frequency converter
A frequency converter is an electronic device that is used to regulate the frequency of the electric current, and thus also the speed of rotation of the asynchronous electric motor. Its main task is to change the frequency of the current, which has a direct effect on the engine speed. In this way, it is possible to regulate the speed of movement of machines and equipment, thereby saving energy and improving efficiency.
Frequency converters are widely used in various applications, especially in industrial and commercial environments. Their main uses include:
Speed regulation of motors: Thanks to frequency converters, it is possible to regulate the speed of motors, which enables adaptation of the performance of machines and equipment as needed and changes in operating conditions.
Energy savings: Frequency converters enable the operation of motors and equipment to be optimized, resulting in energy savings and lower operating costs.
Soft starting: With the help of frequency converters, it is possible to realize soft starting of motors, which reduces the impact load and extends the life of the equipment.
Pressure and flow regulation: Frequency converters are also used for pressure and flow regulation in hydraulic and pneumatic systems.
There are several types of frequency converters that differ in their properties and applications:
Voltage Source Inverter (VSI): This type of inverter regulates the output frequency by changing the output voltage. It is suitable for applications where higher voltage and lower current levels are required.
Current source inverter (CSI): This type of inverter regulates the output frequency by changing the output current. It is suitable for applications where higher current levels and lower voltages are required.
Voltage Current Source Inverter (VCSI): This type of inverter is a combination of VSI and CSI and enables variable regulation of the output voltage and current.
Inverter with PWM control (Pulse Width Modulation, PWM): This type of inverter regulates the frequency using a PWM signal that controls the ratio between the off and on states of the inverter.
The choice of a specific type of frequency converter depends on the specific application and the regulation and performance requirements. Each type of inverter has its advantages and limitations, so it is important to choose the right type for the application.
