A frequency inverter is an electrical device that changes the current and transforms DC (Direct Current) into AC (Alternating Current). It is specially designed and used to control the speed of the AC induction motor without affecting the electric consumption, impedance, torque, and magnetic flux of the motor.
It’s integrated into an operator interface to receive the required speed control commands and also enables the conversion of an electrical variable current. Prominent frequency inverter suppliers provide the best quality of frequency inverter to control the AC speed. The frequency inverter transforms an AC current with a certain frequency into a voltage with variable amplitude and frequency.
It can power a wide variety of equipment including three-phase motor pumps and air conditioners. In three-phase motors, the speed and torque of the AC motor is controlled by varying the frequency that doesn’t restrict the performance of a three-phase motor; it improves its efficiency. These motors are often used in an industrial environment and are especially common in the drive technology field.
Technical Setup of a Frequency Inverter
A frequency inverter consists of a rectifier that supplies intermediate DC current and an inverter which acts upon it. It also allows the current supplied to be converted to a specified voltage.
Design/Types of Frequency Inverter
Volt-Hertz Frequency Inverter
It’s the simplest type of frequency inverter. In this, the voltage and the frequency control follow a linear relationship. And if a Volt-Hertz frequency inverter is used for motor control, there are certain additions. In this inverter, the load on the motor directly affects the resultant usable speed. And where the range of speed variance is not large, or if there is no direct stating load, a Volt-Hertz frequency inverter is used for motor control.
Vector-Controlled Frequency Inverter
This frequency inverter doesn’t control an AC motor using a voltage or frequency ration, but by varying the motor input frequency and voltage. The main advantage of this method is optimum torque control and it also offers other advantages too.
Frequency inverter offers real parametric control more than efficient. Many frequency inverter suppliers and manufacturers develop high-quality electronic frequency inverters and adapt their general functions to particular applications. With control panels, LED indicators, and programmable frequency inverter, many parameters and functions such as start and stop ramps can be effectively consumer-controlled.