an electric machine for transforming direct current into alternating current or for altering the voltage of direct current, having two armature windings on the same core and a common magnetic field.
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British Dictionary definitions for dynamotor
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 & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012