There have been cases reported where bearings have been damaged by AC drives due to bearing currents. Some of these cases are true, but most are tales that have emerged because no one bothered to investigate the…
High-frequency common-mode core filters reduce electromagnetic interference and eliminate bearing damage by electrical discharge. High-frequency common-mode (HF-CM) cores are special nanocrystalline magnetic cores which have superior filtering performance compared to regular ferrite cores. They act like a common-mode inductor (between phases and ground).
Drive systems often operate in potentially explosive atmospheres. One example is the inflow area of a sewage treatment plant. If frequency converters are used for speed control of drives in such areas, the facility must fulfil special conditions. The basis for this is provided…
The Ecodesign Directive is the legislative framework that sets requirements on all energy related products in the domestic, commercial and industrial sectors throughout Europe. The full title is the Ecodesign Directive for Energy Related Products (ErP) 2009/125/EC.…
Various types of AC mains systems are used to supply power to electrical drives. They all affect the EMC characteristics of the system to various degrees. The five-wire TN-S system is the best in this regard, while the isolated IT system is the…
