Plastic-sealed motor for washing machine

Abstract

The application provides a plastic-sealed motor for a washing machine, and relates to the technical field of motors.The plastic-sealed motor comprises a plastic-sealed shell, a stator assembly, a rotor assembly, a bearing assembly and an end cover, the stator assembly is plastic-sealed in the plastic-sealed shell, the rotor assembly is rotatably arranged in the plastic-sealed shell through the bearing assembly, and the rotor assembly is located in the stator assembly, and the end cover is used for closing the end of the plastic-sealed shell; the plastic-sealed motor further comprises a heat-conducting framework, the heat-conducting framework is wrapped around the periphery of the stator assembly and embedded in the plastic-sealed shell, the heat-conducting framework is used for establishing a heat-conducting path between the stator assembly and the plastic-sealed shell and establishing a supporting framework in the plastic-sealed shell, and the plastic-sealed motor has the advantage of improving the heat dissipation effect of the plastic-sealed motor.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and more specifically, to a plastic-encapsulated motor for a washing machine. Background Technology

[0002] Plastic-encapsulated motors use plastic encapsulation technology to completely encapsulate the stator core and windings of the motor with engineering plastics, eliminating the need for traditional stator insulation processes and the metal casing of ordinary motors. These micro-motors are used in household appliances such as vacuum cleaners, range hoods, air conditioners, and washing machines, as well as instrument fans. Plastic-encapsulated motors use BMC material to completely encapsulate the stator assembly, offering advantages in moisture resistance, water resistance, and corrosion resistance compared to traditional steel-cased or semi-plastic-encapsulated motors. However, they face a natural bottleneck in heat dissipation.

[0003] The conventional BMC material used in existing encapsulated motors (thermal conductivity 0.3-0.4 W / m·K) has poor thermal conductivity, meaning that the heat generated inside the motor cannot be quickly conducted to the outer casing for dissipation, causing the internal temperature to rise continuously. Currently, the thermal conductivity of commercially available BMC materials for encapsulated motors is generally around 1.0 W / (m·K), but by modifying them with fillers such as boron nitride (BN) and alumina, the thermal conductivity can be increased to 2.0-2.5 W / (m·K), reducing the module's operating temperature by 6-8℃.

[0004] However, because the washing machine motor runs continuously for a long time, a complete washing program can last for more than 2 hours, and the motor is under high load for a long time; in addition, the motor is usually installed in the bottom or rear of the washing machine in a closed space with poor air circulation and limited natural convection heat dissipation; at the same time, heat accumulates continuously when multiple operating conditions are alternated, and there is a lack of sufficient intermittent cooling time; the washing stage frequently reverses forward and backward, resulting in uneven temperature distribution; and the high-speed rotation during the spin-drying stage causes significant heat generation due to wind resistance. Summary of the Invention

[0005] The purpose of this invention is to provide a plastic-encapsulated motor for washing machines, which can improve the heat dissipation effect of the plastic-encapsulated motor.

[0006] This invention is achieved through the following technical solution: A plastic-encapsulated motor for a washing machine includes a plastic-encapsulated housing, a stator assembly, a rotor assembly, a bearing assembly, and an end cap. The stator assembly is plastic-encapsulated within the plastic-encapsulated housing. The rotor assembly is rotatably disposed within the plastic-encapsulated housing via the bearing assembly, and the rotor assembly is located within the stator assembly. The end cap is used to close the end of the plastic-encapsulated housing. It also includes a thermally conductive skeleton, which covers the periphery of the stator assembly and is embedded in the plastic encapsulation housing. The thermally conductive skeleton is used to establish a thermal conduction path between the stator assembly and the plastic encapsulation housing and to establish a support skeleton within the plastic encapsulation housing.

[0007] Furthermore, the thermally conductive frame includes multiple layers of thermally conductive rings and support rods. The multiple layers of thermally conductive rings are coaxially arranged, with the inner ring sleeved on the stator assembly. The outer thermally conductive rings are close to the outer shell of the plastic-encapsulated housing. The support rods are located between adjacent thermally conductive rings to support and fix the thermally conductive rings. Both the thermally conductive rings and the support rods are made of metal. A connector is provided between the inner thermally conductive ring and the stator assembly. The connector is used to fix the inner thermally conductive ring to the stator assembly.

