A motor heat dissipation structure and a frameless torque motor

Abstract

The present invention discloses a motor heat dissipation structure and a frameless torque motor, which include a stator assembly and a rotor assembly axially arranged with respect to the stator assembly; the rotor assembly includes a rotor bracket and a plurality of magnetic blocks, a circular ring groove is formed on the rotor bracket, each of the magnetic blocks is respectively embedded in the circular ring groove, an annular air duct is arranged on the rotor bracket, a radial air duct is arranged between adjacent magnetic blocks, each of the radial air ducts is respectively communicated with the annular air duct, and a ventilation notch is formed on the rotor bracket, and the ventilation notch is communicated with the radial air duct; the stator assembly includes a stator bracket and a potting insulation structure, the potting insulation structure is arranged on the stator bracket, and a plurality of axial air ducts are formed on the potting insulation structure, and each of the axial air ducts is respectively communicated with the annular air duct. The motor heat dissipation structure and the frameless torque motor of the present invention can solve the problems of low heat dissipation efficiency and defective air duct design of traditional motors.

Description

Technical Field

[0001] The present invention relates to the field of frameless torque motors, and particularly to a motor heat dissipation structure and a frameless torque motor. Background Art

[0002] Traditional axial frameless torque motor designs rely on passive heat conduction of potting materials (the thermal conductivity of epoxy resin ≤ 1 W / m·K) or forced heat dissipation by external fans, resulting in local temperature rise of the rotor magnetic tiles > 50°C (exceeding 120°C under peak operating conditions), leading to the risk of permanent magnet demagnetization; and the heat generated by the copper loss of the stator winding accumulates, with a temperature rise gradient of 10 - 15°C / min, requiring derating operation. Additionally, a single axial or radial air duct cannot form an effective air flow cycle, and the heat dissipation non-uniformity coefficient > 0.3 (the ideal value < 0.15); external fans increase the volume and are prone to failure, conflicting with the compact design goal of frameless motors. Summary of the Invention

[0003] An object of the present invention is to overcome the deficiencies in the prior art and provide a motor heat dissipation structure and a frameless torque motor to solve the problems of low heat dissipation efficiency and air duct design defects in traditional motors.

[0004] The object of the present invention is achieved through the following technical solutions:

[0005] A motor heat dissipation structure, comprising: a stator assembly and a rotor assembly axially arranged with respect to the stator assembly;

[0006] The rotor assembly includes a rotor bracket and a plurality of magnetic blocks. A circular ring groove is formed on the rotor bracket, and each of the magnetic blocks is respectively embedded in the circular ring groove. An annular air duct is provided on the rotor bracket, a radial air duct is provided between adjacent magnetic blocks, each of the radial air ducts is respectively communicated with the annular air duct, and a ventilation notch is formed on the rotor bracket, and the ventilation notch is communicated with the radial air duct;

[0007] The stator assembly includes a stator bracket and a potting insulation structure. The potting insulation structure is arranged on the stator bracket, and a plurality of axial air ducts are formed on the potting insulation structure, and each of the axial air ducts is respectively communicated with the annular air duct.

[0008] In one embodiment, a plurality of ventilation notches are provided, each ventilation notch is located between two magnetic blocks, and each ventilation notch is respectively and correspondingly communicated with the radial channel.

[0009] In one embodiment, an inner ring structure is provided on the rotor bracket, and the magnetic blocks and the inner ring structure of the rotor bracket together enclose an annular air duct.

[0010] In one embodiment, an inner ring structure is provided on the rotor bracket, and an annular air duct is provided on the inner ring structure. The annular air duct communicates with each of the radial air ducts and each of the axial air ducts.

[0011] In one embodiment, an air duct notch is formed on the inner ring structure, and the annular air duct communicates with the radial air duct through the air duct notch.

[0012] In one embodiment, the stator assembly further includes a plurality of stator windings. Each of the stator windings is respectively installed on the stator bracket, and each of the stator windings is respectively wrapped in the potting insulation structure.

[0013] In one embodiment, the stator assembly further includes an annular radiator, and the annular radiator is embedded in the potting insulation structure.

