Control circuit of intelligent polishing pen with brushless motor

Abstract

The utility model provides a control circuit of a brushless motor intelligent polishing pen, which is characterized in that the output end of a power supply is connected with the input end of a power supply voltage regulating circuit, the output end of the power supply voltage regulating circuit is in power supply connection with an MCU (Microprogrammed Control Unit) main control circuit, and the input end of the MCU main control circuit is connected with the output end of an intelligent polishing pen information acquisition circuit; the input end of the MCU main control circuit is further connected with a speed regulation and reverse rotation control key, the output end of the MCU main control circuit is connected with the input end of the brushless motor drive circuit, and the output end of the brushless motor drive circuit is in drive connection with a brushless motor of the intelligent polishing pen. And the input end of the intelligent polishing pen information acquisition circuit is electrically connected with a brushless motor of the intelligent polishing pen. The intelligent polishing pen has the advantages that the performance of the intelligent polishing pen can be improved, the operation noise and maintenance frequency of the intelligent polishing pen are reduced, the operation stability of the intelligent polishing pen is improved, the service life of the intelligent polishing pen is prolonged, and the use safety of the intelligent polishing pen is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of control circuits, and particularly relates to a control circuit for a brushless motor intelligent grinding pen. Background Art

[0002] A grinding pen is a tool designed to repair and improve the surfaces of various materials. It is mainly applied to a variety of grinding occasions, including jade processing and grinding, mold surface processing and grinding, and various fine carving and grinding. At present, intelligent grinding pens on the market are generally pneumatic grinding pens or grinding pens driven by brushed motors, and both of these two types of grinding pens have multiple problems and defects:

[0003] 1. Large vibration amplitude: Traditional grinding pens generate relatively large vibrations during use, which not only affect the operation accuracy but also reduce the comfort of use.

[0004] 2. Loud noise: Brushed motor grinding pens and pneumatic grinding pens generate relatively large noises during operation, which not only deteriorate the working environment but also cause harm to the health of operators.

[0005] 3. Unstable performance: The performance of brushed motors will drop significantly after long-term operation, resulting in unstable grinding effects and thus affecting product quality.

[0006] 4. Electric spark interference: The electric sparks generated during the commutation of brushed motors may interfere with other electronic devices and affect the normal operation of other electronic devices.

[0007] 5. Frequent maintenance: Especially for pneumatic grinding pens, it is necessary to frequently clean the grinding pen, pipelines and air source regularly, which increases the use cost and operation complexity. Content of the Utility Model

[0008] To solve the problems in the prior art, the utility model provides a control circuit for a brushless motor intelligent grinding pen. By setting a power supply, a power voltage adjustment circuit, an MCU main control circuit, a brushless motor drive circuit and an intelligent grinding pen information acquisition circuit that cooperate with each other in the control circuit of the brushless motor intelligent grinding pen, the performance of the intelligent grinding pen can be significantly improved, the running noise and maintenance frequency of the intelligent grinding pen can be reduced, the running stability, service life and use safety of the intelligent grinding pen can be improved, and the problems that intelligent grinding pens in the prior art generally use pneumatic grinding pens or brushed motor drives with large noise, large vibration amplitude, unstable performance and frequent maintenance are solved.

[0009] The control circuit of a brushless motor intelligent grinding pen provided by the present utility model includes a power supply, a power voltage adjustment circuit, an MCU main control circuit, a brushless motor drive circuit, and an intelligent grinding pen information acquisition circuit. The output end of the power supply is connected to the input end of the power voltage adjustment circuit. The output end of the power voltage adjustment circuit is connected to the MCU main control circuit for power supply. The input end of the MCU main control circuit is connected to the output end of the intelligent grinding pen information acquisition circuit. The input end of the MCU main control circuit is also connected to a speed regulation and reverse control button. The output end of the MCU main control circuit is connected to the input end of the brushless motor drive circuit. The output end of the brushless motor drive circuit is connected to drive the brushless motor of the intelligent grinding pen. The input end of the intelligent grinding pen information acquisition circuit is electrically connected to the brushless motor of the intelligent grinding pen. The MCU main control circuit can automatically control the brushless motor drive circuit to drive the brushless motor of the intelligent grinding pen to operate according to the information fed back by the intelligent grinding pen information acquisition circuit and the information input by the speed regulation and reverse control button.

