CN210225189U - Brushless motor - Google Patents

Abstract

The utility model discloses a brushless motor, brushless motor includes: the support is provided with a matching convex column on one side; a rotor assembly including a rotating shaft extending into the mating boss; the stator assembly comprises a stator core, a coil winding and an electric connecting piece, the stator core is sleeved on the matching convex column, the coil winding is wound on the stator core, an insulating layer is arranged between the coil winding and the stator core, and the electric connecting piece is electrically connected with the coil winding; the circuit board is fixed on the other side of the support, and the electric connecting piece is electrically connected with the circuit board. According to the utility model discloses brushless motor has made things convenient for the heat dissipation of circuit board, has promoted brushless motor's life and security, has also simplified brushless motor's structure, is favorable to improving brushless motor's production efficiency.

Description

Brushless motor

Technical Field

The utility model relates to the technical field of motors, concretely relates to brushless motor.

Background

In the related art, a brushless motor includes a stator, a rotor, a circuit board, a substrate holding member, a motor housing, and a housing cover portion. The substrate holding member includes a substrate mounting portion for mounting the circuit board, and a lead holding portion for holding a lead extending from the circuit board; the lead holding portion is disposed in the notch portion of the motor case and guides the lead on the circuit board out of the motor case. The stator core has a slit formed in its outer periphery and the motor housing, and the substrate holding member has a projection extending therein for positioning the circuit board together with the lead holder. The substrate holding member has a plurality of protrusions in the direction of the housing cover, and has elasticity to abut against the housing cover, thereby enhancing the firmness of fixing the substrate holding member.

The brushless motor in the related art only uses one bearing, the matching surface of the brushless motor and the shaft is long, the other end of the shaft is abutted to the thrust plate, and the rotating resistance of the shaft is large. In addition, the wire is flexible, the assembly difficulty between the wire protection part and the wire is high, the wire protection part and the wire are required to be matched with a circuit board for welding, and the installation efficiency is low. And the circuit board is arranged in the middle of the shell, the contact area with the outer shell is small, and the heat dissipation is insufficient.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least.

Therefore, the utility model provides a brushless motor, this brushless motor's radiating effect is better.

According to the utility model discloses brushless motor, include: the support is provided with a matching convex column on one side; the first end of the rotating shaft extends out of the machine shell, and the rotating shaft extends into the matching convex column; the stator assembly comprises a stator core, a coil winding and an electric connecting piece, the stator assembly is arranged in the shell, the stator core is sleeved on the matching convex column, the coil winding is wound on the stator core, an insulating layer is arranged between the coil winding and the stator core, and the electric connecting piece is electrically connected with the coil winding; the circuit board is fixed on the other side of the support, and the electric connecting piece is electrically connected with the circuit board.

According to the utility model discloses brushless motor is through setting up the support to locate one side of support with rotor subassembly and stator module, the opposite side of support is located to the circuit board, has made things convenient for the heat dissipation of circuit board, has promoted brushless motor's life and security, has also simplified brushless motor's structure, is favorable to improving brushless motor's production efficiency.

According to some embodiments of the present invention, the bracket is provided with an isolation hole, and the electrical connector passes through the isolation hole to be electrically connected to the circuit board.

According to some embodiments of the utility model, the isolation hole intussuseption is filled with sealed stifled, electric connector passes sealed stifled.

According to some embodiments of the present invention, the electrical connector comprises a terminal base body and a hook, the hook is provided on the terminal base body, the enameled wire of the coil winding is hung on the hook.

According to some embodiments of the invention, the circuit board with be equipped with the heat-conducting layer between the support.

According to some embodiments of the utility model, be equipped with the orientation on the support the supporting shoe that stator core extends, the supporting shoe ends to stator core and/or on the insulating layer.

According to some embodiments of the utility model, be equipped with the bearing that a plurality of intervals set up in the cooperation projection, every the bearing overcoat is in on the rotation axis, brushless motor still includes the setting element, the setting element includes retaining ring and elastic component, the retaining ring with the elastic component is followed the length direction interval of rotation axis sets up, the retaining ring ends and is in the tip of the second end of rotation axis, the both ends of elastic component respectively with one of them bearing with the rotor subassembly the casing links to each other.

