Direct-drive servo motor

Abstract

The invention relates to the technical field of servo motors, in particular to a direct-drive servo motor which comprises a motor shell, a rotor is rotationally arranged in the motor shell, a stator is arranged on the inner wall of the motor shell around the rotor, a noise reduction shell covers the outer side of the motor shell, and a sound insulation interlayer is arranged in the noise reduction shell. A cooling shell is arranged between the noise reduction shell and the motor shell, a cooling cavity is formed in the cooling shell, a cooling water tank is installed at the rear end of the motor shell, a water pump is arranged in the cooling water tank, the water outlet end of the water pump is communicated with the cooling cavity, and the water inlet end of the cooling water tank is communicated with the cooling cavity. And a cooling mechanism for cooling the cooling water tank is mounted on the surface of the cooling water tank. The problem that in the prior art, a sound insulation material is simply used for wrapping a servo motor to improve the noise reduction effect, and consequently the heat dissipation performance is reduced is solved.

Description

Technical Field

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

[0002] In the field of modern industrial automation, direct-drive servo motors have been widely used due to their excellent performance. However, in actual use, direct-drive servo motors still face some problems that need to be solved.

[0003] Noise is one of them. When the direct-drive servo motor is running, it will generate a certain degree of noise due to the effect of electromagnetic force, vibration of mechanical parts, air flow and other factors. This noise will not only interfere with the working environment and affect the comfort and work efficiency of operators, but also in some application scenarios with strict noise requirements, such as medical equipment and scientific research laboratories, excessive noise may also affect the normal operation of the equipment and the accuracy of experimental data.

[0004] The heat dissipation challenge should not be ignored either. As the power density of direct-drive servo motors continues to increase, the heat generated during operation also increases significantly. If the heat cannot be dissipated in a timely and effective manner, the internal temperature of the motor will rise rapidly, which will lead to a decline in motor performance, such as reduced output torque, unstable speed, etc. In severe cases, it may even damage the internal components of the motor and shorten the service life of the motor.

[0005] At present, although there are some solutions for direct-drive servo motor noise and heat dissipation, the results are often unsatisfactory. Common heat dissipation methods, such as fan heat dissipation and natural convection heat dissipation, may not meet the heat dissipation requirements when dealing with high-power operation; in terms of noise reduction, simply wrapping the servo motor with sound insulation materials to improve the noise reduction effect, but this will lead to reduced heat dissipation performance.

[0006] Therefore, in order to meet the higher performance requirements of direct-drive servo motors in industrial applications and provide a quiet, stable and efficient operating environment, it is necessary to develop a new type of direct-drive servo motor to solve the two key problems of noise and heat dissipation. Summary of the invention

[0007] The object of the present invention is to provide a direct-drive servo motor to solve the problem in the prior art that simply using sound insulation materials to wrap the servo motor to improve the noise reduction effect will lead to reduced heat dissipation performance.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions: A direct-drive servo motor comprises a motor housing, a rotor rotatably arranged in the motor housing, a stator arranged on the inner wall of the motor housing surrounding the rotor, a noise reduction housing provided on the outer cover of the motor housing, a sound insulation interlayer provided in the noise reduction housing, a cooling housing provided between the noise reduction housing and the motor housing, a cooling chamber provided in the cooling housing, a cooling water tank installed at the rear end of the motor housing, a water pump provided in the cooling water tank, a water outlet end of the water pump being connected to the cooling chamber, a water inlet end of the cooling water tank being connected to the cooling chamber, and a cooling mechanism for cooling the cooling water tank being installed on the surface of the cooling water tank.

[0009] A further technical solution is that the noise reduction housing includes a noise reduction pipe and a front plate, the noise reduction pipe is fitly mounted on the outer wall of the motor housing, the front plate is fitly installed on the front end of the motor housing, and the edge of the front plate is connected to the front end of the noise reduction pipe, the rear end of the noise reduction pipe extends to the rear of the motor housing, and a heat dissipation groove is formed at the rear end of the motor housing.

