A servo motor heat dissipation system and a method of using the same

Abstract

The application provides a servo motor heat dissipation system and a use method thereof in the field of servo motor heat dissipation. The servo motor heat dissipation system is characterized by the following: an annular heat exchange cavity filled with heat-conducting oil is installed on the inner side of the shell, so that the heat inside the motor is quickly transferred to the heat dissipation fins on the outer side of the shell; a fan wheel and a guide ring are used to make the airflow contact the heat dissipation fins efficiently, so that the heat is quickly taken away from the vicinity of the shell; the heat exchange efficiency is improved by the cooperation of the fan wheel and the guide ring; meanwhile, a temperature sensor is arranged, the annular heat exchange cavity is divided into an inner annular cavity and an outer annular cavity which are in communication at the ends, and a wheel cylinder is arranged in the annular heat exchange cavity; the temperature inside the servo motor is monitored, the wheel cylinder is started in time, the heat-conducting oil is circulated inside and outside the annular heat exchange cavity, the flow inside the heat-conducting oil is accelerated, and the heat exchange speed is accelerated; the heat-conducting oil is circulated inside and outside and up and down through the liquid suction cylinder, and the overall heat exchange speed of the heat-conducting oil is further improved.

Description

TECHNICAL FIELD

[0001] The application relates to a servo motor heat dissipation field, in particular to a servo motor heat dissipation system and a use method thereof. BACKGROUND

[0002] The servo motor can control the speed, the position accuracy is very accurate, can convert the voltage signal into torque and speed to drive the control object. The servo motor rotor speed is controlled by the input signal, and can quickly react, and is used as an execution element in an automatic control system, and has characteristics of small electromechanical time constant, high linearity, etc. The received electric signal can be converted into the angular displacement or angular velocity output on the motor shaft; the heat dissipation of the servo motor can select natural air cooling heat dissipation, forced air cooling heat dissipation, liquid circulation heat dissipation and the like.

[0003] The conventional servo motor heat dissipation system adopts a single heat dissipation mode, but various single heat dissipation modes have advantages and disadvantages, the air cooling heat dissipation system has simple structure but low heat transfer efficiency of the internal heat of the motor, and the liquid cooling heat dissipation system is easy to cause heat accumulation on the surface of the motor shell.

[0004] The application provides a servo motor heat dissipation system and a use method thereof, which adopts an air cooling and liquid cooling combined mode to form a heat dissipation system. SUMMARY

[0005] The application aims to solve the shortcomings of the conventional servo motor single heat dissipation system mode, and provides a servo motor heat dissipation system and a use method thereof, which can realize liquid cooling to improve the efficiency of the internal heat transfer to the outside and air cooling to quickly take away the heat near the motor shell.

[0006] A servo motor heat dissipation system, comprising a shell, a stator is installed in the shell, and a rotor is rotationally connected to the inner side of the stator; an annular heat exchange cavity is arranged on the inner wall of the shell and abuts against the outer wall of the stator and is filled with heat-conducting oil inside, a plurality of heat dissipation fins are fixedly connected to the outer wall of the shell and are circumferentially distributed and extend into the annular heat exchange cavity, and a flow guide ring is arranged on the left side of the heat dissipation fins and is fixedly connected to the outer wall of the shell; a partition plate is fixedly connected to the inside of the shell on the left side of the stator, a fan impeller is arranged on the left side of the partition plate and is fixedly sleeved with the rotor, an air inlet hole is arranged on the outer wall of the shell on the left side of the flow guide ring, and an air outlet hole is arranged on the outer wall of the shell on the right side of the flow guide ring and is communicated with the inner cavity of the flow guide ring.

[0007] The annular heat exchange cavity is nested with a split ring which separates the annular heat exchange cavity into an inner annular cavity and an outer annular cavity, the left end of the split ring is provided with a flow-through groove which communicates the inner annular cavity and the outer annular cavity, and the right side of the split ring is provided with a flow-through hole which communicates the inner annular cavity and the outer annular cavity; the inner annular cavity is nested with an impeller cylinder, the right end of the impeller cylinder is sleeved with a gear ring, the gear ring is engaged with a driving gear, the driving gear is fixedly connected with a first transmission shaft which extends to the outside of the annular heat exchange cavity, the first transmission shaft is connected with an output shaft of an electromagnetic clutch through a first transmission gear set, the input shaft of the electromagnetic clutch is connected with a second transmission shaft, and the second transmission shaft is connected in transmission with the rotor through a second transmission gear set;

[0008] The stator is provided with a temperature sensor, and the temperature sensor is electrically connected with an external servo controller through a wire.

