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Mill Design

MVC-013F

Literature Review: Gearless Motor Failures – A Mill Designer’s Viewpoint

This post presents a review of a paper by a mill designer on the state-of-the-art of ring motor design in gearless drives. The conclusions in the paper are not justifiable. Ring motors are much more complex than grinding mills and the simple remedies offered in the paper would not have avoided most of the past failures. It is shown that external influences and design culture were the root causes of most of the ring motor problems since 1996 and the problems in design culture also exist in some mill vendor design groups. The conclusion in the reviewed paper that the ring motor failures are not diameter related is incorrect.

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Shell vs Trunnion-Mounted Mills

Shell and trunnion-mounted mills are reviewed. A literature review is presented. Mill vendors’ papers are contradictory and in some cases, it is apparent that the papers or articles highlight the advantages of a particular mill design just because the author works for a company that makes a certain type of mill. Shell-mounted mills are not inherently better or worse than trunnion-mounted mills. It is all matter of proper design choices.

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