Energy-saving brushless direct current motor for yard door machine

Abstract

The application relates to the motor technical field, in particular to an energy-saving brushless direct-current motor for a courtyard door machine, which comprises a shell, a stator assembly installed in the shell and a rotor assembly rotatably installed on the shell, an output end of the shell is provided with a connecting assembly, the connecting assembly comprises a connecting sleeve, the connecting sleeve is arranged at the output end of the shell, two ring grooves are formed in the inner side of the connecting sleeve, extruding pieces are arranged in the two ring grooves, the extruding pieces comprise a plurality of balls, a bottom ring and two elastic rings, the two elastic rings are fixedly connected at the two sides of the bottom ring and connected at the two sides of the ring grooves, and the bottom ring separates a hydraulic space away from the rotor assembly and a limiting space close to the rotor assembly. The application increases the middle supporting bearing, simultaneously sets the stepped buffer structure, effectively reduces the vibration amplitude generated by the shaft rod, reduces the noise, and reduces the abrasion of the internal bearing and the loosening of the connecting piece.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to an energy-saving brushless DC motor for a gate operator. Background Technology

[0002] Brushless DC motors replace the mechanical brushes and commutator structure of traditional brushed DC motors with electronic commutation. They have advantages such as high reliability, no commutation sparks, and low mechanical noise, and are used in the opening and closing control of various electric doors.

[0003] Patent CN104734450B discloses a brushless DC motor, comprising: a housing; a rotating shaft extending in a front-to-back direction and rotatably mounted on the housing around its own axis, the rotating shaft being supported within the housing by two bearings spaced apart from each other along its axial direction, the two bearings being disposed within the housing and respectively abutting against the front and rear side walls of the housing; a rotor assembly disposed within the housing and sleeved on the rotating shaft to drive the rotating shaft to rotate around its own axis; and a seal disposed between the stator assembly and the front or rear side wall of the housing. The aforementioned brushless DC motor has a smaller overall structure, higher production efficiency, and lower cost, reduces vibration and noise, and solves the problem of bearing oil leakage.

[0004] During the opening and closing of motor-controlled doors, whether they are swing doors or sliding doors, the impact when the door starts and stops or uneven tracks will cause random vibration of the motor shaft and torque pulsation of the motor itself. Existing motors cannot effectively reduce the vibration of the shaft, which not only generates noise, but also leads to bearing wear and loosening of connecting parts in the long run. Summary of the Invention

[0005] The purpose of this invention is to solve the problem that the existing technology cannot effectively reduce the vibration of the shaft, which not only causes noise, but also leads to bearing wear and loosening of connecting parts in the long run. Therefore, an energy-saving brushless DC motor for courtyard gate operators is proposed.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An energy-saving brushless DC motor for a gate operator includes: a housing, a stator assembly installed inside the housing, and a rotor assembly rotatably mounted on the housing. The output end of the housing is provided with a connecting assembly, which includes a connecting sleeve. The connecting sleeve is disposed at the output end of the housing and is used to limit the position of the rotor assembly.

[0008] The inner side of the connecting sleeve has two annular grooves, and the two annular grooves are provided with extrusion members. The extrusion members include multiple balls, a bottom ring and two elastic rings. The two elastic rings are symmetrically fixedly connected to both sides of the bottom ring and fixedly connected to both sides of the annular groove. The bottom ring separates the annular groove into a hydraulic space away from the rotor assembly and a limiting space close to the rotor assembly. The multiple balls are rolled inside the limiting space.

[0009] Multiple liquid guiding channels are provided between the two annular grooves, and oil for adjustment is provided between the multiple liquid guiding channels and the two bottom rings.

[0010] Preferably, the rotor assembly includes a shaft, two bearings, and a winding. The winding is fixedly installed in the middle of the shaft, and the two bearings are installed on the shaft and rotatably disposed inside the housing. The shaft is made of high-strength alloy steel and has a wear-resistant layer on its surface.

[0011] Preferably, the connecting assembly further includes multiple connecting blocks, which are fixedly connected in a ring to the end of the outer shell, and the outer sides of the multiple connecting blocks are provided with continuous threaded grooves. The connecting sleeve has a rotating groove in the middle, and the rotating groove is provided with helical teeth. The connecting sleeve engages with the multiple connecting blocks.

