What is Autotransformer Starter? And Basic Working Principle || Tech Engineer

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An autotransformer starter is a type of motor starter that uses an autotransformer to reduce the voltage applied to the motor during startup. This method is commonly used in applications where the motor requires a high starting current, such as those with high inertia or heavy load.

The autotransformer starter consists of an autotransformer, a contactor, and a timer. The autotransformer has a single winding with multiple taps, and the contactor is used to switch between these taps during the startup process. The timer is used to control the duration of the voltage reduction.

During startup, the contactor connects the motor to the autotransformer, which reduces the voltage applied to the motor by a certain percentage. This voltage reduction helps to limit the inrush current to the motor, which can be several times the full load current. The timer controls the duration of this reduced voltage period, which is typically a few seconds. After this period, the contactor switches the motor to the full voltage, which provides the required torque to start the motor.

Autotransformer starters have several advantages over other types of motor starters, including lower cost, reduced voltage drop, and reduced stress on the motor. They are commonly used in applications such as fans, pumps, and compressors, and are particularly useful for large motors with high starting currents.

In summary, an autotransformer starter is a type of motor starter that uses an autotransformer to reduce the voltage applied to the motor during startup. This method is effective in reducing inrush current and providing the required torque to start the motor, making it a popular choice for applications with high starting currents.


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