A brushless DC motor

Abstract

The present invention discloses a brushless DC motor, comprising: a housing with a motor shaft built in; a rotor located in the housing and fastened on the motor shaft; a stator fastened in the housing and located on the periphery of the rotor, comprising an outer stator fastened on the inner wall of the housing, an inner stator fastened in a receiving hole of the outer stator, and a winding wound on the inner stator, wherein an axial hole is formed on the inner stator; a circuit board located in the housing and detachably arranged on the rear end of the inner stator, wherein a center hole for the motor shaft to pass through is formed on the circuit board, and a Hall element is arranged on the circuit board; a second magnetic ring located in the housing and fastened on the motor shaft; wherein a plug hole is provided on the rear end of the inner stator, and a connecting plug matched with the plug hole is provided on the circuit board. The brushless DC motor has the advantages of compact structure and convenient installation.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a brushless DC motor. Background Art

[0002] The brushless DC motor on the market currently includes a housing, a stator, a rotor and a circuit board. The housing includes a tubular body, a rear end cover and a front end cover. The circuit board is arranged on the inner side wall of the rear end cover through a mounting frame. The rear end cover is connected and covered on the rear end of the body through screws. The defects are: the circuit board needs to be arranged inside the tubular body through a mounting frame, the structure is complicated and the installation is inconvenient. Therefore, it is necessary to study a brushless DC motor. Summary of the invention

[0003] In view of the deficiencies existing in the above technologies, the present invention provides a brushless DC motor with compact structure and convenient installation.

[0004] The technical solution adopted by the present invention to solve the technical problem is: a brushless DC motor, comprising: a housing with a motor shaft built in; a rotor located in the housing and fastened on the motor shaft; a stator fastened in the housing and located on the periphery of the rotor, comprising an outer stator fastened on the inner wall of the housing, an inner stator fastened in a receiving hole of the outer stator, and a winding wound on the inner stator, wherein an axial hole is formed on the inner stator, and the rotor is located in the axial hole; a circuit board located in the housing and detachably arranged on the rear end of the inner stator, wherein a center hole for the motor shaft to pass through is formed on the circuit board, and a Hall element is arranged on the circuit board; a second magnetic ring located in the housing and fastened on the motor shaft, which is located between the rotor and the circuit board, and the outer circumferential wall of the second magnetic ring is arranged opposite to the Hall element; wherein a plug hole is opened on the rear end of the inner stator, and a connecting plug matched with the plug hole is arranged on the circuit board, and the circuit board is detachably arranged on the inner stator through the connecting plug.

[0005] Preferably, the housing includes a main housing with a hollow interior, a front end cover and a rear end cover which are detachably arranged on two opposite ends of the main housing for fixing and supporting the motor shaft.

[0006] Preferably, the inner stator includes a main support body, a front connecting ring fastened to the front end portion of the main support body, and a rear connecting ring fastened to the rear end portion of the main support body, wherein a plurality of first connecting columns are formed on the rear end face of the front connecting ring, a first connecting hole corresponding to the first connecting columns is formed on the front end portion of the main support body, a plurality of second connecting columns are formed on the front end face of the rear connecting ring, a second connecting hole corresponding to the second connecting column is formed on the rear end portion of the main support body, a plurality of protrusions are formed on the rear end face of the rear connecting ring, and the jack is formed on the rear end face of the protrusions.

