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Registered Member #1320
Joined: Sat Feb 16 2008, 01:31AM
Location:
Posts: 67
maximum speed is the point where the force applied is equivalent to resistive forces (air resistance, friction.....) There is a lot of math that would go into finding that, but for things like friction you have a hard time predicting it.
Registered Member #222
Joined: Mon Feb 20 2006, 05:49PM
Location:
Posts: 96
Also, the amount of torque a motor can provide decreases with increasing speed.
The speed of a motor also depends on what kind of motor it is. For example, synchronous motors can only spin at 1 rpm based on input frequency. Induction motors spin at a speed that is close the line frequency divided by the number of poles. You would probably want to use a DC motor rather than AC.
You can relate power to angular speed with the equation P=torque*angular speed.
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
So for a flywheel, im looking for tensile strength, right?
If you have the money and precision to make the flywheel spin fast enough that it is limited by its bursting speed, then specific tensile strength (tensile strength per unit mass) is the thing to go for. If OTOH your speed limit is the motors/gears and you will never get remotely near bursting speed then a heavy material like steel is better, for instance for car engine flywheels or string-started toy gyroscopes.
Compulsators and FES are designed to do totally different things, or rather the same thing with a totally different emphasis. A compulsator must store a modest amount of energy, with modest charge/discharge and storage efficiency, but deliver collosal power dumping its entire charge in mS. It therefore tends to be simply a compensated alternator with significant inertia, spun up by any old motor. FES stores a large amount of energy, with very high charge/discharge efficiency and low storage losses, and delivers modest power dumping the charge in 10s of seconds (vehicle regeneration) to 1000s of seconds (wind turbine gust storage) to 10000s of seconds (day/night solar/off-peak storage). They therefore tend to be a carbon flywheel in a vacuum and small motor-nator with emphasis on losses and efficnecy rather than peak power.
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cumpulsator and FES
