Annular large hollow direct drive motor

Abstract

The invention provides an annular large hollow direct-drive motor, and relates to the technical field of direct-drive motors. An annular large hollow direct drive motor comprises a stator, a rotor, a base, a rotating shaft, a bearing and an encoder. The stator is fixedly arranged on the base, the rotor is located on the inner side of the stator, a certain gap is formed between the outer wall of the rotor and the inner wall of the stator, the bearing is arranged between the opposite sides of the rotating shaft and the rotor, and the rotating shaft and the rotor are both coaxially installed with the stator. The encoder is arranged on the base, the encoder and the bearing are arranged in the axial direction, the gland is installed on the base and attached to the side, close to the rotor, of the bearing, and the heat dissipation dustproof assembly comprises a heat dissipation fan arranged on the outer side of the rotating shaft. According to the invention, the structure of the motor is more compact, and the flat annular structure with low thickness and large hollow is realized.

Description

Technical Field

[0001] The present application relates to the technical field of direct-drive motors, and in particular to a large-hollow annular direct-drive motor. Background Art

[0002] In the field of modern industry and precision control, direct-drive torque motors are favored due to their simple structure, high control accuracy and fast response speed. In the design of direct-drive torque motors, the power, bearings and encoders in the motor are usually arranged along the axial or radial direction of the motor to achieve efficient operation of the motor.

[0003] However, with the diversification of application scenarios, especially in those situations that require high compactness and large hollow space, more stringent requirements are placed on direct-drive torque motors. These requirements include reducing the height of the motor while maintaining the motor output torque, and increasing the hollow space to adapt to space-constrained environments and reduce weight.

[0004] Generally, the axial arrangement of power, bearings and encoders can reduce the height of the motor, but it will sacrifice the hollow space. Although the radial arrangement provides a larger hollow space, it increases the overall height of the motor. Therefore, a ring-shaped large hollow direct-drive motor is proposed to solve the above problems. Summary of the invention

[0005] In order to further reduce the height of the motor and expand the hollow space of the motor, the present application provides a ring-shaped large hollow direct-drive motor.

[0006] The present application provides a large annular hollow direct-drive motor, which adopts the following technical solution: A large annular hollow direct-drive motor, comprising: a stator, a rotor, a base, a rotating shaft, a bearing and an encoder; The stator is fixed on the base, the rotor is located on the inner side of the stator, and there is a certain gap between the outer wall of the rotor and the inner wall of the stator. The bearing is arranged between the rotating shaft and the opposite side of the rotor. The rotating shaft and the rotor are both coaxially installed with the stator. The encoder is arranged on the base and the encoder and the bearing are arranged axially.

[0007] By adopting the above technical solution, the annular large hollow direct-drive motor can effectively reduce the overall height while increasing the hollow space, meeting the application requirements of space-constrained applications. The power part and the bearing are arranged radially, and the bearing and the encoder are arranged axially, which not only ensures the output torque of the motor, but also optimizes the layout of internal components, achieving a dual improvement in height and hollow space.

[0008] Preferably, it also includes a pressure cover, which is installed on the base and fits with a side of the bearing close to the rotor.

[0009] By adopting the above technical solution, the pressure cover is installed on the base and fits with the side of the bearing close to the rotor, which effectively improves the overall stability and reliability of the motor. It not only helps to reduce the wear caused by vibration during operation, but also enhances the stability of the motor when running at high speed, thereby extending the service life of the motor.

[0010] Preferably, it further comprises a heat dissipation and dustproof assembly and a housing, wherein the heat dissipation and dustproof assembly comprises a heat dissipation fan arranged outside the rotating shaft, and the heat dissipation fan is located in a connecting cavity arranged between the rotating shaft and the base; The base is provided with a ventilation channel, the shell is connected to the base, the stator is located in a connecting cavity formed by the base and the shell, the two ends of the ventilation channel are respectively connected to the connecting cavity and the connecting cavity, the base is provided with an air inlet hole, the shell is provided with an air outlet hole, the air inlet hole is connected to the connecting cavity, and the air outlet hole is connected to one side of the connecting cavity.

[0011] By adopting the above technical solution, the cooling fan is arranged on the outside of the rotating shaft and operates in the connecting cavity. When the motor is working, the cooling fan generates airflow along with the rotation of the rotating shaft. The airflow passes through the air inlet, the connecting cavity, the ventilation channel, the connecting cavity and the air outlet in sequence. The stator located in the connecting cavity is cooled by the airflow, thereby effectively taking away the heat generated inside the motor and improving the heat dissipation efficiency of the motor.

