A servo motor

Abstract

The application discloses a kind of servo motors, including motor body and encoder, the motor body includes motor shell and the rotor of rotation installation in the motor body by motor shaft, the encoder is fixedly installed on one end of the motor shell, further include heat dissipation mechanism;The heat dissipation mechanism includes installation shell, the middle part of the installation shell has blast cabin, a plurality of blast impeller is provided in the blast cabin, the installation shell is fixedly installed on the other end of the motor shell, the motor shaft is outward from the middle part of the blast cabin, the motor shaft is transmission connection with the blast impeller to drive the blast impeller rotation;One side of the blast cabin is provided with the air outlet corresponding to the blast impeller one by one;The motor shell is provided with multiple air ducts, the air duct is through from one end to the other end of the motor shell, and the air inlet port of the air duct is communicated with the air outlet one by one.

Description

Technical Field

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

[0002] A servo motor is an engine that controls the operation of mechanical components in a servo system; it is a type of auxiliary motor with indirect speed control. Servo motors enable highly accurate speed and position control, converting voltage signals into torque and speed to drive the controlled object. The rotor speed of a servo motor is controlled by the input signal and can respond quickly. In automatic control systems, it is used as an actuator and possesses characteristics such as a small electromechanical time constant, high linearity, and low starting voltage. It can convert received electrical signals into angular displacement or angular velocity output on the motor shaft. Servo motors are broadly classified into DC and AC servo motors. Their main characteristic is that they do not rotate when the signal voltage is zero, and their speed decreases uniformly as the torque increases.

[0003] However, existing servo motors generate heat during use. When the heat becomes too high, operators have to stop the servo motor from operating and allow it to cool naturally. However, natural cooling takes a long time, which greatly reduces the working efficiency of the servo motor and has certain limitations. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides a servo motor to solve the technical problems mentioned in the background art.

[0005] A servo motor includes a motor body and an encoder. The motor body includes a motor housing and a rotor rotatably mounted within the motor body via a motor shaft. The encoder is fixedly mounted on one end of the motor housing. The motor body also includes a heat dissipation mechanism. The heat dissipation mechanism includes a mounting shell with a blower chamber in the center. Multiple blower impellers are disposed within the blower chamber. The mounting shell is fixedly mounted on the other end of the motor housing. The motor shaft extends outward from the center of the blower chamber and is drively connected to the blower impellers to drive their rotation. One side of the blower chamber has an air outlet corresponding to each blower impeller.

[0006] The motor housing is provided with multiple air ducts, which run through the motor housing from one end to the other, and the air inlet of the air duct is connected to the air outlet in a one-to-one correspondence.

[0007] Furthermore, the blower impeller is rotatably mounted inside the blower chamber via a wheel shaft, a support frame is provided inside the air outlet, and the two ends of the wheel shaft are rotatably mounted on the support frame and the mounting shell respectively via bearings;

[0008] The motor shaft drives the wheel axle to rotate through a gear set. The gear set includes a main gear, a plurality of first transmission gears meshing with the main gear, and auxiliary gears meshing with each of the first transmission gears. The main gear is sleeved on the motor shaft, the auxiliary gears are sleeved on the wheel axle, and the first transmission gears are rotatably installed inside the blower chamber.

[0009] Furthermore, the main gear is detachably connected to the motor shaft;

[0010] The main gear has a concentric connecting hole through it, and the wall of the connecting hole has a connecting groove extending through it along the axial direction. The motor shaft has a protruding key, which is inserted into the connecting groove.

[0011] Furthermore, a liquid cooling cavity is provided around the blower chamber on the mounting shell, and multiple sets of draining components are provided on the liquid cooling cavity;

[0012] The motor housing is provided with multiple coolant channels, one end of which is connected to the drain assembly and the other end is connected to the liquid cooling cavity.

[0013] The drain assembly is connected to the motor shaft, and the motor shaft drives the drain assembly to move so that the coolant circulates between the liquid cooling chamber and the coolant channel.

