Heat dissipation device, brushless motor rotor structure and heat dissipation controller

Abstract

The utility model discloses a heat dissipation device, a brushless motor rotor structure and a heat dissipation controller, the heat dissipation device comprises a machine base and a heat dissipation fan, the machine base comprises heat dissipation fins, a heat dissipation air channel is formed between the adjacent heat dissipation fins, the heat dissipation air channel and the heat dissipation fan form a heat dissipation path, air circulates along the heat dissipation path, and through the arrangement of the heat dissipation fan located at the upper end of a grinding disc, the heat dissipation effect is improved. The cooling fan is driven by the double-shaft motor to rotate, so that external air is sucked from the outer side of the base under the action of the cooling fan and enters the cooling fan through the air inlet and the connecting hole, air flow on the outer side of the base is accelerated, and heat exchange between the base and the cooling fins and the external air is accelerated; and finally, the air subjected to heat exchange is exhausted through the air outlet, so that the heat dissipation speed of the base is accelerated, and the use temperature of the double-shaft motor during use is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of electric motors and relates to a heat dissipation device, a brushless motor rotor structure and a heat dissipation controller. Background Art

[0002] In the process of house decoration, painting the wall is a crucial decoration content, and fine grinding of the painted wall to improve the flatness of the wall is essential. However, in the traditional grinding process, a lot of dust will be generated. In order to reduce the dust;

[0003] The motor in the existing wall grinder is directly connected to the grinding disc, and the existing motor is generally composed of a stator and a rotor wrapped by a shell. The motor will generate a lot of heat when working, and a shell is usually provided on the outside of the motor. The heat generated by the motor is difficult to be quickly transferred to the outside air through the shell and the shell, so that the operating temperature of the motor is high when the motor is working, and the motor cannot work continuously for a long time, which reduces the wall grinding efficiency.

[0004] At present, the motor rotor is the core component of the DC motor. It transmits force through permanent magnets. When the motor is working, the motor rotor not only bears the impact of the transmitted force, but also bears the centrifugal force generated when the rotor rotates at high speed. Therefore, the structure of the rotor directly affects the performance and life of the DC motor. The permanent magnets on the rotor of the traditional brushless permanent magnet high-power motor are generally fixed to the rotor core by adhesive. This structure is simple and practical, and easy to produce and process. However, the disadvantage is that due to the temperature changes caused by the long-term operation of the motor and the natural aging of the adhesive, the bonding force between the permanent magnet and the rotor core gradually degrades. Under the centrifugal force generated by the high-speed rotation of the motor, the permanent magnet will fall off, causing the motor to fail and fail to operate normally.

[0005] The controller of an existing wall grinder is generally equipped with a large number of power components, which usually generate a large amount of heat when performing normal work. Since the controller is generally wrapped with an outer shell on the outside, which usually has only small air holes, the controller of the existing grinder generates serious heat when in use. After working for a long time, the controller usually needs to be shut down for a certain period of time to cool down, which greatly affects the working efficiency of wall grinding. Summary of the invention

[0006] In order to overcome the deficiencies of the prior art, the present invention provides a heat dissipation device, a brushless motor rotor structure and a heat dissipation controller.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a heat dissipation controller, including a controller body, the controller body including a shell, a circuit board, a fixing seat and a heat dissipation block, the circuit board, the fixing seat and the heat dissipation block are respectively arranged inside the shell, the heat dissipation block is arranged on the fixing seat, and the circuit board is arranged on the heat dissipation block.

[0008] Furthermore, the controller body is arranged outside the hollow handle of the grinder, and the heat dissipation block is arranged in close contact with the hollow handle.

[0009] Furthermore, it also includes a power element, which is electrically connected to the circuit board and is fitted with the heat sink.

[0010] Furthermore, the fixing seat is provided with a wire passage groove, the wire passage groove is provided with a plurality of connecting grooves arranged corresponding to the circuit board, and the connecting groove is provided with a shielding plate.

[0011] Furthermore, the housing is provided with a controller and a card slot, and the card slot is located on the outside of the controller.

[0012] Furthermore, the shell is provided with heat dissipation holes, which correspond to the circuit board. An installation box is provided on the outside of the circuit board, and the installation box is arranged inside the shell.

[0013] Furthermore, the housing includes two symmetrically arranged outer shells, and the two outer shells are connected to each other.

[0014] Furthermore, the shell is provided with a power hole, a power cord is provided inside the power hole, the power hole is provided with a locking base corresponding to the power cord, and the locking base is provided with a movable clamping seat.

