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A rotating electric machine with two armatures, used to convert alternating current to direct current.

[Greek dunamis, power; see dynamic + motor.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Electrical Engineering) an electrical machine having a single magnetic field and two independent armature windings of which one acts as a motor and the other a generator: used to convert direct current from a battery into alternating current
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈdaɪ nəˌmoʊ tər)

an electric machine for transforming direct current into alternating current or for altering the voltage of direct current.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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Hoping to mirror the efficiency increases for the home that industry has gained by switching to variable-speed motors, the Department of Energy awarded Cleveland-based DynaMotors Inc.
But DynaMotors' technology--which inserts a switch in each motor coil that can be turned on and off as needed--promises to cut that difference in half.
DynaMotors said that its design, operating at half speed for twice as long, moves the same amount of air as a single-speed motor but uses one-quarter of the energy.