Motor front shaft heat dissipation device
By installing air guides and temperature sensors on the motor cooling shroud, and combining this with a controller to adjust the valves and cooling fan speed, the problems of inadequate heat dissipation of the motor's front bearing and lack of intelligent monitoring were solved, achieving efficient and stable motor operation.
Patent Information
- Application Number
- CN202520534181.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-25
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2035-03-25
AI Technical Summary
Heat tends to accumulate at the front bearing of existing motors, causing the temperature to be higher than that of the rear bearing. Traditional heat dissipation methods are not ideal and lack intelligent temperature monitoring and control, which affects the stability and reliability of motor operation.
Air guides and temperature sensors are installed on the motor's heat dissipation shroud. The controller adjusts the valves and cooling fan speed to achieve targeted heat dissipation of the front bearing and adjusts the airflow according to the real-time temperature.
It improves the heat dissipation efficiency of the motor's front bearing, maintains a suitable operating temperature range, extends the motor's service life, and enhances operational stability and reliability.
Smart Images
Figure CN223942548U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of motor heat dissipation technology, specifically relating to a heat dissipation device for the front shaft of a motor. Background Technology
[0002] Electric motors are used in many industrial environments. During operation, the front and rear bearings of these motors easily overheat, affecting their lifespan. Due to the motor's structure, only the rear bearing has a fan; the front bearing is typically opposite the equipment it drives and cannot have a fan. Traditionally, motor cooling relies on a fan at the rear bearing to blow airflow from the rear end along the gaps between the heat sink fins on the motor housing to the front end. The airflow carries away most of the heat as it passes over the fins. However, the airflow can only pass through the outer perimeter of the motor housing and cannot reach the front bearing for effective cooling. Therefore, heat easily accumulates at the front bearing, causing it to be hotter than the rear bearing, leading to overheating and damage.
[0003] Currently, while some cooling methods and technologies have been adopted for motor front shaft heat dissipation, some shortcomings still exist. For example, existing technologies symmetrically install two air intake plates on both sides of the motor cooling shroud, aiming to guide the airflow generated by the cooling fan along the air intake plates to the motor front shaft. However, because the airflow passes through the heat sink during its journey from the cooling fan to the motor front shaft, it has already exchanged heat with the heat sink, resulting in an increased airflow temperature by the time it reaches the motor front shaft, thus leading to unsatisfactory heat dissipation. Furthermore, some cooling devices lack intelligent temperature monitoring and control mechanisms, failing to make precise heat dissipation adjustments based on the real-time temperature of the motor front shaft, affecting the motor's operational stability and reliability. Utility Model Content
[0004] To address the above problems, the purpose of this utility model is to provide a heat dissipation device for the front shaft of a motor, thereby solving the problems mentioned in the background art.
[0005] This utility model provides a front shaft heat dissipation device for an electric motor, including an air guide installed on the heat dissipation shroud of the motor and used to guide the airflow generated by the cooling fan to the front shaft. The air guide is a tube that communicates with the heat dissipation shroud and has an airflow cavity inside. A valve is installed at the air inlet of the air guide. A temperature sensor for monitoring the temperature of the front shaft is installed on the front end cover of the motor. A controller connected to the temperature sensor is installed on the outside of the heat dissipation shroud. The controller controls the opening degree of the valve according to the temperature signal monitored by the temperature sensor.
[0006] Preferably, the controller controls the speed of the cooling fan based on the temperature signal monitored by the temperature sensor. When the temperature exceeds a preset threshold, the controller increases the fan speed to increase the airflow; when the temperature is below the preset threshold, the controller reduces the fan speed.
[0007] Preferably, the air guide is located at the bottom of the motor, and the air outlet of the air guide faces the front shaft of the motor.
[0008] Preferably, the front end cover of the motor is fixedly connected to an outer shell that forms an air-gathering chamber with the front end cover, the top of the outer shell is provided with a heat dissipation vent, and the end of the air guide that is away from the heat dissipation shroud is connected to the air-gathering chamber.
[0009] Preferably, it also includes a seal installed between the motor's heat sink and the air guide.
