 423. limit block. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0028] Example 1

[0029] refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 , an inward-facing brushless motor of this embodiment includes a rotor 1, a stator 2 and an output shaft 3.

[0030] The rotor 1 comprises a housing 11 , a cover block 12 and a permanent magnet 13 . A receiving cavity 111 is provided in the housing 11 , and an undercut 112 extending toward the center of the receiving cavity 111 is provided at one end of the housing 11 .

[0031] An annular groove 121 is provided on the side of the cover block 12, and an extension block 122 is provided on the bottom of the cover block 12. The extension block 122 is fixedly embedded in the accommodating cavity 111, so that the extension block 122 is attached to the inner wall of the accommodating cavity 111, and the undercut 112 is embedded in the annular groove 121. The permanent magnet 13 is fixedly embedded in the accommodating cavity 111, so that the permanent magnet 13 is also attached to the inner wall of the accommodating cavity 111, and the permanent magnet 13 is abutted against the extension block 122, so that the cover block 12 can be effectively fixed on the outer shell 11.

[0032] A plurality of spacer blocks 1221 are further provided on the extension block 122 , and permanent magnets 13 are provided between adjacent spacer blocks 1221 . The spacer blocks 1221 can better fix the positions of the permanent magnets 13 .

[0033] A center hole 123 is provided in the middle of the cover block 12 of the rotor 1 , a groove 124 is provided in the center hole 123 , a protrusion 31 is provided on the output shaft 3 , the output shaft 3 passes through the center hole 123 , and the cover block 12 is fixedly mounted on the output shaft 3 , and the protrusion 31 is embedded in the groove 124 .

[0034] The stator 2 includes an iron core 21 and a winding (not shown in the figure), and the winding is fixedly wound on the iron core 21 .

[0035] The inner buckle brushless motor further includes a mounting member 4. The iron core 21 is provided with a through hole 211, and the mounting member 4 is provided with a shaft portion 41, which is fixedly embedded in the through hole 211 and abuts against the inner wall of the through hole 211, so that the stator 2 is fixedly sleeved on the mounting member 4.

[0036] The internally-entangled brushless motor further includes a first bearing 5 , which is fixedly embedded in the shaft portion 41 of the mounting member 4 , and the first bearing 5 is sleeved on the output shaft 3 , so that the output shaft 3 can rotate on the mounting member 4 .

[0037] The mounting member 4 is provided with a mounting portion 42 , a side portion of the mounting portion 42 is provided with a plurality of protrusions 421 , and the protrusions 421 are provided with mounting holes 422 .

[0038] The internally-entangled brushless motor further includes a second bearing 6 , which is fixedly embedded in the mounting portion 42 of the mounting member 4 , and is also sleeved on the output shaft 3 .

[0039] After setting, the permanent magnet 13 on the rotor 1 will be arranged on the periphery of the stator 2, and the stator 2 will also be located in the accommodating cavity 111, and the cover block 12 is provided with a heat dissipation hole 125, and there are multiple heat dissipation holes 125. All heat dissipation holes 125 are connected with the accommodating cavity 111, so that the heat generated by the stator 2 during operation can be discharged through the accommodating cavity 111.

[0040] A limiting block 423 is also provided on the mounting portion 42. A limiting hole is provided in the limiting block. The wire extending from the winding can pass through the limiting hole, so that the limiting block 423 can effectively limit the above-mentioned wire.

[0041] When the inward-facing brushless motor is in use, the winding of the stator 2 can be electrically connected to an external circuit, so that the winding can generate an electromagnetic field to drive the permanent magnet 13 to rotate. The rotation of the permanent magnet 13 can drive the outer shell 11 to rotate, and the cover block 12 connected to the outer shell 11 can also rotate accordingly. The rotation of the cover block 12 can drive the output shaft 3 to rotate, and the output shaft 3 can output power.

[0042] In this inward-facing brushless motor, the cover block 12 on the rotor 1 can be fixed by the undercut 112 of the outer shell 11 and the permanent magnet 13. Compared with the traditional external pressure cover block, this design has strong fixing reliability for the cover block 12 and can better ensure the concentricity of the cover block 12 and the outer shell 11, thereby effectively reducing the probability of the cover block 12 being separated from the outer shell 11 when the rotor 1 rotates at high speed, and can better adapt to high-speed requirements and improve safety.

[0043] Example 2

[0044] refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 This embodiment is a method for manufacturing the inner-buckle brushless motor of embodiment 1, comprising the following steps:

[0045] Take the output shaft 3 and the cover block 12 with an annular groove 121, the output shaft 3 is provided with a protrusion 31, and the middle of the cover block 12 is provided with a center hole 123, and the center hole 123 is provided with a groove 124. Use a pressing machine to press the output shaft 3 into the cover block 12 until the protrusion 31 is embedded in the groove 124, and the output shaft 3 passes through the center hole 123, so that the cover block 12 is fixedly mounted on the output shaft 3 to obtain a cover block with a shaft.