[0007] Preferably, the main support body includes a main annular cylinder formed with the axial hole, and a plurality of long strip-shaped main T-shaped blocks arranged along its busbar direction for winding coils are evenly distributed on the outer circumferential wall of the main annular cylinder, and a plurality of long strip-shaped main I-shaped blocks arranged along its busbar direction for separating coils are also evenly distributed on the outer circumferential wall of the main annular cylinder, wherein the main T-shaped blocks and the main I-shaped blocks are distributed alternately, and a coil groove is formed between adjacent main T-shaped blocks and main I-shaped blocks; the front connecting ring includes a front annular cylinder formed with the axial hole A cylinder, a plurality of front T-blocks corresponding to the main T-block and a plurality of front I-blocks corresponding to the main I-block are evenly distributed on the outer circumferential wall of the front annular cylinder, and the first connecting column is formed on the front T-block; the rear connecting ring includes a rear annular cylinder formed with the axial hole, a plurality of rear T-blocks corresponding to the main T-block and a plurality of rear I-blocks corresponding to the main I-block are evenly distributed on the outer circumferential wall of the rear annular cylinder, and the second connecting column and the protrusion are respectively formed on the opposite sides of the rear T-block.

[0008] Preferably, insulating paper is provided in the coil slot.

[0009] Preferably, it further comprises an insulating ring located in the shell, the insulating ring being sleeved on the periphery of the circuit board, wherein a fastening block for tightening the insulating ring on the periphery of the circuit board is fixedly provided on the side wall of the protrusion.

[0010] Preferably, the second magnetic ring is fastened to the motor shaft via a copper sleeve.

[0011] Preferably, the rotor comprises a columnar silicon steel piece fastened to the motor shaft, and a first magnetic ring fastened to the outer circumferential wall of the silicon steel piece, wherein the first magnetic ring is fastened to the silicon steel piece by glue.

[0012] Preferably, the connecting plug includes a plug body, a plug block inserted into the circuit board is formed on one end of the plug body, and a V-shaped groove is formed on the other end opposite to the plug body so that the plug body can obtain a pair of pins that can be inserted into the socket, wherein a round hole is formed on the circuit board for the plug block to be inserted.

[0013] Compared with the prior art, the present invention has the following beneficial effects: a DC brushless motor provided by the present invention has a jack on the rear end of its inner stator, a connecting plug matched with the jack is provided on the circuit board, and the circuit board is detachably arranged on the inner stator through the connecting plug, which has the advantages of simple and compact structure and convenient installation; the stator adopts a combination of an outer stator and an inner stator, which has the advantage of convenient installation; the inner stator includes a main bracket body, a front connecting ring, and a rear connecting ring, the front connecting ring is fastened to the main bracket body through a first connecting column, and the rear connecting ring is fastened to the main bracket body through a second connecting column, which has the advantages of simple structure and convenient connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a structural schematic diagram of the brushless DC motor of the present invention;

[0015] Figure 2 It is a schematic diagram of the exploded structure of the brushless DC motor of the present invention;

[0016] Figure 3 is a schematic diagram of the exploded structure of the stator of the present invention;

[0017] Figure 4 is a schematic diagram of the exploded structure of the rotor of the present invention;

[0018] Figure 5 It is a schematic diagram of the structure of the circuit board of the present invention;

[0019] Figure 6 is a schematic diagram of the positional relationship between the second magnetic ring and the Hall element of the present invention;

[0020] Figure 7 It is a structural schematic diagram of the connecting plug of the present invention;

[0021] Figure 8 It is a schematic structural diagram of the inner stator of the present invention;

[0022] Fig. 9 is a schematic diagram of the exploded structure of the inner stator of the present invention;

[0023] Fig.10 It is a schematic diagram of the positional relationship between the insulating paper and the main support body of the present invention;

[0024] Fig.11 It is a schematic diagram of the positional relationship between the insulating paper and the winding of the present invention;

[0025] Fig.12 It is a schematic structural diagram of a silicon steel part of the present invention;

[0026] Fig.13 It is a structural schematic diagram of the rear end cover of the present invention.

