![]() ![]() The influenceof the armature windingrnmf.onmachinebehavioris exploredwith particularemphasis on its effecton cnmmutationand its externalcharacteristics.The subjectof commutation occupiesa position of preeminencein the study of d-c rnachinesbe-Ĭause without good commutation the machine is rendered almost useless.The motor speed-torquecllrves are analyzed anri ¿rlsothe various methods of speed coltrol. Here rveinvestigatethe operationalcharacteristicsof the yarioustypes of d-c machines,beginningwith a descriptionof how the direct voltageis obtained. The principlesunderlyiugbasictorque productionanclinducedvoltagesin the d-c machineare outlined in detail in Chapter 3. Unfortunately, the need for a mechanicalrectifier(in the form of a commutator)to convertthe a-c emf that is inducedin eacharniaturecoil to a unidirectionalvoltagemakesit oueof the leastruggeci of electricmachines¿s well as moreexpensive. ![]() Theseare featnresthat are responsible for its usein the really tough jobs in industry, such as are found,in steel mills. It is capableof quick reversals, and speedcontrolovera'rangeof 4 : I is achievedwith relative rvith all otherelectromechanical easein comparison energy-conyersion devices. It can provide high starting torquesas well as high acceleratingand deceleratingtorques. The d-c machineis a highly versatilemachine.
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