Direct current motor service life test circuit

Abstract

The invention belongs to the technical field of motor service life testing, and particularly relates to a direct current motor service life testing circuit. According to the system, reverse connection prevention and overcurrent protection are achieved through the power input protection circuit, the reliability and safety of system operation are improved, the voltage reduction circuit is adopted for providing a stable direct-current power source, stable operation of the main control chip and a peripheral circuit is guaranteed, and the main control chip manages motor control, data processing and peripheral communication in a centralized mode; automatic and intelligent motor life testing is achieved, closed-loop control is formed by a temperature acquisition circuit and a cooling fan control circuit, motor overheating can be effectively prevented, the safety and accuracy of the testing process are improved, and the testing efficiency is improved through cooperative operation of multiple modules. Electrical parameters, temperature states and operation conditions of the direct current motor in the service life test process can be comprehensively monitored and recorded, visual display, remote transmission and alarm prompt are achieved, and the automation level, the safety and the practical value of the test are improved.

Description

Technical Field

[0001] This invention belongs to the field of motor life testing technology, and specifically relates to a DC motor life testing circuit. Background Technology

[0002] DC motors, as core components that convert electrical energy into mechanical energy, are widely used in numerous fields such as industrial automation, home appliances, automotive electronics, and medical devices due to their advantages of simple structure, convenient control, and reliable operation. The lifespan and reliability of a motor are key indicators for measuring its product quality, directly affecting the performance and lifespan of the entire machine. Therefore, conducting scientific and rigorous lifespan testing before the motor leaves the factory or during the new product development stage is of paramount importance for assessing its durability, identifying potential defects, and optimizing design parameters.

[0003] Traditional DC motor life testing technology has a low degree of automation, relies on manual operation and recording, resulting in low efficiency and a high risk of errors. Test data is incomplete, lacking real-time monitoring and closed-loop protection for key parameters such as speed and temperature. The system has poor reliability, insufficient power protection, weak data recording and traceability capabilities, and lacks accurate clocks and reliable storage. Furthermore, its functions are limited, lacking remote monitoring and user-friendly human-machine interaction, making it difficult to meet the needs of intelligent testing. Summary of the Invention

[0004] The purpose of this invention is to provide a DC motor life test circuit that can comprehensively ensure the safety and data integrity of the test process, thereby meeting the needs of DC motor life test.

[0005] The specific technical solution adopted by this invention is as follows: A DC motor life testing circuit includes: The main control chip circuit is used to control and process data during the motor life test process; The power input protection circuit is used to receive external power and provide reverse connection protection and overcurrent protection for the input power. The step-down circuit is connected to the power input protection circuit and the main control chip circuit, and is used to convert the voltage output by the power input protection circuit into DC voltage. Temperature acquisition circuit, which is connected to the main control chip circuit, is used to acquire temperature signals from the motor and the environment and transmit them to the main control chip circuit. The cooling fan control circuit is connected to the main control chip circuit and is used to drive the cooling fan and realize PWM speed regulation according to the signal of the temperature acquisition circuit. The clock circuit is connected to the main control chip circuit and is used to provide accurate timing for the motor life test process, and to maintain timing by relying on a backup battery in the event of a power failure. The storage circuit is connected to the main control chip circuit and is used to store temperature data and operating status data generated during motor testing. The wireless communication circuit is connected to the main control chip circuit and is used to send the temperature data and operating status data in the storage circuit to the external terminal device via Bluetooth. The DC motor control and speed detection circuit is connected to the main control chip circuit and is used to control the forward and reverse rotation and speed regulation of the DC motor, and to detect the motor speed and direction.

[0006] In a preferred embodiment, the main control chip circuit includes chip U2, crystal oscillator U1, capacitors C1 and C5, resistor R5, capacitor C6, switch SW3, capacitors C7, C11, C2, C8, resistors R6 and R7. Pin 1 of chip U2 is connected to 3.3V DC. Pin 5 of chip U2 is connected to one end of crystal oscillator U1 and one end of capacitor C1. Pin 6 of chip U2 is connected to the other end of crystal oscillator U1 and one end of capacitor C5. The other end of capacitor C1 is connected to the other end of capacitor C5 and grounded. Pin 7 of chip U2 is connected to one end of resistor R5, one end of capacitor C6, and one end of switch SW3. The other end of resistor R5 is connected to 3.3V DC, and the other end of capacitor C6 is connected to switch SW3. The other end of 3 is connected to ground. Pin 8 of chip U2 is connected to one end of capacitor C7, one end of capacitor C11, and pin 23 and grounded. Pin 9 of chip U2 is connected to the other end of capacitor C7. Pin 24 of chip U2 is connected to the other end of capacitor C11. Pin 48 of chip U2 is connected to one end of capacitor C2. Pin 47 of chip U2 is connected to the other end of capacitor C2, pin 44, pin 37, one end of capacitor C8, and pin 35 and grounded. Pin 36 of chip U2 is connected to the other end of capacitor C8. Pin 30 of chip U2 is connected to one end of resistor R6. Pin 29 of chip U2 is connected to one end of resistor R7. The other end of resistor R6 is connected to the other end of resistor R7 and connected to DC 3.3V.

[0007] In a preferred embodiment, the power input protection circuit includes a chip U3, a capacitor C3, a switch SW2, a transistor Q1, a capacitor C4, and a resettable fuse F1. Pin 1 of chip U3 is connected to one end of capacitor C3, one end of switch SW2, and pin 1 of transistor Q1. The other end of switch SW2 is connected to the power supply. Pins 2 and 3 of chip U3, the other end of capacitor C3, and one end of resettable fuse F1 are connected and grounded. The other end of resettable fuse F1 is grounded. Pin 5 of chip U3 is connected to pin 3 of transistor Q1. Pin 6 of chip U3 is connected to one end of capacitor C4, and the other end of capacitor C4 is connected to pin 2 of transistor Q1.

[0008] In a preferred embodiment, the step-down circuit includes chip U4, capacitors C10 and C9, a Schottky diode D1, an inductor L1, capacitors C12 and C13, chip U5, a Schottky diode D2, an inductor L2, capacitor C19, and capacitor C20. Pin 1 of chip U4 is connected to one end of capacitor C10, one end of capacitor C9, the other end of capacitor C4, and pin 1 of chip U5. The other end of capacitor C10 is connected to the other end of capacitor C9 and grounded. Pin 2 of chip U4 is connected to one end of Schottky diode D1 and one end of inductor L1. Pins 3 and 5 of chip U4, and the Schottky diode... The other end of D1, one end of capacitor C12, one end of capacitor C13, pin 6, pin 3 of chip U5, pin 5 of chip U5, one end of Schottky diode D2, one end of capacitor C19, one end of capacitor C20, and pin 6 of chip U5 are connected and grounded. Pin 4 of chip U4 is connected to the other end of inductor L1, the other end of capacitor C12, and the other end of capacitor C13. Pin 2 of chip U5 is connected to the other end of Schottky diode D2 and one end of Schottky diode D2. Pin 4 of chip U5 is connected to the other end of inductor L2, the other end of capacitor C19, and the other end of capacitor C20.