[0015] Furthermore, the fixing seat is provided with a threaded seat, and a fixing screw is provided on the inner side of the threaded seat. The fixing screw passes through the threaded seat and is threadedly connected to the heat dissipation block.

[0016] Furthermore, a plurality of buckle protrusions are provided on the inner side of the wiring groove, and a buckle hole adapted to the buckle protrusions is provided on the shielding plate.

[0017] A heat dissipation device comprises a base and a heat dissipation fan. The base comprises heat dissipation fins. Heat dissipation airways are formed between adjacent heat dissipation fins. The heat dissipation airways and the heat dissipation fan form a heat dissipation path. Gas flows along the heat dissipation path.

[0018] Furthermore, the base includes an air intake base and a heat dissipation base. The air intake base is located outside the heat dissipation fan. The air intake base is provided with an air outlet connected to the heat dissipation fan. A plurality of heat dissipation fins are arranged on the heat dissipation base.

[0019] Furthermore, it also includes a separation layer, which is located between the cooling fan and the stator of the dual-axis motor, and the separation layer isolates the cooling fan from the stator.

[0020] Furthermore, the air intake seat is provided with an air inlet, the air inlet is communicated with the heat dissipation air duct, and the partition layer is provided with a connecting hole for connecting the air inlet and the heat dissipation fan.

[0021] Furthermore, the heat dissipation fan includes a heat dissipation fixing plate and a plurality of heat dissipation fins, wherein the plurality of heat dissipation fins are radially arranged on the heat dissipation fixing plate, and adjacent heat dissipation fins form a heat dissipation area for heat dissipation, and gas flows outward along the heat dissipation area to dissipate heat.

[0022] Furthermore, a shaft sleeve is arranged at the center of the heat dissipation fixing plate, and the shaft sleeve is connected to the rotating shaft of the dual-axis motor.

[0023] Furthermore, the spacing between adjacent heat sinks away from the shaft sleeve increases gradually.

[0024] Furthermore, the heat sink includes an air suction portion and an air guide portion, the height of the air guide portion is greater than the height of the air suction portion, and the front end surface of the air suction portion is set as an arc surface.

[0025] Furthermore, the plurality of heat dissipation fins are distributed in sequence along the circumferential direction of the base.

[0026] Furthermore, the heat sink is arranged on the upper side of the air suction seat, the air outlet is located on the left and right sides of the air suction seat, and a plurality of heat sinks are radially distributed on the heat dissipation fixing plate with the shaft sleeve as the center.

[0027] A brushless motor rotor structure comprises a rotating shaft, a rotor core, a positioning frame, a permanent magnet and a fixing sleeve, wherein the rotor core is arranged outside the rotating shaft, the positioning frame is arranged outside the rotor core, the permanent magnet is arranged outside the positioning frame, and the fixing sleeve is arranged outside the permanent magnet.

[0028] Furthermore, the positioning frame is provided with a plurality of spacer bars, adjacent spacer bars form a spacer cavity, and the permanent magnet is arranged in the spacer cavity.

[0029] Furthermore, the positioning frame is provided with a rotor core mounting hole, the rotor core mounting hole is provided with a plurality of clamping grooves, and the rotor core is provided with clamping protrusions adapted to the clamping grooves.

[0030] Furthermore, it also includes a limit seat, and the limit seat is provided in at least one pair, and the limit seat is respectively provided at two ends of the rotor core, and the limit seat is respectively provided in contact with the permanent magnet.

[0031] Furthermore, the outer surface of the positioning frame is fitted with the inner surface of the permanent magnet, and the inner surface of the fixing sleeve is fitted with the outer surface of the permanent magnet.

[0032] Furthermore, the partition cavities correspond to the permanent magnets one by one, and one permanent magnet is arranged in one partition cavity.

[0033] Furthermore, a cavity is formed between adjacent permanent magnets and fixing sleeves, and an adhesive is arranged in the cavity to fix the permanent magnet and the fixing sleeve, and the cavity is located on the side of the permanent magnet.

[0034] Furthermore, the rotor core includes protrusions, the protrusions are located at two ends of the rotor core, and the positioning frame is arranged between the two protrusions, and the protrusions are arranged to fit with the two ends of the positioning frame.

[0035] Furthermore, a plurality of the permanent magnets are arranged in a ring shape outside the positioning frame.

[0036] Furthermore, the central axes of the rotating shaft, the rotor core and the positioning frame are collinear or approximately collinear, the length direction of the spacer bar is parallel to the axial direction of the positioning frame, the length of the spacer bar matches the length of the permanent magnet, and the fixing sleeve is set to be a seamless steel pipe.

