Difference between revisions of "Data collection"

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==Measurements==
 
==Measurements==
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{| style="width: 100%"
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{| class="wikitable" style="float: left;"
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|+ Pre-run testing on ___ /___ / 20___
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!width=240|Rotational speed<br>''(Revolutions per Second)''<br>□ Tachometer used
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!width=240|Induced AC voltage<br>''(Volts)''<br>□ Root mean square
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!|0 RPS = 0 RPM
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!|1 RPS = 60 RPM
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!|2 RPS = 120 RPM
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!|3 RPS = 180 RPM
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!|4 RPS = 240 RPM
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!|5 RPS = 300 RPM
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!|6 RPS = 360 RPM
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!|7 RPS = 420 RPM
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!|8 RPS = 480 RPM
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!|9 RPS = 540 RPM
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!|10 RPS = 600 RPM
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!|__ RPS = ___ RPM
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!|__ RPS = ___ RPM
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!|__ RPS = ___ RPM
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!|__ RPS = ___ RPM
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{| class="wikitable"
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|+ Test run on ___ /___ / 20___
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!width=100 valign=top|<br>Time<br>''{{nobr|hh:MM AM|PM}}''
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!width=100 valign=top|<br>Current<br>''Amps''
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!width=100 valign=top|<br>{{nobr|Air speed}}<br>''{{nobr|□ __/ s □ __/ h}}''
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!width=100 valign=top|<br>{{nobr|Air Temp.}}<br>''{{nobr|□ °C □ °F}}''
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!width=100 valign=top|<br>{{nobr|Coil Temp.}}<br>''{{nobr|□ °C □ °F}}''
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!width=100 valign=top|<br>{{nobr|Rotation Speed}}<br>''RPM''
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</center>
  
 
==Unit Conversions==
 
==Unit Conversions==

Revision as of 08:11, 25 April 2016

Device Dimensions

Measurements

Pre-run testing on ___ /___ / 20___
Rotational speed
(Revolutions per Second)
□ Tachometer used 		Induced AC voltage
(Volts)
□ Root mean square
0 RPS = 0 RPM
1 RPS = 60 RPM
2 RPS = 120 RPM
3 RPS = 180 RPM
4 RPS = 240 RPM
5 RPS = 300 RPM
6 RPS = 360 RPM
7 RPS = 420 RPM
8 RPS = 480 RPM
9 RPS = 540 RPM
10 RPS = 600 RPM
__ RPS = ___ RPM
__ RPS = ___ RPM
__ RPS = ___ RPM
__ RPS = ___ RPM
Test run on ___ /___ / 20___

Time
hh:MM AM
Current
Amps
Air speed
□ __/ s □ __/ h
Air Temp.
□ °C □ °F
Coil Temp.
□ °C □ °F
Rotation Speed
RPM
_____:_____
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Unit Conversions

Why care about inches?

  • In the Imperial system of measurement, inches are usually divided into halves, which means base 2 for anything shorter than 1 inch. 1/2", 1/4", 1/8", and 1/16" are commonly used measurements.
  • If you view the listings for block neodymium magnets from a supplier such as Magnet4less.com, Magnet4sale.com, or KJmagnetics.com, you can find out that magnet lengths, widths, and heights are in inches.
  • While the metric system is clearly more useful for scientific purposes, the base 2 system used for sub-inch imperial mesaurements is actually quite helpful for making interlocking assemblies composed of different-sized blocks.

Useful

  • 1 inch (in) = 2.54 centimeters (cm)
  • 1 foot (ft) = 0.3084 meters (m)
  • 1 cubic inch (in³) = 16.39 milliliters (mL) = 1.639 * 10^-5 cubic meters (m³)

Logical

  • 1 amp-hour (Ah) = 3600 Coulombs (C)
  • 1 milliamp-hour (mAh) = 3.6 Coulombs (C)
  • 1 cubic meter (m³) = 10^3 cubic decimeters (dm³) = 10^6 cubic centimeters (cm³)
  • 1 cubic meter (m³) = 10^3 liters (L) = 10^6 milliliters (mL)

Strange

  • 1 gallon (gal) = 2^2 quarts (qt) = 2^3 pints (pt) = 2^4 cups (C) = 2^7 fluid ounces (fl oz.) = 2^8 tablespoons (Tbps)
  • 2000 Calories (kCal) = 2.324 kilowatt-hours (kWh)
  • 100 Calories per 2 Tablespoons (kCal/Tbsp) = 3,930 watt-hours per liter (Wh/L)

Surprising

  • Energy of a neodymium magnet at 1.5 Tesla (T)
    • (1.5 Tesla)^2/(2*4pi*10^-7 Henries per meter) * (1.639 * 10^-5 cubic meters) = 14.67 Newton-meters (Nm) in a cubic inch
    • Conclusion: A cubic inch neomagnet, if depleted of its magnetic energy, could not even run a 15 watt light bulb for one second.
  • Energy of a AA Battery (7.7 mL) at 1.5 Volts (V) and 2000 milliamp-hours (mAh)
    • (1.5 Volts * 7200 Coulombs) * (16.39 ml / 7.7 mL) = 22,990 Newton-meters (Nm) in a cubic inch (> 1,500x)
    • Conclusion: The magnetic field energy of a magnet, if depleted, would yield less than 0.1% as much energy as a battery of the same size.
  • Energy of Peanut Butter at 100 Calories per 2 Tablespoons
    • (3,930 Wh/L) * (3600 Nm/Wh) * (0.01639 L) = 231,900 Newton-meters (Nm) in a cubic inch (> 15,000x)
    • Conclusion: Food sources of energy can be substantially more energy dense than typical battery tech.

What makes this surprise useful?

  • Sometimes online a person makes the argument that a machine is powered by magnets and that such magnets would provide energy as long as they last.
  • This argument can sometimes be used to explain away significant amounts of net work with the notion that such magnets are being spent through demagnetization.
  • In light of the fact that the energy density of neodymium magnets is less than 0.1% of the energy density of simple Alkaline battery chemistry, powering motors by utilizing the weakening of the magnet field of otherwise permanent magnets is not a plausible mechanism for explaining any output of significance.

Site map

HQ ● Glossary ● April 2016 Presentation

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