[0012] Preferably, the heat dissipation and dustproof assembly further comprises a protective shell movably connected to the base, and the protective shell opens and closes the air inlet and the air outlet by moving itself.

[0013] By adopting the above technical scheme, the annular large hollow direct-drive motor can not only effectively dissipate heat, but also reduce the situation of dust entering the inside of the motor, thereby improving the reliability and service life of the motor. At the same time, the protective shell can flexibly open and close the air inlet and outlet holes of the ventilation channel according to actual needs. When the motor is working, the protective shell opens the air inlet and outlet holes to allow the air flow to flow smoothly and take away the heat generated inside the motor; when the motor is not working, the protective shell closes the air inlet and outlet holes to reduce external dust and impurities from entering the inside of the motor, thereby further ensuring the cleanliness of the inside of the motor.

[0014] Preferably, the protective shell is provided with heat dissipation fins.

[0015] By adopting the above technical solution, the heat dissipation fins are arranged on the protective shell to further increase the heat dissipation area, improve the heat dissipation efficiency, ensure that the temperature of the motor is effectively controlled during long-term operation, and extend the service life of the motor. At the same time, the design of the heat dissipation fins can also enhance air flow and further improve the heat dissipation effect.

[0016] Preferably, a driving member is provided on the outer side of the base, the driving member is connected to one side of the protective shell, and the driving member provides power to drive the protective shell to move.

[0017] By adopting the above technical solution, the setting of the driving part enables the protective shell to move automatically, thereby realizing the opening and closing of the air inlet and outlet holes of the ventilation channel, and enhancing the flexibility and reliability of the heat dissipation system. When the motor is working, the driving part drives the protective shell to open the air inlet and outlet holes, which facilitates the smooth flow of air and improves the heat dissipation efficiency; when the motor stops working, the driving part drives the protective shell to close the air inlet and outlet holes, effectively reducing the situation of dust entering the motor and extending the service life of the motor.

[0018] Preferably, a heat conducting strip is provided in the communicating cavity.

[0019] By adopting the above technical solution, the thermal conductive strip can more effectively improve the heat conduction efficiency, make the heat dissipation more uniform, thereby reducing the occurrence of local overheating, thereby improving the operating stability and service life of the motor.

[0020] Preferably, a mounting ring 87 is provided in the connecting cavity 9 , and the mounting ring 87 is located at one side of the ventilation channel 84 .

[0021] By adopting the above technical solution, the mounting ring can, when the cooling fan rotates and generates airflow through the air inlet hole, the air outlet hole, the connecting channel, the connecting cavity and the connecting cavity to cool the stator, the generated airflow can be more concentratedly transported from the connecting cavity to the connecting channel, thereby realizing faster cooling of the stator in the connecting cavity and further improving the cooling efficiency of the stator.

[0022] Preferably, it also includes an air pressure sensor and an intake pipe arranged on the base, the sensor is located in the connecting cavity, the intake pipe is arranged on the base and a valve is installed on the intake pipe, an installation cavity is provided between the rotating shaft and the base, the bearing is located in the installation cavity and fits with the inner wall of the installation cavity, the installation cavity and the connecting cavity are connected through a first connecting channel arranged between the rotating shaft and the base, and one side of the installation cavity is connected with a second connecting channel arranged between the rotating shaft and the rotor.

[0023] By adopting the above technical solution, not only can air be introduced into the motor through the intake pipe when the motor is working, so that the airflow can circulate better and effectively take away the heat generated inside the motor to improve the heat dissipation efficiency, but the air intake through the intake pipe can also cooperate with the air pressure sensor to detect whether the bearing is installed properly, thereby ensuring the normal operation of the device and facilitating the subsequent maintenance and inspection of the motor.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. By arranging the power and bearing radially, and the bearing and encoder axially, the internal space layout of the motor is effectively optimized, so that the height of the motor itself is reduced without reducing the output torque, and the hollow space of the motor is greatly expanded, which better solves the problem of difficulty in balancing the height and hollow space; 2. The heat dissipation and dustproof components can effectively improve the heat dissipation performance of the motor, improve the temperature management of the motor during long-term operation, and extend the service life of the motor. When the motor is not in use, the vents can be automatically closed to prevent external dust from entering the motor, further ensuring the cleanliness and reliability of the motor; 3. By using the combination of the intake pipe and the airflow sensor, the installation status of the bearing can be accurately detected, thereby ensuring the correct assembly of the various components of the motor, improving the reliability and safety of the motor, and facilitating subsequent maintenance and overhaul. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the explosion structure of Example 1 of the present application; Figure 2 is a schematic cross-sectional structure diagram of Example 1 of the present application; Figure 3 is a schematic cross-sectional structure diagram of Example 2 of the present application; Figure 4 This is the embodiment 2 of the present application Figure 3 A schematic diagram of the enlarged structure at A in the middle; Figure 5 It is a schematic diagram of the cross-sectional structure of the air pressure sensor and the intake pipe of Example 2 of the present application.

