Outer rotor sealed motor

Abstract

The utility model relates to motor technical field, especially a kind of outer rotor sealing motor, including base, first end cover, second end cover, shell, stator assembly and rotor assembly, the both ends of base are respectively provided with first connecting end and second connecting end, first connecting end is provided with first rotary connecting element, second connecting end is provided with second rotary connecting element, stator assembly is set on base, rotor assembly is set on the inner wall of shell and with stator assembly opposite;First rotary connecting element is used to connect base and first end cover, and be located between the both respectively provided with first sealing inner ring and first sealing outer ring.The utility model can effectively prevent dust, moisture and other external impurities into the sealed cavity in motor interior, thereby prolong the service life of stator assembly and rotor assembly in motor, reduce the failure occurrence probability caused by impurity invasion.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to an external rotor sealed motor. Background Technology

[0002] External rotor motors, as a type of power equipment widely used in many fields such as industry and home appliances, play an important role in modern production and life. However, current external rotor motors still face some problems that urgently need to be solved in practical applications. The assembly process of the end caps of existing external rotor motors is often quite inconvenient. Traditional assembly methods involve multiple complex steps, requiring workers to precisely align multiple components. Even slight deviations can affect the overall performance of the motor, resulting in low assembly efficiency and increased production cycle and cost.

[0003] Poor sealing is also a prominent problem with existing external rotor motor end covers. Inadequate sealing allows dust, moisture, and other impurities to easily enter the motor, accelerating the wear of internal components and potentially causing electrical faults, severely impacting the motor's lifespan and stability. This problem is particularly acute in demanding applications such as outdoor robotics. Therefore, a new design for the existing motor sealing structure is necessary. Utility Model Content

[0004] To solve the above problems, this utility model can effectively prevent external impurities such as dust and moisture from entering the sealed cavity inside the motor, thereby extending the service life of the stator and rotor assemblies inside the motor and reducing the probability of failure caused by impurities.

[0005] The technical solution adopted by this utility model is as follows: an external rotor sealed motor, including a base, a first end cover, a second end cover, a housing, a stator assembly, and a rotor assembly. The base has a first connecting end and a second connecting end at its two ends. The first connecting end has a first rotary connecting element, and the second connecting end has a second rotary connecting element. The stator assembly is mounted on the base, and the rotor assembly is mounted on the inner wall of the housing and opposite to the stator assembly. The first end cover and the second end cover are fixedly connected to the two ends of the housing, forming a sealed cavity with the base as the center. The stator assembly and the rotor assembly are both located within the sealed cavity. The first rotary connecting element connects the base and the first end cover, and a first sealing inner ring and a first sealing outer ring are respectively provided between them. The second rotary connecting element connects the base and the second end cover, and a second sealing inner ring and a second sealing outer ring are respectively provided between them. A first sealing element is provided between the first end cover and the housing, and a second sealing element is provided between the second end cover and the housing.

[0006] A further improvement to the above solution is that the first connecting end is provided with a first connecting step, the wall surface of the first connecting step is provided with a first sealing inner groove, the first rotary connecting element is provided on the first connecting step, and the first sealing inner ring is provided on the first sealing inner groove and is used to abut against the inner diameter of the first rotary connecting element.

[0007] A further improvement to the above solution is that the first end cap is provided with a first connecting inner ring and a first connecting outer ring, the first connecting inner ring is provided with a first inner ring step, the wall surface of the first inner ring step is provided with a first sealing outer groove, the first inner ring step is used to connect to the outer diameter of the first rotary connecting element, the first sealing outer groove is used to install the first sealing outer ring, and the first sealing outer ring is used to abut against the outer diameter of the first rotary connecting element.

[0008] A further improvement to the above solution is that the outer diameter of the first connecting outer ring is provided with a first outer ring groove, the first outer ring groove is used to accommodate the first sealing element, and the outer diameter of the first sealing element is used to abut against the inner diameter of the outer shell.

[0009] A further improvement to the above scheme is that the second connecting end is provided with a second connecting step, the wall surface of the second connecting step is provided with a second sealing inner groove, the second rotary connecting element is provided on the second connecting step, and the second sealing inner ring is provided on the second sealing inner groove and is used to abut against the inner diameter of the second rotary connecting element.

[0010] A further improvement to the above scheme is that an inner groove is provided on one side of the second connecting step, and a third sealing element is provided in the inner groove. The third sealing element is used for sealing and abutting the end face of the second rotary connecting element.

