CN217643194U

CN217643194U - Motor control circuit

Info

Publication number: CN217643194U
Application number: CN202221436779.8U
Authority: CN
Inventors: 林煜生
Original assignee: Guangzhou Quanyu Technology Co ltd
Current assignee: Guangzhou Quanyu Technology Co ltd
Priority date: 2022-06-08
Filing date: 2022-06-08
Publication date: 2022-10-21
Anticipated expiration: 2032-06-08

Abstract

The utility model discloses a motor control circuit, which comprises a DC motor driving circuit, a stepping motor driving circuit, a steering engine driving circuit, a DC motor connector, a control input circuit, a display circuit and an alarm circuit which are connected with a CPU controller, and also comprises a stepping motor connector; the direct current motor driving circuit is connected with the direct current motor connector, the direct current motor connector is used for externally connecting a direct current motor, the stepping motor driving circuit is connected with the stepping motor connector, the stepping motor connector is used for externally connecting a direct current motor, and the steering engine driving circuit is used for externally connecting a steering engine. The utility model discloses can realize the general to multiple motor on same experiment circuit board to through the control of CPU controller, realize the simulation training to multiple motor, the student of being convenient for masters the relevant knowledge of motor and instructs relevant technical ability in real time, has improved the teaching effect.

Description

Motor control circuit

Technical Field

The utility model belongs to the technical field of motor control, concretely relates to motor control circuit.

Background

The motor makes outstanding contribution to the development of modern industry and plays a very important role. The motor is used as a power source and widely applied to the fields of electric tools, household appliances, automobile accessories and the like, and common motors comprise direct current motors, stepping motors, steering engines and the like. The dc motor is a rotating electrical machine that can convert dc electrical energy into mechanical energy or convert mechanical energy into dc electrical energy. The stepping motor is a motor that converts an electric pulse signal into a corresponding angular displacement or linear displacement. A steering engine is an actuator that steers a control surface (a kind of rotation) in an autopilot.

In industrial production, a control circuit of a motor is generally provided according to a specific production project. However, in the teaching field, the existing experimental circuit board has no general and intuitive motor control circuit board developed for the specific teaching environment of the motor, so that students cannot learn the relevant knowledge and relevant practical training skills of the motor intuitively and effectively, and the teaching effect is poor.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a motor control circuit for solve and do not have a motor experiment circuit board among the prior art, can supply the technical problem of student's relevant skill of study and training motor directly perceived.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a motor control circuit, which comprises a CPU controller, a DC motor drive circuit, a step motor drive circuit, a steering engine drive circuit, a DC motor connector, a step motor connector, a control input circuit, a display circuit and an alarm circuit;

the CPU controller is respectively connected with the direct current motor driving circuit, the stepping motor driving circuit, the steering engine driving circuit, the direct current motor connector, the control input circuit, the display circuit and the alarm circuit;

the direct current motor driving circuit is connected with the direct current motor connector, the direct current motor connector is used for being externally connected with a direct current motor, the stepping motor driving circuit is connected with the stepping motor connector, the stepping motor connector is used for being externally connected with the direct current motor, and the steering engine driving circuit is used for being externally connected with a steering engine.

In one possible design, the CPU controller includes a single chip microcomputer of model STM32L052K8T 6.

IN a possible design, direct current motor drive circuit includes that the model is DRV8870 DDAR's first driver U2, first driver U2's VM pin inserts 12V voltage VCC, first driver U2's ISEN pin connects ground jointly with GND pin and PAD pin behind the resistance R3, first driver U2's IN2 pin is connected with the PA1 pin of singlechip, first driver U2's IN1 pin is connected with the PA0 pin of singlechip, first driver U2's VREF pin inserts 3.3V voltage, first driver U2's OUT1 pin and OUT2 pin with the direct current motor connector is connected.

In one possible design, the dc motor connector includes a wire-to-board connector CN2 of type X8821WRS-06-9TSN, pin 1 of the wire-to-board connector CN2 is connected to pin OUT1 of the first driver U2, pin 2 of the wire-to-board connector CN2 is grounded, pin 3 of the wire-to-board connector CN2 is connected to pin PB5 of the single chip microcomputer, pin 4 of the wire-to-board connector CN2 is connected to pin PB7 of the single chip microcomputer, and pin 7 and pin 8 of the wire-to-board connector CN2 are grounded after being connected.