[0010] A further technical solution is that the cooling mechanism includes a semiconductor refrigeration sheet, a heat sink and a silent cooling fan, the cooling water tank, the heat sink and the silent cooling fan are installed in the heat sink in sequence from front to back, the surface of the cooling water tank is recessed with a cooling groove, the cold end of the semiconductor refrigeration sheet is fitted on the bottom of the cooling groove, the heat sink is installed on the hot end of the semiconductor refrigeration sheet, the air outlet side of the silent cooling fan is aligned with the heat sink, and the surface of the noise reduction tube is provided with air outlet holes connected to the heat sink, and the air outlet holes are aligned with the heat sink.

[0011] A further technical solution is that the heat sink includes a heat-conducting flat plate and a plurality of heat-conducting fins vertically arranged on the heat-conducting flat plate.

[0012] A further technical solution is that the edge of the cooling water tank is sealed with the wall of the heat dissipation tank, and a cable gap is left between the cooling water tank and the rear end of the motor housing, the outer wall of the noise reduction pipe is provided with a threading hole connected to the cable gap, a sound insulation layer is provided on the side of the cooling water tank facing the motor housing, and a heat insulation coating is provided on the surface of the water tank.

[0013] A further technical solution is that a cooling ring groove is arranged in a surface depression surrounding the motor housing, the rear groove wall of the cooling ring groove extends to be connected with the rear end of the motor housing, the cooling housing is embedded in the cooling ring groove, and the outer wall of the cooling housing is flush with the outer wall of the motor housing.

[0014] A further technical solution is that the materials of the sound insulation interlayer and the sound insulation bonding layer are both aerogel sound insulation materials.

[0015] A further technical solution is that a first temperature sensor is installed in the cooling water tank, a second temperature sensor is installed on the inner wall of the motor housing near the front end, and a third temperature sensor is installed on the inner wall of the motor housing near the rear end; the first temperature sensor, the second temperature sensor, the third temperature sensor, the semiconductor refrigeration plate and the silent fan are all controlled by a controller.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. By providing a noise reduction shell and a sound insulation interlayer inside the shell, the motor shell can be covered to reduce noise and reduce the noise generated by the rotation of the rotor from being transmitted to the outside; 2. By providing a cooling shell, in conjunction with a water pump and a cooling mechanism, the cooling shell can be kept in a low-temperature state, so that the heat on the motor shell can be absorbed by heat transfer to reduce the temperature of the motor shell. When the rotor rotates, the air flow inside the motor shell will contact the motor shell, thereby reducing the air temperature inside the motor shell, thereby absorbing the heat generated by the rotor during operation with the help of low-temperature air and reducing the temperature of the rotor. The stator is in direct contact with the inner wall of the motor shell and can directly transfer heat to the motor shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The figure is an overall schematic diagram of a direct-drive servo motor of the present invention.

[0018] Figure 2 It is a side sectional schematic diagram of a direct-drive servo motor of the present invention.

[0019] Figure 3 The figure is a schematic diagram of a heat sink of a direct-drive servo motor according to the present invention.

[0020] Icons: 1-motor housing, 2-rotor, 3-stator, 4-noise reduction housing, 5-cooling housing, 6-cooling chamber, 7-cooling water tank, 8-water pump, 9-noise reduction pipe, 10-front plate, 11-heat sink, 12-semiconductor refrigeration sheet, 13-heat sink, 14-silent cooling fan, 15-cooling sink, 16-air outlet, 17-heat conductive plate, 18-heat conductive fins, 19-threading hole, 20-sound insulation bonding layer, 21-cooling ring groove. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0022] Figures 1 to 3 An embodiment of the present invention is shown.