[0014] In one embodiment, the annular radiator includes a heat dissipation ring and a plurality of heat dissipation fins. Each of the heat dissipation fins is respectively arranged on the heat dissipation ring, and one heat dissipation fin is arranged between every two of the stator windings.

[0015] In one embodiment, the heat dissipation fin has an injection molding part and an exposed part. The injection molding part of the heat dissipation fin is wrapped in the potting insulation structure, and the exposed part of the heat dissipation fin is exposed on the potting insulation structure.

[0016] The present invention also provides a frameless torque motor, including the motor heat dissipation structure as described above.

[0017] The advantages and beneficial effects of the present invention compared with the prior art are as follows:

[0018] 1. The present invention provides a motor heat dissipation structure and a frameless torque motor. By providing an annular passage and a radial air duct communicating with the annular air duct on the rotor bracket, the centrifugal force can be used to drive the active circulation of air, solving the problem of low passive heat dissipation efficiency. And by providing an axial channel in the stator assembly, a closed-loop air flow of "axial supply - annular negative pressure suction - radial ejection" can be formed, improving the heat dissipation uniformity.

[0019] 2. The present invention provides a radial air duct between adjacent two magnetic pieces, an annular air duct inside the magnetic pieces, and an axial air duct at the stator potting insulation structure. The three air ducts form a complete passage. When the rotor rotates, under the action of centrifugal force, the air is ejected from the rotor radial air duct, a negative pressure is formed in the rotor annular air duct and the air is sucked from the axial air duct inside the stator, and the heat dissipation of the rotor magnetic pieces and the stator surface is realized through the high-speed flowing air.

[0020] 3. A heat dissipation fin is arranged between every two stator windings of the present invention, that is, a highly thermally conductive metal heat dissipation fin is embedded in the gap between the stator windings to establish an efficient heat conduction path, which can reduce the temperature rise of the windings and further improve the heat dissipation effect. A metal heat dissipation fin is inserted into the gap between two adjacent motor stator windings, and each heat dissipation fin is connected to the metal heat dissipation ring outside the stator winding. Through potting, the ring with fins and the stator winding form a stator assembly. The fins and the ring can quickly conduct the heat generated by the winding to the outside of the stator, thereby reducing the temperature of the stator coil. Description of the Drawings

[0021] Figure 1 Schematic structural diagram of the motor heat dissipation structure according to an embodiment of the present invention;

[0022] Figure 2 is Figure 1 Schematic structural diagram of the rotor assembly of the motor heat dissipation structure shown;

[0023] Figure 3 is Figure 2 Schematic structural diagram of the rotor assembly of the motor heat dissipation structure shown;

[0024] Figure 4 is Figure 3 Enlarged structural diagram of the rotor assembly shown at C;

[0025] Figure 5 is Figure 1 Schematic overall structural diagram of the motor heat dissipation structure shown;

[0026] Figure 6 is Figure 5 Cross-sectional view of the motor heat dissipation structure shown at the B-B tangent;

[0027] Figure 7 is Figure 5 Cross-sectional view of the motor heat dissipation structure shown at the A-A tangent;

[0028] Figure 8 is Figure 7 Enlarged structural diagram of the motor heat dissipation structure shown at D;

[0029] Figure 9 is Figure 1 Schematic structural diagram of the stator assembly of the motor heat dissipation structure shown;

[0030] Figure 10 is Figure 1 Schematic structural diagram of the annular radiator of the motor heat dissipation structure shown;

[0031] Figure 11 is Figure 10 Partially enlarged view of the annular radiator shown;

[0032] Figure 12 for Figure 9 A schematic diagram of the structure of the stator winding of the stator assembly shown;

[0033] Figure 13 for Figure 12 A cross-sectional view of the stator winding is shown;

[0034] Figure 14 for Figure 1 A schematic diagram of the structure of the output drive assembly of the motor heat dissipation structure shown;

[0035] The reference numerals are as follows:

[0036] 100, stator assembly; 110, stator bracket; 120, glue-filled insulation structure; 121, axial air duct; 130, stator winding; 131, upper support plate; 132, lower support plate; 133, stator teeth; 134, limiting column; 135, winding coil; 136, fixing through hole; 140, annular radiator; 141, heat dissipation ring; 142, heat dissipation fin; 142a, injection molding part; 142b, exposed Part; 142c, connecting part; 200, rotor assembly; 210, rotor bracket; 211, annular groove; 212, ventilation gap; 213, inner ring structure; 220, magnetic block; 221, annular air duct; 222, radial air duct; 300, output drive assembly; 310, inner rotating bearing; 320, internal gear structure; 330, driving gear; 331, fixing frame; 332, driving wheel; 333, driven wheel. DETAILED DESCRIPTION

[0037] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0038] It is understandable that traditional axial frameless torque motors rely on passive heat dissipation or forced heat dissipation by external fans, resulting in low heat dissipation efficiency and complex structure. Heat easily accumulates in the rotor magnetic sheet and stator winding area, causing excessive temperature rise, affecting the motor output torque and life. The stator part lacks an effective heat conduction structure and mainly relies on the potting material for heat conduction, but the potting material has a low thermal conductivity (usually ≤1W / m•K), and cannot promptly conduct the heat generated by the winding copper loss and iron loss. The traditional air duct design is single and cannot form effective convection, resulting in uneven heat dissipation. The local temperature of the rotor magnetic sheet can reach above 120°C.

[0039] Based on this, the present invention provides a motor heat dissipation structure and a frameless torque motor. Specifically, please refer to Figure 1, the motor heat dissipation structure includes a stator assembly 100 and a rotor assembly 200 axially arranged with the stator assembly 100;

[0040] Please refer to Figures 1 to 6 , the rotor assembly 200 includes a rotor bracket 210 and a plurality of magnetic blocks 220. A circular groove 211 is formed on the rotor bracket 210, and each of the magnetic blocks 220 is respectively embedded in the circular groove 211. An annular air duct 221 is arranged on the rotor bracket 210, and a radial air duct 222 is arranged between adjacent magnetic blocks 220. Each of the radial air ducts 222 is communicated with the annular air duct 221, and a ventilation notch 212 is formed on the rotor bracket 210, and the ventilation notch 212 is communicated with the radial air duct 222; it should be noted that the rotor bracket 210 serves as a mechanical support structure of the rotor assembly 200, on which a circular groove 211 is formed for embedding the magnetic blocks 220, and an annular air duct 221 and a radial air duct 222 are designed. The annular air duct 221 extends along the circumferential direction of the rotor bracket 210 to provide a circumferential flow path for air; the radial air duct 222 is perpendicular to the annular air duct 221 and communicates with the ventilation notch 212 to form an outlet for air flow in the radial direction of the rotor bracket 210. A plurality of magnetic blocks 220 are evenly embedded in the circular groove 211 to form the magnetic field of the rotor. The gap between adjacent magnetic blocks 220 is connected to the radial air duct 222, so that air can directly act on the surface of the magnetic blocks 220 to achieve efficient heat dissipation. The ventilation notch 212 is used to suck in the air at the ventilation notch 212 under the action of centrifugal force when the rotor rotates, and the air is thrown out through the radial air duct 222 to form a continuous air flow cycle.

[0041] Please refer to Figures 7 to 9, the stator assembly 100 includes a stator bracket 110 and a potting insulation structure 120. The potting insulation structure 120 is disposed on the stator bracket 110, and a plurality of axial air ducts 121 are formed in the potting insulation structure 120. Each of the axial air ducts 121 is respectively communicated with the annular air duct 221. The stator bracket 110 is provided with the potting insulation structure 120 for fixing the stator winding 130 and providing electrical insulation; it is formed on the stator bracket 110 by a potting process, and a plurality of axial air ducts 121 are formed thereon. These air ducts extend along the axial direction of the stator bracket 110 and are communicated with the annular air duct 221 of the rotor assembly 200 to form a supply channel for air flow. When the rotor rotates, the air at the ventilation notch 212 is sucked in under the action of centrifugal force and is discharged to the outside of the motor through the radial air duct 222. At the same time, a negative pressure is formed in the annular air duct 221, attracting the air in the axial air ducts 121 of the stator assembly 100 to flow in, forming a continuous air flow cycle. The high-speed flowing air directly acts on the magnet 220 and the stator surface, and takes away heat through forced convection heat transfer to achieve efficient heat dissipation. Further, the radial air duct 222 and the annular air duct 221 form a centrifugal pump effect, and the axial air duct 121 serves as a supplementary air flow inlet. The three are matched through fluid dynamics to achieve self-driven circulation. In this embodiment, the axial air ducts 121 are arranged in a ring shape, so as to be communicated with the annular air duct 221.

