Double brushless motor driver

Abstract

The utility model discloses a double brushless motor driver, belongs to the technical field of motor drivers, and solves the problems that if the working efficiency of an automatic cooker needs to be improved, the form of an integrated double-machine (one automatic cooker needs a mode of simultaneously driving a rotating motor and a stir-frying motor) is the most ideal state of the cooker; however, the current conventional brushless driver is corresponding to one direct current brushless motor. Comprising a communication circuit, a control circuit, a motor rotor position detection circuit, an inverter bridge driving circuit and a full-bridge inverter circuit. According to the utility model, the number of drivers is reduced, control wiring is reduced, multi-motor control flexibility is improved, production efficiency is improved, and cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of motor drivers, in particular to a dual brushless motor driver. Background Art

[0002] The three-phase brushless DC motor has a place in industrial applications with its excellent electrical properties. Its remarkable stability and low maintenance requirements make it surpass the traditional brushed motor and widely adopted in many fields. At the same time, in the large family of brushless motors, AC squirrel cage asynchronous motors are also considered as one of the members. Unwilling to be left behind, it has many unsatisfactory aspects in comparison with brushless DC motors despite its advantages of being brushless. These shortcomings include insufficient torque at startup, complex challenges during speed regulation, and relatively large volume at comparable power, especially in environments with higher requirements for motor size and performance. These problems have become obstacles to the development of asynchronous motors. It is these obstacles that have become catalysts for further innovation and development of brushless DC motors.

[0003] However, the key to the full functionality of brushless DC motors lies in the drivers that match them. These key electrical components not only ensure the efficiency and performance of the motors, but also vary in requirements in different application scenarios. A high degree of customization allows the drivers to meet specific operating requirements, thus finding their place in industrial automation, precision control and complex machinery. To this end, the development team is constantly innovating in technology to design high-performance brushless motor drivers that can adapt to diverse challenges. These drivers must not only achieve high energy efficiency and low noise operation, but also be highly adaptable, easy to install and can be seamlessly integrated into existing systems to optimize the overall equipment operating efficiency, reduce energy consumption, and ultimately gain an advantage for companies in the fierce market competition.

[0004] Especially when a device uses two or more motors, the number of drives will also increase. For example, an automatic cooking machine has a control panel for adjusting different cooking modes and settings, a heating device consisting of an electric heating element to provide the necessary heat source for cooking, a pot with a non-stick surface for placing and cooking ingredients, a mechanical or electric stirring system to simulate manual stir-frying movements, a series of temperature and time monitoring sensors for precise cooking process control, a brushless motor driving the stirring system and its related transmission mechanism, and a stable base component to ensure the stability of the machine during operation, and integrate multiple safety features, such as overheating protection and automatic shutdown functions, to ensure safety during use.

[0005] Especially in cooking machines, if you need to improve its working efficiency, then the integrated dual-machine form (an automatic cooking machine pot needs to be driven by two motors for rotation and frying at the same time) is the most ideal state for cooking machines. Currently, conventional brushless drivers correspond to a DC brushless motor.

[0006] Therefore, a dual brushless motor driver is proposed to solve or alleviate the above problems. Utility Model Content

[0007] The utility model aims to solve the shortcomings in the prior art and proposes a dual brushless motor driver.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A dual brushless motor driver, comprising a communication circuit, a control circuit, a motor rotor position detection circuit, an inverter bridge drive circuit, and a full-bridge inverter circuit;

[0010] The communication circuit is connected to the control circuit, and receives the signal from the host computer, converts it and transmits it to the control circuit;

[0011] The motor rotor position detection circuit is arranged in the brushless motor and is used to detect the detection signal generated by the rotor during the operation of the brushless motor and transmit it to the control circuit;

[0012] A control circuit, whose input end is connected to the communication circuit and the motor rotor position detection circuit, and whose output end is connected to the inverter bridge drive circuit. After receiving the external signal from the communication circuit, the control circuit controls the motor rotor position detection circuit to work, and after receiving the detection signal from the motor rotor position detection circuit, the control circuit outputs a three-phase full-bridge drive signal to the inverter bridge drive circuit;

[0013] The inverter bridge drive circuit has an output end for connecting to a brushless motor, and controls the brushless motor to work after receiving a three-phase full-bridge drive signal;

[0014] The protection circuit is connected to the input end of the control circuit and is used to sample the working current of the brushless motor and input a voltage analog signal to the control circuit. After receiving the voltage analog signal, the control circuit calculates the real-time working current of the brushless motor and controls the output mode of the three-phase full-bridge drive signal.