[0037] In summary, the present invention is beneficial in that:

[0038] 1. The present invention is provided with a fixing seat fixedly wrapped around the outer side of the hollow handle, the fixing seat is equipped with a heat sink fitted with the hollow handle, and the power element is fitted on the outer surface of the heat sink, the heat generated by the power element is transported to the heat sink through heat exchange, and the heat sink transfers the heat to the hollow handle. Since the dust suction device is modified to suck a large amount of air and dust into the hollow handle during operation, the air flow speed in the hollow handle is accelerated, so that the heat exchange speed between the hollow handle and the inner flowing air is accelerated, so that the hollow handle transfers the heat to the flowing air, so that the temperature of the hollow handle is rapidly reduced, which greatly reduces the temperature of the controller body during use, so that the controller can continue to work at a high temperature for a long time.

[0039] 2. The present invention is provided with a cooling fan located at the upper end of the grinding disc, and the cooling fan is driven to rotate by a dual-axis motor, so that under the action of the cooling fan, the outside air is sucked in from the outside of the base and enters the cooling fan through the air inlet and the connecting hole, thereby accelerating the air flow outside the base, accelerating the heat exchange between the base and the cooling fins and the outside air, and finally discharging the air after the heat exchange through the air outlet, thereby accelerating the heat dissipation speed of the base and reducing the operating temperature of the dual-axis motor when in use.

[0040] 3. The present invention has a reasonable structure. The permanent magnet is limited in the circumferential direction by the spacer bars arranged on the positioning frame, the permanent magnet is limited in the axial direction by a pair of limiting seats, and the permanent magnet is limited in the radial direction by the fixing sleeve and the positioning frame, thereby realizing the stable installation of the permanent magnet and the rotor core. The adjacent permanent magnets and the fixing sleeve of the present invention form a cavity, and the cavity is located on the side of the permanent magnet. By applying adhesive on the side of the permanent magnet, the working performance of the permanent magnet is effectively avoided. The present invention isolates the permanent magnet and the stator by the fixing sleeve, which greatly shortens the distance between the rotor and the stator, thereby enhancing the magnetic field strength and the mechanical energy generated when the rotor cuts the magnetic flux lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a structural diagram of the present invention;

[0042] Figure 2 This is the installation diagram of the heat dissipation controller;

[0043] Figure 3 It is a cross-sectional view of the heat dissipation controller and the hollow handle;

[0044] Figure 4 The rear view of the heat dissipation controller is shown;

[0045] Figure 5 This is the installation diagram of the fixing base, heat sink and circuit board;

[0046] Figure 6 This is an exploded diagram of a dual-axis motor;

[0047] Figure 7 is a schematic diagram of the rotor;

[0048] Figure 8 It is the top view of the rotor;

[0049] Fig. 9 It is the structural diagram of the rotating shaft and the rotor core;

[0050] Fig.10 This is a structural diagram of the positioning frame and permanent magnet.

[0051] Description of reference numerals: 1 housing, 2 hollow handle, 3 dual-axis motor, 3-1 base, 3-2 stator, 3-3 rotor, 3-4 cooling fan, 3-1-1 suction seat, 3-1-2 heat sink, 3-5 air outlet, 3-6 partition layer, 3-7 channel hole, 3-8 heat sink fin, 3-9 air inlet, 3-10 connection hole, 4 dust suction device, 50 controller body, 50-1 housing, 50-2 circuit board, 50-3 fixing seat, 53 heat sink, 54 power element, 55 threaded seat, 56 fixing screw, 50-1-1 outer shell, 57 wire groove, 58 connection groove, 59 shielding plate, 510 snap-on protrusion, 511 card hole, 512 controller, 513 card slot, 514 heat dissipation hole, 519 installation box, 515 power hole, 516 power cord, 517 locking base, 518 movable card seat, 26 rotating shaft, 27 rotor core, 28 permanent magnet, 29 positioning frame, 30 spacer bar, 31 limit seat, 32 seamless steel pipe, snap-on protrusion 272, rotor core mounting hole 291, protrusion 271, snap-on slot 292. DETAILED DESCRIPTION

[0052] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0053] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0054] All directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, horizontal, vertical...) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0055] Due to installation errors and other reasons, the parallel relationship referred to in the embodiments of the present invention may actually be an approximately parallel relationship, and the vertical relationship may actually be an approximately vertical relationship.

[0056] Embodiment 1:

[0057] like Figure 1-10As shown, a grinder includes a casing 1, a hollow handle 2, a dual-axis motor 3, a dust suction device 4 and a heat dissipation controller 5. The hollow handle 2, the dual-axis motor 3 and the dust suction device 4 are respectively arranged on the casing 1, and the heat dissipation controller 5 is arranged on the hollow handle 2. The heat dissipation controller 5 controls the opening and closing of the dual-axis motor 3 and the dust suction device 4.

