Is the extruder in 110KW a good ac motor or dc motor?
Now we use frequency conversion to ac motor. Very few dc machines, because dc machines need to be maintained too often.
I think you're asking about the screw extruder, which is used in the indirect spinning. But it's pretty much the same. The design of the front (10 years ago) most use dc motor, because the main advantage of dc motors is speed control performance is good, is out of this, almost no a comparable to dc motor of ac motor after development. The principle, structure, cost and maintenance management of ac motors are superior to dc motors, and they do not need to be replaced regularly with dc motors. After the advent of frequency conversion motors, the final advantage of dc motors, the range of speed adjustment, disappeared. Sad!!! So now dc motors are going to be very hard to develop. The new equipment now has almost no direct current. I hope I can help you.
Usually dc motors, the mechanical properties of low speed are better than ac motors
