Hi

What's the different between frequency inverter and soft starter for electronic motor control?

Inverter control the electric motor by adjusting the power frequency, such as industrial inverter pump. Soft start basically is changing the resistor in circuit series, so that the current from small to larger, in such a way to start the big power motor, to reduce high-power motor started directly to the power grid caused fluctuations, or cause some unimportant load shedding trouble.

Frequency inverter can change the power frequency, soft starter is just a start button, play a role in the device start period, they are not comparable at all.

The soft starter integrated motor soft start and soft stop and energy saving in light load, and a variety of protection features all-in-one of new motor control device. Its main components are connected in series with the power and charged with motor between three opposite parallel thyristor and its electronic control circuit. Use of different methods to control the three opposite parallel thyristor conduction angle, so that charged with the input voltage of the motor varies according to different requirements, different functions can be achieved.

Soft starter and frequency inverter are two products with entirely different purposes. The frequency inverter is used to control speed, and it can change the voltage and frequency at the same time; In fact, soft starter is is a regulator for the motor starter, it changes the output voltage only, does not change the frequency. Inverter integrated soft starter features, but its price is much more expensive than the soft starter, and the structure is much more complicated.

For soft start there are two approaches, one is using special soft starter; the other one is using frequency inverter. The old methods of traditional for soft starting has rarely in use.
Frequency inverter can also be said to be a soft starter, but be used widely to different motor speed control applications.