[0058] The grinder also includes a heat dissipation controller 5, which includes a controller body 50. The controller body 50 includes a shell 50-1, a circuit board 50-2, a fixing seat 50-3 and a heat dissipation block 53. The circuit board 50-2, the fixing seat 50-3 and the heat dissipation block 53 are respectively located inside the shell 50-1. The circuit board 50-2 is fixed on the inner side of the shell 50-1, the heat dissipation block 53 is arranged on the fixing seat 50-3, the circuit board 50-2 is located at the lower end of the heat dissipation block 53, and the heat dissipation block 53 is provided with a power element 54 electrically connected to the circuit board 50-2. In this embodiment, the power element 54 is preferably located on the front and rear sides of the heat dissipation block 53.

[0059] In this embodiment, the controller body 50 is installed on the outside of the hollow handle 2 of the grinder, and the hollow handle 2 is used to suck dust.

[0060] The heat sink 53 is fitted to the hollow handle 2 .

[0061] In this embodiment, the fixing seat 50-3 is wrapped around the outside of the hollow handle 2, the heat sink 53 is arranged on the fixing seat 50-3 and is fitted with the hollow handle 2, and the power element 54 is fitted on the outer surface of the heat sink 53. When in use, the heat generated by the power element 54 is transported to the heat sink 53 through heat exchange, and the heat sink 53 transfers the heat to the hollow handle 2 and dissipates the heat to the outside air through the hollow handle 2. When the hollow handle 2 sucks dust, a large amount of air is extracted along with the dust, thereby accelerating the heat exchange capacity of the hollow handle 2 and greatly reducing the temperature of the controller body 50 during use.

[0062] The fixing seat 50-3 is provided with a threaded seat 55, which is located at the front and rear sides of the lower end of the fixing seat 50-3. A fixing screw 56 is provided on the inner side of the threaded seat 55. The fixing screw 56 passes through the threaded seat 55 and is threadedly connected to the heat sink 53. In this embodiment, the heat sink 53 is fixed by the fixing screw 56, so that the installation of the heat sink 53 is convenient and quick.

[0063] The shell 50-1 includes two symmetrically arranged front and rear outer shells 50-1-1, and the front and rear outer shells 50-1-1 are connected to each other by screws. In this embodiment, the shell 50-1 is a symmetrical structure of front and rear halves, which is convenient for the installation and disassembly of the shell, and is also convenient for the production and manufacturing of the shell 50-1.

[0064] The fixing seat 50-3 is provided with a wire passing groove 57, which is located at the rear end of the fixing seat 50-3. The wire passing groove 57 is provided with a plurality of connection grooves 58 corresponding to the circuit board 50-2. The outer side of the connection groove 58 is covered with a shielding plate 59. The inner side of the connection groove 58 is provided with a plurality of snap protrusions 510. The shielding plate 59 is provided with a snap hole 511 adapted to the snap protrusion 510. In this embodiment, the wire passing groove 57 is used to facilitate the storage of the powered wires in the controller body 50, and the heat generated by the wires can also be quickly transferred to the hollow handle 2 through the fixing seat 50-3.

[0065] The housing 50 - 1 is provided with a controller 512 , which is located at the upper end of the fixing seat 50 - 3 . The housing 50 - 1 is provided with a card slot 513 , which is located on the outer side of the controller 512 . In this embodiment, the card slot 513 facilitates the installation and positioning of the controller 512 .

[0066] The shell 50-1 is provided with a heat dissipation hole 514, which is located at the center of the front and rear ends of the shell 50-1 and corresponds to the circuit board 50-2. An installation box 519 is provided on the outside of the circuit board 50-2, and the installation box 519 is arranged inside the shell 50-1. In this embodiment, the heat dissipation hole 514 facilitates the normal heat exchange between the circuit board 50-2 and the outside air when it is working.

[0067] The shell 50-1 is provided with a power hole 515, and the power hole 515 is located on the lower right end of the shell 50-1. A power cord 516 is provided inside the power hole 515. The power hole 515 is provided with a locking base 517 corresponding to the power cord 516. The locking base 517 is located at the front end of the outer shell 50-1-1. The locking base 517 is provided with an active clamping seat 518. In this embodiment, the active clamping seat 518 is threadedly connected to the locking base 517 by screws. In this embodiment, the power hole 515 and the locking base 517 and the active clamping seat 518 for fixing the inner line of the power cord 516 make the power cord 516 easy to install, and the inner line is fixed by the locking base 517 and the active clamping seat 518, so as to avoid the line being pulled out of the circuit board when the power cord 516 is pulled, thereby improving the protection performance of the line and the power cord 516.

