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1.—Continued air-gap density ampere turns necessary armature core armature inductors Assume auxiliary field BRASS BRUSH HOLDER BRUSH YOKE calculations cent circular mils commutator bars conductor copper Copper loss core losses current density diameter of armature DIRECT CURRENT Direct-current Dynamo Dynamo Design eddy current loss Electric Machinery empirical formula energy loss Esterline feet per minute force per square frequency full load High-speed belted hysteresis increase insulation leakage coefficient length of armature lines of force magnetic circuit magnetic density multipolar no-load ampere turns number of ampere number of poles number of slots number of turns obtained output peripheral speed polar arc pole core pole shoes practice ratio Revolutions per Minute segments per pole self-induction series field coil SHAFT short-circuited coils shunt field coil shunt field current sq.in square inch Steinmetz teeth temperature rise total number total radiating surface turns per coil Turns per Inch turns per pole volts wire
Page iii - OF ELECTRICAL MACHINERY A MANUAL FOR THE USE, PRIMARILY, OF STUDENTS IN ELECTRICAL ENGINEERING COURSES
Page 25 - An increase of the temperature of the armature causes an increased radiation of heat per degree rise in temperature, but
Page 7 - mean, and will be greater for machines of greater specific output, therefore larger in the case of large modern machines than for small or old types.
Page 29 - case, in which a brush is never in contact simultaneously with more than two segments
Page 29 - wires which may be undergoing commutation at the same time under another brush, we
Page 24 - of the material. For the numerical value of this constant Steinmetz gives the
Page 14 - two paths in parallel through the armature regardless of the number of poles.
Page 29 - flows from the external circuit to the brush and there divides into two