CN115333299A - Hall circuit board seal structure and external rotor electric machine - Google Patents

Hall circuit board seal structure and external rotor electric machine Download PDF

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Publication number
CN115333299A
CN115333299A CN202211240002.9A CN202211240002A CN115333299A CN 115333299 A CN115333299 A CN 115333299A CN 202211240002 A CN202211240002 A CN 202211240002A CN 115333299 A CN115333299 A CN 115333299A
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CN
China
Prior art keywords
hall
circuit board
mounting
ring
cavity
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202211240002.9A
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Chinese (zh)
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CN115333299B (en
Inventor
陈志英
丁迎
周海军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Changzhou Xiangming Intelligent Power Co ltd
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Changzhou Xiangming Intelligent Power Co ltd
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Priority to CN202211240002.9A priority Critical patent/CN115333299B/en
Publication of CN115333299A publication Critical patent/CN115333299A/en
Application granted granted Critical
Publication of CN115333299B publication Critical patent/CN115333299B/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/21—Devices for sensing speed or position, or actuated thereby
    • H02K11/215—Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/10—Casings or enclosures characterised by the shape, form or construction thereof with arrangements for protection from ingress, e.g. water or fingers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
    • H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
    • H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/08—Arrangements for cooling or ventilating by gaseous cooling medium circulating wholly within the machine casing

Abstract

The invention relates to a Hall circuit board sealing structure and an outer rotor motor, wherein the Hall circuit board sealing structure comprises a Hall circuit board; the Hall circuit board comprises a PCB, and a Hall and an electronic element which are connected with each other through a circuit are formed on the PCB; meanwhile, the device also comprises an insulating bracket and a press-mounting plate; the insulating bracket is provided with a first accommodating cavity for accommodating an electronic element; a Hall cover plate is arranged on the press mounting plate; the Hall cover plate is provided with a second accommodating cavity for accommodating the Hall and covering the Hall; the Hall circuit board is clamped by the insulating support and the press-fitting plate to form a Hall integrated part; the Hall integrated part is arranged in the mounting cavity of the stator body; and sealing is formed in the mounting cavity by injecting a sealing glue. The outer rotor motor is provided with the Hall circuit board sealing structure. The Hall circuit board can be completely sealed, and the Hall circuit board can not be in direct contact with water in later use, so that the waterproof requirement is met.

Description

Hall circuit board seal structure and external rotor electric machine
Technical Field
The invention relates to the field of motors, in particular to a Hall circuit board sealing structure and an outer rotor motor.
Background
The hall element sensor is one of the rotor position sensors widely used at present, and has the advantages of light weight, small size, low manufacturing cost, convenience for mass production and the like, so that the hall element sensor is widely used in household products such as household appliances. In brushless dc motors, two main functions are achieved, one being to detect the position of the rotor by means of which the sequence of conduction of the electronically commutated (phase) drive lines is determined; the second is to determine the conduction angle of the power transistor in the driving circuit of the electronic commutation (phase) circuit, thereby determining the magnetic state of the armature magnetic field.
The design of a Hall element sensor in the existing motor relates to a Hall element sensor circuit board, wherein the Hall element sensor is close to a magnetic steel of a rotor assembly. However, in the existing external rotor motor, a certain air gap still exists between the external rotor assembly and the stator assembly, so that water vapor and condensation often exist on the hall circuit board, the hall circuit board is prone to aging, short circuit, corrosion and other problems, and the motor can stop running or the service life of the external rotor motor is influenced.
In some special environments, the requirement on the waterproof grade (more than or equal to IP54 electrified part) of the outer rotor motor is very high. One requirement is that the Hall circuit board can not have moisture and condensation absolutely. The existing sealing mode can not meet the waterproof requirement, so that a novel sealing structure for the Hall circuit board is continuously developed.
Disclosure of Invention
The first purpose of the invention is to provide a Hall circuit board sealing structure which can carry out overall sealing on the Hall circuit board, so that the waterproof grade is greatly improved.
