The frequency inverter is an electronic device that enables the conversion of an electrical variable ‘current’. In this case, the frequency inverter transforms an AC with a certain frequency into a voltage with variable amplitude and frequency. In short, this results in a voltage conversion.
A frequency inverter changes output voltage frequency and magnitude to vary the speed, power, and torque of a connected induction motor to meet load conditions. This control does not restrict the performance of a three-phase motor, it just improves its efficiency. Such motors are often used in industrial environments and are especially common in the field.
A Soft Starter is a device that starts motors with reduced power supplied at start-up. Reducing power reduces potentially damaging electrical and mechanical shocks of the system.

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