The Ball Mill Drive Motor Choices To The Ball Mill Machine

By Author: crusher
Total Articles: 5
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There have been quite a number of mill drives over the years. In North America, the most common drive in the past has been the low speed synchronous motor driving through an open pinion and bull gear.

When utility softness was a concern, the super-synchronous motor was used. In other parts of the world, the wound rotor motor was preferred. In the late 1950s, when mills approached 2500 HP, the center drive mill arrangement with the enclosed geared drive using a high-speed synchronous motor became quite popular. In more recent times the wound rotor motor with the liquid rheostat has come into use in North America when a soft-start was required to overcome torque restrictions or voltage drop problems.

Appearing in the 60's were the center gear drives with twin synchronous motors. Problems with torque oscillation and high cost lead to limited use of this drive configuration. In an attempt for a better drive solution, it was reasoned in the early 70's that less was better, and the gearless drive was born. This can be accomplished using the wrap-around principle or the external principle, where the motor rotor is ...
... directly connected to the mill torque tube. Since the speed of these motors is extremely slow (15 RPM), the cost is high, the size tends to be rather large, and the problems with harmonics have been significant.

The ball mill drive motor choices to the ball mill machine,