A 3-phase autotransformer is typically employed where star or delta starting provides insufficient starting torque. Each phase of an autotransformer consists of a single winding on a laminated core. This incoming supply is connected across the ends of the coils, and one or more tapping points (or a sliding contact) provide a reduced voltage output as illustrated in the figure below:
Figure 1.0 Autotransformer starter for cage induction motor
John Mulindi is an Industrial Instrumentation & Control Professional with a wide range of experience in electrical and electronics, process measurement, control systems and automation. He writes on technical as well as business related topics. In free time he spends time reading, taking adventure walks and watching football.
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