Direct current motor neutral line detection device

Abstract

The utility model discloses a direct current motor neutral line detection device, which relates to the technical field of direct current motor maintenance and comprises a bottom shell, a display is mounted at the bottom end of the inner side of the bottom shell, a direct current power supply detection module is mounted at the bottom end of the inner side of the bottom shell, and a time control circuit detection module is mounted at the bottom end of the inner side of the bottom shell. With the adoption of the structure, the direct-current power supply detection module, the time control circuit detection module, the display and the voltage detection module are matched with one another to carry out relative detection, when the motor is in a static state, instantaneous direct-current voltage is applied to an excitation loop, and the excitation loop is excited by utilizing the induced electromotive force direction. The electric brush is converted into direct-current positive and negative voltage through the electronic technology, the direct-current positive and negative voltage is displayed on the liquid crystal screen through the displayer, and if the electric brush is located on the neutral line, the voltage value is zero volt, and if the electric brush is not located on the neutral line, the position of the brush carrier is adjusted till the voltage value is zero volt.

Description

Technical Field

[0001] This utility model belongs to the field of DC motor maintenance technology, and specifically relates to a DC motor neutral line detection device. Background Technology

[0002] A DC motor neutral line detection device is a specialized piece of equipment used to detect the neutral line position of the brushes in a DC motor. This device is connected to the motor's excitation winding and uses a vacuum tube voltmeter to measure the induced electromotive force (EMF) of the brushes. By adjusting the brush position, the minimum value of the induced EMF is found, thus determining the neutral line position. This device is easy to operate and provides accurate measurements, making it an important tool for DC motor repair and debugging.

[0003] However, existing detection devices still have some shortcomings. Under impact loads, DC motors used in steel rolling are prone to brush holder loosening, causing the brushes to deviate from the magnetic neutral line. This results in sparks at the contact surface between the DC motor brushes and the commutator, which can cause ring fire and erosion of the commutator in severe cases. At the same time, maintenance personnel have poor judgment and adjustment effects on this fault. Due to the lack of specialized tools, the inspection of the magnetic neutral line is often neglected, resulting in poor handling effects and failure to fundamentally eliminate hidden dangers. Therefore, it is particularly important to invent a device to check whether the neutral line of a DC motor is aligned. This device will meet the maintenance personnel's needs for simple, convenient, and quick detection, and reduce faults caused by neutral line misalignment in DC motors. Utility Model Content

[0004] In view of the problems mentioned in the background art, the purpose of this utility model is to provide a DC motor neutral line detection device to solve the problems mentioned in the background art.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A DC motor neutral line detection device includes a base shell, a display installed on the inner bottom end of the base shell, a DC power supply detection module installed on the inner bottom end of the base shell, a time control circuit detection module installed on the inner bottom end of the base shell, the DC power supply detection module being located on the side adjacent to the time control circuit detection module, a voltage detection module installed on the inner bottom end of the base shell, the voltage detection module being located at the corner of the inner bottom end of the base shell, a cover being snapped onto the top of the base shell, a rectangular opening being formed at the top of the cover, an LCD screen being installed inside the rectangular opening, the position of the LCD screen being symmetrical to the position of the display, and a test button being installed at the top of the cover.

[0007] As a preferred technical solution, a slot is provided at the top of the bottom shell, and the slot is provided on the four sides near the corners of the top of the bottom shell. A matching block is fixedly connected to the bottom of the cover, and the block is engaged with the inside of the slot. The cover is engaged with the top of the bottom shell through the slot and the block.

[0008] As a preferred technical solution, a sealing ring is fixedly connected to the top of the bottom shell. The sealing ring is located on the inner side of the adjacent locking block, and the top of the sealing ring is in contact with the bottom of the shell cover.

[0009] As a preferred technical solution, a rubber pad is fixedly connected to the bottom end of the bottom shell, the rubber pad covers the bottom end of the bottom shell, and the thickness of the rubber pad is one centimeter.

[0010] As a preferred technical solution, a ventilation opening is provided on the outer side of the bottom shell, which is connected to the inner side of the bottom shell. A baffle is fixedly connected to the inner side of the ventilation opening. A strip-shaped opening is provided on the front side of the bottom shell, which is connected to the ventilation opening. A filter plate is inserted into the inner side of the strip-shaped opening, and the filter plate is located on the inner side close to the baffle.

[0011] As a preferred technical solution, a slot is provided on the inner wall of the vent. A matching plug is fixedly connected to the rear side of the filter plate. The plug is inserted into the inner side of the slot. The filter plate is inserted into the inner side of the strip opening through the plug and the slot. A sealing plate is fixedly connected to the front side of the filter plate. The sealing plate covers the front side of the strip opening. A protrusion is fixedly connected to the front side of the sealing plate. The protrusion has an arc-shaped corner.

