Motor drive circuit and apparatus

Abstract

The utility model discloses a motor drive circuit and equipment relates to motor control technical field. The circuit includes: main control module, three -phase drive module is connected with main control module electricity, isolation module is connected with main control module electricity through photoelectric coupler, speed voltage acquisition module is connected with isolation module electricity, potentiometre adjustment module is connected with isolation module electricity, current acquisition module is connected with main control module electricity, communication module is connected with isolation module and edge gateway electricity respectively, and communication module is used for carrying out communication with isolation module and edge gateway, power module is connected with main control module, three -phase drive module, isolation module, speed voltage acquisition module, potentiometre adjustment module, current acquisition module and communication module electricity. The circuit can guarantee normal operation and normal communication of motor.

Description

Technical Field

[0001] This utility model relates to the field of motor control technology, and in particular to a motor drive circuit and device. Background Technology

[0002] In the field of intelligent motor control and condition monitoring, RS485 bus is commonly used to read motor operating data. However, complex electromagnetic interference (surge impact, electrostatic coupling) and electrical transients in industrial environments can easily damage circuits, leading to data interruptions or equipment failures. Furthermore, during motor operation, the real-time power may exceed the set maximum power, easily causing malfunctions. In addition, the offline configuration process for motor control parameters (maximum power threshold setting, speed adjustment, control gear switching, etc.) is cumbersome, and motor operating data (including real-time power, speed, cumulative running time, fault error information, etc.) is difficult to dynamically synchronize to the monitoring terminal, thus limiting the flexibility and real-time performance of control. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a motor drive circuit and device that can ensure the normal operation and communication of the motor.

[0004] In a first aspect, the motor drive circuit according to an embodiment of the present invention includes: Main control module; A three-phase drive module is electrically connected to the main control module, and the main control module is used to drive the motor through the three-phase drive module. The isolation module is electrically connected to the main control module via an optocoupler; The speed regulation voltage acquisition module is electrically connected to the isolation module. The speed regulation voltage acquisition module is used to acquire the speed regulation voltage of the motor and send it to the isolation module. A potentiometer adjustment module is electrically connected to the isolation module. The potentiometer adjustment module is used to collect the potential adjustment signal of the motor and send it to the isolation module. The isolation module sends the speed regulation voltage and the potential adjustment signal to the main control module. A current acquisition module is electrically connected to the main control module. The current acquisition module is used to acquire the average current of the motor and send it to the main control module. A communication module is electrically connected to both the isolation module and the edge gateway, and the communication module is used to communicate with both the isolation module and the edge gateway. The power supply module is electrically connected to the main control module, the three-phase drive module, the isolation module, the speed regulation voltage acquisition module, the potentiometer adjustment module, the current acquisition module, and the communication module. The power supply module provides operating power to the main control module, the three-phase drive module, the isolation module, the speed regulation voltage acquisition module, the potentiometer adjustment module, the current acquisition module, and the communication module. The power supply module also includes a voltage acquisition unit, which is used to acquire the voltage of the motor and send it to the main control module.

[0005] According to some embodiments of the present invention, the communication module includes: The communication chip has its signal terminal electrically connected to the isolation module via a first current-limiting resistor, its bus terminal connected to the edge gateway via a second current-limiting resistor, its receiver output terminal connected in parallel with a first capacitor, and its power supply terminal connected in parallel with a second capacitor.

[0006] According to some embodiments of the present invention, the potentiometer adjustment module includes: A potentiometer, one end of which is electrically connected to the power module, and the other end of which is grounded. The sliding terminal of the potentiometer is electrically connected to one end of a first resistor, and the other end of the first resistor is electrically connected to the isolation module. The other end of the first resistor is also grounded through a third capacitor.