According to some embodiments of the utility model, still include the cable subassembly, the cable subassembly includes wire, cable terminal and protection support piece, cable terminal and wire electricity are connected, protection support piece wraps up at least the wire with the junction of cable terminal, the cable terminal with the circuit board electricity is connected.

According to some embodiments of the utility model, still include the protection casing, the protection casing cover the outside of circuit board, the protection casing is fixed on the support.

According to the utility model discloses a some embodiments, the circuit board passes through fixed connector to be fixed on the support, be equipped with the anticreep fore-set on the protection casing, the anticreep fore-set with fixed connector is just to preventing in order to set up fixed connector drops.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a front view of a brushless motor according to an embodiment of the present invention;

fig. 2 is a top view of a brushless motor according to an embodiment of the present invention;

FIG. 3 is a sectional view taken along line A-A of FIG. 2;

FIG. 4 is an enlarged view at A in FIG. 3;

fig. 5 is an exploded view of a brushless motor according to an embodiment of the present invention;

fig. 6 is a perspective view of a bracket according to an embodiment of the present invention;

FIG. 7 is a perspective view of an electrical connector according to one embodiment of the present invention;

fig. 8 is a schematic view of the connection relationship between the dust cap and the bracket and the circuit board according to an embodiment of the present invention;

fig. 9 is a block diagram of an electrical connector and stator core according to some embodiments of the present invention.

Reference numerals:

the brushless motor (100) is provided with a motor,

a rotor assembly 10, a housing 1, a bushing 2, a rotary shaft 3, a permanent magnet 4,

stator assembly 11, bracket 6, step column 601, bearing seat 602, support block 603, buckling part 604, threshold part 605, stud 606, heat dissipation rib 607, isolation hole 608, inner boss 609, second water drainage hole 610, matching convex column 611, coil winding 7, stator core 8, insulation layer 20, terminal slot 201, electric connector 9, terminal base 901, hook 902, flush part 902a, hook 902b,

a retainer ring 5, a bearing 12, a heat conducting layer 13, a circuit board 14, a fixed connecting piece 15, a sealing plug 16, an elastic gasket 17,

a protective cover 18, a buckle 1801, an outer boss 1802, an anti-falling top column 1803, a first drain hole 1804,

the cable assembly 19, the wire 1901, the guard support 1902, the groove 1902a, the stud crimp cap 1902b, and the cable terminal 1903.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", "circumferential", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A brushless motor 100 according to an embodiment of the present invention is described below with reference to fig. 1 to 9, and as shown in fig. 1, 2, 3, and 5, the brushless motor 100 may generally include: a support 6, a rotor assembly 10, a positioning member, a stator assembly 11 and a circuit board 14.

Specifically, as shown in fig. 3, 5 and 6, one side of the bracket 6 is provided with a matching boss 611, the rotor assembly 10 includes a housing 1, a rotating shaft 3 and a permanent magnet 4, the rotating shaft 3 is connected to the housing 1 to drive the housing 1 to rotate synchronously, a first end of the rotating shaft 3 extends out of the housing 1, a second end of the rotating shaft 3 extends into the matching boss 611, and the permanent magnet 4 is disposed on an inner peripheral wall of the housing 1. In other words, the rotor assembly 10 is composed of the casing 1, the bushing 2, the rotating shaft 3 and the permanent magnet 4 attached to the inner side of the casing 1, the rotating shaft 3 is connected with the casing 1 to form a whole, the rotor drives the casing 1 and the permanent magnet 4 to rotate synchronously when rotating, one end of the rotating shaft 3 extends out of the casing 1 to form an output end, the second end of the rotating shaft 3 extends into the matching boss 611, and the rotating shaft 3 is connected with the bracket 6 in a self-rotating manner.