[0027] In the figure: 10, main housing; 11, front cover; 12, rear cover; 13, motor shaft; 20, stator; 21, outer stator; 211, accommodating hole; 22, inner stator; 221, main bracket body; 222, front connecting ring; 223, rear connecting ring; 224, protrusion; 225, jack; 226, first connecting column; 227, second connecting column; 228, main T-block; 229, main I-block; 23. Winding; 30. Rotor; 31. Silicon steel part; 311. Elongated slot; 32. First magnetic ring; 40. Copper sleeve; 50. Second magnetic ring; 60. Circuit board; 62. Hall element; 63. Connecting plug; 631. Plug body; 632. Plug block; 633. V-groove; 70. Insulating paper; 80. Insulating ring; 81. Fastening block; 90. Corrugated gasket; 91. Gasket; 92. Cable clamp. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0029] like Figures 1 to 13 As shown, the present invention provides a brushless DC motor, comprising: a housing with a motor shaft 13 built in; a rotor 30 located in the housing and fastened to the motor shaft 13; a stator 20 fastened in the housing and located outside the rotor 30, as shown in FIG. Figure 3 As shown, it comprises an outer stator 21 fastened to the inner wall of the housing, an inner stator 22 fastened in a receiving hole 211 of the outer stator 21, a winding 23 wound on the inner stator 22, an axial hole formed on the inner stator 22, and the rotor 30 is located in the axial hole; a circuit board 60 located in the housing and detachably arranged on the rear end of the inner stator 22, as shown in FIG. Figure 3 and Figure 5 As shown, the circuit board 60 is formed with a central hole for the motor shaft 13 to pass through, and the circuit board 60 is provided with a Hall element 62; the second magnetic ring 50 is located in the housing and fastened to the motor shaft 13, as shown in FIG. Figure 4 and Figure 6 As shown, it is located between the rotor 30 and the circuit board 60, and the outer circumferential wall of the second magnetic ring 50 is arranged facing the Hall element 62; wherein, as Figure 5 , Figure 6 and Fig. 9As shown, a plug hole 225 is provided on the rear end of the inner stator 22 , and a connecting plug 63 matching with the plug hole 225 is provided on the circuit board 60 . The circuit board 60 is detachably arranged on the inner stator 22 through the connecting plug 63 .

[0030] As an embodiment of this solution, Figure 1 As shown, the housing includes a main housing 10 with a hollow interior, a front cover 11 and a rear cover 12 detachably arranged on opposite ends of the main housing 10 for fixing and supporting the motor shaft 13 .

[0031] As an embodiment of this solution, Figure 4 As shown, the motor shaft 13 is arranged on the front cover 11 and the rear cover 12 through bearings, wherein the rear cover 12 is formed with a bearing hole for accommodating the bearing, and a corrugated gasket 90 is arranged between the bearing and the end of the bearing hole. The corrugated gasket 90 has the function of adjusting the axial clearance, and a gasket 91 is also arranged between the corrugated gasket 90 and the end of the bearing hole.

[0032] As an embodiment of this solution, Fig.13 As shown, an inverted U-shaped hole is formed at the bottom of the rear end cover 12, and a cable hoop 92 is built into the U-shaped hole.

[0033] As an embodiment of this solution, Figure 8 and Fig. 9 As shown, the inner stator 22 includes a main support body 221, a front connecting ring 222 fastened to the front end of the main support body 221, and a rear connecting ring 223 fastened to the rear end of the main support body 221, wherein a plurality of first connecting columns 226 are formed on the rear end face of the front connecting ring 222, a first connecting hole corresponding to the first connecting columns 226 is formed on the front end of the main support body 221, a plurality of second connecting columns 227 are formed on the front end face of the rear connecting ring 223, a second connecting hole corresponding to the second connecting column 227 is formed on the rear end of the main support body 221, a plurality of protrusions 224 are formed on the rear end face of the rear connecting ring 223, and the jack 225 is formed on the rear end face of the protrusion 224.

