A three-phase non-inductive motor control system based on double synchronous motors

Abstract

The utility model belongs to control circuit technical field, concretely relates to a three -phase non -inductive motor control system based on double synchronous motor. DC power supply input circuit is connected with main control MCU, BLDC drive circuit and double synchronous motor drive circuit respectively, main control MCU still is connected with BLDC drive circuit, serial communication circuit and double synchronous motor drive. The utility model is used to solve above -mentioned problem, reduces the length of wire, has reduced raw material cost and production cost.

Description

Technical Field

[0001] This utility model belongs to the field of control circuit technology, specifically relating to a three-phase sensorless motor control system based on dual synchronous motors. Background Technology

[0002] The motor drive board of the fan products currently sold on the market only has one synchronous motor. To achieve up-down and left-right oscillation, two synchronous motors are needed. The other synchronous motor can only be on the host computer system, which is usually installed on the chassis. Since the synchronous motor is installed on the fan head, a long set of wires is needed to run from the chassis through the column to the synchronous motor on the fan head, which increases the cost of raw materials and production. Summary of the Invention

[0003] This invention provides a three-phase sensorless motor control system based on dual synchronous motors to solve the above problems, reduce the length of wires, and reduce raw material and production costs.

[0004] This utility model is achieved through the following technical solution:

[0005] A three-phase sensorless motor control system based on dual synchronous motors, the system including a DC power input circuit, a serial communication circuit, a main control MCU, a BLDC drive circuit and a dual synchronous motor drive circuit;

[0006] The DC power input circuit is connected to the main control MCU, the BLDC drive circuit, and the dual synchronous motor drive circuit respectively; the main control MCU is also connected to the BLDC drive circuit, the serial communication circuit, and the dual synchronous motor drive.

[0007] Furthermore, the DC power input circuit supplies power to the main control MCU, the BLDC drive circuit, and the dual synchronous motor drive circuit. The main control MCU transmits signals bidirectionally with the BLDC drive circuit and the serial communication circuit. The main control MCU sends control signals to the dual synchronous motor drive.

[0008] Furthermore, the main control MCU includes a chip U1. Terminal 1 of chip U1 is connected to one end of capacitor C2, terminal 7 of chip U1, and the operating voltage 5V, respectively. The other end of capacitor C2 is grounded. Terminals 2 and 3 of chip U1 are both connected to the power supply and serial port input / output circuit. Terminal 4 of chip U1 is connected to the dual synchronous motor drive circuit. Terminal 5 of chip U1 is connected to the hardware overcurrent input circuit. Terminal 6 of chip U1 is connected to the bus voltage detection circuit. Terminal 8 of chip U1 is connected to one end of capacitor C4 and the operating voltage VCC, respectively. The other end of capacitor C4 is grounded. Terminals 9, 10, 11, 12, 13, and 14 of chip U1 are all connected to the BLDC drive circuit.

[0009] Terminals 16, 17, 18, and 19 of chip U1 are all connected to the operational amplifier input circuit. Terminals 20, 21, and 22 of chip U1 are all connected to the dual synchronous motor drive circuit. Terminal 23 of chip U1 is connected to the programming port.

[0010] Furthermore, the power supply and serial port input / output circuit includes a resistor R1. One end of the resistor R1 is connected to terminal 2 of chip U1 and one end of resistor R4. The other end of the resistor R1 is connected to terminal 3 of interface CN1. Terminal 4 of interface CN1 is connected to one end of resistor R2. The other end of resistor R2 is connected to terminal 3 of chip U1 and one end of resistor R3. The other end of resistor R4 is connected to the other end of resistor R3 and then grounded. Terminal 1 of interface CN1 is connected to the operating voltage VCC, the positive terminal of capacitor CAP, and the negative terminal of Zener diode. The positive terminal of Zener diode is connected to the negative terminal of capacitor CAP and terminal 2 of interface CN1 and then grounded.

