Brushless motor application circuit for automatic paint stripping of enameled wire

Abstract

The utility model relates to a brushless motor application circuit for automatic paint stripping of an enameled wire, which comprises a master control MCU (Microprogrammed Control Unit), a power supply module, a grid driving module, a three-phase bridge driving module and a three-phase electromotive force acquisition module, and is characterized in that the power supply module is connected with the master control MCU, the grid driving module and the three-phase bridge driving module and provides a power supply; the three-phase electromotive force acquisition module is arranged between the main control MCU and the three-phase bridge driving module, the input end of the gate driving module is connected with the PWM modulation end of the main control MCU, and the output end of the gate driving module is connected with the three-phase bridge driving module. The efficient performance of the brushless motor in the circuit enables the working efficiency of the paint stripping machine to be remarkably improved, stable control of the paint stripping machine is achieved through accurate control algorithm and logic, the product quality is improved, the noise is low, the operation environment is more comfortable, the cost is reduced, the advanced power supply technology and the signal acquisition technology are adopted, and the cost is reduced. And the safety of the paint stripping machine is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cables and wires, in particular to a brushless motor application circuit for automatic paint stripping of enameled wires. Background Art

[0002] In the existing enameled wire paint stripping technology, the traditional brush motor driven paint stripping machine has a series of technical problems and defects, such as short life, loud noise, unstable performance, electric spark interference and safety hazards.

[0003] Short life: Due to the shortcomings of the mechanical structure design, traditional brushless motors wear and tear quickly, resulting in a relatively short motor life. Frequent maintenance and replacement not only increase costs, but also affect production efficiency;

[0004] Loud noise: During operation, brushless motors generate loud noise due to mechanical friction and commutation sparks, which not only affects the comfort of the operating environment, but may also damage the hearing of the operator;

[0005] Unstable performance: Under low speed and high load conditions, brushless motors are prone to unstable control, resulting in uneven paint stripping and affecting product quality.

[0006] Spark interference: The sparks generated by brushed motors during commutation may interfere with other electronic devices, causing signal distortion or equipment failure, especially in situations that are sensitive to electromagnetic interference.

[0007] Safety hazards: Traditional paint stripping machines are usually powered by AC, which poses electrical safety hazards such as electric shock and fire risks. Utility Model Content

[0008] The utility model provides a brushless motor application circuit for automatic paint stripping of enameled wire, aiming to solve the problems of short life, high noise, unstable performance, electric spark interference and potential safety hazards of paint stripping machines driven by brush motors.

[0009] The utility model provides an application circuit of a brushless motor for automatic paint stripping of enameled wires, comprising a main control MCU, a power supply module, a gate drive module, a three-phase bridge drive module and a three-phase electromotive force acquisition module, wherein the power supply module is connected to the main control MCU, the gate drive module and the three-phase bridge drive module and provides power, the three-phase electromotive force acquisition module is arranged between the main control MCU and the three-phase bridge drive module, the input end of the gate drive module is connected to the PWM modulation end of the main control MCU, and the output end of the gate drive module is respectively connected to the three-phase bridge drive module.

[0010] As a further improvement of the utility model, the power supply module includes a voltage regulator chip U4 and a voltage regulator chip U7, pin 2 of the voltage regulator chip U4 is connected to an external power supply, pin 3 of the voltage regulator chip U4 outputs a 3.3V voltage, pin 1 of the voltage regulator chip U7 is connected to an external power supply, pin 3 of the power supply chip U7 outputs a 12V voltage, pin 2 of the voltage regulator chip U4 and pin 2 of the voltage regulator chip U7 are both grounded, and both ends of the battery power supply output a 12V battery voltage.

[0011] As a further improvement of the utility model, the power supply module also includes a field effect transistor Q1 and a transistor Q2, the source of the field effect transistor Q1 is connected to an external power supply, the drain of the field effect transistor Q1 is connected to a DC 12V voltage, the gate of the field effect transistor Q1 is connected to the collector of the transistor Q2, the emitter of the transistor Q2 is grounded, and the base of the transistor Q2 is connected to pin 17 of the main control MCU.