[0068] When the present invention is in use, the power element 54 on the circuit board 50-2 will generate a large amount of heat during operation, and the heat will be transferred to the heat sink 53 accordingly, and the heat in the heat sink 53 will be transferred to the tightly attached hollow handle 2. The hollow handle 2 is used to suck and transport dust when in use. The air in the hollow handle 2 flows quickly, and the heat in the hollow handle 2 is quickly transferred to the flowing air and discharged to the outside of the hollow handle 2 along with the hollow handle 2, thereby achieving rapid heat dissipation of the controller body.

[0069] The heat dissipation controller of this embodiment can also be used alone in existing equipment.

[0070] The dual-axis motor 3 includes a heat dissipation device, a stator 3-2 and a rotor 3-3 located inside the stator 3-2. The stator 3-2 is arranged inside the base 3-1. The base 3-1 is fixedly connected to the casing 1. The base 3-1 isolates the casing 1 and the stator 3-2.

[0071] The heat dissipation device includes a base 3-1 and a heat dissipation fan 3-4. The base 3-1 includes heat dissipation fins 3-8. Heat dissipation airways are formed between adjacent heat dissipation fins 3-8. The heat dissipation airways and the heat dissipation fan 3-4 form a heat dissipation path, and gas flows along the heat dissipation path.

[0072] The base 3-1 separates the stator 3-2 and rotor 3-3 of the dual-axis motor 3 from the casing 1. The heat generated by the operation of the stator 3-2 and the rotor 3-3 is transferred to the base 3-1, and the gas circulates quickly along the heat dissipation path to take away the heat, thereby accelerating the heat dissipation speed of the motor device and reducing the operating temperature of the motor device 2 when in use.

[0073] A plurality of heat dissipation fins 3-8 are arranged on the outer surface of the base 3-1. The plurality of heat dissipation fins 3-8 are sequentially distributed along the circumferential direction of the base 3-1. A heat dissipation air channel is formed between adjacent heat dissipation fins 3-8, and air flows along the heat dissipation air channel.

[0074] The cooling fan 3-4 is arranged at the lower end of the rotor 3-3 and at the upper end of the motor base 8. The base 3-1 includes an air suction base 3-1-1 located on the outside of the cooling fan 3-4 and a heat sink 3-1-2 located on the upper side of the air suction base 3-1-1. Air outlets 3-5 connected to the cooling fan 3-4 are provided on the left and right sides of the air suction base 3-1-1. A partition layer 3-6 installed on the inner side of the heat sink 3-1-2 is provided between the cooling fan 3-4 and the stator 3-2. A channel hole 3-7 located on the outer side of the rotor 3-3 is provided at the inner center of the partition layer 3-6. The partition layer 3-6 isolates the cooling fan 3-4 from the stator 3-2 to prevent the cooling fan 3-4 from being deformed due to heat after long-term operation.

[0075] The heat dissipation fan 3-4 includes a heat dissipation fixing plate 133 and a plurality of heat dissipation fins 131. The plurality of heat dissipation fins 131 are radially fixed on the heat dissipation fixing plate 133. Adjacent heat dissipation fins 131 form a heat dissipation area for heat dissipation. Gas flows outward along the heat dissipation area to dissipate heat.

[0076] The heat dissipation fixing plate 133 is configured as a circular plate structure, a shaft sleeve 132 is disposed at the center of the heat dissipation fixing plate 133, the rotating shaft 26 is connected to the shaft sleeve 132, and a plurality of heat dissipation fins 131 are radially distributed on the heat dissipation fixing plate 133 with the shaft sleeve 132 as the center, and the distance between adjacent heat dissipation fins 131 away from the shaft sleeve 132 is expanded, that is, the gas diffuses from the inside to the outside.

[0077] The heat sink 131 includes an air intake portion and an air guide portion, wherein the height of the air guide portion is greater than the height of the air intake portion. Figure 3From a visual angle, the front end surface of the air intake portion (the end surface that directly collides with the gas) is set to an arcuate surface. During the rotation of the heat dissipation fan 3-4, the gas flows to the air intake portion, and the gas is diverted and guided by the arcuate surface of the air intake portion, so that the gas flows along the air guide portion to the heat dissipation area for heat dissipation; the height difference between the air intake portion and the air guide portion in this embodiment causes most of the gas to collide with the air intake portion first, and the gas that has collided changes its flow direction and reduces its flow rate. The heat sink 131 is set to a curved structure, which extends the flow path of the gas in the heat sink 131. After the heat sink 131 rotates, under the action of centrifugal force, the gas flows along the air guide portion to the heat dissipation area, and flows outward and is discharged to the external space.

