Up Time Magazine - February/March 2009 - (Page 40) Figure 4 - Low Frequency Data Figure 8 - Reverse Low Frequency Data Figure 5 - Low Frequency Data Sidebands Figure 9 - Reverse High Frequency Data Sidebands Figure 6 - High Frequency Data Signature Figure 10 - Variable Speed Low Frequency ing mode as the engine was running to charge the batteries. In Figure 6, we were able to determine that there were peaks with line frequency sidebands at a multiple of 60 times running speed. We were able to determine the source and will continue monitoring in order to see if there are any changes associated with age. At an average of 38 amps steady, the harmonic content, as shown in Figure 7, was null. In reverse at about 5mph, the results appeared as shown in Figures 8 and 9. The current was much higher, drawing over 100 amps during Figure 7 - Harmonics the test, with relatively small variations in speed (5 to 8 mph). The results also showed the same 60 times running speed signature with harmonics. The harmonic current content was similar to that in Figure 7. At varying speeds during the return to the garage, the results were as shown in Figures 10 and 11. The data was much more difficult to evaluate and the harmonic content increased, as shown in Figure 12. This data was much more difficult to analyze and the results were questionable. 40 february/march 2009
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