[0012] Preferably, the connecting sleeve is internally shaped like a frustum, with the side with the larger opening closer to the outer shell, and the distance between the ball and the shaft on the side closer to the outer shell is greater than the distance between the ball and the rotor assembly on the other side.

[0013] Preferably, the inner wall of the annular groove is set as an arc shape, and the cross-section of the bottom ring is set as a semi-circular arc shape that bends in the same direction as the annular groove. The liquid guiding channel is an arc-shaped channel and is set at the outer edge of the two annular grooves.

[0014] Preferably, a plurality of buffer elements are provided between the two bottom rings, and the buffer elements are disposed inside the liquid guiding channel.

[0015] Preferably, the buffer includes two arc-shaped rods, two elastic seats, and a piston block. The two arc-shaped rods are symmetrically fixedly connected to both ends of the piston block, and the two elastic seats are respectively fixedly connected to the two bottom rings. The arc-shaped rods are connected between the elastic seats and the piston block.

[0016] Preferably, the piston block is provided with multiple throttling holes, which are perforations with small diameters at both ends and large diameters in the middle, and are used for the extrusion and transfer of oil.

[0017] Preferably, a heat dissipation ring is fixedly connected to the side of the rotating groove of the connecting sleeve near the liquid guiding channel. The heat dissipation ring transfers the heat inside the liquid guiding channel. The end of the connecting sleeve away from the outer shell has a plurality of heat dissipation holes in a ring shape that communicate with the rotating groove.

[0018] Preferably, an extrusion layer is fixedly connected to the inner side of the connecting block, and an extrusion sheet is provided on the outer side of the heat dissipation ring. The extrusion layer and the extrusion sheet are made of a material with a high coefficient of friction. Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. The two extrusion components are equivalent to two central support bearings, which can reduce the length of the cantilever and thus reduce the vibration amplitude. When the rotor assembly vibrates during operation, the offset rotor assembly will impact the balls on one side. Multiple balls, while ensuring the rotation of the rotor assembly, will disperse the impact force onto the bottom ring, playing a buffering role. After being impacted, the bottom ring will squeeze oil into the ring groove on the other side. The extrusion component on the other side provides two-stage support for the shaft, thereby ensuring that the impact force generated by the shaft vibration is dispersed and eliminated. By adding central support bearings and setting a stepped buffer structure, this invention effectively reduces the vibration amplitude generated by the shaft, thereby reducing noise and reducing the wear of internal bearings and loosening of connecting parts.

[0020] 2. The threaded sleeve on the connecting block can be freely adjusted in position. The position of the extrusion part can be changed according to the length of the shaft, and the position of the intermediate support bearing formed by the extrusion part can be changed, thereby changing the vibration position of the shaft and reducing the vibration amplitude of the shaft. This can reduce noise and wear for different shafts.

[0021] 3. By setting the inside of the connecting sleeve to a frustum shape, it can be ensured that the shaft first contacts the outer extrusion part, and the outer extrusion part squeezes the oil towards the inner extrusion part, so that the inner extrusion part bears the secondary contact vibration of the shaft, and the vibration is divided into two contact buffers.

[0022] 4. During the movement of the piston block, the oil will flow from the inside of the throttling orifice due to the squeezing action. When the oil passes through multiple throttling orifices, throttling resistance will be generated, so that the buffer and the liquid guiding channel form a small viscous damper, which plays a buffering role and reduces the vibration amplitude generated when the shaft vibrates.

[0023] 5. By setting a heat dissipation ring near the piston block, the generated heat can be absorbed quickly. At the same time, since the shaft is rotating during operation, airflow will be formed on the side of the shaft. By setting multiple heat dissipation holes, the airflow can ensure that the heat around the heat dissipation ring is quickly rotated, avoiding the accumulation of heat.

