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AC Generators AC GENERATOR THEORY AC GENERATOR THEORY AC generators are widely used to produce AC voltage.  To understand how these generators operate, the basic theory of operation must first be understood. EO 1.2 Given   the   speed   of   rotation   and   number   of   poles, CALCULATE the frequency output of an AC generator. EO 1.3 LIST the three losses found in an AC generator. EO 1.4 Given  the  prime  mover  input  and  generator  output, DETERMINE the efficiency of an AC generator. Theory of Operation A simple AC generator consists of: Figure 3    Simple AC Generator (a)   a   strong   magnetic   field,   (b) conductors that rotate through that magnetic field, and (c) a means by which  a  continuous  connection  is provided to the conductors as they are rotating (Figure 3).  The strong magnetic  field  is  produced  by  a current flow through the field coil of the rotor.   The field coil in the rotor  receives  excitation  through the  use  of  slip  rings  and  brushes. Two   brushes   are   spring-held   in contact   with   the   slip   rings   to provide the continuous connection between   the   field   coil   and   the external excitation circuit.   The armature is contained within the windings of the stator and is connected to the output.  Each time the rotor makes one complete revolution, one complete cycle of AC is developed.   A generator has many turns of wire wound into the slots of the rotor. The magnitude of AC voltage generated by an AC generator is dependent on the field strength and speed of the rotor.  Most generators are operated at a constant speed; therefore, the generated voltage depends on field excitation, or strength. Rev. 0 Page 5 ES-10


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