[0008] Furthermore, the connector includes a connecting block disposed on the inner side of the inner heat-conducting ring and a connecting groove formed on the outer ring of the stator assembly for the connecting block to be inserted. Both the connecting block and the connecting groove are dovetail-shaped or T-shaped, and the connecting groove passes through the stator assembly along the axial direction of the encapsulated motor.

[0009] Furthermore, the support rod is provided with a plurality of anchor holes spaced apart, and the axial directions of adjacent anchor holes are staggered.

[0010] Furthermore, a fishbone heat-conducting claw is provided on the inner heat-conducting ring. The fishbone heat-conducting claw includes a middle skeleton and extension ends provided on both sides of the middle skeleton. The middle skeleton is fixedly provided on the inner heat-conducting ring, and the ends of the extension ends extend to the tooth tip and slot area of ​​the stator assembly.

[0011] Furthermore, the heat-conducting frame also includes a heat-conducting plate and a shape memory alloy. The heat-conducting plate is fixedly connected to the side wall of the inner heat-conducting ring. One end of the shape memory alloy is fixedly connected to the heat-conducting plate, and the other end of the shape memory alloy extends to the end cap mounting port of the plastic-encapsulated housing and is flush with the inner wall of the end cap mounting port. The heat of the stator assembly is transferred to the shape memory alloy through the heat-conducting ring and the heat-conducting plate. The shape memory alloy heats up and deforms towards the end cap to abut against the side wall of the end cap. The rotation of the rotor assembly drives the airflow inside and outside the plastic-encapsulated housing to cool the end cap.

[0012] Furthermore, the heat-conducting ring is hollow, and a heat-conducting liquid is disposed inside the heat-conducting ring. The heat-conducting liquid is a low-boiling-point liquid.

[0013] Furthermore, the support rod is hollow and is used to connect adjacent heat-conducting rings. The support rod has two layers: the lower support rod port is located below the heat-conducting liquid, and the upper support rod port is located above the heat-conducting liquid. After absorbing heat and vaporizing, the heat-conducting liquid enters the outer heat-conducting ring through the upper support rod, condenses into liquid in the heat-conducting ring, flows into the lower heat-conducting liquid, and then returns to the inner heat-conducting ring through the lower support rod.

[0014] Furthermore, the support rods located between and above the adjacent heat-conducting rings are inclined, with the height of the support rods near the stator assembly port being greater than the height away from the stator assembly port.

[0015] Furthermore, the support rod is in the shape of a boss, and the area of ​​the support rod near the stator assembly port is larger than the area away from the stator assembly port.

[0016] The technical solution of the present invention has at least the following advantages and beneficial effects: 1. By embedding a heat-conducting skeleton within the encapsulated housing, the heat generated by the stator assembly (core and windings) during operation is first transferred to the inner heat-conducting ring via connectors. During this process, the inner heat-conducting ring is fixedly connected to the stator assembly via connectors (dovetail or T-shaped connecting blocks and connecting grooves), forming tight mechanical and thermal contact. This significantly reduces contact thermal resistance and improves heat transfer efficiency. The heat is then transferred layer by layer via support rods to the outer heat-conducting ring, finally reaching the outer heat-conducting ring closest to the outer shell of the encapsulated housing. The heat is then dissipated to the external environment through the encapsulated housing, thereby improving the heat dissipation effect of the stator assembly and, consequently, the heat dissipation effect of the encapsulated motor. On the other hand, the heat-conducting skeleton also serves as a supporting skeleton within the encapsulated housing, bearing the encapsulation pressure during injection molding to prevent stator assembly displacement and resisting vibration and thermal stress during motor operation, thus improving the overall structural stability of the motor.

[0017] 2. When the stator assembly is working, the tooth tip and slot area are the areas with the densest windings and the most concentrated heat generation. They are also the hot spots that are most difficult to dissipate heat in traditional plastic-encapsulated structures. Through the design of the fishbone heat-conducting claws, precise heat conduction to these local heat-generating points is achieved.