[0024] 6. When the extruded sheet comes into contact with the extruded layer, the radial force generated by the impact can be offset by the large frictional force, thereby preventing the connecting sleeve from rotating and the connecting sleeve from becoming loose. Attached Figure Description

[0025] Figure 1 This is a front structural schematic diagram of an energy-saving brushless DC motor for a courtyard gate operator proposed in this invention;

[0026] Figure 2 This is a schematic diagram of the unfolded structure of an energy-saving brushless DC motor for a courtyard gate operator proposed in this invention;

[0027] Figure 3 This is a schematic diagram of the cross-sectional structure of a brushless DC motor for an energy-saving courtyard gate operator proposed in this invention;

[0028] Figure 4 This is a schematic diagram of the back structure of the connecting sleeve of an energy-saving brushless DC motor for a courtyard gate operator proposed in this invention;

[0029] Figure 5 This is a schematic diagram of the unfolded structure of the connection assembly of an energy-saving brushless DC motor for a courtyard gate operator proposed in this invention;

[0030] Figure 6 This is a schematic diagram of the extrusion structure of an energy-saving brushless DC motor for a courtyard gate operator proposed in this invention;

[0031] Figure 7 This is a schematic diagram of the cross-sectional structure of the connection component of an energy-saving brushless DC motor for a courtyard gate operator proposed in this invention;

[0032] Figure 8 for Figure 7 Enlarged structural diagram at point A;

[0033] Figure 9 This is a schematic diagram of the buffer structure of a brushless DC motor for an energy-saving courtyard gate operator proposed in this invention.

[0034] In the diagram: 1. Outer shell; 2. Rotor assembly; 21. Shaft; 22. Bearing; 23. Winding; 3. Annular groove; 4. Connecting assembly; 41. Connecting sleeve; 42. Connecting block; 5. Extrusion component; 51. Ball bearing; 52. Bottom ring; 53. Elastic ring; 6. Liquid guiding channel; 7. Buffer component; 71. Arc rod; 72. Elastic seat; 73. Piston block; 8. Throttling orifice; 9. Heat dissipation ring; 10. Heat dissipation hole; 11. Extrusion layer. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0036] The terms used in this invention, such as "upper," "lower," "left," "right," "middle," and "one," are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0037] Reference Figures 1-9 An energy-saving brushless DC motor for a courtyard gate includes: a housing 1, a stator assembly installed inside the housing 1, and a rotor assembly 2 rotatably mounted on the housing 1. The output end of the housing 1 is provided with a connecting assembly 4, which includes a connecting sleeve 41. The connecting sleeve 41 is provided at the output end of the housing 1 and is used to limit the position of the rotor assembly 2.

[0038] The inner side of the connecting sleeve 41 has two annular grooves 3, and the two annular grooves 3 are provided with extrusion members 5. The extrusion members 5 include multiple balls 51, a bottom ring 52 and two elastic rings 53. The two elastic rings 53 are symmetrically fixedly connected to both sides of the bottom ring 52 and the two elastic rings 53 are fixedly connected to both sides of the annular grooves 3. The bottom ring 52 separates the annular grooves 3 into a hydraulic space away from the rotor assembly 2 and a limiting space close to the rotor assembly 2. The multiple balls 51 are rolled inside the limiting space.

[0039] Multiple liquid guiding channels 6 are provided between the two annular grooves 3, and oil for adjustment is provided between the multiple liquid guiding channels 6 and the two bottom rings 52.

[0040] In the embodiment of the above technical solution, by setting two extrusion members 5 at the output end of the rotor assembly 2, the two extrusion members 5 are equivalent to two central support bearings 22, which can reduce the length of the cantilever and thus reduce the amplitude of vibration. When the rotor assembly 2 vibrates during operation, the offset rotor assembly 2 will impact the ball 51 on one side. While ensuring the rotation of the rotor assembly 2, the multiple balls 51 will disperse the impact force onto the bottom ring 52, which will play a buffering role. After being impacted, the bottom ring 52 will squeeze the oil inside the hydraulic space and squeeze the oil into the annular groove 3 on the other side, pushing the ball 51 inside the annular groove 3 on the other side outward and fixing it. The extrusion members 5 on the other side provide two-stage support for the shaft 21, thereby ensuring that the impact force generated by the vibration of the shaft 21 is dispersed and eliminated.

[0041] The bottom ring 52 is connected by two elastic rings 53. After being deformed by impact, it can be reset by the elastic rings 53, thereby ensuring the position of the internal ball 51. At the same time, the replacement and disassembly of the elastic rings 53 is more convenient and faster than the replacement and disassembly of the internal bearing 22.

