A direct current motor with an overload protection structure

Abstract

The utility model relates to a direct current motor with overload protection structure applied to the field of direct current motor, including motor body, the output of motor body is provided with the output shaft, the lower fixed connector of motor body has bottom fixed base, the upper fixed connector of motor body has top hollow storehouse, the upper end annular equidistance of bottom fixed base is provided with a plurality of temperature sensing memory elastic pieces, a plurality of temperature sensing memory elastic pieces's upper fixed connector has outer sliding hollow ring, and the outer sliding hollow ring is located motor body outside, in above -mentioned direct current motor with overload protection structure, through the cooperation of temperature sensing memory elastic piece and first pressure sensor, second pressure sensor, the motor can perceive self heating state in real time, can cut off power supply and start cooling device cooling as soon as temperature is abnormally high, and after temperature restores normal, can also in time restore power supply, effectively avoid the motor damage due to continuous overheating, guarantee motor stable operation.

Description

Technical Field

[0001] This utility model relates to a DC motor, and more particularly to a DC motor with an overload protection structure for use in the field of DC motors. Background Technology

[0002] In industrial production and daily life, DC motors are widely used in automated production lines, electric vehicles, home appliances, and many other fields due to their advantages such as good speed regulation performance and high starting torque. However, during operation, motors often experience overload problems due to factors such as sudden load changes and poor heat dissipation.

[0003] Chinese patent CN214100842U discloses a motor alarm circuit, including: a thermal relay, an indicator light circuit, an alarm circuit, and a power supply module. The normally closed contact of the thermal relay is electrically connected to the indicator light circuit, and the normally open contact of the thermal relay is electrically connected to the alarm circuit. The power supply module is electrically connected to both the normally open and normally closed contacts of the thermal relay. The output terminal of the thermal relay is used to connect to the motor, and the input terminal of the thermal relay is used to connect to a three-phase power supply. This solves the problem that existing thermal relays cannot handle motor faults.

[0004] Some existing motors rely on simple thermal relays for overload protection, but thermal relays have a slow response speed and cannot react to abnormal increases in motor temperature in the first instance, causing the motor to be in an overheated state for a long time, accelerating the aging of winding insulation and reducing the service life of the motor. Utility Model Content

[0005] The technical problem that this utility model aims to solve in view of the above-mentioned prior art is that some existing motors rely on simple thermal relays for overload protection. However, thermal relays have a slow response speed and are difficult to react in the first moment when the motor temperature rises abnormally, causing the motor to be in an overheated state for a long time, accelerating the aging of winding insulation and reducing the service life of the motor.

[0006] To address the aforementioned problems, this utility model provides a DC motor with an overload protection structure, comprising a motor body, an output shaft at the output end of the motor body, a bottom mounting base fixedly connected to the lower end of the motor body, a top hollow chamber fixedly connected to the upper end of the motor body, a plurality of temperature-sensitive memory elastic elements arranged in a ring at equal intervals at the upper end of the bottom mounting base, an outer sliding hollow ring fixedly connected to the upper end of the plurality of temperature-sensitive memory elastic elements, the outer sliding hollow ring being located outside the motor body, a plurality of first pressure sensors arranged in a ring at equal intervals at the lower end of the top hollow chamber, a plurality of second pressure sensors arranged in a ring at equal intervals at the upper end of the bottom mounting base, the outer sliding hollow ring being in contact with the plurality of first pressure sensors and second pressure sensors respectively, the outer sliding hollow ring, the plurality of first pressure sensors and the plurality of second pressure sensors being distributed on the outside of the motor body, and a controller fixedly connected to the front end of the top hollow chamber.

[0007] In the aforementioned DC motor with overload protection structure, through the cooperation of the temperature-sensing memory elastic element and the first and second pressure sensors, the motor can sense its own heating status in real time. Once the temperature rises abnormally, the power supply can be quickly cut off and the cooling device can be activated to cool down. After the temperature returns to normal, the power supply can be restored in time, effectively preventing the motor from being damaged due to continuous overheating and ensuring the stable operation of the motor.