[0011] Furthermore, the dual synchronous motor drive circuit includes a resistor R25. One end of the resistor R25 is connected to one end of the resistor R26 and terminal 4 of the chip U1. The other end of the resistor R25 is connected to the collector of the transistor Q4 and the dual synchronous motor drive H-bridge circuit. The other end of the resistor R26 is connected to the collector of the transistor Q5 and the dual synchronous motor drive H-bridge circuit.

[0012] The base of transistor Q4 is connected to one end of resistor R27 and one end of resistor R29, respectively. The other end of resistor R27 is connected to terminal 21 of chip U1, and the other end of resistor R29 is connected to the emitter of transistor Q4 and then grounded.

[0013] The base of transistor Q5 is connected to one end of resistor R28 and one end of resistor R30, respectively. The other end of resistor R28 is connected to terminal 20 of chip U1, and the other end of resistor R30 is connected to the emitter of transistor Q5 and then grounded.

[0014] The 22nd terminal of the chip U1 is connected to one end of resistor R31 and one end of resistor R32, respectively. The other end of resistor R31 is connected to the collector of transistor Q6 and the dual synchronous motor drive H-bridge circuit, respectively. The other end of resistor R32 is connected to the collector of transistor Q7 and the dual synchronous motor drive H-bridge circuit, respectively.

[0015] The base of transistor Q6 is connected to one end of resistor R33 and one end of resistor R35, respectively. The other end of resistor R33 is connected to terminal 21 of chip U1, and the other end of resistor R35 is connected to the emitter of transistor Q6 and then grounded.

[0016] The base of transistor Q7 is connected to one end of resistor R34 and one end of resistor R36, respectively. The other end of resistor R34 is connected to terminal 20 of chip U1, and the other end of resistor R36 is connected to the emitter of transistor Q7 and then grounded.

[0017] Furthermore, the dual synchronous motor drive H-bridge circuit includes a resistor R37, the other end of which is connected to terminal 2 of chip U2, and terminal 1 of chip U2 is connected to one end of capacitor C15 and the operating voltage 5V, while the other end of capacitor C15 is grounded.

[0018] Terminal 3 of chip U2 is connected to the other end of resistor R38, and terminal 4 of chip U2 is connected to one end of capacitor C16 and the operating voltage VCC. The other end of capacitor C16 is grounded.

[0019] Terminal 5 of chip U2 is connected to one end of capacitor C18. The other end of capacitor C18 is connected to terminal 6 of chip U2, terminal 7 of chip U2, and one end of capacitor C17, and then grounded. The other end of capacitor C17 is connected to terminal 8 of chip U2.

[0020] Terminal 1 of chip U3 is connected to one end of capacitor C19 and the operating voltage 5V, while the other end of capacitor C19 is grounded.

[0021] Terminal 2 of chip U3 is connected to the other end of resistor R8, terminal 3 of chip U3 is connected to the other end of resistor R9, terminal 4 of chip U3 is connected to one end of capacitor C20 and the operating voltage VCC, and the other end of capacitor C20 is grounded.

[0022] Terminal 5 of chip U3 is connected to one end of capacitor C22. The other end of capacitor C22 is connected to terminal 6 of chip U3, terminal 7 of chip U3, and one end of capacitor C21, and then grounded. The other end of capacitor C21 is connected to terminal 8 of chip U3.

[0023] Furthermore, the hardware overcurrent input circuit includes a resistor R10. One end of the resistor R10 is connected to terminal 5 of chip U1, one end of capacitor C8, one end of resistor R24, and one end of resistor R25. The other end of the resistor R10 is connected to the other end of capacitor C8 and then grounded. The other end of the resistor R23 is connected to the operating voltage 5V. The other end of the resistor R24 ​​is connected to one end of resistor RS2, one end of resistor RS1, and one end of resistor RS3 of the phase current sampling circuit.

[0024] Furthermore, the bus voltage detection circuit includes a capacitor C1. One end of the capacitor C1 is connected to terminal 5 of the chip U1 and one end of the resistor R7. The other end of the resistor R7 is connected to one end of the resistor R5 and one end of the resistor R6. The other end of the capacitor C1 is connected to the other end of the resistor R6 and then grounded. The other end of the resistor R5 is connected to the working voltage VCC terminal.