The technical scheme for realizing the first purpose of the invention is as follows: the Hall circuit board sealing structure comprises a Hall circuit board; the Hall circuit board comprises a PCB, a Hall circuit and an electronic element, wherein the Hall circuit and the electronic element are in circuit connection on the PCB; meanwhile, the device also comprises an insulating bracket and a press-mounting plate; the insulating bracket is provided with a first accommodating cavity for accommodating an electronic element; a Hall cover plate is arranged on the press mounting plate; the Hall cover plate is provided with a second accommodating cavity for accommodating the Hall and covering the Hall; the Hall circuit board is clamped by the insulating bracket and the pressing plate to form a Hall integrated part; the Hall integrated part is arranged in the mounting cavity of the stator body; and sealing is formed in the mounting cavity by injecting a sealing glue.
Further, the insulating support is sheet-shaped; the press-mounting plate is annular; the Hall cover plate and the press-fitting plate are integrally arranged; a clamping block is arranged on the insulating bracket; the PCB is provided with a clamping groove which is correspondingly matched with the clamping block and used for fixing the PCB.
Furthermore, a plurality of first cushion blocks are arranged on the plane of the insulating support, which is opposite to the Hall circuit board; a plurality of second cushion blocks are arranged on the plane of the bottom surface of the insulating support positive installation cavity; a first filling space is formed between the PCB and the insulating bracket under the action of the first cushion block; a second filling space is formed between the insulating support and the mounting cavity under the action of the second cushion block; the Hall circuit board is lower than the side wall of the mounting cavity; a third filling space is formed between the Hall circuit board and the upper end of the side wall of the mounting cavity; and the first filling space, the second filling space and the third filling space are filled with sealing glue.
Furthermore, a plurality of through holes are formed in the PCB and the insulating support.
Furthermore, the edge of the inner side of the press-mounting plate is provided with an annular glue overflow prevention baffle. Still can set up on the inside wall of anti-overflow baffle and beat and glue the indicating line to the volume is beaten in control.
The second purpose of the invention is to provide an outer rotor motor adopting the Hall circuit board sealing structure, which has high waterproof grade and can ensure the normal operation of the Hall in special environment.
The technical scheme for realizing the second purpose of the invention is as follows: the outer rotor motor is provided with an outer rotor assembly, a stator assembly, a circuit board assembly and a rear cover; the stator assembly comprises a stator body fixedly provided with a stator winding; the outer rotor assembly comprises a rotor body fixedly provided with magnetic steel; the magnetic steel and the stator winding are coaxially arranged, and the magnetic steel is positioned outside the stator winding; the rotor body is rotationally connected to the stator body; meanwhile, the Hall circuit board sealing structure is also provided; the mounting cavity is positioned at one side close to the stator winding; a circuit installation cavity is formed in one side, far away from the stator winding, of the stator body; the circuit board assembly is fixedly arranged in the circuit mounting cavity; the rear cover is fixedly connected to the stator body and used for sealing the circuit installation cavity; the Hall circuit board is electrically connected with the circuit board assembly.
Further, the stator body comprises a hollow shaft body extending outwards from the center of the mounting cavity; the outer rotor assembly comprises a rotating shaft, a shaft sleeve, a fan bracket and a rotor body fixedly provided with magnetic steel; the rotating shaft is rotatably arranged in the hollow shaft body; the fan bracket is fixedly connected to one end, extending out from the hollow shaft body, of the rotating shaft through a shaft sleeve; the rotor body is fixedly connected with the fan bracket; and the fan bracket is provided with radiating fan blades circumferentially distributed along the rotation axis of the fan bracket.
Furthermore, a first labyrinth ring which is coaxial with the side wall of the mounting cavity is arranged on the outer side of the side wall of the mounting cavity on the stator body; the first labyrinth ring is lower than the side wall of the installation cavity; a ring groove is formed between the first labyrinth ring and the side wall of the mounting cavity; a plurality of hydrophobic gaps are distributed on the first labyrinth ring along the circumference of the axis of the first labyrinth ring; a lower end flange is fixedly arranged at one end of the rotor body close to the mounting cavity; a second labyrinth ring is fixedly arranged on the lower end flange; the second labyrinth ring is inserted into the ring groove and moves in the ring groove along with the rotation of the rotor body.
Further, the fan bracket comprises a central hub, a mounting ring and a positioning ring which are coaxially arranged from inside to outside in sequence; the central hub, the mounting ring and the positioning ring are connected into a whole through the radiating fan blades; the mounting ring is fixedly connected with the rotor body; the positioning ring is provided with a separating sheet for positioning the magnetic steel; the central hub is fixedly connected with the shaft sleeve.
