Common motor starting methods, a total of 5 kinds
Common motor starting methods are as follows:
1. Full pressure direct start;
2. Auto-decompression starting;
3. Y-Δ starting;
4. Soft starter;
5. The inverter starts.
At present, soft starters and inverters are starting to develop in the market. Of course, it is not necessary to use a soft starter and a frequency converter to start up. The cost and applicability are the main references. The following describes the characteristics of various startup methods.
Among the above several starting control methods, the star-delta starting, self-depressing and decompression starting due to its low cost, maintenance of relatively soft start and variable frequency control is easy, currently in the actual application also occupies a large proportion. However, because of the assembly of discrete electrical components, there are many control line contacts, and the fault rate is relatively high in its operation. The technicians who have been engaged in electrical maintenance know that many faults are caused by poor contact between the contacts of the electrical components and the wiring contacts. In the case of harsh working conditions (such as dust and moisture), such faults are more, but inspection It really takes a lot of time. In addition, according to the production needs, it is necessary to change the operation mode of the motor. For example, if the original motor is running continuously, it needs to be changed to the timing operation. In this case, it is necessary to add components and change the circuit. Sometimes, due to load or motor changes, it is necessary to change the starting mode of the motor. If the original is self-starting, it should be changed to the star-delta starting, and the control circuit should be changed.
