As a result of increase of world prices for energy resources and, first of all, for crude oil, and also of problem of emission of greenhouse gases (first of all CO₂) in the atmosphere arisen from combustion of organic fuel, the issue of energy resources saving is very acute.

One of the most effective ways of electrical energy saving is using variable frequency drives, especially for turbo machines, which centrifugal and axial pumps, fans and compressors belong to.

According to turbo machine affinity laws, the following relations are valid:

Where – Q₀ и Q₁ - capacities (flows), Н₀ и Н₁ – heads (pressures), Р₀ и Р₁- useful powers outputted by a mechanism at rated – n₀ and new n₁ rotational speed.

Power consumed from mains under variable frequency control is calculated according to formula:

Thus, at capacity reduction of mechanism in 2 times, energy consumption under variable frequency control is reduced nearly in 8 times!

Besides energy saving by 25 – 60%, on introduction of variable frequency drives the following results are achieved:

• Saving of motor maintenance costs
• Avoiding of breakages and damages of mechanisms and other equipment caused by impact mechanical and electric current loads
• Proving of optimal behavior of technological processes and high quality of finished products
• Automation and possibility of computer control and visualization of production processes

EOS Ltd. performs a calculation of estimated energy saving, on the base of the data about operating profile of a mechanism, given by consumers.