Motor heat dissipation structure and frameless torque motor

Abstract

The invention discloses a motor heat dissipation structure and a frameless torque motor. The motor heat dissipation structure comprises a stator assembly and a rotor assembly arranged in the axial direction of the stator assembly. The rotor assembly comprises a rotor support and a plurality of magnetic blocks, an annular groove is formed in the rotor support, the magnetic blocks are embedded in the annular groove, an annular air channel is formed in the rotor support, radial air channels are formed between the adjacent magnetic blocks, the radial air channels are communicated with the annular air channel, and the annular air channel is communicated with the annular air channel. The rotor support is provided with a ventilation gap, and the ventilation gap is communicated with the radial air channel. The stator assembly comprises a stator support and a glue pouring insulation structure, the glue pouring insulation structure is arranged on the stator support, a plurality of axial air channels are formed in the glue pouring insulation structure, and the axial air channels are communicated with the annular air channel. According to the motor heat dissipation structure and the frameless torque motor, the problems of low heat dissipation efficiency and air duct design defects of a traditional motor can be solved.

Description

Technical Field

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

[0002] The traditional axial frameless torque motor design relies on passive heat conduction of potting materials (epoxy resin thermal conductivity ≤ 1W / m·K) or forced heat dissipation by external fans, resulting in a local temperature rise of >50°C (over 120°C under peak conditions) on the rotor magnetic sheet, causing the risk of permanent magnet demagnetization; and the stator winding copper loss heat accumulation, the temperature rise gradient reaches 10-15°C / min, and derating is required. In addition, a single axial or radial air duct cannot form an effective airflow circulation, and the heat dissipation unevenness coefficient is >0.3 (ideal value <0.15); the external fan increases the volume and is prone to failure, which conflicts with the compact design goal of the frameless motor. Summary of the invention

[0003] The purpose 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 of traditional motors.

[0004] The objective of the present invention is achieved through the following technical solutions: A motor heat dissipation structure comprises: a stator assembly and a rotor assembly axially arranged with the stator assembly; The rotor assembly comprises a rotor support and a plurality of magnetic blocks, the rotor support is provided with an annular groove, each of the magnetic blocks is respectively embedded in the annular groove, the rotor support is provided with an annular air duct, radial air ducts are provided between adjacent magnetic blocks, each of the radial air ducts is respectively connected with the annular air duct, and the rotor support is provided with a ventilation gap, the ventilation gap is connected with the radial air duct; The stator assembly comprises a stator bracket and a glue-filled insulating structure, wherein the glue-filled insulating structure is arranged on the stator bracket, and a plurality of axial air ducts are opened on the glue-filled insulating structure, and each of the axial air ducts is communicated with the annular air duct respectively.

[0005] In one of the embodiments, a plurality of ventilation gaps are provided, each of the ventilation gaps is located between two of the magnetic blocks, and each of the ventilation gaps is connected to the radial channel in a one-to-one correspondence.

[0006] In one of the embodiments, an inner ring structure is provided on the rotor support, and each of the magnetic blocks and the inner ring structure of the rotor support together form an annular air duct.

[0007] In one of the embodiments, an inner ring structure is provided on the rotor support, and an annular air duct is provided on the inner ring structure. The annular air duct is connected with each of the radial air ducts and each of the axial air ducts.

[0008] In one of the embodiments, an air duct gap is opened on the inner ring structure, and the annular air duct is connected with the radial air duct through the air duct gap.

[0009] In one of the embodiments, the stator assembly further includes a plurality of stator windings, each of the stator windings is respectively mounted on the stator bracket, and each of the stator windings is respectively wrapped in the glue-filled insulation structure.

[0010] In one of the embodiments, the stator assembly further includes an annular heat sink, and the annular heat sink is embedded in the glue-potted insulation structure.

[0011] In one of the embodiments, the annular heat sink 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 stator windings.

[0012] In one of the embodiments, the heat sink fin has an injection molded portion and an exposed portion, the injection molded portion of the heat sink fin is wrapped in the glue-potted insulating structure, and the exposed portion of the heat sink fin is exposed on the glue-potted insulating structure.

[0013] The present invention also provides a frameless torque motor, comprising the motor heat dissipation structure as described above.