[0009] Further, the servo motor heat dissipation system further comprises a circulating mechanism, the circulating mechanism comprises a liquid pumping cylinder which is installed below the shell, the liquid pumping cylinder is communicated with the lower cavity of the annular heat exchange cavity through a liquid pumping pipe, and the liquid pumping cylinder is communicated with the upper cavity of the annular heat exchange cavity through a liquid injection pipe; the liquid pumping cylinder is nested with a piston, the piston extends to the outside of the liquid pumping cylinder and is fixedly connected with a clamping frame, the clamping frame is clamped with an eccentric groove disc, the eccentric groove disc is fixedly connected with a vertical shaft which extends into the shell, and the vertical shaft is connected in transmission with the first transmission shaft through a third transmission gear set.

[0010] Preferably, the heat dissipation fins are S-shaped heat dissipation fins, the heat dissipation fins extend into the outer annular cavity and abut against the outer end surface of the split ring, and the heat dissipation fins divide the outer annular cavity into a plurality of groups of S-shaped flow-through channels which are distributed in a circumferential direction.

[0011] Preferably, the cross section of the flow guide ring is in a horizontal L shape, and the flow guide ring is fixedly welded to the outer wall of the shell.

[0012] Preferably, the right end of the split ring is fixedly connected with the inner wall of the annular heat exchange cavity, the inner side of the split ring is provided with a baffle which is integrally formed with the split ring and which abuts against and slides with the impeller cylinder, and the gear ring and the driving gear are both installed on the right side of the baffle.

[0013] Preferably, the impeller cylinder is a cylinder which has openings at both ends and is fixedly connected with blades which are distributed at equal intervals at the left end.

[0014] Preferably, the flow-through hole is arranged between the blade and the baffle, and the split ring is provided with flow-through holes which are distributed at equal intervals in a circumferential direction; and the flow-through groove is an annular gap between the split ring and the left inner wall of the annular heat exchange cavity.

[0015] Preferably, a first one-way valve which prevents the heat conducting oil from flowing back from the liquid pumping pipe to the annular heat exchange cavity is arranged at the position where the liquid pumping pipe communicates with the annular heat exchange cavity, and a second one-way valve which prevents the heat conducting oil from flowing back from the annular heat exchange cavity to the liquid injection pipe is arranged at the position where the liquid injection pipe communicates with the annular heat exchange cavity.

[0016] Preferably, the suction cylinder is a horizontal cylinder and has a partition plate inside for separating the cylinder into two independent cavities, the suction pipe and the injection pipe are both communicated with the left cavity, and the piston is nested in the left cavity.

[0017] A method for using a servo motor heat dissipation system, comprising the following steps: step one, turn on the power supply of the servo motor, start the servo motor and the temperature sensor through the servo controller, and cooperate the air cooling and liquid cooling for heat dissipation; step two, the temperature sensor monitors the temperature inside the servo motor in real time and returns the temperature to the servo controller; step three, the servo controller compares the returned temperature data with the set threshold value, and when the returned temperature data is greater than the threshold value, the electromagnetic clutch is started to make the heat conducting oil circulate inside and outside the annular heat exchange cavity; at the same time, the suction cylinder makes the heat conducting oil circulate up and down.

[0018] Compared with the prior art, the advantages of the present application are that:

[0019] (1) The annular heat exchange cavity filled with heat conducting oil is installed in the inner side of the shell, which quickly transmits the heat inside the motor to the heat dissipation fins on the outer side of the shell, and the fan impeller and the guide ring are used to make the airflow contact the heat dissipation fins efficiently for heat exchange, so as to quickly take the heat away from the shell, and the cooperation of the two improves the heat exchange efficiency; at the same time, the temperature sensor, the annular heat exchange cavity divided into an inner annular cavity and an outer annular cavity in communication with the end part, and the impeller cylinder arranged in the annular heat exchange cavity are provided, the temperature inside the servo motor is monitored, the impeller cylinder is started in time, the heat conducting oil circulates inside and outside the annular heat exchange cavity, the flow inside the heat conducting oil is accelerated, and the heat exchange efficiency is accelerated.

