Consider a dc shunt motor connected to a constant-voltage source

Consider a dc shunt motor connected to a constant-voltage source

Consider a dc shunt motor connected to a constant-voltage source and driving a load requiring constant electromagnetic torque. Show that if Ea > 0.5Vt (the normal situation), increasing the resultant air-gap flux decreases the speed, whereas if Ea < 0.5vt=”” (as=”” might=”” be=”” brought=”” about=”” by=”” inserting=”” a=”” relatively=”” high=”” resistance=”” in=”” series=”” with=”” the=”” armature),=”” increasing=”” the=”” resultant=”” air-gap=”” flux=”” increases=”” the=””>

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