[0010] The present utility model is further improved. The MCU main control circuit is provided with a microprocessor U3 and a filter capacitor C10. Among them, the microprocessor U3 has 20 pins. The 4th pin of the microprocessor U3 is connected to one end of the filter capacitor C10 and the output end of the power voltage adjustment circuit. The 5th pin of the microprocessor U3 and the other end of the filter capacitor C10 are grounded. The 7th, 9th, 10th, and 11th pins of the microprocessor U3 are connected to the output end of the intelligent grinding pen information acquisition circuit. The 3rd and 13th pins of the microprocessor U3 are connected to the speed regulation and reverse control button. The 1st, 2nd, 8th, 14th, 15th, 16th, and 20th pins of the microprocessor U3 are connected to the input end of the brushless motor drive circuit.

[0011] The present utility model is further improved. The power voltage adjustment circuit is provided with a voltage adjustment chip U1, a voltage adjustment chip U2, a capacitor C3, a capacitor C7, and a capacitor C8. Among them, the voltage adjustment chip U1 has 3 pins, and the voltage adjustment chip U2 has 3 pins. The 1st pin of the voltage adjustment chip U1 is connected to one end of the capacitor C7 and the 2nd pin of the voltage adjustment chip U2. The 3rd pin of the voltage adjustment chip U1 is connected to the output end of the power supply. The 3rd pin of the voltage adjustment chip U2 is connected to one end of the capacitor C3, one end of the capacitor C8, and the MCU main control circuit. The other end of the capacitor C3, the other end of the capacitor C7, the other end of the capacitor C8, the 2nd pin of the voltage adjustment chip U1, and the 1st pin of the voltage adjustment chip U2 are grounded.

[0012] For further improvement of the present utility model, the brushless motor drive circuit is provided with a field effect transistor Q2, a field effect transistor Q5, a resistor R3 and a resistor R12. Among them, the gate of the field effect transistor Q2 is connected to the 14th pin of the microprocessor U3 through the resistor R3, the drain of the field effect transistor Q2 is connected to the output end of the power supply, the source of the field effect transistor Q2 is connected to the drain of the field effect transistor Q5 and the brushless motor of the intelligent grinding pen, the gate of the field effect transistor Q5 is connected to the 16th pin of the microprocessor U3 through the resistor R12, and the source of the field effect transistor Q5 is grounded.

[0013] For further improvement of the present utility model, the brushless motor drive circuit is further provided with a field effect transistor Q3, a field effect transistor Q6, a resistor R4, a resistor R13 and a resistor R21. Among them, the gate of the field effect transistor Q3 is connected to the 15th pin of the microprocessor U3 through the resistor R4, the drain of the field effect transistor Q3 is connected to the output end of the power supply, the source of the field effect transistor Q3 is connected to the drain of the field effect transistor Q6 and the brushless motor of the intelligent grinding pen, the gate of the field effect transistor Q6 is connected to the 2nd pin of the microprocessor U3 through the resistor R13, and the source of the field effect transistor Q6 is connected to the 8th pin of the microprocessor U3 through the resistor R21.

[0014] For further improvement of the present utility model, the brushless motor drive circuit is further provided with a field effect transistor Q4, a field effect transistor Q7, a resistor R5 and a resistor R15. Among them, the gate of the field effect transistor Q4 is connected to the 20th pin of the microprocessor U3 through the resistor R5, the drain of the field effect transistor Q4 is connected to the output end of the power supply, the source of the field effect transistor Q4 is connected to the drain of the field effect transistor Q7 and the brushless motor of the intelligent grinding pen, the gate of the field effect transistor Q7 is connected to the 1st pin of the microprocessor U3 through the resistor R15, and the source of the field effect transistor Q7 is grounded.

[0015] The present utility model is further improved. The information acquisition circuit of the intelligent grinding pen is provided with a resistor R27, a resistor R29, a capacitor 15, a resistor R24, a resistor R25 and a resistor R26. Among them, one end of the resistor R27 is connected to the output end of the power supply, and the other end of the resistor R27 is connected to one end of the resistor R29, one end of the capacitor 15 and the 7th pin of the microprocessor U3. One end of the resistor R24 is connected to the brushless motor of the intelligent grinding pen, and the other end of the resistor R24 is connected to the 9th pin of the microprocessor U3. One end of the resistor R25 is connected to the brushless motor of the intelligent grinding pen, and the other end of the resistor R25 is connected to the 10th pin of the microprocessor U3. One end of the resistor R26 is connected to the brushless motor of the intelligent grinding pen, and the other end of the resistor R26 is connected to the 11th pin of the microprocessor U3. The other end of the resistor R29 and the other end of the capacitor 15 are grounded.

