A soft starter has different characteristics to the other starting methods. It has thyristors in the main circuit, and the voltage is regulated with electronic circuits. The soft starter makes use of the fact that when the motor voltage is low during start, the starting current and starting torque also low. During the starting time the motor will accelerate slowly to increase the speed and achieve the specified speed with fixed time frame. Eliminating unnecessary jerks during the start the motor.
The drive consist to AC to DC and DC to AC. As the speed of the motor depends on the frequency this makes it possible to control the speed of the motor by changing the output frequency from the drive and this is a big advantage if there is a need for speed regulation during continuous run.
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