[0078] The air intake seat 3-1-1 is provided with an air inlet 3-9, and the air inlet 3-9 is located between adjacent heat dissipation fins 3-8 and connected with the heat dissipation air duct, and is located between the air intake seat 3-1-1 and the heat dissipation seat 3-1-2. The outer side of the partition layer 3-6 is provided with a connecting hole 3-10 connected with the air inlet 3-9 and the heat dissipation fan 3-4. In this embodiment, the heat dissipation fan 3-4 is driven to rotate by the dual-axis motor 3. Under the action of the heat dissipation fan 3-4, the outside air is sucked in from the outside of the base 3-1 and enters the heat dissipation fan 3-4 through the air inlet 3-9 and the connecting hole 3-10 in turn, thereby accelerating the air flow outside the base 3-1, and accelerating the heat exchange between the base 3-1 and the heat dissipation fins 3-8 and the outside air. The air after the heat exchange is discharged through the air outlet 3-5, thereby accelerating the heat dissipation speed of the base 3-1 and reducing the operating temperature of the dual-axis motor 3 when in use.

[0079] In this embodiment, when the cooling fan 3-4 rotates to absorb external air, the air flows along the cooling air duct and enters the cooling fan 3-4 through the air inlet 3-9 and the connecting hole 3-10, so that the inhaled flowing air is in continuous contact with the base 3-1 and the cooling fins 3-8 for heat exchange, thereby greatly reducing the temperature of the base 3-1 when in use.

[0080] The rotor 3 - 3 includes a rotating shaft 26 , a rotor core 27 , a positioning frame 29 , a permanent magnet 28 and a fixing sleeve 32 . The rotor core 27 is fixedly mounted on the outside of the rotating shaft 26 , the positioning frame 29 is fixedly mounted on the outside of the rotor core 27 , and the permanent magnet 28 is fixedly mounted on the outside of the positioning frame 29 .

[0081] The central axes of the rotating shaft 26, the rotor core 27 and the positioning frame 29 are collinear or approximately collinear. The rotor core 27 is sleeved on the outer surface of the rotating shaft 26, and the positioning frame 29 is sleeved on the outer surface of the rotor core 27. A plurality of permanent magnets 28 are provided, and the plurality of permanent magnets 28 are arranged in a ring shape on the outside of the positioning frame 29.

[0082] The rotor core 27 includes a protrusion 271, which is located at both ends of the rotor core 27. The positioning frame 29 is arranged between the two protrusions 271. The positioning frame 29 is limited in the axial direction by the protrusion 271, which improves the reliability of the installation and positioning of the positioning frame 29, avoids the positioning frame 29 from moving when the rotor rotates, and enhances stability.

[0083] A plurality of spacer bars 30 are fixedly provided on the outer surface of the positioning frame 29. The spacer bars 30 are evenly distributed in a ring shape. The length direction of the spacer bars 30 is parallel to the axial direction of the positioning frame 29. The length of the spacer bars 30 matches the length of the permanent magnet 28. Adjacent spacer bars 30 form a spacer cavity. The spacer cavity corresponds to the permanent magnet 28 one by one. One permanent magnet 28 is arranged in one spacer cavity. The permanent magnet 28 is limited in the circumferential direction by the spacer bars 30.

[0084] The outer surface of the positioning frame 29 is arranged to fit the inner surface of the permanent magnet 28 , thereby limiting the radial position of the permanent magnet 28 .

[0085] A rotor core mounting hole 291 for mounting the rotor core 27 is provided on the inner side of the positioning frame 29, and a plurality of evenly distributed snap-in grooves 292 are provided on the rotor core mounting hole 291. A snap-in protrusion 272 adapted to the snap-in groove 10 is provided on the outer side of the rotor core 27. The snap-in protrusion 272 and the snap-in groove 292 cooperate to position the rotor core 27 and the positioning frame 29 for installation, thereby improving installation efficiency and accuracy.

[0086] The brushless motor rotor structure also includes a limit seat 31, and a pair of limit seats 31 are respectively fixed at both ends of the rotor core 27, and the pair of limit seats 31 are respectively arranged in contact with the permanent magnet 28, so as to limit the permanent magnet 28 in the axial direction.