[0026] Explanation of the reference numerals: 1. stator; 101. coil assembly; 2. rotor; 201. turntable; 202. permanent magnet; 3. base; 4. rotating shaft; 5. bearing; 6. encoder; 7. pressure cover; 8. heat dissipation and dustproof assembly; 81. cooling fan; 811. connecting ring; 812. connecting rod; 813. impeller; 82. protective shell; 83. cooling fins; 84. ventilation channel; 85. thermal conductive strip; 86. driving member; 87. mounting ring; 88. air inlet; 89. air outlet; 9. connecting cavity; 10. mounting cavity; 11. air pressure sensor; 12. air inlet pipe; 13. sealing plate; 14. outer shell; 15. first connecting channel; 16. second connecting channel; 17. connecting cavity. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-5 This application is described in further detail.

[0028] Embodiment 1: Embodiment 1 of the present application provides a large-hollow, annular direct-drive motor.

[0029] refer to Figure 1 and Figure 2 The annular large hollow direct-drive motor includes a stator 1, a rotor 2, a base 3, a rotating shaft 4, a bearing 5, an encoder 6, a pressure cover 7, a sealing plate 13 and a shell 14, wherein the sealing plate 13 is connected to the base 3, the shell 14 is connected to one end of the base 3 away from the sealing plate 13, the stator 1 is installed on the base 3, and the stator 1 is located in a connecting cavity 17 formed by the base 3 and the shell 14, one end of the stator 1 is connected to one side of the base 3 and the other end is in contact with the inner wall of the shell 14.

[0030] The rotor 2 is located on the inner side of the stator 1 and there is a certain gap between the outer wall of the rotor 2 and the inner wall of the stator 1. The bearing 5 is arranged between the opposite side of the shaft 4 and the rotor 2. The shaft 4 and the rotor 2 are coaxially installed with the stator 1. The bearing 5 and the stator 1, the rotor 2 and the shaft 4 are radially arranged. The encoder 6 is arranged on the base 3 and the encoder 6 and the bearing 5 are axially arranged. The direct-drive torque motor is flat as a whole, with a height-to-diameter ratio of 1:4. At the same time, the direct-drive torque motor is large and hollow, and the inner diameter is 1:2 to the outer diameter.

[0031] Among them, the stator 1 is provided with a coil assembly 101, the coil can be a silicon steel sheet, and the coil assembly 101 is fastened to the base 3 by screws. The rotor 2 is provided with a permanent magnet 202 and a turntable 201, and the turntable 201 is connected to the inner side of the permanent magnet 202. The gland 7 is installed on the base 3, and the gland 7 is located inside the cavity of the turntable 201 close to the bearing 5, and fits and presses the outer ring of the bearing 5. The bearing 5, the turntable 201, the permanent magnet 202 and the coil assembly 101 form a radial arrangement. The rotating shaft 4 is located on the inner side of the base 3 and connected to the turntable 201. The rotating shaft 4 fits and presses the inner ring of the bearing 5 with the turntable 201, and is coaxially installed with the stator 1.

[0032] The encoder 6 includes a first encoder and a second encoder. The first encoder is installed on the rotating shaft 4 and rotates with the rotating shaft. The second encoder is installed on the base 3. Both are arranged axially with the bearing 5. The stator 1 drives the rotor 2 to rotate, thereby driving the rotating shaft 4 to rotate, and then the motor works.

[0033] The implementation principle of a large hollow direct-drive motor in annular shape in the first embodiment of the present application is as follows: By arranging the stator 1, rotor 2, rotating shaft 4 and bearing 5 radially, and arranging the bearing 5 and encoder 6 axially, the direct-drive torque motor can reasonably arrange the internal space without losing the output torque, which not only reduces the height of the motor, but also further expands the hollowness of the motor, making the motor structure more compact and realizing a flat ring structure with low thickness and large hollowness.

[0034] Embodiment 2: Embodiment 2 of the present application provides a large-hollow, annular direct-drive motor.

[0035] refer to Figure 3 and Figure 4 The difference between Example 2 of the present application and Example 1 is that it also includes a heat dissipation and dustproof component 8, which includes a heat dissipation fan 81 fixed to the outside of the rotating shaft 4, a protective shell 82, and a driving member 86 installed on the base 3, and the heat dissipation fan 81 is located in a connecting cavity 9 set between the rotating shaft 4 and the base 3.

