autotransformerstart
Autotransformer starting, or autotransformer start, is a method of starting induction motors that uses an autotransformer to apply a reduced voltage to the motor during the start-up phase. The reduced voltage lowers not only the starting current drawn from the supply but also the mechanical stress during acceleration. After the motor reaches a predetermined speed, the transformer is bypassed and full line voltage is applied.
Operating principle: The motor is connected to a tapping on an autotransformer that provides a fraction a
Advantages: The method reduces inrush current and voltage drop on the supply, yielding smoother acceleration and
Applications: Autotransformer starting has been used for induction motors in fans, pumps, conveyors, compressors, and other