[0087] The fixing sleeve 32 is sleeved on the outside of the permanent magnet 28, and the fixing sleeve 32 wraps the permanent magnet 28 inside. The inner surface of the fixing sleeve 32 is fitted with the outer surface of the permanent magnet 28, so as to limit the permanent magnet 28 in the radial direction, prevent the permanent magnet 28 from falling out during use, and prevent the permanent magnet from moving during rotation, so that the positioning of the rotor is more accurate, and the magnetic field strength of different permanent magnets is the same, thereby ensuring the output power of the rotor.

[0088] like Figure 2 As shown, adjacent permanent magnets 28 and fixing sleeves 32 form a cavity 321, and the cavity 321 is used to apply adhesive to fix the permanent magnet 28 and the fixing sleeve 32. In this embodiment, the cavity 321 is located on the side of the permanent magnet 28. Compared with the existing method of applying adhesive on the outer side of the permanent magnet 28, this embodiment effectively avoids affecting the working performance of the permanent magnet 28 by applying the adhesive on the side of the permanent magnet 28.

[0089] In this embodiment, the permanent magnet 28 and the stator 3 - 2 are isolated by the fixing sleeve, which greatly shortens the distance between the rotor and the stator, thereby enhancing the magnetic field strength and the mechanical energy generated when the rotor cuts the magnetic flux lines.

[0090] In this embodiment, the fixing sleeve 32 is configured as a seamless steel pipe.

[0091] In this embodiment, the permanent magnet 28 is limited in the circumferential direction by setting a spacer bar 30 on the positioning frame 29, the permanent magnet 28 is limited in the axial direction by a pair of limiting seats 31, and the permanent magnet 28 is limited in the radial direction by a fixing sleeve 32, thereby achieving stable installation of the permanent magnet 28 and the rotor core 27. Compared with the problem of permanent magnet falling off caused by existing adhesive fixation, this embodiment ensures the stability of the installation of the permanent magnet 28 through structural improvement.

[0092] During the implementation of this embodiment, the permanent magnets 28 are sequentially arranged in the spacing cavities, and the permanent magnets 28 are limited in the circumferential direction by the spacing bars 30. Then, the adhesive is applied to the outside of the spacing bars 30, and then the fixing sleeve 32 is sleeved on the outside of the fixed permanent magnets 28. The permanent magnets 28 are limited in the radial direction by the fixing sleeve 32. Finally, the upper and lower limiting seats 31 are fixedly installed on the outside of the rotor core 27, and the permanent magnets 28 and the fixing sleeve 32 are limited in the upper and lower directions by the upper and lower limiting seats 31.

[0093] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

Claims

1. A heat dissipation controller, characterized in that: The controller body comprises a shell, a circuit board, a fixing seat and a heat sink. The circuit board, the fixing seat and the heat sink are arranged inside the shell respectively. The heat sink is arranged on the fixing seat and the circuit board is arranged on the heat sink.

2. A heat dissipation controller according to claim 1, characterized in that: The controller body is arranged outside the hollow handle of the grinder, and the heat dissipation block is arranged in close contact with the hollow handle.

3. A heat dissipation controller according to claim 1, characterized in that: It also includes a power element, which is electrically connected to the circuit board and is fitted with the heat sink.

4. A heat dissipation controller according to claim 1, characterized in that: The fixing seat is provided with a wire through groove, the wire through groove is provided with a plurality of connecting grooves arranged corresponding to the circuit board, and the connecting groove is provided with a shielding plate.

5. The heat dissipation controller according to claim 1, characterized in that: The shell is provided with a controller and a card slot, and the card slot is located outside the controller.

6. A heat dissipation controller according to claim 1, characterized in that: The shell is provided with heat dissipation holes, which correspond to the circuit board. An installation box is provided on the outside of the circuit board, and the installation box is arranged inside the shell.

7. The heat dissipation controller according to claim 1, characterized in that: The housing comprises two symmetrically arranged outer shells, and the two outer shells are connected to each other.

8. The heat dissipation controller according to claim 1, characterized in that: The shell is provided with a power hole, a power line is provided inside the power hole, the power hole is provided with a locking base corresponding to the power line, and the locking base is provided with a movable clamping seat.

9. The heat dissipation controller according to claim 1, characterized in that: The fixing seat is provided with a threaded seat, the inner side of which is provided with a fixing screw, which passes through the threaded seat and is threadedly connected to the heat sink.

10. A heat dissipation controller according to claim 4, characterized in that: a plurality of buckle protrusions are provided on the inner side of the wiring groove, and a buckle hole adapted to the buckle protrusion is provided on the shielding plate.

11. A heat dissipation device, characterized in that: It includes a machine base and a cooling fan. The machine base includes cooling fins. Cooling air ducts are formed between adjacent cooling fins. The cooling air ducts and the cooling fan form a cooling path. Gas flows along the cooling path. It also includes a partition layer. The partition layer is located between the cooling fan and the stator of the dual-axis motor. The partition layer isolates the cooling fan from the stator.