[0008] As a further improvement of this application, an electrically conductive cooling fan blade is fixedly connected to the inner end of the top hollow compartment, and a perforated mesh surface layer is fixedly connected to the lower end of the electrically conductive cooling fan blade.

[0009] As a further improvement to this application, the perforated mesh surface is located above the motor body, and multiple storage hollow compartments are opened on the outer side of the outer sliding hollow ring.

[0010] As a further improvement of this application, a temperature sensor is fixedly connected to the inner end of the hollow storage compartment, and the temperature sensor cooperates with the motor body.

[0011] As another improvement of this application, an auxiliary monitoring module is fixedly connected to the front end of the controller, and the auxiliary monitoring module is electrically connected to multiple temperature sensors.

[0012] As a further improvement to this application, a protective outer frame is provided on the outside of the motor body, and the protective outer frame is located between the top hollow compartment and the bottom fixed base.

[0013] As a further improvement to this application, the outer side of the protective cover frame is provided with a number of heat dissipation mesh openings, which are evenly distributed among the openings.

[0014] In summary, this solution, through the cooperation of the temperature-sensing memory elastic component and the first and second pressure sensors, enables the motor to sense its own heating status in real time. Once the temperature rises abnormally, the power supply can be quickly cut off and the cooling device can be activated to lower the temperature. After the temperature returns to normal, the power supply can be restored in a timely manner, effectively preventing the motor from being damaged by continuous overheating and ensuring stable operation of the motor. In addition, multiple temperature sensors move with the outer sliding hollow ring, which can collect multi-dimensional heating data of the motor body surface. The auxiliary monitoring module analyzes this data, and once an abnormality is detected, an alarm is immediately issued, which facilitates the timely investigation and handling of potential faults by the staff, reduces the risk of motor failure, and reduces maintenance costs and downtime. Attached Figure Description

[0015] Figure 1 This is an isometric view of the protective outer casing frame according to the first embodiment of this application;

[0016] Figure 2 This is a structural diagram of the motor body according to the first embodiment of this application;

[0017] Figure 3 This is the first embodiment of the present application. Figure 2 Enlarged view of a partial truncated section of the motor body;

[0018] Figure 4 These are displacement state diagrams of the outer sliding hollow ring in the first and second embodiments of this application;

[0019] Figure 5 This is the first embodiment of the present application. Figure 4 Enlarged view of a partial section of the sliding hollow rings from China and abroad;

[0020] Figure 6 This is an internal view of the top hollow compartment in the first embodiment of this application;

[0021] Figure 7 This is a structural diagram of the perforated mesh surface layer according to the first embodiment of this application.

[0022] Explanation of the labels in the diagram:

[0023] 1. Motor body; 2. Bottom mounting base; 3. Temperature-sensitive memory elastic element; 4. Outer sliding hollow ring; 5. Top hollow compartment; 6. Electrically cooled fan blades; 7. First pressure sensor; 8. Second pressure sensor; 10. Storage hollow compartment; 11. Controller; 12. Output shaft; 13. Auxiliary monitoring module; 14. Protective outer frame; 15. Heat dissipation mesh; 16. Perforated mesh surface layer; 17. Temperature sensor. Detailed Implementation

[0024] The two embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0025] First implementation method:

[0026] Figures 1-6 A DC motor with an overload protection structure is shown, including a motor body 1, an output shaft 12 at the output end of the motor body 1, a bottom mounting base 2 fixedly connected to the lower end of the motor body 1, a top hollow chamber 5 fixedly connected to the upper end of the motor body 1, a plurality of temperature-sensitive memory elastic elements 3 are arranged in an annular shape at equal intervals at the upper end of the bottom mounting base 2, an outer sliding hollow ring 4 is fixedly connected to the upper end of the plurality of temperature-sensitive memory elastic elements 3, the outer sliding hollow ring 4 is located outside the motor body 1, a plurality of first pressure sensors 7 are arranged in an annular shape at equal intervals at the lower end of the top hollow chamber 5, a plurality of second pressure sensors 8 are arranged in an annular shape at equal intervals at the upper end of the bottom mounting base 2, the outer sliding hollow ring 4 is in contact with the plurality of first pressure sensors 7 and second pressure sensors 8 respectively, the outer sliding hollow ring 4, the plurality of first pressure sensors 7 and the plurality of second pressure sensors 8 are all distributed on the outside of the motor body 1, and a controller 11 is fixedly connected to the front end of the top hollow chamber 5.

[0027] Figures 4-7 An electric cooling fan blade 6 is fixedly connected to the inner end of the top hollow chamber 5. A perforated mesh layer 16 is fixedly connected to the lower end of the electric cooling fan blade 6. The perforated mesh layer 16 is located above the motor body 1. A protective outer frame 14 is provided on the outer side of the motor body 1. The protective outer frame 14 is located between the top hollow chamber 5 and the bottom fixed base 2. Several heat dissipation mesh holes 15 are opened on the outer side of the protective outer frame 14. The several heat dissipation mesh holes 15 are evenly distributed among them.

[0028] Figures 1-7This diagram illustrates a DC motor with an overload protection structure. During operation of the motor body 1, heat is generated in its internal windings due to current flow. This heat is conducted to a temperature-sensitive memory elastic element 3 in direct contact with it. The temperature-sensitive memory elastic element 3 is made of a special material with thermal expansion and contraction properties. As the absorbed heat increases, its temperature rises and it undergoes physical deformation, specifically by gradually stretching and elongating upwards. The stretching of the temperature-sensitive memory elastic element 3 causes the outer sliding hollow ring 4, which is fixedly connected to it, to move upwards along the radial direction of the motor body 1. When the outer sliding hollow ring 4 rises to contact the first pressure sensor 7, the sensing element of the first pressure sensor 7 generates a corresponding electrical signal change due to the pressure applied by the outer sliding hollow ring 4. This changed electrical signal is rapidly transmitted to the controller 11 through a preset circuit. After receiving the signal from the first pressure sensor 7, the microprocessor built into the controller 11 sends a control command to the power supply circuit of the motor body 1 to cut off the power supply to the motor body 1, causing the motor body 1 to stop operating and preventing more serious damage caused by continuous overload heating. On the other hand... The system sends a start signal to the electric cooling fan blades 6 inside the hollow top chamber 5. The electric cooling fan blades 6 then begin to rotate at high speed. The cool air generated by the rotating electric cooling fan blades 6 flows downwards through the perforated mesh layer 16 at its lower end. The perforated mesh layer 16 can effectively guide and disperse the cool air, ensuring it is evenly blown onto the surface of the motor body 1, accelerating heat dissipation and cooling the motor body 1. As the surface temperature of the motor body 1 decreases, the heat absorbed by the temperature-sensitive memory elastic element 3 gradually decreases, and it begins to return to its initial temperature. In the initial state, that is, gradually shrinking and shortening, the shrinkage of the temperature-sensitive memory elastic element 3 causes the outer sliding hollow ring 4 to move downward. When the outer sliding hollow ring 4 descends to contact the second pressure sensor 8, the sensing element of the second pressure sensor 8 generates an electrical signal change due to the force, and transmits the signal to the controller 11. After receiving the signal from the second pressure sensor 8, the microprocessor of the controller 11 sends a command to the power supply circuit of the motor body 1 according to the preset control logic to restore the power supply of the motor body 1 and make the motor body 1 restart operation.

