How to create spinning rim effect on keyshot?

How to rendering spinning rim effect on keyshot like this picture https://d2t1xqejof9utc.cloudfront.net/screenshots/pics/93900/original.jpg?1333599480 ?
How to rendering spinning rim effect on keyshot like this picture https://d2t1xqejof9utc.cloudfront.net/screenshots/pics/93900/original.jpg?1333599480 ?
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