Directory:Bedini SG:Replications:Jim:Data:Exp3

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Exp. 3 Plotting Ohms Versus Amps and RPM

'Experiment 3 from Jim's Replication of John Bedini's Directory:Bedini SG'

Exp 3: Determine Optimum Base Resistor


I ran a series of tests to determine the best value for the base resistor that would cause the wheel to rotate at the highest rate per amp of input current. From preliminary tests, plus comments from Peter and John, it was obvious that there would be a sweet spot in the 500 to 600 ohm range. I took a few more measurements in that area to pinpoint the best value a little more accurately.

Here is a chart of the results:

Image:JS graph r vs rpm 20041113.gif

It was determined that R = 572 was the best bang for the buck for my system. I got 225 RPM with 145 mA input current.

A few suprises, such as the abrupt increase in input current at just above our optimum resistance of 572 ohms. I can't explain why this bump exists, but there is another one at about 1k which is a little more subtle. These peaks coincide with an additional output spike on my scope. Just above 572 ohms, there are two spikes, and above 1k, there are 3. Perhaps these points are in-between states where the magnetic fields are fighting each other instead of working in sync.

One possible issue with output current measurement, for some reason my meter reads differently based on the direction of current. It could be because it is a fairly cheap meter, but in several tests, my meter read about 30 mA when the meter leads were connected one way, an 75 mA when the leads were reversed. Call me crazy, but I expected that if the leads were reversed, it would read negative of whatever the reading was the other way. I didn't bother too much with this since we are not really too concerned with the measured output current. I chalked it up to a quirk with the meter, but figured I'd note it here in case I means something.

See also

Image:Ohms v Amps v RPM SDA Bedini SG Exp10 thumbnail.gif

Directory:Bedini SG:Replications:PES:Sterling Allan:Data:Exp10.2 Ohms v Amps v RPM Chart Shows multiple stable rotation curves.

Directory:Bedini SG:Replications:Jim - Includes list of experiments and data.

Directory:Bedini SG

Directory:Bedini SG:Materials | Directory:Bedini SG:Schematic | Directory:Bedini SG:Assembly Instructions | Directory:Bedini SG:Data

Directory:Bedini SG:Replications

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