As shown in fig. 3, 5 and 9, the stator assembly 11 includes a stator core 8, a coil winding 7 and an electrical connector 9, the stator assembly 11 is disposed in the casing 1, the stator core 8 is sleeved on the matching boss 611, the coil winding 7 is wound on the stator core 8, an insulation layer 20 is disposed between the coil winding 7 and the stator core 8, and the electrical connector 9 is electrically connected to the coil winding 7. Stator module 11 comprises stator core 8, coil winding 7 and electric connector 9, and stator core 8 overcoat is on cooperation projection 611 and with cooperation projection 611 fixed connection, and coil winding 7 winds on stator core 8, and coil winding 7 is in order to form alternating magnetic field when circular telegram, and alternating magnetic field and the magnetic field of permanent magnet interact, and like this, rotor subassembly 10 can rotate around stator module 11. Wherein, electric connector 9 is connected with coil winding 7 electricity, sets up insulating layer 20 between coil winding 7 and stator core 8, can effectively keep apart coil winding 7 and stator core 8 electricity, avoids stator core 8 electrified, improves the application security.

As shown in fig. 3 and 5, a circuit board 14 is fixed on the other side of the bracket 6, and the electrical connector 9 is electrically connected to the circuit board 14. That is, the circuit board 14 and the rotor assembly 10 are respectively disposed on two opposite sides of the bracket 6, and the circuit board 14 is fixed on the other side of the bracket 6 opposite to the rotor assembly 10, compared with the case in which the circuit board 14 is disposed in the casing 1 in the related art, the heat generated by the heating element of the circuit board 14 in the related art cannot be effectively dissipated, so that the heat dissipation of the circuit board 14 can be facilitated, and the performance of the brushless motor 100 can be improved.

In addition, in the related art, a substrate holding member is required to couple the circuit board 14 and the housing, and the present application eliminates the substrate holding member and directly replaces the housing and the substrate holding member with the bracket 6, so that the number of parts of the brushless motor 100 can be reduced, and the production efficiency of the brushless motor 100 can be improved.

According to the utility model discloses brushless motor 100 is through setting up support 6 to locate support 6's relative both sides with rotor subassembly 10 and circuit board 14 branch, made things convenient for circuit board 14's heat dissipation, promoted brushless motor 100's life and security, also simplified brushless motor 100's structure, be favorable to improving brushless motor 100's production efficiency.

In the related art, the wires and the wire holding portions need to be placed at appropriate positions and fastened and then soldered to the circuit board 14, which is difficult and inefficient to operate. The electric connector 9 and the coil winding 7 can be riveted or welded in advance and then encapsulated to form a whole, so that the assembly is easier on a production line.

According to an example of the present invention, as shown in fig. 5 and 6, the bracket 6 is provided with an isolation hole 608, and the electrical connector 9 passes through the isolation hole 608 to be electrically connected to the circuit board 14. That is, the circuit board 14 is electrically connected to the electrical connector 9, and the electrical connector 9 is electrically connected to the coil winding 7, wherein the coil winding 7 and the circuit board 14 are respectively disposed on two opposite sides of the bracket 6, the isolation hole 608 is disposed on the bracket 6, and the electrical connector 9 is inserted through the isolation hole 608 to be electrically connected to the circuit board 14 and the coil winding 7, respectively, so that a path of current from the circuit board 14 to the coil winding 7 can be shortened, which is beneficial to improving the integrity of the brushless motor 100. In addition, the electrical connector 9 passes through the isolation hole 608, and the bracket 6 also plays a role of fixing the electrical connector 9, thereby improving the connection stability of the electrical connector 9. In addition, it should be noted that the isolation hole 608 can also electrically isolate the electrical connector 9 from the bracket 6, so as to avoid the bracket 6 from being electrified, and improve the safety performance of the brushless motor 100.

In some alternative embodiments, as shown in fig. 3 and 5, the isolation hole 608 is filled with a sealing plug 16, and the electrical connector 9 passes through the sealing plug 16. The terminal passes through the sealing plug 16 and is welded on the circuit board 14, the sealing plug 16 has a plurality of ring protrusions, and the ring protrusions are compressed and fixed in the isolation holes 608 of the bracket 6, so that the terminal and the bracket 6 can be isolated in an insulation way, media on two sides of the bracket 6 are prevented from mutually permeating, and the dustproof and waterproof capacity of the brushless motor 100 is improved.

In some embodiments, as shown in fig. 3, 4 and 9, the insulating layer 20 is provided with a positioning groove into which a portion of the electrical connector 9 is inserted. The insulating layer 20 is provided with terminal slots 201 for inserting terminals therein for positioning and fixing.