[0018] 3. After the motor heats up during operation, the heat from the stator assembly is transferred to the shape memory alloy via the heat-conducting ring and heat-conducting plate. The shape memory alloy has a shape memory effect. When the temperature rises above the phase transition point, it deforms towards the end cover and actively abuts against the side wall of the end cover. When the rotor assembly rotates, it drives the airflow inside and outside the plastic-encapsulated housing, cooling the end cover and accelerating the heat transfer efficiency. As the temperature of the shape memory alloy decreases, the deformation decreases, achieving dynamic adaptive contact. In addition, the initial end of the shape memory alloy is flush with the inner wall of the end cover mounting location, reducing the obstruction of the shape memory alloy to the end cover, thus facilitating the installation of the end cover inside the plastic-encapsulated housing. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a plastic-encapsulated motor for a washing machine according to the present invention; Figure 2 This is a cross-sectional view of a plastic-encapsulated motor for a washing machine according to the present invention; Figure 3 This is an exploded view of a plastic-encapsulated motor for a washing machine according to the present invention; Figure 4 This is a schematic diagram of the structure of the heat-conducting frame in a plastic-encapsulated motor for a washing machine according to the present invention; Figure 5This is a cross-sectional view of a heat-conducting ring in a plastic-encapsulated motor for a washing machine according to the present invention; Figure 6 This is a planar schematic diagram of the heat-conducting plate and shape memory alloy in a plastic-encapsulated motor for a washing machine according to the present invention.

[0020] Figure label: 1. Plastic-encapsulated housing; 2. Stator assembly; 3. Rotor assembly; 4. Bearing assembly; 5. End cap; 6. Thermal conductive frame; 61. Thermal conductive ring; 62. Support rod; 63. Connecting block; 64. Connecting groove; 65. Thermal conductive plate; 66. Shape memory alloy; 7. Fishbone heat-conducting claw; 71. Intermediate skeleton; 72. Extension end. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0023] The following is for reference Figures 1-6 As shown in the illustration, and further explained with reference to specific embodiments, this embodiment provides a plastic-encapsulated motor for a washing machine. Figure 1-3 It includes a plastic-encapsulated housing 1, a stator assembly 2, a rotor assembly 3, a bearing assembly 4, and an end cap 5. The stator assembly 2 is encapsulated in the plastic-encapsulated housing 1. The rotor assembly 3 is rotatably disposed in the plastic-encapsulated housing 1 through the bearing assembly 4, and the rotor assembly 3 is located in the stator assembly 2. The end cap 5 is used to close the end of the plastic-encapsulated housing 1. Reference Figure 4 It also includes a heat-conducting skeleton 6, which covers the periphery of the stator assembly 2 and is embedded in the plastic encapsulation housing 1. The heat-conducting skeleton 6 is used to establish a heat conduction path between the stator assembly 2 and the plastic encapsulation housing 1 and to establish a support skeleton within the plastic encapsulation housing 1.

[0024] By embedding a heat-conducting skeleton 6 inside the encapsulated housing 1, the heat generated by the stator assembly 2 (core and winding) during operation is first transferred to the inner heat-conducting ring 61 through the connector. During this process, the inner heat-conducting ring 61 is fixedly connected to the stator assembly 2 through the connector (dovetail or T-shaped connecting block 63 and connecting groove 64), forming a tight mechanical and thermal contact, which greatly reduces the contact thermal resistance and improves the heat transfer efficiency. Then, the heat is transferred layer by layer to the outer heat-conducting ring 61 through the support rod 62, and finally reaches the outer heat-conducting ring 61 close to the outer shell of the encapsulated housing 1. The heat is dissipated to the external environment through the encapsulated housing 1, thereby improving the heat dissipation effect of the stator assembly 2, and thus improving the heat dissipation effect of the encapsulated motor.

[0025] Reference Figure 4 In this embodiment, the thermally conductive frame 6 includes multiple thermally conductive rings 61 and support rods 62. The thermally conductive rings 61 are consistent with the outer contour of the stator assembly 2. The multiple thermally conductive rings 61 are coaxially arranged, and the inner ring 61 is sleeved on the stator assembly 2. The outer thermally conductive rings 61 are close to the outer shell of the plastic-encapsulated housing 1. The support rods 62 are located between adjacent thermally conductive rings 61 and are used to support and fix the thermally conductive rings 61. Both the thermally conductive rings 61 and the support rods 62 are made of metal materials, such as aluminum, copper and other high thermal conductivity metals. A connector is provided between the inner thermally conductive ring 61 and the stator assembly 2. The connector is used to fix the inner thermally conductive ring 61 to the stator assembly 2.

