Star-delta many levels starter for an AC induction motor

摘要

A star-delta multi-level starter is provided for controlling a starting and a slow stopping of an AC induction motor with desired quality, nevertheless changing conditions of a power supplying and a motor charge. An improving of a quality of the starting or the stopping is achieved as a result of an increasing number of power levels from two achieved in usual star-delta starter and producing effective changing of the power levels. The increasing number of the power levels is achieved by using electrical elements, such as resistors, transformers and others. The changing of the power levels is fulfilled at moments defined automatically. The changing, of the power levels may be fulfilled in any predetermined order, for example, in step-by-step increasing or decreasing order. The control system of the star-delta multi-level starter permits to use one parameter for changing desired quality of the starting, as in usual star-delta starters.