[0007] According to some embodiments of this utility model, the current acquisition module includes: The second resistor, one end of which is electrically connected to the three-phase drive module; A third resistor, one end of which is electrically connected to the power module, and the other end of which is electrically connected to one end of the second resistor; A fourth capacitor, one end of which is electrically connected to the other end of the third resistor, and the other end of the fourth capacitor is grounded; An operational amplifier is provided, wherein the inverting input terminal of the operational amplifier is electrically connected to the other end of the second resistor through a fourth resistor, the non-inverting input terminal of the operational amplifier is connected to a reference voltage, the output terminal of the operational amplifier is connected to the inverting input terminal of the operational amplifier through a fifth resistor, and the output terminal of the operational amplifier is also electrically connected to the main control module through a filter circuit.

[0008] According to some embodiments of this utility model, a temperature detection module is also included. The temperature detection module is electrically connected to the main control module and the three-phase drive module respectively. The temperature detection module is used to collect the temperature of the motor and send it to the main control module.

[0009] According to some embodiments of this utility model, it also includes several error reporting interface modules, which are electrically connected to the isolation module.

[0010] According to some embodiments of the present invention, each of the error reporting interface modules includes: The transistor has its base electrically connected to the isolation module via a sixth resistor, its collector electrically connected to the power module via a seventh resistor, its emitter grounded, and its collector connected to the corresponding interface.

[0011] Secondly, the motor drive device according to the embodiments of the present invention includes the motor drive circuit as described in the first aspect embodiment.

[0012] The motor drive circuit and device according to the embodiments of this utility model have at least the following beneficial effects: By setting a current acquisition module and a voltage acquisition unit, the voltage and current of the motor can be acquired in real time, thereby calculating the real-time power of the motor and ensuring that the real-time power of the motor is within the limit range; when the real-time power of the motor exceeds the set range, it can be adjusted by the potentiometer adjustment module. During adjustment, the main control module acquires the speed regulation voltage acquired by the speed regulation voltage acquisition module and the potential adjustment signal from the potentiometer adjustment module, thereby determining the speed regulation signal based on the speed regulation voltage and the potential adjustment signal, and adjusting the speed of the motor according to the speed regulation signal, thereby changing the real-time power of the motor. At the same time, by setting a communication module, it can communicate with the edge gateway, and then with the Mthings platform. When the Mthings platform issues a configuration command, the edge gateway can convert the configuration command from the MQTT protocol to the Modbus protocol, and then send the configuration command to the communication module through the RS485 bus, thereby realizing the configuration of the motor's operating parameters or the real-time reading of the motor's operating data, thereby realizing the flexibility and real-time performance of motor control. This communication module can avoid electromagnetic interference (including surge impact and electrostatic coupling, etc.) in the industrial field.

[0013] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0014] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 The circuit diagrams of the main control module and the three-phase drive module in this embodiment of the utility model are shown. Figure 2 This is a circuit diagram of the current acquisition module and temperature detection module according to an embodiment of the present utility model; Figure 3 The circuit diagrams for the isolation module, speed regulation voltage acquisition module, and potentiometer adjustment module are shown in this embodiment of the present invention. Figure 4 This is a circuit diagram of the error reporting interface module and the communication module according to an embodiment of the present utility model; Figure 5 This is a circuit diagram of the power supply module according to an embodiment of the present invention. Detailed Implementation

[0015] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. The step numbers in the following embodiments are set only for ease of explanation, and there is no limitation on the order between the steps. The execution order of each step in the embodiments can be adaptively adjusted according to the understanding of those skilled in the art.

[0016] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0017] The terms "first," "second," "third," and "fourth," etc., used in the specification, claims, and accompanying drawings of this utility model are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0018] In this invention, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0019] In the field of intelligent motor control and condition monitoring, RS485 bus is commonly used to read motor operating data. However, complex electromagnetic interference (surge impact, electrostatic coupling) and electrical transients in industrial environments can easily damage circuits, leading to data interruptions or equipment failures. Furthermore, during motor operation, the real-time power may exceed the set maximum power, easily causing malfunctions. In addition, the offline configuration process for motor control parameters (maximum power threshold setting, speed adjustment, control gear switching, etc.) is cumbersome, and motor operating data (including real-time power, speed, cumulative running time, fault error information, etc.) is difficult to dynamically synchronize to the monitoring terminal, thus limiting the flexibility and real-time performance of control.