[0014] The advantages and beneficial effects of the present invention compared to the prior art are as follows: 1. The present invention is a motor heat dissipation structure and a frameless torque motor. By arranging an annular passage and a radial air duct connected to the annular air duct on the rotor bracket, centrifugal force can be used to drive the active circulation of air to solve the problem of low passive heat dissipation efficiency. In addition, an axial channel is arranged in the stator assembly to form a closed-loop airflow of "axial supply-annular negative pressure suction-radial discharge" to improve the uniformity of heat dissipation.

[0015] 2. The present invention sets a radial air duct between two adjacent magnetic sheets, a ring air duct inside the magnetic sheet, and an axial air duct at the stator glue-filled insulation structure, and the three air ducts form a complete passage. When the rotor rotates, under the action of centrifugal force, air is thrown out from the radial air duct of the rotor, negative pressure is formed in the rotor ring air duct, and air is sucked from the axial air duct in the stator, and the heat of the rotor magnetic sheet and the stator surface is achieved through the high-speed flowing air.

[0016] 3. The present invention sets a heat dissipation fin between every two stator windings, that is, a high-thermal-conductivity metal heat dissipation fin is pre-buried 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. In the gap between two adjacent motor stator windings, a metal heat dissipation fin is inserted, and each heat dissipation fin is connected to the metal heat dissipation ring outside the stator winding. The ring with the fin and the stator winding form a stator assembly through glue injection. The fin 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a motor heat dissipation structure according to an embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the structure of the rotor assembly of the motor heat dissipation structure shown; Figure 3 for Figure 2 A schematic diagram of the structure of the rotor assembly of the motor heat dissipation structure shown; Figure 4 for Figure 3 An enlarged structural diagram of the rotor assembly at position C is shown; Figure 5 for Figure 1 The overall structural schematic diagram of the motor heat dissipation structure shown; Figure 6 for Figure 5 The cross-sectional view of the motor heat dissipation structure shown is at the BB tangent line; Figure 7 for Figure 5 The cross-sectional view of the motor heat dissipation structure shown is taken at the AA tangent line; Figure 8 for Figure 7 The enlarged structural diagram of the motor heat dissipation structure at D is shown; Fig. 9 for Figure 1 A schematic structural diagram of a stator assembly of a motor heat dissipation structure shown; Fig.10 for Figure 1 A schematic diagram of the structure of the annular radiator of the motor heat dissipation structure shown; Fig.11 for Fig.10 A partial enlarged view of the annular radiator shown; Fig.12 for Fig. 9 A schematic diagram of the structure of the stator winding of the stator assembly shown; Fig.13 for Fig.12 A cross-sectional view of the stator winding is shown; Fig.14 for Figure 1 A schematic diagram of the structure of the output drive assembly of the motor heat dissipation structure shown; The reference numerals are as follows: 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

[0018] 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.

[0019] 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.

[0020] 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; See also Figure 1 to Figure 6The rotor assembly 200 includes a rotor support 210 and a plurality of magnetic blocks 220. The rotor support 210 is provided with an annular groove 211, and each of the magnetic blocks 220 is respectively embedded in the annular groove 211. The rotor support 210 is provided with an annular air duct 221, and radial air ducts 222 are provided between adjacent magnetic blocks 220. Each of the radial air ducts 222 is respectively connected with the annular air duct 221, and a ventilation gap 212 is provided on the rotor support 210, and the ventilation gap 212 is connected with the radial air duct 222. It should be noted that the rotor support 210, as a mechanical support structure of the rotor assembly 200, is provided with an annular groove 211 for embedding the magnetic blocks 220, and is designed with an annular air duct 221 and a radial air duct 222. The annular air duct 221 extends along the circumference of the rotor support 210 to provide a circumferential flow path for the air; the radial air duct 222 is perpendicular to the annular air duct 221 and connected to the ventilation gap 212 to form an air flow outlet in the radial direction of the rotor support 210. Multiple magnetic blocks 220 are evenly embedded in the annular groove 211 to form a magnetic field of the rotor. The gaps between adjacent magnetic blocks 220 are connected to the radial air duct 222, so that the air can directly act on the surface of the magnetic blocks 220 to achieve efficient heat dissipation. The ventilation gap 212 is used to suck the air at the ventilation gap 212 under the action of centrifugal force when the rotor rotates, and throw it out through the radial air duct 222 to form a continuous air flow circulation.