[0029] Second implementation method:

[0030] Figure 4Multiple storage compartments 10 are provided on the outer side of the outer sliding hollow ring 4. Temperature sensors 17 are fixedly connected to the inner ends of the storage compartments 10. The temperature sensors 17 cooperate with the motor body 1. An auxiliary monitoring module 13 is fixedly connected to the front end of the controller 11. The auxiliary monitoring module 13 and the multiple temperature sensors 17 are electrically connected. During the entire process of the temperature-sensing memory elastic element 3 moving up and down, the multiple temperature sensors 17 fixed on the outer side of the outer sliding hollow ring 4 move synchronously. The temperature sensors 17 collect temperature data from multiple locations on the surface of the motor body 1 in real time, realizing the monitoring of the motor... The actual heating status of the motor body 1 is monitored from multiple dimensions. This temperature data is transmitted to the auxiliary monitoring module 13 in the controller 11 via wired or wireless means. The auxiliary monitoring module 13 analyzes and processes the received temperature data. By comparing the temperature data at different locations and times, it determines whether the heating of the motor body 1 is uniform and whether there are any abnormal heating points. When the monitoring data shows obvious abnormalities, such as the temperature difference between each monitoring point exceeding the preset range, the auxiliary monitoring module 13 triggers the alarm device and issues an alarm signal to remind the staff to inspect the motor and promptly investigate and resolve potential faults.

[0031] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this utility model.

Claims

1. A DC motor with an overload protection structure, characterized in that: The device includes a motor body (1), an output shaft (12) at the output end of the motor body (1), a bottom fixing seat (2) fixedly connected to the lower end of the motor body (1), a top hollow chamber (5) fixedly connected to the upper end of the motor body (1), a plurality of temperature-sensitive memory elastic elements (3) are arranged in a ring at equal intervals at the upper end of the bottom fixing seat (2), an outer sliding hollow ring (4) fixedly connected to the upper end of the plurality of temperature-sensitive memory elastic elements (3), the outer sliding hollow ring (4) being located outside the motor body (1), and the top hollow chamber... (5) has a plurality of first pressure sensors (7) arranged in a ring at equal intervals at the lower end, and a plurality of second pressure sensors (8) arranged in a ring at equal intervals at the upper end of the bottom fixed base (2). The outer sliding hollow ring (4) is in contact with the plurality of first pressure sensors (7) and the second pressure sensors (8) respectively. The outer sliding hollow ring (4), the plurality of first pressure sensors (7) and the plurality of second pressure sensors (8) are all distributed on the outside of the motor body (1). The front end of the top hollow chamber (5) is fixedly connected to a controller (11).

2. A DC motor with an overload protection structure according to claim 1, characterized in that: An electric cooling fan blade (6) is fixedly connected to the inner end of the top hollow chamber (5), and a perforated mesh layer (16) is fixedly connected to the lower end of the electric cooling fan blade (6).

3. A DC motor with an overload protection structure according to claim 2, characterized in that: The hollow mesh layer (16) is located above the motor body (1), and multiple storage hollow compartments (10) are opened on the outer side of the outer sliding hollow ring (4).

4. A DC motor with an overload protection structure according to claim 3, characterized in that: A temperature sensor (17) is fixedly connected to the inner end of the hollow storage compartment (10), and the temperature sensor (17) cooperates with the motor body (1).

5. A DC motor with an overload protection structure according to claim 4, characterized in that: The front end of the controller (11) is fixedly connected to an auxiliary monitoring module (13), and the auxiliary monitoring module (13) is electrically connected to multiple temperature sensors (17).

6. A DC motor with an overload protection structure according to claim 1, characterized in that: The motor body (1) is provided with a protective outer frame (14) on the outside, which is located between the top hollow chamber (5) and the bottom fixed seat (2).

7. A DC motor with an overload protection structure according to claim 6, characterized in that: The outer side of the protective outer frame (14) is provided with a plurality of heat dissipation mesh holes (15), and the plurality of heat dissipation mesh holes (15) are evenly distributed among them.

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