In one possible design, the stepping motor driving circuit includes a second driver A1 with a model number of DRV8825 and a dial switch DIP1 with a model number of VDG/S-03HG-R, the FLT pin of the second driver A1 is connected with a 3.3V voltage, the VMOT pin of the second driver A1 is connected with a 12V voltage VCC, two GND pins of the second driver A1 are grounded, the SLP pin and the two GND pins of the second driver A1 are connected, the EN pin of the second driver A1 is connected in series with a resistor R7 and then grounded, the STEP pin of the second driver A1 is connected with the PA2 pin of the single chip microcomputer, the DIR pin of the second driver A1 is connected with the PA3 pin of the single chip microcomputer, the MO pin, the M1 pin and the M2 pin of the second driver A1 are respectively connected with one end of one of the dial switches DIP1, the other end of each of the dial switch DIP1 is connected with a 3.3V voltage, and the RST pin B1, the pin B2 pin and the pin of the second driver A1 are connected with the stepping motor.

In one possible design, the stepping motor connector includes a connector CN3 with a model number of 2.54-4P, pin 1 of the connector CN3 is connected to pin A2 of the second driver A1, pin 2 of the connector CN3 is connected to pin A1 of the second driver A1, pin 3 of the connector CN3 is connected to pin B1 of the second driver A1, pin 4 of the connector CN3 is connected to pin B2 of the second driver A1, and pin 5 and pin 6 of the connector CN3 are connected to ground.

In a possible design, steering wheel drive circuit includes servo driver S1, servo driver S1 ' S2 pins access 5V voltage, servo driver S1 ' S3 pins ground connection, servo driver S1 ' S1 pin is connected with the PB4 pin of singlechip.

In one possible design, the control input circuit comprises a rocker, pin 1 of the rocker is grounded, pin 2 of the rocker is connected with PB0 of the single chip microcomputer, pin 3 of the rocker is connected with pin 4 and then is connected with 3.3V voltage, pin 5 of the rocker is connected with pin PB1 of the single chip microcomputer, pin 6 of the rocker is grounded, pin 7 of the rocker is connected with pin PC14 of the single chip microcomputer, and pin 8 of the rocker is grounded.

In one possible design, the display circuit comprises a display OLED1 with the model of OLED _7PIN, wherein PIN 1 of the display OLED1 is grounded, PIN 2 of the display OLED1 is connected with 3.3V voltage, PIN D0 of the display OLED1 is connected with PIN PA5 of the single chip microcomputer, PIN D1 of the display OLED1 is connected with PIN PA7 of the single chip microcomputer, PIN RES of the display OLED1 is connected with PIN PA8 of the single chip microcomputer, PIN DC of the display OLED1 is connected with PIN PA15 of the single chip microcomputer, and PIN CS of the display OLED1 is connected with PIN PA4 of the single chip microcomputer.

In a possible design, alarm circuit includes BUZZER BUZZER, BUZZER BUZZER's first input end ground connection, BUZZER BUZZER's second input end is connected with PNP triode Q1's projecting pole, PNP triode Q1's collecting electrode inserts 3.3V voltage, PNP triode Q1's base is connected with resistance R4's first end and resistance R5's first end respectively, resistance R4's second end inserts 3.3V voltage, resistance R5's second end is connected with the PA6 pin of singlechip.

Has the beneficial effects that:

the utility model connects the CPU controller with the DC motor driving circuit, the stepping motor driving circuit, the steering engine driving circuit, the DC motor connector, the control input circuit, the display circuit and the alarm circuit; the direct current motor driving circuit is connected with the direct current motor connector, the stepping motor driving circuit is connected with the stepping motor connector, the direct current motor connector is used for externally connecting a direct current motor, the stepping motor connector is used for externally connecting a stepping motor, and the steering engine driving circuit is used for externally connecting a steering engine. Therefore, the universal use of various motors can be realized on the same experimental circuit board, the simulation training of the various motors is realized through the control of the CPU controller, students can conveniently master the related knowledge of the motors in real time and the related skills of practical training, and the teaching effect is improved.