[0009] In a preferred embodiment, the temperature acquisition circuit includes resistors R11, R13, R16, and R18, NTC thermistors R12, R14, R17, and R19. One end of resistor R11 is connected to one end of resistors R13, R16, and R18 and grounded. The other end of resistor R11 is connected to one end of NTC thermistor R12 and pin 17 of chip U2. The other end of resistor R13... Connect one end of NTC thermistor R14 to pin 16 of chip U2. Connect the other end of resistor R16 to one end of NTC thermistor R17 and pin 15 of chip U2. Connect the other end of resistor R18 to one end of NTC thermistor R19 and pin 14 of chip U2. Connect the other end of NTC thermistor R12 to the other ends of NTC thermistors R14, R17, and R19 and connect to DC 3.3V.

[0010] In a preferred embodiment, the cooling fan control circuit includes chip U9, fan M1, capacitors C24, C26, and C27. Pins 1 and 2 of chip U9 and the FAN+ pin of fan M1 are connected. Pins 3, 4, 9, and 10 of chip U9 are connected and grounded. Pins 5 and 6 of chip U9 and the FAN- pin of fan M1 are connected. Pins 13, 14, and 24 of chip U9, one end of capacitor C26, and one end of capacitor C27 are connected and connected to DC 5V. The other end of capacitor C26 and capacitor C27 are grounded. Pins 18 and 22 of chip U9 are connected and grounded. Pins 19, 20, and 21 of chip U9 and one end of capacitor C24 are connected and connected to DC 3.3V. The other end of capacitor C24 is grounded. Pin 23 of chip U9 is connected to pin 33 of chip U2.

[0011] In a preferred embodiment, the clock circuit includes a chip U6, a capacitor C16, and a battery U7. Pin 2 of chip U6 is connected to one end of capacitor C16 and connected to DC 3.3V. Pin 5 of chip U6 is connected to the other end of capacitor C16 and grounded. Pin 6 of chip U6 is connected to the positive terminal of battery U7, and the negative terminal of battery U7 is grounded. Pin 7 of chip U6 is connected to pin 29 of chip U2, and pin 8 of chip U6 is connected to pin 30 of chip U2.

[0012] In a preferred embodiment, the storage circuit includes a chip U10 and a capacitor C25. Pin 1 of chip U10 is connected to pin 25 of chip U2, pin 2 of chip U10 is connected to pin 27 of chip U2, pin 3 of chip U10 is connected to pins 7 and 8 and one end of capacitor C25 and connected to DC 3.3V, pin 4 of chip U10 is connected to the other end of capacitor C25 and grounded, pin 5 of chip U10 is connected to pin 28 of chip U2, and pin 6 of chip U10 is connected to pin 26 of chip U2.

[0013] In a preferred embodiment, the wireless communication circuit includes chip U13, resistor R1, switch SW1, resistors R2, R3, and R4, and light-emitting diode LED1. Pin 1 of chip U13 is connected to pin 13 of chip U2, pin 2 of chip U13 is connected to pin 12 of chip U2, pin 12 of chip U13 is connected to DC 3.3V, pins 13, 21, and 22 of chip U13 are all grounded, pin 31 of chip U13 is connected to one end of resistor R4, the other end of resistor R4 is connected to one end of light-emitting diode LED1, the other end of light-emitting diode LED1 is grounded, pin 32 of chip U13 is connected to one end of resistor R3, the other end of resistor R3 is connected to pin 21 of chip U2, pin 34 of chip U13 is connected to one end of resistor R1 and one end of resistor R2, the other end of resistor R1 is connected to one end of switch SW1, the other end of switch SW1 is connected to DC 3.3V, and the other end of resistor R2 is grounded.

[0014] In a preferred embodiment, the DC motor control and speed detection circuit includes a motor controller U12 and a Hall encoder U11. Pin 1 of the motor controller U12 is connected to pin 18 of the chip U2. Pins 2 and 4 of the motor controller U12 are connected and grounded. Pin 3 of the motor controller U12 is connected to pin 19 of the chip U2. Pin 5 of the motor controller U12 is connected to the other end of the capacitor C4. Pin 6 of the motor controller U12 is grounded. Pin 7 of the motor controller U12 is connected to pin 5 of the Hall encoder U11. Pin 8 of the motor controller U12 is connected to pin 6 of the Hall encoder U11. Pin 1 of the Hall encoder U11 is connected to 3.3V DC. Pin 2 of the Hall encoder U11 is grounded. Pin 3 of the Hall encoder U11 is connected to pin 10 of the chip U2. Pin 4 of the Hall encoder U11 is connected to pin 11 of the chip U2.

[0015] The technical effects achieved by this invention are as follows: This invention provides reverse connection and overcurrent protection through a power input protection circuit, improving the reliability and safety of system operation. A step-down circuit provides a stable DC power supply, ensuring the stable operation of the main control chip and peripheral circuits. The main control chip centrally manages motor control, data processing, and peripheral communication, achieving automation and intelligence in motor life testing. A temperature acquisition circuit and a cooling fan control circuit form a closed-loop control, effectively preventing motor overheating and improving the safety and accuracy of the testing process. A clock circuit provides high-precision time recording and continues to keep time even when power is off, ensuring the time reliability of life test results. The storage circuit supports long-term data retention and integrates with wireless communication... The communication circuit enables remote data transmission, facilitating real-time acquisition and subsequent analysis of test data. The motor control and speed detection circuit enables multi-dimensional testing of the motor, ensuring the comprehensiveness and accuracy of life testing. The display drive circuit visualizes the motor test parameters and operating status, allowing users to intuitively understand the motor life testing process. The input button acquisition circuit provides a simple and effective human-machine interaction method, enabling users to flexibly input control commands and improving the convenience and flexibility of system operation. The buzzer drive circuit provides acoustic prompts and alarms during testing, ensuring that users receive timely feedback when there are abnormalities or when the test is completed, thus improving the system's safety and ease of use. This invention, through the coordinated operation of multiple modules, can comprehensively monitor and record the electrical parameters, temperature status, and operating conditions of DC motors during life testing, and realize visual display, remote transmission, and alarm prompts, thereby improving the automation level, safety, and practical value of the test. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main control chip circuit provided by the present invention; Figure 2 This is a schematic diagram of the power input protection circuit provided by the present invention; Figure 3 This is a schematic diagram of the step-down circuit provided by the present invention; Figure 4 This is a schematic diagram of the temperature acquisition circuit provided by the present invention; Figure 5 This is a schematic diagram of the cooling fan control circuit provided by the present invention; Figure 6 This is a schematic diagram of the clock circuit provided by the present invention; Figure 7 This is a schematic diagram of the storage circuit provided by the present invention; Figure 8 This is a schematic diagram of the wireless communication circuit provided by the present invention; Figure 9 This is a schematic diagram of the DC motor control and speed detection circuit provided by the present invention; Figure 10 This is a schematic diagram of the display driving circuit provided by the present invention; Figure 11 This is a schematic diagram of the input button acquisition circuit provided by the present invention; Figure 12 This is a schematic diagram of the buzzer drive circuit provided by the present invention. Detailed Implementation