[0042] By adding a central support bearing 22 and setting a stepped buffer structure, the present invention effectively reduces the vibration amplitude generated by the shaft 21, thereby reducing noise and reducing wear of the internal bearing 22 and loosening of the connecting parts.

[0043] The preferred technical solution in this embodiment is:

[0044] Reference Figure 2-3 The rotor assembly 2 includes a shaft 21, two bearings 22 and a winding 23. The winding 23 is fixedly installed in the middle of the shaft 21. The two bearings 22 are installed on the shaft 21 and are rotatably disposed inside the housing 1. The shaft 21 is made of high-strength alloy steel and has a wear-resistant layer on its surface.

[0045] Since the shaft 21 is subject to external forces during use, it will vibrate under stress. By using high-strength alloy steel, such as 40Cr steel, instead of ordinary carbon steel, the overall fatigue strength of the shaft 21 can be improved. At the same time, by nitriding or shot peening the surface of the shaft 21, a wear-resistant layer is formed on one side, which can enhance wear resistance and resistance to micro-deformation. This can reduce the vibration amplitude generated by the shaft 21 during operation, thereby reducing noise and wear.

[0046] Reference Figure 5-7 The connecting assembly 4 further includes a plurality of connecting blocks 42, which are fixedly connected in a ring to the end of the outer shell 1. The outer side of the plurality of connecting blocks 42 is provided with a continuous threaded groove. The connecting sleeve 41 has a rotating groove in the middle and helical teeth are provided inside the rotating groove. The connecting sleeve 41 is engaged with the plurality of connecting blocks 42.

[0047] The connecting sleeve 41 is internally shaped like a frustum, with the side with the larger opening closer to the outer shell 1. The distance between the ball bearing 51 and the shaft 21 on the side closer to the outer shell 1 is greater than the distance between the ball bearing 51 and the rotor assembly 2 on the other side.

[0048] During use, the motor shaft 21 is connected to an external connector, which can be a lead screw for driving or a rotating rod for driving the belt. The shaft 21 is used for control and drive. However, due to different positions and different required connector lengths, the overall length of the rotating part formed after the connector is connected to the shaft 21 varies. When a lead screw is used as the connector, for easy installation and disassembly, one end of the lead screw is connected to the shaft 21, and the other end is set inside the rotating groove. The two support parts are located on the rotating groove and the shaft 21, respectively. The longer the rotating part is, the greater the amplitude of vibration during use. Therefore, when the length of the rotating part is long, it rotates on multiple connecting blocks 42 through a rotatable connecting sleeve 41, thereby changing the position of the extrusion part 5. The extrusion part 5 adds an intermediate support bearing 22 on the longer rotating part, thereby reducing the cantilever length of the rotating part and suppressing bending vibration.

[0049] Meanwhile, since the shafts 21 of different motors have different lengths, the threaded sleeve that rotates on the connecting block 42 can be freely adjusted in position. The position of the extrusion piece 5 is changed according to the length of the shaft 21, and the position of the intermediate support bearing 22 formed by the extrusion piece 5 is changed, thereby changing the vibration position of the shaft 21 and reducing the vibration amplitude of the shaft 21. This can reduce noise and wear on different shafts 21.

[0050] Furthermore, during the vibration of shaft 21, shaft 21 will first contact the extrusion member 5 on the side away from the outer casing 1 (the extrusion member 5 on this side is the outer side, and the extrusion member 5 on the other side is the inner side). By setting the interior of the connecting sleeve to a frustum shape, it can be ensured that shaft 21 first contacts the outer extrusion member 5. The outer extrusion member 5 squeezes the oil towards the inner extrusion member 5, thereby causing the inner extrusion member 5 to bear the secondary contact vibration of shaft 21. The vibration is divided into two contact buffers. The stepped buffer can effectively disperse the force generated by the vibration into the annular groove 3, thereby reducing the amplitude of the vibration.

[0051] Reference Figure 7-9 The inner wall of the annular groove 3 is set as an arc shape, and the cross section of the bottom ring 52 is set as a semi-circular arc shape that bends in the same direction as the annular groove 3. The liquid guiding channel 6 is an arc-shaped channel and is set on the outer edge of the two annular grooves 3.