[0020] (2) The heat dissipation fins extending from the annular heat exchange cavity to the outer side of the shell in an S shape are provided, which improves the area of the heat dissipation fins in contact with the external airflow under the condition of horizontal length, and the S-shaped heat dissipation fins divide the outer annular cavity into a plurality of S-shaped channels for the flow of heat conducting oil in circumferential distribution, which improves the contact area of the heat conducting oil and the heat dissipation fins, and further improves the heat transfer effect of the heat dissipation fins.

[0021] (3) The suction cylinder installed at the lower part of the shell and in communication with the upper part and the lower part of the annular heat exchange cavity is provided, which realizes the up-and-down circulation of the heat conducting oil in the annular heat exchange cavity, so that the heat conducting oil not only circulates inside and outside but also circulates up and down, and the overall heat exchange efficiency of the heat conducting oil is further improved.

[0022] (4) The method for using the servo motor heat dissipation system disclosed by the present application monitors the temperature inside the motor in real time through the temperature sensor, uses the heat conducting oil and the airflow for cooperation heat dissipation when the heat output is low, forces the heat conducting oil to circulate inside and outside and up and down when the heat output is high, and automatically adjusts the heat dissipation mode according to the heat production state. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a schematic view of the perspective structure of the present application;

[0024] Figure 2 is a schematic view of the sectional structure of the present application;

[0025] Figure 3 is a schematic view of the perspective structure of the present application; Figure 2 is a schematic view of the enlarged structure at A in the present application;

[0026] Figure 4 is a schematic view of the sectional structure of the housing in the present application;

[0027] Figure 5 is a schematic view of the perspective structure of the heat dissipation fin in the present application;

[0028] Figure 6 is a schematic view of the perspective structure of the flow guide ring in the present application;

[0029] Figure 7 is a schematic view of the perspective structure of the flow guide ring in the present application; Figure 2 is a schematic view of the enlarged structure at B in the present application;

[0030] Figure 8 is a schematic view of the perspective structure of the split ring in the present application;

[0031] Figure 9 is a schematic view of the perspective structure of the impeller cylinder in the present application;

[0032] Figure 10 is a schematic view of the longitudinal sectional structure of the present application.

[0033] Explanation of reference numerals in the drawing: 1, housing; 101, annular heat exchange cavity; 102, air inlet hole; 103, air outlet hole; 2, rotor; 3, stator; 4, heat dissipation fin; 5, partition plate; 6, fan impeller; 7, flow guide ring; 8, split ring; 801, baffle; 802, flow-through hole; 803, flow-through groove; 9, impeller cylinder; 901, blade; 10, gear ring; 11, drive gear; 12, first transmission shaft; 13, first transmission gear set; 14, electromagnetic clutch; 15, second transmission shaft; 16, second transmission gear set; 17, liquid pumping cylinder; 18, liquid pumping pipe; 19, liquid injection pipe; 20, piston; 21, clamping frame; 22, eccentric groove disc; 23, vertical shaft; 24, third transmission gear set; 25, temperature sensor; 26, servo controller. DETAILED DESCRIPTION

[0034] The embodiments will be described in conjunction with the drawings in the specification, and all other embodiments obtained by those skilled in the art based on the embodiments in the present application without creative labor shall fall within the scope of protection of the present application.

[0035] Example 1:

[0036] The application provides a servo motor heat dissipation system, which comprises a shell 1, a stator 3 is arranged in the shell 1, and a rotor 2 is rotationally connected to the inner side of the stator 3. Figures 1-7 An annular heat exchange cavity 101 filled with heat-conducting oil is arranged on the inner wall of the shell 1 and abuts against the outer wall of the stator 3, heat dissipation fins 4 are fixedly connected to the outer wall of the shell 1 and extend into the annular heat exchange cavity 101 in a circumferential distribution, and a flow guide ring 7 is arranged on the left side of the heat dissipation fins 4 and fixedly connected to the outer wall of the shell 1.

[0037] A partition ring 8 is arranged in the annular heat exchange cavity 101 and separates the annular heat exchange cavity 101 into an inner annular cavity and an outer annular cavity, a flow-through groove 803 is arranged at the left end of the partition ring 8 and communicates the inner annular cavity and the outer annular cavity, and a flow-through hole 802 is arranged at the right side of the partition ring 8 and communicates the inner annular cavity and the outer annular cavity.

[0038] A temperature sensor 25 is arranged in the stator 3 and electrically connected to an external servo controller 26 through wires.

