soft starter
soft starter A soft starter is a solid-state device that protects AC electric motors from damage caused by sudden influxes of power by limiting the large initial inrush of current associated with motor startup. They provide a gentle ramp up to full speed and are used only at startup (and stop, if equipped) A motor soft starter reduces the mechanical stress on the motor and shaft, as well as the electrodynamic stresses on the attached power cables and electrical distribution network. Electrical soft starters can be any control system that reduces the torque by temporarily reducing the voltage or current input, or a device that temporarily alters how the motor is connected in the electric circuit. Soft starters can reduce the torque by temporarily reducing the voltage or current input is controlled by reverse-parallel connected silicon-controlled rectifiers (thyristors). A soft starter consists of a number of ant...