[0021] See also Figure 7~Figure 9The stator assembly 100 includes a stator bracket 110 and a glue-filled insulating structure 120, the glue-filled insulating structure 120 is arranged on the stator bracket 110, and a plurality of axial air ducts 121 are opened on the glue-filled insulating structure 120, and each of the axial air ducts 121 is respectively connected with the annular air duct 221. The stator bracket 110 is provided with a glue-filled insulating structure 120, which is used to fix the stator winding 130 and provide electrical insulation; it is formed on the stator bracket 110 by a glue-filling process, and a plurality of axial air ducts 121 are opened thereon. These air ducts extend along the axial direction of the stator bracket 110, and are connected with the annular air duct 221 of the rotor assembly 200, forming a supply channel for air flow. When the rotor rotates, the air at the ventilation gap 212 is sucked in under the action of centrifugal force, and is thrown out 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, which attracts the air in the axial air duct 121 of the stator assembly 100 to flow in, forming a continuous air flow cycle. The high-speed air flow directly acts on the magnetic block 220 and the stator surface, taking away heat through forced convection heat exchange to achieve efficient heat dissipation. Furthermore, 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 a self-driven cycle. In this embodiment, the axial air duct 121 is arranged in an annular shape, so that it can be connected to the annular air duct 221.

[0022] In this way, by providing an annular passage and a radial air duct 222 connected to the annular air duct 221 on the rotor bracket 210, centrifugal force can be used to drive the active circulation of air to solve the problem of low passive heat dissipation efficiency, and an axial channel is provided in the stator assembly 100 to form a closed-loop airflow of "axial supply-annular negative pressure suction-radial throwing out", thereby improving the uniformity of heat dissipation. In addition, the present invention provides a radial air duct 222 between two adjacent magnetic sheets, an annular air duct 221 on the inner side of the magnetic sheet, and an axial air duct 121 at the stator glue-filled insulation structure 120, and the three air ducts form a complete passage. When the rotor rotates, under the action of centrifugal force, air is thrown out from the radial air duct 222 of the rotor, negative pressure is formed in the rotor annular air duct 221, and air is sucked from the axial air duct 121 in the stator, and heat is dissipated on the rotor magnetic sheet and the surface of the stator by high-speed air flow.

[0023] The motor realizes 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 closed-loop airflow design also helps to reduce the intrusion of external dust and impurities, and improves 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, to form a powerful heat dissipation capacity. This helps to reduce the temperature of the motor and improve the operating efficiency and reliability of the motor. By optimizing the air duct layout and airflow circulation mechanism, uniform heat dissipation of various components inside the motor is achieved. This helps to reduce performance degradation and shortened life due to temperature gradients, and improves the overall performance and service life of the motor. The efficient and uniform heat dissipation mechanism helps to reduce the noise and vibration caused by overheating of the motor, and improves the running stability and comfort of the motor.

[0024] It should be noted that there are multiple ventilation gaps 212, each of which is located between two of the magnetic blocks 220, and each of the ventilation gaps 212 is connected to the radial channel one by one. In this way, by setting a plurality of ventilation gaps 212 and cooperating with the radial channel, the air flow inside the rotor is effectively increased. During the flow of air, it can take away the heat generated by the magnetic blocks 220, rotor windings and other components, reduce the temperature of the rotor, and improve the heat dissipation performance of the rotor. Through the uniform distribution of multiple ventilation gaps 212 and radial channels, the air can achieve a more uniform flow inside the rotor, so that the temperature distribution of various parts of the rotor is more uniform. The occurrence of local overheating is avoided, and the overall performance and stability of the rotor are improved.

[0025] In this embodiment, the rotor support 210 is provided with an inner ring structure 213, and each of the magnetic blocks 220 and the inner ring structure 213 of the rotor support 210 together form an annular air duct 221. In this way, the annular air duct 221 formed by the inner ring structure 213 of the rotor support 210 and the magnetic blocks 220 provides a closed channel for the flow of air. 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 in a specific direction, thereby improving the utilization efficiency of the air.