[0010] Preferably, the temperature sensor is an infrared sensor or a resistance temperature detector (RTD) sensor.
[0011] The beneficial effects of this utility model are as follows: By setting an air guide at the bottom of the motor, which is a tube connected to the heat dissipation shroud and has an airflow cavity, it is separated from the airflow path for heat dissipation of the motor housing. This effectively directs the airflow generated by the cooling fan to the front shaft of the motor, achieving targeted heat dissipation and improving heat dissipation efficiency. At the same time, a temperature sensor, controller, and valve are set up. The controller can control the valve opening and the speed of the cooling fan according to the temperature signal, so as to flexibly adjust the airflow entering the front shaft according to the actual temperature of the front shaft, avoiding excessive or insufficient heat dissipation, which helps to maintain the front shaft of the motor within a suitable operating temperature range and extend the service life of the motor. Attached Figure Description
[0012] Figure 1 This is a first-view perspective three-dimensional structural diagram of the present invention;
[0013] Figure 2 This is a second-view three-dimensional structural diagram of the present invention;
[0014] Figure 3 This is a cross-sectional structural diagram of the present invention;
[0015] Figure 4 This is a schematic diagram of the third-view three-dimensional structure of the present invention;
[0016] Figure 5 This is a schematic diagram of the circuit structure of this utility model.
[0017] In the diagram: 1. Motor; 2. Heat sink shroud; 3. Cooling fan; 4. Front shaft; 5. Airflow chamber; 6. Valve; 7. Front cover; 8. Temperature sensor; 9. Controller; 10. Air collection chamber; 11. Housing; 12. Heat dissipation vent; 13. Infrared sensor; 14. Resistance temperature detector (RTD) sensor; 15. Filter screen; 16. Air duct structure; 17. Heat sink; 18. Winding; 19. Iron core; 20. Air guide. Detailed Implementation
[0018] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of this utility model in any way.
[0019] The existing motor front shaft cooling device of this utility model mainly includes air guide components 20, which are generally two air guide plates symmetrically installed on both sides of the motor 1 heat dissipation shroud 2. The length of the air guide plates is approximately the same as that of the front shaft 4 from the heat dissipation shroud 2 to the front shaft 4. They form an air guide channel with the side wall of the motor 1 to guide the airflow generated by the cooling fan 3 to the front shaft 4 for cooling and heat dissipation. In order to prevent dust from being sucked into the motor 1 through the cooling fan 3, a filter screen 15 is also installed at the rear end cover of the motor 1 to filter impurities in the airflow. Specifically, when the cooling fan 3 is running, a negative pressure is generated inside the heat dissipation shroud 2, which causes the external airflow to pass through the filter screen 15 and enter the heat dissipation shroud 2. After passing through the air duct structure 16 of the heat dissipation shroud 2, it is blown towards the heat sink 17 on the outside of the motor 1 body. At the same time, some airflow will also pass through the air guide channel to guide the front shaft 4 for heat dissipation. The above is an introduction to the existing motor front shaft cooling device.
[0020] In summary, the existing technology has the following problems. Problem 1 is that components such as the windings 18 (such as the windings on the stator and rotor) and the iron core 19 inside the motor 1 generate heat under the influence of current and magnetic field, causing the temperature of the motor 1 to rise. At the same time, the front shaft 4 of the motor 1, as a component that carries and connects the equipment driven by the motor 1, also generates heat. In addition, during the operation of the motor 1, due to friction between components and air resistance, some energy is converted into mechanical losses, which in turn are converted into heat. The heat generated by the windings 18 of the motor 1 is transferred to the heat sink 17 of the motor 1 housing. The airflow generated by the cooling fan 3 installed at the rear end of the motor 1 passes through the heat sink 17 and carries away most of the heat, thus achieving heat dissipation. However, the airflow can only pass through the outer periphery of the motor 1 housing and cannot reach the front shaft 4 of the motor 1 to achieve effective heat dissipation. Therefore, heat easily accumulates at the front shaft 4 of the motor 1, causing the temperature of the front shaft 4 to be higher than that of the rear bearing, resulting in overheating and damage to the front shaft 4 of the motor 1. To solve this problem, the prior art has two guide plates symmetrically installed on both sides of the heat dissipation shroud 2, which are intended to guide the airflow generated by the cooling fan 3 along the guide plates to the front shaft 4 of the motor 1. However, since the airflow passes through the heat sink 17 during the process of guiding the airflow from the cooling fan 3 to the front shaft 4 of the motor 1, it has already exchanged heat with the heat sink 17. When it reaches the front shaft 4 of the motor 1, the temperature of the airflow has already increased, resulting in an unsatisfactory heat dissipation effect. Based on the above problems, the present invention adopts the following improvement method to solve the problem.
