VARIABLE FREQUENCY DRIVE for running motors efficiently and control speed

VFD motor connection

1. What is VFD? VFD (Variable Frequency drive) is a device that can control the speed of an AC drive or induction motor by reducing/increasing the input frequency and voltage of the motor. And can also provide protection to the motor. N= (120f/p) N= Synchronous speed F= Frequency P= Number of poles

2. Why VFD is also called inverter ? When DC is converted to AC by inverter and AC to DC is Converter. DC to AC = Inverter AC to DC = Converter VFD to complete its operation first converts AC to DC and then converts DC to 3 phase AC. Therefore it will not be wrong to call VFD as Inverter. If you want to drive a 3 phase motor with your home's single phase line, a VFD can do that too.

3. Advantage of VFD:

4. Disadvantage of VFD:

5. Multiple motors with one VFD: All motors will run at same RPM. Total cable length for motors should be less than 500 meters. Total load (KW) must be 20% less than VFD power rating.

6. Where are the AC induction motor used: AC motors are a great power source for a number of reasons such as in pumps, food and beverage machines, automated conveyer equipment, packaging operations, washing machines, electric knife sharpeners, office equipment, ovens, and water heaters etc.