1. Is the soft starter a frequency converter?
The soft starter is a novel motor control that integrates soft parking, light load energy saving and multiple protection functions. The device is called Soft Starter abroad. Its main components are three-phase parallel thyristor and its electronic control circuit connected in series between the power supply and the controlled motor. Different functions can be achieved by using different methods to control the conduction angle of the three-phase parallel thyristor so that the input voltage of the controlled motor changes according to different requirements.
Soft starters and frequency converters are two products with completely different uses. The frequency converter is used where speed regulation is required. Its output not only changes the voltage but also the frequency. The soft starter is actually a voltage regulator. When used to start the motor, the output only changes the voltage but not the frequency. The frequency converter has all the functions of a soft starter, but its price is much more expensive than a soft starter and its structure is much more complex.
2. What is the difference between soft starter and frequency converter
We have learned from the previous article that soft starters are not inverters, so what is the difference between soft starters and inverters?
1. In terms of frequency, the output frequency of the soft starter is fixed to the power frequency, and the frequency is not adjustable; the output frequency of the inverter is adjustable.
2. In terms of voltage, the soft starter controls the output voltage by controlling the conduction angle of the thyristor (or other power electronic components), and its output voltage slowly rises from 0V to the rated voltage; the frequency converter The voltage is adjustable.
3. In terms of motor speed, the soft starter cannot adjust the motor speed; the frequency converter can adjust the motor to run at any speed.
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