[0023] Embodiment 1: A direct-drive servo motor includes a motor housing 1, a rotor 2 is rotatably arranged in the motor housing 1, a stator 3 is arranged around the rotor 2 on the inner wall of the housing, a noise reduction housing 4 is arranged on the outer cover of the motor housing 1, a sound insulation interlayer is arranged in the noise reduction housing 4, a cooling housing 5 is arranged between the noise reduction housing 4 and the motor housing 1, a cooling chamber 6 is arranged in the cooling housing 5, a cooling water tank 7 is installed at the rear end of the motor housing 1, a water pump 8 is arranged in the cooling water tank 7, the water outlet of the water pump 8 is connected to the cooling chamber 6, the water inlet of the cooling water tank 7 is connected to the cooling chamber 6, and a cooling mechanism for cooling the cooling water tank 7 is installed on the surface of the cooling water tank 7. By providing the noise reduction housing 4 and the sound insulation interlayer in the housing, the motor housing 1 can be covered, thereby playing a role in noise reduction, and reducing the noise generated by the rotation of the rotor 2 from being transmitted to the outside. By providing a cooling casing 5, in conjunction with a water pump 8 and a cooling mechanism, the cooling casing 5 can be kept in a low-temperature state, so that the heat on the motor casing 1 can be absorbed by means of heat transfer, so that the temperature of the motor casing 1 is reduced. In this way, when the rotor 2 rotates, the air flow inside the motor casing 1 will contact the motor casing 1, thereby reducing the air temperature inside the motor casing 1, and the heat generated by the rotor 2 during operation can be absorbed by means of low-temperature air, thereby reducing the temperature of the rotor 2. The stator 3 directly contacts the inner wall of the motor casing 1 and can directly transfer heat to the motor casing 1.

[0024] The noise reduction housing 4 includes a noise reduction pipe 9 and a front plate 10. The noise reduction pipe 9 is fitted on the outer wall of the motor housing 1. The front plate 10 is fitted on the front end of the motor housing 1, and the edge of the front plate 10 is connected to the front end of the noise reduction pipe 9. The rear end of the noise reduction pipe 9 extends to the rear of the motor housing 1, and a heat dissipation groove 11 is formed at the rear end of the motor housing 1. By setting the front plate 10, the front side of the motor housing 1 can be noise-reduced. By setting the noise reduction pipe 9, the outer wall of the motor housing 1 can be noise-reduced. In this way, the decibel of the sound when it is propagated can be reduced from multiple directions when the motor is in use.

[0025] The cooling mechanism includes a semiconductor cooling sheet 12, a heat sink 13 and a silent cooling fan 14. The cooling water tank 7, the heat sink 13 and the silent cooling fan 14 are sequentially installed in the heat sink 11 from front to back. The cooling water tank 7 is provided with a cooling groove 15 in a concave shape on its surface. The cold end of the semiconductor cooling sheet 12 is fitted on the bottom of the cooling groove 15. The heat sink 13 is installed on the hot end of the semiconductor cooling sheet 12. The air outlet side of the silent cooling fan 14 is aligned with the heat sink 13. The surface of the noise reduction pipe 9 is provided with an air outlet 16 connected to the heat sink 11, and the air outlet 16 is aligned with the heat sink 13. In this arrangement, the water temperature in the cooling water tank 7 can be continuously reduced by fitting the cold end of the semiconductor cooling sheet 12 to the cooling groove 15, so that the water temperature in the cooling water tank 7 is kept at a low temperature. The water pump 8 sends the low-temperature water pump 8 to the cooling chamber 6, which can effectively absorb the heat of the motor housing 1. After the water that absorbs the heat and heats up returns to the cooling water tank 7, it is cooled again with the help of the semiconductor cooling sheet 12. Since the hot end of the semiconductor refrigeration sheet 12 will heat up quickly while cooling, the hot end of the semiconductor refrigeration sheet 12 is cooled by the silent cooling fan 14 and the heat sink 13, so that the semiconductor refrigeration sheet 12 can continue to work. By providing the air outlet 16, the heated hot air can be discharged from the air outlet 16.

[0026] The heat sink 13 includes a heat conducting plate 17 and a plurality of heat conducting fins 18 vertically disposed on the heat conducting plate 17. By providing the heat conducting plate 17 and the heat conducting fins 18, the heat dissipation effect of the semiconductor cooling plate 12 can be improved by increasing the heat dissipation area.

