What are frequency converters?
A frequency changer or frequency converter is an electronic or electromechanical device that converts alternating current of one frequency to alternating current of another frequency.
Static and rotary frequency converters
a. Frequency changers are used for converting bulk AC power from one frequency to another, when two adjacent power grids operate at different utility frequency.
b. A variable frequency drive is a type of frequency changer used for speed control of AC motors such as used for pumps and fans. The speed of an AC motor is dependent on the frequency of the AC power supply, so changing frequency allows the motor speed to be changed.
c. Another application is in the aerospace and airline industries. Often airplanes use 400Hz power so a 50Hz or 60Hz to 400Hz frequency converter is needed for use in the ground power unit. Airlines might also utilize the converters to provide in-air wall current to passengers for use with laptops and the like.
d. In renewable energy systems, frequency converters are an essential component of doubly fed induction generators as used in modern multi-megawatt class wind turbines.
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