A frequency converter is a device that can change the frequency of an electrical power supply. It can be used to match the frequency of a generator to that of the power grid, or to convert the frequency of power from one region to another. They can also be used in industrial applications to change the speed of motors, for example, in a production line. There are several types of frequency converters, including static and rotary. Static converters use electronic devices to change the frequency, while rotary converters use a mechanical device, such as a rotating machine, to change the frequency.