In some embodiments, as shown in fig. 5, 7 and 9, the electrical connector 9 includes a terminal base 901 and a hook 902, the hook 902 is disposed on the terminal base 901, and the enamel wire of the coil winding 7 is hung on the hook 902. Specifically, the terminal base 901 and the flush part 902a of the hook 902 are fixed together by riveting or welding, and the hook 902b of the hook 902 can be used for hanging the enameled wire on the winding, so that the structure saves raw materials and can flexibly adjust the relative position of the terminal base 901 and the hook 902. For example, in different types of brushless motors 100, the relative positions of the terminal base 901 and the hook 902 may be different, and with the electric connector 9 of the present application, the connection position of the hook 902 and the terminal base 901 may be selectively selected to facilitate the connection of the electric connector 9 with the enameled wire. It should be further noted that the enameled wire of the coil winding 7 is hung on the hook 902, and the enameled wire is connected and fixed with the hook 902 by welding, so that the enameled wire can be stably and electrically connected with the electrical connector 9.

In some embodiments, as shown in fig. 3 and 6, a thermally conductive layer 13 is provided between the circuit board 14 and the bracket 6. A heat conducting layer 13 is disposed between the circuit board 14 and the bracket 6, and heat generated by the heating element on the circuit board 14 can be transferred to the bracket 6 through the heat conducting layer 13 and radiated outwards through the bracket 6, thereby further improving the heat dissipation performance of the brushless motor 100.

Preferably, as shown in fig. 6, the bracket 6 is provided with a plurality of heat dissipation ribs 607 arranged at intervals. A plurality of heat dissipation ribs 607 are radial extension and arrange along support 6's circumference interval, through setting up heat dissipation rib 607, have improved support 6's heat-sinking capability, have further improved brushless motor 100's heat-sinking capability, have promoted brushless motor 100's life.

In some embodiments, as shown in fig. 3, 5 and 6, the support 6 is provided with a support block 603 extending towards the stator core 8, and the support block 603 abuts against the stator core 8 and/or the insulating layer 20. In this way, by providing the supporting block 603 and stopping the supporting block 603 against the stator core 8 and/or the insulating layer 20, when the stator assembly 11 is under pressure, the supporting block 603 can play a role of auxiliary support, and thus, the stability of the stator assembly 11 can be improved. For example, when the brushless motor 100 falls, the stator assembly 11 is easy to fall off from the matching boss 611 or to generate relative displacement, and the supporting block 603 is arranged to support the stator assembly 11, so that the displacement of the stator assembly 11 towards the direction of the bracket 6 is limited, and the anti-falling capability of the brushless motor 100 is improved.

In some embodiments, as shown in fig. 3, a plurality of bearings 12 are disposed in the matching protrusion 611, and each bearing 12 is sleeved on the rotating shaft 3. By providing the bearing 12, friction between the mating boss 611 and the rotating shaft 3 can be reduced, so that the rotating shaft 3 is rotatably connected with the mating boss 611. In addition, the stable operation of the rotary shaft 3 can be ensured by the plurality of bearings 12 arranged at intervals.

For example, two bearings 12, three bearings 12, four bearings 12 or more bearings 12 may be disposed in the matching convex column 611 at intervals, preferably, two bearings 12 are disposed in the matching convex column 611 at intervals, and the two bearings 12 are disposed on two sides of the matching convex column 611, in other words, two bearing seats 602 are disposed on two sides of the matching convex column 611 respectively, and the middle is separated by a step, which may facilitate the form and location tolerance processing of the two bearing seats 602.

In some alternative embodiments, as shown in fig. 3 and 5, the brushless motor 100 further includes a positioning member, the positioning member includes a retaining ring 5 and an elastic member, the retaining ring 5 and the elastic member are disposed at intervals along the length direction of the rotating shaft 3, the retaining ring 5 abuts against the end portion of the second end of the rotating shaft 3, and two ends of the elastic member are respectively connected to one of the bearings 12 and the housing 1. For preventing the axial float of rotation axis 3, this scheme is spacing with retaining ring 5 at the second end of rotation axis 3 protrusion top bearing 12, retrains with elastic washer 17 between bearing 12 and the casing 1, establishes the setting element on support 6 and with the axial displacement of rotation axis 3 cooperation in order to restrict rotation axis 3, has increased the stationarity of motor operation.

