Motor housing and servo motor

Abstract

The utility model provides a kind of motor casing and servo motor.The motor casing includes: casing (1);Front end cover (2), it is set in the front end of casing (1);Rear end cover (3), it is set in the rear end of casing (1), casing (1), front end cover (2) and rear end cover (3) form first installation cavity (5);Encoder cover (4), it is set in the side of rear end cover (3) away from front end cover (2), and form second installation cavity (6) between with rear end cover (3);First wire hole (7) is opened in rear end cover (3), and second wire hole (8) and third wire hole (9) are opened in the end plate of encoder cover (4) opposite with rear end cover (3).According to the motor casing and servo motor of the utility model, the volume can be reduced, and the motor cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and more specifically, to a motor housing and a servo motor. Background Technology

[0002] As a key component in modern industrial automation and precision control, servo motors have become an indispensable choice in various high-precision applications due to their superior performance—high precision, fast response, and excellent operational stability. From precise positioning and motion control on factory production lines to the precision operation of aerospace equipment, to assisting in delicate surgical procedures in medical equipment and intelligent driving in smart homes, servo motors are ubiquitous, playing a crucial role as core executors. With the rapid development of technology and the continuous upgrading of market demands, servo motors are not only required to be more efficient and reliable in traditional fields, but also need to expand into emerging fields such as wearable devices and microrobots. This places higher demands on the miniaturization, lightweighting, and precision of the motors.

[0003] like Figure 1 As shown, a traditional servo motor typically includes a power connector 1' and an encoder connector 2' to enable power supply and signal transmission between the motor and the control system. While these connectors ensure robust electrical connections and accurate data transmission, their physical form and mounting methods significantly limit the choice of motor installation location and environmental adaptability. The connector insertion direction and cable management scheme often require additional installation space and structural support, posing a significant challenge to modern equipment that pursues maximum space utilization and modular design. Utility Model Content

[0004] The main purpose of this invention is to provide a motor housing and a servo motor that can reduce size and lower motor cost.

[0005] To achieve the above objectives, according to one aspect of the present invention, a motor housing is provided, comprising:

[0006] chassis;

[0007] The front cover is located at the front of the casing;

[0008] The rear cover is located at the rear end of the housing, and the housing, front cover, and rear cover together form the first mounting cavity;

[0009] The encoder cover is located on the side of the rear cover away from the front cover, and forms a second mounting cavity between the rear cover and the front cover;

[0010] The rear cover has a first wire passage hole, and the encoder cover and the end plate opposite the rear cover have a second wire passage hole and a third wire passage hole.

[0011] Furthermore, the second wire hole and the first wire hole are coaxially arranged.

[0012] Furthermore, both the second and third wire guide holes are circular holes, and the center distance between the second and third wire guide holes is L1 ≥ d2 + d3, where d2 is the diameter of the second wire guide hole and d3 is the diameter of the third wire guide hole.

[0013] Furthermore, the center distance L1 between the second and third wire holes is ≥ 1.5*d2 + 1.5*d3.

[0014] Furthermore, the two ends of the first wire hole have rounded or straight chamfers.

[0015] Furthermore, the two ends of the second wire hole have rounded or straight chamfers.

[0016] Furthermore, the two ends of the third wire hole have rounded or straight chamfers.

[0017] Furthermore, the first wire hole, the second wire hole, and the third wire hole are circular, elliptical, or polygonal in shape.

[0018] According to another aspect of the present invention, a servo motor is provided, including a motor housing, which is the motor housing described above.

[0019] Furthermore, the servo motor also includes a stator and rotor assembly and an encoder. The stator and rotor assembly has a power cable, and the encoder has an encoder cable. The power cable passes through a first wire hole and a second wire hole in sequence, and the encoder cable passes through a third wire hole. The power cable is interference-fitted with the second wire hole, and the encoder cable is interference-fitted with the third wire hole.