[0020] To address this, this utility model provides a motor drive circuit and device. By setting a current acquisition module and a voltage acquisition unit, the voltage and current of the motor can be acquired in real time, thereby calculating the real-time power of the motor and ensuring that the real-time power of the motor is within the limit range. When the real-time power of the motor exceeds the set range, it can be adjusted by a potentiometer adjustment module. During adjustment, the main control module acquires the speed regulation voltage acquired by the speed regulation voltage acquisition module and the potential adjustment signal from the potentiometer adjustment module, thereby determining the speed regulation signal based on the speed regulation voltage and potential adjustment signal, and adjusting the motor speed according to the speed regulation signal, thereby changing the real-time power of the motor. Simultaneously, by setting a communication module, it can communicate with an edge gateway, and then with the Mthings platform. When the Mthings platform issues configuration commands, the edge gateway can convert the configuration commands from the MQTT protocol to the Modbus protocol, and then send the configuration commands to the communication module via the RS485 bus, thereby enabling the configuration of motor operating parameters or the real-time reading of motor operating data, thus achieving flexibility and real-time motor control. This communication module can avoid electromagnetic interference (including surge impact and electrostatic coupling, etc.) in industrial environments.

[0021] The motor control method of this utility model embodiment will now be described in detail with reference to the accompanying drawings.

[0022] On the one hand, this utility model embodiment proposes a motor drive circuit, referring to... Figures 1 to 5The circuit includes: a main control module 100, a three-phase drive module 200, an isolation module 300, a speed regulation voltage acquisition module 400, a potentiometer adjustment module 500, a current acquisition module 600, a communication module 800, and a power supply module. The three-phase drive module 200 is electrically connected to the main control module 100, and the main control module 100 drives the motor through the three-phase drive module 200. The isolation module 300 is electrically connected to the main control module 100 via an optocoupler. The speed regulation voltage acquisition module 400 is electrically connected to the isolation module 300, and is used to acquire the motor's speed regulation voltage and send it to the isolation module 300. The potentiometer adjustment module 500 is electrically connected to the isolation module 300, and is used to acquire the motor's potential adjustment signal and send it to the isolation module 300. The isolation module 300 sends the speed regulation voltage and potential adjustment signal to the main control module 100, enabling the main control module 100 to receive the speed regulation signal. The motor's real-time power is adjusted according to the speed control signal; the current acquisition module 600 is electrically connected to the main control module 100, and the current acquisition module 600 is used to acquire the average current of the motor and send it to the main control module 100; the communication module 800 is electrically connected to the isolation module 300 and the edge gateway respectively, and the communication module 300 is used to communicate with the isolation module 300 and the gateway; the power supply module is electrically connected to the main control module 100, the three-phase drive module 200, the isolation module 300, the speed control voltage acquisition module 400, the potentiometer adjustment module 500, the current acquisition module 600 and the communication module 800, and the power supply module is used to provide working power to the main control module 100, the three-phase drive module 200, the isolation module 300, the speed control voltage acquisition module 400, the potentiometer adjustment module 500 and the current acquisition module 600. The power supply module also includes a voltage acquisition unit 710, which is used to acquire the motor voltage and send it to the main control module 100.

[0023] Specifically, the specific circuit of the main control module 100 is as follows: Figure 1 As shown, in this example, the main control module includes a microcontroller U2, which can be of the SC32F5432RE or similar model. The main control module is used to control the working status of other modules.