[0036] The base 3 is provided with a ventilation channel 84, and the two ends of the ventilation channel 84 are respectively connected with the connecting cavity 17 and the connecting cavity 9. The base 3 is provided with an air inlet 88, and the housing 14 is provided with an air outlet 89. The air inlet 88 is connected with the connecting cavity 9, and the air outlet 89 is connected with one side of the connecting cavity 17. The rotation of the rotating shaft 4 will cause the heat dissipation fan 81 to rotate. The heat dissipation fan 81 cooperates with the connecting cavity 9, the connecting cavity 17, the air inlet 88, the air outlet 89 and the ventilation channel 84 to generate airflow, so that the airflow passes through the stator 1 and the heat conductive strip 85, and takes away the heat generated by the coil assembly 101 on the stator 1 and the heat of the coil assembly 101 absorbed by the heat conductive strip 85, thereby further improving the heat dissipation efficiency.

[0037] The driving member 86 is connected to the outer side of the protective shell 82. The driving member 86 can be a cylinder, which is convenient for providing power to drive the protective shell 82 to move, and then the air inlet 88 and the air outlet 89 are blocked or opened through the movement of the protective shell 82, so that under certain circumstances, dust can be further prevented from entering the interior of the motor and affecting its service life. At the same time, a sealing ring is provided on the inner side of the protective shell 82 to further prevent dust and moisture from entering the interior of the motor. The protective shell 82 is also provided with cooling fins 83, which can increase the heat dissipation area and improve the heat dissipation efficiency.

[0038] A plurality of heat-conducting strips 85 are provided in the connecting cavity 17 . The coil assembly 101 cooperates with the permanent magnet 202 to drive the turntable 201 and the shaft 4 to rotate. When the motor is working, the heat generated by the coil assembly 101 can be better absorbed by the heat-conducting strips 85 .

[0039] refer to Figure 4 and Figure 5The heat dissipation fan 81 includes a connecting ring 811, a plurality of connecting rods 812 and an impeller 813. The inner wall of the connecting ring 811 is fixedly connected to the outer side of the rotating shaft 4. The outer side of the connecting ring 811 is connected to a plurality of connecting rods 812. The side of the connecting rod 812 away from the connecting ring 811 is connected to the impeller 813. A mounting ring 87 is provided in the connecting chamber 9. The mounting ring 87 is located on one side of the ventilation channel 84. The impeller 813 is located on one side of the mounting ring 87. When the connecting ring 811 rotates with the rotating shaft 4, the impeller 813 rotates to form a low-pressure area. The outside air is sucked into the connecting chamber 9 through the air inlet 88 and passes through the impeller 813. The airflow generated by the impeller 813 can be more concentratedly transported from the connecting chamber 9 to the ventilation channel 84 through the mounting ring 87, thereby realizing the cooling of the stator 1 in the connecting chamber 17 more quickly, further improving the cooling efficiency of the stator 1, and further ensuring the smooth flow of the airflow when the motor is working.

[0040] At the same time, the heat absorbed by the thermal conductive strip 85 and the heat generated by the coil assembly 101 are taken away to improve the heat dissipation efficiency. By adding the heat dissipation and dustproof assembly 8, not only the heat dissipation effect of the motor can be improved and the service life of the motor can be extended, but also dust can be prevented from entering the inside of the motor, thereby improving the reliability and safety of the motor.

[0041] refer to Figure 5 , and also includes an air pressure sensor 11 and an air intake pipe 12 arranged on the base 3. The sensor is located in the connecting cavity 9. The air intake pipe 12 is arranged on the base 3 and a valve is installed on the air intake pipe 12. The valve can be a manual valve or an electric valve. When the motor is working, air is introduced into the motor through the air intake pipe 12, and the heat dissipation and dustproof component 8 is cooperated to make the air flow better, effectively take away the heat generated inside the motor, and improve the heat dissipation efficiency.

[0042] An installation cavity 10 is provided between the rotating shaft 4 and the base 3. The bearing 5 is located in the installation cavity 10 and fits against the inner wall of the installation cavity 10. The installation cavity 10 is connected to the connecting cavity 9 through a first connecting channel 15 provided between the rotating shaft 4 and the base 3. One side of the installation cavity 10 is connected to a second connecting channel 16 provided between the rotating shaft 4 and the rotor 2. The air intake through the intake pipe 12 cooperates with the air pressure sensor 11 to detect whether the airflow entering the motor connecting cavity 9 can flow out through the connecting channel, and then check the internal air pressure to detect whether the bearing 5 is installed properly, so as to further ensure the normal installation and operation of the device, and also facilitate the subsequent maintenance and inspection of the motor.

