Closed-loop DC motor PWM control rotating speed measuring device

Abstract

The utility model discloses a closed-loop DC motor PWM control rotating speed measuring device, which relates to the technical field of rotating speed measuring devices and comprises a microcontroller module and a DC motor module, and a PWM power amplification circuit module is arranged between the microcontroller module and the DC motor module. The utility model aims to solve the problems that a traditional direct current motor control method mainly depends on an analog circuit, although the control of a motor can be realized to a certain extent, certain limitations exist in the aspects of stability, accuracy and flexibility, and the like. According to the closed-loop direct current motor PWM control rotating speed measuring device, the mode that a microcontroller transmits PWM signals and a Hall sensor collects signals is adopted, real-time collection, display and control functions of the rotating speed of the direct current motor can be achieved, and compared with a traditional analog circuit, the closed-loop direct current motor PWM control rotating speed measuring device is more accurate in measurement and more stable in control effect.

Description

Technical Field

[0001] This utility model relates to the technical field of speed measurement devices, and in particular to a closed-loop DC motor PWM control speed measurement device. Background Technology

[0002] With the rapid development of science and technology and the increasing depth of industrial automation, motor control technology, as a key component, has attracted widespread attention from engineers and researchers. Among the many types of motors, DC motors, with their excellent speed regulation performance and high efficiency, have been widely used in many fields such as industrial production lines, transportation vehicles, and household appliances.

[0003] However, traditional DC motor control methods mainly rely on analog circuits. While they can control the motor to some extent, they have limitations in terms of stability, accuracy, and flexibility. Therefore, improving the accuracy of DC motor speed measurement and the stability of speed control is an urgent problem to be solved.

[0004] Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a closed-loop DC motor PWM control speed measurement device, which solves the technical problem that traditional DC motor control methods mainly rely on analog circuits. Although they can achieve motor control to a certain extent, they have certain limitations in terms of stability, accuracy, and flexibility. Utility Model Content

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A closed-loop DC motor PWM control speed measurement device includes a microcontroller module and a DC motor module. A PWM power amplifier circuit module is provided between the microcontroller module and the DC motor module. The microcontroller transmits PWM signals to the PWM power amplifier circuit module through a data transmission line. The microcontroller module is equipped with a button speed control module for adjusting the speed of the DC motor, a speed measurement module for measuring the speed of the DC motor module, and a real-time display module for displaying the speed of the DC motor.

[0008] Preferably, the rotational speed measurement module includes a Hall sensor U4 and a resistor R2. Pin 3 of the Hall sensor U4 is connected to one end of the resistor R2. The power indicator module includes a socket P1 for connecting to a 5V DC power supply and a switch S2. One end of the socket P1 is connected to the ground wire, and the other end is connected to the switch S2. When the switch S2 is closed, power is supplied to the circuit.

[0009] Preferably, the key speed regulating module comprises a speed up 1 key, a speed down 1 key, a speed up 10 key and a speed down 10 key, the microcontroller module is an AT89C51 single-chip microcomputer, and the display module is an LED digital display tube.

[0010] Preferably, the PWM power amplification circuit module comprises a chip L298N, diodes D1, D2, D3 and D4 and a capacitor C4, the chip L298N is electrically connected with a microprocessor in the microcontroller module, a pin 3 of the chip L298N is connected with a positive electrode of the diode D2, a negative electrode of the diode D3 and the capacitor C4, the pin 3 of the chip L298N is connected with the DC motor module, a pin 2 of the chip L298N is connected with a positive electrode of the diode D4, a negative electrode of the diode D1 and the capacitor C4, and the pin 2 of the chip L298N is connected with the DC motor module.

[0011] Compared with the prior art, the closed-loop DC motor PWM control rotating speed measuring device has the following beneficial effects:

[0012] The traditional DC motor control method mainly depends on an analog circuit, although the control of the motor can be realized to a certain extent, but there are certain limitations in stability, accuracy and flexibility, and the like, the closed-loop DC motor PWM control rotating speed measuring device is provided, the real-time collection, display and control functions of the rotating speed of the DC motor can be realized by adopting the microcontroller PWM signal emission and the Hall sensor signal collection mode, and compared with the traditional analog circuit, the measuring is more accurate, and the control effect is more stable. BRIEF DESCRIPTION OF DRAWINGS

[0013] The above description is only a summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model, and can be implemented according to the content of the specification, the following preferred embodiments of the utility model are described in detail with the help of the drawings.

