Doug Goncz
May12-04, 05:22 PM
<jabberwocky><div class="vbmenu_control"><a href="jabberwocky:;" onClick="newWindow=window.open('','usenetCode','toolbar=no, location=no,scrollbars=yes,resizable=yes,status=no ,width=650,height=400'); newWindow.document.write('<HTML><HEAD><TITLE>Usenet ASCII</TITLE></HEAD><BODY topmargin=0 leftmargin=0 BGCOLOR=#F1F1F1><table border=0 width=625><td bgcolor=midnightblue><font color=#F1F1F1>This Usenet message\'s original ASCII form: </font></td></tr><tr><td width=449><br><br><font face=courier><UL><PRE>Dialight has donated a white LED traffic signal module for my bicycle headlight\nexperiments. It is to be mounted with rubber windshield mounting strip into a\nhole in a bicycle fairing, which then is mounted to a bicycle. It has a great\nbeam pattern for illuminating a road. Trapezoidal.\n\nThe operating voltage is 80-135 VAC of unknown frequency. I believe I can\ngenerate this with a ceiling fan motor rated 225 rpm driven by the pedals of a\nbicycle which operate over a similarly scale range. The connection will by by\nbicycle chain from a 33-62 tooth chain ring to an eight tooth pinion on the\nmotor.\n\nAs the rotational speed increases, I expect the frequency and open circuit\noutput voltage will increase linearly. Can any of you confirm this? I think\nit\'s Faraday\'s law here in form B cross M = E.\n\nWhat one does is connect a car battery to the generator for a moment, just long\nenough to allow the current to rise on the impedance exponential to a value\nthat can magnetize the steel internal rotor. Then, although initiation is by\npermanent magnet action in the rotor, induction motor action prevails at speed,\ngenerating powerful currents in the rotor. An external capacitor is required to\nkeep it going, but no AC or DC field input is required.\n\nAs the AC motor is wound externally, I expect its resistance to be lower than\nthe DC generator I already have. More room for larger wires and all that. I\nwill report if I can get some figures, most likely a weighted bit of bicycle\nchain under the influence of gravity, generating large accelleration in the\nsystem and a measureable photographable trace on the oscilloscope with V and F\ntaken off with dividers. Or, since I can operated the pedals while parked, a\nfew rotations under leg power. You see, the bipod kick stand has a wooden brace\nbeneath it, without which the legs would spread and fail under my weight.\n\nAnyway, it\'s an intriguing opportunity, as the chain of DC generator to\ninverter to AC operated LED power supply to DC operated LED under current\nreguation has certain losses, and I don\'t exactly know where they are....\n\nThe motor, purchased from Surplus Center, has actually got a 17mm shaft and I\nam sending it out for machining to 5/8 inches. Surplus Center, which by now has\nprobably corrected the listing, offered compensation for my inconvenience. How\nnice of them. Arnie, I think it was, there. After turning to 5/8, I am to slot\nthe shaft for the pinion using a jig and techniques pictured at:\n\nhttp://users.aol.com/DGoncz/MotorGenerator\n\n\nYours,\n\nDoug Goncz ( ftp://users.aol.com/DGoncz/ )\n\nRead about my physics project at NVCC:\nhttp://groups.google.com/groups?q=dgoncz&scoring=d plus\n"bicycle", "fluorescent", "inverter", "flywheel", "ultracapacitor", etc.\nin the search box\n\n</UL></PRE></font></td></tr></table></BODY><HTML>');"> <IMG SRC=/images/buttons/ip.gif BORDER=0 ALIGN=CENTER ALT="View this Usenet post in original ASCII form"> View this Usenet post in original ASCII form </a></div><P></jabberwocky>Dialight has donated a white LED traffic signal module for my bicycle headlight
experiments. It is to be mounted with rubber windshield mounting strip into a
hole in a bicycle fairing, which then is mounted to a bicycle. It has a great
beam pattern for illuminating a road. Trapezoidal.
The operating voltage is 80-135 VAC of unknown frequency. I believe I can
generate this with a ceiling fan motor rated 225 rpm driven by the pedals of a
bicycle which operate over a similarly scale range. The connection will by by
bicycle chain from a 33-62 tooth chain ring to an eight tooth pinion on the
motor.