[0034] As an embodiment of this solution, Figure 8 and Fig. 9As shown, the main support body 221 includes a main annular cylinder formed with the axial hole, and a plurality of long strip-shaped main T-shaped blocks 228 arranged along its busbar direction for winding coils are evenly distributed on the outer circumferential wall of the main annular cylinder. A plurality of long strip-shaped main I-shaped blocks 229 arranged along its busbar direction for separating coils are also evenly distributed on the outer circumferential wall of the main annular cylinder, wherein the main T-shaped blocks 228 and the main I-shaped blocks 229 are distributed alternately, and a coil slot is formed between adjacent main T-shaped blocks 228 and main I-shaped blocks; the front connecting ring 222 includes a front annular cylinder formed with the axial hole , a plurality of front T-blocks corresponding to the main T-block 228 and a plurality of front I-blocks corresponding to the main I-block 229 are evenly distributed on the outer circumferential wall of the front annular cylinder, and the first connecting column 226 is formed on the front T-block; the rear connecting ring 223 includes a rear annular cylinder formed with the axial hole, and a plurality of rear T-blocks corresponding to the main T-block 228 and a plurality of rear I-blocks corresponding to the main I-block 229 are evenly distributed on the outer circumferential wall of the rear annular cylinder, and the second connecting column 227 and the protrusion 224 are respectively formed on the opposite sides of the rear T-block.

[0035] As an embodiment of this solution, Fig.10 and Fig.11 As shown, an insulating paper 70 is arranged in the coil slot, and the insulating paper 70 is wrapped on the coil.

[0036] As an embodiment of this solution, Figure 2 and Fig. 9 As shown, it also includes an insulating ring 80 located in the shell, and the insulating ring 80 is sleeved on the periphery of the circuit board 60, wherein a fastening block 81 for tightening the insulating ring 80 on the periphery of the circuit board 60 is fixedly provided on the side wall of the protrusion 224.

[0037] As an embodiment of this solution, Figure 3 , Figure 4 and Figure 6 As shown, the second magnetic ring 50 is fastened to the motor shaft 13 via a copper sleeve 40 .

[0038] As an embodiment of this solution, Figure 3 , Figure 4 and Fig.12As shown, the rotor 30 includes a columnar silicon steel part 31 fastened to the motor shaft 13, and a first magnetic ring 32 fastened to the outer circumferential wall of the silicon steel part 31, wherein the first magnetic ring 32 is fastened to the silicon steel part 31 by glue; in this embodiment, the silicon steel part 31 is formed by stacking a plurality of silicon steel sheets, and a plurality of axially distributed elongated grooves 311 are formed on the outer circumferential wall of the silicon steel part 31, and the elongated grooves 311 can eliminate the imbalance of the silicon steel sheet stack to facilitate dynamic balancing.

[0039] As an embodiment of this solution, Figure 7 As shown, the connecting plug 63 includes a plug body 631, one end of which is formed with a plug block 632 inserted into the circuit board 60, and the other end opposite to it is provided with a V-shaped groove 633 so that the plug body 631 can obtain a pair of pins that can be inserted into the socket 225, wherein a round hole is provided on the circuit board 60 for the plug block 632 to be inserted, and the plug block 632 is fastened in the round hole.

