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pumps and frequency inverter
Publish:China EM Technology Limited  Time:2017-07-04
All of us know that frequency inverters are widely used in many applications for energy saving. They are tools that is used to change the frequency of electricity.
Below is application of frequency converter used for pumps.
Usually pumps are sized to cope with the maximum predicted flow, leading to the motors running at part load. The result is low motor efficiency and a low power factor which pulls in extra reactive current.
Today, the speed of centrifugal pumps in industrial applications is almost exclusively controlled by frequency inverter (FI) that is integrated into the plant‘s control system. Frequency inverters allow greater pump control. Previously pumps can only be on or off, with the result that motors were running with low loads. With frequency inverters, they can adjust motor speeds individually and achieve a high load factor with higher motor efficiencies.
This means big energy savings, as a reduction in motor speed of as little as 10% can save 27% of electrical energy. Early indications indicate that a saving of 17% from reducing speed has been achieved and total saving with power factor is over 50%. What‘s more, with experience, even better results are expected.
A well-known example, pumps represent about 31% of the energy used by motor drives equipment in the UK, the largest single use. With modern frequency inverter of pumps, we can expect the big energy savings in UK.
And in other countries, frequency inverters works well for energy saving.