[0043] The implementation principle of a large hollow direct-drive motor in annular shape in Example 2 of the present application is as follows: When the motor is working, the driving member 86 drives the protective shell 82 to open the air inlet 88 and the air outlet 89. The cooling fan 81 generates airflow as the rotating shaft 4 rotates, and takes away the heat through the connecting cavity 9 and the ventilation channel 84. The mounting ring 87 further ensures smoother airflow and improves the heat dissipation efficiency. It can also cooperate with the air intake pipe 12 to generate more airflow, thereby facilitating faster airflow inside the motor and effectively improving the heat dissipation efficiency. The multiple heat dissipation fins 83 on the protective shell 82 can also further increase the heat dissipation area and improve the heat dissipation efficiency.

[0044] When the motor stops working, the driving member 86 drives the protective shell 82 to close the air inlet 88 and the air outlet 89, effectively reducing the dust from entering the motor and extending the service life of the motor. At the same time, the air pressure sensor 11 and the air inlet pipe 12 can be used to detect the installation of the bearing 5 and facilitate the inspection and maintenance of the motor.

[0045] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A large hollow annular direct drive motor, characterized in that: include: A stator (1), a rotor (2), a base (3), a rotating shaft (4), a bearing (5), and an encoder (6); The stator (1) is fixed on the base (3), the rotor (2) is located on the inner side of the stator (1), and a certain gap is formed between the outer wall of the rotor (2) and the inner wall of the stator (1), the bearing (5) is arranged between the rotating shaft (4) and the opposite side of the rotor (2), the rotating shaft (4) and the rotor (2) are both coaxially mounted with the stator (1), and the encoder (6) is arranged on the base (3), and the encoder (6) and the bearing (5) are arranged axially.

2. The annular large hollow direct drive motor according to claim 1, characterized in that: It also includes a pressure cover (7), which is mounted on the base (3) and fits against a side of the bearing (5) close to the rotor (2).

3. The annular large hollow direct drive motor according to claim 1, characterized in that: It also includes a heat dissipation and dustproof component (8) and a housing (14), wherein the heat dissipation and dustproof component (8) includes a heat dissipation fan (81) arranged outside the rotating shaft (4), and the heat dissipation fan (81) is located in a connecting cavity (9) arranged between the rotating shaft (4) and the base (3); The base (3) is provided with a ventilation channel (84), the housing (14) is connected to the base (3), the stator (1) is located in a connecting cavity (17) formed by the base (3) and the housing (14), the two ends of the ventilation channel (84) are respectively connected to the connecting cavity (17) and the connecting cavity (9), the base (3) is provided with an air inlet hole (88), the housing (14) is provided with an air outlet hole (89), the air inlet hole (88) is connected to the connecting cavity (9), and the air outlet hole (89) is connected to one side of the connecting cavity (17).

4. The annular large hollow direct drive motor according to claim 3, characterized in that: The heat dissipation and dustproof component (8) further comprises a protective shell (82) movably connected to the base (3), wherein the protective shell (82) opens and closes the air inlet (88) and the air outlet (89) by moving itself.

5. The annular large hollow direct drive motor according to claim 4, characterized in that: The protective shell (82) is provided with heat dissipation fins (83).

6. The annular large hollow direct drive motor according to claim 5, characterized in that: A driving member (86) is provided on the outside of the base (3), the driving member (86) being connected to one side of the protective shell (82), and the driving member (86) providing power to drive the protective shell (82) to move and open and close the air inlet (88) and the air outlet (89).

7. The annular large hollow direct drive motor according to claim 3, characterized in that: A heat conducting strip (85) is provided in the communication cavity (17).

8. The annular large hollow direct drive motor according to claim 7, characterized in that: A mounting ring (87) is provided in the connecting cavity (9), and the mounting ring (87) is located on one side of the ventilation channel (84).

9. The annular large hollow direct drive motor according to claim 4, characterized in that: It also includes an air pressure sensor (11) and an air intake pipe (12) arranged on the base (3); The sensor is located in the connecting cavity (9), the air intake pipe (12) is arranged on the base (3) and a valve is installed on the air intake pipe (12), an installation cavity (10) is provided between the rotating shaft (4) and the base (3), the bearing (5) is located in the installation cavity (10) and is in contact with the inner wall of the installation cavity (10), the installation cavity (10) and the connecting cavity (9) are connected via a first connecting channel (15) provided between the rotating shaft (4) and the base (3), and one side of the installation cavity (10) is connected to a second connecting channel (16) provided between the rotating shaft (4) and the rotor (2).

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