[0014] Furthermore, the drain assembly includes a spring, a piston disposed in the liquid cooling chamber, and a piston rod connected at one end to the piston, the other end of the piston rod sliding outward from the liquid cooling chamber into the blower chamber;

[0015] The liquid cooling chamber is provided with a liquid inlet and a liquid outlet, and each liquid inlet and liquid outlet is provided with a one-way valve. The liquid outlet port of the liquid inlet is connected to the interior of the liquid cooling chamber, and the liquid outlet port of the liquid outlet is connected to the coolant channel.

[0016] An end plate is provided on one end of the piston rod located inside the blower chamber, and the spring is sleeved on the outside of the piston rod. The spring is located between the end plate and the inner wall of the blower chamber.

[0017] The motor shaft drives the eccentric wheel to rotate via a second transmission gear. The second transmission gear is coaxially mounted with the eccentric wheel inside the blower chamber, and the outer peripheral wall of the eccentric wheel contacts the surface of the end plate.

[0018] Furthermore, the piston rod and the wall of the liquid cooling chamber are slidably sealed by a sealing ring.

[0019] Furthermore, the coolant channel is provided with four channels, each of which is arranged in a meandering manner within one side wall of the motor housing.

[0020] Furthermore, the outer wall of the liquid cooling cavity is provided with multiple heat dissipation fins.

[0021] Furthermore, the heat dissipation fins are made of pure copper.

[0022] Furthermore, the encoder's outer housing wall is provided with multiple meandering air guide holes, with both ends of the air guide holes extending through, and the air inlet of the air guide holes connected to the air outlet of the air duct.

[0023] The beneficial effects of this invention are reflected in:

[0024] When the servo motor is working, the motor shaft of the motor body will synchronously drive the blower impeller in the blower chamber of the heat dissipation mechanism to rotate, thereby blowing cooling air into the air duct of the motor housing, accelerating the air flow in the air duct, and achieving the purpose of air cooling for the motor housing; at the same time, when the motor shaft rotates, it drives the drain assembly through the eccentric wheel to make the coolant circulate between the liquid cooling chamber and the coolant channel, thereby liquid cooling the motor body.

[0025] In summary, the servo motor provided in this application can simultaneously perform air cooling and liquid cooling on the servo motor during operation, which greatly improves the heat dissipation efficiency of the servo motor. This heat dissipation method is simple and effective, and does not require stopping the operation of the servo motor, thus ensuring the working efficiency of the servo motor. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0027] Figure 1 A schematic diagram of the structure of a servo motor provided in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the motor housing provided in an embodiment of the present invention;

[0029] Figure 3 A schematic diagram of the heat dissipation mechanism provided in an embodiment of the present invention. Figure 1 ;

[0030] Figure 4 A schematic diagram of the heat dissipation mechanism provided in an embodiment of the present invention. Figure 2 ;

[0031] Figure 5 A schematic diagram of the heat dissipation mechanism provided in an embodiment of the present invention. Figure 3 ;

[0032] Figure 6 A schematic diagram of the heat dissipation mechanism provided in an embodiment of the present invention. Figure 4 ;

[0033] Figure 7 This is a schematic diagram of the connection structure between the motor shaft and the main gear provided in an embodiment of the present invention;

[0034] Figure 8 A schematic diagram of the piston mounting structure provided in an embodiment of the present invention;

[0035] Figure 9 This is a schematic diagram showing the extension of the coolant channel within the motor housing according to an embodiment of the present invention;

[0036] Figure 10 This is a schematic diagram of the extended structure of the air guide hole provided in an embodiment of the present invention. Detailed Implementation

[0037] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0038] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0039] like Figure 1 As shown, an embodiment of the present invention provides a servo motor, including a motor body 1, an encoder 2, and a heat dissipation mechanism 5. The motor body 1 includes a motor housing 3 and a rotor rotatably mounted inside the motor body 1 via a motor shaft 4. The encoder 2 is fixedly mounted on the tail end of the motor housing 3.

