What Is The Energy Saving Effect Of The Soft Starter?

- Jul 27, 2017 -

The soft starter is a starting device connected between the motor and the power supply. Its working principle is to use a three-phase anti-parallel thyristor as a voltage regulator. Then the soft starter can play the effect of energy saving.


Here we in-depth analysis, the soft starters in the end can not save it?


First of all, we understand the working principle of the soft starter, the soft starter to start the motor, the thyristor output voltage gradually increased, the motor gradually pressurized start until the thyristor conduction, to achieve full smooth motor start. The soft starter function is to reduce the starting current, to avoid over-current trip and the impact of the power grid.


After the start-up process, the soft starter is automatically replaced by a bypass contactor to reduce the heat loss of the thyristor and extend the life of the soft starter. The soft starter also provides soft stop function, soft stop and soft start the process of reverse, the voltage gradually reduced, the number of revolutions gradually reduced to zero, to avoid free stop caused by the impact of torque, reduce equipment wear and tear.

From this we can also find that, in fact, the soft starter start and stop is in a very short period of time, then go to bypass operation, so short time the energy efficiency is basically negligible.Therefore, the soft starter Energy-saving effect is minimal, can not count.


Through the understanding of the working principle of the soft starter we can find the main role of the soft starter is the motor start and stop, and the motor start and stop no more than 60 seconds, how much can the festival it. So the soft starter energy-saving effect is minimal.


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