[0026] Heat-conducting rings 61 of matching shape are pre-machined according to the external contour dimensions of the motor stator assembly 2, forming a multi-layer structure. All heat-conducting rings 61 are made of high thermal conductivity metals such as aluminum and copper to ensure thermal conductivity. Support rods 62 of the same material are also machined, with machining allowances. The multi-layer heat-conducting rings 61 are arranged coaxially, with the innermost ring (the innermost ring) matching the outer diameter of the stator assembly 2. This heat-conducting ring 61 is fitted onto the outside of the stator assembly 2, and its position is adjusted to ensure coaxial fit between the heat-conducting ring 61 and the stator assembly 2. Pre-machined support rods 62 are placed between adjacent heat-conducting rings 61, with both ends of the support rods 62 fixedly connected to the ring walls of two adjacent heat-conducting rings 61. The support rods 62 support and position the multi-layer heat-conducting rings 61, maintaining a stable interval between each heat-conducting ring 61, forming an overall heat-conducting skeleton structure 6. A connector is installed between the innermost heat-conducting ring 61 and the stator assembly 2. The inner heat-conducting ring 61 is firmly fixed to the outer wall of the stator assembly 2 through the connector, completing the pre-assembly of the heat-conducting frame 6 and the stator assembly 2. The pre-assembled whole is placed into a molding die for molding. After molding, the outermost heat-conducting ring 61 is attached to the inner wall of the outer shell close to the molding shell 1, completing the assembly of the entire molding motor with the heat-conducting frame 6.

[0027] Based on the structural design of the multi-layer heat-conducting ring 61, which is coaxially layered radially and sleeved on the inner side of the stator near the plastic-encapsulated shell, combined with the support rod 62 for support and fixation, a continuous radial heat conduction path is formed from the stator assembly 2 to the plastic-encapsulated shell. The heat generated by the operation of the stator assembly 2 can be directly transferred to the inner heat-conducting ring 61, and then transferred layer by layer to the outer heat-conducting ring 61 through the support rod 62. Finally, it is quickly conducted to the plastic-encapsulated shell and dissipated outward. This solves the problem that the heat inside the plastic-encapsulated motor is blocked by the plastic material and is difficult to dissipate outward, and greatly improves the overall heat dissipation efficiency of the motor.

[0028] The multi-layer heat-conducting ring 61 is supported by the support rod 62 to form an integrated skeleton structure. This structure can improve the overall structural strength of the plastic-encapsulated shell 1 during the molding process, enhance the plastic-encapsulated shell 1's resistance to deformation and impact, reduce the risk of shell cracking and stator displacement caused by external forces, and improve the overall structural reliability of the motor.

[0029] Reference Figure 3 and Figure 4 In this embodiment, the connector includes a connecting block 63 disposed inside the inner heat-conducting ring 61 and a connecting groove 64 formed on the outer ring of the stator assembly 2 for the connecting block 63 to be inserted. Both the connecting block 63 and the connecting groove 64 are dovetail-shaped or T-shaped. The connecting groove 64 passes through the stator assembly 2 along the axial direction of the encapsulated motor. When the heat-conducting frame 6 is assembled with the stator assembly 2, the initial positioning can be completed simply by inserting the connecting block 63 into the connecting groove 64 along the axial direction. No additional bonding or locking process is required, which simplifies the assembly process. At the same time, the dovetail-shaped or T-shaped mating structure can achieve radial positioning and locking of the heat-conducting ring 61 and the stator assembly 2, avoiding relative displacement between the two in the radial direction, further improving the mating stability of the stator and the heat-conducting frame 6, and ensuring the continuous and smooth heat conduction path.

[0030] Reference Figure 3 and Figure 4 In this embodiment, the support rod 62 is provided with multiple anchor holes spaced apart, and the axial directions of adjacent anchor holes are staggered. During the molding process, the molding material flows into the anchor holes. After the molding material cures, an anchoring structure that fits and locks with the support rod 62 is formed at the anchor holes. The staggered anchor hole axes can enhance the bonding force between the support rod 62 and the molding shell 1 from multiple different directions, preventing relative displacement or delamination between the support rod 62 and the molding shell 1, and further strengthening the bonding stability of the integrated structure.

[0031] Reference Figure 4 In this embodiment of the application, a fishbone heat-conducting claw 7 is provided on the inner heat-conducting ring 61. The fishbone heat-conducting claw 7 includes a middle skeleton 71 and extension ends 72 provided on both sides of the middle skeleton 71. The middle skeleton 71 is fixedly provided on the inner heat-conducting ring 61, and the ends of the extension ends 72 extend to the tooth tip and slot area of ​​the stator assembly 2.