[0012] As a further improvement of the utility model, the gate drive module includes a drive chip U6, a diode D1, a diode D2 and a diode D3, the 22nd pin of the drive chip U6 is connected to the 14th pin of the main control MCU, the 1st pin of the drive chip U6 is connected to the 16th pin of the main control MCU, the 23rd pin of the drive chip U6 is connected to the 15th pin of the main control MCU, the 2nd pin of the drive chip U6 is connected to the 2nd pin of the main control MCU, the 24th pin of the drive chip U6 is connected to the 20th pin of the main control MCU, the 3rd pin of the drive chip U6 is connected to the 1st pin of the main control MCU, the positive pole of the diode D1 is connected to the 12V voltage, and the negative pole of the diode D1 is connected to the drive The 20th pin of chip U6 is connected, the cathode of diode D1 is connected to one end of capacitor C16, the other end of capacitor C16 is connected to pin 18 of driving chip U6, the anode of diode D2 is connected to 12V voltage, the cathode of diode D2 is connected to pin 17 of driving chip U6, the cathode of diode D2 is connected to one end of capacitor C17, the other end of capacitor C17 is connected to pin 15 of driving chip U6, the anode of diode D3 is connected to 12V voltage, the cathode of diode D3 is connected to pin 14 of driving chip U6, the cathode of diode D3 is connected to one end of capacitor C18, and the other end of capacitor C18 is connected to pin 12 of driving chip U6.

[0013] As a further improvement of the utility model, the three-phase bridge drive module includes a U-phase rotor U1, a V-phase rotor U2 and a W-phase rotor U3, the 19th pin of the drive chip U6 is connected to the 4th pin of the U-phase rotor U1, the 11th pin of the drive chip U6 is connected to the 2nd pin of the U-phase rotor U1, the 3rd, 7th and 8th pins of the U-phase rotor U1 are connected to the 18th pin of the drive chip U6, the 5th and 6th pins of the U-phase rotor U1 are connected to the 12V battery voltage, the 16th pin of the drive chip U6 is connected to the 4th pin of the V-phase rotor U2, the 10th pin of the drive chip U6 is connected to the 2nd pin of the V-phase rotor U2, the 3rd, 7th and 8th pins of the V-phase rotor U2 are connected to the 15th pin of the drive chip U6 , pins 5 and 6 of the V-phase rotor U2 are connected to the 12V battery voltage, pin 13 of the driving chip U6 is connected to pin 4 of the W-phase rotor U3, pin 9 of the driving chip U6 is connected to pin 2 of the W-phase rotor U3, pins 3, 7, and 8 of the W-phase rotor U3 are connected to pin 12 of the driving chip U6, pins 5 and 6 of the W-phase rotor U3 are connected to the 12V battery voltage, pin 1 of the U-phase rotor U1, pin 1 of the V-phase rotor U2, and pin 1 of the W-phase rotor U3 are connected and connected to one end of the resistor R20, the other end of the resistor R20 is connected to the digital ground, one end of the resistor R28 is connected to one end of the resistor R20, and the other end of the resistor R28 is connected to pin 8 of the main control MCU.

[0014] As a further improvement of the utility model, the three-phase electromotive force acquisition module includes resistors R5, R6 and R7, one end of the resistor R5 is connected to pin 9 of the main control MCU, the other end of the resistor R5 is connected to pins 3, 7, and 8 of the W-phase rotor, one end of the resistor R6 is connected to pin 10 of the main control MCU, the other end of the resistor R6 is connected to pins 3, 7, and 8 of the V-phase rotor, one end of the resistor R7 is connected to pin 11 of the main control MCU, the other end of the resistor R7 is connected to pins 3, 7, and 8 of the U-phase rotor, pin 12 of the main control MCU is connected to one end of the resistor R8, the other end of the resistor R8 is connected to a 12V voltage, one end of the resistor R29 is connected to one end of the resistor R8, the other end of the resistor R29 is connected to one end of the capacitor C8, and the other end of the capacitor C8 is connected to pin 12 of the main control MCU.