[0039] Specifically, the heat-conducting oil in the annular heat exchange cavity 101 absorbs the heat in the shell 1, and the heat of the heat-conducting oil is transferred to the heat dissipation fins 4 for heat dissipation.

[0040] Meanwhile, the temperature of the stator 3 and the rotor 2 is detected by the temperature sensor 25, and the temperature information is fed back to the servo controller 26. When the temperature exceeds the set threshold, the electromagnetic clutch 14 is started, the rotor 2 drives the second transmission shaft 15 to rotate through the second transmission gear set 16, the second transmission shaft 15 drives the first transmission shaft 12 to rotate through the electromagnetic clutch 14 and the first transmission gear set 13, and the first transmission shaft 12 drives the impeller cylinder 9 to rotate through the drive gear 11. The impeller cylinder 9 pushes the heat conducting oil to circulate in the inner annular cavity and the outer annular cavity, accelerates the contact speed of the heat conducting oil with the heat dissipation fins 4, improves the heat exchange effect, and speeds up the heat dissipation speed of the stator 3 and the rotor 2.

[0041] In the embodiment, the heat dissipation fins 4 are S-shaped heat dissipation fins, the heat dissipation fins 4 extend into the outer annular cavity and abut against the outer end surface of the partition ring 8, and the heat dissipation fins 4 divide the outer annular cavity into a plurality of groups of S-shaped flow channels distributed in a circle.

[0042] Specifically, the heat conducting oil has a larger contact area and a longer contact time with the heat dissipation fins 4 when flowing in the outer annular cavity, so that the heat conducting oil and the heat dissipation fins 4 are more fully heat exchanged, the heat dissipation fins 4 outside the shell 1 have a larger contact area with air, and the heat dissipation speed is improved.

[0043] In the embodiment, the cross section of the flow guide ring 7 is in the shape of a horizontal L, and the flow guide ring 7 is welded and fixed to the outer wall of the shell 1.

[0044] Specifically, the airflow entering the flow guide ring 7 becomes a horizontal airflow under the action of the inner cavity of the flow guide ring 7, which facilitates uniform contact of the airflow with the circumferentially distributed heat dissipation fins 4 and improves the heat exchange effect of the airflow with the heat dissipation fins 4.

[0045] In the embodiment, the right end of the partition ring 8 is fixedly connected to the inner wall of the annular heat exchange cavity 101, the inner side of the partition ring 8 is provided with a baffle 801 integrally formed therewith and abutting and sliding against the impeller cylinder 9, and the gear ring 10 and the drive gear 11 are both installed on the right side of the baffle 801.

[0046] Specifically, the heat conducting oil is prevented from contacting the gear ring 10 and the drive gear 11.

[0047] In the embodiment, the impeller cylinder 9 is a cylinder with openings at both ends, and the left end of the impeller cylinder 9 is fixedly connected with blades 901 distributed at equal intervals.

[0048] Specifically, when the impeller cylinder 9 rotates, the blades 901 drive the heat conducting oil to circulate between the inner annular cavity and the outer annular cavity.

[0049] In the embodiment, the flow-through holes 802 are arranged between the vane 901 and the baffle 801, and the flow-through holes 802 are circumferentially and equidistantly arranged on the split ring 8; the flow-through groove 803 is an annular gap formed between the split ring 8 and the inner wall on the left side of the annular heat exchange cavity 101.

[0050] Specifically, the heat-conducting oil is driven by the vane 901 to circulate between the inner annular cavity and the outer annular cavity.

[0051] Embodiment 2:

[0052] The application provides a servo motor heat dissipation system, please refer to Figure 2 and Figures 7-10 The difference between the embodiment and the embodiment 1 is that the servo motor heat dissipation system further comprises a circulating mechanism, the circulating mechanism comprises a liquid pumping cylinder 17 installed below the shell 1, the liquid pumping cylinder 17 is in communication with a lower cavity of the annular heat exchange cavity 101 through a liquid pumping pipe 18, and the liquid pumping cylinder 17 is in communication with an upper cavity of the annular heat exchange cavity 101 through a liquid injection pipe 19; the liquid pumping cylinder 17 is nested with a piston 20, the piston 20 extends to the outside of the liquid pumping cylinder 17 and is fixedly connected with a clamping frame 21, the clamping frame 21 is clamped with an eccentric groove disc 22, the eccentric groove disc 22 is fixedly connected with a vertical shaft 23 extending into the shell 1, and the vertical shaft 23 is connected and driven with the first transmission shaft 12 through a third transmission gear set 24.