In some embodiments, as shown in fig. 5, the brushless motor 100 includes a cable assembly 19, the cable assembly 19 includes a wire 1901, a cable terminal 1903, and a protective support 1902, the cable terminal 1903 is electrically connected to the wire 1901, the protective support 1902 covers at least a connection of the wire 1901 and the cable terminal 1903, and the cable terminal 1903 is electrically connected to the circuit board 14. After the wire 1901 and the cable terminal 1903 of the cable assembly 19 are riveted or welded together, a rubber material is injected or compression molded to form a protective support 1902, and the bare portion of the wire 1901 and the riveted portion of the cable terminal (the connection portion between the cable terminal and the circuit board 14) are covered and protected to prevent current leakage. The lead 1901 and the cable terminal 1903 are directly molded and formed, so that the time for placing and assembling on site is reduced, and the production efficiency is improved; increasing the pull-off force between wire 1901 and the cable termination; the cable terminal 1903 and the harness interface are protected from contact with a conductive medium such as water, and short-circuiting and the like are prevented.

In some alternative embodiments, as shown in fig. 5 in conjunction with fig. 8, the guard support 1902 is fixed to the support 6. Circuit board 14 is fixed in on support 6, will protect the support frame also to fix on support 6, makes things convenient for cable terminal 1903 and circuit board 14 to be connected electrically, can improve brushless motor 100's wholeness.

In some embodiments, as shown in fig. 3, 5 and 8, a protective cover 18 is further included, the protective cover 18 covering the outside of the circuit board 14, and the protective cover 18 is fixed to the bracket 6. The protective cover 18 is covered on the outer side of the circuit board 14, so that the circuit board 14 can be located in a closed space, dust, water drops and the like can be prevented from entering the circuit board 14, and the situation that the circuit board 14 is short-circuited can be effectively avoided.

Further, as shown in fig. 3, 5 and 8, an annular inner boss 609 is provided on the abutment end surface of the holder 6 facing the shield 18, an annular outer boss 1802 is provided on the end surface of the shield 18 facing the holder 6, the outer boss 1802 is located outside the inner boss 609, and the outer boss 1802 abuts on the abutment end surface. Therefore, a space for accommodating the circuit board 14 can be formed between the protective cover 18 and the bracket 6, the positioning of the protective cover 18 is facilitated through the arrangement mode of the inner boss 609 and the outer boss 1802, the sealing performance between the protective cover 18 and the bracket 6 can be enhanced, and the connection between the bracket 6 and the protective cover 18 is more stable.

Of course, the above embodiments are merely illustrative and should not be construed as limiting the scope of the present invention, for example, the protective cover 1818 may be a flat plate, the outer periphery of the bracket 6 may be provided with a boss protruding toward the protective cover 1818, and the flat plate may be covered on the boss.

Advantageously, the shield 18 is a piece of conductive plastic material. The protective cover 18 may be formed from an electrically conductive rubber material, such as carbon fiber or graphite, so that the protective cover 1818 has thermal conductivity, reinforcement, light weight, and magnetic interference resistance. Specifically, the carbon fiber, graphite and other components are added to improve the strength of the product. The internal components can be protected, and the product can be light and thin to achieve weight reduction and cost reduction; the addition of carbon fiber and graphite can accelerate heat conduction; the addition of carbon fiber and graphite can form a conductive path and improve the resistance to EMC interference.

Preferably, as shown in fig. 3, 5 and 8, the circuit board 14 is fixed on the bracket 6 by a fixing connector 15, and the protective cover 18 is provided with an anti-falling top pillar 1803, and the anti-falling top pillar 1803 is arranged opposite to the fixing connector 15 to prevent the fixing connector 15 from falling off. Wherein, the fixed connector 15 can be a set screw, when the protective cover 1818 covers the bracket 6, the anti-dropping top pillar 1803 stops against the fixed connector 15, thus preventing the fixed connector 15 from dropping from the bracket 6 and improving the connection stability of the circuit board 14.