[0025] Furthermore, the BLDC driving circuit includes chip O1, chip O2, and chip O3. Terminal 1 of chip O1 is connected to one end of capacitor C10, one end of resistor R14, and the other end of resistor RS2 in the phase current sampling circuit. Terminal 2 of chip O1 is connected to the other end of capacitor C10, the other end of resistor R14, and one end of resistor R13. The other end of resistor R13 is connected to terminal 10 of chip O1.

[0026] Terminal 3 of chip O1 is connected to one end of capacitor C9, one end of resistor R12, and the working voltage VCC terminal, respectively; terminal 4 of chip O1 is connected to the other end of capacitor C9, the other end of resistor R12, and one end of resistor R11, respectively; the other end of resistor R11 is connected to terminal 9 of chip U1.

[0027] Terminal 5 of chip O1 is connected to terminal 6, terminal 7, and terminal 8 of chip O1, respectively.

[0028] Terminal 1 of chip O2 is connected to one end of capacitor C12, one end of resistor R18, and the other end of resistor RS1 in the phase current sampling circuit; terminal 2 of chip O2 is connected to the other end of capacitor C12, the other end of resistor R18, and one end of resistor R17, and the other end of resistor R17 is connected to terminal 12 of chip U1.

[0029] Terminal 3 of chip O2 is connected to one end of capacitor C11, one end of resistor R16, and the working voltage VCC terminal, respectively; terminal 4 of chip O2 is connected to the other end of capacitor C11, the other end of resistor R16, and one end of resistor R17, respectively; the other end of resistor R17 is connected to terminal 11 of chip U1.

[0030] Terminal 5 of chip O2 is connected to terminals 6, 7, and 8 of chip O2, respectively.

[0031] Terminal 1 of chip O3 is connected to one end of capacitor C14, one end of resistor R22, one end of resistor RS2, one end of resistor RS1, and one end of resistor RS3 of the phase current sampling circuit; terminal 2 of chip O3 is connected to the other end of capacitor C14, the other end of resistor R22, and one end of resistor R21, and the other end of resistor R21 is connected to terminal 14 of chip U1.

[0032] Terminal 3 of chip O3 is connected to one end of capacitor C13, one end of resistor R20, and the working voltage VCC terminal, respectively; terminal 4 of chip O3 is connected to the other end of capacitor C13, the other end of resistor R20, and one end of resistor R19, respectively; the other end of resistor R19 is connected to terminal 13 of chip U1.

[0033] Terminal 5 of chip O3 is connected to terminals 6, 7, and 8 of chip O3, respectively.

[0034] The beneficial effects of this utility model are:

[0035] This invention uses only one timer in the MCU to generate an SPWM (Sinusoidal Pulse Width Modulation) wave to drive two synchronous motors, saving MCU hardware and software resources and making the product more cost-effective. Using SPWM to drive the synchronous motors results in low noise during synchronous operation. Attached Figure Description

[0036] Figure 1 This is the circuit block diagram of this utility model.

[0037] Figure 2This is the circuit diagram of the main control MCU of this utility model.

[0038] Figure 3 This is a circuit diagram of a dual synchronous motor drive according to this utility model.

[0039] Figure 4 This is the circuit diagram of the dual synchronous motor drive H-bridge of this utility model.

[0040] Figure 5 This is the BLDC drive circuit diagram of this utility model.

[0041] Figure 6 This is a circuit diagram of the power supply and serial port input / output ports of this utility model.

[0042] Figure 7 This is a circuit diagram for bus voltage detection of this utility model.

[0043] Figure 8 This is the phase current sampling circuit diagram of this utility model.

[0044] Figure 9 This is the hardware overcurrent input circuit diagram of this utility model.

[0045] Figure 10 This is the circuit diagram of the programming port of this utility model.

[0046] Figure 11 This is the operational amplifier input circuit diagram of this utility model.

[0047] Figure 12 This is the circuit diagram of the output port of the dual synchronous motor of this utility model. Detailed Implementation

[0048] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of this application with unnecessary detail.

