Leiditech recommends protection schemes and components for the motor control board circuit

1、 Circuit composition of motor control board

The motor control board is usually composed of main components such as power supply, microcontroller, driver, sensor, communication interface, protection circuit, etc

1. Power module: used to provide the power voltage and current required for the motor control circuit. Usually, it includes rectification circuits, filtering circuits, and voltage stabilizing circuits to ensure stable power supply for the motor control circuit.

2. Microcontroller (MCU): responsible for executing motor control algorithms, reading sensor data, and generating appropriate control signals. MCU is the brain of the motor control board, which contains a processor, memory, and various interfaces.

3. Driver module: used to drive the motor. Depending on the specific motor type (such as DC motor, stepper motor, or AC motor), the driver module can adopt different driving technologies and circuit designs. Common driver modules include motor driver chips, power amplifiers, MOSFET drivers, etc.

4. Sensor interface module: used to connect various sensors, such as position sensors, speed sensors, temperature sensors, etc., to obtain real-time feedback information related to motor operation.

5. Communication interface module: used for communication with external systems, such as serial communication interfaces (such as UART, SPI, I2C), Ethernet interfaces, or wireless communication interfaces (such as Wi Fi, Bluetooth). These interfaces can be used to receive external commands or send status information and diagnostic data.

6. Protection circuit: including overload protection, short circuit protection, overvoltage protection, etc., used to protect the motor and control board from accidental faults or abnormal situations.

The specific design of the motor control panel will vary depending on the application scenario, motor type and Functional requirement. When designing the motor control board, it is necessary to select appropriate components and circuit designs based on specific requirements to ensure that the motor can operate safely and stably, and meet the required control performance.

2、 What protection is required for the motor control board circuit

The commonly used protective components in motor control systems include the following:

1. Fuse: Used for overload protection. A fuse is a current protection device that opens the circuit when the current in the circuit exceeds the rated value, preventing equipment damage or fire hazards caused by excessive current.

2. Current Sensor: Used to monitor motor current. By installing a current sensor, the working current of the motor can be detected in real-time and compared with the set threshold to determine whether there are abnormal situations such as overload or short circuit, and trigger protection actions.

3. Temperature Sensor: Used to monitor the temperature of the motor or motor controller. High temperatures may cause the motor to overheat, causing damage or even catching fire. The temperature sensor can monitor temperature changes and issue an alarm or trigger a protection mechanism when the set temperature threshold is exceeded.

4. Overvoltage Protector: Used to prevent power overvoltage from damaging the motor control circuit. When the power supply voltage exceeds the set upper limit, the overvoltage protector will quickly cut off the circuit to protect the motor and related equipment.

5. Transient Voltage Suppressor (TVS): Used to resist sudden voltage peaks. Starting, stopping, or due to inductive coupling of the motor, transient voltage may be too high. TVS can provide a controllable low impedance path to direct the excessive transient voltage to ground and protect the circuit.

6. Various interface electrostatic surge protection ESD/TVS

In practical applications, the control board has various interfaces to connect to the outside, such as motor interface, encoder feedback interface, sensor feedback interface, serial communication or wireless module communication. These interfaces are easily damaged by surges when plugged in and out, so anti-static surge protection is required.

The above are common protections used in motor control systems. According to specific application requirements and circuit design, other types of protective components may also be used to ensure the safe and reliable operation of the motor and controller. When designing motor control systems, it is necessary to reasonably select and configure these protective components, and ensure that they can adapt to specific working environments and circuit requirements.

3、 Application scenario:

Motor control boards are widely used in daily life. Here are some common areas:

1. Household appliances: Motor control boards are widely used in household appliances, such as washing machines, air conditioners, refrigerators, televisions, etc. They are used to control the start stop, speed adjustment, and various functional operations of the motor.

2. Automotive industry: Motor control boards play an important role in the automotive industry. They are used to control multiple electric components in the vehicle, including engine control module, electric window, seat adjustment, fan and air conditioning control, etc.

3. Industrial automation: In the field of industrial production and automation control, motor control boards are widely used. They are used to control various mechanical equipment, such as machine tools, conveyor belts, robotic arms, and automated production lines.

4. Electric tools: electric tools such as electric drills, Bench grinder, lawn mowers, etc. use motor control boards to control the speed and operation mode of motors, providing higher efficiency and convenience.

5. Medical equipment: Motor control boards are also widely used in medical equipment. For example, medical syringes, blood analyzers, surgical instruments, etc. all require motor control boards to achieve precise control and operation.

In addition to the above fields, motor control boards also play a role in multiple fields such as aerospace, robotics technology, and energy management. They provide efficient, precise, and reliable motor control, making our lives more convenient and comfortable.

4、The protection scheme provided by Shanghai Leiditech Electronics for the motor control board

1. TVS/ESD/PPTC/MOV recommendations