Drawings

Fig. 1 is a circuit block diagram of a motor control circuit in the present embodiment;

fig. 2 is a schematic circuit diagram of the CPU controller in the present embodiment;

fig. 3 is a schematic circuit diagram of a dc motor driving circuit in the present embodiment;

fig. 4 is a schematic circuit diagram of the dc motor connector in the present embodiment;

fig. 5 is a schematic circuit diagram of a stepping motor drive circuit in the present embodiment;

fig. 6 is a schematic circuit diagram of the stepping motor connector in the present embodiment;

fig. 7 is a schematic circuit diagram of a steering engine drive circuit in the present embodiment;

FIG. 8 is a schematic circuit diagram of the control input circuit in the present embodiment;

fig. 9 is a schematic circuit diagram of a display circuit in the present embodiment;

FIG. 10 is a schematic circuit diagram of an alarm circuit in the present embodiment;

fig. 11 is a circuit schematic diagram of an indicating circuit in the present embodiment;

FIG. 12 is a schematic circuit diagram of a voltage regulator circuit according to the present embodiment;

fig. 13 is a circuit schematic diagram of the switching circuit in the present embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are some, but not all embodiments of the present disclosure. All other embodiments obtained by a person skilled in the art based on the embodiments in the present specification without any creative effort belong to the protection scope of the present invention.

Examples

In order to solve the technical problems that no motor experiment circuit board exists in the prior art and can be used for students to visually study and train related motor skills, the embodiment provides a motor control circuit, wherein a CPU controller is respectively connected with a direct current motor drive circuit, a stepping motor drive circuit, a steering engine drive circuit, a direct current motor connector, a control input circuit, a display circuit and an alarm circuit; the direct current motor driving circuit is connected with the direct current motor connector, the stepping motor driving circuit is connected with the stepping motor connector, the direct current motor connector is used for externally connecting a direct current motor, the stepping motor connector is used for externally connecting a stepping motor, and the steering engine driving circuit is used for externally connecting a steering engine. Therefore, the universal use of various motors can be realized on the same experimental circuit board, the simulation training of the various motors is realized through the control of the CPU controller, students can conveniently master the related knowledge of the motors in real time and the related skills of practical training, and the teaching effect is improved.

As shown in fig. 1 to 13, the present embodiment provides a motor control circuit, which includes a CPU controller, a dc motor driving circuit, a stepping motor driving circuit, a steering engine driving circuit, a dc motor connector, a stepping motor connector, a control input circuit, a display circuit, and an alarm circuit;

the direct current motor driving circuit is connected with the direct current motor connector, the direct current motor connector is used for externally connecting a direct current motor, the stepping motor driving circuit is connected with the stepping motor connector, the stepping motor connector is used for externally connecting the direct current motor, and the steering engine driving circuit is used for externally connecting a steering engine.

The CPU controller in this embodiment is configured to generate a corresponding control instruction according to a user input signal, and send the control instruction to the dc motor driving circuit, the stepping motor driving circuit, and/or the steering engine driving circuit, so that the dc motor driving circuit drives an external dc motor to operate through the dc motor connector, or the stepping motor driving circuit drives an external stepping motor to operate through the stepping motor connector, or the steering engine driving circuit drives an external steering engine to operate; the control input circuit is used for receiving input signals of a user so as to enable the CPU controller to receive the input signals and control the corresponding motor to execute a corresponding instruction; the display circuit can be used for displaying the currently controlled motor information, the working state and the like; the alarm circuit is used for giving an alarm when the control signal is abnormal or the motor operates abnormally.

Based on the above disclosure, in this embodiment, the CPU controller is connected to the dc motor driving circuit, the stepping motor driving circuit, the steering engine driving circuit, the dc motor connector, the control input circuit, the display circuit, and the alarm circuit, respectively; the direct current motor driving circuit is connected with the direct current motor connector, the stepping motor driving circuit is connected with the stepping motor connector, the direct current motor connector is used for externally connecting a direct current motor, the stepping motor connector is used for externally connecting a stepping motor, and the steering engine driving circuit is used for externally connecting a steering engine. Therefore, the universal use of various motors can be realized on the same experimental circuit board, the simulation training of the various motors is realized through the control of the CPU controller, students can conveniently master the related knowledge of the motors in real time and the related skills of practical training, and the teaching effect is improved.