[0042] Thus, by providing an annular passage and a radial air duct 222 communicated with the annular air duct 221 on the rotor bracket 210, the centrifugal force can be utilized to drive the active circulation of air, solving the problem of low efficiency of passive heat dissipation. And by providing an axial channel in the stator assembly 100, a closed-loop air flow of "axial supply - annular negative pressure suction - radial discharge" can be formed, improving the heat dissipation uniformity. And in the present invention, a radial air duct 222 is provided between two adjacent magnetic sheets, an annular air duct 221 is provided inside the magnetic sheet, and an axial air duct 121 is provided at the stator potting insulation structure 120. The three air ducts form a complete passage. When the rotor rotates, under the action of centrifugal force, the air is discharged from the rotor radial air duct 222, a negative pressure is formed in the rotor annular air duct 221 and the air is sucked from the axial air duct 121 inside the stator, and the heat dissipation of the rotor magnetic sheet and the stator surface is realized through the high-speed flowing air.

[0043] This motor realizes the active circulation of air and efficient heat dissipation, significantly improving the heat dissipation uniformity and overall heat dissipation efficiency of the motor. At the same time, the design of the closed-loop air flow helps to reduce the intrusion of external dust and impurities, improving the reliability and service life of the motor. The centrifugal force generated by the rotation of the rotor is used to drive the active circulation of air, combined with the axial air duct 121 layout of the stator assembly 100, forming a powerful heat dissipation capacity. This helps to reduce the motor temperature and improve the operating efficiency and reliability of the motor. By optimizing the air duct layout and air flow circulation mechanism, uniform heat dissipation of each component inside the motor is achieved. This helps to reduce the performance degradation and shortened service life caused by temperature gradients, improving the overall performance and service life of the motor. The efficient and uniform heat dissipation mechanism helps to reduce the noise and vibration generated by the motor due to overheating, improving the operating stability and comfort of the motor.

[0044] It should be noted that a plurality of ventilation gaps 212 are provided, each ventilation gap 212 is located between two of the magnetic blocks 220, and each ventilation gap 212 corresponds to and communicates with the radial channel respectively. In this way, by setting the cooperation of a plurality of ventilation gaps 212 and the radial channel, the air flow rate inside the rotor is effectively increased. During the air flow process, the heat generated by components such as the magnetic blocks 220 and the rotor winding can be carried away, reducing the temperature of the rotor and improving the heat dissipation performance of the rotor. Through the uniform distribution of a plurality of ventilation gaps 212 and the radial channel, the air can flow more uniformly inside the rotor, so that the temperature distribution of each part of the rotor is more uniform. The occurrence of local overheating is avoided, improving the overall performance and stability of the rotor.

[0045] In this embodiment, an inner ring structure 213 is provided on the rotor bracket 210, and the magnetic blocks 220 and the inner ring structure 213 of the rotor bracket 210 together enclose an annular air duct 221. In this way, the annular air duct 221 enclosed by the inner ring structure 213 of the rotor bracket 210 and the magnetic blocks 220 provides a closed channel for the air flow. The design of the annular air duct 221 enables the air to form a circulating flow system inside the rotor, further enhancing the heat dissipation effect of the air. At the same time, the annular air duct 221 can also guide the air to flow along a specific direction, improving the utilization efficiency of the air.

[0046] In addition, the communication design of the annular air duct 221 with the radial air duct 222 and the axial air duct 121 greatly increases the air flow rate inside the rotor. The air forms a stable flow in the annular air duct 221, quickly enters the radial air duct 222, and then the air flow or air is supplemented by the axial air duct 121, forming an all-round and multi-level heat dissipation system. In this way, the heat generated by each component of the rotor and the stator can be effectively carried away, reducing the temperature of the rotor and improving the thermal stability and reliability of the rotor.

