010 с c. с о с в A О А + В O AB+BC'+CA+B'C' о вес ОА В С 1 11 12 13 MUX So S1 gure will be F

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Adjustable Frequency Drives

Adjustable frequency drives are solid-state devices popularly known as variable frequency drives. In some cases, they are also known as variable speed drives, microdrives, inverter drives, or motor speed controllers. The variable frequency drives are the motor drives specially used in the electromechanical system for controlling motor speeds. These variable frequency drives control the motor speed by regulating the input frequency and voltage of the alternating current (AC). An inductor can also be used in place of variable frequency drive to control the motor speeds, but it leads to huge losses in the form of heat energy. Hence, the variable frequency drives account for safe and efficient control of motor speeds. Besides speed control, a variable frequency drive can also be used to control the sudden torque experienced by a motor during its start-up and stopping, it also reduces torque fluctuations. Thus, a motor can run at constant torque at the required speeds.