[0020] By applying the technical solution of this utility model, a first wire-passing hole is provided on the rear end cover of the motor housing, and a second and third wire-passing holes are provided on the encoder cover. During the wiring process, the power cable can pass through the first and second wire-passing holes along the axial direction from inside the motor housing, and the encoder cable can pass through the third wire-passing hole from inside the motor housing. This allows both the power cable and the encoder cable to be routed from the rear end of the motor housing. This structure changes the cable exit position, eliminating the need to set motor power connectors and encoder connectors on the side wall of the motor housing, eliminating the traditional connector structure, realizing freedom in the motor cable exit direction, significantly reducing the overall size of the motor, improving installation flexibility, and reducing motor costs. This enables servo motors to be used in environments with narrow spaces and complex wiring, expanding the application scenarios of servo motors. Attached Figure Description

[0021] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model and do not constitute an undue limitation thereof. In the drawings:

[0022] Figure 1 A schematic diagram of the structure of a servo motor in the related technology is shown;

[0023] Figure 2 A schematic diagram of the servo motor according to an embodiment of the present invention is shown;

[0024] Figure 3 A side view of the servo motor according to an embodiment of the present invention is shown.

[0025] Figure 4 A first isometric structural schematic diagram of the rear end cover of the servo motor according to an embodiment of the present invention is shown.

[0026] Figure 5 A second isometric structural schematic diagram of the rear end cover of the servo motor according to an embodiment of the present invention is shown.

[0027] Figure 6 A schematic diagram of the structure of the rear end cover of the servo motor and the power cable in an embodiment of the present invention is shown.

[0028] Figure 7 A schematic diagram of the structure of the rear end cover of the servo motor according to an embodiment of the present invention is shown;

[0029] Figure 8 A first isometric structural schematic diagram of the encoder cover of a servo motor according to an embodiment of the present invention is shown.

[0030] Figure 9 A second isometric structural schematic diagram of the encoder cover of a servo motor according to an embodiment of the present invention is shown.

[0031] Figure 10 A schematic diagram of the structure of the encoder cover of the servo motor in conjunction with the power cable and encoder cable according to an embodiment of the present invention is shown.

[0032] Figure 11 A schematic diagram of the encoder cover of a servo motor according to an embodiment of the present invention is shown.

[0033] The above figures include the following reference numerals:

[0034] 1. Housing; 2. Front cover; 3. Rear cover; 4. Encoder cover; 5. First mounting cavity; 6. Second mounting cavity; 7. First wire hole; 8. Second wire hole; 9. Third wire hole; 10. Rounded chamfer; 11. Stator and rotor assembly; 12. Encoder; 13. Power cable; 14. Encoder cable. Detailed Implementation

[0035] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] See also Figures 2 to 11 As shown, according to an embodiment of the present invention, the motor housing includes: a housing 1; a front cover 2 disposed at the front end of the housing 1; a rear cover 3 disposed at the rear end of the housing 1, the housing 1, the front cover 2, and the rear cover 3 forming a first mounting cavity 5; an encoder cover 4 disposed on the side of the rear cover 3 away from the front cover 2, and forming a second mounting cavity 6 between the encoder cover 4 and the rear cover 3; a first wire passage hole 7 is provided on the rear cover 3, and a second wire passage hole 8 and a third wire passage hole 9 are provided on the end plate of the encoder cover 4 opposite to the rear cover 3.

[0037] In this embodiment, a first wire-passing hole 7 is provided on the rear end cover 3 of the motor housing, and a second wire-passing hole 8 and a third wire-passing hole 9 are provided on the encoder cover 4. During the wiring process, the power cable 13 can pass through the first wire-passing hole 7 and the second wire-passing hole 8 along the axial direction from inside the motor housing, and the encoder cable 14 can pass through the third wire-passing hole 9 from inside the motor housing. This allows both the power cable 13 and the encoder cable 14 to be routed from the rear end of the motor housing. This structure changes the cable exit position, eliminating the need to set the motor power connector and encoder connector on the side wall of the motor housing, eliminating the traditional connector structure, realizing freedom in the motor exit direction, significantly reducing the overall size of the motor, improving installation flexibility, reducing motor cost, and enabling the servo motor to be applied in environments with narrow space and complex wiring, thus expanding the application scenarios of the servo motor.

[0038] Taking a servo motor of the same specification as an example, when using a traditional servo motor, because the motor housing has a motor power connector and an encoder connector arranged radially, the minimum diameter of the cylindrical space required for motor installation is [missing information]. When using the servo motor in this embodiment, the minimum diameter of the cylindrical space required for motor installation is [diameter missing]. Compared to traditional servo motors, it reduces the space required for motor installation by 40%, giving servo motors the characteristics of miniaturization and versatility.

[0039] In one embodiment, the second wire hole 8 and the first wire hole 7 are coaxially arranged.