[0040] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A brushless DC motor, characterized in that: include: A housing having a motor shaft (13) built therein; a rotor (30) located in the housing and fastened to the motor shaft (13); A stator (20) fastened in the housing and located outside the rotor (30), comprising an outer stator (21) fastened to the inner wall of the housing, an inner stator (22) fastened in a receiving hole (211) of the outer stator (21), and a winding (23) wound on the inner stator (22); an axial hole is formed on the inner stator (22), and the rotor (30) is located in the axial hole; a circuit board (60) located in the housing and detachably arranged on the rear end of the inner stator (22), the circuit board (60) being formed with a central hole for the motor shaft (13) to pass through, and a Hall element (62) being arranged on the circuit board (60); a second magnetic ring (50) located in the housing and fastened to the motor shaft (13), which is located between the rotor (30) and the circuit board (60), and the outer circumferential wall of the second magnetic ring (50) is arranged facing the Hall element (62); A plug hole (225) is provided on the rear end of the inner stator (22), a connecting plug (63) matching with the plug hole (225) is provided on the circuit board (60), and the circuit board (60) is detachably arranged on the inner stator (22) via the connecting plug (63); The inner stator (22) comprises a main support body (221), a front connecting ring (222) fastened to the front end of the main support body (221), and a rear connecting ring (223) fastened to the rear end of the main support body (221), wherein a plurality of first connecting columns (226) are formed on the rear end face of the front connecting ring (222), a first connecting hole corresponding to the first connecting columns (226) is formed on the front end of the main support body (221), a plurality of second connecting columns (227) are formed on the front end face of the rear connecting ring (223), a second connecting hole corresponding to the second connecting columns (227) is formed on the rear end of the main support body (221), a plurality of protrusions (224) are formed on the rear end face of the rear connecting ring (223), and the insertion hole (225) is formed on the rear end face of the protrusion (224); The main support body (221) comprises a main annular cylinder formed with the axial hole, and a plurality of long strip-shaped main T-shaped blocks (228) arranged along the busbar direction for winding coils are evenly distributed on the outer circumferential wall of the main annular cylinder, and a plurality of long strip-shaped main I-shaped blocks (229) arranged along the busbar direction for separating coils are also evenly distributed on the outer circumferential wall of the main annular cylinder, wherein the main T-shaped blocks (228) and the main I-shaped blocks (229) are distributed alternately, and a coil slot is formed between adjacent main T-shaped blocks (228) and main I-shaped blocks; the front connecting ring (222) comprises a front annular cylinder formed with the axial hole, and the A plurality of front T-shaped blocks corresponding to the main T-shaped blocks (228) and a plurality of front I-shaped blocks corresponding to the main I-shaped blocks (229) are evenly distributed on the outer circumferential wall surface of the front annular cylinder, and the first connecting column (226) is formed on the front T-shaped block; the rear connecting ring (223) comprises a rear annular cylinder formed with the axial hole, and a plurality of rear T-shaped blocks corresponding to the main T-shaped blocks (228) and a plurality of rear I-shaped blocks corresponding to the main I-shaped blocks (229) are evenly distributed on the outer circumferential wall surface of the rear annular cylinder, and the second connecting column (227) and the protrusion (224) are respectively formed on the opposite sides of the rear T-shaped block; The second magnetic ring (50) is fastened to the motor shaft (13) via a copper sleeve (40).

2. The brushless DC motor according to claim 1, characterized in that: The housing comprises a main housing (10) with a hollow interior, a front cover (11) and a rear cover (12) detachably arranged on opposite ends of the main housing (10) for fixing and supporting the motor shaft (13).

3. The brushless DC motor according to claim 1, characterized in that: Insulating paper (70) is arranged in the coil slot.

4. The brushless DC motor according to claim 1, characterized in that: It also includes an insulating ring (80) located in the shell, the insulating ring (80) being sleeved around the periphery of the circuit board (60), wherein a fastening block (81) for tightening the insulating ring (80) around the periphery of the circuit board (60) is fixedly arranged on the side wall of the protrusion (224).

5. The brushless DC motor according to claim 1, characterized in that: The rotor (30) comprises a columnar silicon steel part (31) fastened to the motor shaft (13), and a first magnetic ring (32) fastened to the outer circumferential wall of the silicon steel part (31), wherein the first magnetic ring (32) is fastened to the silicon steel part (31) by glue.

6. The brushless DC motor according to claim 1, characterized in that: The connecting plug (63) comprises a plug body (631), one end of which is formed with a plug block (632) inserted into the circuit board (60), and the other end facing the plug body is provided with a V-shaped groove (633) so that the plug body (631) can obtain a pair of pins that can be inserted into the socket (225), wherein the circuit board (60) is provided with a round hole for the plug block (632) to be inserted.

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