[0015] As a further improvement of the utility model, it also includes a switch debugger, wherein pin 5 of the switch debugger is connected to a 12V battery voltage, pin 1 of the switch debugger is connected to a 3.3V voltage, pin 2 of the switch debugger is connected to one end of a resistor R2, the other end of the resistor R2 is connected to pin 13 of a main control MCU, pin 3 of the switch debugger is connected to a digital ground, a capacitor C6 is provided between pins 2 and 3 of the switch debugger, and pin 4 of the switch debugger is connected to a 12V voltage.

[0016] As a further improvement of the utility model, it also includes a start-stop button, one end of which is connected to a 3.3V voltage, the other end of which is connected to one end of a resistor R4, and the other end of the resistor R4 is connected to pin 7 of the main control MCU.

[0017] As a further improvement of the present invention, the model of the main control MCU is STM32G030F6P6.

[0018] The beneficial effects of the utility model are: the high efficiency performance of the brushless motor used in the circuit significantly improves the working efficiency of the paint stripping machine, and through precise control algorithms and logic, stable control of the paint stripping machine is achieved, improving product quality, the low noise characteristics make the operating environment more comfortable, the long life reduces the frequency of maintenance and replacement, and reduces costs, and the use of advanced power supply technology and signal acquisition technology improves the safety of the paint stripping machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a connection relationship diagram between various modules of the utility model;

[0020] Figure 2 It is the circuit connection diagram of the main control MCU of the utility model;

[0021] Figure 3 It is a circuit connection diagram of the power supply module of the utility model;

[0022] Figure 4 It is a circuit connection diagram of the gate drive module of the utility model;

[0023] Figure 5 This is a circuit connection diagram of the three-phase bridge drive module of the utility model;

[0024] Figure 6 It is a circuit connection diagram of the three-phase electromotive force acquisition module of the utility model;

[0025] Figure 7 It is the circuit connection diagram of the switch debugger of the utility model;

[0026] Figure 8 The utility model is a circuit connection diagram of the start-stop button. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in conjunction with the accompanying drawings and embodiments. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the accompanying drawings, and the words "bottom surface" and "top surface", "inside" and "outside" refer to the directions toward or away from the geometric center of a specific component, respectively.

[0028] The utility model provides an application circuit of a brushless motor for automatic paint stripping of enameled wires, comprising a main control MCU, a power supply module, a gate drive module, a three-phase bridge drive module and a three-phase electromotive force acquisition module, wherein the power supply module is connected to the main control MCU, the gate drive module and the three-phase bridge drive module and provides power, the three-phase electromotive force acquisition module is arranged between the main control MCU and the three-phase bridge drive module, the input end of the gate drive module is connected to the PWM modulation end of the main control MCU, and the output end of the gate drive module is respectively connected to the three-phase bridge drive module.

[0029] As an embodiment of the utility model, the power supply module includes a voltage regulator chip U4 and a voltage regulator chip U7, pin 2 of the voltage regulator chip U4 is connected to an external power supply, pin 3 of the voltage regulator chip U4 outputs a 3.3V voltage, pin 1 of the voltage regulator chip U7 is connected to an external power supply, pin 3 of the power supply chip U7 outputs a 12V voltage, pin 2 of the voltage regulator chip U4 and pin 2 of the voltage regulator chip U7 are both grounded, and both ends of the battery power supply output a 12V battery voltage.