[0017] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0018] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0019] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in a preferred embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that mutually excludes other embodiments.

[0020] Furthermore, the present invention will be described in detail with reference to the schematic diagrams. When describing the embodiments of the present invention in detail, the schematic diagrams are merely examples for ease of explanation and should not limit the scope of protection of the present invention.

[0021] Please see the appendix Figures 1 to 12 As shown, a DC motor life test circuit is provided, including: The main control chip circuit is used to control and process data during the motor life test process; The power input protection circuit is used to receive external power and provide reverse connection protection and overcurrent protection for the input power. The step-down circuit is connected to the power input protection circuit and the main control chip circuit, and is used to convert the voltage output by the power input protection circuit into DC voltage. Temperature acquisition circuit, which is connected to the main control chip circuit, is used to acquire temperature signals from the motor and the environment and transmit them to the main control chip circuit. The cooling fan control circuit is connected to the main control chip circuit and is used to drive the cooling fan and realize PWM speed regulation according to the signal of the temperature acquisition circuit. The clock circuit is connected to the main control chip circuit and is used to provide accurate timing for the motor life test process, and to maintain timing by relying on a backup battery in the event of a power failure. The storage circuit is connected to the main control chip circuit and is used to store temperature data and operating status data generated during motor testing. The wireless communication circuit is connected to the main control chip circuit and is used to send the temperature data and operating status data in the storage circuit to the external terminal device via Bluetooth. The DC motor control and speed detection circuit is connected to the main control chip circuit and is used to control the forward and reverse rotation and speed regulation of the DC motor, and to detect the motor speed and direction.

[0022] It should be noted that the circuit also includes a display driver circuit, an input button acquisition circuit, and a buzzer driver circuit, all of which are connected to the main control chip circuit. The display driver circuit is used to display the motor test parameters and operating status, the input button acquisition circuit is used for manual input of test commands, and the buzzer driver circuit is used to provide prompts or alarms during the test.

[0023] As described above, during operation, the external power supply first enters the power input protection circuit, where reverse connection protection and overcurrent protection modules ensure a safe and stable power supply to the system. Subsequently, the voltage is converted into a stable DC voltage by a step-down circuit to provide operating power to the main control chip circuit and other functional modules. The main control chip, as the core control unit, controls the DC motor control and speed detection circuit according to a preset program, realizing forward and reverse rotation and PWM speed regulation of the motor. It also acquires real-time motor speed and direction information through the speed detection interface. Furthermore, the main control chip receives motor and ambient temperature signals from the temperature acquisition circuit and drives the cooling fan control circuit based on temperature changes, thereby achieving self-regulation during motor operation. Dynamic heat dissipation and temperature regulation are implemented. The clock circuit provides a precise time reference for the main control chip, allowing it to maintain timekeeping even during power outages using a backup battery, ensuring the accuracy of data recording during lifespan testing. The main control chip stores collected temperature, speed, and operating status data through a storage circuit, ensuring complete preservation of long-term test data. Simultaneously, the main control chip can transmit data in real-time to external terminal devices via a wireless communication circuit, facilitating remote monitoring and management. A power input protection circuit provides reverse connection and overcurrent protection, improving the reliability and safety of system operation. A step-down circuit provides a stable DC power supply, ensuring stable operation of the main control chip and peripheral circuits. This integrated circuit manages motor control, data processing, and peripheral communication, enabling automated and intelligent motor life testing. The temperature acquisition circuit and cooling fan control circuit form a closed-loop control system, effectively preventing motor overheating and improving the safety and accuracy of the testing process. The clock circuit provides high-precision time recording and continues to keep time even when power is off, ensuring the time reliability of life test results. The storage circuit supports long-term data retention and, combined with the wireless communication circuit, enables remote data transmission, facilitating real-time acquisition and subsequent analysis of test data. The motor control and speed detection circuits enable multi-dimensional testing of the motor, ensuring the comprehensiveness and accuracy of life testing. The display and drive circuit displays motor test parameters and... The visualization of the operating status allows users to intuitively grasp the motor life test process. The input button acquisition circuit provides a simple and effective human-machine interaction method, enabling users to flexibly input control commands and improving the convenience and flexibility of system operation. The buzzer drive circuit can provide acoustic prompts and alarms during the test, ensuring that users can receive timely feedback when there are abnormalities or when the test is completed, thus improving the system's safety and ease of use. Through the coordinated operation of multiple modules, the electrical parameters, temperature status, and operating conditions of the DC motor during the life test process can be comprehensively monitored and recorded, and visualization, remote transmission, and alarm prompts can be achieved, improving the automation level, safety, and practical value of the test.

[0024] In a preferred embodiment, the main control chip circuit includes chip U2, crystal oscillator U1, capacitors C1 and C5, resistors R5 and C6, switch SW3, capacitors C7, C11, C2, C8, resistors R6 and R7. Pin 1 of chip U2 is connected to 3.3V DC. Pin 5 of chip U2 is connected to one end of crystal oscillator U1 and one end of capacitor C1. Pin 6 of chip U2 is connected to the other end of crystal oscillator U1 and one end of capacitor C5. The other end of capacitor C1 is connected to the other end of capacitor C5 and grounded. Pin 7 of chip U2 is connected to one end of resistor R5, one end of capacitor C6, and one end of switch SW3. The other end of resistor R5 is connected to 3.3V DC, and the other end of capacitor C6 is connected to switch SW3. The other end of W3 is connected to ground. Pin 8 of chip U2 is connected to one end of capacitor C7, one end of capacitor C11, and pin 23 and grounded. Pin 9 of chip U2 is connected to the other end of capacitor C7. Pin 24 of chip U2 is connected to the other end of capacitor C11. Pin 48 of chip U2 is connected to one end of capacitor C2. Pin 47 of chip U2 is connected to the other end of capacitor C2, pin 44, pin 37, one end of capacitor C8, and pin 35 and grounded. Pin 36 of chip U2 is connected to the other end of capacitor C8. Pin 30 of chip U2 is connected to one end of resistor R6. Pin 29 of chip U2 is connected to one end of resistor R7. The other end of resistor R6 is connected to the other end of resistor R7 and connected to DC 3.3V.

