The frequency conversion speed control system used in the air cooler is generally composed of sensors, transmitters, regulators, controllers, inverters, motors and controlled equipment. Ningbo air cooler, Ningbo air cooler

    The sensor is used to sense the controlled parameter in the controlled device. It can be flow, pressure, temperature, humidity, gas content, etc. Generally, the controlled parameter is converted into an electrical signal by the sensor.

    The function of the transmitter is to amplify and shape the electrical signal obtained by the sensor, and then uniformly adjust it to a regular voltage, such as 0V ~ 5V or current signal 4mA ~ 20mA as the input of the regulator.

    Regulators or controllers, they are actually a micro-control system composed of a single-chip microcomputer. It has functions of calculation, judgment and logic analysis. It has digital and analog input terminals, digital and analog output terminals, which can implement control laws such as PID or fuzzy control under the control of software. It can also use digital output ports to direct the switching between frequency modulation and power frequency of several motors, Various operations such as turning on or off related parts of the controlled equipment.

    The inverter is a kind of control equipment that uses the intelligent control technology of electronic devices to change the AC voltage with a fixed frequency and frequency into an AC voltage with a variable frequency and frequency. The variable frequency and voltage AC power used by the inverter to drive the motor can reach the speed regulation of the motor. Inverter is generally composed of power supply part, output part, control part, protection part, display part and given part. The capacity ranges from tens of watts to hundreds of kilowatts, and there are both three-phase and single-phase. For more than ten years, the reliability of inverters has become stronger and stronger, the prices are getting lower and lower, and the fields of application have become wider and wider.

    The electric motor and the controlled equipment together constitute the power source and execution mechanism of the production process to ensure the normal production or system work. The control system described above is a closed-loop control system. Sometimes, for some simple control systems, open-loop control systems are also used. In this case, the sensors, transmitters, and regulators are held by human features and brains. After the deviation of the controlled parameters of the system is observed or felt, the manual setting method is used to adjust the given value of the inverter to change the speed of the motor, thereby achieving the purpose of controlling the controlled parameters.