[0026] In addition, the design of connecting the annular duct 221 with the radial duct 222 and the axial duct 121 greatly increases the air flow inside the rotor. The air forms a stable flow in the annular duct 221, quickly enters the radial duct 222, and then is supplemented by the axial duct 121, forming an all-round, multi-level heat dissipation system. In this way, the heat generated by the various components of the rotor and stator can be effectively removed, the temperature of the rotor can be reduced, and the thermal stability and reliability of the rotor can be improved.

[0027] In another embodiment, the rotor support 210 is provided with an inner ring structure 213, and an annular air duct 221 is provided on the inner ring structure 213, and the annular air duct 221 is connected with each of the radial air ducts 222 and each of the axial air ducts 121. An air duct gap is provided on the inner ring structure 213, and the annular air duct 221 is connected with the radial air duct 222 through the air duct gap. In this way, the inner ring structure 213 and the rotor support 210 are an integrally formed structure, and a separate annular air duct 221 is provided on the inner ring structure 213, and air forms a certain pressure distribution in the annular air duct 221, enters the radial air duct 222 through the air duct gap, and then is discharged from the radial air duct 222 through the ventilation gap 212 on the rotor support 210. At the same time, since the axial air duct 121 and the annular air duct 221 are connected, radial air can be supplemented from the axial air duct 121, and the circulation of air inside the rotor can be realized.

[0028] Through the air duct layout of the present application, the air can be evenly distributed inside the rotor, and all parts of the rotor can be evenly cooled. The occurrence of local overheating is avoided, the service life of components such as the stator winding and the magnetic block 220 is extended, and the overall performance of the rotor is improved. The air duct design of the present invention can guide the air to flow smoothly, reduce turbulence and eddy currents during the air flow process, reduce the noise generated by the air flow, and improve the stability and reliability of the rotor during operation.

[0029] See also Fig. 9 and Fig.12 The stator assembly 100 further includes a plurality of stator windings 130, each of which is mounted on the stator bracket 110, and each of which is wrapped in the glue-filled insulating structure 120. Thus, the glue-filled insulating structure 120 is formed by a glue-filling process after the stator winding 130 is mounted on the stator bracket 110. During the glue-filling process, the glue-filling material will evenly fill the gap between the stator winding 130 and the stator bracket 110, as well as the gap of the stator winding 130 itself, and completely wrap the stator winding 130.

[0030] See also Fig.10 and Fig.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.

[0031] 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.

[0032] For further information, see Fig.10 and Fig.11The heat dissipation fin 142 has an injection molded portion 142a and an exposed portion 142b. The injection molded portion 142a of the heat dissipation fin 142 is wrapped in the glue-filled insulating structure 120, and the exposed portion 142b of the heat dissipation fin 142 is exposed on the glue-filled insulating structure 120. In this way, the exposed portion 142b of the heat dissipation fin 142 is exposed on the surface of the glue-filled insulating structure 120, thereby increasing the heat dissipation area. When the motor is running, air flows around the heat dissipation fin 142, taking away the heat on the heat dissipation fin 142.

[0033] It should also be noted that the heat dissipation fin 142 also includes a connection portion 142c, which is arranged on the injection molding portion 142a, and the connection portion 142c is installed on the heat dissipation ring 141. The glue-filled insulating structure 120 is provided with an intermediate fixed cavity and a mounting groove, and the intermediate fixed 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 connection portion 142c, the heat dissipation fin 142 can be stably installed on the heat dissipation ring 141. The intermediate fixed cavity can ensure that the heat dissipation fin 142 can be accurately embedded therein. During the glue filling process, the insulating glue will evenly fill the gap between the heat dissipation fin 142 and the intermediate fixed cavity to form a solid insulating layer, which not only protects the heat dissipation fin 142 from the influence of the external environment, but also enhances the electrical insulation performance of the entire heat dissipation system. When the heat dissipation ring 141 is embedded in the mounting groove, the stable installation of the heat dissipation ring 141 can be guaranteed.