[0049] It should be understood that, when used in this specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0050] It should also be understood that the terminology used in this application specification is for the purpose of describing particular embodiments only and is not intended to limit the application. As used in this application specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0051] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0052] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0053] like Figure 1 As shown, a three-phase sensorless motor control system based on dual synchronous motors is disclosed. The system includes a DC power input circuit, a serial communication circuit, a main control MCU, a BLDC drive circuit, and a dual synchronous motor drive circuit.

[0054] The DC power input circuit is connected to the main control MCU, the BLDC drive circuit, and the dual synchronous motor drive circuit respectively; the main control MCU is also connected to the BLDC drive circuit, the serial communication circuit, and the dual synchronous motor drive.

[0055] like Figure 1 As shown, the DC power input circuit further supplies power to the main control MCU, the BLDC drive circuit, and the dual synchronous motor drive circuit. The main control MCU transmits signals bidirectionally with the BLDC drive circuit and the serial communication circuit. The main control MCU sends control signals to the dual synchronous motor drive.

[0056] As shown in the figure, the main control MCU further includes chip U1. Terminal 1 of chip U1 is connected to one end of capacitor C2, terminal 7 of chip U1, and the working voltage 5V, respectively. The other end of capacitor C2 is grounded. Terminals 2 and 3 of chip U1 are both connected to the power supply and serial port input / output circuit. Terminal 4 of chip U1 is connected to the dual synchronous motor drive circuit. Terminal 5 of chip U1 is connected to the hardware overcurrent input circuit. Terminal 6 of chip U1 is connected to the bus voltage detection circuit. Terminal 8 of chip U1 is connected to one end of capacitor C4 and the working voltage VCC, respectively. The other end of capacitor C4 is grounded. Terminals 9, 10, 11, 12, 13, and 14 of chip U1 are all connected to the BLDC drive circuit.

[0057] Terminals 16, 17, 18, and 19 of chip U1 are all connected to the operational amplifier input circuit. Terminals 20, 21, and 22 of chip U1 are all connected to the dual synchronous motor drive circuit. Terminal 23 of chip U1 is connected to the programming port.

[0058] Furthermore, the power supply and serial port input / output circuit includes a resistor R1. One end of the resistor R1 is connected to terminal 2 of chip U1 and one end of resistor R4. The other end of the resistor R1 is connected to terminal 3 of interface CN1. Terminal 4 of interface CN1 is connected to one end of resistor R2. The other end of resistor R2 is connected to terminal 3 of chip U1 and one end of resistor R3. The other end of resistor R4 is connected to the other end of resistor R3 and then grounded. Terminal 1 of interface CN1 is connected to the operating voltage VCC, the positive terminal of capacitor CAP, and the negative terminal of Zener diode. The positive terminal of Zener diode is connected to the negative terminal of capacitor CAP and terminal 2 of interface CN1 and then grounded.

[0059] Furthermore, the dual synchronous motor drive circuit includes a resistor R25. One end of the resistor R25 is connected to one end of the resistor R26 and terminal 4 of the chip U1. The other end of the resistor R25 is connected to the collector of the transistor Q4 and the dual synchronous motor drive H-bridge circuit. The other end of the resistor R26 is connected to the collector of the transistor Q5 and the dual synchronous motor drive H-bridge circuit.

[0060] The base of transistor Q4 is connected to one end of resistor R27 and one end of resistor R29, respectively. The other end of resistor R27 is connected to terminal 21 of chip U1, and the other end of resistor R29 is connected to the emitter of transistor Q4 and then grounded.

[0061] The base of transistor Q5 is connected to one end of resistor R28 and one end of resistor R30, respectively. The other end of resistor R28 is connected to terminal 20 of chip U1, and the other end of resistor R30 is connected to the emitter of transistor Q5 and then grounded.

[0062] The 22nd terminal of the chip U1 is connected to one end of resistor R31 and one end of resistor R32, respectively. The other end of resistor R31 is connected to the collector of transistor Q6 and the dual synchronous motor drive H-bridge circuit, respectively. The other end of resistor R32 is connected to the collector of transistor Q7 and the dual synchronous motor drive H-bridge circuit, respectively.