[0032] When the stator assembly 2 is working, the tooth tip and slot area are the areas with the densest winding and the most concentrated heat generation. The heat generated by the stator assembly 2 can be quickly transferred to the extension end 72 through the tooth tip and slot area, and then converged and conducted to the inner heat conduction ring 61 through the intermediate frame 71. Finally, it is dissipated outward through the outer heat conduction ring 61. The fishbone-shaped distribution structure increases the contact area between the heat conduction claws and the stator assembly 2 and the molding compound. It can widen the heat conduction path and improve the heat conduction efficiency without increasing the volume of the components, and further enhance the overall heat dissipation effect of the molding motor.

[0033] Reference Figure 4 and Figure 6 In this embodiment, the heat-conducting frame 6 further includes a heat-conducting plate 65 and a shape memory alloy 66. The heat-conducting plate 65 is fixedly connected to the side wall of the inner heat-conducting ring 61. One end of the shape memory alloy 66 is fixedly connected to the heat-conducting plate 65, and the other end of the shape memory alloy 66 extends to the mounting port of the end cap 5 of the plastic-encapsulated housing 1 and is flush with the inner wall of the mounting port of the end cap 5. The heat of the stator assembly 2 is transferred to the shape memory alloy 66 through the heat-conducting ring 61 and the heat-conducting plate 65. The shape memory alloy 66 heats up and deforms towards the end cap 5 to abut against the side wall of the end cap 5. The rotor assembly 3 rotates, causing the air inside and outside the plastic-encapsulated housing 1 to flow and cool the end cap 5.

[0034] Compared to the conventional structure where the heat conduction path only extends to the inner wall of the plastic-encapsulated housing 1, the temperature-response deformation characteristics of the shape memory alloy 66 can maintain the original structure when the motor is running at low power and generating less heat, avoiding excessive occupation of the assembly space of the end cover 5. At the same time, when the motor is running under high load and the stator temperature rises, the heat conduction path from the stator to the end cover 5 can be automatically connected, directly transferring heat to the end cover 5, which has a larger contact area with the outside air. The heat exchange between the end cover 5 and the flowing air can improve the heat dissipation efficiency, allowing the heat dissipation capacity to be dynamically adjusted to match the actual heat generation state of the motor, further optimizing the heat dissipation effect.

[0035] Reference Figure 4 and Figure 5 In this embodiment of the application, when the encapsulated motor is installed in the washing machine, the rotor assembly 3 is arranged vertically, the heat conduction ring 61 is hollow, and the heat conduction ring 61 is filled with heat conduction liquid, which is a low boiling point liquid, such as acetone, ethanol, etc.

[0036] When the motor stator assembly 2 generates heat, the heat is conducted through the inner wall of the heat-conducting ring 61 to the internal heat-conducting liquid. The heat-conducting liquid absorbs heat and evaporates into a gaseous state. The low-density gaseous heat-conducting liquid flows upward to the upper end of the heat-conducting ring 61, and under the action of gravity, flows back along the inner wall of the heat-conducting ring 61 to the bottom to absorb heat again. Through the gas-liquid phase change cycle, the heat generated by the stator is continuously transferred to the end cover 5 and dissipated outward. The phase change heat transfer of the heat-conducting liquid can significantly improve the heat conduction efficiency along the heat conduction path, further accelerate the speed of heat conduction outward, enhance the overall heat dissipation capacity of the encapsulated motor, and adapt to the high heat generation scenario when the washing machine is running under high load.

[0037] Reference Figure 4 and Figure 5 In this embodiment, the support rod 62 is hollow, and the anchor hole is located on one side of the inner hole of the support rod 62. The support rod 62 is used to connect the adjacent heat-conducting ring 61. The support rod 62 is provided with two layers. The port of the lower support rod 62 is located below the heat-conducting liquid, and the port of the upper support rod 62 is located above the heat-conducting liquid. After the heat-conducting liquid absorbs heat and vaporizes, it enters the outer heat-conducting ring 61 through the upper support rod 62, condenses into liquid in the heat-conducting ring 61 and flows into the lower heat-conducting liquid, and then returns to the inner heat-conducting ring 61 through the lower support rod 62.