[0025] The crystal oscillator circuit, consisting of crystal oscillator U1, capacitors C1 and C5, and chip U2, provides a stable clock signal for chip U2, ensuring the accuracy and stability of the system operation. Upon power-up, capacitor C6 is short-circuited to ground, keeping the reset pin low and triggering chip reset. When capacitor C6 is fully charged, it becomes open-circuited, and the reset pin is pulled high by resistor R5, resuming chip operation. Users can also manually reset the chip by pressing SW3. Multiple power supply pins of chip U2 (such as pins 9, 24, 36, and 48) are connected to decoupling capacitors (C2, C7, C8, and C11). These capacitors provide filtering and energy buffering through grounding, ensuring the stability of chip U2's power supply and reducing the impact of power supply noise on chip U2's operation. Pins 30 and 29 of chip U2 are connected to a 3.3V power supply through resistors R6 and R7, respectively, for SCL and SDA. Pull-up resistors on the signal lines enable I2C bus communication, ensuring stable communication between the main control chip and peripherals such as the display and clock chip. A clock circuit consisting of a crystal oscillator and capacitors provides a high-precision clock signal to the chip, ensuring stable operation of the main control circuit and accurate data processing. A reset circuit is included, which can automatically reset upon power-on or manually reset via a button, improving system reliability and maintainability. Multiple decoupling capacitors are distributed near different power supply pins of the chip, effectively filtering out power supply noise and preventing voltage fluctuations from interfering with chip operation, thus improving the circuit's anti-interference capability and stability. Pull-up resistors are configured on the I2C interface pins to ensure the stability of the logic level of bus communication and the reliability of data transmission. The entire main control chip circuit structure is reasonable, ensuring the stable operation of the core control chip and providing a reliable operating foundation for subsequent temperature acquisition, storage, display, and communication modules.

[0026] In a preferred embodiment, the power input protection circuit includes a chip U3, a capacitor C3, a switch SW2, a transistor Q1, a capacitor C4, and a resettable fuse F1. Pin 1 of chip U3 is connected to one end of capacitor C3, one end of switch SW2, and pin 1 of transistor Q1. The other end of switch SW2 is connected to the power supply. Pins 2 and 3 of chip U3, the other end of capacitor C3, and one end of resettable fuse F1 are connected and grounded. The other end of resettable fuse F1 is grounded. Pin 5 of chip U3 is connected to pin 3 of transistor Q1. Pin 6 of chip U3 is connected to one end of capacitor C4, and the other end of capacitor C4 is connected to pin 2 of transistor Q1.

[0027] As described above, when the external power supply is connected via switch SW2, the power first passes through the detection and control unit composed of chip U3 and capacitor C3. Chip U3 uses the power voltage signal provided by capacitor C3 to output a control signal on pin 5 through its internal control logic, driving the gate of transistor Q1 and thus determining the conduction state of Q1. If the power supply is connected correctly, capacitor C3 can charge normally, chip U3 outputs a valid control signal, making transistor Q1 conduct, and the current can smoothly enter the subsequent circuit. If the power supply is connected in reverse, capacitor C3 cannot charge normally, chip U3 does not output a valid signal, transistor Q1 remains off, and the circuit is disconnected, thus achieving reverse connection protection. At the same time, a self-resetting fuse F1 is connected in series in the input circuit. When the circuit experiences excessive current due to motor stall or abnormal load, F1's resistance increases due to heat, automatically disconnecting the circuit and cutting off the power supply, achieving overcurrent protection. After the fault is eliminated and the temperature drops, F1 can automatically resume conduction, and the circuit returns to normal operation. Capacitor C4 is connected to transistor Q1 for voltage stabilization and filtering, ensuring smooth circuit operation during transistor switching. The ideal diode scheme constructed by chip U3 and transistor Q1 achieves reverse connection protection. The on-resistance is much lower than that of traditional diodes, reducing energy loss and improving power supply efficiency. The introduction of capacitors C3 and C4 ensures the stability and anti-interference of the input power supply, making the power switching process smoother. The self-resetting fuse F1 provides overcurrent protection, which can disconnect in time when abnormal current occurs to avoid damage to the circuit and motor. It can also automatically recover after the fault is eliminated, reducing maintenance costs. Through the reverse connection protection and overcurrent protection mechanism, the reliability and safety of the entire DC motor life test circuit are effectively improved, ensuring stable operation during long-term continuous testing.

[0028] In a preferred embodiment, the step-down circuit includes chip U4, capacitors C10 and C9, a Schottky diode D1, an inductor L1, capacitors C12 and C13, chip U5, a Schottky diode D2, an inductor L2, capacitor C19, and capacitor C20. Pin 1 of chip U4 is connected to one end of capacitor C10, one end of capacitor C9, the other end of capacitor C4, and pin 1 of chip U5. The other end of capacitor C10 is connected to the other end of capacitor C9 and grounded. Pin 2 of chip U4 is connected to one end of Schottky diode D1 and one end of inductor L1. Pins 3 and 5 of chip U4 are connected to the Schottky diode... The other end of transistor D1, one end of capacitor C12, one end of capacitor C13, pin 6, pin 3 of chip U5, pin 5 of chip U5, one end of Schottky diode D2, one end of capacitor C19, one end of capacitor C20, and pin 6 of chip U5 are connected and grounded. Pin 4 of chip U4 is connected to the other end of inductor L1, the other end of capacitor C12, and the other end of capacitor C13. Pin 2 of chip U5 is connected to the other end of Schottky diode D2 and one end of Schottky diode D2. Pin 4 of chip U5 is connected to the other end of inductor L2, the other end of capacitor C19, and the other end of capacitor C20.

