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Definition of "commutator film" |
an oxide layer on the commutator surface, indicated by a dark color or a “film,” that is required for proper commutator action and full loading of the machine. On a new DC machine commutator, or on a commutator that has just been stoned, there is no “film” on the commutator. It is advisable to refer to the manufacturer’s technical manual for the proper procedure to “break in” the commutator and develop the film so the machine can be operated at rated conditions. |
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