[0012] As a preferred technical solution, a battery compartment is provided at the top of the cover, and a battery is installed inside the battery compartment. A control button is installed at the top of the cover. The battery compartment is electrically connected to the display, DC power detection module, time control circuit detection module, voltage detection module, test button and control button. The display is electrically connected to the LCD screen. The test button is electrically connected to the voltage detection module. The control button is electrically connected to the DC power detection module, time control circuit detection module and display.

[0013] In summary, the present invention has the following main advantages:

[0014] First, during use, the DC power supply detection module, the timing circuit detection module, the display, and the voltage detection module work together to perform relative detection. When the motor is stationary, an instantaneous DC voltage is applied to the excitation circuit. The direction of the induced electromotive force is used to convert it into positive and negative DC voltage using electronic technology, which is then displayed on the LCD screen. If the brush is on the neutral line, the voltage value is zero volts. If the brush is not on the neutral line, the rotor magnetic field is no longer perpendicular to the magnetic field generated by the magnetic poles, and the combined magnetic field shifts. The short-circuited winding cuts the magnetic lines of force, inducing an electromotive force that causes the voltage value of the excitation circuit to change. At this time, adjust the position of the brush holder until the voltage value is displayed as zero volts.

[0015] Secondly, the opening of the ventilation openings allows for effective ventilation and heat dissipation of the inner side of the bottom shell, which can effectively improve the heat dissipation efficiency of the electrical equipment inside the bottom shell. Due to the presence of the baffles, the air flowing through the ventilation openings can enter and exit in a deflected manner, which also makes it easier for the filter plate to filter the air. Dust and pollutants in the air can be blocked by the filter plate, thereby preventing a large amount of dust and pollutants from entering the inner side of the bottom shell through the ventilation openings, and also effectively improving the service life of the detection device. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the inner structure of the bottom shell of this utility model;

[0018] Figure 3 This is a schematic diagram of the bottom end structure of the bottom shell of this utility model;

[0019] Figure 4 This is a utility model Figure 3 A magnified structural diagram of part A;

[0020] Figure 5 This is a schematic diagram of the filter plate structure of this utility model;

[0021] Figure 6 This is a schematic diagram of the circuit structure of this utility model.

[0022] Reference numerals: 1. Bottom shell; 2. Display; 3. DC power supply detection module; 4. Time control circuit detection module; 5. Voltage detection module; 6. Vent; 7. Baffle; 8. Strip-shaped opening; 9. Slot; 10. Filter plate; 11. Insert block; 12. Sealing plate; 13. Protrusion; 14. Shell cover; 15. Rectangular opening; 16. LCD screen; 17. Test button; 18. Battery compartment; 19. Control button; 20. Rubber pad; 21. Locking block; 22. Slot; 23. Sealing ring. Detailed Implementation

[0023] Example

[0024] refer to Figures 1 to 6This embodiment of a DC motor neutral line detection device includes a base shell 1. A display 2 is mounted on the inner bottom end of the base shell 1. A DC power supply detection module 3 is mounted on the inner bottom end of the base shell 1. A time control circuit detection module 4 is mounted on the inner bottom end of the base shell 1, with the DC power supply detection module 3 located on a side close to the time control circuit detection module 4. A voltage detection module 5 is mounted on the inner bottom end of the base shell 1, located at a corner of the inner bottom end of the base shell 1. A cover 14 is snapped onto the top of the base shell 1. A rectangular opening 15 is formed at the top of the cover 14. An LCD screen 16 is mounted inside the rectangular opening 15, with the position of the LCD screen 16 symmetrical to the position of the display 2. A test button 17 is mounted on the top of the cover 14. During use, the DC power supply detection module 3 and the time control circuit detection module 4 are connected to the display 2. 4. The presence of display 2 and voltage detection module 5 integrates components such as DC power supply, time control circuit, voltage detection circuit, LCD screen 16, switch, and cables into an independent induced voltage measurement device through relative functions. When the motor is stationary, an instantaneous DC voltage is applied to the excitation circuit. The direction of the induced electromotive force is used to convert it into positive and negative DC voltage using electronic technology, which is then displayed on LCD screen 16 via display 2. If the brush is on the neutral line, the voltage value is zero volts. If the brush is not on the neutral line, the rotor magnetic field is no longer perpendicular to the magnetic field generated by the magnetic poles, and the combined magnetic field shifts. The short-circuited winding cuts the magnetic lines of force, inducing an electromotive force that causes a change in the voltage value of the excitation circuit. At this time, the brush holder position is adjusted until the voltage value is displayed as zero volts.

