THE THOUGHT IS IN THE QUESTION THE INFORMATION IS IN THE ANSWER
HAWKINS ELECTRICAL GUIDE NUMBER TWO QUESTIONS ANSWERS & ILLUSTRATIONS A PROGRESSIVE COURSE OF STUDY FOR ENGINEERS, ELECTRICIANS, STUDENTS AND THOSE DESIRING TO ACQUIRE A WORKING KNOWLEDGE OF ELECTRICITY AND ITS APPLICATIONS A PRACTICAL TREATISE by HAWKINS AND STAFF
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THEO. AUDEL & CO. 72 FIFTH AVE. NEW YORK.
COPYRIGHTED, 1914, BY THEO. AUDEL & CO., NEW YORK.
Definition—how continuous current is obtained—type ofarmature—comparison ring and drum armatures—why drum armature is theprevailing type—disc armatures—why disc armatures were abandoned.
Preliminary considerations—winding diagrams and winding tables—lap andwave winding—angular pitch or spread of drum coils—parallel or lapwinding—series or wave winding—double-windings—Siemenswinding—objection to Siemens winding—chord winding—multiplexwindings—number of brushes required—number of armaturecircuits—equalizer rings—drum winding requirements.
Current distribution in ring and drum armatures—connection ofbrushes—variation of voltage around the commutator—crossmagnetization; field distortion—remedies for fielddistortion—angle of lead—demagnetizing effect of armaturereaction—effect of lead—eddy currents; lamination—remedy foreddy currents—magnetic drag on the armature—smooth and slottedarmatures—comparison of smooth and slotted armatures—magnetichysteresis in armature cores—core loss or iron loss—deadturns—friction.4
Period of commutation—commutating plane—normal neutralplane—neutral plane—plane of maximuminduction—commutation—position of thebrushes—sparking—effect of self-induction—construction ofcommutators—points relating to commutators—types ofcommutator.