[0029] As described above, when the power input protection circuit outputs voltage to chips U4 and U5, in the 3.3V output channel, chip U4 controls the PWM switching signal through its pin 2, driving the energy storage and freewheeling circuit formed by inductor L1 and Schottky diode D1. Inductor L1 stores energy when the switch is on and releases energy when it is off. After being filtered by capacitors C12 and C13, a stable 3.3V DC voltage is output to supply the main control chip and related modules. In the 5V output channel, chip U5 operates on the same principle. Its pin 2, together with the LC filter structure formed by Schottky diode D2 and inductor L2, achieves voltage smoothing. The output terminal obtains a stable 5V DC voltage after being filtered by capacitors C19 and C20, which is used to drive the fan. For modules with high power requirements, such as those displaying the main unit, capacitors C9 and C10 serve as input filters and decoupling components, respectively, to ensure the stability of the chip's input power supply and reduce power ripple and transient interference. A PWM control combined with an LC filter structure ensures low ripple and high stability in the output voltage, guaranteeing reliable operation of different modules. Two separate 3.3V and 5V step-down circuits meet the power supply needs of different devices, including the main control chip, sensors, communication modules, and displays, improving system compatibility. Schottky diodes are used as freewheeling devices, offering low forward voltage drop and fast switching speed, reducing energy loss and improving power conversion efficiency. Filter capacitors are configured at both the input and output terminals to effectively suppress electromagnetic interference and power supply noise, enhancing the circuit's anti-interference capability.

[0030] In a preferred embodiment, the temperature acquisition circuit includes resistors R11, R13, R16, R18, NTC thermistors R12, R14, R17, and R19. One end of resistor R11 is connected to one end of resistors R13, R16, and R18 and grounded. The other end of resistor R11 is connected to one end of NTC thermistor R12 and pin 17 of chip U2. The other end of resistor R13... One end of resistor R16 is connected to one end of NTC thermistor R14 and pin 16 of chip U2. The other end of resistor R16 is connected to one end of NTC thermistor R17 and pin 15 of chip U2. The other end of resistor R18 is connected to one end of NTC thermistor R19 and pin 14 of chip U2. The other end of NTC thermistor R12 is connected to the other ends of NTC thermistors R14, R17, and R19 and connected to DC 3.3V.

[0031] In each circuit described above, a fixed resistor (e.g., R11) is connected in series with a thermistor (e.g., R12), and the midpoint voltage is connected to the analog input pin of the main control chip. When the temperature changes, the resistance of the thermistor changes accordingly, causing the midpoint voltage to change. The main control chip samples this voltage value and, combined with the known voltage divider resistor values ​​and the temperature characteristic curve of the thermistor, calculates the corresponding temperature. The four circuits respectively collect temperature signals from different positions of the motor or the environment, thereby realizing multi-point temperature monitoring. The voltage divider circuit structure is simple, low-cost, and easy to implement multi-channel temperature acquisition. Through the thermistor's sensitivity to temperature changes, the temperature status of the motor and the environment can be reflected in real time with fast response speed. The multi-channel independent acquisition design realizes temperature monitoring of different parts of the motor and the surrounding environment, improving the comprehensiveness and accuracy of test results. It can form a closed-loop regulation mechanism with the cooling fan control circuit to ensure the safe and stable operation of the motor during the life test.

[0032] In a preferred embodiment, the cooling fan control circuit includes chip U9, fan M1, capacitors C24, C26, and C27. Pins 1 and 2 of chip U9 and the FAN+ pin of fan M1 are connected. Pins 3, 4, 9, and 10 of chip U9 are connected and grounded. Pins 5 and 6 of chip U9 and the FAN- pin of fan M1 are connected. Pins 13, 14, and 24 of chip U9, one end of capacitor C26, and one end of capacitor C27 are connected and connected to DC 5V. The other end of capacitor C26 and capacitor C27 are grounded. Pins 18 and 22 of chip U9 are connected and grounded. Pins 19, 20, and 21 of chip U9 and one end of capacitor C24 are connected and connected to DC 3.3V. The other end of capacitor C24 is grounded. Pin 23 of chip U9 is connected to pin 33 of chip U2.

[0033] As described above, chip U9, as a small DC motor driver chip, has pins 13, 14, and 24 connected to a 5V drive power supply to provide operating voltage for the fan. Pins 19, 20, and 21 are connected to a 3.3V logic power supply for internal control logic, ensuring level compatibility. Pin 23 is connected to pin 33 (FAN control pin) of the main control chip U2. When chip U2 outputs a high-level signal to pin 23 of chip U9, the internal drive circuit of chip U9 is activated, and fan M1 is powered on and runs. When chip U2 outputs a low-level signal, chip U9 stops outputting, and the fan stops rotating. Chip U2 can... A PWM signal is output to pin 23 to achieve stepless speed regulation of the fan. Combined with temperature acquisition circuit feedback, the main controller can dynamically adjust the fan speed to achieve intelligent temperature control and heat dissipation. Capacitors C24, C26, and C27 are decoupling capacitors used to filter out high-frequency noise in the 3.3V and 5V power supplies, respectively, to ensure stable operation of U9. It supports PWM speed regulation and can automatically adjust the fan speed according to the real-time temperature during motor testing to improve heat dissipation efficiency and extend equipment life. The 3.3V logic power supply and 5V drive power supply are designed separately to avoid interference from the drive section to the control signal and improve system stability.

[0034] In a preferred embodiment, the clock circuit includes a chip U6, a capacitor C16, and a battery U7. Pin 2 of chip U6 is connected to one end of capacitor C16 and connected to DC 3.3V. Pin 5 of chip U6 is connected to the other end of capacitor C16 and grounded. Pin 6 of chip U6 is connected to the positive terminal of battery U7, and the negative terminal of battery U7 is grounded. Pin 7 of chip U6 is connected to pin 29 of chip U2, and pin 8 of chip U6 is connected to pin 30 of chip U2.

[0035] As described above, pins 7 (SDA) and 8 (SCL) of chip U6 are connected to pins 29 and 30 of the main control chip U2, respectively, forming an I2C communication bus. The main control chip U2 reads the current time from chip U6 through the I2C bus for system time recording. It can also write time to chip U6 for initialization or calibration, ensuring that the time base of the entire system is unified and accurate. When the system is working normally, chip U6 is powered by the main 3.3V power supply, which also charges the backup battery U7. When the main power supply of the entire system is disconnected, chip U6 automatically switches to power supply by the backup battery U7, thereby ensuring that the clock chip continues to run without losing time information and realizing timekeeping even when power is off. Capacitor C16 is used as a decoupling capacitor and is connected in parallel to the power supply pin of chip U6 to filter out high-frequency noise on the power line, providing a clean and stable operating voltage for the clock chip and further ensuring timing accuracy.