[0016] The present utility model is further improved. The model of the microprocessor U3 is STM32G030F6P6.

[0017] The present utility model is further improved. The model of the voltage regulation chip U1 is CE6601A120PT, and the model of the voltage regulation chip U2 is DS8367-33A3.

[0018] The present utility model is further improved. The models of the field effect transistors Q2, Q5, Q3, Q6, Q4 and Q7 are all AP85N03NF.

[0019] Compared with the prior art, the beneficial effects of the present utility model are as follows: A control circuit for a brushless motor intelligent grinding pen is provided. By setting a power supply, a power voltage regulation circuit, an MCU main control circuit, a brushless motor drive circuit and an intelligent grinding pen information acquisition circuit that cooperate with each other in the control circuit of the brushless motor intelligent grinding pen, the MCU main control circuit can automatically control the brushless motor drive circuit to drive the brushless motor of the intelligent grinding pen to operate according to the information fed back by the intelligent grinding pen information acquisition circuit and the information input by the speed regulation and reverse control buttons, which can significantly improve the performance of the intelligent grinding pen, reduce the running noise and maintenance frequency of the intelligent grinding pen, improve the running stability, service life and use safety of the intelligent grinding pen, and solve the problems in the prior art that the intelligent grinding pen generally uses a pneumatic grinding pen or a brushed motor drive, resulting in large noise, large vibration amplitude, unstable performance and frequent maintenance. Description of the Drawings

[0020] To more clearly illustrate the solutions in the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0021] Figure 1 It is a schematic block diagram of the control circuit of a brushless motor intelligent grinding pen of the present utility model;

[0022] Figure 2 It is a circuit diagram of the MCU main control circuit of the present utility model;

[0023] Figure 3 It is a circuit diagram of the power supply voltage adjustment circuit of the present utility model;

[0024] Figure 4 It is a circuit diagram of the brushless motor drive circuit of the present utility model;

[0025] Figure 5 It is a circuit diagram of the intelligent grinding pen information acquisition circuit of the present utility model. Specific embodiments

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the description of the present application in the specification are only for the purpose of describing specific embodiments, and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description and claims of this application and the above accompanying drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the description and claims of this application or the above accompanying drawings are used to distinguish different objects, rather than to describe a specific order.

[0027] Referring to "embodiments" herein means that the specific features, structures, or characteristics described in connection with the embodiments may be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0028] In order to enable those skilled in the art of this technology to better understand the solutions of this application, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings.

[0029] Such as Figures 1-5As shown in the figure, a control circuit of a brushless motor intelligent grinding pen provided by the present utility model includes a power supply, a power voltage adjustment circuit, an MCU main control circuit, a brushless motor drive circuit, and an intelligent grinding pen information acquisition circuit. The output end of the power supply is connected to the input end of the power voltage adjustment circuit, the output end of the power voltage adjustment circuit is connected to the MCU main control circuit for power supply, the input end of the MCU main control circuit is connected to the output end of the intelligent grinding pen information acquisition circuit, the input end of the MCU main control circuit is also connected with a speed regulation and reverse control button, the output end of the MCU main control circuit is connected to the input end of the brushless motor drive circuit, the output end of the brushless motor drive circuit is connected to drive the brushless motor of the intelligent grinding pen, and the input end of the intelligent grinding pen information acquisition circuit is electrically connected to the brushless motor of the intelligent grinding pen. In this embodiment, the MCU main control circuit can automatically control the brushless motor drive circuit to drive the brushless motor of the intelligent grinding pen to operate according to the information fed back by the intelligent grinding pen information acquisition circuit and the information input by the speed regulation and reverse control button, which can significantly improve the performance of the intelligent grinding pen, reduce the running noise and maintenance frequency of the intelligent grinding pen, and improve the running stability, service life and use safety of the intelligent grinding pen.