[0047] In another embodiment, an inner ring structure 213 is provided on the rotor bracket 210. A circular air duct 221 is provided on the inner ring structure 213. The circular air duct 221 communicates with each of the radial air ducts 222 and each of the axial air ducts 121. An air duct notch is formed on the inner ring structure 213. The circular air duct 221 communicates with the radial air duct 222 through the air duct notch. In this way, the inner ring structure 213 and the rotor bracket 210 are an integrally formed structure, and a separate circular air duct 221 is provided on the inner ring structure 213. Air forms a certain pressure distribution in the circular air duct 221, enters the radial air duct 222 through the air duct notch, and is then discharged from the radial air duct 222 through the ventilation notch 212 on the rotor bracket 210. At the same time, since the axial air duct 121 and the circular air duct 221 communicate, air can be radially supplemented from the axial air duct 121 to realize the circulating flow of air inside the rotor.

[0048] Through the air duct layout of the present application, air can be evenly distributed inside the rotor to uniformly cool each part of the rotor. The occurrence of local overheating is avoided, the service life of components such as the stator winding and the magnet block 220 is prolonged, and the overall performance of the rotor is improved. The air duct design of the present invention can guide the smooth flow of air, reduce the turbulence and eddy current during the air flow process, reduce the noise generated by the air flow, and improve the stability and reliability of the rotor during operation.

[0049] Please refer to Figure 9 and Figure 12 As shown in, the stator assembly 100 further includes a plurality of stator windings 130. Each of the stator windings 130 is respectively installed on the stator bracket 110, and each of the stator windings 130 is respectively wrapped in the potting insulation structure 120. In this way, the potting insulation structure 120 is formed by a potting process after the stator winding 130 is installed on the stator bracket 110. During the potting process, the potting material will evenly fill the gap between the stator winding 130 and the stator bracket 110, as well as the gaps within the stator winding 130 itself, completely wrapping the stator winding 130.

[0050] Please refer to Figure 10 and Figure 11, the stator assembly 100 also includes an annular radiator 140, and the annular radiator 140 is embedded in the glue-potted insulating structure 120. In the present embodiment, the annular radiator 140 includes a heat dissipation ring 141 and a plurality of heat dissipation fins 142, each of the heat dissipation fins 142 is respectively arranged on the heat dissipation ring 141, and a heat dissipation fin 142 is arranged between every two stator windings 130. Preferably, the heat dissipation ring 141 is a metal heat dissipation ring 141; the heat dissipation fins 142 are metal heat dissipation fins 142, and aluminum material can be selected as the heat dissipation material. It should be noted that the annular radiator 140 is embedded in the glue-potted insulating structure 120 as a whole. The heat dissipation ring 141 serves as the basic frame of the annular radiator 140, and its outer edge is in close contact with the glue-potted insulating structure 120. In the heat dissipation fin 142, the injection molding part 142a is completely wrapped by the potting material, forming a whole with the potting insulation structure 120; the exposed part 142b is exposed on the surface of the potting insulation structure 120. The heat dissipation fin 142 is fixed to the heat dissipation ring 141 by mechanical connection methods such as welding and riveting. The heat dissipation ring 141 can ensure that the heat dissipation fin 142 can be stably distributed between the stator windings 130. A heat dissipation fin 142 is arranged between every two stator windings 130, and a certain gap is maintained between the heat dissipation fin 142 and the stator winding 130. This layout enables the heat dissipation fin 142 to directly act on the potting material around the stator winding 130 to promote heat dissipation. In addition, it should be noted that the stator part pre-embeds the metal heat-conducting fin in the winding gap and connects it to the outer surface. The surface of the heat dissipation fin 142 can be designed with micro grooves to further increase the contact area and improve the thermal conductivity efficiency.

