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air-gap Allowing amount ampere turns approximately armature core Assume auxiliary average bearing belted Bolts Brass brush BRUSH HOLDER calculations carry cent coefficient commutator commutator bars constant copper cover current density density depth DESIGN desired diameter Direct-current direction DYNAMOS Electric Machinery energy equal feet field current flux formula frame full load give given heat increase inductors insulation iron Kilowatt Capacity length less limits lines of force load loss machines magnetic magnetic density Mean mils Minute multipolar necessary number of poles number of slots obtained output path pitch pole core possible practice Press proportion radiating surface ratio reasonable reduce ring segments series field SHAFT short-circuited coils shunt field shunt field coil slot space specific speed square inch Steel STUD TABLE teeth temperature rise usually varies voltage volts volume watts width winding wire yoke
Page 23 - the ratio of increase diminishes as the temperature increases, and an increase of the amount of heat generated in the armature increases the temperature of the armature, but less
Page 5 - 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 27 - case, in which a brush is never in contact simultaneously with more than two segments
Page 27 - wires which may be undergoing commutation at the same time under another brush, we
Page 22 - of the material. For the numerical value of this constant Steinmetz gives the
Page 12 - two paths in parallel through the armature regardless of the number of poles.
Page 27 - flows from the external circuit to the brush and there divides into two