By Horace Field Parshall

Show description

Read or Download Armature Windings of Electric Machines PDF

Best machinery books

Process Centrifugal Compressors: Basics, Function, Operation, Design, Application

This booklet offers a entire examine business compressors. Readers can discover a good deal of knowledge in line with lengthy business adventure, on a transparent and well-founded method of real-gas dealing with, and on suggestions to many sensible difficulties. "Process Centrifugal Compressors" offers engineering contractors and clients of commercial compressors with a greater perception into the "how" and "why" of other layout good points, therefore supplying a fantastic foundation for facing brands.

Valve and Actuator Technology

An entire, state of the art advisor to the layout, functions, and upkeep of valves and actuators. Todays creation methods contain new and unique fluids, severe pressures and temperatures, and more and more subtle electrical and digital technique regulate expertise. What new valves and actuators can be found to satisfy the demanding situations dealing with mechanical designers, process/control engineers, and upkeep group of workers?

Additional resources for Armature Windings of Electric Machines

Sample text

Method of connection, the insertion of this resistance But in the above externally to the brushes will not increase the heating of the machine. This resistance is also so located that it could be adjusted in experimental work, and the differ- ence in sparking noted by having a short-circuiting switch shunted around the resistance. Another advantage of this winding is that pointed out in the remarks on Fig. 6, that in cases where the shape of the frame necessitates somewhat unequal magnetic induction in the would otherwise circuits, this various coils, occur.

High if ohmic, would be limited only by the permissible loss resistance leads to the commutator, and high-resistance but in both of these brushes have been used with considerable success ; cases heat has to be developed in undesirable localities. method of connection, the insertion of this resistance But in the above externally to the brushes will not increase the heating of the machine. This resistance is also so located that it could be adjusted in experimental work, and the differ- ence in sparking noted by having a short-circuiting switch shunted around the resistance.

F. of "y" and "m" shall be made equal tp 1. Figure 20 represents a two-circuit, doubly re-entrant, double-wound ring armature. common " factor of " y 8=26, n=4, m=2. m common factor of y (12) and (2) is 2. Therefore the winding will be doubly re-entrant. the position shown, coils 24 and 12, in series, are short-circuited by the negative brush. The circuits through the armature are, Greatest At { I t 1 25-13-1-15-3-17 26-14-2-16-4-18 10-22-8-2 11-23-9-21-7-19-5 40 \ I ' H Fig. TWO CIRCUIT, 20 DOUBLE WINDING.

Download PDF sample

Rated 4.56 of 5 – based on 6 votes