[0051] The heat generated by the stator winding 130 during operation is first transferred to the adjacent heat dissipation fins 142 by means of heat conduction. The heat dissipation fins 142 act as a bridge for heat transfer, transferring heat from the stator winding 130 to the heat dissipation ring 141 and the exposed portion 142b of the heat dissipation fins 142, and then performing heat exchange with the external environment through the heat dissipation ring 141 and the exposed portion 142b. The annular radiator 140 composed of the heat dissipation ring 141 and the heat dissipation fins 142 not only provides an additional heat dissipation channel for the stator winding 130, but also plays a certain protective role for the stator winding 130. It should also be noted that the heat dissipation ring 141 is exposed on the outer surface of the glue-filled insulation structure 120, so when heat dissipation is required, the heat of the heat dissipation fins 142 can also be dissipated through the heat dissipation ring 141.

[0052] For further information, see Figure 10 and Figure 11, the heat dissipation fin 142 has an injection molding portion 142a and an exposed portion 142b. The injection molding portion 142a of the heat dissipation fin 142 is wrapped within the potting insulation structure 120, and the exposed portion 142b of the heat dissipation fin 142 is exposed on the potting insulation structure 120. In this way, the exposed portion 142b of the heat dissipation fin 142 is exposed on the surface of the potting insulation structure 120, increasing the heat dissipation area. When the motor operates, air flows around the heat dissipation fin 142, taking away the heat on the heat dissipation fin 142.

[0053] It should also be noted that the heat dissipation fin 142 further includes a connecting portion 142c. The connecting portion 142c is provided on the injection molding portion 142a and is mounted on the heat dissipation ring 141. An intermediate fixing cavity and a mounting groove are formed on the potting insulation structure 120. The intermediate fixing cavity is used to accommodate the heat dissipation fin 142, and the heat dissipation ring 141 is embedded in the mounting groove. In this way, by providing the connecting portion 142c, the heat dissipation fin 142 can be stably mounted on the heat dissipation ring 141. The intermediate fixing cavity can ensure that the heat dissipation fin 142 can be accurately embedded therein. During the potting process, the insulating glue will evenly fill the gap between the heat dissipation fin 142 and the intermediate fixing cavity, forming a solid insulating layer, which not only protects the heat dissipation fin 142 from the external environment but also enhances the electrical insulation performance of the entire heat dissipation system. After the heat dissipation ring 141 is embedded in the mounting groove, the stable installation of the heat dissipation ring 141 can be guaranteed.

[0054] Further, please refer to Figure 12 and Figure 13, in one of the stator windings 130, the stator winding 130 includes an upper support sheet 131, a lower support sheet 132, stator teeth 133, a limiting column 134 and a winding coil 135. The limiting column 134 is disposed on the lower support sheet 132, and an accommodation cavity is formed in the limiting column 134. The stator teeth 133 are received in the accommodation cavity. The upper support sheet 131 covers the accommodation cavity. The winding coil 135 is wound around the outside of the limiting column 134. And the stator winding 130 is provided with a fixing through hole 136 from top to bottom. The fixing through hole 136 penetrates through the upper support sheet 131, the stator teeth 133 and the lower support sheet 132. Fixing screws or fixing bolts can be arranged in the fixing through hole 136 to fix the entire stator winding 130, and it can also be integrally fixed in the potting insulation structure 120. It should be noted that the limiting column 134 is vertically disposed on the upper surface of the lower support sheet 132, and the two are firmly connected by means of integral molding, welding or mechanical fastening to ensure the stability and perpendicularity of the limiting column 134. The upper support sheet 131 covers the upper end surface of the limiting column 134 by covering, forming a closed structure with the limiting column 134. The lower support sheet 132 provides a stable support base for the limiting column 134 to ensure that the limiting column 134 does not shake or tilt during the operation of the motor. The upper support sheet 131 can also play a certain protective role for the winding coil 135 to prevent the winding coil 135 from being mechanically damaged or electrically broken down during the operation of the motor. The winding coil 135 forms a magnetic field circuit of the motor by being tightly wound around the outer surface of the limiting column 134. The fixing through hole 136 tightly fixes the upper support sheet 131, the stator teeth 133 and the lower support sheet 132 together by arranging fixing screws or fixing bolts to form an integral structure, which can reduce friction and wear, improve the operation efficiency and reliability of the motor; it can also improve the rigidity and stability of the stator winding 130 and reduce the vibration and noise during the operation of the motor. Thus, through the combined design of the lower support sheet 132, the limiting column 134 and the upper support sheet 131, the stator winding 130 forms a stable structural framework and can withstand various forces and torques generated during the operation of the motor. The arrangement of the fixing through hole 136 and the fixing screws / bolts further enhances the overall stability of the stator winding 130 to ensure that the structure of the motor does not deform or damage during long-term operation.

