Servo motor with over-temperature protection

Abstract

The utility model discloses a kind of servo motor with over-temperature protection, specifically related to servo motor technical field, including servo motor main body and overheat protection mechanism, the upper portion of the servo motor main body is equipped with overheat protection mechanism, the both sides of the servo motor main body are provided with heat dissipation component, the overheat protection mechanism includes shell, detection component and adhering base plate, the inside of the shell is equipped with detection component, the below of the detection component is equipped with adhering base. Through this design, both through active heat dissipation to reduce the risk of overheating, and in critical state through the combination mode of forced shutdown and enhanced heat dissipation, the possibility of motor damage due to high temperature is maximized, the heat dissipation efficiency and equipment safety are effectively balanced, the service life of servo motor is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of servo motor technology, and more specifically, to a servo motor with over-temperature protection. Background Technology

[0002] A servo motor is a type of motor that can precisely control position, speed, and acceleration, and is widely used in the field of automation control. For example, in CN106849011B, a method for overheat protection of a servo motor is disclosed. The servo motor is treated as a homogeneous object. When performing overheat protection, the thermal model parameters of the motor under test are first measured, and then the steady-state temperature rise Δτ∞ under the current operating condition is calculated. Next, the temperature rise change Δτ at the current moment is calculated to determine whether the overheat protection conditions are met. This method eliminates the need for additional temperature sensors, saving system costs. Traditional inverse-time current overload protection mechanisms only consider the impact of copper loss on temperature rise. The temperature rise modeling is closer to the actual thermal model, balancing model accuracy and efficiency. The modeling method is simple; data obtained through conventional loading tests can be used to determine the specific parameters of the thermal model. The established thermal model structure is easy to implement using microcontroller programming, and the overheat protection of the motor can be implemented by the servo system software. Traditional servo motor over-temperature protection relies on a single shutdown mechanism or poor linkage between the heat dissipation components and the protection mechanism: either it fails to enhance heat dissipation in time when the temperature approaches the threshold, resulting in frequent shutdowns; or it is not heat dissipated enough after shutdown, prolonging the time for the motor to resume operation.

[0003] Therefore, a servo motor with over-temperature protection is proposed to address the above problems. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a servo motor with over-temperature protection to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a servo motor with over-temperature protection, comprising a servo motor body and an over-temperature protection mechanism, wherein the over-temperature protection mechanism is installed on the top of the servo motor body, and heat dissipation components are provided on both sides of the servo motor body; the over-temperature protection mechanism includes a housing, a detection component, and a bonding base plate; the detection component is installed inside the housing, and a bonding base is installed below the detection component.

[0006] Preferably, the detection component includes a field-effect transistor box, connecting blocks, connectors, and a conveyor line. Connecting blocks are installed on both sides of the field-effect transistor box, connectors are installed on the sides of the connecting blocks, and a conveyor line is installed at the edge of the connecting blocks.

[0007] Preferably, the detection component further includes a base box, a thermistor, and contact pins. The thermistor is disposed at the edge of the base box, and two sets of contact pins are installed at the bottom of each thermistor. The field-effect transistor box and the thermistor are electrically connected through a transmission line.

[0008] Preferably, the bottom end of the housing is provided with a contact groove, and the stylus passes through the contact groove to contact the surface of the servo motor body.

[0009] Preferably, both sides of the outer casing are provided with insertion holes, both sets of insertion holes are equipped with connecting and fixing brackets, and one end of both sets of connecting and fixing brackets is equipped with a control cable.

[0010] Preferably, the servo motor body is provided with a fixed side frame on one side of the heat dissipation assembly. The heat dissipation assembly includes a heat dissipation backplate and a fan. The heat dissipation backplate is attached to the outer shell of the servo motor body, and the fan is provided on the outer diameter surface of the heat dissipation backplate.

[0011] Preferably, a cable is electrically connected to the upper side of the servo motor body, and the servo motor body and the heat dissipation assembly are connected by a fixed side plate frame and bolts to form a detachable structure.

[0012] The technical effects and advantages of this utility model are as follows: Compared with existing technologies, this servo motor with over-temperature protection uses a thermistor to capture the core temperature of the motor in real time. After converting the temperature signal into an electrical signal and processing it, it can automatically adjust the fan speed of the heat dissipation component according to the temperature, realizing active heat dissipation control and avoiding excessive temperature rise. When the temperature exceeds the threshold, it can trigger dual protection, which can immediately cut off the motor power and stop operation, while allowing the heat dissipation component to run at high power to accelerate cooling. This design reduces the risk of overheating through active heat dissipation, and in critical conditions, it minimizes the possibility of motor damage due to high temperature through a combination of forced shutdown and enhanced heat dissipation, effectively balancing heat dissipation efficiency and equipment safety, and extending the service life of the servo motor. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the overheat protection mechanism of this utility model.