[0046] Take the shell 11 provided with the accommodating cavity 111 and the undercut 112, place the above-mentioned shaft cover block under the accommodating cavity 111, and then press the shaft cover block into the accommodating cavity 111 from bottom to top through a pressing machine until the undercut 112 is embedded in the annular groove 121 to obtain a semi-finished product.

[0047] Take the permanent magnet 13 and place it under the receiving cavity 111 of the semi-finished product. Then press the permanent magnet 13 into the receiving cavity 111 from bottom to top until the permanent magnet 13 abuts against the bottom of the cover block 12, so that the permanent magnet 13 is effectively fixed in the cover block 12.

[0048] Take the stator 2 and assemble it on the output shaft 3. Preferably, take the mounting member 4, the first bearing 5 and the second bearing 6. The mounting member 4 is provided with a shaft portion 41, and the shaft portion 41 is pressed into the stator by a pressing machine, so that the stator 2 is fixedly mounted on the mounting member 4. The first bearing 5 and the second bearing 6 are both pressed into the mounting member 4 by a pressing machine and mounted on the output shaft 3, so that the stator 2 is assembled on the output shaft 3 to obtain an inward-locking motor.

[0049] In this manufacturing method, the cover block 12 is pressed into the outer shell 11 in the form of an inward buckle from bottom to top. Compared with the traditional pressing form from top to bottom, this method can better ensure the concentricity of the cover block 12 and the outer shell 11, so as to effectively reduce the vibration of the cover block 12 when the rotor 1 rotates. Moreover, the allowable volume of the cover block 12 is smaller in this form to obtain a lower mass, so the rotational inertia of the rotor 1 is smaller and can have a higher response speed.

[0050] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. Inward-facing brushless motor, characterized in that: The invention comprises a rotor, a stator and an output shaft, wherein the rotor is arranged at the periphery of the stator and is sleeved on the output shaft. The rotor comprises a shell, a cover block and a permanent magnet. The shell is provided with a receiving cavity, and the shell is provided with an undercut extending toward the center of the receiving cavity. The side of the cover block is provided with an annular groove, and the bottom of the cover block is provided with an extension block, and the extension block is embedded in the receiving cavity. The undercut is embedded in the annular groove. The permanent magnet is embedded in the receiving cavity and abuts against the extension block.

2. The inward-facing brushless motor according to claim 1, characterized in that: It comprises a mounting piece and a first bearing. The stator is sleeved on the mounting piece, the first bearing is embedded in the mounting piece, and the first bearing is sleeved on the output shaft.

3. The inner-folding brushless motor according to claim 2, characterized in that: The stator comprises an iron core and a winding, wherein the winding is arranged on the iron core, the iron core is provided with a through hole, and the mounting member is provided with a shaft portion, and the shaft portion is embedded in the through hole.

4. The inward-facing brushless motor according to claim 2, characterized in that: It comprises a second bearing, wherein the second bearing is embedded in the mounting member and the second bearing is sleeved on the output shaft.

5. The inward-facing brushless motor according to claim 2, characterized in that: The mounting piece is provided with a mounting portion, a side portion of the mounting portion is provided with a protrusion, and a mounting hole is provided on the protrusion.

6. The inward-facing brushless motor according to claim 1, characterized in that: The cover block is provided with a central hole, a groove is provided in the central hole, the output shaft is provided with a convex block, the output shaft passes through the central hole, and the convex block is embedded in the groove.

7. The inward-facing brushless motor according to claim 1, characterized in that: A plurality of spacer blocks are arranged on the extension block, and permanent magnets are arranged between adjacent spacer blocks.

8. The inward-facing brushless motor according to claim 1, characterized in that: The cover block is provided with a heat dissipation hole, and the heat dissipation hole is communicated with the accommodating cavity.

9. A method for manufacturing an inward-facing motor, characterized in that: The following steps are involved: Take the output shaft and the cover block with the annular groove, press the output shaft into the cover block, so that the cover block is fixedly sleeved on the output shaft, and obtain the cover block with shaft; Take the housing provided with the accommodating cavity and the undercut, place the shaft cover block under the accommodating cavity, and then press the shaft cover block into the accommodating cavity from bottom to top until the undercut is embedded in the annular groove to obtain a semi-finished product; Take a permanent magnet, place the permanent magnet below the receiving cavity of the semi-finished product, and then press the permanent magnet into the receiving cavity from bottom to top until the permanent magnet abuts against the cover block; Take the stator, assemble the stator on the output shaft, and obtain an inward-facing motor.

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