Classification and Functional Role of Frequency Converter

Converter is a kind of power electronic equipment, which can adjust the voltage and frequency of power output by switching control of electronic devices from fixed frequency and fixed voltage AC power supply, so as to realize the control of motor speed. Simply put, an inverter can convert an AC power supply into a controllable power supply so that the motor can run at different speeds.

According to its application areas, functional characteristics and circuit structure and other different ways of categorization, the frequency converter can be divided into the following categories:

    1. according to the application field classification: frequency converter can be divided into industrial frequency converter, household frequency converter, elevator frequency converter, air conditioning frequency converter and other different types. Different fields of inverter have different characteristics and application needs.

    2.according to the power classification: inverter can be divided into low-voltage inverter, medium-voltage inverter and high-voltage inverter. Different power inverter is suitable for different power motors, and its output voltage and frequency range is also different.

    3.according to the control mode classification: inverter can be divided into two types of V / F control and vector control, V / F control is a simple control mode, suitable for general constant torque load; vector control is more accurate, suitable for constant power loads and the need for precise control of the application.

    4.according to the circuit structure classification: inverter can be divided into thyristor inverter, IGBT inverter, MOSFET inverter and other different types. Different types of inverters in the output voltage and frequency, response speed, efficiency and reliability and other differences.

    5.according to the number of control classification: inverter can be divided into single inverter and multi-inverter two types. Single inverter can only control a motor, multi-frequency inverter can control multiple motors at the same time, suitable for motor control system complexity, high precision requirements of the occasion.

Different types of inverters have different characteristics and application requirements, with effective protection of the current sensor selection is critical, FREESOR sensor B,F,K three series of products not only has a strong anti-interference ability, response time, bandwidth also has certain advantages.

Converter has important functions and roles in motor control, which can realize precise control of motor speed, energy saving and consumption reduction, improve the stability of motor operation, expand the application range of motor, and realize multiple operation modes and automatic protection, etc. It is an indispensable device in the fields of industrial production and machinery manufacturing. It mainly includes the following aspects:

　　1.to achieve precise control of motor speed: frequency converter can control the output frequency and voltage to achieve precise control of motor speed, which can adapt to different loads and work scenarios and improve production efficiency and product quality.

　　2.Energy saving and consumption reduction: the traditional motor control method controls the motor speed by adjusting the power supply voltage, but this way will waste a lot of energy. And the frequency converter can reduce the energy loss by controlling the frequency of the motor speed, saving energy and reducing the electricity bill.

　　3.Improve the stability of motor operation: frequency converter can control the process of motor starting and running, avoid motor damage caused by overload or overcurrent, improve the stability of motor operation.

　　4.Expand the scope of application of the motor: through the control of the frequency converter, it can realize the adaptability of the motor in different working scenes, expanding the scope of application of the motor.

　　5.the realization of a variety of operating modes: frequency converter can realize a variety of operating modes, such as forward, reverse, fast start, deceleration and stop, etc., can be adapted to different work requirements.

　　6.automatic protection: inverter built-in a variety of protection mechanisms, such as over-current protection, over-voltage protection, under-voltage protection, etc., can automatically monitor and protect the motor, to avoid damage to the motor due to overload, short circuit and other reasons.