[0053] Specifically, while the heat-conducting liquid circulates in the inner annular cavity and the outer annular cavity, the liquid pumping cylinder 17 intermittently pumps the heat-conducting oil in the lower part of the annular heat exchange cavity 101 to the upper part of the annular heat exchange cavity 101, so that the heat-conducting oil in the annular heat exchange cavity 101 not only circulates in the inner annular cavity and the outer annular cavity but also realizes intermittent up-down circulation of the heat-conducting oil, thereby improving the circulation effect of the heat-conducting oil, making the heat distribution more uniform, and improving the overall heat absorption effect of the heat-conducting oil.

[0054] In the embodiment, a first one-way valve is arranged at the position where the liquid pumping pipe 18 communicates with the annular heat exchange cavity 101, to avoid backflow of the heat-conducting oil from the liquid pumping pipe 18 to the annular heat exchange cavity 101; and a second one-way valve is arranged at the position where the liquid injection pipe 19 communicates with the annular heat exchange cavity 101, to avoid backflow of the heat-conducting oil from the annular heat exchange cavity 101 to the liquid injection pipe 19.

[0055] Specifically, the one-way flow of the heat-conducting oil from the lower part to the upper part is ensured.

[0056] In the embodiment, the liquid pumping cylinder 17 is a horizontal cylinder and is internally provided with a split plate for separating the liquid pumping cylinder 17 into two independent cavities, the liquid pumping pipe 18 and the liquid injection pipe 19 are both in communication with the left cavity, and the piston 20 is nested in the left cavity.

[0057] Specifically, the clamping frame 21 and the eccentric groove disc 22 are conveniently installed.

[0058] The use method of the servo motor heat dissipation system comprises the following steps: step one, turn on the power supply of the servo motor, start the servo motor and the temperature sensor 25 through the servo controller 26, and cooperate the air cooling and the liquid cooling for heat dissipation; step two, the temperature sensor 25 monitors the temperature inside the servo motor in real time and returns the temperature to the servo controller 26; step three, the servo controller 26 compares the returned temperature data with the set threshold value, and when the returned temperature data is greater than the threshold value, the electromagnetic clutch 14 is started to make the heat-conducting oil circulate inside and outside the annular heat exchange cavity 101; at the same time, the liquid pumping cylinder 17 makes the heat-conducting oil circulate up and down.

[0059] Specifically, the heat output of the servo motor is detected by the temperature sensor 25, and when it exceeds the predetermined threshold value, the heat-conducting oil circulates inside and outside and up and down, so that the air cooling and the liquid cooling cooperate better for heat dissipation.

[0060] The above describes only the preferred specific embodiments of the present application; however, the protection scope of the present application is not limited thereto.

Claims

1. A heat dissipation system for a servo motor, characterized by, The utility model provides a servo motor heat dissipation system, including shell (1), the inside rotation is connected with rotor (2) of stator (3) of installation of shell (1) inside, the inside wall of shell (1) is equipped with annular heat exchange cavity (101) with stator (3) outer wall abuts and internally fills the heat conducting oil, and the outer wall of shell (1) is fixedly connected with the heat dissipation fin (4) that presents the circularly distributed and extends to annular heat exchange cavity (101) inside, and the left side portion of heat dissipation fin (4) is equipped with the flow guide ring (7) with the fixed connection of shell (1) outer wall, the inside fixed connection of shell (1) is equipped with the baffle (5) in the left side of stator (3), and the left side of baffle (5) is equipped with the fan impeller (6) with the sleeve joint of rotor (2), and the outer wall of shell (1) is located in the left side of flow guide ring (7) and is equipped with the air inlet hole (102), and the outer wall of shell (1) is located in the right side of flow guide ring (7) and is equipped with the air outlet hole (103) with the inner chamber communication of flow guide ring (7), The annular heat exchange cavity (101) is nested with the split ring (8) that is divided into inner annular cavity and outer annular cavity, the left end of split ring (8) is provided with flow channel (803) that communicates inner annular cavity and outer annular cavity, and the right side of split ring (8) is provided with flow-through hole (802) that communicates inner annular cavity and outer annular cavity, the inner annular cavity is nested with impeller cylinder (9), the right end of impeller cylinder (9) is sleeved with gear ring (10), gear ring (10) is engaged with driving gear (11), driving gear (11) is fixedly connected with first transmission shaft (12) that extends to the outside of annular heat exchange cavity (101), first transmission shaft (12) is connected with the output shaft of electromagnetic clutch (14) through first transmission gear set (13), the input shaft of electromagnetic clutch (14) is connected with second transmission shaft (15), and second transmission shaft (15) is connected with rotor (2) through second transmission gear set (16) and drives, The stator (3) is provided with a temperature sensor (25), and the temperature sensor (25) is electrically connected with an external servo controller (26) through a wire.