[0034] For further information, see Fig.12 and Fig.13In one of the stator windings 130, the stator winding 130 includes an upper support plate 131, a lower support plate 132, a stator tooth 133, a limiting column 134 and a winding coil 135. The limiting column 134 is arranged on the lower support plate 132, and a receiving cavity is opened in the limiting column 134. The stator tooth 133 is received in the receiving cavity. The upper support plate 131 is covered on the receiving cavity. The winding coil 135 is wound around the limiting column 134. The stator winding 130 is provided with a fixing through hole 136 from top to bottom. The fixing through hole 136 passes through the upper support plate 131, the stator tooth 133 and the lower support plate 132. A fixing screw or a fixing bolt can be set in the fixing through hole 136 to fix the entire stator winding 130, and the stator winding 130 can also be fixed as a whole in the glue-filled insulation structure 120. It should be noted that the limiting column 134 is vertically arranged on the upper surface of the lower support sheet 132, and the two are firmly connected by means of one-piece molding, welding or mechanical fastening, so as to ensure the stability and verticality of the limiting column 134. The upper support sheet 131 covers the upper end surface of the limiting column 134 by means of a cover, and forms a closed structure with the limiting column 134. The lower support sheet 132 provides a stable support base for the limiting column 134, ensuring that the limiting column 134 will not shake or tilt during the operation of the motor. The upper support sheet 131 can also provide a certain degree of protection for the winding coil 135, preventing the winding coil 135 from being mechanically damaged or electrically broken down during the operation of the motor. The winding coil 135 is tightly wound on the outer surface of the limiting column 134 to form a magnetic field loop of the motor. The fixing through hole 136 is provided with fixing screws or fixing bolts to tightly fix the upper support plate 131, the stator teeth 133 and the lower support plate 132 together to form an integral structure, which can reduce friction and wear and improve the operating 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. In this way, through the combined design of the lower support plate 132, the limiting column 134 and the upper support plate 131, the stator winding 130 forms a stable structural frame that can withstand various forces and torques generated during the operation of the motor. The provision of the fixing through hole 136 and the fixing screws / bolts further enhances the overall stability of the stator winding 130, ensuring that the motor will not be structurally deformed or damaged during long-term operation.

[0035] For further information, see Fig.14The motor heat dissipation structure also includes an output drive component 300, which includes an inner rotation bearing 310, an inner tooth structure 320 and a driving gear 330. The inner rotation bearing 310 and the inner tooth structure 320 are respectively arranged on the stator bracket 110, and the inner rotation bearing 310 and the inner tooth structure 320 are axially arranged, and the inner tooth structure 320 is matched and connected with the driving gear 330; the driving gear 330 includes a fixed 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 inner tooth structure 320, and a plurality of fixing columns are arranged on the fixed frame 331, and each of the driven wheels 333 is respectively sleeved on the fixing columns in a one-to-one correspondence. It should be noted that the inner rotation bearing 310 is installed between the stator support 110 and the rotor support 210, and cooperates with the rotor support 210 to facilitate the inner rotation of the rotor. The axis of the inner rotation bearing 310, the axis of the stator support 110, and the axis of the rotor support 210 coincide, ensuring that the rotor can maintain a high degree of concentricity and stability during rotation. The driven wheel 333 in the driving gear 330 meshes with the internal tooth structure 320 to form a gear transmission system. The driving wheel 332 is sleeved on the rotor support 210 and rotates with the rotation of the rotor. The driven wheel 333 is sleeved on the fixed column on the fixed frame 331 through the bearing to achieve free rotation. The number of fixed columns on the fixed frame 331 matches the number of driven wheels 333 to ensure that each driven wheel 333 can be stably supported.

[0036] The driving wheel 332 in the driving gear 330 is connected to the rotor bracket 210, and the rotational motion of the rotor is transmitted to the driving wheel 332, and then the driving wheel 332 and the driven wheel 333 are matched and connected, and the driven wheel 333 is meshed with the inner tooth structure 320 to achieve the reduction of the rotation speed and the increase of the torque. When the driving wheel 332 rotates, it drives the driven wheel 333 meshed with it to rotate. During the rotation process, the driven wheel 333 meshes with the inner tooth structure 320 again, further transmitting the torque and changing the rotation 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 to meet the needs 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 bearing capacity, making the motor more stable and reliable during operation. Through the combination of gears with different numbers of teeth, the driving gear 330 can achieve a reduction in rotation speed and an increase in torque. This function enables the motor to adapt to the needs of different working conditions, such as selecting a small-tooth gear combination when high speed is required, and selecting a large-tooth gear combination when high torque is required.