[0040] like Figures 3-6 As shown, the heat dissipation mechanism 5 includes a mounting housing 6, with a blower chamber 7 in the middle. Multiple blower impellers 8 are disposed within the blower chamber 7. The mounting housing 6 is bolted to the end cover of the other end of the motor housing 3. A motor shaft 4 extends outward from the middle of the blower chamber 7 and is drively connected to the blower impellers 8 to drive their rotation. One side of the blower chamber 7 has an air outlet 9 corresponding to each blower impeller 8. Figure 2 As shown, the motor housing 3 is provided with multiple air ducts 10. The air ducts 10 can be set at the four corners of the motor housing 3. The air ducts 10 run through the motor housing 3 from one end to the other. The air inlet port of the air duct 10 is connected to the air outlet 9 in a one-to-one correspondence.

[0041] When the motor shaft 4 rotates, it drives the blower impeller 8 to rotate, blowing airflow from the air outlet 9 into the air duct 10, accelerating the airflow speed within the air duct 10 of the motor housing 3, thereby speeding up heat dissipation. To increase the heat dissipation area, multiple heat dissipation ribs 31 extending axially along the air duct 10 can be provided on the inner wall of the air duct 10. In this embodiment, the motor housing 3 can be made of aluminum alloy, which has the advantages of being lightweight and having a high heat dissipation rate.

[0042] Specifically, the blower impeller 8 is rotatably mounted inside the blower chamber 7 via a shaft 11. A support frame 12 is installed inside the air outlet 9. The two ends of the shaft 11 are rotatably mounted on the support frame 12 and the mounting housing 6 respectively via bearings. The motor shaft 4 drives the shaft 11 to rotate via a gear set, which includes a main gear 13, multiple first transmission gears 32 meshing with the main gear 13, and auxiliary gears 14 meshing with each of the first transmission gears 32. The main gear 13 is mounted on the motor shaft 4, the auxiliary gears 14 are mounted on the shaft 11, and the first transmission gears 32 are rotatably mounted inside the blower chamber 7. When the motor shaft 4 rotates, the main gear 13 and the first transmission gears 32 simultaneously drive the auxiliary gears 14 to rotate, thereby driving the shaft 11 to rotate, causing the blower impeller 8 to rotate and blowing airflow into the corresponding air duct 10.

[0043] For ease of installation, disassembly, and maintenance, the main gear 13 is detachably connected to the motor shaft 4. For example... Figure 4 and Figure 7 As shown, a concentric connecting hole is provided through the main gear 13, and a connecting groove 15 extending axially through the hole wall is provided. A key 16 is provided on the motor shaft 4, and the key 16 is inserted into the connecting groove 15. The motor shaft 4 drives the main gear 13 to rotate through the key 16. Three keys 16 can be provided, evenly distributed along the outer wall of the motor shaft 4, to prevent the motor shaft 4 from vibrating due to uneven mass distribution when rotating at high speed.

[0044] Furthermore, such as Figures 3-5 As shown, a liquid cooling chamber 17 is also provided around the blower compartment 7 on the mounting housing 6, and multiple sets of draining assemblies are provided on the liquid cooling chamber 17. Multiple coolant channels 18 are provided inside the motor housing 3, one end of the coolant channel 18 is connected to the draining assembly, and the other end is connected to the liquid cooling chamber 17. The draining assembly is driven by the motor shaft 4, and the motor shaft 4 drives the draining assembly to move so that the coolant circulates between the liquid cooling chamber 17 and the coolant channels 18.

[0045] Specifically, the drain assembly includes a spring 19, a piston 21 disposed within the liquid cooling chamber 17, and a piston rod 22 connected at one end to the piston 21, such as... Figure 8As shown, the other end of the piston rod 22 slides outward from the liquid cooling chamber 17 into the air chamber 7, and the outer peripheral wall of the piston 21 is tightly fitted with the inner wall of the liquid cooling chamber 17. An end plate 26 is provided on the end of the piston rod 22 located in the air chamber 7, and a spring 19 is sleeved on the outside of the piston rod 22, with the spring 19 positioned between the end plate 26 and the inner wall of the air chamber 7.