[0014] Figure 1 It is the structural principle diagram of the utility model;

[0015] Figure 2 It is the rotating speed measuring module circuit diagram of the utility model;

[0016] Figure 3 It is the power supply indication module circuit diagram of the utility model;

[0017] Figure 4 It is the key speed regulating module structure diagram of the utility model;

[0018] Figure 5 It is the PWM power amplification circuit module circuit diagram of the utility model. DETAILED DESCRIPTION

[0019] The embodiment of the present application provides a closed-loop DC motor PWM control rotating speed measuring device, effectively solves the technical problem that the traditional DC motor control method mainly depends on analog circuits, can realize the control of the motor to a certain extent, but has certain limitations in stability, accuracy and flexibility. Embodiments

[0020] As shown in Figure 1 - Figure 5 The technical scheme in the embodiment of the present application effectively solves the technical problem that the traditional DC motor control method mainly depends on analog circuits, can realize the control of the motor to a certain extent, but has certain limitations in stability, accuracy and flexibility, and the general idea is as follows:

[0021] In view of the problems in the prior art, the utility model provides a kind of closed-loop DC motor PWM control rotating speed measuring device, including microcontroller module and direct current motor module, PWM power amplifier circuit module is equipped between microcontroller module and direct current motor module, and microcontroller transmits PWM signal to PWM power amplifier circuit module by data transmission line, and the key speed regulating module for adjusting the rotating speed of direct current motor is equipped on microcontroller module, and the rotating speed measuring module for measuring the rotating speed of direct current motor module is equipped on microcontroller module, and the rotating speed display module for displaying the rotating speed of direct current motor in real time is equipped on microcontroller module.

[0022] In the embodiment, as shown in Figure 2 Rotating speed measuring module includes Hall sensor U4 and resistance R2, and the pin 3 of Hall sensor U4 is connected with one end of resistance R2.

[0023] In the embodiment, as shown in Figure 3 Power supply indicating module includes jack P1 for connecting 5V DC power supply and switch S2, one end of jack P1 is connected with ground wire, and the other end is connected with switch S2, when switch S2 is closed, then start to power supply circuit.

[0024] In the embodiment, as shown in Figure 4 Key speed regulating module includes speed +1 button, speed -1 button, speed +10 button and speed -10 button.

[0025] In the embodiment, microcontroller module is AT89C51 single-chip microcomputer, and display module is LED digital display tube.

[0026] In the embodiment, as shown in Figure 5As shown, the PWM power amplifier circuit module includes a chip L298N, diodes D1, D2, D3, D4, and capacitor C4. The chip L298N is electrically connected to the microprocessor in the microcontroller module. Pin 3 of the chip L298N is connected to the anode of diode D2, the cathode of diode D3, and capacitor C4. Pin 3 of the chip L298N is also connected to the DC motor module. Pin 2 of the chip L298N is connected to the anode of diode D4, the cathode of diode D1, and capacitor C4. Pin 2 of the chip L298N is also connected to the DC motor module.

[0027] This invention addresses the limitations of traditional DC motor control methods, which rely primarily on analog circuits. While these methods can control the motor to some extent, they suffer from limitations in stability, accuracy, and flexibility. A closed-loop DC motor PWM control speed measurement device is proposed. By employing a microcontroller to transmit PWM signals and a Hall sensor to acquire signals, the device enables real-time acquisition, display, and control of DC motor speed. Compared to traditional analog circuits, this device offers more accurate measurements and more stable control.

[0028] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A closed loop DC motor PWM control speed measurement apparatus comprising a microcontroller module and a DC motor module, characterized by: The PWM power amplifier circuit module is arranged between the microcontroller module and the DC motor module, and the microcontroller transmits a PWM signal to the PWM power amplifier circuit module through a data transmission line; The microcontroller module is provided with a button speed regulation module for regulating the rotating speed of the DC motor, a rotating speed measurement module for measuring the rotating speed of the DC motor module, and a rotating speed display module for displaying the rotating speed of the DC motor in real time.

2. A closed loop DC motor PWM control speed measurement device according to claim 1, characterized in that: The rotating speed measurement module comprises a Hall sensor U4 and a resistor R2. Pin 3 of the Hall sensor U4 is connected to one end of the resistor R2.

3. A closed loop DC motor PWM controlled speed measurement device as claimed in claim 2, wherein: The power supply indication module comprises a jack P1 for connecting a 5V DC power supply and a switch S2. One end of the jack P1 is connected to the ground wire, and the other end is connected to the switch S2.

4. A closed loop DC motor PWM controlled speed measurement device as claimed in claim 3, wherein: When the switch S2 is closed, the circuit is powered on.

5. A closed loop DC motor PWM controlled speed measurement device as claimed in claim 4, wherein: The button speed regulation module comprises a speed up 1 button, a speed down 1 button, a speed up 10 button, and a speed down 10 button. The microcontroller module is an AT89C51 single-chip microcomputer.

6. A closed loop DC motor PWM controlled speed measurement device as claimed in claim 5, characterized in that: The display module is an LED digital display tube. The PWM power amplifier circuit module comprises a chip L298N, diodes D1, D2, D3, D4, and a capacitor C4.

7. A closed loop DC motor PWM controlled speed measurement device as claimed in claim 6, characterized in that: The chip L298N is electrically connected to the microprocessor in the microcontroller module. Pin 3 of the chip L298N is connected to the anode of diode D2, the cathode of diode D3, and the capacitor C4. Pin 2 of the chip L298N is connected to the anode of diode D4, the cathode of diode D1, and the capacitor C4. Pin 2 of the chip L298N is connected to the DC motor module.

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