[0015] Preferably, the communication circuit comprises a U1 serial integrated communication drive circuit, and the U1 serial integrated communication drive circuit is connected to the control circuit and the host computer.

[0016] Preferably, the motor rotor position detection circuit comprises a Hall sensor arranged in the brushless motor, a resistor and a capacitor connected to the Hall sensor, and the output end of the Hall sensor is connected to the resistor and the capacitor and then connected to the input end of the control circuit.

[0017] Preferably, the control circuit includes an MCU processor U2, an oscillation circuit and a reset circuit composed of an XT1 crystal oscillator and a capacitor, and the XT1 crystal oscillator, the oscillation circuit and the reset circuit are all connected to the MCU processor U2.

[0018] Preferably, the inverter bridge drive circuit is a three-phase full-bridge drive circuit.

[0019] Preferably, the protection circuit is a current detection circuit, which includes an operational amplifier and a sampling resistor. The sampling resistor is used to be connected to a brushless motor, and the sampling resistor is connected to a control circuit via the operational amplifier.

[0020] Preferably, it also includes a power supply circuit, which supplies power to the control circuit, the communication circuit, the motor rotor position detection circuit, the inverter bridge drive circuit and the protection circuit.

[0021] The utility model has the following beneficial effects:

[0022] The utility model reduces the number of drivers, reduces control wiring, improves the flexibility of multi-motor control, improves production efficiency, saves costs, and other problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural block diagram of the utility model;

[0024] Figure 2 It is the wiring diagram of the communication circuit in the utility model;

[0025] Figure 3 It is the wiring diagram of the motor rotor position detection circuit in the utility model;

[0026] Figure 4 It is the wiring diagram of the inverter bridge drive circuit in the utility model;

[0027] Figure 5 It is the wiring diagram of the protection circuit in the utility model;

[0028] Figure 6 It is the wiring diagram of the power supply circuit in the utility model.

[0029] 1. Communication circuit; 2. Control circuit; 3. Power supply circuit; 4. Motor rotor position detection circuit; 5. Inverter bridge drive circuit; 6. Brushless motor; 7. Protection circuit. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0031] A dual brushless motor driver, comprising a communication circuit 1, a control circuit 2, a motor rotor position detection circuit 4, an inverter bridge drive circuit 5, and a full-bridge inverter circuit;

[0032] The communication circuit 1 is connected to the control circuit 2, and receives the signal from the host computer and converts and transmits it to the control circuit 2. The communication circuit 1 includes a U1 serial integrated communication drive circuit (specifically, an SP485 chip), and the U1 serial integrated communication drive circuit is connected to the control circuit 2 and the host computer;

[0033] Specifically, Figure 2 As shown,

[0034] The RO pin of the U1 serial integrated communication drive circuit is connected to the UART5 RX serial port of the host computer, the DI pin of the U1 serial integrated communication drive circuit is connected to the UART5 TX serial port of the host computer, the 8th pin of the U1 serial integrated communication drive circuit is connected to the 5V positive power, the 5th pin of the U1 serial integrated communication drive circuit is grounded, and a capacitor C15 is connected between the 8th pin and the 5th pin of the U1 serial integrated communication drive circuit. The 2nd and 3rd pins of the U1 serial integrated communication drive circuit are RE and DE respectively, both of which are connected to the RS485 RE5 serial port enable terminal is connected, pins 6 and 7 of U1 serial integrated communication drive circuit are both output pins, pin 7 of U1 serial integrated communication drive circuit is connected to the safety resistor RF1 and then connected to the pin 4 of XHB2.54 terminal, pin 6 of U1 serial integrated communication drive circuit is connected to the safety resistor RF2 and then connected to the pin 3 of XHB2.54 terminal, and pin 2 of XHB2.54 terminal is grounded, pin 1 of XHB2.54 terminal is powered, a TVS diode D2 (SMAJ6.8CA model) is connected between the safety resistor RF1 and pin 4 of XHB2.54 terminal and then grounded, a TVS diode D1 (SMAJ6.8CA model) is connected between the safety resistor RF2 and pin 3 of XHB2.54 terminal and then grounded, and the communication circuit 1 can be connected to the control circuit 2 through the XHB2.54 terminal.