Furthermore, a positioning mounting column is arranged on the mounting ring; the rotor body is provided with a countersunk through hole correspondingly matched with the positioning mounting column; the rotor body and the fan support are matched with the screw cap through the positioning mounting column inserted into the countersunk through hole to form fixed connection.
The invention has the positive effects that: (1) According to the invention, the Hall circuit board clamps the PCB through the insulating support and the press-fitting plate, and the Hall circuit board can be completely sealed by filling the sealant, so that the Hall circuit board cannot be damaged even if water flows in from between the outer rotor assembly and the stator assembly. Meanwhile, a Hall covering plate used for protecting the Hall is arranged on the press mounting plate, and the Hall covering plate can guarantee normal work of the Hall.
(2) According to the invention, the insulating bracket, the press-mounting plate and the PCB can form the Hall integrated part through the matching of the clamping groove and the clamping block, the clamping stability can not be ensured, and the later assembly is convenient.
(3) According to the invention, the first filling space and the second filling space can be formed through the first cushion block and the second cushion block, and then the third filling space is combined, so that the electronic elements and circuits on the PCB can be better wrapped and sealed by the sealant, and the sealing effect is further improved.
(4) The through hole is designed in the invention, the limitation of the fluidity of the sealant is considered, and the sealant can better flow and fill by additionally arranging the through hole.
(5) According to the invention, the glue overflow preventing baffle can prevent the sealant from overflowing when the part surrounded by the glue overflow preventing baffle is used for gluing.
(6) The outer rotor motor adopts the Hall circuit board sealing structure, so that the waterproof grade of the outer rotor motor can be further improved.
(7) The fan support is arranged, so that the rotor body can be connected, and the heat of the interior of the motor can be dissipated when the fan support rotates along with the rotor body.
(8) According to the invention, the arrangement of the first labyrinth ring and the second labyrinth ring can further improve the waterproof grade.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which
FIG. 1 is a schematic structural diagram of a Hall circuit board sealing structure in the invention;
FIG. 2 is a sectional view of the Hall circuit board sealing structure of the invention;
FIG. 3 is a schematic view of the structure of the insulating support of the present invention;
FIG. 4 is a bottom view of the insulating support of the present invention;
FIG. 5 is a schematic view of the press-fitting plate of the present invention;
FIG. 6 is a schematic structural view of a PCB board according to the present invention;
FIG. 7 is a schematic structural diagram of a Hall integrated part in the invention;
fig. 8 is a schematic structural view of an outer rotor motor according to the present invention;
fig. 9 is a sectional view of an outer rotor motor according to the present invention;
FIG. 10 is a schematic view of the structure of the stator body according to the present invention;
FIG. 11 is a schematic view of the stator assembly of the present invention assembled with a fan bracket;
FIG. 12 is a schematic view of a fan bracket according to the present invention;
FIG. 13 is a schematic structural view of a second labyrinth ring according to the present invention.
Detailed Description
Referring to fig. 1 to 7, the hall circuit board sealing structure of the invention comprises a hall circuit board; the Hall circuit board comprises a PCB (printed Circuit Board) 1, and a Hall and an electronic element which are connected with each other through a circuit and formed on the PCB 1; meanwhile, the device also comprises an insulating bracket 2 and a press mounting plate 3; a first accommodating cavity 21 for accommodating electronic components is arranged on the insulating bracket 2; the press-mounting plate 3 is provided with a Hall cover plate 31; the Hall cover plate 31 is provided with a second accommodating cavity 32 for accommodating a Hall and covering the Hall; the Hall circuit board is clamped by the insulating bracket 2 and the press-mounting plate 3 to form a Hall integrated piece; the Hall integrated part is arranged in the mounting cavity 41 of the stator body 4; and sealing is formed in the installation cavity 41 by injecting sealing glue.
The insulating bracket 2 is in a circular sheet shape; the press-mounting plate 3 is annular; the Hall cover plate 31 and the press mounting plate 3 are integrally arranged, namely integrally formed; a clamping block 22 is arranged on the insulating bracket 2; the PCB board 1 is provided with a clamping groove 11 which is correspondingly matched with the clamping block 22 and used for fixing the PCB board 1.