[0011] A further improvement to the above scheme is that the second end cap is provided with a second connecting inner ring and a second connecting outer ring, the second connecting inner ring is provided with a second inner ring step, the wall surface of the second inner ring step is provided with a second sealing outer groove, the second inner ring step is used to connect the outer diameter of the second rotary connecting element, the second sealing outer groove is used to install the second sealing outer ring, and the second sealing outer ring is used to abut against the outer diameter of the second rotary connecting element.

[0012] A further improvement to the above solution is that the second connecting outer ring is provided with a right-angle connecting part, the right-angle connecting part is used to fix the end of the outer shell, the inner diameter of the outer shell is provided with a sealing fixing ring, the sealing fixing ring is provided with a sealing fixing groove, and the second sealing element is provided in the sealing fixing groove and is used to abut against the second end cap.

[0013] A further improvement to the above scheme is that a stator connector is provided inside the base, a stator mounting groove is provided on the outer diameter of the stator connector, a stator assembly is provided on the stator mounting groove, and a stator arm is provided on the stator assembly, the stator arm extending toward the outer shell.

[0014] A further improvement to the above scheme is that the rotor assembly includes multiple magnets, one end of which is close to the first end cover, and the magnetic direction of the magnet is opposite to that of the stator winding arm.

[0015] The beneficial effects of this utility model are:

[0016] Compared to existing external rotor motors, this invention effectively prevents external impurities such as dust and moisture from entering the sealed cavity inside the motor by setting a first sealing inner ring, a first sealing outer ring, a second sealing inner ring, and a second sealing outer ring between the base and the first end cover and the second end cover, respectively, and by setting a first sealing element and a second sealing element between the first end cover and the outer shell, and between the second end cover and the outer shell. This extends the service life of the stator and rotor assemblies and reduces the probability of failures caused by impurities. It also helps improve the motor's operational stability. The sealed cavity creates a relatively stable operating environment for the stator and rotor assemblies, reducing interference from external environmental factors on the internal electromagnetic conversion process and ensuring more stable and reliable motor performance output. The first and second rotary connecting elements not only achieve a reliable connection between the base and the end cover but also provide good mechanical support for the entire motor, ensuring accurate relative positions of the components during operation and reducing the adverse effects of vibration or displacement on motor performance. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the external rotor sealed motor of this utility model;

[0018] Figure 2 for Figure 1 Explosion-proof diagram of a Chinese-foreign rotor sealed motor;

[0019] Figure 3 for Figure 1 An exploded view of a Chinese and foreign rotor sealed motor;

[0020] Figure 4 for Figure 1 Front view schematic diagram of a Chinese-foreign rotor sealed motor;

[0021] Figure 5 for Figure 4 Sectional view of AA;

[0022] Figure 6 for Figure 5 Enlarged diagram of point A in the diagram;

[0023] Figure 7 for Figure 5 Enlarged diagram of point B in the image.

[0024] Explanation of reference numerals in the attached drawings: Base 1, First connecting end 11, First connecting step 111, First sealing inner groove 112, Second connecting end 12, Second connecting step 121, Second sealing inner groove 122, Inner ring groove 123, Third sealing element 124, First rotary connecting element 13, First sealing inner ring 131, First sealing outer ring 132, Second rotary connecting element 14, Second sealing inner ring 141, Second sealing outer ring 142, Stator connecting seat 15, Stator mounting groove 16, First end 2. Cover, 21. First sealing element, 22. First connecting inner ring, 221. First inner ring step, 222. First sealing outer groove, 23. First connecting outer ring, 231. Second end cover, 3. Second sealing element, 31. Second connecting inner ring, 32. Second inner ring step, 321. Second sealing outer groove, 322. Second connecting outer ring, 33. Right angle connecting part, 331. Outer shell, 4. Sealing fixing ring, 41. Sealing fixing groove, 42. Stator assembly, 5. Stator winding arm, 51. Rotor assembly, 6. Magnet, 61. Detailed Implementation

