Seperately excited DC machine question

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SUMMARY

The discussion centers on comparing measured values from an experiment on the open circuit characteristic of a DC generator with predicted results derived from theoretical equations. The user, Phil, recorded armature voltage values at various field currents while operating the machine at 1500 rev/min. A specific example includes a measurement of 70.5 volts at a field current of 0.1A. The lack of nameplate information on the motor limits the ability to confirm the accuracy of these measurements.

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  • Familiarity with electrical measurements and graph plotting
  • Knowledge of theoretical equations related to DC machines
  • Basic skills in interpreting nameplate data for electrical machines
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cabellos
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Hi, i would be very grateful for some help...

I have recently conducted an experiment and but I am not sure how to compare the values i measured with 'predicted' results (from theoretical equations). This is for the 'open circuit characteristic of a dc generator'.

I set values for the field current and recorded values of the armature voltage. Then plotted a graph of armature voltage against field current. The only other value i have to work with is that the machine was running at 1500rev/min...

e.g. a measured value was - setting the field current to 0.1A i recorded 70.5Volts. All i want to know is how do i check this is about right?

Thanks very much,

Phil
 
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It could be correct, but without the nameplate information on the motor we can't be certain.
 

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