[0036] In a preferred embodiment, the storage circuit includes a chip U10 and a capacitor C25. Pin 1 of chip U10 is connected to pin 25 of chip U2, pin 2 of chip U10 is connected to pin 27 of chip U2, pin 3 of chip U10 is connected to pins 7 and 8 and one end of capacitor C25 and connected to DC 3.3V, pin 4 of chip U10 is connected to the other end of capacitor C25 and grounded, pin 5 of chip U10 is connected to pin 28 of chip U2, and pin 6 of chip U10 is connected to pin 26 of chip U2.

[0037] As described above, the chip is connected to the main control chip U2 via a standard 4-wire SPI bus. Pin 1 of chip U10 and pin 25 of chip U2 are chip select signals. The main control chip selects and initiates communication with the memory chip by pulling this pin low. Pin 2 of chip U10 and pin 27 of chip U2 are main control inputs and memory chip outputs, used by the main control chip to read data from the memory. Pin 5 of chip U10 and pin 28 of chip U2 are main control outputs and memory chip inputs, used by the main control chip to write data to the memory. Pin 6 of chip U10 and pin 26 of chip U2 are serial clock signals, provided by the main control chip, used to synchronize each bit of data in the SPI communication. This serial communication method is fast, has a simple interface, and occupies few main control I / O resources. Pins 3, 7, and 8 of chip U10 are connected to a 3.3V DC power supply to ensure normal operation of the chip. Capacitor C25 is used as a decoupling capacitor to effectively filter out high-frequency noise and transient interference on the power line, providing a clean and stable voltage for the memory chip and preventing data errors or loss due to voltage fluctuations during read and write operations.

[0038] In a preferred embodiment, the wireless communication circuit includes chip U13, resistor R1, switch SW1, resistors R2, R3, and R4, and light-emitting diode LED1. Pin 1 of chip U13 is connected to pin 13 of chip U2, pin 2 of chip U13 is connected to pin 12 of chip U2, pin 12 of chip U13 is connected to DC 3.3V, pins 13, 21, and 22 of chip U13 are all grounded, pin 31 of chip U13 is connected to one end of resistor R4, the other end of resistor R4 is connected to one end of light-emitting diode LED1, the other end of light-emitting diode LED1 is grounded, pin 32 of chip U13 is connected to one end of resistor R3, the other end of resistor R3 is connected to pin 21 of chip U2, pin 34 of chip U13 is connected to one end of resistor R1 and one end of resistor R2, the other end of resistor R1 is connected to one end of switch SW1, the other end of switch SW1 is connected to DC 3.3V, and the other end of resistor R2 is grounded.

[0039] As mentioned above, chip U13 (such as the HC-08 Bluetooth module) is the core of the circuit, responsible for wireless data transmission and reception. The main control chip U2 transmits data via a serial port (UART). Pin 1 of chip U13 and pin 13 of chip U2 receive data from the main control chip, while pin 2 of chip U13 and pin 12 of chip U2 send data to the main control chip. The main control chip U2 sends the required test data (such as temperature and rotation speed) to U13 via the serial port. U13 then wirelessly transmits the data to remote devices such as mobile phones or computers via the Bluetooth protocol, enabling remote monitoring and data acquisition. Pin 31 of U13 is connected to LED1 (through current-limiting resistor R4). When the Bluetooth module is in different operating states (such as successful connection, data transmission / reception), this pin outputs different level signals to drive the LED to blink, providing users with intuitive visual status indication. Pin 32 of U13 is connected to resistor R3. Connected to pin 21 of U2, U13 pulls this pin low when Bluetooth successfully connects to a remote device, and high when not connected. The main controller U2 monitors this pin level to obtain the real-time connection status in the program logic, thereby deciding whether to send data to avoid data loss. The circuit forms a pull-down resistor network with R1 and R2 to ensure that the reset pin is pulled low to ground by default, preventing the module from being accidentally reset due to interference. When the user presses switch SW1, the 3.3V voltage is directly connected to the reset pin, generating a high-level pulse to achieve manual hardware reset, which is used to restore normal operation when the module communication is abnormal. Pin 12 of U13 is connected to the 3.3V power supply to provide it with a stable operating voltage. Pins 13, 21, and 22 are grounded, forming a complete current loop.

[0040] In a preferred embodiment, the DC motor control and speed detection circuit includes a motor controller U12 and a Hall encoder U11. Pin 1 of the motor controller U12 is connected to pin 18 of the chip U2. Pins 2 and 4 of the motor controller U12 are connected and grounded. Pin 3 of the motor controller U12 is connected to pin 19 of the chip U2. Pin 5 of the motor controller U12 is connected to the other end of the capacitor C4. Pin 6 of the motor controller U12 is grounded. Pin 7 of the motor controller U12 is connected to pin 5 of the Hall encoder U11. Pin 8 of the motor controller U12 is connected to pin 6 of the Hall encoder U11. Pin 1 of the Hall encoder U11 is connected to 3.3V DC. Pin 2 of the Hall encoder U11 is grounded. Pin 3 of the Hall encoder U11 is connected to pin 10 of the chip U2. Pin 4 of the Hall encoder U11 is connected to pin 11 of the chip U2.

[0041] As described above, the main control chip controls the drive output of the motor controller U12 by outputting high / low level or PWM signals, thereby realizing the forward and reverse rotation and stepless speed regulation of the motor. The power supply and filtering of the motor controller U12 are stably supported by capacitor C4. The Hall encoder U11 serves as the speed and direction detection device for the motor shaft. The Hall element generates orthogonal pulse signals when the motor rotates. The main control chip calculates the motor speed and direction based on the frequency and phase difference of these two pulse signals. Simultaneously, the Hall encoder U11 maintains signal interaction with the circuit through pins 7 and 8 of the motor controller U12 to ensure accurate data transmission. The forward and reverse rotation of the motor and the PWM signal are realized through the motor controller U12. M-speed regulation enhances the adaptability of the testing process to different operating conditions. The Hall encoder U11 provides precise pulse signals, and the main control chip can acquire the motor's speed and direction information in real time, achieving high-precision monitoring. Combined with the processing power of the main control chip, the motor's operating status can be recorded in real time and closed-loop control can be performed during the life test, improving the scientific nature and reliability of the test. The motor control and speed detection circuits have a high degree of integration and clear interfaces, ensuring both the stability of motor operation control and the accuracy of test data acquisition. By monitoring and adjusting the multi-dimensional parameters of the motor, the operating characteristics of the motor during the life test can be comprehensively reflected, providing reliable data support for subsequent life assessment.

