What is a brushless loopless starter?
The brushless and loopless starter is a starting device that overcomes the shortcomings of the wound-type asynchronous motor equipped with a slip ring, a carbon brush and a complicated starting device, and retains the advantages of a small starting current of the winding motor and a large starting torque. . JR, JZR, YR, YZR three-phase wound rotor AC asynchronous motor originally started with resistance starter, reactor, frequency sensitive varistor, liquid variable resistance starter and soft starter (except for shifting and camera mounting) You can use the "brushless and loopless starter" to update.
8, there are several ways to start the capacitor of the motor?
There are two kinds of starters:
1. Capacitor start (refers to the capacitor is disconnected after the motor starts);
2, the capacitor starts and runs (the capacitor participates in the operation after the start).
9. Can the transformer be used as the load of the inverter?
In principle, it should be ok, but it is not practical in practice. The inverter is not boosted by transformers. It should also be used for varieties of circuits above 380V. If higher voltage is required, it can also be directly used with 220V or 380V direct frequency conversion and then use the double voltage method to obtain high voltage circuit can be used. The frequency converter is mainly used for load driving (such as electric motor), and it is rarely used for power frequency conversion. The function of the frequency converter is far from the frequency conversion itself, and there are many additional functions, such as various types of protection. To obtain a variable frequency power supply, it is not economical to consider it. It is recommended to use other frequency conversion circuits.
10. Can the inverter be adjusted to 1Hz? How many HZ can I use?
If the inverter is used on a general AC asynchronous motor, the inverter is close to DC when it is adjusted to 1Hz. It is absolutely impossible. The motor will work under the maximum current within the inverter limit. The motor will generate heat seriously. Burn the motor.
If the operation exceeds 50Hz, it will increase the iron loss of the motor, which is also unfavorable to the motor. Generally, it is better not to exceed 60Hz (the short time is allowed), otherwise it will affect the service life of the motor.
11. What is the working principle of the frequency adjustment resistor of the inverter? Why can the adjustment resistor change the frequency?
The frequency adjustment resistor of the inverter is used to proportionally divide the 10V reference voltage of the inverter and then send it back to the main control board of the inverter. The main control board of the inverter then converts the voltage sent back by the resistor to the analog-to-digital conversion to read the data, and then converts it into the proportional value of the rated frequency to output the current frequency. Therefore, adjusting the resistance value can adjust the frequency of the inverter.
12. Can the inverter decouple the motor current?
Can the frequency conversion be decoupled? No! But as long as the output frequency f and the synchronous speed n1 keep the slip rate in the stable zone or the rated slip rate Se, it is equivalent to decoupling the motor current because the rotor power factor is now 1 The rotor current is the torque current to be decoupled. The inverter is the speed control device of the asynchronous motor. It is impossible to carry out any so-called control beyond the mechanical characteristics of the asynchronous motor!
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