[0025] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0026] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Figures 1-7As shown, in one embodiment of this utility model, an external rotor sealed motor is disclosed, comprising a base 1, a first end cover 2, a second end cover 3, a housing 4, a stator assembly 5, and a rotor assembly 6. The base 1 has a first connecting end 11 and a second connecting end 12 at its two ends. The first connecting end 11 is provided with a first rotating connecting element 13, and the second connecting end 12 is provided with a second rotating connecting element 14. The stator assembly 5 is mounted on the base 1, and the rotor assembly 6 is mounted on the inner wall of the housing 4 and opposite to the stator assembly 5. The first end cover 2 and the second end cover 3 are fixedly connected to both ends of the housing 4. A sealed cavity is formed with the base 1 as the center, and the stator assembly 5 and the rotor assembly 6 are both located in the sealed cavity; the first rotary connecting element 13 is used to connect the base 1 and the first end cover 2, and a first sealing inner ring 131 and a first sealing outer ring 132 are respectively provided between the two; the second rotary connecting element 14 is used to connect the base 1 and the second end cover 3, and a second sealing inner ring 141 and a second sealing outer ring 142 are respectively provided between the two; a first sealing element 21 is provided between the first end cover 2 and the outer shell 4, and a second sealing element 31 is provided between the second end cover 3 and the outer shell 4. This embodiment effectively prevents external impurities such as dust and moisture from entering the sealed cavity inside the motor by setting a first sealing inner ring 131, a first sealing outer ring 132, a second sealing inner ring 141, and a second sealing outer ring 142 between the base 1 and the first end cover 2 and the second end cover 3, respectively, and by setting a first sealing element 21 and a second sealing element 31 between the first end cover 2 and the outer shell 4 and the second end cover 3 and the outer shell 4. This extends the service life of the stator assembly 5 and the rotor assembly 6 inside the motor and reduces the probability of failure caused by impurities. It also helps to improve the operating stability of the motor. The sealed cavity can create a relatively stable operating environment for the stator assembly 5 and the rotor assembly 6, reduce the interference of external environmental factors on the electromagnetic conversion process inside the motor, and ensure that the performance output of the motor is more stable and reliable. The first rotary connecting element 13 and the second rotary connecting element 14 not only realize the reliable connection between the base 1 and the end cover, but also provide good mechanical support for the motor as a whole, ensuring the accurate relative position of each component during the operation of the motor and reducing the adverse effects of vibration or displacement on the motor performance.

[0028] The first connecting end 11 is provided with a first connecting step 111, and the wall surface of the first connecting step 111 is provided with a first sealing inner groove 112. The first rotary connecting element 13 is disposed on the first connecting step 111, and the first sealing inner ring 131 is disposed on the first sealing inner groove 112 and is used to abut against the inner diameter of the first rotary connecting element 13. In this embodiment, the first connecting step 111 provides a precise and stable installation and positioning foundation for the first rotary connecting element 13, ensuring that it can be accurately installed in the designated position, ensuring the relative positional accuracy between the various components of the motor, and reducing operational instability factors caused by installation deviations. The design of the first sealing inner groove 112 provides a reliable accommodating space for the first sealing inner ring 131. The first sealing inner ring 131 is disposed on the first sealing inner groove 112 and abuts against the inner diameter of the first rotary connecting element 13, achieving a good sealing function. It prevents the leakage of lubricating oil inside the motor, avoiding problems such as accelerated wear and performance degradation of motor components caused by lubricating oil leakage. At the same time, it can prevent external dust, moisture and other impurities from entering the motor, keeping the internal environment of the motor clean and reducing the risk of electrical faults caused by impurities.

[0029] The first end cap 2 is provided with a first connecting inner ring 22 and a first connecting outer ring 23. The first connecting inner ring 22 is provided with a first inner ring step 221, and the wall surface of the first inner ring step 221 is provided with a first sealing outer groove 222. The first inner ring step 221 is used to connect to the outer diameter of the first rotating connecting element 13, and the first sealing outer groove 222 is used to install the first sealing outer ring 132, which abuts against the outer diameter of the first rotating connecting element 13. Specifically, the outer diameter of the first connecting outer ring 23 is provided with a first outer ring groove 231, which is used to accommodate the first sealing element 21, and the outer diameter of the first sealing element 21 abuts against the inner diameter of the outer casing 4. In this embodiment, the first inner ring step 221 on the first connecting inner ring 22 is adapted to the outer diameter of the first rotating connecting element 13, ensuring the stability of the internal structure of the motor and effectively reducing radial wobble between rotating parts, thus reducing vibration and noise generated during operation. The first sealing outer groove 222 and the first sealing outer ring 132 installed on the wall of the first inner ring step 221 abut against the outer diameter of the first rotary connecting element 13, forming a reliable dynamic sealing structure. This structure prevents leakage of lubricating oil inside the motor and resists the intrusion of external dust, moisture, and other impurities, extending the service life of the motor and improving its operational reliability. The first outer ring groove 231 of the outer diameter of the first connecting outer ring 23 accommodates the first sealing element 21, and the outer diameter of the sealing element abuts against the inner diameter of the outer casing 4, enhancing the overall sealing performance of the motor. A solid static sealing barrier is constructed between the motor end cover and the outer casing 4, effectively preventing gas exchange between the motor interior and the external environment and reducing the impact of environmental factors on motor performance.