[0021] like Figure 1-4As shown, a front shaft cooling device for an electric motor includes an air guide 20 installed on the cooling shroud 2 of the motor 1. The air guide 20 is a tube with an internal airflow chamber 5, which is connected to the cooling shroud 2. The end of the air guide 20 furthest from the cooling fan 3 is located at the front shaft 4, diverting the airflow generated by the cooling fan 3 to the front shaft 4, separating it from the airflow directed to the heat sink 17 of the motor 1. This solves the problem of ineffective heat dissipation of the front shaft 4 in existing technologies. Since the heat of the motor 1 is mainly concentrated around its internal heat-generating components, such as the windings 18 and the core, which are typically located in the upper middle part of the motor 1, the heat sink 17 is also positioned accordingly to dissipate heat more effectively. The bottom, being far from the main heat-generating components, has relatively lower heat dissipation requirements; therefore, the air guide 20 is installed at the bottom of the motor 1. A housing 11, forming an air-gathering chamber 10 with the front cover 7, is also fixedly connected to the front cover 7 of the motor 1. The top of the outer casing 11 has a heat dissipation vent 12. The end of the air guide 20 away from the heat dissipation shroud 2 passes through the base of the motor 1 and communicates with the air concentrator 10. This can further increase the distance between the air guide 20 and the heat sink 17, and prevent the airflow from the air guide 20 from being affected by the temperature of the heat sink 17, thus affecting the cooling effect of the front shaft 4. When the airflow enters the relatively sealed air concentrator 10 along the air guide 20, it can flow more concentratedly to the front shaft 4 of the motor 1, avoiding airflow dispersion. Finally, it flows out along the heat dissipation vent 12 and carries away the heat dissipated by the front shaft 4. At the same time, in order to prevent airflow leakage at the connection between the heat dissipation shroud 2 and the air guide 20, a seal is installed between the heat dissipation shroud 2 and the air guide 20. The seal can be made of rubber or silicone. This can ensure that the airflow flows to the front shaft 4 of the motor 1 along a predetermined path, improve the sealing and stability of the heat dissipation system, ensure the reliability of the heat dissipation effect, and avoid the problem of reduced heat dissipation efficiency due to airflow leakage.
[0022] Problem 2 is: In the existing technology, when the front shaft cooling device of the motor uses the airflow plate to guide the airflow generated by the cooling fan 3 to the front shaft 4 to cool the front shaft 4, it is difficult to know the real-time temperature of the front shaft 4 in a timely manner due to the lack of intelligent temperature monitoring equipment. It is also inconvenient to adjust the airflow of the cooling fan 3 and the airflow along the air guide 20 to the front shaft 4 according to the temperature of the front shaft 4, thus affecting the stable operation of the motor 1. In order to solve the above technical problems,
[0023] like Figure 2-5As shown, the technical solution for problem one includes the addition of a temperature sensor 8, a controller 9, and a valve 6 (an electric valve). The temperature sensor 8 is installed on the front cover 7 of the motor 1 to monitor the temperature of the front shaft 4. The controller 9 is installed on the housing 11 of the motor 1 and is electrically connected to the temperature sensor 8, the valve 6, and the cooling fan 3. The controller 9 determines the opening and closing of the valve 6 and the opening degree based on the temperature of the front shaft 4 monitored by the temperature sensor 8. It can also control the speed of the cooling fan 3 based on the temperature of the front shaft 4. Specifically, the power supply of the cooling fan 3 is separated from the power supply of the motor 1, so that the speed of the cooling fan 3 is not synchronized with the speed of the motor 1. This avoids the problem of poor heat dissipation caused by the cooling fan 3 slowing down when the motor 1 speed slows down. A touch-screen human-machine interface can be installed on the controller 9. The controller 9 can preset a temperature threshold for the front shaft 4 through the human-machine interface. In the initial state, the cooling fan 3 is in a preset constant speed rotation state. When the temperature sensor 8 detects that the temperature of the front shaft 4 reaches the temperature threshold, the controller 9 controls the valve 6 to open, so that the airflow generated by the cooling fan 3 is guided along the air guide 20 to the front shaft 4 to cool the front shaft 4. When the temperature sensor 8 detects that the temperature of the front shaft 4 exceeds the preset threshold, the controller 9 increases the opening of the valve 6 and the speed of the cooling fan 3 to increase the airflow entering the air guide 20. When the temperature is lower than the preset threshold, the valve 6 is closed and the speed of the cooling fan 3 is restored. Thus, the airflow entering the front shaft 4 can be flexibly adjusted according to the actual temperature of the front shaft 4 to avoid excessive heat dissipation or insufficient heat dissipation, which helps to maintain the front shaft 4 of the motor 1 within a suitable operating temperature range and extend the service life of the motor 1.