[0052] Multiple buffer elements 7 are provided between the two bottom rings 52, and the buffer elements 7 are disposed inside the liquid guiding channel 6;

[0053] The buffer 7 includes two arc-shaped rods 71, two elastic seats 72 and a piston block 73. The two arc-shaped rods 71 ​​are symmetrically fixedly connected to both ends of the piston block 73. The two elastic seats 72 are respectively fixedly connected to the two bottom rings 52. The arc-shaped rods 71 ​​are connected between the elastic seats 72 and the piston block 73.

[0054] The piston block 73 is provided with a plurality of throttling holes 8, which are perforations with small diameters at both ends and large diameters in the middle, and are used for the extrusion and transfer of oil.

[0055] The two annular grooves 3 are connected by the fluid guiding channel 6. When the outer extrusion member 5 is squeezed and impacted, the ball 51 is pushed into the annular groove 3 to achieve a buffering effect. At the same time, the entire bottom ring 52 is offset inside the annular groove 3. The offset bottom ring 52 pushes the oil in the hydraulic space of the annular groove 3 into the nearest fluid guiding channel 6, thereby moving the corresponding position of the inner extrusion member 5 towards the groove opening of the annular groove 3. The inner extrusion member 5 provides two-stage support for the shaft 21. Through the buffering support of the outer extrusion member 5 and the rigid support of the inner extrusion member 5, the vibrating shaft 21 is better buffered.

[0056] When the bottom ring 52 on one side is impacted and moves into the ring groove 3, the bottom ring 52 will drive the nearest arc rod 71 to move into the guide fluid channel 6, thereby pushing the piston block 73 to the other side. During the movement of the piston block 73, the oil will flow from the throttling orifice 8 due to the squeezing effect. When the oil passes through multiple throttling orifices 8, throttling resistance will be generated, thereby forming a small viscous damper with the buffer 7 and the guide fluid channel 6, which plays a buffering role and reduces the vibration amplitude generated when the shaft 21 vibrates.

[0057] Reference Figure 8 A heat dissipation ring 9 is fixedly connected to the rotating groove of the connecting sleeve 41 on the side near the liquid guiding channel 6. The heat dissipation ring 9 transfers the heat inside the liquid guiding channel 6. A plurality of heat dissipation holes 10 communicating with the rotating groove are provided in a ring shape at the end of the connecting sleeve 41 away from the outer shell 1.

[0058] When the buffer 7 performs its buffering function, the viscous damper formed will convert part of the kinetic energy generated by the impact into heat energy. In order to avoid the heat generated from causing high-temperature deformation of the buffer 7 and the shaft 21, a heat dissipation ring 9 is set near the piston block 73 to absorb the heat generated quickly. At the same time, since the shaft 21 is rotating when it is working, air flow will be formed on the side of the shaft 21. By setting multiple heat dissipation holes 10, the air flow can ensure that the heat around the heat dissipation ring 9 is quickly rotated, thus avoiding the accumulation of heat.

[0059] Reference Figure 8 The inner side of the connecting block 42 is fixedly connected to the extrusion layer 11, and the outer side of the heat dissipation ring 9 is provided with an extrusion sheet. The extrusion layer 11 and the extrusion sheet are made of a material with a high coefficient of friction.

[0060] During the contact process, the contact between the rotating shaft 21 and the extruder 5 will generate a radial force on the connecting assembly 4, which will cause the connecting sleeve 41 to rotate on the connecting block 42 and become loose, affecting the force distribution of the extruder 5 and the limiting of the shaft 21.

[0061] When the shaft 21 impacts the extrusion piece 5, it will cause the connecting sleeve 41 to shift. The extrusion piece on the connecting sleeve 41 will come into contact with the extrusion layer 11. When the extrusion piece comes into contact with the extrusion layer 11, the radial force generated by the impact can be offset by a large frictional force (the material with a large friction coefficient can be high-chromium cast iron or resin-based composite materials, etc.), thereby preventing the connecting sleeve 41 from rotating and preventing the position of the connecting sleeve 41 from becoming loose.