[0046] The liquid cooling chamber 17 is equipped with an inlet 23 and an outlet 24, both of which are fitted with one-way valves 25. The outlet port of the inlet 23 is connected to the interior of the liquid cooling chamber 17, and the outlet port of the outlet 24 is connected to the coolant passage 18. The one-way valve in the inlet 23 ensures that the coolant can only flow unidirectionally from the coolant passage 18 into the liquid cooling chamber 17. The one-way valve in the outlet 24, connected to the coolant passage 18, ensures that the coolant can only flow unidirectionally from the liquid cooling chamber 17 into the coolant passage 18. The liquid cooling chamber 17 is initially filled with coolant. However, considering the thermal expansion and contraction of coolant, the coolant passage 18 cannot be completely filled at room temperature; a certain margin must be maintained. This margin must be at least equal to the volume of coolant injected by the piston 21 in a single operation.

[0047] The motor shaft 4 drives the eccentric wheel 27 to rotate via the second transmission gear 20. The second transmission gear 20 and the eccentric wheel 27 are coaxially mounted inside the blower compartment 7, and the outer peripheral wall of the eccentric wheel 27 contacts the surface of the end plate 26. When the eccentric wheel 27 rotates, with the cooperation of the spring 19, the piston rod 22 is periodically inserted into the liquid cooling chamber 17, driving the piston 21 to move back and forth within the liquid cooling chamber 17, thereby circulating the coolant between the liquid cooling chamber 17 and the coolant channel 18. To enhance the sealing of the liquid cooling chamber 17 and prevent coolant leakage, the piston rod 22 and the chamber wall of the liquid cooling chamber 17 are slidably sealed by a sealing ring 28.

[0048] The coolant passage 18 has four channels, such as... Figure 9 As shown, each coolant channel 18 is arranged in a meandering manner within one side wall of the motor housing 3 to increase the cooling area. The coolant channel 18 is sealed with the inlet 23 and outlet 24 on the liquid cooling cavity 17 by sealing rings to prevent coolant leakage.

[0049] To accelerate heat dissipation, such as Figure 5 As shown, the outer wall of the liquid cooling cavity 17 is provided with multiple heat dissipation fins 29. In this embodiment, the mounting shell 6 is made of aluminum alloy, which has the advantages of being lightweight and having a high heat dissipation rate. The heat dissipation fins 29 are made of pure copper, which has good thermal conductivity and can accelerate heat dissipation, keeping the coolant within a lower temperature range.

[0050] like Figure 10As shown, to dissipate heat from the encoder 2, multiple S-shaped, meandering air guide holes 30 are provided inside the outer casing of the encoder 2. The two ends of each air guide hole 30 extend through the encoder, and the air inlet of the air guide hole 30 is connected to the air outlet of the air duct 10. The airflow from the air duct 10 flows through the air guide holes 30 inside the outer casing of the encoder 2, thus cooling the interior of the encoder 2.

[0051] When the servo motor is working, the motor shaft of the motor body will synchronously drive the blower impeller in the blower chamber of the heat dissipation mechanism to rotate, thereby blowing cooling air into the air duct of the motor housing, accelerating the air flow in the air duct, and achieving the purpose of air cooling for the motor housing; at the same time, when the motor shaft rotates, it drives the drain assembly through the eccentric wheel to make the coolant circulate between the liquid cooling chamber and the coolant channel, thereby liquid cooling the motor body.

