Behind the MVSD vs. VFD debate

摘要

THE mechanical variable-speed drives (MVSD), particularly the hydrodynamic torque converters, could dampen pulsations generated by the connected machines (such as the synchronous motor produced pulsation torques). It is particularly true for large dynamic torques in transient situations such as start-up or the short-circuit transient excitations. This mechanical "soft" start and the dampening effects could provide a positive impact on a rotating machine train.