[0030] As Figure 2 shown, the MCU main control circuit is provided with a microprocessor U3 and a filter capacitor C10. Among them, the model of the microprocessor U3 is STM32G030F6P6, the microprocessor U3 has 20 pins, the 4th pin of the microprocessor U3 is connected to one end of the filter capacitor C10 and the output end of the power voltage adjustment circuit, the 5th pin of the microprocessor U3 and the other end of the filter capacitor C10 are grounded, the 7th, 9th, 10th, and 11th pins of the microprocessor U3 are connected to the output end of the intelligent grinding pen information acquisition circuit, the 3rd and 13th pins of the microprocessor U3 are connected to the speed regulation and reverse control button, and the 1st, 2nd, 8th, 14th, 15th, 16th, and 20th pins of the microprocessor U3 are connected to the input end of the brushless motor drive circuit. In this embodiment, the MCU main control circuit is used to automatically control the brushless motor drive circuit to drive the brushless motor of the intelligent grinding pen to operate according to the information collected by the intelligent grinding pen information acquisition circuit and the information input by the speed regulation and reverse control button.

[0031] As Figure 3As shown in the figure, the power supply voltage adjustment circuit is provided with a voltage adjustment chip U1, a voltage adjustment chip U2, a capacitor C3, a capacitor C7 and a capacitor C8. Among them, the model of the voltage adjustment chip U1 is CE6601A120PT, and the model of the voltage adjustment chip U2 is DS8367-33A3. The voltage adjustment chip U1 has 3 pins, and the voltage adjustment chip U2 has 3 pins. The first pin of the voltage adjustment chip U1 is connected to one end of the capacitor C7 and the second pin of the voltage adjustment chip U2. The third pin of the voltage adjustment chip U1 is connected to the output end of the power supply. The third pin of the voltage adjustment chip U2 is connected to one end of the capacitor C3, one end of the capacitor C8 and the MCU main control circuit. The other end of the capacitor C3, the other end of the capacitor C7, the other end of the capacitor C8, the second pin of the voltage adjustment chip U1 and the first pin of the voltage adjustment chip U2 are grounded. In this embodiment, the power supply voltage adjustment circuit is used to supply power to the MCU main control circuit.

[0032] As Figure 4 shown in the figure, the brushless motor drive circuit is provided with a field effect transistor Q2, a field effect transistor Q5, a resistor R3 and a resistor R12. Among them, the gate of the field effect transistor Q2 is connected to the 14th pin of the microprocessor U3 through the resistor R3. The drain of the field effect transistor Q2 is connected to the output end of the power supply. The source of the field effect transistor Q2 is connected to the drain of the field effect transistor Q5 and the brushless motor of the intelligent grinding pen. The gate of the field effect transistor Q5 is connected to the 16th pin of the microprocessor U3 through the resistor R12. The source of the field effect transistor Q5 is grounded; the brushless motor drive circuit is also provided with a field effect transistor Q3, a field effect transistor Q6, a resistor R4, a resistor R13 and a resistor R21. Among them, the gate of the field effect transistor Q3 is connected to the 15th pin of the microprocessor U3 through the resistor R4. The drain of the field effect transistor Q3 is connected to the output end of the power supply. The source of the field effect transistor Q3 is connected to the drain of the field effect transistor Q6 and the brushless motor of the intelligent grinding pen. The gate of the field effect transistor Q6 is connected to the 2nd pin of the microprocessor U3 through the resistor R13. The source of the field effect transistor Q6 is connected to the 8th pin of the microprocessor U3 through the resistor R21; the brushless motor drive circuit is also provided with a field effect transistor Q4, a field effect transistor Q7, a resistor R5 and a resistor R15. Among them, the gate of the field effect transistor Q4 is connected to the 20th pin of the microprocessor U3 through the resistor R5. The drain of the field effect transistor Q4 is connected to the output end of the power supply. The source of the field effect transistor Q4 is connected to the drain of the field effect transistor Q7 and the brushless motor of the intelligent grinding pen. The gate of the field effect transistor Q7 is connected to the 1st pin of the microprocessor U3 through the resistor R15. The source of the field effect transistor Q7 is grounded; the models of the field effect transistors Q2, Q5, Q3, Q6, Q4 and Q7 are all AP85N03NF. In this embodiment, the brushless motor drive circuit is used to drive the brushless motor of the intelligent grinding pen to operate according to the control information of the MCU main control circuit.

