rotary phase converter
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rotary phase converter[′rōd·ə·rē ′fāz kən‚vərd·ər]
Machine which converts power from an alternating-current system of one or more phases to an alternating-current system of a different number of phases, but of the same frequency.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.