[0024] The specific circuit of the three-phase drive module 200 is as follows: Figure 1As shown, in this example, the three-phase drive module 200 includes a drive chip U1, which can be of the SDM202G60 model. The main control module is connected to the three-phase drive module 200 through UH, UL, VH, VL, WH, and WL signals. The UH signal is connected to the drive chip U1 through resistor R2 and capacitor C3. The UL signal is connected to the drive chip U1 through resistor R3 and capacitor C6. The VH signal is connected to the drive chip U1 through resistor R4 and capacitor C8. The VL signal is connected to the drive chip U1 through resistor R6 and capacitor C9. The WH signal is connected to the drive chip U1 through resistor R8 and capacitor C11. The WL signal is connected to the drive chip U1 through resistor R10 and capacitor C14. The three-phase drive signal sent by the main control module 100 is filtered and then sent to the drive chip U1, enabling the three-phase drive module 200 to drive the motor.

[0025] like Figure 2 As shown, in some embodiments of this application, the current acquisition module 600 includes: a second resistor R14, a third resistor R11, a fourth capacitor C15, and an operational amplifier U3. One end of the second resistor R14 is electrically connected to the three-phase drive module 200; one end of the third resistor R11 is electrically connected to the power supply module (15V voltage); and the other end of the third resistor R11 is electrically connected to one end of the second resistor R14. One end of the second capacitor C15 is electrically connected to the other end of the third resistor R11, and the other end of the fourth capacitor C15 is grounded. The inverting input terminal of the operational amplifier U3 is electrically connected to the other end of the second resistor R14 via the fourth resistor R29; the non-inverting input terminal of the operational amplifier U3 is connected to a reference voltage; the output terminal of the operational amplifier U3 is connected to the inverting input terminal of the operational amplifier U3 via the fifth resistor R19; and the output terminal of the operational amplifier U3 is also electrically connected to the main control module 100 via a filter circuit. Specifically, as shown... Figure 2 As shown, the reference voltage is obtained by dividing the 5V voltage through resistors R26 and R28, and then input to the non-inverting input of operational amplifier U3. The filter circuit, consisting of resistor R23 and capacitor C21, is used to filter the output signal of operational amplifier U3. After obtaining the measured current (R_Ref) from the three-phase drive module 200, the measured current is sampled by the fourth resistor R29 to generate a voltage drop V. sample =I load ×2.7kΩ, this voltage is input to the inverting input of operational amplifier U3 through an implicit trace; simultaneously, a voltage divider network consisting of resistors R26 and R28 generates a 0.5V reference voltage from the 5V power supply, which is input to the non-inverting input of operational amplifier U3. Operational amplifier U3 forms an inverting proportional amplifier circuit through the fifth resistor R19, outputting a signal with a gain of 10: Vout(U3) = 10×(0.5) The signal (Vsample) is filtered for noise by a filter circuit consisting of resistor R23 and capacitor. The final output "average current" signal (DC component) is directly connected to the ADC acquisition pin of the main control module 100, enabling the main control module 100 to acquire the average current of the motor. Through the current acquisition module 600, the main control module 100 can acquire the average current of the motor in real time.

[0026] like Figure 2 As shown, in some embodiments of this application, the motor drive circuit further includes a temperature detection module 900. The temperature detection module 900 is electrically connected to the main control module 100 and the three-phase drive module 200, respectively. The temperature detection module 900 is used to collect the motor temperature and send it to the main control module 100. Specifically, the temperature detection module includes a resistor R16, a capacitor C16, and a thermistor R17. One end of the resistor R16 is connected to a 5V voltage, and the other end of the resistor R16 is connected to one end of the thermistor R17, with the other end of the thermistor R17 grounded. One end of the capacitor C16 is connected to the other end of the resistor R16, with the other end of the capacitor C16 grounded. The resistance of the thermistor R17 changes with temperature, causing a change in the voltage between the resistor R16 and the thermistor R17. The main control module 100 can detect the temperature change of the motor by detecting the signal from the temperature detection module 900. By detecting the temperature through the temperature detection module 900, the motor temperature is prevented from becoming too high, ensuring the safe operation of the system.

