Voltage of variable frequency inverter

Most inverters are of the variable voltage, variable frequency design. They consist of a converter section, a bus capacitor section and an inverting section. The converter section uses semiconductor devices to rectify (convert) the incoming fixed voltage, fixed frequency 3-phase AC power to DC voltage which is stored in the bus capacitor bank.

Variable Voltage Variable Frequency (VVVF) inverters, also known as variable speed drives or adjustable frequency drives, are powerful tools in the field of industrial automation. These advanced electronic devices enable precise control over motor speed by varying both the voltage and frequency supplied to an electric motor.

Frequency inverter relies on the internal IGBT to adjust the voltage and frequency of the output power supply, according to the actual needs of the motor to provide the required power supply voltage, and then achieve the purpose of energy saving and speed regulation.

Due to the extensive use the 180° of the 180° case, a variable voltage inverter is also called a square wave inverter. At very low speeds there are commutation problems, as the input voltage may not be sufficient for commutating the thyristors. This imposes a lower limit on the frequency. A multimotor drive is possible using this type of inverter.

A variable frequency drive is defined as a type of AC motor drive that controls the speed and torque of an electric motor by varying the frequency and voltage of its power supply. The frequency of the power supply determines the rotational speed of the motor, while the voltage determines the torque.

By converting the incoming 60 Hz AC power to a DC voltage, inverter drives (also called variable frequency drives) allow AC motors to run at variable speeds, and reduce the inrush of current when the motor starts to rotate.