12. A heat dissipation device according to claim 11, characterized in that: The machine base comprises an air suction base and a heat dissipation base. The air suction base is located outside the heat dissipation fan. The air suction base is provided with an air outlet connected with the heat dissipation fan. A plurality of heat dissipation fins are arranged on the heat dissipation base.

13. A heat dissipation device according to claim 12, characterized in that: The air intake seat is provided with an air inlet, which is communicated with the heat dissipation air duct, and the partition layer is provided with a connecting hole for connecting the air inlet and the heat dissipation fan.

14. The heat dissipation device according to claim 11, characterized in that: The heat dissipation fan comprises a heat dissipation fixing plate and a plurality of heat dissipation fins, wherein the plurality of heat dissipation fins are radially arranged on the heat dissipation fixing plate, and adjacent heat dissipation fins form a heat dissipation area for heat dissipation, and gas flows outward along the heat dissipation area to dissipate heat.

15. A heat dissipation device according to claim 14, characterized in that: A shaft sleeve is arranged at the center of the heat dissipation fixing plate, and the shaft sleeve is connected to the rotating shaft of the dual-axis motor.

16. The heat dissipation device according to claim 11, characterized in that: The spacing between adjacent heat sink fins away from the shaft sleeve increases gradually.

17. The heat dissipation device according to claim 14, characterized in that: The heat sink comprises an air suction portion and an air guide portion, the height of the air guide portion is greater than the height of the air suction portion, and the front end surface of the air suction portion is arranged as an arc surface.

18. The heat dissipation device according to claim 11, characterized in that: The plurality of heat dissipation fins are distributed in sequence along the circumferential direction of the base.

19. The heat dissipation device according to claim 12, characterized in that: The heat sink is arranged on the upper side of the air suction seat, the air outlet is located on the left and right sides of the air suction seat, and a plurality of heat sinks are radially distributed on the heat dissipation fixing plate with the shaft sleeve as the center.

20. A brushless motor rotor structure, characterized in that: It includes a rotating shaft, a rotor core, a positioning frame, a permanent magnet and a fixing sleeve. The rotor core is arranged outside the rotating shaft, the positioning frame is arranged outside the rotor core, the permanent magnet is arranged outside the positioning frame, and the fixing sleeve is arranged outside the permanent magnet.

21. A brushless motor rotor structure according to claim 20, characterized in that: The positioning frame is provided with a plurality of spacing bars, adjacent spacing bars form a spacing cavity, and the permanent magnet is arranged in the spacing cavity.

22. The brushless motor rotor structure according to claim 20, characterized in that: The positioning frame is provided with a rotor core mounting hole, the rotor core mounting hole is provided with a plurality of clamping grooves, and the rotor core is provided with clamping protrusions adapted to the clamping grooves.

23. The brushless motor rotor structure according to claim 20, characterized in that: It also includes a limiting seat, and at least one pair of the limiting seats is provided. The one pair of limiting seats is respectively provided at two ends of the rotor core, and the one pair of limiting seats is respectively provided in contact with the permanent magnet.

24. The brushless motor rotor structure according to claim 20, characterized in that: The outer surface of the positioning frame is fitted with the inner surface of the permanent magnet, and the inner surface of the fixing sleeve is fitted with the outer surface of the permanent magnet.

25. The brushless motor rotor structure according to claim 21, characterized in that: The partition cavities correspond to the permanent magnets one by one, and one permanent magnet is arranged in one partition cavity.

26. The brushless motor rotor structure according to claim 20, characterized in that: A cavity is formed between the adjacent permanent magnets and the fixing sleeves, and an adhesive is arranged in the cavity to fix the permanent magnet and the fixing sleeve, and the cavity is located on the side of the permanent magnet.

27. The brushless motor rotor structure according to claim 20, characterized in that: The rotor core comprises protrusions, the protrusions are located at two ends of the rotor core, a positioning frame is arranged between the two protrusions, and the protrusions are arranged in close contact with the two ends of the positioning frame.

28. The brushless motor rotor structure according to claim 20, characterized in that: A plurality of permanent magnets are arranged in a ring shape outside the positioning frame.

29. The brushless motor rotor structure according to claim 20, characterized in that: The central axes of the rotating shaft, the rotor core and the positioning frame are collinear or approximately collinear, the length direction of the spacer bar is parallel to the axial direction of the positioning frame, the length of the spacer bar matches the length of the permanent magnet, and the fixing sleeve is set to be a seamless steel pipe.

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