[0015] Figure 3 This is a schematic diagram of the outer shell of this utility model.

[0016] Figure 4 This is a schematic diagram of the structure of the detection bracket of this utility model.

[0017] The attached figures are labeled as follows: 1. Servo motor body; 2. Overheat protection mechanism; 3. Heat dissipation component; 301. Fan; 4. Fixed side plate bracket; 5. Heat dissipation back plate; 6. Cable; 7. Housing; 8. Plug hole; 9. Detection component; 10. Fitting base plate; 11. Detection bracket; 12. Connection and fixing bracket; 13. Control conduit; 14. Contact groove; 15. Field effect transistor box; 16. Connecting block; 17. Plug connector; 18. Conveyor line; 19. Base box; 20. Thermistor; 21. Contact pin. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Example: As attached Figures 1 to 4 The servo motor shown includes a servo motor body 1 and an overheat protection mechanism 2. The overheat protection mechanism 2 is mounted on top of the servo motor body 1. Heat dissipation components 3 are provided on both sides of the servo motor body 1. The overheat protection mechanism 2 includes a housing 7, a detection component 9, and a mounting base 10. The detection component 9 is installed inside the housing 7, and a mounting base is installed below the detection component 9. During use, when the servo motor body 1 is continuously running, the heat dissipation components 3 in the overheat protection mechanism 2 capture the temperature of the servo motor body 1 dissipating heat during operation. The temperature is then monitored by a thermistor 20 in the detection component 9. Temperature is detected, and the thermistor 20 transmits the obtained signal to the inside of the field-effect transistor box 15. It is electrically connected to the connecting bracket 12 through the connector 17 on the connecting block 16, and then transmitted through the control conduit 13. The fan 301 on the heat dissipation assembly 3 is started to continuously dissipate the overall temperature of the servo motor body 1. When the temperature exceeds the threshold of the thermistor 20, the overheat protection mechanism 2 works with the controller inside the servo motor body 1 to stop the operation of the servo motor. At the same time, the heat dissipation assembly 3 operates at high power to exchange heat with the servo motor body 1, thereby adjusting the overall heat dissipation time of the servo motor body 1 and protecting the safety of the servo motor body 1.

[0020] In a preferred embodiment, the detection assembly 9 includes a field-effect transistor housing 15, connecting blocks 16, connectors 17, and a conveyor line 18. Connecting blocks 16 are installed on both sides of the field-effect transistor housing 15, and connectors 17 are installed on the sides of the connecting blocks 16. The conveyor line 18 is installed at the edge of the connecting blocks 16. The detection assembly 9 also includes a base box 19, a thermistor 20, and contact pins 21. The thermistor 20 is located at the edge of the base box 19, and two sets of contact pins 21 are installed at the bottom of the thermistor 20. The resistors 20 are electrically connected through the transmission line 18. The field-effect transistor box 15 encapsulates the operational amplifier, comparator and drive circuit. The connecting blocks 16 on both sides are fixed by screws and adopt a modular design to be compatible with different specifications of connectors 17. Thermistors 20 are evenly distributed at the edge of the bottom box 19. Two contact pins 21 are installed at the bottom of the thermistors 20. These contact pins 21 pass through the contact groove 14 opened at the bottom of the outer shell 7 and directly contact the surface of the servo motor body 1 to ensure the accuracy of temperature detection.

[0021] In a preferred embodiment, the bottom end of the housing 7 is provided with a contact groove 14, through which the contact pin 21 passes and contacts the surface of the servo motor body 1. Both sides of the housing 7 are provided with insertion holes 8, and each set of insertion holes 8 is equipped with a connecting fixing bracket 12. One end of each set of connecting fixing brackets 12 is equipped with a control cable conduit 13. The connecting fixing brackets 12 are placed in the symmetrically arranged insertion holes 8 on both sides of the housing 7, and the connecting fixing brackets 12 are fixed in the insertion holes 8 by anti-loosening nuts. The servo motor body 1 is located on one side of the heat dissipation assembly 3 and is welded with an L-shaped fixed side bracket. This bracket is connected to the heat dissipation backplate 5 of the heat dissipation assembly 3 by high-strength bolts to form a detachable structure. This structure ensures the stable fit of the heat dissipation backplate 5 and facilitates quick replacement of heat dissipation components during later maintenance.

