Variable speed drives (VSDs) can significantly reduce pumping system energy consumption through more efficient motor control. VSDs allow pumping system motors to vary their speed based on system demands, lowering energy usage compared to fixed speed motors. There are mechanical and electrical methods for varying motor speed, with electrical VSDs being the most common. VSDs provide advantages like reduced power requirements, increased efficiency, lower wear on pumps, and longer equipment life. However, care must be taken to avoid potential vibration issues at certain speeds. Overall, implementing VSDs in pumping systems can help address energy costs and consumption worldwide.

1. Variable Speed Drive
In Pumping System
PRANAV ANIL TELI
BE MECH

2. Introduction
 Pumping systems account for nearly 20% of
the world’s energy used by electric motors
and 25% to 50% of the total electrical energy
usage in certain industrial facilities.
 Significant opportunities exist to reduce
pumping system energy consumption
through smart design, retrofitting, and
operating practices.
 The savings often go well beyond energy, and
may include improved performance,
improved reliability, and reduced life cycle
costs.

3. Saving of power

4. Types of VSD
1. Mechanical : Fixed speed motor
I. Mechanical variator
II. Fluid coupling
III. Magnetic coupling
IV. Eddy current coupling
2. Electrical:
I. DC motor:
A. Electrical commutation
B. Mechanical commutation
II. AC motor:
A. Asynchronous
B. Synchronous

7. Advantages of VSD
1. More efficient
2. Less power requirement, hence economical
3. Reduction in speed reduces hydraulic losses in the
impeller
4. Increases bearing life
5. Reduces vibration and noise
6. Reduces wear and tear of pump hence increases
pump life

8. Disadvantages of VSD
 Resonance conditions can cause excessive vibration
levels, which in turn are potentially harmful to
equipment and environment.
 Should never be used in systems requiring high static
heads compared to total head
 Not suitable for all type of load pattern

9. Conclusion
 Considering world energy crisis, use of VSD in
pumping system can give us beneficial and
economical results