A plurality of first cushion blocks 23 which are uniformly distributed along the central axis of the insulating support 2 in a circumferential manner are arranged on the plane of the insulating support 2, which is opposite to the Hall circuit board; a plurality of second cushion blocks 24 which are uniformly distributed along the central axis of the insulating bracket 2 in a circumferential manner are arranged on the plane of the bottom surface of the positive installation cavity 41 of the insulating bracket 2; a first filling space is formed between the PCB 1 and the insulating bracket 2 under the action of the first cushion block 23; a second filling space is formed between the insulating bracket 2 and the mounting cavity 41 under the action of the second cushion block 24; the Hall circuit board is lower than the side wall of the mounting cavity 41; and an annular anti-overflow rubber baffle 33 is arranged at the edge of the inner side of the press-mounting plate 3. If manual gluing is carried out, gluing indicating lines can be arranged on the inner side wall of the anti-overflow glue baffle 33 so as to control the gluing amount. A third filling space is formed between the Hall circuit board and the upper end of the side wall of the mounting cavity 41; and the first filling space, the second filling space and the third filling space are filled with sealant 5.
In order to facilitate the flowing filling of the sealant 5 among the first filling space, the second filling space and the third filling space, a plurality of through holes 6 are formed in the PCB 1 and the insulating support 2.
Referring to fig. 8 to 13, the outer rotor motor of the present invention has an outer rotor assembly 7, a stator assembly, a circuit board assembly 8 and a rear cover 9; the stator assembly comprises a stator body 4 fixedly provided with a stator winding; the outer rotor assembly 7 comprises a rotor body 71 fixedly provided with magnetic steel; the magnetic steel and the stator winding are coaxially arranged, and the magnetic steel is positioned outside the stator winding; the rotor body 71 is rotatably connected to the stator body 4; meanwhile, the Hall circuit board sealing structure is also provided; the mounting cavity 41 is positioned at one side close to the stator winding; a circuit installation cavity 42 is formed in one side, far away from the stator winding, of the stator body 4; the circuit board assembly 8 is fixedly arranged in the circuit mounting cavity 42; the rear cover 9 is fixedly connected to the stator body 4 and is used for sealing the circuit installation cavity 42.
Wherein, the bottom of the first chamber 21 on the insulating support 2 is provided with an outgoing line through hole 211, and the outgoing line through hole 211 is used for the outgoing line of the Hall circuit board to penetrate out. The specific structure can be seen in fig. 3.
In order to match the design, the stator body 4 needs to be provided with a through hole 43 for the first accommodating cavity 21 to be embedded; when the first cavity 21 is inserted into the through hole 43 of the stator body 4, the through hole 43 is just sealed. And the through hole 43 of the stator body 4 is communicated with the mounting cavity 41 and the circuit mounting cavity 42. When the outgoing line of the hall circuit board passes through the outgoing line through hole 211, the outgoing line enters the circuit installation cavity 42 and is electrically connected with the circuit board assembly 8.
The stator body 4 comprises a hollow shaft body 44 extending outwards from the center of the mounting cavity 41; the outer rotor assembly 7 comprises a rotating shaft 72, a shaft sleeve 73, a fan bracket 74 and a rotor body 71 fixedly provided with magnetic steel; the rotating shaft 72 is rotatably arranged in the hollow shaft body 44; the fan bracket 74 is fixedly connected to one end of the rotating shaft 72 extending out of the hollow shaft body 44 through a shaft sleeve 73; the rotor body 71 is fixedly connected to a fan bracket 74.
The fan bracket 74 comprises a central hub 741, a mounting ring 742 and a positioning ring 743 which are coaxially arranged from inside to outside in sequence; the central hub 741, the mounting ring 742 and the positioning ring 743 are connected into a whole through the heat dissipation fan blades 744; the heat dissipating fan blades 744 are uniformly distributed along the circumference of the rotation axis of the fan bracket 74, and the heat dissipating fan blades 744 radially extend outwards from the rotation center; the mounting ring 742 is fixedly connected with the rotor body 71; a separating sheet 743-1 for positioning the magnetic steel is arranged on the positioning ring 743; the central hub 741 is fixedly connected to the sleeve 73.
A positioning mounting column 742-1 is arranged on the mounting ring 742; the rotor body 71 is provided with a countersunk through hole correspondingly matched with the positioning mounting column 742-1; the rotor body 71 and the fan bracket 74 are fixedly connected through the positioning mounting column 742-1 inserted into the countersunk through hole and the nut.