As shown in fig. 2, in a specific implementation manner, the CPU controller includes a single chip microcomputer of a model STM32L052K8T6, which is an embedded single chip microcomputer of an STM32 series of single chip microcomputers specially designed to require high performance, low cost and low power consumption, so that the power consumption and cost of the whole control circuit can be reduced while the control performance of the motor is ensured.

As shown IN fig. 3, IN a specific embodiment, the dc motor driving circuit includes a first driver U2 of a DRV8870DDAR model, a VM pin of the first driver U2 is connected to a 12V voltage VCC, an ISEN pin of the first driver U2 is grounded together with a GND pin and a PAD pin after being connected to a resistor R3, an IN2 pin of the first driver U2 is connected to a PA1 pin of the single chip microcomputer, an IN1 pin of the first driver U2 is connected to a PA0 pin of the single chip microcomputer, a VREF pin of the first driver U2 is connected to a 3.3V voltage, and an OUT1 pin and an OUT2 pin of the first driver U2 are connected to the dc motor connector.

As shown in fig. 4, in a specific embodiment, the dc motor connector includes a wire-to-board connector CN2 with a model number of X8821WRS-06-9TSN, pin 1 of the wire-to-board connector CN2 is connected to pin OUT1 of the first driver U2, pin 2 of the wire-to-board connector CN2 is grounded, pin 3 of the wire-to-board connector CN2 is connected to pin PB5 of the single chip microcomputer, pin 4 of the wire-to-board connector CN2 is connected to pin PB7 of the single chip microcomputer, and pin 7 and pin 8 of the wire-to-board connector CN2 are grounded after being connected.

As shown in fig. 5, in a specific embodiment, the stepping motor driving circuit includes a second driver A1 with a model number DRV8825 and a dial switch DIP1 with a model number VDG/S-03HG-R, an FLT pin of the second driver A1 is connected to a voltage of 3.3V, a VMOT pin of the second driver A1 is connected to a voltage VCC of 12V, two GND pins of the second driver A1 are grounded, a RST pin of the second driver A1 is connected to an SLP pin, an EN pin of the second driver A1 is connected in series to a resistor R7 and then grounded, a STEP pin of the second driver A1 is connected to a PA2 pin of the single chip microcomputer, a DIR pin of the second driver A1 is connected to a PA3 pin of the single chip microcomputer, an MO pin, an M1 pin, and an M2 pin of the second driver A1 are respectively connected to one end of one of the dial switch DIP1, the other end of each of the dial switch DIP1 is connected to a voltage of 3.3V, and the second driver a pin A1, the second driver a pin B2 pin and the stepper motor pin are connected to the driver A2 pin.

In a specific embodiment, as shown in fig. 6, the stepping motor connector includes a connector CN3 with a model number of 2.54-4P, a pin 1 of the connector CN3 is connected with a pin A2 of the second driver A1, a pin 2 of the connector CN3 is connected with a pin A1 of the second driver A1, a pin 3 of the connector CN3 is connected with a pin B1 of the second driver A1, a pin 4 of the connector CN3 is connected with a pin B2 of the second driver A1, and

pins

5 and 6 of the connector CN3 are grounded after being connected.

As shown in fig. 7, in a specific embodiment, the steering engine driving circuit includes a servo driver S1, a voltage of 5V is connected to pin 2 of the servo driver S1, pin 3 of the servo driver S1 is grounded, and pin 1 of the servo driver S1 is connected to pin PB4 of the single chip microcomputer.

As shown in fig. 8, in a specific embodiment, the control input circuit includes a rocker, pin 1 of the rocker is grounded, pin 2 of the rocker is connected to PB0 of the single chip microcomputer, pin 3 of the rocker is connected to pin 4 and then is connected to a voltage of 3.3V, pin 5 of the rocker is connected to pin PB1 of the single chip microcomputer, pin 6 of the rocker is grounded, pin 7 of the rocker is connected to pin PC14 of the single chip microcomputer, and pin 8 of the rocker is grounded.

As shown in fig. 9, in a specific embodiment, the display circuit includes a display OLED1 of a type OLED _7PIN, a PIN 1 of the display OLED1 is grounded, a PIN 2 of the display OLED1 is connected to a voltage of 3.3V, a PIN D0 of the display OLED1 is connected to a PIN PA5 of the single chip microcomputer, a PIN D1 of the display OLED1 is connected to a PIN PA7 of the single chip microcomputer, a PIN RES of the display OLED1 is connected to a PIN PA8 of the single chip microcomputer, a PIN DC of the display OLED1 is connected to a PIN PA15 of the single chip microcomputer, and a PIN CS of the display OLED1 is connected to a PIN PA4 of the single chip microcomputer.