[0025] refer to Figure 1 and Figure 2 The top of the bottom shell 1 is provided with a slot 22, which is located on the four sides near the corners of the top of the bottom shell 1. The bottom of the cover 14 is fixedly connected with a locking block 21 that matches the slot 22. The locking block 21 is engaged with the inside of the slot 22. The cover 14 is engaged with the top of the bottom shell 1 through the slot 22 and the locking block 21. Due to the presence of the locking block 21, the engagement of the locking block 21 can effectively fix the position of the cover 14, thereby preventing the cover 14 from shifting. When it is necessary to remove the cover 14, the locking block 21 can be pulled out by the locking principle, which also facilitates the user to inspect and maintain the electrical equipment inside the bottom shell 1 later.

[0026] refer to Figure 1 and Figure 2 A sealing ring 23 is fixedly connected to the top of the bottom shell 1. The sealing ring 23 is located on the inner side of the adjacent locking block 21. The top of the sealing ring 23 is in contact with the bottom of the shell cover 14. Due to the presence of the sealing ring 23, when the shell cover 14 is closed, the sealing ring 23 can effectively seal the connection point between the two, thereby effectively improving the overall sealing performance of the device.

[0027] refer to Figure 3A rubber pad 20 is fixedly connected to the bottom end of the bottom shell 1. The rubber pad 20 covers the bottom end of the bottom shell 1 and has a thickness of one centimeter. Due to the presence of the rubber pad 20, it has good anti-slip ability and rubber shock absorption ability, which can improve the stability of the bottom shell 1 and effectively prevent the bottom end of the bottom shell 1 from being bumped.

[0028] refer to Figures 1 to 6 A vent 6 is provided on the outer side of the bottom shell 1, and the vent 6 communicates with the inner side of the bottom shell 1. A baffle 7 is fixedly connected to the inner side of the vent 6. A strip-shaped opening 8 is provided on the front side of the bottom shell 1, and the strip-shaped opening 8 communicates with the vent 6. A filter plate 10 is inserted into the inner side of the strip-shaped opening 8, and the filter plate 10 is located on the inner side close to the baffle 7. A slot 9 is provided on the inner wall of the vent 6. A matching insert 11 is fixedly connected to the rear side of the filter plate 10, and the insert 11 is inserted into the inner side of the slot 9. The filter plate 10 is inserted into the inner side of the strip-shaped opening 8 through the insert 11 and the slot 9. A sealing plate 12 is fixedly connected to the front side of the filter plate 10, and the sealing plate 12 covers the strip. A protrusion 13 is fixedly connected to the front side of the vent 8 and the front side of the sealing plate 12. The protrusion 13 has an arc-shaped corner. Due to the opening of the vent 6, the inner side of the bottom shell 1 can be effectively ventilated and cooled, which can effectively improve the heat dissipation efficiency of the electrical equipment inside the bottom shell 1. Due to the presence of the baffle 7, the air flowing in the vent 6 can enter and exit in a curved manner. At the same time, it is more conducive to the filter plate 10 to filter the flowing air. The dust and pollutants in the air can be blocked by the filter plate 10, thereby preventing a large amount of dust and pollutants from entering the inner side of the bottom shell 1 through the vent 6. It also effectively improves the service life of the detection device.

[0029] refer to Figure 1 and Figure 6 The top of the cover 14 is provided with a battery compartment 18, and a battery is installed inside the battery compartment 18. A control button 19 is installed on the top of the cover 14. The battery compartment 18 is electrically connected to the display 2, the DC power detection module 3, the time control circuit detection module 4, the voltage detection module 5, the test button 17, and the control button 19. The display 2 is electrically connected to the LCD screen 16. The test button 17 is electrically connected to the voltage detection module 5. The control button 19 is electrically connected to the DC power detection module 3, the time control circuit detection module 4, and the display 2. Due to the presence of the battery compartment 18, the electrical equipment in the device can be effectively powered so that these electrical equipment can operate normally. The control button 19 can effectively control the operation of these electrical equipment, thus making it easier for the user to operate the entire device.

