What is difference between VFD and Vvvf?

What is difference between VFD and Vvvf?

Most commonly, the terms VFD and VSD are interchangeable. The term VVVF is often used in the mining industry – it refers to a variable voltage variable frequency drive. It describes exactly the same AC drive as the term VFD – any AC drive will automatically control voltage to suit the frequency it is running at.

What is VFD and why it is used?

VFD stands for Variable Frequency Drive. They are used for controlling the speed of an AC motor. They are also used for ramping up a motor for a smooth startup, or to prevent a heavy load from straining the motor on startup.

Why do we need VFD?

So, energy savings, intelligent motor control and reduction of peak-current drawn are three great reasons to choose a VFD as the controller in every motor-driven system. The most common uses of a VFD are for control of fans, pumps and compressors, and these applications account for 75% of all drives operating globally.

What’s the purpose of a variable voltage and frequency drive?

A VFD (Variable Frequency Drive), or rather a VVFD (Variable Voltage and Frequency Drive) is a precision electronic device specifically designed and used to control the speed of AC induction motors (single as well as three phase) without affecting the electric consumption, torque, impedance, magnetic flux, etc.

How is speed control with constant voltage variable frequency achieved?

Thus the concept of speed control with constant voltage variable frequency cannot be adopted. But from (3), it is possible to achieve constant flux Ø by maintaining (V/f) constant. This allows us to change voltage and frequency simultaneously to have speed control while maintaining constant air gap flux.

How is variable frequency control of induction motor used?

Due to flexible control strategies, application is majorly involved in variable speed drives such as high speed and low speed hoist industrial drives etc. Variable voltage variable frequency control of three-phase induction motor in closed loop is the significant feature of the thesis work.

How does a variable frequency drive ( VSD ) work?

VSDs can operate via mechanical, hydraulic, or electrical means. A variable frequency drive (VFD) is used to control the speed of AC motors, and does so by varying the frequency of the supply voltage to the motor. AC motors are designed for a magnetic field (flux) of constant strength.