[0030] As another embodiment of the utility model, the power supply module also includes a field effect transistor Q1 and a transistor Q2, the source of the field effect transistor Q1 is connected to an external power supply, the drain of the field effect transistor Q1 is connected to a DC 12V voltage, the gate of the field effect transistor Q1 is connected to the collector of the transistor Q2, the emitter of the transistor Q2 is grounded, and the base of the transistor Q2 is connected to pin 17 of the main control MCU.

[0031] This part adopts efficient and stable power conversion technology to ensure that the paint stripping machine can obtain continuous and stable power supply when working, so as to ensure the continuity and stability of the paint stripping process. The power supply module provides multiple stable voltage supplies for other modules, including 12V DC voltage, 3.3V DC voltage and 12V voltage supplied by the battery. The model of the voltage regulator chip U4 is DS8367-33A3, and the model of the voltage regulator chip U7 is CE6601A120PT.

[0032] The main control MCU is the core of the whole circuit. The MCU control part realizes precise control of the paint stripping machine through built-in advanced control algorithms and logic. This design enables the paint stripping machine to be flexibly adjusted according to different work requirements, improving work efficiency and adaptability. The chip model of the main control MCU is STM32G030F6P6.

[0033] As another embodiment of the utility model, the gate drive module includes a driving chip U6, a diode D1, a diode D2 and a diode D3, the 22nd pin of the driving chip U6 is connected to the 14th pin of the main control MCU, the 1st pin of the driving chip U6 is connected to the 16th pin of the main control MCU, the 23rd pin of the driving chip U6 is connected to the 15th pin of the main control MCU, the 2nd pin of the driving chip U6 is connected to the 2nd pin of the main control MCU, the 24th pin of the driving chip U6 is connected to the 20th pin of the main control MCU, the 3rd pin of the driving chip U6 is connected to the 1st pin of the main control MCU, the positive pole of the diode D1 is connected to the 12V voltage, and the negative pole of the diode D1 is connected to the driving The cathode of diode D1 is connected to pin 20 of driver chip U6, the cathode of diode D1 is connected to one end of capacitor C16, the other end of capacitor C16 is connected to pin 18 of driver chip U6, the anode of diode D2 is connected to 12V voltage, the cathode of diode D2 is connected to pin 17 of driver chip U6, the cathode of diode D2 is connected to one end of capacitor C17, the other end of capacitor C17 is connected to pin 15 of driver chip U6, the anode of diode D3 is connected to 12V voltage, the cathode of diode D3 is connected to pin 14 of driver chip U6, the cathode of diode D3 is connected to one end of capacitor C18, and the other end of capacitor C18 is connected to pin 12 of driver chip U6.

[0034] As another embodiment of the utility model, the three-phase bridge drive module includes a U-phase rotor U1, a V-phase rotor U2 and a W-phase rotor U3, the 19th pin of the drive chip U6 is connected to the 4th pin of the U-phase rotor U1, the 11th pin of the drive chip U6 is connected to the 2nd pin of the U-phase rotor U1, the 3rd, 7th and 8th pins of the U-phase rotor U1 are connected to the 18th pin of the drive chip U6, the 5th and 6th pins of the U-phase rotor U1 are connected to the 12V battery voltage, the 16th pin of the drive chip U6 is connected to the 4th pin of the V-phase rotor U2, the 10th pin of the drive chip U6 is connected to the 2nd pin of the V-phase rotor U2, the 3rd, 7th and 8th pins of the V-phase rotor U2 are connected to the 15th pin of the drive chip U6 , pins 5 and 6 of the V-phase rotor U2 are connected to the 12V battery voltage, pin 13 of the driving chip U6 is connected to pin 4 of the W-phase rotor U3, pin 9 of the driving chip U6 is connected to pin 2 of the W-phase rotor U3, pins 3, 7, and 8 of the W-phase rotor U3 are connected to pin 12 of the driving chip U6, pins 5 and 6 of the W-phase rotor U3 are connected to the 12V battery voltage, pin 1 of the U-phase rotor U1, pin 1 of the V-phase rotor U2, and pin 1 of the W-phase rotor U3 are connected and connected to one end of the resistor R20, the other end of the resistor R20 is connected to the digital ground, one end of the resistor R28 is connected to one end of the resistor R20, and the other end of the resistor R28 is connected to pin 8 of the main control MCU.