[0055] Further, please refer to Figure 14, the motor heat dissipation structure further includes an output drive assembly 300. The output drive assembly 300 includes an inner rotating bearing 310, an internal gear structure 320, and a drive gear unit 330. The inner rotating bearing 310 and the internal gear structure 320 are respectively arranged on the stator bracket 110, and the inner rotating bearing 310 and the internal gear structure 320 are axially arranged. The internal gear structure 320 is in mating connection with the drive gear unit 330. The drive gear unit 330 includes a fixing frame 331, a driving wheel 332, and a plurality of driven wheels 333. The driving wheel 332 is sleeved on the rotor bracket 210. Each of the driven wheels 333 is respectively meshed with the driving wheel 332, and each of the driven wheels 333 is also respectively meshed with the internal gear structure 320. A plurality of fixing columns are arranged on the fixing frame 331, and each of the driven wheels 333 is respectively sleeved on the corresponding fixing column. It should be noted that the inner rotating bearing 310 is installed between the stator bracket 110 and the rotor bracket 210, and it cooperates with the rotor bracket 210 to facilitate the inner rotation of the rotor. The axis of the inner rotating bearing 310, the stator bracket 110, and the axis of the rotor bracket 210 coincide, ensuring that the rotor can maintain a high degree of concentricity and stability during rotation. The driven wheels 333 in the drive gear unit 330 are meshed with the internal gear structure 320 to form a gear transmission system. The driving wheel 332 is sleeved on the rotor bracket 210 and rotates with the rotation of the rotor. The driven wheels 333 are sleeved on the fixing columns on the fixing frame 331 through bearings to achieve free rotation. The number of fixing columns on the fixing frame 331 matches the number of driven wheels 333 to ensure that each driven wheel 333 can be stably supported.

[0056] The driving wheel 332 in the drive gear unit 330 is connected to the rotor bracket 210, transmitting the rotational motion of the rotor to the driving wheel 332. Then, through the mating connection between the driving wheel 332 and the driven wheels 333, and the meshing of the driven wheels 333 with the internal gear structure 320, the reduction of speed and the increase of torque are achieved. When the driving wheel 332 rotates, it drives the driven wheels 333 meshed with it to rotate. During the rotation of the driven wheels 333, they are meshed with the internal gear structure 320, further transmitting torque and changing the speed. This multi-stage gear transmission system can effectively convert the high-speed rotational motion of the rotor into a low-speed and high-torque output, meeting the requirements of the motor under different working conditions. It can significantly improve the transmission efficiency of the motor and reduce energy loss. Gear transmission has the advantages of accurate transmission ratio, smooth transmission, and strong load-bearing capacity, making the motor more stable and reliable during operation. Through the combination of gears with different numbers of teeth, the drive gear unit 330 can achieve the reduction of speed and the increase of torque. This function enables the motor to adapt to the requirements under different working conditions. For example, when high speed is required, a gear combination with a small number of teeth is selected, and when high torque is required, a gear combination with a large number of teeth is selected.

[0057] The present invention also provides a frameless torque motor, which includes the motor heat dissipation structure as described above.

[0058] The heat dissipation air duct system of the present invention forms an active air flow through centrifugal force, and the heat dissipation efficiency is more than 3 times higher than that of traditional passive heat dissipation. The temperature of the rotor magnetic sheet can be controlled within 80°C, effectively improving the heat dissipation efficiency. Moreover, the external heat dissipation device is cancelled, and the axial length of the motor is reduced by 15%-20%, which is suitable for robot joints with limited space. The composite heat conduction structure of the aluminum heat dissipation fins and the circular ring improves the heat conduction speed of the stator winding by 40%, avoiding the thermal resistance bottleneck of the potting material; the integrated design of the air duct and the heat conduction structure avoids the heat dissipation failure caused by the fan failure in the traditional design and adapts to the high dynamic working conditions of the robot. When the rotor assembly rotates, under the action of centrifugal force, the air is thrown out from the radial air duct of the rotor bracket; after the air is thrown out, a negative pressure is formed at the annular air duct of the rotor bracket; the negative pressure sucks the air from the axial air duct of the potting. A complete air flow path is formed. The heat dissipation circular ring and the heat dissipation fins are pre-placed at the gaps of the winding assembly during potting. The heat dissipation circular ring is exposed on the outer wall of the motor after potting and forming, and the heat dissipation fins extend from the axial depth at the bottom of the potting to further expand the heat exchange area.

