Principles of Direct Current Machines

Cover Principles of Direct Current Machines
Principles of Direct Current Machines
Alexander Suss Langsdorf
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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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