The book Principles of Direct Current Machines was written by author Alexander Suss Langsdorf Here you can read free online of Principles of Direct Current Machines book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Principles of Direct Current Machines a good or bad book?
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150 PRINCIPLES OF DIRECT-CURRENT MACHINES constant terminal e. M. F. Must be greater than (AT) in order to compensate : (a) The ohmic drop, or drop in potential, caused by the flow of the current through the resistance of the armature. (b) The demagnetizing effect of the armature back ampere- turns. (c) The demagnetizing component of the armature cross ampere-turns. (a) If the terminal e. M. F. Under load conditions is to remain the same as at no load, the total generated e. M. F. , E\, must -b...e greater than EQ by the drop i a r a, where r a is the resistance of the armature. Referring to Fig. 137, the excitation required to generate EI volts is (AT), . (b) If the armature demagnetiz- ing ampere-turns per pair of poles (corrected, if necessary, to take care of chording) amount to (AT) d, the field excitation must be in- creased over and above (AT), by v(AT) d, that is, to the value (AT) 2, corresponding to an open-circuit e. M. F. Of E 2 volts. (c) It has been shown that the cross field is due to the con- ductors lying under a pole, and that the path of the cross field is as shown by the line marked C, Fig.
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