[0040] The coaxial arrangement of the second cable guide hole 8 and the first cable guide hole 7 ensures the stability and alignment of the power cable 13, reducing its sway during movement and thus protecting the solder joints. The coaxial arrangement of the second cable guide hole 8 and the first cable guide hole 7 allows the power cable 13 to pass along a straight path, reducing bending stress and extending its service life. This embodiment, by coaxially arranging the second cable guide hole 8 and the first cable guide hole 7, enhances the mechanical stability of the power cable 13 and avoids the risk of signal interruption.

[0041] In some embodiments, the protection effect of the power cable 13 can be further improved by adding a support structure or using other materials, thereby solving the connection reliability problem in high vibration environments.

[0042] In one embodiment, both the second wire hole 8 and the third wire hole 9 are circular holes, and the center distance L1 between the second wire hole 8 and the third wire hole 9 is greater than or equal to d2 + d3, where d2 is the diameter of the second wire hole 8 and d3 is the diameter of the third wire hole 9.

[0043] By ensuring that the center distance L1 between the second wire guide hole 8 and the third wire guide hole 9 is at least equal to the sum of the two hole diameters d2 and d3, sufficient distance is guaranteed between the second wire guide hole 8 and the third wire guide hole 9. This ensures the structural strength of the encoder cover 4 located between the second wire guide hole 8 and the third wire guide hole 9, effectively preventing mutual contact and interference between the power cable 13 and the encoder cable 14 during the high-speed rotation and vibration of the servo motor. This ensures the integrity of the cable and the quality of signal transmission, while also providing more operating space for the cable, reducing the risk of wear caused by movement, and enhancing the stability and durability of the motor during long-term operation.

[0044] In one embodiment, the center distance L1 between the second wire passage hole 8 and the third wire passage hole 9 is ≥ 1.5*d2 + 1.5*d3. This limitation further ensures sufficient spacing between the second wire passage hole 8 and the third wire passage hole 9, providing adequate spacing width for the encoder cover 4 between them. This provides sufficient structural strength and more effectively prevents physical contact and signal crosstalk between cables, improving cable protection performance and the overall electromagnetic compatibility of the motor.

[0045] In one embodiment, the two ends of the first wire hole 7 have rounded chamfers 10 or straight chamfers.

[0046] In one embodiment, the two ends of the second wire hole 8 have rounded chamfers 10 or straight chamfers.

[0047] In one embodiment, the two ends of the third wire hole 9 have rounded chamfers 10 or straight chamfers.

[0048] Using rounded chamfers or straight chamfers at both ends of the cable guide hole can significantly reduce the mechanical stress on the power cable 13 and encoder cable 14 when they pass through the motor housing. This prevents the power cable 13 and encoder cable 14 from being damaged by sharp edges during high-speed movement and vibration, ensuring that the cables pass through the cable guide hole without damage. This ensures the integrity of the power cable 13 and encoder cable 14 and the reliability of motor operation, avoids signal interruption caused by scratches on the cable sheath due to the edge of the cable guide hole, and improves the overall performance and durability of the servo motor.

[0049] In one embodiment, the first wire hole 7, the second wire hole 8, and the third wire hole 9 are circular, elliptical, or polygonal in shape.

[0050] The first wire guide hole 7, the second wire guide hole 8, and the third wire guide hole 9 are designed as circles, ellipses, or polygons, which can be optimally matched according to the specific size and material characteristics of the power cable 13 and the encoder cable 14. This ensures that the cables pass smoothly and are stably positioned during the high-speed dynamic process of the servo motor, effectively avoiding signal attenuation and mechanical damage caused by cable twisting or squeezing, thereby improving the overall efficiency and operational safety of the motor system.

[0051] In one embodiment, the shapes of the first wire hole 7, the second wire hole 8, and the third wire hole 9 are adapted to the shape of the cable inside them, ensuring reliable fit and sealing between them.

[0052] See also Figures 2 to 11 As shown, according to an embodiment of the present invention, the servo motor includes a motor housing, which is the motor housing described above.

[0053] In one embodiment, the servo motor further includes a stator-rotor assembly 11 and an encoder 12. The stator-rotor assembly 11 has a power cable 13, and the encoder 12 has an encoder cable 14. The power cable 13 passes sequentially through a first wire guide hole 7 and a second wire guide hole 8, and the encoder cable 14 passes through a third wire guide hole 9. The power cable 13 and the second wire guide hole 8 are interference-fitted, and the encoder cable 14 and the third wire guide hole 9 are interference-fitted. Specifically, the stator-rotor assembly 11 is disposed in a first mounting cavity 5, and the encoder 12 is disposed in a second mounting cavity 6.

