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When the equipment is used to perform some functions, there is often the need to change RPMs of their electromotors. In order to change RPM of DC motors, it is sufficient to change the voltage supplied accordingly. Unfortunately, the most of motors used in industry is 3-phase ones supplied with AC voltage. For long time RPMsd in such drives were changed by mechanical means; this was the belt-type variators at the beginning and the more advanced friction-type variators later. Nevertheless, today such mechanical variators are not always practical in use, especially because of the need to change RPM automatically, depending on the load etc. There are more and more frequency converters in use, enabling both to change RPMs of the motors and to program their operation; depending on signals from sensors, to implement “soft start”(without knock) and “soft stop”.
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