[0059] The above-described embodiments only represent several embodiments of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the appended claims.

Claims

1. A motor heat dissipation structure, characterized in that, Comprising: A stator assembly and a rotor assembly axially arranged with respect to the stator assembly; The rotor assembly includes a rotor bracket and a plurality of magnetic blocks. The rotor bracket is provided with an annular groove, and each of the magnetic blocks is respectively embedded in the annular groove. The rotor bracket is provided with an annular air duct, and a radial air duct is provided between adjacent magnetic blocks. Each of the radial air ducts is respectively communicated with the annular air duct, and the rotor bracket is provided with a ventilation notch, and the ventilation notch is communicated with the radial air duct; The stator assembly includes a stator bracket and a potting insulation structure. The potting insulation structure is arranged on the stator bracket, and a plurality of axial air ducts are provided on the potting insulation structure, and each of the axial air ducts is respectively communicated with the annular air duct; A plurality of ventilation notches are provided, each ventilation notch is located between two of the magnetic blocks, and each ventilation notch is respectively and correspondingly communicated with the radial channel; The radial air duct is perpendicular to the annular air duct. When the rotor rotates, the air at the ventilation notch is sucked in under the action of centrifugal force, and is discharged to the outside of the motor through the radial air duct, and a negative pressure is formed in the annular air duct, attracting the air in the axial air duct of the stator assembly to flow in, forming a continuous air flow cycle; The stator assembly further includes a plurality of stator windings, each of the stator windings is respectively installed on the stator bracket, and each of the stator windings is respectively wrapped in the potting insulation structure; the stator assembly further includes an annular radiator, and the annular radiator is embedded in the potting insulation structure; the annular radiator includes a heat dissipation ring and a plurality of heat dissipation fins, each of the heat dissipation fins is respectively arranged on the heat dissipation ring, and a heat dissipation fin is arranged between every two of the stator windings; In one of the stator windings, the stator winding includes an upper support piece, a lower support piece, a stator tooth, a limiting column body and a winding coil. The limiting column body is arranged on the lower support piece, a receiving cavity is provided in the limiting column body, the stator tooth is received in the receiving cavity, the upper support piece covers the receiving cavity, the winding coil is wound around the outside of the limiting column body, and the stator winding is provided with a fixing through hole from top to bottom, and the fixing through hole penetrates through the upper support piece, the stator tooth and the lower support piece. A fixing screw or a fixing bolt can be arranged in the fixing through hole to realize the fixing of the whole stator winding, and it can also be integrally fixed in the potting insulation structure.

2. The motor heat dissipation structure according to claim 1, wherein The rotor bracket is provided with an inner ring structure, and the magnetic blocks and the inner ring structure of the rotor bracket together enclose an annular air duct.

3. The motor heat dissipation structure according to claim 1, characterized in that, The rotor bracket is provided with an inner ring structure, and an annular air duct is provided on the inner ring structure, and the annular air duct is communicated with each of the radial air ducts and each of the axial air ducts.

4. The motor heat dissipation structure according to claim 3, characterized in that, The inner ring structure is provided with an air duct notch, and the annular air duct is communicated with the radial air duct through the air duct notch.

5. The motor heat dissipation structure according to claim 1, characterized in that, In one of the heat dissipation fins, the heat dissipation fin has an injection molding part and an exposed part. The injection molding part of the heat dissipation fin is wrapped in the potting insulation structure, and the exposed part of the heat dissipation fin is exposed on the potting insulation structure.

6. A frameless torque motor, characterized in that, It includes the motor heat dissipation structure described in any one of claims 1 to 5.

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