[0054] In this embodiment, to prevent the power cable 13 from shaking inside the motor during motor operation after passing through the first wire hole 7 on the rear end cover, which could cause the solder joint to fall off, the diameter d1 of the first wire hole 7 and the diameter D1 of the power cable 13 must satisfy the relationship D1≥d1 to achieve a small interference fit. Moreover, since the power cable 13 is made of rubber and has a certain elasticity, this fit can ensure that the position of the power cable 13 relative to the rear end cover remains unchanged.

[0055] To prevent the power cable 13 and encoder cable 14 from shaking inside the encoder cover 4 during motor operation after passing through the second wire hole 8 and the third wire hole 9, which could cause the solder joints to fall off, the diameters d2 and d3 of the second wire hole 8 and the third wire hole 9, respectively, must satisfy the relationships D1≥d2 and D2≥d3 with respect to the diameters D1 and D2 of the power cable 13 and encoder cable 14, respectively. This achieves a small interference fit. Furthermore, since the power cable 13 and encoder cable 14 are made of rubber and have a certain degree of elasticity, this fit ensures that the positions of the power cable 13 and encoder cable 14 relative to the encoder cover 4 remain unchanged.

[0056] In one embodiment, the third wire guide hole 9 is positioned at the exit point of the encoder cable 14, allowing the encoder cable 14 to pass directly through it without bending. This reduces physical deformation and additional tension on the encoder cable 14 within the servo motor, effectively preventing cable wear and signal quality degradation caused by bending, and improving the mechanical stability and data transmission accuracy of the encoder cable 14. Furthermore, the straight-line exit simplifies cable installation and maintenance, reduces the failure rate, and ensures the servo motor maintains good performance and a long service life under various operating environments.

[0057] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0058] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this utility model described herein can be implemented in sequences other than those illustrated or described herein.

[0059] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A motor housing, characterized in that, include: Casing (1); A front cover (2) is provided at the front end of the housing (1); A rear end cover (3) is disposed at the rear end of the housing (1), and the housing (1), the front end cover (2) and the rear end cover (3) form a first mounting cavity (5); An encoder cover (4) is disposed on the side of the rear end cover (3) away from the front end cover (2) and forms a second mounting cavity (6) between the rear end cover (3); The rear end cover (3) is provided with a first wire hole (7), and the encoder cover (4) is provided with a second wire hole (8) and a third wire hole (9) on the end plate opposite to the rear end cover (3).

2. The motor housing according to claim 1, characterized in that, The second wire hole (8) and the first wire hole (7) are coaxially arranged.

3. The motor housing according to claim 1, characterized in that, Both the second wire-passing hole (8) and the third wire-passing hole (9) are round holes. The center distance L1 between the second wire-passing hole (8) and the third wire-passing hole (9) is ≥ d2 + d3, where d2 is the diameter of the second wire-passing hole (8) and d3 is the diameter of the third wire-passing hole (9).

4. The motor housing according to claim 3, characterized in that, The center distance L1 between the second wire hole (8) and the third wire hole (9) is ≥ 1.5*d2+1.5*d3.

5. The motor housing according to claim 1, characterized in that, The first wire hole (7) has rounded chamfers (10) or straight chamfers at both ends.

6. The motor housing according to claim 1, characterized in that, The two ends of the second wire hole (8) have rounded chamfers (10) or straight chamfers.

7. The motor housing according to claim 1, characterized in that, The two ends of the third wire hole (9) have rounded chamfers (10) or straight chamfers.

8. The motor housing according to claim 1, characterized in that, The first wire hole (7), the second wire hole (8) and the third wire hole (9) are circular, elliptical or polygonal in shape.

9. A servo motor, comprising a motor housing, characterized in that, The motor housing is the motor housing according to any one of claims 1 to 8.

10. The servo motor according to claim 9, characterized in that, The servo motor further includes a stator and rotor assembly (11) and an encoder (12). The stator and rotor assembly (11) has a power cable (13), and the encoder (12) has an encoder cable (14). The power cable (13) passes through the first wire hole (7) and the second wire hole (8) in sequence, and the encoder cable (14) passes through the third wire hole (9). The power cable (13) is interference-fitted with the second wire hole (8), and the encoder cable (14) is interference-fitted with the third wire hole (9).

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