[0030] Operating Principle and Advantages: During operation, a momentary DC voltage is applied to the excitation circuit while the motor is stationary, utilizing the principle of DC induction. The direction of the induced electromotive force is electronically converted into positive and negative DC voltage values, displayed on the LCD screen 16. If the brush is on the neutral line, the voltage is 0 volts. When the brush is not on the neutral line, the rotor magnetic field is no longer perpendicular to the magnetic field generated by the magnetic poles, causing a shift in the combined magnetic field. The short-circuited windings cut the magnetic lines of force, inducing an electromotive force that changes the voltage value of the excitation circuit. The brush holder position is then adjusted until the voltage value displays 0 volts. This method, combined with a DC power supply, timing circuit, voltage detection circuit, LCD screen, switch, cables, and other components, can be integrated into an independent induced voltage measuring device, solving the inconvenience caused by existing problems. The presence of the locking block 21 effectively fixes the position of the cover 14, preventing displacement. When the cover 14 needs to be removed, the locking block 21 is engaged using a snap-fit ​​principle. The bottom shell 1 can be easily pulled out, which also facilitates the user's later inspection and maintenance of the electrical equipment inside the bottom shell 1. Due to the presence of the sealing ring 23, when the shell cover 14 is closed, the sealing ring 23 can effectively seal the connection point between the two, thereby effectively improving the overall sealing performance of the device. Due to the presence of the rubber pad 20, the rubber pad 20 has good anti-slip ability and rubber shock absorption ability, thereby improving the stability of the bottom shell 1 in place, and also effectively preventing the bottom of the bottom shell 1 from being bumped. Due to the opening of the vent 6, the inside of the bottom shell 1 can be effectively ventilated and dissipated, which can effectively improve the heat dissipation efficiency of the electrical equipment inside the bottom shell 1. Due to the presence of the baffle 7, the two baffles 7 can make the air flowing in the vent 6 enter and exit in a curved manner, and also make it easier for the filter plate 10 to filter the flowing air. The dust and pollutants in the air can be blocked by the filter plate 10, thereby preventing a large amount of dust and pollutants from entering the inside of the bottom shell 1 through the vent 6, and also effectively improving the service life of the detection device.

Claims

1. A DC motor neutral line detection device, comprising a base shell (1), characterized in that: A display (2) is installed on the inner bottom of the bottom shell (1). A DC power detection module (3) is installed on the inner bottom of the bottom shell (1). A time control circuit detection module (4) is installed on the inner bottom of the bottom shell (1). The DC power detection module (3) is located on the side close to the time control circuit detection module (4). A voltage detection module (5) is installed on the inner bottom of the bottom shell (1). The voltage detection module (5) is located at the corner of the inner bottom of the bottom shell (1). A shell cover (14) is snapped onto the top of the bottom shell (1). A rectangular opening (15) is opened on the top of the shell cover (14). An LCD screen (16) is installed inside the rectangular opening (15). The position of the LCD screen (16) is symmetrical to the position of the display (2). A test button (17) is installed on the top of the shell cover (14).

2. The DC motor neutral line detection device according to claim 1, characterized in that: The top of the bottom shell (1) is provided with a slot (22), which is located on the four sides near the corner of the top of the bottom shell (1). The bottom of the shell cover (14) is fixedly connected with a locking block (21) that matches the slot (22). The locking block (21) is engaged with the inside of the slot (22). The shell cover (14) is engaged with the top of the bottom shell (1) through the slot (22) and the locking block (21).

3. The DC motor neutral line detection device according to claim 2, characterized in that: A sealing ring (23) is fixedly connected to the top of the bottom shell (1). The sealing ring (23) is located on the inner side of the adjacent block (21), and the top of the sealing ring (23) is in contact with the bottom of the shell cover (14).

4. The DC motor neutral line detection device according to claim 1, characterized in that: A rubber pad (20) is fixedly connected to the bottom end of the bottom shell (1). The rubber pad (20) covers the bottom end of the bottom shell (1) and the thickness of the rubber pad (20) is one centimeter.

5. The DC motor neutral line detection device according to claim 1, characterized in that: A ventilation opening (6) is provided on the outer side of the bottom shell (1), and the ventilation opening (6) communicates with the inner side of the bottom shell (1). A baffle (7) is fixedly connected to the inner side of the ventilation opening (6). A strip-shaped opening (8) is provided on the front side of the bottom shell (1), and the strip-shaped opening (8) communicates with the ventilation opening (6). A filter plate (10) is inserted into the inner side of the strip-shaped opening (8), and the filter plate (10) is located on the inner side close to the baffle (7).

6. The DC motor neutral line detection device according to claim 5, characterized in that: The vent (6) has a slot (9) on its inner wall. The filter plate (10) is fixedly connected to a plug (11) that matches the slot (9). The plug (11) is inserted into the inner side of the slot (9). The filter plate (10) is inserted into the inner side of the strip opening (8) through the plug (11) and the slot (9). The filter plate (10) is fixedly connected to a sealing plate (12) on its front side. The sealing plate (12) covers the front side of the strip opening (8). The sealing plate (12) is fixedly connected to a protrusion (13) on its front side. The protrusion (13) has an arc-shaped corner.

7. The DC motor neutral line detection device according to claim 1, characterized in that: The top of the cover (14) is provided with a battery compartment (18), and a battery is installed inside the battery compartment (18). The top of the cover (14) is provided with a control button (19). The battery compartment (18) is electrically connected to the display (2), DC power detection module (3), time control circuit detection module (4), voltage detection module (5), test button (17) and control button (19). The display (2) is electrically connected to the LCD screen (16). The test button (17) is electrically connected to the voltage detection module (5). The control button (19) is electrically connected to the DC power detection module (3), time control circuit detection module (4) and display (2).

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