[0027] The edge of the cooling water tank 7 is sealed with the groove wall of the heat dissipation groove 11, and a cable gap is left between the cooling water tank 7 and the rear end of the motor housing 1. The outer wall of the noise reduction pipe 9 is provided with a threading hole 19 connected to the cable gap. The cooling water tank 7 is provided with a sound insulation bonding layer 20 on the side facing the motor housing 1, and the surface of the water tank is provided with a heat insulation coating. By setting the cable gap, it is convenient to connect the rotor 2, the stator 3, and the internal control elements to the external control end. By setting the heat insulation coating, the external temperature can be prevented from affecting the low-temperature water in the cooling water tank 7. By setting the sound insulation bonding layer 20, the noise in the motor housing 1 can be prevented from being transmitted from the rear end, and the noise reduction housing 4 is used to perform all-round noise reduction on the motor housing 1.

[0028] A cooling ring groove 21 is provided in the concave surface surrounding the motor housing 1, and the rear groove wall of the cooling ring groove 21 extends to communicate with the rear end of the motor housing 1. The cooling housing 5 is embedded in the cooling ring groove 21, and the outer wall of the cooling housing 5 is flush with the outer wall of the motor housing 1. By providing the cooling ring groove 21, it is easy to install the cooling housing 5. The inner wall of the cooling housing 5 and the groove bottom of the cooling ring groove 21 can be installed in a threaded manner, and the noise reduction housing 4 can be installed in the cooling ring groove 21 by screwing. The cooling housing 5 can also be fixed to the rear end of the motor housing 1 by fixing screws. When installing the cooling housing 5 and the noise reduction housing 4, the cooling housing 5 is first inserted into the cooling ring groove 21 from the rear end of the motor housing 1, and then the noise reduction housing 4 is sleeved on the outside of the motor housing 1 from the front end of the motor housing 1.

[0029] The sound insulation interlayer and the sound insulation bonding layer 20 are both made of aerogel sound insulation materials. The interior of the aerogel is full of nanopores that are open at both ends and connected to the surface. Its specific surface area of ​​up to 1000m² / g indicates that the number of pores contained is very large. Therefore, when sound propagates in it, the sound energy will be greatly consumed by the large number of pore walls, which makes the aerogel have a sound absorption effect that is dozens of times higher than that of ordinary porous materials. For example, after testing by an institution with professional qualifications, the aerogel noise reduction and sound insulation board sample developed by Huayang Group has an average sound absorption coefficient of 1.07 in the full frequency band of 100 to 5000 Hz, and the weighted sound insulation reaches 41 decibels. In addition, research reports show that the sound insulation of a certain type of aerogel with a thickness of 10mm can reach 44db, which is equivalent to the sound insulation effect of 100mm thick concrete; graphene aerogel weighing only 2.1 kilograms per cubic meter can suppress noise at 16 decibels. The noise reduction effect of aerogel will be affected by factors such as its thickness, density, and porosity. By adjusting these parameters, customized acoustic performance can be achieved for different frequency ranges to meet the sound insulation needs of specific scenarios. At the same time, aerogel also has good thermal stability, corrosion resistance, and hydrophobicity, which enables it to maintain good sound absorption performance in extremely high temperatures and harsh corrosive environments.

[0030] A first temperature sensor is installed in the cooling water tank 7, a second temperature sensor is installed on the inner wall of the motor housing 1 near the front end, and a third temperature sensor is installed on the inner wall of the motor housing 1 near the rear end; the first temperature sensor, the second temperature sensor, the third temperature sensor, the semiconductor refrigeration sheet 12 and the silent fan are all controlled by the controller. By setting the first temperature sensor, the temperature in the cooling water tank 7 can be monitored at any time, so as to control the start and shut down of the semiconductor refrigeration sheet 12, and avoid the semiconductor refrigeration sheet 12 from refrigerating for a long time, causing ice in the cooling water tank 7, which affects the use. By setting the second temperature sensor and the third temperature sensor, the temperature inside the motor housing 1 can be monitored, so as to judge whether the temperature inside the motor housing 1 is effectively cooled and maintained at a suitable working temperature, and the temperature abnormality can be monitored in time, so as to facilitate maintenance.

