International Library of Technology · Scranton, International Textbook Co. · leaf 427
ion ofcurrent. 90. Test for Field Connections.—If there is any doubtas to whether a set of field coils is connected properly ornot, the matter can be decided by a very simple test with apiece of soft-iron rod about 3 or 4 inches long. It is wellknown that if a piece of iron is placed near a magnet… … Fig. 67. polarity test is inexperienced, it is a safe plan to take the arma-ture out of the motor, because when a current is sent throughthe field coils and the pole pieces become magnetized, theyinduce poles of the opposite polarity in the armature coreopposite them, so that unless great care is…
Electrical engineering
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