[0022] In a preferred embodiment, the servo motor body 1 is provided with a fixed side frame on one side of the heat dissipation assembly 3. The heat dissipation assembly 3 includes a heat dissipation backplate 5 and a fan 301. The heat dissipation backplate 5 and the outer shell 7 of the servo motor body 1 are attached together. The fan 301 is provided on the outer diameter surface of the heat dissipation backplate 5. A cable 6 is electrically connected to the upper side of the servo motor body 1. The servo motor body 1 and the heat dissipation assembly 3 are connected to each other by a fixed side frame 4 and bolts to form a detachable structure.

[0023] In this embodiment, the field-effect transistor box 15 and the thermistor 20 are commercially available devices known to those skilled in the art. They can be customized or selected according to actual needs. Here, we are only using them without making any structural or functional improvements, so we will not go into detail here.

[0024] The working process of this utility model is as follows: First, the heat dissipation component 3 actively diffuses the heat generated during motor operation. The overheat protection mechanism 2 can capture these temperature field changes in real time. The thermistor 20 built into the detection component 9 continuously samples the core temperature of the servo motor body 1 through physical contact. When the temperature signal is captured by the thermistor 20, it is immediately converted into a corresponding resistance value change. This electrical signal is transmitted to the signal processing module inside the field effect transistor box 15 through the transmission line 18. After amplification and filtering, the signal is electrically connected to the connecting fixing bracket 12 through the connector 17 on the connecting block 16, and finally transmitted to the main controller through the control line 13, triggering the fan 301 on the heat dissipation component 3 to start. Employing the principle of air-cooled heat exchange, the heat dissipation backplate 5 is attached to the outer shell 7 of the servo motor body 1 by bolts, and the heat dissipation fins stamped on its surface can increase the heat dissipation area. The fan 301 is driven by a DC brushless motor, supports PWM stepless speed regulation, and can automatically adjust the speed according to the real-time temperature. When the detection component 9 detects that the temperature exceeds the preset threshold of the thermistor 20, the system will trigger a dual protection mechanism. On the one hand, the overheat protection mechanism 2 sends a stop signal to the controller in the servo motor body 1 through the control harness to immediately cut off the motor power. On the other hand, the heat dissipation component 3 will switch to high-power operation mode, and the fan 301 will run at the highest speed, forming forced convection with the heat dissipation backplate 5 to quickly dissipate the heat accumulated inside the motor, thereby shortening the cooling time of the servo motor body 1.

Claims

1. A servo motor with over-temperature protection, comprising a servo motor body (1) and an over-temperature protection mechanism (2), characterized in that: An overheat protection mechanism (2) is installed on the top of the servo motor body (1). Heat dissipation components (3) are provided on both sides of the servo motor body (1). The overheat protection mechanism (2) includes a shell (7), a detection component (9) and a bonding base plate (10). The detection component (9) is installed inside the shell (7). A bonding base is installed below the detection component (9).

2. A servo motor with over-temperature protection according to claim 1, characterized in that: The detection component (9) includes a field-effect transistor box (15), a connecting block (16), a connector (17), and a transmission line (18). The field-effect transistor box (15) has connecting blocks (16) installed on both sides, connectors (17) are installed on the sides of the connecting blocks (16), and transmission lines (18) are installed at the edges of the connecting blocks (16).

3. A servo motor with over-temperature protection according to claim 2, characterized in that: The detection component (9) also includes a base box (19), a thermistor (20) and a contact pin (21). The thermistor (20) is provided at the edge of the base box (19), and two sets of contact pins (21) are installed at the bottom end of the thermistor (20). The field effect transistor box (15) and the thermistor (20) are electrically connected through a transmission line (18).

4. A servo motor with over-temperature protection according to claim 3, characterized in that: The bottom end of the housing (7) is provided with a contact groove (14), and the stylus (21) passes through the contact groove (14) and contacts the surface of the servo motor body (1).

5. A servo motor with over-temperature protection according to claim 1, characterized in that: Both sides of the outer shell (7) are provided with plug holes (8), and both sets of plug holes (8) are equipped with connecting fixing brackets (12). One end of each set of connecting fixing brackets (12) is equipped with a control cable (13).

6. A servo motor with over-temperature protection according to claim 1, characterized in that: The servo motor body (1) is provided with a fixed side frame on one side of the heat dissipation assembly (3). The heat dissipation assembly (3) includes a heat dissipation back plate (5) and a fan (301). The heat dissipation back plate (5) and the outer shell (7) of the servo motor body (1) are attached to each other. The fan (301) is provided on the outer diameter surface of the heat dissipation back plate (5).

7. A servo motor with over-temperature protection according to claim 1, characterized in that: The servo motor body (1) is electrically connected to a cable (6) on its upper side. The servo motor body (1) and the heat dissipation assembly (3) are connected by a fixed side plate frame (4) and bolts to form a detachable structure.

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