A first labyrinth ring 45 which is coaxial with the side wall of the mounting cavity 41 is arranged on the outer side of the side wall of the mounting cavity 41 on the stator body 4; the first labyrinth ring 45 is lower than the side wall of the mounting cavity 41; a ring groove is formed between the first labyrinth ring 45 and the side wall of the mounting cavity 41; a plurality of hydrophobic gaps 451 are distributed on the first labyrinth ring 45 along the circumference of the axis thereof; a lower end flange 711 is fixedly arranged at one end of the rotor body 71 close to the mounting cavity 41; a second labyrinth ring 712 is fixedly arranged on the lower end flange 711; the second labyrinth ring 712 is inserted into the ring grooves and moves within the ring grooves with the rotation of the rotor body 71.
The assembly process of the structure of the invention is as follows:
firstly, assembling the Hall integrated parts: the PCB 1 provided with the Hall and the electronic element is fixedly connected with the insulating bracket 2 through the matching of the clamping groove 11 and the clamping block 22; and then the hall cover plate 31 on the press-mounting plate 3 is covered on the hall on the PCB board 1, thereby forming the hall assembly.
Then, the hall integrated part is installed in the installation cavity 41 of the stator body 4, and the first accommodating cavity 21 on the insulating support 2 needs to be embedded into the corresponding through hole 43 on the stator body 4 during installation.
The through hole of the outgoing line of the first cavity 21 is blocked, and then the glue is applied by the glue applying needle in the range surrounded by the anti-overflow glue baffle 33 until the first filling space, the second filling space and the second filling space are all filled with the surface sealant 5.
After the sealant 5 is solidified, the stator body 4 and the Hall circuit board form an integrated piece, and the Hall circuit board is completely wrapped by the sealant at the moment, even if the Hall is also protected by the Hall cover plate 31 for sealing.
Then, the stator winding assembly, the assembly circuit board assembly 8 of the outer rotor assembly 7 and the rear cover 9 are assembled according to the normal installation procedure of the outer rotor motor.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A Hall circuit board sealing structure comprises a Hall circuit board; the Hall circuit board comprises a PCB, a Hall circuit and an electronic element, wherein the Hall circuit and the electronic element are in circuit connection on the PCB; the method is characterized in that: the device also comprises an insulating bracket and a press-mounting plate; the insulating bracket is provided with a first accommodating cavity for accommodating an electronic element; a Hall cover plate is arranged on the press mounting plate; the Hall cover plate is provided with a second accommodating cavity for accommodating the Hall and covering the Hall; the Hall circuit board is clamped by the insulating support and the press-fitting plate to form a Hall integrated part; the Hall integrated piece is arranged in the mounting cavity of the stator body; and sealing is formed in the mounting cavity by injecting a sealing glue.
2. The hall circuit board sealing structure of claim 1, wherein: the insulating bracket is in a sheet shape; the press-mounting plate is annular; the Hall cover plate and the press-fitting plate are integrally arranged; a clamping block is arranged on the insulating bracket; the PCB is provided with a clamping groove which is correspondingly matched with the clamping block and used for fixing the PCB.
3. The hall circuit board sealing structure of claim 2, wherein: a plurality of first cushion blocks are arranged on the plane of the insulating bracket, which is opposite to the Hall circuit board; a plurality of second cushion blocks are arranged on the plane of the bottom surface of the insulating support positive installation cavity; a first filling space is formed between the PCB and the insulating bracket under the action of the first cushion block; a second filling space is formed between the insulating support and the mounting cavity under the action of the second cushion block; the Hall circuit board is lower than the side wall of the mounting cavity; a third filling space is formed between the Hall circuit board and the upper end of the side wall of the mounting cavity; and the first filling space, the second filling space and the third filling space are filled with sealing glue.
4. The hall wiring board sealing structure of claim 1, wherein: and a plurality of through holes are formed in the PCB and the insulating support.
5. The hall circuit board sealing structure of claim 3, wherein: and an annular anti-overflow glue baffle is arranged at the edge of the inner side of the press-mounting plate.
