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"Bike Generator" Project
Russ, N0BTI wanted to cut his bordom while doing his daily exersise. This is what he came up with. It charges a battery that powers a small portable TV set.
If anyone wants a real close up of this image, email Russ, N0BTI. You can get his email address from QRZ.com
"The output of my generator, which is a permanent magnet DC motor, can be as high as 120 volts DC. I wish to run this generated current into a 13.8 volt storage battery."
"I attached my permanent magnet DC motor to my drill press. At about 850 RPM (2:1pulley-1725 RPM drill press motor), two 12 volt headlights connected and a voltmeter/amp meter also connected. I read 14 volts at the motor and 12.5 volts at the lights. 7.8 amps total current. I'm using flimsy test leads so I'm losing 1.5 volts. The leads do get warm quickly. The motor is rated at 110 volts DC at 12 amps and 3100 RPM. This motor came from a high end treadmill. Perhaps I don't need a regulator after all. Open circuit volts at 850 RPM is 29+/-. Think I should just forget about a regulator? I suppose the next step is hook it to a car battery and see what happens. I will need a hefty blocking diode to keep the battery from trying to run the motor I think."
"Well I completed my bike generator project mostly. Don't need a regulator for battery charging. It works just fine hooked direct through a diode. Without the diode, the motor runs backward. The diode I'm using is 10 amps and 6 ohms forward resistance. Going to try Radio S. for one with less forward ohms. As it is, I'm able to pump 3 amps into the battery at a generator voltage of 14.5. It's really quite a bit of work though and thatís only 43 watts of power. I have read that a person in good bike shape can do 80 watts continuous. Maybe Lance Armstrong."
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