A variable frequency drive (VFD) controls electric motors by varying the frequency and voltage of their power supply, allowing for controlled acceleration, deceleration, and energy savings. By reducing the operating speed, a VFD can significantly decrease energy consumption; for example, a 25 horsepower motor can save ₹3,76,180 annually. VFDs are utilized in various applications such as dust collectors, water supply systems, and conveyor systems.

1. VFD-Variable Frequency Drive

2. What is a variable frequency drive?
• A variable frequency drive (VFD) is a type of motor controller
that drives an electric motor by varying the frequency and
voltage of its power supply. The VFD also has the capacity to
control ramp-up and ramp-down of the motor during start
or stop, respectively.

3. Advantages of VFD
• Controlled Starting Current
• Reduced Power Line Disturbances

4. Lower Power Demand on Start

5. Controlled Acceleration

6. Power conversion

7. • Adjustable Operating Speed
• Adjustable Torque Limit
• Controlled Stopping

8. Energy Savings
Example: A VFD controlling a pump motor that usually runs less than full speed can
substantially reduce energy consumption over a motor running at constant speed for
the same period. For a 25 horsepower motor running 23 hours per day (2 hours at
100% speed; 8 hours at 75%; 8 hours at 67%; and 5 hours at 50%) a variable-
frequency drives can reduce use by 45%. At ₹7.00 per kilowatt hour, this saves
53,740 units energy & ₹3,76,180 annually.
• Kirloskar 25 hp 3PH 1440 RPM Foot Mounted Motor
• ₹ 49,988

9. • Reverse Operation
• Elimination of Mechanical Drive Components

10. Basic Principal of VFD

11. VFD Applications

12. VFD Applications
• Dust Collector

13. Water Supply Systems

14. Heavy Load Conveyor Systems

16. Cooling system control

17. Air Blower Control

18. Price