[0063] The base of transistor Q6 is connected to one end of resistor R33 and one end of resistor R35, respectively. The other end of resistor R33 is connected to terminal 21 of chip U1, and the other end of resistor R35 is connected to the emitter of transistor Q6 and then grounded.

[0064] The base of transistor Q7 is connected to one end of resistor R34 and one end of resistor R36, respectively. The other end of resistor R34 is connected to terminal 20 of chip U1, and the other end of resistor R36 is connected to the emitter of transistor Q7 and then grounded.

[0065] Furthermore, the dual synchronous motor drive H-bridge circuit includes a resistor R37, the other end of which is connected to terminal 2 of chip U2, and terminal 1 of chip U2 is connected to one end of capacitor C15 and the operating voltage 5V, while the other end of capacitor C15 is grounded.

[0066] Terminal 3 of chip U2 is connected to the other end of resistor R38, and terminal 4 of chip U2 is connected to one end of capacitor C16 and the operating voltage VCC. The other end of capacitor C16 is grounded.

[0067] Terminal 5 of chip U2 is connected to one end of capacitor C18. The other end of capacitor C18 is connected to terminal 6 of chip U2, terminal 7 of chip U2, and one end of capacitor C17, and then grounded. The other end of capacitor C17 is connected to terminal 8 of chip U2.

[0068] Terminal 1 of chip U3 is connected to one end of capacitor C19 and the operating voltage 5V, while the other end of capacitor C19 is grounded.

[0069] Terminal 2 of chip U3 is connected to the other end of resistor R8, terminal 3 of chip U3 is connected to the other end of resistor R9, terminal 4 of chip U3 is connected to one end of capacitor C20 and the operating voltage VCC, and the other end of capacitor C20 is grounded.

[0070] Terminal 5 of chip U3 is connected to one end of capacitor C22. The other end of capacitor C22 is connected to terminal 6 of chip U3, terminal 7 of chip U3, and one end of capacitor C21, and then grounded. The other end of capacitor C21 is connected to terminal 8 of chip U3.

[0071] Furthermore, the hardware overcurrent input circuit includes a resistor R10. One end of the resistor R10 is connected to terminal 5 of chip U1, one end of capacitor C8, one end of resistor R24, and one end of resistor R25. The other end of the resistor R10 is connected to the other end of capacitor C8 and then grounded. The other end of the resistor R23 is connected to the operating voltage 5V. The other end of the resistor R24 ​​is connected to one end of resistor RS2, one end of resistor RS1, and one end of resistor RS3 of the phase current sampling circuit.

[0072] Furthermore, the bus voltage detection circuit includes a capacitor C1. One end of the capacitor C1 is connected to terminal 5 of the chip U1 and one end of the resistor R7. The other end of the resistor R7 is connected to one end of the resistor R5 and one end of the resistor R6. The other end of the capacitor C1 is connected to the other end of the resistor R6 and then grounded. The other end of the resistor R5 is connected to the working voltage VCC terminal.

[0073] Furthermore, the BLDC driving circuit includes chip O1, chip O2, and chip O3. Terminal 1 of chip O1 is connected to one end of capacitor C10, one end of resistor R14, and the other end of resistor RS2 in the phase current sampling circuit. Terminal 2 of chip O1 is connected to the other end of capacitor C10, the other end of resistor R14, and one end of resistor R13. The other end of resistor R13 is connected to terminal 10 of chip O1.

[0074] Terminal 3 of chip O1 is connected to one end of capacitor C9, one end of resistor R12, and the working voltage VCC terminal, respectively; terminal 4 of chip O1 is connected to the other end of capacitor C9, the other end of resistor R12, and one end of resistor R11, respectively; the other end of resistor R11 is connected to terminal 9 of chip U1.

[0075] Terminal 5 of chip O1 is connected to terminal 6, terminal 7, and terminal 8 of chip O1, respectively.

[0076] Terminal 1 of chip O2 is connected to one end of capacitor C12, one end of resistor R18, and the other end of resistor RS1 in the phase current sampling circuit; terminal 2 of chip O2 is connected to the other end of capacitor C12, the other end of resistor R18, and one end of resistor R17, and the other end of resistor R17 is connected to terminal 12 of chip U1.