[0035] The use of brushless motor drive technology is one of the core innovations of this solution. Through this technology, the circuit can achieve precise control of the brushless motor, thereby significantly improving the working efficiency and stability of the paint stripping machine. The use of brushless motors also reduces noise and electromagnetic interference, and improves the quality of the working environment. The driver chip U6 model adopts LN4318QR. The models of U-phase rotor U1, V-phase rotor U2 and W-phase rotor U3 adopt AP90N03GD.

[0036] As another embodiment of the utility model, the three-phase electromotive force acquisition module includes resistors R5, R6 and R7, one end of the resistor R5 is connected to pin 9 of the main control MCU, the other end of the resistor R5 is connected to pins 3, 7, and 8 of the W-phase rotor, one end of the resistor R6 is connected to pin 10 of the main control MCU, the other end of the resistor R6 is connected to pins 3, 7, and 8 of the V-phase rotor, one end of the resistor R7 is connected to pin 11 of the main control MCU, the other end of the resistor R7 is connected to pins 3, 7, and 8 of the U-phase rotor, pin 12 of the main control MCU is connected to one end of the resistor R8, the other end of the resistor R8 is connected to a 12V voltage, one end of the resistor R29 is connected to one end of the resistor R8, the other end of the resistor R29 is connected to one end of the capacitor C8, and the other end of the capacitor C8 is connected to pin 12 of the main control MCU.

[0037] This part can accurately judge the position and state of the motor rotor by real-time monitoring of the three-phase electromotive force of the brushless motor. This design ensures accurate control of the paint stripping machine during operation and improves the paint stripping quality and production efficiency.

[0038] As another embodiment of the utility model, it also includes a switch debugger, wherein pin 5 of the switch debugger is connected to a 12V battery voltage, pin 1 of the switch debugger is connected to a 3.3V voltage, pin 2 of the switch debugger is connected to one end of a resistor R2, the other end of the resistor R2 is connected to pin 13 of a main control MCU, pin 3 of the switch debugger is connected to a digital ground, a capacitor C6 is provided between pins 2 and 3 of the switch debugger, and pin 4 of the switch debugger is connected to a 12V voltage.

[0039] As another embodiment of the utility model, it also includes a start-stop button, one end of which is connected to a 3.3V voltage, the other end of which is connected to one end of a resistor R4, and the other end of the resistor R4 is connected to pin 7 of the main control MCU.

[0040] This part is responsible for real-time acquisition of working status signals of the paint stripper, including but not limited to key parameters such as voltage, current and speed. These signal data provide important reference for the main control MCU control part, ensuring the accuracy and reliability of control decisions. The start / stop button is pulled down by default and does not rotate, and starts at a high level.

[0041] The working principle of the circuit is as follows: by rotating the switch modulator, the voltage regulator chip U4 or the voltage regulator chip U7 works to power the circuit. The 2 pins of the switch modulator are sliding rheostats. The resistance of the connected circuit can be adjusted by the knob and input into the main control MCU through the SPD port. The main control MCU adjusts the output PWM modulation signal according to the input resistance. The output PWM signal is input into the driver chip U6. The driver chip U6 controls the rotation of the U-phase rotor U1, the V-phase rotor U2 and the W-phase rotor U3. At the same time, the three-phase electromotive force acquisition module acquires the electromotive force of the three phases U, V and W, and transmits it back to the main control MCU through the three ports FU, FV and FW. The main control MCU determines whether the three-phase rotor rotates according to the input speed based on the feedback electromotive force. If not, it is adjusted through the gate drive module. During the rotation of the brushless motor, the main control MCU will read the input resistance through the SPD port, and then adjust the speed of the brushless motor accordingly, thereby achieving precise control of the brushless motor. The motor speed can also be monitored in real time through the three-phase electromotive force acquisition module. When an abnormal situation occurs, the main control MCU can make timely adjustments to avoid the occurrence of abnormal situations.