[0038] The multi-ring, layered phase change circulation structure further expands the heat exchange area of ​​phase change heat transfer, allowing the vaporized heat transfer fluid to condense more quickly in the outer heat transfer ring 61. After condensation, the volume of the heat transfer fluid in the outer heat transfer ring 61 increases, causing an imbalance in the liquid levels of the heat transfer fluid in the inner and outer heat transfer rings 61. The heat transfer fluid in the outer heat transfer ring 61 returns to the inner heat transfer ring 61 through the lower support rod 62, preventing the gaseous heat transfer fluid from accumulating at the top and affecting circulation efficiency. This ensures the entire heat transfer process operates stably and maintains a consistently high heat transfer efficiency. Simultaneously, the liquid-to-liquid convection between different heat transfer rings 61 further evens out the temperature distribution, preventing localized heat accumulation and allowing the stator's heat to be transferred more evenly and quickly to the end cover 5. This ensures the temperature stability of the motor under prolonged high-load operation and extends the motor's service life.

[0039] Reference Figure 4 and Figure 5In this embodiment, the support rod 62 located above and between adjacent heat-conducting rings 61 is inclined, with the height of the support rod 62 near the stator assembly 2 port being greater than its height away from the stator assembly 2 port. The vaporized gaseous heat-conducting liquid can naturally flow towards the outer heat-conducting ring 61 away from the stator assembly 2 along the inclined direction of the support rod 62, preventing the gaseous heat-conducting liquid from stagnating within the support rod 62. This further accelerates the transport efficiency of the gaseous heat-conducting liquid, increases the overall flow rate of the phase change cycle, and enhances the heat exchange effect. Simultaneously, the inclined structure also prevents the condensed liquid heat-conducting liquid from remaining in the upper support rod 62, ensuring that all condensed liquid flows into the outer heat-conducting ring 61 by gravity and then returns through the lower support rod 62. This makes the entire phase change cycle loop smoother, preventing liquid stagnation from affecting the circulation power and further improving the operational stability of the entire heat-conducting structure.

[0040] Reference Figure 4 and Figure 5 In this embodiment, the support rod 62 is in the shape of a boss, and the area of ​​the support rod 62 near the stator assembly 2 port is larger than the area away from the stator assembly 2 port. The boss-shaped support rod 62 increases the port area of ​​the support rod 62, and the heat-conducting liquid that is easily vaporized in the inner heat-conducting ring 61 enters the outer heat-conducting ring 61 through the support rod 62. On the one hand, this enhances the ability of the support rod 62 to bear the heat of the stator, allowing the heat generated by the stator to be transferred into the heat-conducting liquid inside the heat-conducting ring 61 more quickly. On the other hand, it can also improve the connection strength between the support rod 62 and the stator assembly 2, improve the structural stability of the entire heat-conducting structure, and reduce the risk of structural loosening caused by vibration during motor operation.

[0041] The implementation principle of a plastic-encapsulated motor for a washing machine according to an embodiment of the present invention is as follows: By embedding a heat-conducting skeleton 6 inside the encapsulated housing 1, the heat generated by the stator assembly 2 (core and winding) during operation is first transferred to the inner heat-conducting ring 61 through the connector. During this process, the inner heat-conducting ring 61 is fixedly connected to the stator assembly 2 through the connector (dovetail or T-shaped connecting block 63 and connecting groove 64), forming a tight mechanical and thermal contact, which greatly reduces the contact thermal resistance and improves the heat transfer efficiency. Then, the heat is transferred layer by layer to the outer heat-conducting ring 61 through the support rod 62, and finally reaches the outer heat-conducting ring 61 close to the outer shell of the encapsulated housing 1. The heat is dissipated to the external environment through the encapsulated housing 1, thereby improving the heat dissipation effect of the stator assembly 2 and thus improving the heat dissipation effect of the encapsulated motor.

Claims

1. A plastic-sealed motor for a washing machine, characterized in that, The device includes a plastic-encapsulated housing (1), a stator assembly (2), a rotor assembly (3), a bearing assembly (4), and an end cap (5). The stator assembly (2) is encapsulated within the plastic-encapsulated housing (1). The rotor assembly (3) is rotatably disposed within the plastic-encapsulated housing (1) via the bearing assembly (4), and the rotor assembly (3) is located within the stator assembly (2). The end cap (5) is used to close the end of the plastic-encapsulated housing (1). It also includes a heat-conducting skeleton (6), which covers the periphery of the stator assembly (2) and is embedded in the plastic encapsulation shell (1). The heat-conducting skeleton (6) is used to establish a heat conduction path between the stator assembly (2) and the plastic encapsulation shell (1) and to establish a support skeleton in the plastic encapsulation shell (1).