[0052] In summary, the servo motor provided in this application can simultaneously perform air cooling and liquid cooling on the servo motor during operation, which greatly improves the heat dissipation efficiency of the servo motor. This heat dissipation method is simple and effective, and does not require stopping the operation of the servo motor, thus ensuring the working efficiency of the servo motor.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A servo motor, comprising a motor body (1) and an encoder (2), wherein the motor body (1) comprises a motor housing (3) and a rotor rotatably mounted within the motor body (1) via a motor shaft (4), and the encoder (2) is fixedly mounted on one end of the motor housing (3), characterized in that: It also includes a heat dissipation mechanism (5); the heat dissipation mechanism (5) includes a mounting shell (6), the mounting shell (6) has a blower chamber (7) in the middle, the blower chamber (7) is provided with a plurality of blower impellers (8), the mounting shell (6) is fixedly installed on the other end of the motor housing (3), the motor shaft (4) extends outward from the middle of the blower chamber (7), the motor shaft (4) is connected to the blower impellers (8) to drive the blower impellers (8) to rotate; one side of the blower chamber (7) is provided with an air outlet (9) corresponding to the blower impellers (8); The motor housing (3) is provided with multiple air ducts (10), which run through the motor housing (3) from one end to the other. The air inlet of the air duct (10) is connected to the air outlet (9) in a one-to-one correspondence. The blower impeller (8) is rotatably mounted in the blower chamber (7) via a wheel shaft (11), and a support frame (12) is provided in the air outlet (9). The two ends of the wheel shaft (11) are rotatably mounted on the support frame (12) and the mounting shell (6) respectively via bearings. The motor shaft (4) drives the wheel axle (11) to rotate through a gear set. The gear set includes a main gear (13), a plurality of first transmission gears (32) meshing with the main gear (13), and a secondary gear (14) meshing with the first transmission gears (32) in a one-to-one correspondence. The main gear (13) is sleeved on the motor shaft (4), the secondary gear (14) is sleeved on the wheel axle (11), and the first transmission gear (32) is rotatably installed inside the blower chamber (7). A liquid cooling cavity (17) is provided around the blower chamber (7) on the mounting shell (6), and multiple sets of liquid drainage components are provided on the liquid cooling cavity (17); The motor housing (3) is provided with multiple coolant channels (18), one end of which is connected to the drain assembly and the other end is connected to the liquid cooling chamber (17); The drain assembly is connected to the motor shaft (4) for transmission. The motor shaft (4) drives the drain assembly to move so that the coolant circulates between the liquid cooling chamber (17) and the coolant channel (18). The drain assembly includes a spring (19), a piston (21) disposed in the liquid cooling chamber (17), and a piston rod (22) connected at one end to the piston (21). The other end of the piston rod (22) slides outward from the liquid cooling chamber (17) into the blower chamber (7). The liquid cooling cavity (17) is provided with an inlet (23) and an outlet (24). Both the inlet (23) and the outlet (24) are provided with a one-way valve (25). The outlet port of the inlet (23) is connected to the inside of the liquid cooling cavity (17), and the outlet port of the outlet (24) is connected to the coolant channel (18). The piston rod (22) is provided with an end plate (26) at one end inside the blower chamber (7), and the spring (19) is sleeved on the piston rod (22). The spring (19) is located between the end plate (26) and the inner wall of the blower chamber (7). The motor shaft (4) drives the eccentric wheel (27) to rotate through the second transmission gear (20). The second transmission gear (20) and the eccentric wheel (27) are coaxially arranged in the blower chamber (7). The outer peripheral wall of the eccentric wheel (27) is in contact with the surface of the end plate (26).

2. A servo motor according to claim 1, characterized in that, The main gear (13) is detachably connected to the motor shaft (4); The main gear (13) has a concentric connecting hole through it, and the connecting hole wall has a connecting groove (15) extending through it along the axial direction. The motor shaft (4) has a protruding key (16) inserted into the connecting groove (15).

3. A servo motor according to claim 1, characterized in that, The piston rod (22) and the cavity wall of the liquid cooling cavity (17) are slidably sealed by a sealing ring (28).

4. A servo motor according to claim 1, characterized in that, The coolant channel (18) is provided in four ways, and each coolant channel (18) is arranged in a meandering manner within one side wall of the motor housing (3).

5. A servo motor according to claim 1, characterized in that, The outer wall of the liquid cooling cavity (17) is provided with multiple heat dissipation fins (29).

6. A servo motor according to claim 5, characterized in that, The heat dissipation fins (29) are made of pure copper.

7. A servo motor according to claim 1, characterized in that, The encoder (2) has multiple meandering air guide holes (30) inside its outer casing wall. Both ends of the air guide holes (30) are through the air guide holes (30), and the air inlet of the air guide holes (30) is connected to the air outlet of the air duct (10).

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