2. The heat dissipation system of a servo motor according to claim 1, wherein, The servo motor heat dissipation system further comprises a circulating mechanism, the circulating mechanism comprises a liquid pumping cylinder (17) mounted below the shell (1), the liquid pumping cylinder (17) is in communication with the lower cavity of the annular heat exchange cavity (101) through a liquid pumping pipe (18), and the liquid pumping cylinder (17) is in communication with the upper cavity of the annular heat exchange cavity (101) through a liquid injection pipe (19); the liquid pumping cylinder (17) is nested with a piston (20), the piston (20) extends to the outside of the liquid pumping cylinder (17) and is fixedly connected with a clamping frame (21), the clamping frame (21) is clamped with an eccentric groove disc (22), the eccentric groove disc (22) is fixedly connected with a vertical shaft (23) extending into the shell (1), and the vertical shaft (23) is connected with the first transmission shaft (12) through a third transmission gear set (24) and drives.

3. The heat dissipation system of a servo motor according to claim 1, wherein, The heat dissipation fin (4) is an S-shaped heat dissipation fin, the heat dissipation fin (4) extends into the outer annular cavity and abuts against the outer end surface of the split ring (8), and the heat dissipation fin (4) divides the outer annular cavity into a plurality of groups of S-shaped flow-through channels distributed in a circle.

4. The heat dissipation system of a servo motor according to claim 1, wherein, The cross section of the flow guide ring (7) is in the shape of an L, and the flow guide ring (7) is welded and fixed to the outer wall of the shell (1).

5. The heat dissipation system of a servo motor according to claim 1, wherein, The right end of the split ring (8) is fixedly connected with the inner wall of the annular heat exchange cavity (101), the inner side of the split ring (8) is provided with a baffle (801) integrally formed with the split ring (8) and abutting and sliding with the impeller cylinder (9), and the gear ring (10) and the driving gear (11) are both installed on the right side of the baffle (801).

6. The heat dissipation system of a servo motor according to claim 5, wherein, The impeller cylinder (9) is a cylinder with openings at both ends, and the left end is fixedly connected with equally distributed blades (901).

7. The heat dissipation system of a servo motor according to claim 6, wherein, The flow-through hole (802) is arranged between the blade (901) and the baffle (801), and the split ring (8) is provided with circumferentially equally distributed flow-through holes (802); the flow-through groove (803) is an annular gap formed between the split ring (8) and the left inner wall of the annular heat exchange cavity (101).

8. The heat dissipation system of a servo motor according to claim 2, wherein, The liquid suction pipe (18) is provided with a first one-way valve at the communication part with the annular heat exchange cavity (101) to avoid the backflow of the heat conducting oil from the liquid suction pipe (18) to the annular heat exchange cavity (101), and the liquid injection pipe (19) is provided with a second one-way valve at the communication part with the annular heat exchange cavity (101) to avoid the backflow of the heat conducting oil from the annular heat exchange cavity (101) to the liquid injection pipe (19).

9. The heat dissipation system of a servo motor according to claim 2, wherein, The liquid suction cylinder (17) is a horizontal cylinder and is provided with a split plate inside to divide it into two independent cavities, the liquid suction pipe (18) and the liquid injection pipe (19) are both communicated with the left cavity, and the piston (20) is nested in the left cavity.

10. The method of using a heat dissipation system for a servo motor of claim 2, wherein, The method comprises the following steps: step one, turn on the power supply of the servo motor, start the servo motor and the temperature sensor (25) through the servo controller (26), and cooperate the air cooling and the liquid cooling for heat dissipation; step two, the temperature sensor (25) monitors the temperature inside the servo motor in real time and returns the temperature to the servo controller (26); step three, the servo controller (26) compares the returned temperature data with the set threshold value, when the returned temperature data is greater than the threshold value, the electromagnetic clutch (14) is started, so that the heat conducting oil circulates inside and outside in the annular heat exchange cavity (101); at the same time, the liquid suction cylinder (17) makes the heat conducting oil circulate up and down.

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