6. An outer rotor motor is provided with an outer rotor assembly, a stator assembly, a circuit board assembly and a rear cover; the stator assembly comprises a stator body fixedly provided with a stator winding; the outer rotor assembly comprises a rotor body fixedly provided with magnetic steel; the magnetic steel and the stator winding are coaxially arranged, and the magnetic steel is positioned outside the stator winding; the rotor body is rotationally connected to the stator body; the method is characterized in that: a Hall circuit board sealing structure having the structure of claim 1 or 2 or 3 or 4 or 5; the mounting cavity is positioned at one side close to the stator winding; a circuit installation cavity is arranged on one side of the stator body, which is far away from the stator winding; the circuit board assembly is fixedly arranged in the circuit mounting cavity; the rear cover is fixedly connected to the stator body and used for sealing the circuit installation cavity; the Hall circuit board is electrically connected with the circuit board assembly.
7. The external rotor electric machine according to claim 6, wherein: the stator body comprises a hollow shaft body extending outwards from the center of the mounting cavity; the outer rotor assembly comprises a rotating shaft, a shaft sleeve, a fan bracket and a rotor body fixedly provided with magnetic steel; the rotating shaft is rotatably arranged in the hollow shaft body; the fan bracket is fixedly connected to one end, extending out from the hollow shaft body, of the rotating shaft through a shaft sleeve; the rotor body is fixedly connected with the fan bracket; and the fan bracket is provided with radiating fan blades circumferentially distributed along the rotation axis of the fan bracket.
8. The external rotor electric machine according to claim 6, wherein: a first labyrinth ring which is coaxial with the side wall of the mounting cavity is arranged on the outer side of the side wall of the mounting cavity on the stator body; the first labyrinth ring is lower than the side wall of the installation cavity; a ring groove is formed between the first labyrinth ring and the side wall of the mounting cavity; a plurality of hydrophobic gaps are distributed on the first labyrinth ring along the circumference of the axis of the first labyrinth ring; a lower end flange is fixedly arranged at one end of the rotor body close to the mounting cavity; a second labyrinth ring is fixedly arranged on the lower end flange; the second labyrinth ring is inserted into the ring groove and moves in the ring groove along with the rotation of the rotor body.
9. The external rotor electric machine according to claim 7, wherein: the fan bracket comprises a central hub, a mounting ring and a positioning ring which are coaxially arranged from inside to outside in sequence; the central hub, the mounting ring and the positioning ring are connected into a whole through the radiating fan blades; the mounting ring is fixedly connected with the rotor body; the positioning ring is provided with a separating sheet for positioning the magnetic steel; the central hub is fixedly connected with the shaft sleeve.
10. The external rotor electric machine according to claim 9, wherein: the mounting ring is provided with a positioning mounting column; the rotor body is provided with a countersunk through hole correspondingly matched with the positioning mounting column; the rotor body and the fan support are matched with the screw cap through the positioning mounting column inserted into the countersunk through hole to form fixed connection.
CN202211240002.9A 2022-10-11 2022-10-11 Hall circuit board seal structure and external rotor electric machine Active CN115333299B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211240002.9A CN115333299B (en) 2022-10-11 2022-10-11 Hall circuit board seal structure and external rotor electric machine

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Application Number Priority Date Filing Date Title
CN202211240002.9A CN115333299B (en) 2022-10-11 2022-10-11 Hall circuit board seal structure and external rotor electric machine

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CN115333299A true CN115333299A (en) 2022-11-11
CN115333299B CN115333299B (en) 2022-12-23

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203014634U (en) * 2012-11-20 2013-06-19 砀山县帝佑车业有限公司 External Hall device of brushless motor for electric car
CN103248172A (en) * 2012-09-02 2013-08-14 朱卫国 Driving motor for vehicle
CN203840142U (en) * 2014-04-30 2014-09-17 中山大洋电机股份有限公司 Plastic packaging electric machine
CN204030868U (en) * 2014-07-30 2014-12-17 中山大洋电机股份有限公司 The motor of a kind of Hall element hermetically-sealed construction and application thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103248172A (en) * 2012-09-02 2013-08-14 朱卫国 Driving motor for vehicle
CN203014634U (en) * 2012-11-20 2013-06-19 砀山县帝佑车业有限公司 External Hall device of brushless motor for electric car
CN203840142U (en) * 2014-04-30 2014-09-17 中山大洋电机股份有限公司 Plastic packaging electric machine
CN204030868U (en) * 2014-07-30 2014-12-17 中山大洋电机股份有限公司 The motor of a kind of Hall element hermetically-sealed construction and application thereof

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