As the rotational speed increases, I expect the frequency and open circuit
output voltage will increase linearly. Can any of you confirm this? I think
it's Faraday's law here in form B cross M = E.
What one does is connect a car battery to the generator for a moment, just long
enough to allow the current to rise on the impedance exponential to a value
that can magnetize the steel internal rotor. Then, although initiation is by
permanent magnet action in the rotor, induction motor action prevails at speed,
generating powerful currents in the rotor. An external capacitor is required to
keep it going, but no AC or DC field input is required.
As the AC motor is wound externally, I expect its resistance to be lower than
the DC generator I already have. More room for larger wires and all that. I
will report if I can get some figures, most likely a weighted bit of bicycle
chain under the influence of gravity, generating large accelleration in the
system and a measureable photographable trace on the oscilloscope with V and F
taken off with dividers. Or, since I can operated the pedals while parked, a
few rotations under leg power. You see, the bipod kick stand has a wooden brace
beneath it, without which the legs would spread and fail under my weight.
Anyway, it's an intriguing opportunity, as the chain of DC generator to
inverter to AC operated LED power supply to DC operated LED under current
reguation has certain losses, and I don't exactly know where they are....
The motor, purchased from Surplus Center, has actually got a 17mm shaft and I
am sending it out for machining to 5/8 inches. Surplus Center, which by now has
probably corrected the listing, offered compensation for my inconvenience. How
nice of them. Arnie, I think it was, there. After turning to 5/8, I am to slot
the shaft for the pinion using a jig and techniques pictured at:
http://users.aol.com/DGoncz/MotorGenerator
Yours,
Doug Goncz ( ftp://users.aol.com/DGoncz/ )
Read about my physics project at NVCC:
http://groups.google.com/groups?q=dgoncz&scoring=d plus
"bicycle", "fluorescent", "inverter", "flywheel", "ultracapacitor", etc.
in the search box
experiments. It is to be mounted with rubber windshield mounting strip into a
hole in a bicycle fairing, which then is mounted to a bicycle. It has a great
beam pattern for illuminating a road. Trapezoidal.
The operating voltage is 80-135 VAC of unknown frequency. I believe I can
generate this with a ceiling fan motor rated 225 rpm driven by the pedals of a
bicycle which operate over a similarly scale range. The connection will by by
bicycle chain from a 33-62 tooth chain ring to an eight tooth pinion on the
motor.
As the rotational speed increases, I expect the frequency and open circuit
output voltage will increase linearly. Can any of you confirm this? I think
it's Faraday's law here in form B cross M = E.
What one does is connect a car battery to the generator for a moment, just long
enough to allow the current to rise on the impedance exponential to a value
that can magnetize the steel internal rotor. Then, although initiation is by
permanent magnet action in the rotor, induction motor action prevails at speed,
generating powerful currents in the rotor. An external capacitor is required to
keep it going, but no AC or DC field input is required.
As the AC motor is wound externally, I expect its resistance to be lower than
the DC generator I already have. More room for larger wires and all that. I
will report if I can get some figures, most likely a weighted bit of bicycle
chain under the influence of gravity, generating large accelleration in the
system and a measureable photographable trace on the oscilloscope with V and F
taken off with dividers. Or, since I can operated the pedals while parked, a
few rotations under leg power. You see, the bipod kick stand has a wooden brace
beneath it, without which the legs would spread and fail under my weight.
Anyway, it's an intriguing opportunity, as the chain of DC generator to
inverter to AC operated LED power supply to DC operated LED under current
reguation has certain losses, and I don't exactly know where they are....
The motor, purchased from Surplus Center, has actually got a 17mm shaft and I
am sending it out for machining to 5/8 inches. Surplus Center, which by now has
probably corrected the listing, offered compensation for my inconvenience. How
nice of them. Arnie, I think it was, there. After turning to 5/8, I am to slot
the shaft for the pinion using a jig and techniques pictured at:
http://users.aol.com/DGoncz/MotorGenerator
Yours,
Doug Goncz ( ftp://users.aol.com/DGoncz/ )
Read about my physics project at NVCC:
http://groups.google.com/groups?q=dgoncz&scoring=d plus
"bicycle", "fluorescent", "inverter", "flywheel", "ultracapacitor", etc.
in the search box