[0037] The present invention also provides a frameless torque motor, comprising the motor heat dissipation structure as described above.

[0038] The heat dissipation duct system of the present invention forms active airflow through centrifugal force, and the heat dissipation efficiency is improved by more than 3 times compared with traditional passive heat dissipation. The temperature of the rotor magnetic sheet can be controlled within 80°C, which effectively improves the heat dissipation efficiency. In addition, the external heat dissipation device is eliminated, and the axial length of the motor is reduced by 15%-20%, which is suitable for robot joints with limited space. The composite heat-conducting structure of the aluminum heat dissipating fins and the circular ring increases the heat extraction speed of the stator winding by 40%, avoiding the thermal resistance bottleneck of the glue-filling material; the integrated design of the air duct and the heat-conducting 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, the present invention throws air out from the radial air duct of the rotor bracket under the action of centrifugal force; after the air is thrown out, negative pressure is formed at the annular air duct of the rotor bracket; the negative pressure sucks the air into the axial air duct of the glue-filling. A complete air flow path is formed. The heat dissipation ring and the heat dissipation fins are pre-placed in the gap of the winding assembly during glue filling, and the heat dissipation ring is exposed to the outer wall of the motor after the glue filling is formed, and the heat dissipation fins are further expanded from the axial depth of the bottom of the glue filling.

[0039] The above-mentioned embodiments only express several embodiments of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A motor heat dissipation structure, characterized in that: include: A stator assembly and a rotor assembly axially arranged with the stator assembly; The rotor assembly comprises a rotor support and a plurality of magnetic blocks, the rotor support is provided with an annular groove, each of the magnetic blocks is respectively embedded in the annular groove, the rotor support is provided with an annular air duct, radial air ducts are provided between adjacent magnetic blocks, each of the radial air ducts is respectively connected with the annular air duct, and the rotor support is provided with a ventilation gap, the ventilation gap is connected with the radial air duct; The stator assembly includes a stator bracket and a glue-filled insulating structure, wherein the glue-filled insulating structure is arranged on the stator bracket, and a plurality of axial air ducts are opened on the glue-filled insulating structure, and each of the axial air ducts is communicated with the annular air duct respectively.

2. The motor heat dissipation structure according to claim 1, characterized in that: A plurality of ventilation gaps are provided, each of which is located between two of the magnetic blocks, and each of the ventilation gaps is communicated with the radial channel in a one-to-one correspondence.

3. The motor heat dissipation structure according to claim 1, characterized in that: The rotor support is provided with an inner ring structure, and each of the magnetic blocks and the inner ring structure of the rotor support together form an annular air duct.

4. The motor heat dissipation structure according to claim 1, characterized in that: The rotor support is provided with an inner ring structure, and the inner ring structure is provided with an annular air duct, and the annular air duct is connected with each of the radial air ducts and each of the axial air ducts.

5. The motor heat dissipation structure according to claim 4, characterized in that: The inner ring structure is provided with an air duct gap, and the annular air duct is connected with the radial air duct through the air duct gap.

6. The motor heat dissipation structure according to claim 1, characterized in that: The stator assembly further includes a plurality of stator windings, each of which is mounted on the stator bracket and is wrapped in the glue-filled insulation structure.

7. The motor heat dissipation structure according to claim 6, characterized in that: The stator assembly also includes an annular radiator, which is embedded in the glue-filled insulation structure.

8. The motor heat dissipation structure according to claim 7, characterized in that: The annular heat sink comprises 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 stator windings.

9. 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 molded portion and an exposed portion, the injection molded portion of the heat dissipation fin is wrapped in the glue-potted insulating structure, and the exposed portion of the heat dissipation fin is exposed on the glue-potted insulating structure.

10. A frameless torque motor, characterized in that: It comprises a motor heat dissipation structure as described in any one of claims 1 to 9.

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