[ARC5] More Dynamotor Experiments

[Robert Eleazer]

I tried loading both the modified dynamotor (field coils in parallel) and the unmodified one (field coils in the original series configuration) with 20,000 ohms, 2220 ohms, and 1220 ohms.  The 1220 ohm load should approximate what the dynamotors should see while supplying B+ power to a BC-652-A.

 

With 12 VDC input and a 1220 ohm load the modified dynamotor put out 113 VDC while drawing 2.4 amps of 12VDC current.

With 14 VDC input and a 1220 ohm load the modified dynamotor put out 134 VDC while drawing 3 amps of 14 VDC current.

 

With 12 VDC input and a 1220 ohm load the unmodified dynamotor put out 107 VDC while drawing 2 amps of 12 VDC current.  

With 14 VDC input and a 1220 ohm load the unmodified dynamotor put out 131 VDC while drawing 2.4 amps of 14 VDC current.

 

So, you can see that changing the field coil wiring made remarkably little difference.  Perhaps the modified dynamotor will be better able to handle small load variations due to adjusting the receiver volume control, but right now I don't know.

 

The above data is subject to probably small changes since I found that at the higher input current levels the jumper leads I was using might induce losses on the way to the dynamotor.  I'll see if I can substitute some 12 gauge wire to correct that.

 

Wayne

WB5WSV        
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