[0035] The motor rotor position detection circuit 4 is arranged in the brushless motor 6, and is used to detect the detection signal generated by the rotor during the operation of the brushless motor 6 and transmit it to the control circuit 2. The motor rotor position detection circuit 4 includes a Hall sensor arranged in the brushless motor 6, a resistor and a capacitor connected to the Hall sensor, and the output end of the Hall sensor is connected to the resistor and the capacitor and then connected to the input end of the control circuit 2;

[0036] Specific wiring method, such as Figure 3 As shown, I will not go into details here. The circuit consists of a Hall sensor, a pull-up resistor, and a filter capacitor to ensure that the collected signal is clean and free of noise. Pay attention to the wiring sequence when wiring. The motor parameters all have the Hall line sequence, which is generally distinguished by color. The pull-up resistor provides a pull-up voltage to the Hall sensor inside the brushless motor 6. The output Hall signal is then connected to the control circuit 2 MCU signal detection input terminal through a resistor-capacitor circuit composed of resistors and capacitors. The MCU determines the rotor position of the brushless motor 6 by reading the level combination of the three signals.

[0037] The control circuit 2 has an input end connected to the communication circuit 1 and the motor rotor position detection circuit 4, and an output end connected to the inverter bridge drive circuit 5. After receiving the external signal from the communication circuit 1, the control circuit 2 controls the motor rotor position detection circuit 4 to work. After receiving the detection signal from the motor rotor position detection circuit 4, the control circuit 2 outputs a three-phase full-bridge drive signal to the inverter bridge drive circuit 5. The control circuit 2 includes an MCU processor U2, an oscillation circuit and a reset circuit composed of an XT1 crystal oscillator and a capacitor. The XT1 crystal oscillator, the oscillation circuit and the reset circuit are all connected to the MCU processor U2.

[0038] The specific wiring method is not described here in detail because the oscillation circuit and reset circuit composed of the MCU processor U2, XT1 crystal oscillator and capacitor are all existing technologies and are well known to those skilled in the art.

[0039] The inverter bridge drive circuit 5, whose output end is used to connect with the brushless motor 6, controls the brushless motor 6 to work after receiving the three-phase full-bridge drive signal. The inverter bridge drive circuit 5 is a three-phase full-bridge drive circuit with three independent half-bridge drives integrated inside, and has functions such as VCC undervoltage protection, direct protection, dead zone protection, and input signal filtering. Each inverter bridge drive circuit 5 is composed of six identical VMOS tubes, two VMOS tubes form a half-bridge circuit, and six VMOS tubes form three half-bridge circuits. The VMOS tubes in each half-bridge circuit are connected to a resistor stabilization circuit and a freewheeling circuit composed of a diode. The drive signal of each VMOS tube is respectively connected to the signal output end of the inverter bridge drive circuit 5, and there is also a bootstrap boost circuit composed of a diode and a capacitor outside to provide a drive voltage for the VMOS tube of the upper bridge arm of the three-phase inverter bridge circuit. The signal input end of the circuit is connected to the control circuit 2, and the MCU processor U2 outputs a three-phase full-bridge drive signal, which is then connected to the brushless motor 6 through the circuit to realize the opening and closing of the six VMOS tubes in the full-bridge inverter circuit. Since the three-phase full-bridge drive circuit is a prior art and is well known to those skilled in the art, it will not be described in detail here. The three-phase full-bridge drive circuit is Figure 4 shown.

[0040] The protection circuit 7 is connected to the input end of the control circuit 2, and is used to sample the working current of the brushless motor 6 and input a voltage analog signal to the control circuit 2. After receiving the voltage analog signal, the control circuit 2 calculates the real-time working current of the brushless motor 6 and controls the output mode of the three-phase full-bridge drive signal. The protection circuit 7 is a current detection circuit, which includes an operational amplifier and a sampling resistor. The sampling resistor is used to connect to the brushless motor 6, and the sampling resistor is connected to the control circuit 2 through the operational amplifier.