[0027] The circuit diagram of isolation module 300 is as follows: Figure 3 As shown, in this example, the isolation module 300 includes an isolation chip U5, an optocoupler OPT1, and an optocoupler OPT2. The isolation chip U5 communicates with the main control module 100 through optocouplers OPT1 and OPT2 to achieve signal isolation. The isolation chip U5 sends a signal U1T to optocoupler OPT1, which in turn sends an RX signal to the main control module 100. The main control module sends a signal TX to optocoupler OPT2, which in turn sends a U1R signal to the isolation module 300. The isolation module achieves signal isolation through optocouplers OPT1 and OPT2.

[0028] The circuit diagram of the speed regulation voltage acquisition module 400 is as follows: Figure 3As shown, in this example, the speed control voltage acquisition module includes resistors R35, R38, R39, R41, R43, capacitors C27 and C29. One end of resistor R35 is connected to a 5V-2V voltage, and the other end of resistor R35 is connected to one end of resistor R41. The other end of resistor R41 is grounded. One end of resistor R39 is connected to the connection point between resistors R35 and R41, and the other end of resistor R39 is connected to the isolation chip U5 via VSP_PWM. One end of capacitor C27 is connected to the other end of resistor R39, and the other end of capacitor C27 is grounded. One end of resistor R38 is connected to the connection point between resistors R35 and R41, and the other end of resistor R38 is connected to one end of capacitor C29. The other end of capacitor C29 is grounded. One end of resistor R43 is connected to the other end of resistor R38, and the other end of resistor R43 is grounded. The speed control voltage acquisition module 400 is used to acquire the speed control voltage of the motor and feed it back to the isolation module 300.

[0029] The circuit diagram of potentiometer adjustment module 500 is as follows: Figure 3 As shown, in this example, the potentiometer adjustment module 500 includes a potentiometer RP1. One end of the potentiometer RP1 is electrically connected to the power supply module (5V-2V), and the other end of the potentiometer RP1 is grounded. The sliding terminal of the potentiometer RP1 is electrically connected to one end of the first resistor R42, and the other end of the first resistor R42 is electrically connected to the isolation module 300. The other end of the first resistor R42 is also grounded through the third capacitor C28. The potentiometer adjustment module 500 can change the power of the motor by adjusting the potentiometer RP1. Simultaneously, the potentiometer adjustment module is also used to send a potential adjustment signal to the isolation chip U5. After receiving the speed regulation voltage and the potential adjustment signal, the isolation chip U5 calculates the motor speed regulation signal and sends it to the main control module 100, so that the main control module 100 changes the motor speed according to the speed regulation signal, thereby adjusting the motor power.

[0030] The circuit diagram of the communication module 800 is as follows: Figure 4As shown, the communication module 800 includes a communication chip U4, which can be a BL3085 / ST485 or similar model. The signal terminal of the communication chip U4 is electrically connected to the isolation module 300 through a first current-limiting resistor (R33, R36, R37). The bus terminal of the communication chip U4 is connected to the edge gateway through a second current-limiting resistor (R31, R40). A first capacitor C24 is also connected in parallel to the receiver output terminal (RO terminal) of the communication chip U4, and a second capacitor C25 is connected in parallel to the power supply terminal (pin 8) of the communication chip U4. Specifically, the communication module 800 employs reserved double-layer protection, which can withstand industrial-grade surges and electrostatic discharge (such as lightning strikes and ESD) by reserving TVS diodes (TVS3 and TVS4) at the A and B bus terminals. Meanwhile, the communication module 800 features end-to-end current limiting. A 100Ω resistor is connected in series at the signal terminals (RX0, TX0, DE0), and a 10Ω resistor is connected in series at the bus terminals (A / B). This end-to-end current limiting from signal input to the communication chip U4 and then to the bus output protects the hardware. Furthermore, tiered filtering is employed for interference suppression. A second capacitor C2 is connected in parallel at the VCC terminal of the ST485 to filter out high-frequency power supply noise. A first capacitor C24 is connected in parallel at the RX0 signal terminal to reduce ground noise coupling. A 10Ω resistor is connected in series at the A and B bus terminals to reduce the impact of bus surges on the chip.