[0077] Terminal 3 of chip O2 is connected to one end of capacitor C11, one end of resistor R16, and the working voltage VCC terminal, respectively; terminal 4 of chip O2 is connected to the other end of capacitor C11, the other end of resistor R16, and one end of resistor R17, respectively; the other end of resistor R17 is connected to terminal 11 of chip U1.

[0078] Terminal 5 of chip O2 is connected to terminals 6, 7, and 8 of chip O2, respectively.

[0079] Terminal 1 of chip O3 is connected to one end of capacitor C14, one end of resistor R22, one end of resistor RS2, one end of resistor RS1, and one end of resistor RS3 of the phase current sampling circuit; terminal 2 of chip O3 is connected to the other end of capacitor C14, the other end of resistor R22, and one end of resistor R21, and the other end of resistor R21 is connected to terminal 14 of chip U1.

[0080] Terminal 3 of chip O3 is connected to one end of capacitor C13, one end of resistor R20, and the working voltage VCC terminal, respectively; terminal 4 of chip O3 is connected to the other end of capacitor C13, the other end of resistor R20, and one end of resistor R19, respectively; the other end of resistor R19 is connected to terminal 13 of chip U1.

[0081] Terminal 5 of chip O3 is connected to terminals 6, 7, and 8 of chip O3, respectively.

[0082] This control circuit's dual synchronous motor drive unit uses only one timer from the MCU (LKS32MC037EM6S8) to generate SPWM (sinusoidal pulse width modulation) waves to drive two synchronous motors. When 0V is applied to the collectors of transistors Q4 and Q5, synchronous motor B stops running; when 5V is applied, synchronous motor B starts running. When 0V is applied to the collectors of transistors Q6 and Q7, synchronous motor A stops running; when 5V is applied, synchronous motor A starts running, thus solving the problem of using one timer to control two synchronous motors simultaneously.

[0083] The motor drive unit of this control circuit uses the LKS32MC037EM6S8 MCU chip, a 48MHz 32-bit Cortex-M0 core. This system uses a sensorless FOC method to drive a three-phase brushless motor, resulting in low operating noise. Compared with a sensor-based FOC, it eliminates the need for three Hall effect ICs, making the circuit simpler and reducing costs.

[0084] The serial communication unit of this control circuit communicates with the host computer system via the MCU serial port. This system receives motor speed data and synchronous motor switch commands from the host computer via the serial port, and also sends motor speed data back to the host computer. If the motor is stalled due to external force, the system can promptly send a stall command to the host computer, which then cuts off the motor power.

Claims

1. A three-phase sensorless motor control system based on dual synchronous motors, characterized in that, The system includes a DC power input circuit, a serial communication circuit, a main control MCU, a BLDC drive circuit, and a dual synchronous motor drive circuit. The DC power input circuit is connected to the main control MCU, the BLDC drive circuit, and the dual synchronous motor drive circuit respectively; the main control MCU is also connected to the BLDC drive circuit, the serial communication circuit, and the dual synchronous motor drive.

2. The three-phase sensorless motor control system according to claim 1, characterized in that, The DC power input circuit supplies power to the main control MCU, BLDC drive circuit and dual synchronous motor drive circuit. The main control MCU transmits signals bidirectionally with the BLDC drive circuit and serial communication circuit. The main control MCU sends control signals to the dual synchronous motor drive.

3. The three-phase sensorless motor control system according to claim 1, characterized in that, The main control MCU includes chip U1. Terminal 1 of chip U1 is connected to one end of capacitor C2, terminal 7 of chip U1, and the operating voltage 5V. The other end of capacitor C2 is grounded. Terminals 2 and 3 of chip U1 are connected to the power supply and serial port input / output circuit. Terminal 4 of chip U1 is connected to the dual synchronous motor drive circuit. Terminal 5 of chip U1 is connected to the hardware overcurrent input circuit. Terminal 6 of chip U1 is connected to the bus voltage detection circuit. Terminal 8 of chip U1 is connected to one end of capacitor C4 and the operating voltage VCC. The other end of capacitor C4 is grounded. Terminals 9, 10, 11, 12, 13, and 14 of chip U1 are all connected to the BLDC drive circuit. Terminals 16, 17, 18, and 19 of chip U1 are all connected to the operational amplifier input circuit. Terminals 20, 21, and 22 of chip U1 are all connected to the dual synchronous motor drive circuit. Terminal 23 of chip U1 is connected to the programming port.

