Doug Goncz
May4-06, 05:00 AM
Hello, and good morning, spr.
One of the problems I had with the MOEPED 2, a bicycle with onboard 150
W motor/generator in parallel with 300 F at 20 VDC, was that the
voltmeter wire shorted at the meter and current was limited by the lead
wires, burning a patch on the capattery case. Sure, I should have
fused the line.
There's a better way. A divider at the voltage source would reduce the
20 VDC to 0.2 VDC for presentation on a DPM. Shorting the output of
this divider would increase the current through the divider by only 1%.
That would be safe.
I am designing MOEPED 4 with a front hub motor/generator of brushed,
gearless design and 150 F at 40 VDC. There is the possiblity of
production of this model, and a demo is planned for 2009 at MIT's ESG
reunion in Cambridge, MA.
Where can I get some appropriate 100:1 200:1 dividers and 5 and 50 A
shunts?
The shunts would "convert" 5 A to 50 mv, for example. I have a 50 A
shunt from Allelectronics.com at $12.00 and a 100 A meter for about the
same price, but need a non-surplus source at a similar price level.
150 F at 40 VDC. Hm. That's 1/2 C V V or 75 * 1600 or about 80 * 1600
or 128,000 joules. Around 100 kilo-foot-pounds. Enough to coast up a
pretty good (few hundred foot) hill with a vehicle of less than 300
pounds all up.
I had a chat with a Marlyand Metrobus driver about the latest purchase
of hyrbid busses by WMATA. It seems we will only see the LNG and
clean-diesel busses here in VA, but I travel to Rockville, MD weekly,
so I will be keeping an eye on that hybrid technology.
The MOPED series are human-electric hybrids designed to "round off the
hills" and power comm and nav while parked. Nav on these vehicles
includes at a minimum the ability to use map software to route from
point A to B and display a profile of the route. I've experimented with
determining the energy requirements of a bicycle along such a route. On
our rides, my brother and I frequently discuss the strategy of
maintaining altitude at the expense of some extra distance travelled.
With gas near $3.00 in the US, we will all be riding vecolcars soon.
Doug Goncz
Replikon Research
Falls Church, VA 22044-0394
One of the problems I had with the MOEPED 2, a bicycle with onboard 150
W motor/generator in parallel with 300 F at 20 VDC, was that the
voltmeter wire shorted at the meter and current was limited by the lead
wires, burning a patch on the capattery case. Sure, I should have
fused the line.
There's a better way. A divider at the voltage source would reduce the
20 VDC to 0.2 VDC for presentation on a DPM. Shorting the output of
this divider would increase the current through the divider by only 1%.
That would be safe.
I am designing MOEPED 4 with a front hub motor/generator of brushed,
gearless design and 150 F at 40 VDC. There is the possiblity of
production of this model, and a demo is planned for 2009 at MIT's ESG
reunion in Cambridge, MA.
Where can I get some appropriate 100:1 200:1 dividers and 5 and 50 A
shunts?
The shunts would "convert" 5 A to 50 mv, for example. I have a 50 A
shunt from Allelectronics.com at $12.00 and a 100 A meter for about the
same price, but need a non-surplus source at a similar price level.
150 F at 40 VDC. Hm. That's 1/2 C V V or 75 * 1600 or about 80 * 1600
or 128,000 joules. Around 100 kilo-foot-pounds. Enough to coast up a
pretty good (few hundred foot) hill with a vehicle of less than 300
pounds all up.
I had a chat with a Marlyand Metrobus driver about the latest purchase
of hyrbid busses by WMATA. It seems we will only see the LNG and
clean-diesel busses here in VA, but I travel to Rockville, MD weekly,
so I will be keeping an eye on that hybrid technology.
The MOPED series are human-electric hybrids designed to "round off the
hills" and power comm and nav while parked. Nav on these vehicles
includes at a minimum the ability to use map software to route from
point A to B and display a profile of the route. I've experimented with
determining the energy requirements of a bicycle along such a route. On
our rides, my brother and I frequently discuss the strategy of
maintaining altitude at the expense of some extra distance travelled.
With gas near $3.00 in the US, we will all be riding vecolcars soon.
Doug Goncz
Replikon Research
Falls Church, VA 22044-0394