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DESIGN OF D C MACHINES PART
Methods and Process of Design 1114
Slots Bars Coil Pitch Etc 2949
12 other sections not shown
25 inch air gap ampere-turns drop ampere-turns per inch ampere-turns per pole amperes approximately armature core armature current armature diameter assumed band brush-contact calculated cent circuits coil side commutating pole commutating-pole coil commutator bars core length cotton tape cross-sectional area desired determined dimension Example Continued).—A 3-hp field coils flux density frame full-load heat horsepower hysteresis inches per watt increase insulation kilowatts large number layer leakage flux length of turn lines per square load machine main poles maximum mica mutator no-load number of bars number of commutator number of conductors number of main number of slots number of turns obtained open-type motor ordinarily peripheral speed pole body resistance result revolutions per minute rheostat saturation curve series coils series-coil shaft shunt coil shunt-field space square inches surface temperature rise thickness tooth total number turns per bar turns per inch two-circuit winding voltage drop voltage induced volts width wire zone