[0041] Specific as Figure 5 As shown, the protection circuit 7 is 2 groups of current detection circuits with the same structure. The current detection circuit is composed of an operational amplifier, a sampling resistor, and a resistor-capacitor filter circuit. The motor working current sampled by the sampling resistor is amplified by the operational amplifier, and the amplified current signal is converted into a voltage analog signal. Then, the voltage analog signal is input into the AD acquisition end of the MCU processor U2. The MCU processor U2 performs AD conversion and operation on the voltage analog signal to calculate the real-time working current of the brushless motor 6. When the current exceeds the actual maximum working current, the MCU processor U2 controls the output mode of the three-phase full-bridge drive signal to realize the motor overcurrent protection function.

[0042] The power supply circuit 3 is also included, and the power supply circuit 3 supplies power to the control circuit 2, the communication circuit 1, the motor rotor position detection circuit 4, the inverter bridge drive circuit 5 and the protection circuit 7. Figure 6 As shown, the power supply circuit 3 is composed of a reverse protection diode, a filter capacitor, a DC / DC converter, and an LDO linear regulator. The DC / DC converter provides working voltage for circuits such as the control circuit 2, the communication circuit 1, the motor rotor position detection circuit 4, and the inverter bridge drive circuit 5.

[0043] By adopting the above solution, the demand for drivers and the complexity of control wiring are greatly reduced, while the control flexibility of multiple brushless motors 6 is improved. This improvement not only improves the overall production efficiency, but also significantly saves costs.

[0044] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A dual brushless motor driver, comprising a communication circuit (1), a control circuit (2), a motor rotor position detection circuit (4), an inverter bridge drive circuit (5), and a full-bridge inverter circuit; The communication circuit (1) is connected to the control circuit (2), and receives a signal from the host computer, converts it, and transmits it to the control circuit (2); A motor rotor position detection circuit (4) is arranged in the brushless motor (6) and is used to detect a detection signal generated by the rotor during the operation of the brushless motor (6) and transmit the detection signal to the control circuit (2); A control circuit (2), whose input end is connected to the communication circuit (1) and the motor rotor position detection circuit (4), and whose output end is connected to the inverter bridge drive circuit (5); after receiving an external signal from the communication circuit (1), the control circuit (2) controls the motor rotor position detection circuit (4) to work; after receiving a detection signal from the motor rotor position detection circuit (4), the control circuit (2) outputs a three-phase full-bridge drive signal to the inverter bridge drive circuit (5); An inverter bridge drive circuit (5), whose output end is used to connect to a brushless motor (6), and controls the brushless motor (6) to work after receiving a three-phase full-bridge drive signal; A protection circuit (7) is connected to an input end of the control circuit (2) and is used to sample the working current of the brushless motor (6) and input a voltage analog signal to the control circuit (2); after receiving the voltage analog signal, the control circuit (2) calculates the real-time working current of the brushless motor (6) and controls the output mode of the three-phase full-bridge drive signal.

2. A dual brushless motor driver according to claim 1, characterized in that: The communication circuit (1) comprises a U1 serial integrated communication drive circuit, and the U1 serial integrated communication drive circuit is connected to the control circuit (2) and the host computer.

3. A dual brushless motor driver according to claim 1, characterized in that: The motor rotor position detection circuit (4) comprises a Hall sensor arranged in a brushless motor (6), a resistor and a capacitor connected to the Hall sensor, and the output end of the Hall sensor is connected to the resistor and the capacitor and then connected to the input end of the control circuit (2).

4. A dual brushless motor driver according to claim 1, characterized in that: The control circuit (2) comprises an MCU processor U2, an oscillation circuit composed of an XT1 crystal oscillator and a capacitor, and a reset circuit. The XT1 crystal oscillator, the oscillation circuit, and the reset circuit are all connected to the MCU processor U2.

5. A dual brushless motor driver according to claim 1, characterized in that: The inverter bridge drive circuit (5) is a three-phase full-bridge drive circuit.

6. A dual brushless motor driver according to claim 1, characterized in that: The protection circuit (7) is a current detection circuit, which comprises an operational amplifier and a sampling resistor. The sampling resistor is used to connect to the brushless motor (6), and the sampling resistor is connected to the control circuit (2) via the operational amplifier.

7. A dual brushless motor driver according to claim 1, characterized in that: It also includes a power supply circuit (3), wherein the power supply circuit (3) supplies power to the control circuit (2), the communication circuit (1), the motor rotor position detection circuit (4), the inverter bridge drive circuit (5) and the protection circuit (7).

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