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Motor Soft Starter
From Wikipedia, the free encyclopedia
Motor Soft Starter
A motor soft starter (when in the context of AC electric motors) is an electronic device that reduces the torque in the power train of a motor. In practice this is mechanically a clutch, fluid drive, magnetic coupling or shot coupling. Electrically a motor soft starter can be any control system that reduces the torque by reducing the voltage in, or a device that causes a change in the motor connection.
The soft starter can utilize solid state devices to control the current flow and therefore the voltage applied to the motor. In theory, soft starters can be connected in series with the line voltage applied to the motor, or can be connected inside the delta loop of a delta connected motor, controlling the voltage applied to each winding.