2. The encapsulated motor for a washing machine according to claim 1, characterized in that, The heat-conducting frame (6) includes multiple layers of heat-conducting rings (61) and support rods (62). The multiple layers of heat-conducting rings (61) are coaxially arranged, and the heat-conducting ring (61) located in the inner ring is sleeved on the stator assembly (2). The heat-conducting ring (61) located on the outer side is close to the outer shell of the plastic-encapsulated housing (1). The support rod (62) is located between adjacent heat-conducting rings (61) and is used to support and fix the heat-conducting ring (61). Both the heat-conducting ring (61) and the support rod (62) are made of metal. A connector is provided between the heat-conducting ring (61) located on the inner side and the stator assembly (2). The connector is used to fix the heat-conducting ring (61) on the inner side to the stator assembly (2).

3. A plastic-sealed motor for a washing machine according to claim 2, characterized in that, The connector includes a connecting block (63) disposed inside the inner heat-conducting ring (61) and a connecting groove (64) opened on the outer ring of the stator assembly (2) for the connecting block (63) to be inserted. Both the connecting block (63) and the connecting groove (64) are dovetail-shaped or T-shaped. The connecting groove (64) passes through the stator assembly (2) along the axial direction of the encapsulated motor.

4. A plastic-sealed motor for a washing machine according to claim 2, characterized in that, The support rod (62) is provided with a plurality of anchor holes spaced apart, and the axial directions of adjacent anchor holes are staggered.

5. A plastic-sealed motor for a washing machine according to claim 2, characterized in that, A fishbone heat-conducting claw (7) is provided on the inner heat-conducting ring (61). The fishbone heat-conducting claw (7) includes a middle skeleton (71) and extension ends (72) provided on both sides of the middle skeleton (71). The middle skeleton (71) is fixedly provided on the inner heat-conducting ring (61). The end of the extension end (72) extends to the tooth tip and slot area of ​​the stator assembly (2).

6. A plastic-encapsulated motor for a washing machine according to claim 2, characterized in that, The heat-conducting frame (6) also includes a heat-conducting plate (65) and a shape memory alloy (66). The heat-conducting plate (65) is fixedly connected to the side wall of the inner heat-conducting ring (61). One end of the shape memory alloy (66) is fixedly connected to the heat-conducting plate (65). The other end of the shape memory alloy (66) extends to the mounting port of the end cap (5) of the plastic-encapsulated housing (1) and is flush with the inner wall of the mounting port of the end cap (5). The heat of the stator assembly (2) is transferred to the shape memory alloy (66) through the heat-conducting ring (61) and the heat-conducting plate (65). The shape memory alloy (66) heats up and deforms towards the end cap (5) and abuts against the side wall of the end cap (5). The rotor assembly (3) rotates and drives the air inside and outside the plastic-encapsulated housing (1) to flow and cool the end cap (5).

7. A plastic-encapsulated motor for a washing machine according to claim 2, characterized in that, The heat-conducting ring (61) is hollow, and a heat-conducting liquid is disposed inside the heat-conducting ring (61). The heat-conducting liquid is a low-boiling-point liquid.

8. A plastic-encapsulated motor for a washing machine according to claim 7, characterized in that, The support rod (62) is hollow and is used to connect the adjacent heat-conducting ring (61). The support rod (62) has two layers. The lower support rod (62) has its port below the heat-conducting liquid, and the upper support rod (62) has its port above the heat-conducting liquid. After absorbing heat and vaporizing, the heat-conducting liquid enters the outer heat-conducting ring (61) through the upper support rod (62), condenses into liquid in the heat-conducting ring (61), and flows into the lower heat-conducting liquid. Then, it returns to the inner heat-conducting ring (61) through the lower support rod (62).

9. A plastic-sealed motor for a washing machine according to claim 8, characterized in that, The support rod (62) between and above the adjacent heat-conducting ring (61) is inclined, and the height of the support rod (62) near the stator assembly (2) port is greater than the height away from the stator assembly (2) port.

10. A plastic-sealed motor for a washing machine according to claim 8, characterized in that, The support rod (62) is in the shape of a boss, and the area of ​​the support rod (62) near the port of the stator assembly (2) is larger than the area away from the port of the stator assembly (2).

Images