[0033] As Figure 5 shown, the intelligent grinding pen information acquisition circuit is provided with a resistor R27, a resistor R29, a capacitor 15, a resistor R24, a resistor R25 and a resistor R26. Among them, one end of the resistor R27 is connected to the output end of the power supply, and the other end of the resistor R27 is connected to one end of the resistor R29, one end of the capacitor 15, and the 7th pin of the microprocessor U3. One end of the resistor R24 is connected to the brushless motor of the intelligent grinding pen, and the other end of the resistor R24 is connected to the 9th pin of the microprocessor U3. One end of the resistor R25 is connected to the brushless motor of the intelligent grinding pen, and the other end of the resistor R25 is connected to the 10th pin of the microprocessor U3. One end of the resistor R26 is connected to the brushless motor of the intelligent grinding pen, and the other end of the resistor R26 is connected to the 11th pin of the microprocessor U3. The other end of the resistor R29 and the other end of the capacitor 15 are grounded. In this embodiment, the intelligent grinding pen information acquisition circuit is used to feedback the rotational speed of the brushless motor, the voltage information of the intelligent grinding pen, and the current information of the intelligent grinding pen to the MCU main control circuit.

[0034] As can be seen from the above, the present invention provides a control circuit for a brushless motor intelligent grinding pen. By setting a power supply, a power supply voltage adjustment circuit, an MCU main control circuit, a brushless motor drive circuit, and an intelligent grinding pen information acquisition circuit that cooperate with each other in the control circuit of the brushless motor intelligent grinding pen, the MCU main control circuit can automatically control the brushless motor drive circuit to drive the brushless motor of the intelligent grinding pen to operate according to the information feedback by the intelligent grinding pen information acquisition circuit and the information input by the speed regulation and reverse control buttons. It can significantly improve the performance of the intelligent grinding pen, reduce the running noise and maintenance frequency of the intelligent grinding pen, and improve the running stability, service life, and use safety of the intelligent grinding pen, solving the problems of large noise, large vibration amplitude, unstable performance, and frequent maintenance of the intelligent grinding pen generally using a pneumatic grinding pen or a brushed motor drive in the prior art.

[0035] The above-mentioned specific implementation manner is the preferred implementation manner of the present invention, and does not limit the specific implementation scope of the present invention. The scope of the present invention includes but is not limited to this specific implementation manner. All equivalent changes made in accordance with the present invention are within the protection scope of the present invention.

Claims

1. A control circuit for a brushless motor intelligent grinding pen, characterized in that: The invention comprises a power supply, a power supply voltage adjustment circuit, an MCU main control circuit, a brushless motor drive circuit and an intelligent polishing pen information collection circuit, wherein the output end of the power supply is connected to the input end of the power supply voltage adjustment circuit, the output end of the power supply voltage adjustment circuit is connected to the MCU main control circuit for power supply, the input end of the MCU main control circuit is connected to the output end of the intelligent polishing pen information collection circuit, the input end of the MCU main control circuit is also connected to a speed regulation and reversing control button, the output end of the MCU main control circuit is connected to the input end of the brushless motor drive circuit, the output end of the brushless motor drive circuit is connected to the brushless motor drive of the intelligent polishing pen, the input end of the intelligent polishing pen information collection circuit is electrically connected to the brushless motor of the intelligent polishing pen, and the MCU main control circuit can automatically control the brushless motor drive circuit to drive the brushless motor of the intelligent polishing pen to operate according to the information fed back by the intelligent polishing pen information collection circuit and the information input by the speed regulation and reversing control button.

2. The control circuit of the brushless motor intelligent grinding pen according to claim 1 is characterized in that: The MCU main control circuit is provided with a microprocessor U3 and a filter capacitor C10, wherein the microprocessor U3 is provided with 20 pins, the 4th pin of the microprocessor U3 is connected to one end of the filter capacitor C10 and the output end of the power supply voltage adjustment circuit, the 5th pin of the microprocessor U3 and the other end of the filter capacitor C10 are grounded, the 7th, 9th, 10th and 11th pins of the microprocessor U3 are connected to the output end of the intelligent polishing pen information acquisition circuit, the 3rd and 13th pins of the microprocessor U3 are connected to the speed regulation and reverse control button, and the 1st, 2nd, 8th, 14th, 15th, 16th and 20th pins of the microprocessor U3 are connected to the input end of the brushless motor drive circuit.