[0062] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An energy-saving brushless DC motor for a courtyard gate operator, comprising: The housing (1), the stator assembly installed inside the housing (1) and the rotor assembly (2) rotatably mounted on the housing (1) are characterized in that a connecting assembly (4) is provided at the output end of the housing (1), the connecting assembly (4) including a connecting sleeve (41), the connecting sleeve (41) being provided at the output end of the housing (1) for limiting the position of the rotor assembly (2); The connecting sleeve (41) has two annular grooves (3) on its inner side. An extrusion member (5) is provided inside the two annular grooves (3). The extrusion member (5) includes multiple balls (51), a bottom ring (52) and two elastic rings (53). The two elastic rings (53) are symmetrically fixedly connected to both sides of the bottom ring (52) and fixedly connected to both sides of the annular groove (3). The bottom ring (52) separates the annular groove (3) into a hydraulic space away from the rotor assembly (2) and a limiting space close to the rotor assembly (2). The multiple balls (51) are rolled inside the limiting space. Multiple liquid guiding channels (6) are provided between the two annular grooves (3), and oil for adjustment is provided between the multiple liquid guiding channels (6) and the two bottom rings (52); Multiple buffers (7) are provided between the two bottom rings (52), and the buffers (7) are located inside the liquid guiding channel (6).

2. The energy-saving brushless DC motor for a courtyard gate operator according to claim 1, characterized in that, The rotor assembly (2) includes a shaft (21), two bearings (22) and a winding (23). The winding (23) is fixedly installed in the middle of the shaft (21). The two bearings (22) are installed on the shaft (21) and are rotatably disposed inside the housing (1). The shaft (21) is made of high-strength alloy steel and has a wear-resistant layer on its surface.

3. The energy-saving brushless DC motor for a courtyard gate operator according to claim 1, characterized in that, The connecting assembly (4) further includes multiple connecting blocks (42), which are fixedly connected in a ring to the end of the outer shell (1). The outer side of the multiple connecting blocks (42) is provided with a continuous threaded groove. The middle part of the connecting sleeve (41) is provided with a rotating groove, and the rotating groove is provided with a helical tooth. The connecting sleeve (41) is engaged with the multiple connecting blocks (42).

4. The energy-saving brushless DC motor for a courtyard gate operator according to claim 1, characterized in that, The connecting sleeve (41) is internally shaped like a frustum, with the side with the larger opening close to the outer shell (1). The distance between the ball (51) close to the outer shell (1) and the shaft (21) is greater than the distance between the ball (51) on the other side and the rotor assembly (2).

5. The energy-saving brushless DC motor for a courtyard gate operator according to claim 1, characterized in that, The inner wall of the annular groove (3) is set as an arc shape, and the cross section of the bottom ring (52) is set as a semi-circular arc shape that bends in the same direction as the annular groove (3). The liquid guiding channel (6) is an arc-shaped channel and is set on the outer edge of the two annular grooves (3).

6. The energy-saving brushless DC motor for a courtyard gate operator according to claim 1, characterized in that, The buffer (7) includes two arc-shaped rods (71), two elastic seats (72) and a piston block (73). The two arc-shaped rods (71) are symmetrically fixedly connected to both ends of the piston block (73), and the two elastic seats (72) are respectively fixedly connected to the two bottom rings (52). The arc-shaped rods (71) are connected between the elastic seats (72) and the piston block (73).

7. The energy-saving brushless DC motor for a courtyard gate operator according to claim 6, characterized in that, The piston block (73) is provided with multiple throttling holes (8). The multiple throttling holes (8) are perforations with small diameters at both ends and large diameters in the middle, and are used for the extrusion and transfer of oil.

8. The energy-saving brushless DC motor for a courtyard gate operator according to claim 3, characterized in that, A heat dissipation ring (9) is fixedly connected to the rotating groove of the connecting sleeve (41) on the side near the liquid guiding channel (6). The heat dissipation ring (9) transfers the heat inside the liquid guiding channel (6). The connecting sleeve (41) has a plurality of heat dissipation holes (10) in a ring shape at the end away from the outer shell (1) that communicate with the rotating groove.

9. The energy-saving brushless DC motor for a courtyard gate operator according to claim 8, characterized in that, The inner side of the connecting block (42) is fixedly connected to the extrusion layer (11), and the outer side of the heat dissipation ring (9) is provided with an extrusion sheet. The extrusion layer (11) and the extrusion sheet are made of a material with a high coefficient of friction.

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