Inside our rewinding shop: a burnt motor’s week
Strip, record, wind, varnish, bake and test: what happens to a 37 kW motor from the day it arrives.
Why your pump needs a drive
Throttling a valve wastes power. Slowing the motor does not.
Many pumps and fans in Indian plants run at full speed all day, with a valve or damper partly closed to control the flow. It works, but it is like driving with the brake on.
The power a pump or fan needs falls sharply with speed. Running a centrifugal pump at 80% speed needs only about half the power of full speed. A variable frequency drive slows the motor to match the demand, instead of burning the extra energy across a valve.
The savings are largest where the demand varies: water supply that peaks in the morning, cooling towers that work harder in May than in December, and air handling in buildings. Savings of 20–40% are common on such loads.
A drive also brings softer starts, which means less stress on pipes, belts and couplings, and lower starting current. It needs the right panel, cooling and filtering, and the motor must be suitable for drive duty. We survey the system, size the drive and commission it, and log the power before and after so you can see the saving for yourself.