[0042] The display driver circuit includes a display screen U8, capacitors C14, C17, C18, and C21, resistors R10, C22, C23, and C15. Pin 1 of display screen U8 is grounded. Pin 2 of display screen U8 is connected to one end of capacitor C14. Pin 3 of display screen U8 is connected to the other end of capacitor C14. Pin 4 of display screen U8 is connected to one end of capacitor C17. Pin 5 of display screen U8 is connected to the other end of capacitor C17. Pin 6 of display screen U8 is connected to one end of capacitor C18. Pin 8 of display screen U8 is connected to the other end of capacitor C18, one end of capacitor C21, pins 10, 12, 13, 16, and 17 and grounded. Pin 9 of display screen U8 is connected to the other end of capacitor C21. Pin 11 of display screen U8 is connected to 3.3V DC. Pin 14 of display screen U8 is connected to pin 7 of chip U2. Pin 15 of display screen U8... Pin 18 of display screen U8 is connected to one end of resistor R10, and the other end of resistor R10 is grounded. Pin 19 of display screen U8 is connected to pin 20 and pin 29 of chip U2. Pin 21 of display screen U8 is connected to pins 22, 23, 24, 25, 26, 29, 30, one end of resistor C15, one end of capacitor C23, one end of capacitor C22, and the other end of resistor C15 and grounded. Pin 27 of display screen U8 is connected to the other end of capacitor C23. Pin 28 of display screen U8 is connected to the other end of capacitor C22. It communicates with the main control chip U2 through the I2C bus. When the main control chip U2 obtains the real-time data of motor operation (such as temperature, speed, running time, etc.), it sends the corresponding data to the display driver circuit. The display driver circuit then drives the display screen U8 to display the motor test parameters and running status in real time.

[0043] The input button acquisition circuit includes switches SW4, SW5, and SW6. One end of switch SW4 is connected to one end of each of switches SW5 and SW6 and grounded. The other end of switch SW4 is connected to pin 42 of chip U2. The other end of switch SW5 is connected to pin 41 of chip U2. The other end of switch SW6 is connected to pin 32 of chip U2 and is connected to the button detection pin of the main control chip via a pull-up connection. If switch SW4 is pressed, pin KEY1 is pulled low. Therefore, the main control chip U2 can determine whether a button is pressed by detecting the levels of these three pins. When the user presses different function keys, the circuit feeds back the corresponding low-level signal to the main control chip. After recognizing the input signal, the main control chip executes the corresponding test command, such as start, pause test, parameter setting, data clearing, etc. The buzzer driver circuit includes resistors R8 and R9, capacitor C15, transistor Q2, and buzzer BUZ1. One end of resistor R8 is connected to pin 22 of chip U2, and the other end of resistor R8 is connected to one end of resistor R9 and pin 2 of transistor Q2. The other end of resistor R9 is connected to pin 3 of transistor Q2 and grounded. Pin 1 of transistor Q2 is connected to pin 2 of buzzer BUZ1. Pin 1 of buzzer BUZ1 is connected to one end of capacitor C15 and connected to DC 3.3V. The other end of capacitor C15 is grounded. Transistor Q2 is driven by the control pin of the main control chip U2. When the main control chip outputs a high level, transistor Q2 conducts, and the buzzer sounds, used to emit a prompt or alarm tone. When the output is low, the buzzer is off. In cases of abnormal motor operation, temperature exceeding limits, or test completion, the main control chip can trigger the buzzer to sound, thereby alerting the user.

[0044] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A DC motor life testing circuit, characterized in that, include: The main control chip circuit is used to control and process data during the motor life test process; The power input protection circuit is used to receive external power and provide reverse connection protection and overcurrent protection for the input power. The step-down circuit is connected to the power input protection circuit and the main control chip circuit, and is used to convert the voltage output by the power input protection circuit into DC voltage. Temperature acquisition circuit, which is connected to the main control chip circuit, is used to acquire temperature signals from the motor and the environment and transmit them to the main control chip circuit. The cooling fan control circuit is connected to the main control chip circuit and is used to drive the cooling fan and realize PWM speed regulation according to the signal of the temperature acquisition circuit. The clock circuit is connected to the main control chip circuit and is used to provide accurate timing for the motor life test process, and to maintain timing by relying on a backup battery in the event of a power failure. The storage circuit is connected to the main control chip circuit and is used to store temperature data and operating status data generated during motor testing. The wireless communication circuit is connected to the main control chip circuit and is used to send the temperature data and operating status data in the storage circuit to the external terminal device via Bluetooth. The DC motor control and speed detection circuit is connected to the main control chip circuit and is used to control the forward and reverse rotation and speed regulation of the DC motor, and to detect the motor speed and direction.

2. The DC motor life testing circuit according to claim 1, characterized in that, The main control chip circuit includes chip U2, crystal oscillator U1, capacitors C1 and C5, resistors R5 and C6, switch SW3, capacitors C7, C11, C2, and C8, resistors R6 and R7. Pin 1 of chip U2 is connected to 3.3V DC. Pin 5 of chip U2 is connected to one end of crystal oscillator U1 and one end of capacitor C1. Pin 6 of chip U2 is connected to the other end of crystal oscillator U1 and one end of capacitor C5. The other end of capacitor C1 is connected to the other end of capacitor C5 and grounded. Pin 7 of chip U2 is connected to one end of resistor R5, one end of capacitor C6, and one end of switch SW3. The other end of resistor R5 is connected to 3.3V DC, and the other end of capacitor C6 is connected to the other end of switch SW3. Connect and ground. Connect pin 8 of chip U2 to one end of capacitor C7, one end of capacitor C11, and pin 23 and ground. Connect pin 9 of chip U2 to the other end of capacitor C7. Connect pin 24 of chip U2 to the other end of capacitor C11. Connect pin 48 of chip U2 to one end of capacitor C2. Connect pin 47 of chip U2 to the other end of capacitor C2, pin 44, pin 37, one end of capacitor C8, and pin 35 and ground. Connect pin 36 of chip U2 to the other end of capacitor C8. Connect pin 30 of chip U2 to one end of resistor R6. Connect pin 29 of chip U2 to one end of resistor R7. Connect the other end of resistor R6 to the other end of resistor R7 and connect to DC 3.3V.