[0031] Although the present invention is described herein with reference to a number of illustrative embodiments of the present invention, it will be appreciated that those skilled in the art may devise many other modifications and implementations that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the present disclosure, drawings, and claims, a variety of variations and modifications may be made to the components and / or layout of the subject combination layout. In addition to the variations and modifications made to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A direct-drive servo motor, comprising a motor housing (1), a rotor (2) being rotatably disposed in the motor housing (1), and a stator (3) being disposed on an inner wall of the housing surrounding the rotor (2), wherein: The outer cover of the motor housing (1) is provided with a noise reduction housing (4), a sound insulation interlayer is provided in the noise reduction housing (4), a cooling housing (5) is provided between the noise reduction housing (4) and the motor housing (1), a cooling chamber (6) is provided in the cooling housing (5), a cooling water tank (7) is installed at the rear end of the motor housing (1), a water pump (8) is provided in the cooling water tank (7), a water outlet end of the water pump (8) is connected to the cooling chamber (6), a water inlet end of the cooling water tank (7) is connected to the cooling chamber (6), and a cooling mechanism for cooling the cooling water tank (7) is installed on the surface of the cooling water tank (7).

2. A direct drive servo motor according to claim 1, characterized in that: The noise reduction housing (4) comprises a noise reduction pipe (9) and a front plate (10); the noise reduction pipe (9) is fitted and sleeved on the outer wall of the motor housing (1); the front plate (10) is fitted and installed on the front end of the motor housing (1); the edge of the front plate (10) is connected to the front end of the noise reduction pipe (9); the rear end of the noise reduction pipe (9) extends to the rear of the motor housing (1); and a heat dissipation groove (11) is formed at the rear end of the motor housing (1).

3. A direct drive servo motor according to claim 2, characterized in that: The cooling mechanism comprises a semiconductor cooling sheet (12), a heat sink (13) and a silent cooling fan (14); the cooling water tank (7), the heat sink (13) and the silent cooling fan (14) are sequentially installed in the heat sink (11) from front to back; a cooling groove (15) is provided in a recessed manner on the surface of the cooling water tank (7); the cold end of the semiconductor cooling sheet (12) is fitted on the bottom of the cooling groove (15); the heat sink (13) is installed on the hot end of the semiconductor cooling sheet (12); the air outlet side of the silent cooling fan (14) is aligned with the heat sink (13); and the surface of the noise reduction pipe (9) is provided with an air outlet (16) connected to the heat sink (11); the air outlet (16) is aligned with the heat sink (13).

4. A direct drive servo motor according to claim 3, characterized in that: The heat dissipation plate (13) comprises a heat-conducting flat plate (17) and a plurality of heat-conducting fins (18) vertically arranged on the heat-conducting flat plate (17).

5. The direct drive servo motor according to claim 2, characterized in that: The edge of the cooling water tank (7) is sealed against the groove wall of the heat dissipation groove (11), and a cable gap is left between the cooling water tank (7) and the rear end of the motor housing (1). The outer wall of the noise reduction pipe (9) is provided with a threading hole (19) connected to the cable gap. A sound insulation bonding layer (20) is provided on the side of the cooling water tank (7) facing the motor housing (1), and a heat insulation coating is provided on the surface of the water tank.

6. A direct drive servo motor according to claim 1, characterized in that: A cooling ring groove (21) is provided in a recessed manner around the surface of the motor housing (1); a rear groove wall of the cooling ring groove (21) extends to communicate with the rear end of the motor housing (1); the cooling housing (5) is mounted in the cooling ring groove (21); and an outer wall of the cooling housing (5) is flush with an outer wall of the motor housing (1).

7. The direct drive servo motor according to claim 1, characterized in that: The sound insulation interlayer and the sound insulation bonding layer (20) are both made of aerogel sound insulation material.

8. The direct drive servo motor according to claim 1, characterized in that: A first temperature sensor is installed in the cooling water tank (7), a second temperature sensor is installed on the inner wall of the motor housing (1) near the front end, and a third temperature sensor is installed on the inner wall of the motor housing (1) near the rear end; the first temperature sensor, the second temperature sensor, the third temperature sensor, the semiconductor cooling sheet (12) and the silent fan are all controlled by a controller.

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