4. The three-phase sensorless motor control system according to claim 3, characterized in that, The power supply and serial port input / output circuit includes a resistor R1. One end of resistor R1 is connected to terminal 2 of chip U1 and one end of resistor R4. The other end of resistor R1 is connected to terminal 3 of interface CN1. Terminal 4 of interface CN1 is connected to one end of resistor R2. The other end of resistor R2 is connected to terminal 3 of chip U1 and one end of resistor R3. The other end of resistor R4 is connected to the other end of resistor R3 and then grounded. Terminal 1 of interface CN1 is connected to the operating voltage VCC, the positive terminal of capacitor CAP, and the negative terminal of Zener diode. The positive terminal of Zener diode is connected to the negative terminal of capacitor CAP and terminal 2 of interface CN1 and then grounded.

5. The three-phase sensorless motor control system according to claim 3, characterized in that, The dual synchronous motor drive circuit includes a resistor R25. One end of the resistor R25 is connected to one end of the resistor R26 and terminal 4 of the chip U1. The other end of the resistor R25 is connected to the collector of the transistor Q4 and the dual synchronous motor drive H-bridge circuit. The other end of the resistor R26 is connected to the collector of the transistor Q5 and the dual synchronous motor drive H-bridge circuit. The base of transistor Q4 is connected to one end of resistor R27 and one end of resistor R29, respectively. The other end of resistor R27 is connected to terminal 21 of chip U1, and the other end of resistor R29 is connected to the emitter of transistor Q4 and then grounded. The base of transistor Q5 is connected to one end of resistor R28 and one end of resistor R30, respectively. The other end of resistor R28 is connected to terminal 20 of chip U1, and the other end of resistor R30 is connected to the emitter of transistor Q5 and then grounded. The 22nd terminal of the chip U1 is connected to one end of resistor R31 and one end of resistor R32, respectively. The other end of resistor R31 is connected to the collector of transistor Q6 and the dual synchronous motor drive H-bridge circuit, respectively. The other end of resistor R32 is connected to the collector of transistor Q7 and the dual synchronous motor drive H-bridge circuit, respectively. The base of transistor Q6 is connected to one end of resistor R33 and one end of resistor R35, respectively. The other end of resistor R33 is connected to terminal 21 of chip U1, and the other end of resistor R35 is connected to the emitter of transistor Q6 and then grounded. The base of transistor Q7 is connected to one end of resistor R34 and one end of resistor R36, respectively. The other end of resistor R34 is connected to terminal 20 of chip U1, and the other end of resistor R36 is connected to the emitter of transistor Q7 and then grounded.

6. The three-phase sensorless motor control system according to claim 5, characterized in that, The dual synchronous motor drive H-bridge circuit includes a resistor R37. The other end of the resistor R37 is connected to terminal 2 of chip U2. Terminal 1 of chip U2 is connected to one end of capacitor C15 and the operating voltage 5V. The other end of capacitor C15 is grounded. Terminal 3 of chip U2 is connected to the other end of resistor R38, and terminal 4 of chip U2 is connected to one end of capacitor C16 and the operating voltage VCC. The other end of capacitor C16 is grounded. Terminal 5 of chip U2 is connected to one end of capacitor C18. The other end of capacitor C18 is connected to terminal 6 of chip U2, terminal 7 of chip U2, and one end of capacitor C17, and then grounded. The other end of capacitor C17 is connected to terminal 8 of chip U2. Terminal 1 of chip U3 is connected to one end of capacitor C19 and the operating voltage 5V, while the other end of capacitor C19 is grounded. Terminal 2 of chip U3 is connected to the other end of resistor R8, terminal 3 of chip U3 is connected to the other end of resistor R9, terminal 4 of chip U3 is connected to one end of capacitor C20 and the operating voltage VCC, and the other end of capacitor C20 is grounded. Terminal 5 of chip U3 is connected to one end of capacitor C22. The other end of capacitor C22 is connected to terminal 6 of chip U3, terminal 7 of chip U3, and one end of capacitor C21, and then grounded. The other end of capacitor C21 is connected to terminal 8 of chip U3.