[0024] like Figure 2-4 As shown, the temperature sensor 8 can be either an infrared sensor 13 or a resistance temperature detector (RTD) sensor 14, providing users with a variety of options, such as... Figure 4 As shown, the temperature sensor 8 is a resistance temperature detector (RTD) sensor 14 mounted on the housing 11. It indirectly measures the temperature of the front axle 4 by detecting the temperature of the housing 11. Although the temperature detection accuracy may be affected, since the front axle 4 is in motion, directly mounting it on the front axle 4 would easily cause the wires to become tangled. Figure 2-3 As shown, the temperature sensor 8 is an infrared sensor 13 mounted on the housing 11. It has the advantage of non-contact measurement and will not interfere with the normal operation of the front shaft 4 of the motor 1. It can directly measure the temperature of the front shaft 4. However, as the front shaft 4 is running, the temperature measurement accuracy of the infrared sensor 13 for the front shaft 4 may be affected.
Claims
1. A front shaft cooling device for an electric motor, comprising a guide member (20) mounted on a cooling shroud (2) of an electric motor (1) and used to guide the airflow generated by a cooling fan (3) to the front shaft (4), characterized in that: The air guide (20) is a tube that is connected to the heat dissipation shroud (2) and has an airflow cavity (5) inside. A valve (6) is installed at the air inlet of the air guide (20). A temperature sensor (8) for monitoring the temperature of the front axle (4) is installed at the front cover (7) of the motor (1). A controller (9) connected to the temperature sensor (8) is installed on the outside of the heat dissipation shroud (2). The controller (9) controls the opening of the valve (6) according to the temperature signal monitored by the temperature sensor (8).
2. The motor front shaft cooling device according to claim 1, characterized in that: The controller (9) controls the speed of the cooling fan (3) based on the temperature signal monitored by the temperature sensor (8). When the temperature exceeds the preset threshold, the controller (9) will increase the speed of the fan to increase the air volume; when the temperature is lower than the preset threshold, the controller (9) will reduce the speed of the fan.
3. The motor front shaft cooling device according to claim 2, characterized in that: The air guide (20) is located at the bottom of the motor (1), and the air outlet of the air guide (20) faces the front shaft (4) of the motor (1).
4. The motor front shaft cooling device according to claim 3, characterized in that: The front end cover (7) of the motor (1) is fixedly connected to the outer shell (11) which forms a wind chamber (10) with the front end cover (7). The top of the outer shell (11) is provided with a heat dissipation vent (12). The end of the air guide (20) away from the heat dissipation shroud (2) is connected to the wind chamber (10).
5. The motor front shaft cooling device according to claim 1, characterized in that: It also includes a seal installed between the heat dissipation shroud (2) and the air guide (20) of the motor (1).
6. The motor front shaft cooling device according to claim 1, characterized in that: The temperature sensor (8) is an infrared sensor (13) or a resistance temperature detector (RTD) sensor (14).