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AC commutator motor we called it universal motor as it can run on both voltages AC & DC.
In case of DC voltage U can change direction of motor by revrsing supply connection,But in case of AC voltage U can not change direction because AC voltage alternates its voltage and current so reversal of current can not be achive in armature and field.

[This message has been edited by khansami (edited 07-29-2004).]