In one embodiment, the brushless motor 100 may be a dc brushless motor 100, as shown in fig. 3 and 5, and mainly includes a rotor assembly 10, a stator assembly 11, a circuit board 14, a shield 18, and a cable assembly 19.

As shown in fig. 3, the rotor assembly 10 includes: the magnetic bearing comprises a machine shell 1, a lining 2, a rotating shaft 3 and a plurality of magnetic shoes attached to the inner side of the machine shell 1. The rotating shaft 3 is connected with the casing 1 into a whole through the bushing 2, of course, in other cases, the rotating shaft 3 can be directly connected with the casing 1, and the magnetic shoes form permanent magnets with N-S poles in pairs. The stator assembly 11 includes: support 6, coil winding 7, stator core 8, electric connector 9 constitute. The stator core 8 is externally wrapped with an insulating layer 20, the insulating layer 20 is directly wrapped and molded by the iron core externally wrapped with the insulating layer 20 after being laminated and riveted, the coil winding 7 can be effectively isolated from the stator core 8, and the application safety is improved.

In this case, the circuit board 14 is mounted on the bracket 6 in an upward direction, and the rotor and the housing 1 are in a downward direction.

As shown in fig. 3, 5 and 6, a bearing seat 602 is disposed inside the step pillar 601 of the bracket 6 and can receive the bearing 12 therein. In this case, a double-bearing 12 scheme is adopted, that is, two sides of the step column 601 are respectively provided with a bearing seat 602, and the middle is isolated by a step, so that the scheme can be beneficial to ensuring the form and position tolerance processing of the two bearing seats 602. The rotary shafts 3 pass through the inner bores of the two bearings 12, respectively. In order to prevent the axial movement of the rotating shaft 3, the upper end of the rotating shaft 3 protruding out of the top bearing 12 is limited by the retainer ring 5, and the bottom bearing 12 and the bushing 2 (or the casing 1) are restrained by the elastic washer 17, so that the running stability of the motor is improved.

As shown in fig. 3 and 6, the bracket 6 has a step column 601, a central hole of the stator core 8 can be sleeved on the step column 601, a shoulder can limit the position of the core coated with the insulating layer 20, and a plurality of supporting blocks 603 are arranged in the same direction as the step column 601 of the bracket 6. Theoretically, the stepped column 601 and the supporting block 603 are equal in height to support the core of the outer insulating layer 20 together, but actually, it is difficult to have absolute equal height, the supporting block 603 can be made to be slightly shorter than the stator core 8, and the supporting block 603 can play an auxiliary supporting role when the stator core 8 is stressed. When the height of the core of the outer insulating layer 20 is to be adjusted high, the height of the stator core 8 can be adjusted preferentially by adjusting the height of the supporting block 603. The stator core 8 is provided with terminal slots 201 for inserting the electrical connectors 9 therein for positioning and stabilizing. The coil winding 7 is wound between the iron core coated with the insulating layer 20 and the electric connecting piece 9, current transmitted from the electric connecting piece 9 acts on the iron core to generate a magnetic field, and the magnetic field and the magnetic shoe of the permanent magnet are in a staggered action to urge the rotor assembly 10 to rotate. The electrical connector 9 passes through the sealing plug 16 and is soldered on the circuit board 14. the sealing plug 16 has a plurality of annular protrusions which are compressed and fixed in the isolation holes 608 of the bracket 6, thereby isolating the electrical connector 9 from the bracket 6 and preventing media on both sides of the bracket 6 from penetrating each other.

As shown in fig. 3, 5 and 8, the circuit board 14 is fixed on the stud 606 of the bracket 6 by the fixing connector 15, a heat dissipation rubber pad is arranged between the circuit board 14 and the bracket 6, and the electric power generated by the heating element on the circuit board 14 can be conducted to the bracket 6 through the heat dissipation rubber pad and radiated out through the bracket 6, especially the heat dissipation ribs 607 dispersed outside the bracket 6.

As shown in fig. 8, the peripheral contour of the top surface of the bracket 6 is distributed with step parts which are matched with the side wall parts of the protective cover 18, thereby sealing and preventing sand and dust from entering. The protective cover 18 is provided with a buckle 1801 around, which can be buckled on the buckling part 604 of the bracket 6, so as to be easy to assemble and prevent vibration falling. The shield 18 may be formed from a conductive rubber material.