[0031] like Figure 4 As shown, in some embodiments of this application, the motor drive circuit further includes an error reporting interface module 1000, which is electrically connected to the isolation module 300. The error reporting interface module 1000 is used to shut down the corresponding part of the system when an error occurs, ensuring system safety. In this example, the error reporting interface module 1000 includes several error reporting interface units. Each error reporting interface unit includes a transistor (Q1 / Q2 / Q3 / Q4 / Q5 / Q6). The base of the transistor is electrically connected to the isolation module 300 through a sixth resistor (R48 / R49 / R50 / R57 / R58 / R59), the collector of the transistor is electrically connected to the power supply module through a seventh resistor (R44 / R45 / R46 / R52 / R53 / R54), the emitter of the transistor is grounded, and the collector of the transistor is connected to interface P4, which is connected to corresponding components. When an interface reports an error, the corresponding error reporting interface unit is set high.

[0032] The circuit diagram of the power module is as follows: Figure 5As shown, the power module connects to an external AC power source via L1 and N1, and rectifies and filters the AC power through a filter and rectifier circuit. It then converts the AC power to obtain voltages VM, 15V, 12V, 5V, and 5V-2, providing the required operating voltages for other modules. The power module also includes a voltage acquisition unit 710, which comprises resistors R68, R75, and R77, and a capacitor C51. One end of resistor R68 is connected to the voltage VM, and the other end of resistor R68 is connected to one end of resistor R75. The other end of resistor R75 is connected to one end of resistor R77, and the other end of resistor R77 is grounded. One end of capacitor C51 is connected to one end of resistor R77, and the other end of capacitor C51 is grounded. A voltage acquisition unit is formed by connecting resistors R68 and R75 (680k+680k) in series to divide the voltage, followed by resistor R77 (15K) and capacitor C251 in parallel. This unit acquires the bus voltage VV and sends it to the main control module 100. The main control module can calculate the motor power based on P (power) = U (bus voltage) * I (average current).

[0033] According to the motor drive circuit of this application embodiment, by setting a current acquisition module and a voltage acquisition unit, the voltage and current of the motor can be acquired in real time, thereby calculating the real-time power of the motor and ensuring that the real-time power of the motor is within the limit range. When the real-time power of the motor exceeds the set range, it can be adjusted by the potentiometer adjustment module 500. During adjustment, the main control module 100 acquires the speed regulation voltage acquired by the speed regulation voltage acquisition module 400 and the potential adjustment signal of the potentiometer adjustment module 500, thereby determining the speed regulation signal based on the speed regulation voltage and the potential adjustment signal, and adjusting the motor speed according to the speed regulation signal, thereby changing the real-time power of the motor. At the same time, by setting a communication module, it can communicate with the edge gateway, and then with the Mthings platform. When the Mthings platform issues a configuration command, the edge gateway can convert the configuration command from the MQTT protocol to the Modbus protocol, and then send the configuration command to the communication module through the RS485 bus, thereby realizing the configuration of the motor's operating parameters or the real-time reading of the motor's operating data, thereby realizing the flexibility and real-time performance of motor control. This communication module can avoid electromagnetic interference (including surge impact and electrostatic coupling, etc.) in the industrial field.

[0034] Meanwhile, utilizing this motor drive circuit, and with the communication module 800 employing the BL3085 / ST485 chip, interaction between the motor and the Mthings platform can be achieved. This overcomes the communication compatibility challenges when integrating the Modbus protocol with the Mthings platform, while ensuring the security of motor parameters and operating data during transmission, thus improving the overall efficiency of industrial motor control and data management. The Mthings platform allows for convenient configuration of motor drive parameters and synchronous monitoring of motor operating data.