3. The control circuit of the brushless motor intelligent grinding pen according to claim 2 is characterized in that: The power supply voltage adjustment circuit is provided with a voltage adjustment chip U1, a voltage adjustment chip U2, a capacitor C3, a capacitor C7 and a capacitor C8, wherein the voltage adjustment chip U1 is provided with 3 pins, and the voltage adjustment chip U2 is provided with 3 pins, the first pin of the voltage adjustment chip U1 is connected to one end of the capacitor C7 and the second pin of the voltage adjustment chip U2, the third pin of the voltage adjustment chip U1 is connected to the output end of the power supply, the third pin of the voltage adjustment chip U2 is connected to one end of the capacitor C3, one end of the capacitor C8 and the MCU main control circuit, and the other end of the capacitor C3, the other end of the capacitor C7, the other end of the capacitor C8, the second pin of the voltage adjustment chip U1 and the first pin of the voltage adjustment chip U2 are grounded.

4. The control circuit of the brushless motor intelligent grinding pen according to claim 3 is characterized in that: The brushless motor drive circuit is provided with a field effect tube Q2, a field effect tube Q5, a resistor R3 and a resistor R12, wherein the gate of the field effect tube Q2 is connected to the 14th pin of the microprocessor U3 through the resistor R3, the drain of the field effect tube Q2 is connected to the output end of the power supply, the source of the field effect tube Q2 is connected to the drain of the field effect tube Q5 and the brushless motor of the intelligent polishing pen, the gate of the field effect tube Q5 is connected to the 16th pin of the microprocessor U3 through the resistor R12, and the source of the field effect tube Q5 is grounded.

5. The control circuit of the brushless motor intelligent grinding pen according to claim 4 is characterized in that: The brushless motor drive circuit is also provided with a field effect tube Q3, a field effect tube Q6, a resistor R4, a resistor R13 and a resistor R21, wherein the gate of the field effect tube Q3 is connected to the 15th pin of the microprocessor U3 through the resistor R4, the drain of the field effect tube Q3 is connected to the output end of the power supply, the source of the field effect tube Q3 is connected to the drain of the field effect tube Q6 and the brushless motor of the intelligent polishing pen, the gate of the field effect tube Q6 is connected to the 2nd pin of the microprocessor U3 through the resistor R13, and the source of the field effect tube Q6 is connected to the 8th pin of the microprocessor U3 through the resistor R21.

6. The control circuit of the brushless motor intelligent grinding pen according to claim 5 is characterized in that: The brushless motor drive circuit is also provided with a field effect transistor Q4, a field effect transistor Q7, a resistor R5 and a resistor R15, wherein the gate of the field effect transistor Q4 is connected to the 20th pin of the microprocessor U3 through the resistor R5, the drain of the field effect transistor Q4 is connected to the output end of the power supply, the source of the field effect transistor Q4 is connected to the drain of the field effect transistor Q7 and the brushless motor of the intelligent polishing pen, the gate of the field effect transistor Q7 is connected to the 1st pin of the microprocessor U3 through the resistor R15, and the source of the field effect transistor Q7 is grounded.

7. The control circuit of the brushless motor intelligent grinding pen according to claim 6, characterized in that: The intelligent polishing pen information collection circuit is provided with a resistor R27, a resistor R29, a capacitor 15, a resistor R24, a resistor R25 and a resistor R26, wherein one end of the resistor R27 is connected to the output end of the power supply, the other end of the resistor R27 is connected to one end of the resistor R29, one end of the capacitor 15, and the 7th pin of the microprocessor U3, one end of the resistor R24 ​​is connected to the brushless motor of the intelligent polishing pen, the other end of the resistor R24 ​​is connected to the 9th pin of the microprocessor U3, one end of the resistor R25 is connected to the brushless motor of the intelligent polishing pen, the other end of the resistor R25 is connected to the 10th pin of the microprocessor U3, one end of the resistor R26 is connected to the brushless motor of the intelligent polishing pen, the other end of the resistor R26 is connected to the 11th pin of the microprocessor U3, and the other end of the resistor R29 and the other end of the capacitor 15 are grounded.

8. The control circuit of the brushless motor intelligent grinding pen according to claim 7, characterized in that: The model of the microprocessor U3 is STM32G030F6P6.

9. The control circuit of the brushless motor intelligent grinding pen according to claim 8, characterized in that: The model of the voltage regulating chip U1 is CE6601A120PT, and the model of the voltage regulating chip U2 is DS8367-33A3.

10. The control circuit of the brushless motor intelligent grinding pen according to claim 9, characterized in that: The models of the field effect transistor Q2, the field effect transistor Q5, the field effect transistor Q3, the field effect transistor Q6, the field effect transistor Q4, and the field effect transistor Q7 are all AP85N03NF.

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