3. The DC motor life test circuit according to claim 2, characterized in that, The power input protection circuit includes chip U3, capacitor C3, switch SW2, transistor Q1, capacitor C4, and resettable fuse F1. Pin 1 of chip U3 is connected to one end of capacitor C3, one end of switch SW2, and pin 1 of transistor Q1. The other end of switch SW2 is connected to the power supply. Pins 2 and 3 of chip U3, the other end of capacitor C3, and one end of resettable fuse F1 are connected and grounded. The other end of resettable fuse F1 is grounded. Pin 5 of chip U3 is connected to pin 3 of transistor Q1. Pin 6 of chip U3 is connected to one end of capacitor C4. The other end of capacitor C4 is connected to pin 2 of transistor Q1.

4. The DC motor life testing circuit according to claim 3, characterized in that, The step-down circuit includes chip U4, capacitors C10 and C9, a Schottky diode D1, an inductor L1, capacitors C12 and C13, chip U5, a Schottky diode D2, an inductor L2, capacitors C19 and C20. Pin 1 of chip U4 is connected to one end of capacitor C10, one end of capacitor C9, the other end of capacitor C4, and pin 1 of chip U5. The other end of capacitor C10 is connected to the other end of capacitor C9 and grounded. Pin 2 of chip U4 is connected to one end of Schottky diode D1 and one end of inductor L1. Pin 3 of chip U4 is connected to pin 5, the other end of Schottky diode D1, and the other end of inductor L2. One end of capacitor C12, one end of capacitor C13, pin 6, pin 3 of chip U5, pin 5 of chip U5, one end of Schottky diode D2, one end of capacitor C19, one end of capacitor C20, and pin 6 of chip U5 are connected to ground. Pin 4 of chip U4 is connected to the other end of inductor L1, the other end of capacitor C12, and the other end of capacitor C13. Pin 2 of chip U5 is connected to the other end of Schottky diode D2 and one end of Schottky diode D2. Pin 4 of chip U5 is connected to the other end of inductor L2, the other end of capacitor C19, and the other end of capacitor C20.

5. The DC motor life testing circuit according to claim 2, characterized in that, The temperature acquisition circuit includes resistors R11, R13, R16, and R18, and NTC thermistors R12, R14, R17, and R19. One end of resistor R11 is connected to one end of resistors R13, R16, and R18 and grounded. The other end of resistor R11 is connected to one end of NTC thermistor R12 and pin 17 of chip U2. The other end of resistor R13 is connected to the NTC thermistor... One end of the thermistor R14 is connected to pin 16 of chip U2. The other end of the resistor R16 is connected to one end of the NTC thermistor R17 and pin 15 of chip U2. The other end of the resistor R18 is connected to one end of the NTC thermistor R19 and pin 14 of chip U2. The other end of the NTC thermistor R12 is connected to the other ends of NTC thermistors R14, R17, and R19 and connected to DC 3.3V.

6. The DC motor life test circuit according to claim 2, characterized in that, The cooling fan control circuit includes chip U9, fan M1, capacitors C24, C26, and C27. Pins 1 and 2 of chip U9 and the FAN+ pin of fan M1 are connected. Pins 3, 4, 9, and 10 of chip U9 are connected and grounded. Pins 5 and 6 of chip U9 and the FAN- pin of fan M1 are connected. Pins 13, 14, and 24 of chip U9, one end of capacitor C26, and one end of capacitor C27 are connected and connected to DC 5V. The other end of capacitor C26 and capacitor C27 are grounded. Pins 18 and 22 of chip U9 are connected and grounded. Pins 19, 20, and 21 of chip U9 and one end of capacitor C24 are connected and connected to DC 3.3V. The other end of capacitor C24 is grounded. Pin 23 of chip U9 is connected to pin 33 of chip U2.

7. The DC motor life test circuit according to claim 2, characterized in that, The clock circuit includes chip U6, capacitor C16, and battery U7. Pin 2 of chip U6 is connected to one end of capacitor C16 and connected to DC 3.3V. Pin 5 of chip U6 is connected to the other end of capacitor C16 and grounded. Pin 6 of chip U6 is connected to the positive terminal of battery U7, and the negative terminal of battery U7 is grounded. Pin 7 of chip U6 is connected to pin 29 of chip U2, and pin 8 of chip U6 is connected to pin 30 of chip U2.

8. The DC motor life test circuit according to claim 2, characterized in that, The storage circuit includes chip U10 and capacitor C25. Pin 1 of chip U10 is connected to pin 25 of chip U2. Pin 2 of chip U10 is connected to pin 27 of chip U2. Pin 3 of chip U10 is connected to pins 7 and 8 and one end of capacitor C25 and connected to DC 3.3V. Pin 4 of chip U10 is connected to the other end of capacitor C25 and grounded. Pin 5 of chip U10 is connected to pin 28 of chip U2. Pin 6 of chip U10 is connected to pin 26 of chip U2.

9. The DC motor life testing circuit according to claim 2, characterized in that, The wireless communication circuit includes chip U13, resistor R1, switch SW1, resistors R2, R3, and R4, and LED1. Pin 1 of chip U13 is connected to pin 13 of chip U2, and pin 2 of chip U13 is connected to pin 12 of chip U2. Pin 12 of chip U13 is connected to DC 3.3V. Pins 13, 21, and 22 of chip U13 are all grounded. Pin 31 of chip U13 is connected to one end of resistor R4, and the other end of resistor R4 is connected to one end of LED1. The other end of LED1 is grounded. Pin 32 of chip U13 is connected to one end of resistor R3, and the other end of resistor R3 is connected to pin 21 of chip U2. Pin 34 of chip U13 is connected to one end of resistor R1 and one end of resistor R2. The other end of resistor R1 is connected to one end of switch SW1, and the other end of switch SW1 is connected to DC 3.3V. The other end of resistor R2 is grounded.

10. The DC motor life testing circuit according to claim 3, characterized in that, The DC motor control and speed detection circuit includes a motor controller U12 and a Hall encoder U11. Pin 1 of the motor controller U12 is connected to pin 18 of the chip U2. Pins 2 and 4 of the motor controller U12 are connected and grounded. Pin 3 of the motor controller U12 is connected to pin 19 of the chip U2. Pin 5 of the motor controller U12 is connected to the other end of capacitor C4. Pin 6 of the motor controller U12 is grounded. Pin 7 of the motor controller U12 is connected to pin 5 of the Hall encoder U11. Pin 8 of the motor controller U12 is connected to pin 6 of the Hall encoder U11. Pin 1 of the Hall encoder U11 is connected to 3.3V DC. Pin 2 of the Hall encoder U11 is grounded. Pin 3 of the Hall encoder U11 is connected to pin 10 of the chip U2. Pin 4 of the Hall encoder U11 is connected to pin 11 of the chip U2.

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