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DC flywheel battery
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Procedure

  1.  After reading the Theory material and completing the Self Evaluation, click on the RT tab.
  2.  Click the “Start” button.
  3.  Set a RPM using the slider (800 to 1400 rpm). 
  4. To accelerate the flywheel, click "Accelerate" button
  5. When the chosen RPM is attained (t1 until here), click the "Decelerate" button to decelerate the flywheel back to zero rpm(t2 until here).
  6. Click the "Stop" button to stop the experiment.
  7. Click the "Export" button to export data. 
  8. From the exported data, the current, voltage and rpm values corresponding to t1 and t2 and, using to maximum rpm value, calculate the efficiency of energy transfer in each direction.
  9.  In the spreadsheet software, create two columns. One to the right of the RPM column, and one to the right of the Voltage/Current columns.
    1.  Multiply this column by the “Delta t” time stamp to obtain the energy segments.Multiply the Voltage and the Current together to get the Electrical power input. Multiply this by the electrical to mechanical conversion efficiency. The flywheel mass is made of cast iron, with an outer diameter of 80 mm and a total mass of 0.5 kg. Using the formula given in the Theory section, the moment of inertia of the flywheel is calculated to be 0.0016. In the second new column, using the moment of inertia of the flywheel and the speed in radians as taken from the exported data, calculate the Kinetic Energy of the flywheel. Find the point in the data where the Kinetic Energy peaks. Add up all the electrical energy input energy segments from the time when the experiment starts until the Kinetic Energy peaks. Also add up all the electrical energy segments from the time the discharge starts (this can be seen in the data when the Kinetic Energy starts to decrease).
    2. The electrical input energy sum minus the losses should be the same as the peak Kinetic Energy. The electrical output energy sum minus the losses should also be the same as the peak Kinetic Energy.

 

 

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