Inverter And Soft Start, You Didn't Choose The Wrong One!

  https://www.kaichuanpower.com/inverter/ 

   Soft starters and frequency converters are two completely different products. The inverter is used where speed regulation is required, and its output not only changes the voltage but also changes the frequency at the same time; A soft starter is actually a voltage regulator that is used when the motor is started, and the output only changes the voltage and does not change the frequency. The inverter has all the features of a soft starter, but it is much more expensive and structurally complex than a soft starter.

1. The main difference between the two

(1)Soft start is to try to cut and destroy the sine waveform, which is very easy, as simple as water flowing low;

(2)The inverter is trying every possible way to obtain a sine waveform with adjustable frequency, which is difficult! It's as hard as water to go high.

2.Characteristics of inverter

(1)about the inverter, is a kind of equipment that changes the frequency of three-phase sinusoidal alternating current,

(2)because to change the direct current into a sinusoidal AC waveform, it is an irreversible process, or it is impossible, can only use the average voltage waveform is the sine wave of the PWM to broaden the carrier to achieve the purpose of the sine waveform of frequency conversion,

(3) the average voltage waveform is the sine wave of the PWM brightening carrier, through the full control device

(4) The asynchronous motor filters out the sinusoidal waveform from the PWM widening carrier and generates a constant rotating magnetic field required by the motor;

(5)By changing the frequency, the synchronous speed of the asynchronous motor is changed to achieve the purpose of frequency conversion speed regulation of the AC motor

3. Differences in technical indicators:

(1) The thyristor AC voltage regulating circuit is a circuit that obtains an alternating current with adjustable average voltage by adjusting the conduction angle of the thyristor and cutting the waveform of sinusoidal alternating current;

(2) This kind of AC voltage regulation circuit is used in automatic heating temperature control circuits, stage dimming circuits and other load circuits that have nothing to do with AC waveforms but are only related to the average voltage;

(3)However, some people and even the so-called experts use this thyristor AC voltage regulating circuit for the start of asynchronous AC motors, and the name is Japanese soft start;

(4) Because the asynchronous AC motor works under the three-symmetrical sinusoidal AC waveform, there is a constant rotating magnetic field

(5) If the alternating current of the sinusoidal alternating current waveform is cut by adjusting the conduction angle of the thyristor and used for the asynchronous AC motor, a constant rotating magnetic field cannot be generated;

(6) This AC waveform is used in the asynchronous motor to completely destroy the starting performance of the asynchronous motor, the starting torque is low, the starting current is large, and there is no soft start function as everyone imagines;

(7) All soft-start motors are started when they are close to full voltage, with long starting time and large starting current, which has a greater impact on the power grid;

(8) The self-coupling step-down start, star-delta start, water resistance step-down start, etc. of the asynchronous motor do not change the sine waveform, which are all good and effective starting equipment, which are better than soft start.