## Design of Electrical Machinery: A Manual for the Use, Primarily, of Students in Electrical Engineering Courses, Volume 2 |

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### Common terms and phrases

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

### Popular passages

Page iii - OF ELECTRICAL MACHINERY A MANUAL FOR THE USE, PRIMARILY, OF STUDENTS IN ELECTRICAL ENGINEERING COURSES

Page 25 - 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 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

Page 30 - There is, therefore, no sparking, since the current in the trailing tip decreases