[0035] Secondly, embodiments of this application also propose a motor drive device, which includes the aforementioned motor drive circuit. It should be noted that all content of the above-described embodiments is applicable to the motor drive device of this embodiment, and the technical effects of both are the same.

[0036] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A motor drive circuit, characterized in that, include: Main control module; A three-phase drive module is electrically connected to the main control module, and the main control module is used to drive the motor through the three-phase drive module. The isolation module is electrically connected to the main control module via an optocoupler; The speed regulation voltage acquisition module is electrically connected to the isolation module. The speed regulation voltage acquisition module is used to acquire the speed regulation voltage of the motor and send it to the isolation module. A potentiometer adjustment module is electrically connected to the isolation module. The potentiometer adjustment module is used to collect the potential adjustment signal of the motor and send it to the isolation module. The isolation module sends the speed regulation voltage and the potential adjustment signal to the main control module. A current acquisition module is electrically connected to the main control module. The current acquisition module is used to acquire the average current of the motor and send it to the main control module. A communication module is electrically connected to both the isolation module and the edge gateway, and the communication module is used to communicate with both the isolation module and the edge gateway. The power supply module is electrically connected to the main control module, the three-phase drive module, the isolation module, the speed regulation voltage acquisition module, the potentiometer adjustment module, the current acquisition module, and the communication module. The power supply module provides operating power to the main control module, the three-phase drive module, the isolation module, the speed regulation voltage acquisition module, the potentiometer adjustment module, the current acquisition module, and the communication module. The power supply module also includes a voltage acquisition unit, which is used to acquire the voltage of the motor and send it to the main control module.

2. The motor drive circuit according to claim 1, characterized in that, The communication module includes: The communication chip has its signal terminal electrically connected to the isolation module via a first current-limiting resistor, its bus terminal connected to the edge gateway via a second current-limiting resistor, its receiver output terminal connected in parallel with a first capacitor, and its power supply terminal connected in parallel with a second capacitor.

3. The motor drive circuit according to claim 1, characterized in that, The potentiometer adjustment module includes: A potentiometer, one end of which is electrically connected to the power module, and the other end of which is grounded. The sliding terminal of the potentiometer is electrically connected to one end of a first resistor, and the other end of the first resistor is electrically connected to the isolation module. The other end of the first resistor is also grounded through a third capacitor.

4. The motor drive circuit according to claim 1, characterized in that, The current acquisition module includes: The second resistor, one end of which is electrically connected to the three-phase drive module; A third resistor, one end of which is electrically connected to the power module, and the other end of which is electrically connected to one end of the second resistor; A fourth capacitor, one end of which is electrically connected to the other end of the third resistor, and the other end of the fourth capacitor is grounded; An operational amplifier is provided, wherein the inverting input terminal of the operational amplifier is electrically connected to the other end of the second resistor through a fourth resistor, the non-inverting input terminal of the operational amplifier is connected to a reference voltage, the output terminal of the operational amplifier is connected to the inverting input terminal of the operational amplifier through a fifth resistor, and the output terminal of the operational amplifier is also electrically connected to the main control module through a filter circuit.

5. The motor drive circuit according to claim 1, characterized in that, It also includes a temperature detection module, which is electrically connected to the main control module and the three-phase drive module respectively. The temperature detection module is used to collect the temperature of the motor and send it to the main control module.

6. The motor drive circuit according to claim 1, characterized in that, It also includes an error reporting interface module, which is electrically connected to the isolation module.

7. The motor drive circuit according to claim 6, characterized in that, The error reporting interface module includes several error reporting interface units, each of which includes: The transistor has its base electrically connected to the isolation module via a sixth resistor, its collector electrically connected to the power module via a seventh resistor, its emitter grounded, and its collector connected to the corresponding interface.

8. A motor drive device, characterized in that, Includes the motor drive circuit as described in any one of claims 1-7.

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