As shown in fig. 5, after the wires 1901 of the cable assembly 19 and the cable terminals 1903 are riveted or welded together, a protective support 1902 is formed by injecting or molding a rubber material, and the bare wires and the riveted portions of the wires 1901 are covered and protected to prevent current leakage. The protective support 1902 has a groove 1902a, and the bracket 6 has a notch, the notch is provided with a threshold 605, the groove 1902a can be clamped on the threshold 605, and the protective cover 18 can be fastened to prevent moisture, sand and dust from entering from the threshold 605. The protective support 1902 is further provided with a stud pressing cap 1902b, which is fixed by the fixing connector 15 to reduce the shaking. The cable assembly 19 having such a protective support 1902 may be quickly assembled in production while facilitating alignment soldering of the cable terminals 1903 to the circuit board 14.

As shown in fig. 3, 7 and 9, the electrical connector 9 is composed of two parts, namely a terminal base 901 and a hook 902, the terminal base 901 and the flush part 902a of the hook 902 are fixed together by riveting or welding, and the hook 902b of the hook 902 can be hung on the enameled wire on the coil winding 7. The electric connector 9 generally uses copper as raw materials, and by adopting the structure, the material utilization rate is high, the material cost is reduced, the welding position is flexible, and the electric connector is applicable to more occasions.

As shown in fig. 8, the protective cover 1818 is further provided with a first drain hole 1804, and the first drain hole 1804 is formed on the outer circumferential surface of the protective cover 1818. The bracket 6 is further provided with a second drain hole 610 corresponding to the first drain hole 1804, and the first drain hole 1804 is communicated with the second drain hole 610. Through setting up the wash port, can discharge ponding through the wash port, improve brushless motor 100's security performance.

Other configurations and operations of the brushless motor 100 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A brushless motor, comprising:

the support is provided with a matching convex column on one side;

a rotor assembly including a rotating shaft extending into the mating boss;

the stator assembly comprises a stator core, a coil winding and an electric connecting piece, the stator core is sleeved on the matching convex column, the coil winding is wound on the stator core, an insulating layer is arranged between the coil winding and the stator core, and the electric connecting piece is electrically connected with the coil winding;

the circuit board is fixed on the other side of the support, and the electric connecting piece is electrically connected with the circuit board.

2. The brushless electric machine of claim 1, wherein the bracket is provided with an isolation hole, and the electrical connector passes through the isolation hole to be electrically connected to the circuit board.

3. The brushless electric machine of claim 2, wherein the isolation hole is filled with a sealing plug through which the electrical connection passes.

4. The brushless electric machine of claim 1, wherein the electrical connector includes a terminal base and a hook, the hook being provided on the terminal base, the enameled wire of the coil winding being hung on the hook.

5. The brushless electric machine of claim 1, wherein a thermally conductive layer is disposed between the circuit board and the bracket.

6. The brushless electric machine of claim 1, wherein the bracket is provided with a support block extending toward the stator core, the support block abutting against the stator core and/or the insulation layer.

7. The brushless electric machine of claim 1, wherein a plurality of bearings are disposed in the mating posts at intervals, each of the bearings being fitted over the rotating shaft;

brushless motor still includes the setting element, the setting element includes retaining ring and elastic component, the retaining ring with the elastic component is followed the length direction interval of rotation axis sets up, the retaining ring end is in the tip of the second end of rotation axis, the both ends of elastic component respectively with one of them bearing with the casing of rotor subassembly links to each other.

8. The brushless electric machine of claim 1, further comprising a cable assembly including wires, cable terminals electrically connected to the wires, and a protective support wrapping at least a junction of the wires and the cable terminals, the cable terminals electrically connected to the circuit board.

9. The brushless electric machine of any of claims 1-8, further comprising a protective cover covering an outside of the circuit board, the protective cover being secured to the bracket.

10. The brushless electric machine of claim 9, wherein the circuit board is fixed to the bracket by a fixing connector, and the protective cover is provided with an anti-falling pillar, and the anti-falling pillar is disposed opposite to the fixing connector to prevent the fixing connector from falling off.

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