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experiment 3 - Introduction In this experiment we learned...

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Introduction In this experiment, we learned about the D.C generator. The main topic concentrated is on energy converter. An A.C machine is used to convert the mechanical motor energy into electrical energy. We can use this electrical energy in any form but for this lab we changed this into heat by connecting load resistors. There are three different field winding generators (shunt, series &compound). If the generator is only operated by shunt then it is called shunt generator and if it is used by series then it is called series generator. In some cases both of them are used then it’s called compound generator. The shunt field is connected in parallel with the armature, and series field is connected in series with the armature. The Shunt field has higher resistance than the series field. Cumulative operation and differential operations are the two possible types of compound generators. In general the series field assists the shunt field, but in later experiment we can see it opposes it. Purpose The purpose of this experiment is to study and obtain the no-load saturation curve and the load curves of a D.C. generator. Equipment The equipment used in this lab AC 3-phase synchronous machine (motor). To drive the shaft of the DC generator this motor is good source of constant speed. This DC machine was connected separately as excited generator using the shunt field. The power supply to the synchronous motor and shunt field of the generator is generated from P.O.S. The CDAS was used to collect data. AC Motor: Westinghouse 15KVA, 220/110VAC 3 , 1200RPM, .8PF, 60Hz DC Generator: Westinghouse 15hp, 115VDC, 113A, 1200RPM
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Connection Diagrom from lab Manual
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Report/Figures: A. Open Circuit Saturation Curve Figure 1 i) V oc vs. I field (I field is of the DC machine)
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The open circuit voltage versus field current curve is shown in Figure 1. From the figure, Voc is linear with respect of If. If is manually tuned and Voc is determined by the flux linkage between stator and rotor. This linear relation reflects the intrinsic dependence of rotor electro motion force generated by rotating the windings in the constant field of the stator of the DC machine.
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