What are the advantages and disadvantages of the soft starter and the ordinary string resistor start-up ratio? - 推酷

Photocoupler

1. The string resistance start is of course the earliest, and it is rarely used because of the large energy consumption;

2, string resistance start has its advantages, the reactive current is small, so the starting current is reduced;

3, string resistance start has its advantages, does not change the sinusoidal AC waveform, the motor starting torque is powerful;

4. "Soft start" is not a soft start in the true sense:

1) Because all the traditional step-down startup modes do not change the power supply waveform, its startup current is larger than all conventional startup methods;

2) "Soft start" destroys the sinusoidal waveform of the power supply, the harmonics are large, and the starting torque is small and weak;

5. The requirements for the starter equipment of the asynchronous motor are:

1) The starting current should be reduced by a large amount, that is, the starting current is small;

2) To start the torque is large, can be dragged, the starting time should be small;

3) Rather than some people say that "the torque is small and no impact", don't worry that the machine is made of tofu. The asynchronous motor starting device is not to reduce the impact, and reducing the impact is a flickering word;

6. Many people don't know why asynchronous motors need to start equipment?

7, the asynchronous motor to start the device is to reduce the large current when it starts;

8, the purpose of the asynchronous motor to start the equipment is to have enough starting torque to turn the load;

9, not to reduce the impact, there is no tofu! ! !

“The string resistance start-up is of course the earliest, and it is rarely used because of the high energy consumption;”

1, the energy consumption is rarely used, it is already very early;

2, now using IGBT transient technology, you can eliminate the energy loss of the resistor!

3, just the circuit to be redesigned, can be the best start circuit and start device!