7. The three-phase sensorless motor control system according to claim 3, characterized in that, The hardware overcurrent input circuit includes a resistor R10. One end of the resistor R10 is connected to terminal 5 of chip U1, one end of capacitor C8, one end of resistor R24, and one end of resistor R25. The other end of the resistor R10 is connected to the other end of capacitor C8 and then grounded. The other end of the resistor R23 is connected to the operating voltage 5V. The other end of the resistor R24 ​​is connected to one end of resistor RS2, one end of resistor RS1, and one end of resistor RS3 of the phase current sampling circuit.

8. The three-phase sensorless motor control system according to claim 3, characterized in that, The bus voltage detection circuit includes a capacitor C1. One end of the capacitor C1 is connected to terminal 5 of the chip U1 and one end of the resistor R7. The other end of the resistor R7 is connected to one end of the resistor R5 and one end of the resistor R6. The other end of the capacitor C1 is connected to the other end of the resistor R6 and then grounded. The other end of the resistor R5 is connected to the working voltage VCC terminal.

9. The three-phase sensorless motor control system according to claim 3, characterized in that, The BLDC drive circuit includes chip O1, chip O2, and chip O3. Terminal 1 of chip O1 is connected to one end of capacitor C10, one end of resistor R14, and the other end of resistor RS2 in the phase current sampling circuit. Terminal 2 of chip O1 is connected to the other end of capacitor C10, the other end of resistor R14, and one end of resistor R13. The other end of resistor R13 is connected to terminal 10 of chip O1. Terminal 3 of chip O1 is connected to one end of capacitor C9, one end of resistor R12, and the working voltage VCC terminal, respectively; terminal 4 of chip O1 is connected to the other end of capacitor C9, the other end of resistor R12, and one end of resistor R11, respectively; the other end of resistor R11 is connected to terminal 9 of chip U1. Terminal 5 of chip O1 is connected to terminal 6, terminal 7, and terminal 8 of chip O1, respectively. Terminal 1 of chip O2 is connected to one end of capacitor C12, one end of resistor R18, and the other end of resistor RS1 in the phase current sampling circuit; terminal 2 of chip O2 is connected to the other end of capacitor C12, the other end of resistor R18, and one end of resistor R17, and the other end of resistor R17 is connected to terminal 12 of chip U1. Terminal 3 of chip O2 is connected to one end of capacitor C11, one end of resistor R16, and the working voltage VCC terminal, respectively; terminal 4 of chip O2 is connected to the other end of capacitor C11, the other end of resistor R16, and one end of resistor R17, respectively; the other end of resistor R17 is connected to terminal 11 of chip U1. Terminal 5 of chip O2 is connected to terminals 6, 7, and 8 of chip O2, respectively. Terminal 1 of chip O3 is connected to one end of capacitor C14, one end of resistor R22, one end of resistor RS2, one end of resistor RS1, and one end of resistor RS3 of the phase current sampling circuit; terminal 2 of chip O3 is connected to the other end of capacitor C14, the other end of resistor R22, and one end of resistor R21, and the other end of resistor R21 is connected to terminal 14 of chip U1. Terminal 3 of chip O3 is connected to one end of capacitor C13, one end of resistor R20, and the working voltage VCC terminal, respectively; terminal 4 of chip O3 is connected to the other end of capacitor C13, the other end of resistor R20, and one end of resistor R19, respectively; the other end of resistor R19 is connected to terminal 13 of chip U1. Terminal 5 of chip O3 is connected to terminals 6, 7, and 8 of chip O3, respectively.

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