[0042] This utility model innovatively designs a brushless motor application control circuit for an enameled wire paint stripping machine by deeply applying brushless motor technology. This circuit not only successfully solves the common problems of traditional brushless motors in paint stripping machines, but also significantly improves the performance, stability and reliability of paint stripping machines. This forward-looking control circuit design is expected to be widely used in many fields such as wire and cable processing, electronic component manufacturing, and automobile maintenance, bringing higher efficiency and convenience to paint stripping machine operation.

[0043] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A brushless motor application circuit for automatic paint stripping of enameled wire, characterized in that: It includes a main control MCU, a power supply module, a gate drive module, a three-phase bridge drive module and a three-phase electromotive force acquisition module. The power supply module is connected to the main control MCU, the gate drive module and the three-phase bridge drive module and provides power. The three-phase electromotive force acquisition module is arranged between the main control MCU and the three-phase bridge drive module. The input end of the gate drive module is connected to the PWM modulation end of the main control MCU, and the output end of the gate drive module is respectively connected to the three-phase bridge drive module.

2. The brushless motor application circuit for automatic paint stripping of enameled wire according to claim 1 is characterized in that: The power supply module includes a voltage regulator chip U4 and a voltage regulator chip U7. Pin 2 of the voltage regulator chip U4 is connected to an external power supply, and pin 3 of the voltage regulator chip U4 outputs a 3.3V voltage. Pin 1 of the voltage regulator chip U7 is connected to an external power supply, and pin 3 of the power supply chip U7 outputs a 12V voltage. Pin 2 of the voltage regulator chip U4 and pin 2 of the voltage regulator chip U7 are both grounded, and both ends of the battery power supply output a 12V battery voltage.

3. The brushless motor application circuit for automatic paint stripping of enameled wire according to claim 2 is characterized in that: The power supply module also includes a field effect transistor Q1 and a transistor Q2, the source of the field effect transistor Q1 is connected to an external power supply, the drain of the field effect transistor Q1 is connected to a DC 12V voltage, the gate of the field effect transistor Q1 is connected to the collector of the transistor Q2, the emitter of the transistor Q2 is grounded, and the base of the transistor Q2 is connected to pin 17 of the main control MCU.

4. The brushless motor application circuit for automatic paint stripping of enameled wire according to claim 2 is characterized in that: The gate drive module includes a drive chip U6, a diode D1, a diode D2 and a diode D3. Pin 22 of the drive chip U6 is connected to pin 14 of the main control MCU, pin 1 of the drive chip U6 is connected to pin 16 of the main control MCU, pin 23 of the drive chip U6 is connected to pin 15 of the main control MCU, pin 2 of the drive chip U6 is connected to pin 2 of the main control MCU, pin 24 of the drive chip U6 is connected to pin 20 of the main control MCU, pin 3 of the drive chip U6 is connected to pin 1 of the main control MCU, the positive pole of the diode D1 is connected to a 12V voltage, and the negative pole of the diode D1 is connected to pin 20 of the drive chip U6. Pins are connected, the cathode of diode D1 is connected to one end of capacitor C16, the other end of capacitor C16 is connected to pin 18 of driver chip U6, the anode of diode D2 is connected to 12V voltage, the cathode of diode D2 is connected to pin 17 of driver chip U6, the cathode of diode D2 is connected to one end of capacitor C17, the other end of capacitor C17 is connected to pin 15 of driver chip U6, the anode of diode D3 is connected to 12V voltage, the cathode of diode D3 is connected to pin 14 of driver chip U6, the cathode of diode D3 is connected to one end of capacitor C18, and the other end of capacitor C18 is connected to pin 12 of driver chip U6.