As shown in fig. 10, in a specific embodiment, the alarm circuit includes a BUZZER, a first input end of the BUZZER is grounded, a second input end of the BUZZER is connected to an emitter of a PNP triode Q1, a collector of the PNP triode Q1 is connected to a 3.3V voltage, a base of the PNP triode Q1 is connected to a first end of a resistor R4 and a first end of a resistor R5, a second end of the resistor R4 is connected to a 3.3V voltage, and a second end of the resistor R5 is connected to a pin PA6 of the single chip microcomputer.

As shown in fig. 11, preferably, the present embodiment is further provided with an indication circuit for indicating the operating state of the motor, where the indication circuit includes a light emitting diode LED1 and a resistor R6, a forward end of the light emitting diode LED1 is connected to a voltage of 3.3V, a reverse end of the light emitting diode LED1 is connected to one end of the resistor R6, and the other end of the resistor R6 is grounded.

As shown in fig. 12, preferably, the present embodiment is further provided with a voltage stabilizing circuit, configured to perform voltage stabilizing processing ON the voltage of the steering engine, specifically, the voltage stabilizing circuit includes a chip U1 with a model of LM 2596S-adpnopb, a VIN pin of the chip U1 is respectively connected to 12V voltage, one end of a capacitor C3, and one end of a capacitor C4, an ON/OFF pin of the chip U1 and a GND pin are commonly grounded, the other end of the capacitor C3 and the other end of the capacitor C4 are grounded, an OUT pin of the chip U1 is respectively connected to one end of an inductor L1 and a cathode of a zener diode, an FB pin of the chip U1 is respectively connected to one end of a resistor R1, one end of a resistor R2, and one end of a capacitor C1, TAB pins of the chip U1 are respectively connected to an anode of the zener diode and ground, the other end of the inductor L1, the other end of the resistor R1 and the other end of the capacitor C1 are respectively connected to 5V voltage, and the other end of the resistor R2 is connected to 5V voltage.

As shown in fig. 3, preferably, the present embodiment is further provided with a switch circuit for implementing on and off of the motor, the switch circuit includes single-pole bidirectional switches SW1 and SW2 connected in parallel, first common terminals of the switches SW1 and SW2 are connected to the single chip microcomputer, and second common terminals of the switches SW1 and SW2 are commonly grounded.

Based on the above disclosure, in this embodiment, the CPU controller is connected to the dc motor driving circuit, the stepping motor driving circuit, the steering engine driving circuit, the dc motor connector, the control input circuit, the display circuit, and the alarm circuit, respectively; the direct current motor driving circuit is connected with the direct current motor connector, the stepping motor driving circuit is connected with the stepping motor connector, the direct current motor connector is used for externally connecting a direct current motor, the stepping motor connector is used for externally connecting a stepping motor, and the steering engine driving circuit is used for externally connecting a steering engine. Therefore, the universal use of various motors can be realized on the same experimental circuit board, the simulation training of the various motors is realized through the control of the CPU controller, students can conveniently master the related knowledge of the motors in real time and practice related skills, and the teaching effect is improved.

Finally, it should be noted that: the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A motor control circuit is characterized by comprising a CPU controller, a direct current motor driving circuit, a stepping motor driving circuit, a steering engine driving circuit, a direct current motor connector, a stepping motor connector, a control input circuit, a display circuit and an alarm circuit;

2. The motor control circuit of claim 1, wherein the CPU controller comprises a single chip microcomputer of model STM32L052K8T 6.

3. The motor control circuit of claim 2, wherein the dc motor driving circuit comprises a first driver U2 with a DRV8870DDAR model, the VM pin of the first driver U2 is connected to a 12V voltage VCC, the ISEN pin of the first driver U2 is grounded together with the GND pin and the PAD pin after being connected to a resistor R3, the IN2 pin of the first driver U2 is connected to the PA1 pin of the single chip microcomputer, the IN1 pin of the first driver U2 is connected to the PA0 pin of the single chip microcomputer, the VREF pin of the first driver U2 is connected to a 3.3V voltage, and the OUT1 pin and the OUT2 pin of the first driver U2 are connected to the dc motor connector.

