Recent content by Gödel

Here's a few more details on predicting motor iife vs. voltage http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/16125/ExtendingElectricMotorLife.pdf It seems if you run your motor at 33C above design winding temp you'll get 10% of the rated lifetime. Since motor winding temp rise...

You don't seem to have much compassion, but maybe there's more to it. People who subscribe to this belief http://www.amazon.com/Belief-Just-World-Fundamental-Delusion/dp/0306404958 tend to blame the victim. It's especially bad when judges have it.

According to this http://www.nextag.com/USB-microscope/stores-html and using Excel's average and quartile function on a sample of the first 7 prices tells me that the average price is $106 and 3/4ths of the prices are between $56 and $113. So to avoid a POS you probably need to spend more...

With power off, check that the fan blades turn freely. I can't see a reason for conserving the elec. power into the charger, and a thermal switch costs money, so I'd say it's more likely than not that the fan should be running. If the case is warm, some components inside may be quite hot.

They don't seem to tell you how much input current the 5v control supply needs to source to give you a linear control curve, input V vs. output V. I s'pose it's an oversight.

In general: How can they modify the RPM vs. Torque curve of the motor they drive? What can they not modify about the motor's performance? TIA.

This link is the mother of all calculators. . .and the Cardanic equation it mentions may have come in handy a few months ago when I needed to solve a cubic equation. Muchas gracias! As far as 'people power', it's ~35W for 16 hours [based on Calorie consumption] and almost anyone can do 1 hp for...

Never built one. I'd estimate building, testing and debugging the first version of such a thing would probably take a morning, not including fetching the parts. Start with a very light drag and see if the numbers make sense as far as matching the rpm/torque curve of your motor. You could...

Here's the classical picture for one...

Somebody probably has posted on the 'Net a tech report on weight vs. tire life, possibly for this type of tire. It's probably related to the sidewall flexing which causes heat which causes failure. I'd be interested in whether increasing the weight by 10% decreases the life by 10% or whether...

Here's another take on this http://www.analyticcycling.com/ForcesPower_Page.html

Is this for a reasonable service life (how many hours?) until blowout or until some minimum tread depth? And, "As a rule of thumb, tire life decreases 10 percent for every 10 percent it is under-inflated."

~2200 lbs with driver 18.7 kW at constant torque up to around 3000 rpm and then constant horsepower (hp) up to 6000 rpm. a single reduction of around 6.3:1 Knowing the drive wheel radius (usually around 11"), drag coefficient, and a few simple physics formulas one should be able to predict...

So a five to eight mile range. Somewhere on this forum will be users' experiences of how many watt-hours/mile and watt-hours/mile per pound of vehicle weight they have achieved. With these samples you can judge the likely size of the batteries required, and the rest will follow. Air drag at 15...

I used incand. bulbs for this in series with the transformer primary. 100W was pretty much the same as no limiter at all and 25W gave significant slowing. But there was no electronics in the controller. The actual power dissipated in the bulbs in these instances is not easy to calculate. I...