[0030] The second connecting end 12 is provided with a second connecting step 121, and the wall surface of the second connecting step 121 is provided with a second sealing inner groove 122. The second rotary connecting element 14 is disposed on the second connecting step 121, and the second sealing inner ring 141 is disposed on the second sealing inner groove 122 and is used to abut against the inner diameter of the second rotary connecting element 14. In this embodiment, the second connecting step 121 provides a precise and stable installation positioning foundation for the second rotary connecting element 14, ensuring its installation accuracy and firmness, thereby ensuring the stability of the overall structure of the motor. The cooperation between the second sealing inner groove 122 and the second sealing inner ring 141 improves the sealing performance of the motor. The second sealing inner ring 141 is disposed on the second sealing inner groove 122 and abuts against the inner diameter of the second rotary connecting element 14, which can effectively prevent external moisture, dust and other impurities from entering the motor, avoiding these impurities from causing corrosion and damage to key components such as the motor windings and rotor, thereby extending the service life of the motor. At the same time, good sealing performance helps to maintain a stable working environment inside the motor, reduce electrical performance fluctuations caused by external factors, and improve the reliability and stability of motor operation.

[0031] An inner groove 123 is provided on one side of the second connecting step 121, and a third sealing element 124 is provided within the inner groove 123. The third sealing element 124 is used for sealing and abutting the end face of the second rotary connecting element 14. In this embodiment, the sealing and abutting of the third sealing element 124 with the end face of the second rotary connecting element 14 can effectively prevent leakage of lubricating oil, coolant, and other media inside the motor. This not only ensures the stability of the internal working environment of the motor, preventing corrosion or damage to motor components due to media leakage and extending the service life of the motor; but also avoids media leakage to the outside of the motor, reducing pollution to surrounding equipment and the working environment. It helps to improve the overall protection performance of the motor. It can resist the intrusion of external dust, moisture, and other impurities, preventing them from entering the motor and affecting electrical performance and mechanical operation.

[0032] The second end cap 3 is provided with a second connecting inner ring 32 and a second connecting outer ring 33. The second connecting inner ring 32 is provided with a second inner ring step 321, and the wall surface of the second inner ring step 321 is provided with a second sealing outer groove 322. The second inner ring step 321 is used to connect to the outer diameter of the second rotating connecting element 14, and the second sealing outer groove 322 is used to install the second sealing outer ring 142, which abuts against the outer diameter of the second rotating connecting element 14. Specifically, the second connecting outer ring 33 is provided with a right-angle connecting part 331, which is used to fix the end of the outer shell 4. The inner diameter of the outer shell 4 is provided with a sealing fixing ring 41, which is provided with a sealing fixing groove 42. The second sealing element 31 is disposed in the sealing fixing groove 42 and abuts against the second end cap 3. In this embodiment, the second connecting inner ring 32 and the second inner ring step 321 thereon provide a precise and stable connection and positioning for the second rotating connecting element 14, ensuring the coaxiality between rotating components and effectively reducing vibration and noise during operation. The cooperation between the second sealing outer groove 322 and the second sealing outer ring 142 reliably blocks external dust, moisture, and other impurities, preventing them from entering the motor and greatly improving the motor's protection level and extending its service life. The right-angle connection 331 of the second connecting outer ring 33 securely fixes itself to the end of the outer casing 4, enhancing the overall stability of the motor structure. The sealing fixing ring 41 and the second sealing element 31 within the sealing fixing groove 42 not only further strengthen the motor's sealing performance but also abut against the second end cover 3, helping to buffer the axial impact force generated during operation, making the motor run more smoothly and reliably.