5. The brushless motor application circuit for automatic paint stripping of enameled wire according to claim 4 is characterized in that: The three-phase bridge drive module includes a U-phase rotor U1, a V-phase rotor U2 and a W-phase rotor U3. Pin 19 of the drive chip U6 is connected to pin 4 of the U-phase rotor U1, pin 11 of the drive chip U6 is connected to pin 2 of the U-phase rotor U1, pins 3, 7 and 8 of the U-phase rotor U1 are connected to pin 18 of the drive chip U6, pins 5 and 6 of the U-phase rotor U1 are connected to a 12V battery voltage, pin 16 of the drive chip U6 is connected to pin 4 of the V-phase rotor U2, pin 10 of the drive chip U6 is connected to pin 2 of the V-phase rotor U2, pins 3, 7 and 8 of the V-phase rotor U2 are connected to pin 15 of the drive chip U6, and the V-phase rotor U2 is connected to pin 16 of the drive chip U6. The 5 and 6 pins are connected to the 12V battery voltage, the 13th pin of the driving chip U6 is connected to the 4th pin of the W-phase rotor U3, the 9th pin of the driving chip U6 is connected to the 2nd pin of the W-phase rotor U3, the 3rd, 7th and 8th pins of the W-phase rotor U3 are connected to the 12th pin of the driving chip U6, the 5 and 6 pins of the W-phase rotor U3 are connected to the 12V battery voltage, the 1st pin of the U-phase rotor U1, the 1st pin of the V-phase rotor U2 and the 1st pin of the W-phase rotor U3 are connected and connected to one end of the resistor R20, the other end of the resistor R20 is connected to the digital ground, one end of the resistor R28 is connected to one end of the resistor R20, and the other end of the resistor R28 is connected to the 8th pin of the main control MCU.

6. The brushless motor application circuit for automatic paint stripping of enameled wire according to claim 5, characterized in that: The three-phase electromotive force acquisition module includes resistors R5, R6 and R7. One end of resistor R5 is connected to pin 9 of the main control MCU, and the other end of resistor R5 is connected to pins 3, 7, and 8 of the W phase rotor. One end of resistor R6 is connected to pin 10 of the main control MCU, and the other end of resistor R6 is connected to pins 3, 7, and 8 of the V phase rotor. One end of resistor R7 is connected to pin 11 of the main control MCU, and the other end of resistor R7 is connected to pins 3, 7, and 8 of the U phase rotor. Pin 12 of the main control MCU is connected to one end of resistor R8, and the other end of resistor R8 is connected to a 12V voltage. One end of resistor R29 is connected to one end of resistor R8, and the other end of resistor R29 is connected to one end of capacitor C8, and the other end of capacitor C8 is connected to pin 12 of the main control MCU.

7. The brushless motor application circuit for automatic paint stripping of enameled wire according to claim 1, characterized in that: It also includes a switch debugger, wherein pin 5 of the switch debugger is connected to a 12V battery voltage, pin 1 of the switch debugger is connected to a 3.3V voltage, pin 2 of the switch debugger is connected to one end of a resistor R2, the other end of the resistor R2 is connected to pin 13 of a main control MCU, pin 3 of the switch debugger is connected to a digital ground, a capacitor C6 is provided between pins 2 and 3 of the switch debugger, and pin 4 of the switch debugger is connected to a 12V voltage.

8. The brushless motor application circuit for automatic paint stripping of enameled wire according to claim 1, characterized in that: It also includes a start-stop button, one end of which is connected to a 3.3V voltage, the other end of which is connected to one end of a resistor R4, and the other end of the resistor R4 is connected to pin 7 of the main control MCU.

9. A brushless motor application circuit for automatic paint stripping of enameled wire according to any one of claims 1 to 8, characterized in that: The model of the main control MCU is STM32G030F6P6.

Images