4. The motor control circuit of claim 3, wherein the dc motor connector comprises a wire-to-board connector CN2 of type X8821WRS-06-9TSN, pin 1 of the wire-to-board connector CN2 is connected to pin OUT1 of the first driver U2, pin 2 of the wire-to-board connector CN2 is grounded, pin 3 of the wire-to-board connector CN2 is connected to pin PB5 of the single chip microcomputer, pin 4 of the wire-to-board connector CN2 is connected to pin PB7 of the single chip microcomputer, and pin 7 and pin 8 of the wire-to-board connector CN2 are grounded after being connected.

5. The motor control circuit according to claim 2, wherein the stepping motor driving circuit includes a second driver A1 having a model number DRV8825 and a dial switch DIP1 having a model number VDG/S-03HG-R, the FLT pin of the second driver A1 is connected to a voltage of 3.3V, the VMOT pin of the second driver A1 is connected to a voltage VCC of 12V, two GND pins of the second driver A1 are grounded, the RST pin of the second driver A1 is connected to the SLP pin, the EN pin of the second driver A1 is connected in series to a resistor R7 and then grounded, the STEP pin of the second driver A1 is connected to the PA2 pin of the single chip microcomputer, the DIR pin of the second driver A1 is connected to the PA3 pin of the single chip microcomputer, the pin M1, and the pin M2 of the second driver A1 are respectively connected to one end of one of the dial switches DIP1, the other end of each of the dial switch DIP1 is connected to a voltage 3.3V, and the pin of the second driver A1, the pin B2 and the stepper motor pin.

6. The motor control circuit according to claim 5, wherein the stepping motor connector comprises a connector CN3 with a model number of 2.54-4P, a pin 1 of the connector CN3 is connected with a pin A2 of the second driver A1, a pin 2 of the connector CN3 is connected with a pin A1 of the second driver A1, a pin 3 of the connector CN3 is connected with a pin B1 of the second driver A1, a pin 4 of the connector CN3 is connected with a pin B2 of the second driver A1, and pins 5 and 6 of the connector CN3 are connected and then grounded.

7. The motor control circuit according to claim 2, wherein the steering engine driving circuit comprises a servo driver S1, a 5V voltage is connected to a pin 2 of the servo driver S1, a pin 3 of the servo driver S1 is grounded, and a pin 1 of the servo driver S1 is connected with a pin PB4 of the single chip microcomputer.

8. The motor control circuit according to claim 2, wherein the control input circuit comprises a rocker, pin 1 of the rocker is grounded, pin 2 of the rocker is connected with PB0 of the single chip microcomputer, pin 3 of the rocker is connected with pin 4 and then is connected with 3.3V voltage, pin 5 of the rocker is connected with pin PB1 of the single chip microcomputer, pin 6 of the rocker is grounded, pin 7 of the rocker is connected with pin PC14 of the single chip microcomputer, and pin 8 of the rocker is grounded.

9. The motor control circuit according to claim 2, wherein the display circuit comprises a display OLED1 of the type OLED _7PIN, a PIN 1 of the display OLED1 is grounded, a PIN 2 of the display OLED1 is connected with 3.3V, a PIN D0 of the display OLED1 is connected with a PIN PA5 of the single chip microcomputer, a PIN D1 of the display OLED1 is connected with a PIN PA7 of the single chip microcomputer, a PIN RES of the display OLED1 is connected with a PIN PA8 of the single chip microcomputer, a PIN DC of the display OLED1 is connected with a PIN PA15 of the single chip microcomputer, and a PIN CS of the display OLED1 is connected with a PIN PA4 of the single chip microcomputer.

10. The motor control circuit according to claim 2, wherein the alarm circuit includes a BUZZER, a first input end of the BUZZER is grounded, a second input end of the BUZZER is connected with an emitter of a PNP triode Q1, a collector of the PNP triode Q1 is connected to a 3.3V voltage, a base of the PNP triode Q1 is connected to a first end of a resistor R4 and a first end of a resistor R5, respectively, a second end of the resistor R4 is connected to a 3.3V voltage, and a second end of the resistor R5 is connected to a pin PA6 of the single chip microcomputer.