[0033] A stator connector 15 is provided within the base 1. The outer diameter of the stator connector 15 has a stator mounting groove 16. The stator assembly 5 is mounted on the stator mounting groove 16 and includes a stator winding arm 51 extending towards the outer casing 4. Specifically, the rotor assembly 6 includes multiple magnets 61, one end of which is close to the first end cover 2. The magnetic direction of the magnets 61 is opposite to that of the stator winding arm 51. In this embodiment, the stator connector 15 and the stator mounting groove 16 within the base 1 ensure the correct position of the stator assembly 5 in the motor, reducing uneven magnetic field distribution caused by installation deviations, thereby improving motor operating efficiency and stability. The stator winding arm 51 extending towards the outer casing 4 optimizes the magnetic field coupling path, enhances the magnetic interaction with the rotor assembly 6, resulting in smoother motor output torque and more efficient power transmission. The arrangement of multiple magnets 61 in the rotor assembly 6, with one end close to the first end cover 2 and the magnetic direction opposite to the stator winding arm 51, precisely constructs the magnetic field environment inside the motor. This effectively reduces magnetic leakage, improves magnetic energy utilization, allows the motor to generate greater output power under the same input power, and enhances the overall performance of the motor.

[0034] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An external rotor sealed motor, characterized in that: The device includes a base, a first end cap, a second end cap, a housing, a stator assembly, and a rotor assembly. The base has a first connecting end and a second connecting end at its two ends. The first connecting end has a first rotary connecting element, and the second connecting end has a second rotary connecting element. The stator assembly is mounted on the base, and the rotor assembly is mounted on the inner wall of the housing and opposite to the stator assembly. The first and second end caps are fixedly connected to the two ends of the housing, forming a sealed cavity centered on the base. Both the stator assembly and the rotor assembly are located within this sealed cavity. The first rotary connecting element connects the base and the first end cap, and a first inner sealing ring and a first outer sealing ring are respectively disposed between them. The second rotary connecting element connects the base and the second end cap, and a second inner sealing ring and a second outer sealing ring are respectively disposed between them. A first sealing element is disposed between the first end cap and the housing, and a second sealing element is disposed between the second end cap and the housing.

2. The external rotor sealed motor according to claim 1, characterized in that: The first connecting end is provided with a first connecting step, the wall surface of the first connecting step is provided with a first sealing inner groove, the first rotating connecting element is provided on the first connecting step, and the first sealing inner ring is provided on the first sealing inner groove and is used to abut against the inner diameter of the first rotating connecting element.

3. The external rotor sealed motor according to claim 2, characterized in that: The first end cap is provided with a first connecting inner ring and a first connecting outer ring. The first connecting inner ring is provided with a first inner ring step. The wall surface of the first inner ring step is provided with a first sealing outer groove. The first inner ring step is used to connect to the outer diameter of the first rotary connecting element. The first sealing outer groove is used to install the first sealing outer ring. The first sealing outer ring is used to abut against the outer diameter of the first rotary connecting element.

4. The external rotor sealed motor according to claim 3, characterized in that: The outer diameter of the first connecting outer ring is provided with a first outer ring groove, which is used to accommodate the first sealing element. The outer diameter of the first sealing element is used to abut against the inner diameter of the outer shell.

5. The external rotor sealed motor according to claim 1, characterized in that: The second connecting end is provided with a second connecting step, the wall surface of the second connecting step is provided with a second sealing inner groove, the second rotating connecting element is provided on the second connecting step, and the second sealing inner ring is provided on the second sealing inner groove and is used to abut against the inner diameter of the second rotating connecting element.

6. The external rotor sealed motor according to claim 5, characterized in that: An inner groove is provided on one side of the second connecting step, and a third sealing element is provided in the inner groove. The third sealing element is used for sealing and abutting the end face of the second rotary connecting element.

7. The external rotor sealed motor according to claim 5, characterized in that: The second end cap is provided with a second connecting inner ring and a second connecting outer ring. The second connecting inner ring is provided with a second inner ring step. The wall surface of the second inner ring step is provided with a second sealing outer groove. The second inner ring step is used to connect the outer diameter of the second rotary connecting element. The second sealing outer groove is used to install the second sealing outer ring. The second sealing outer ring is used to abut against the outer diameter of the second rotary connecting element.

8. The external rotor sealed motor according to claim 7, characterized in that: The second connecting outer ring is provided with a right-angle connecting part, which is used to fix the end of the outer shell. The inner diameter of the outer shell is provided with a sealing and fixing ring, which is provided with a sealing and fixing groove. The second sealing element is provided in the sealing and fixing groove and is used to abut against the second end cap.

9. The external rotor sealed motor according to claim 1, characterized in that: The base is provided with a stator connector, the outer diameter of which is provided with a stator mounting groove. The stator assembly is provided on the stator mounting groove and has a stator arm that extends toward the outer shell.

10. The external rotor sealed motor according to claim 9, characterized in that: The rotor assembly includes multiple magnets, one end of which is close to the first end cover, and the magnetic direction of the magnet is opposite to that of the stator winding arm.

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