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Microsoft

MS Design Lets You Put Batteries In Any Way You Want 453

jangel writes "While its strategy for mobile devices might be a mess, Microsoft has announced something we'll all benefit from. The company's patented design for battery contacts will allow users of portable devices — digital cameras, flashlights, remote controls, toys, you name it — to insert their batteries in any direction. Compatible with AA and AAA cells, among others, the 'InstaLoad' technology does not require special electronics or circuitry, the company claims."

Comment Re:Gyroscopic effect? (Score 0) 197

Only if you choose to entirely ignore the effects of the rotational refrence frame. When you compare voltage to RPM you are silently multiplying by the demsionless unit radians.

More percisely, a flywheel stores power delivered to it torsionally, a spring (I assume you were talking about a linear spring) stores force applied to it in a constant direction (work) as energy.

Linear force ought to be thought of as DC, and torsional force, AC. An ideal capacitor will store energy (much like a Hookian spring) when a constant voltage DC (force) is applied to it. An inductor will store energy in the presesence of an AC source. (It is, of course, much more complicated then that, there are edge cases in which the difference between AC and DC is dificult to discern, such as wires long enough for the speed of electrical impulse to become meaningful, cases of magnetic resonance(ie transformers) etc.)

Flywheels look like capacitors, look like springs, look like inductors etc. because the nature of force and energy is reletavely constant. However when one uses vectors rather than scalers, it becomes clear that capacitors are springs, but not flywheels, and that inductors are flywheels, and not springs.

Comment Re:Good idea (Score 0) 197

No it doesn't.

In economic terms if something can be copied without cost, then it must be ``sold'' to everyone for nothing.

Flat rate to consume for flat rate to produce makes very good common sense though. Which is better than economical sense any day; there is a very good reason economics is called the dismal science.

Comment Re:Gyroscopic effect? (Score 0) 197

Yes, and a motor is an inductor. You can measure the size of the flywheel in Henries, I've done it before, obviously not with this particular product ...

The reason it's useful to think of it as an inductor is because it is a spinning magnet; some of its energy storage potential will come from the spinning mass, but some of it will also come from the spinning magnet. The energy that is stored because the flywheel is creating a magnetic field that changes with time should be thought of as arising from inductance, as it arises in an undeniably ``inductive'' way.

Comment Re:Gyroscopic effect? (Score 0) 197

It looks like the flywheel itself has an integrated magnet, so it's basically a generator.

In that case, it is an inductor. A really really big inductor, that happens to store it's energy mechanicly.

The implication is that energy storage is determined by the product of the angular and magnetic moment, so it can store more energy at a given angular momentum than a purely mechanical flywheel. So perhaps the torsional effect is kept low enough that it doesn't affect handling.

Comment Re:Gyroscopic effect? (Score 0) 197

The problem with gimbals is that you need 4 of them, and energy extraction is somewhat dificult.

Another solution is to use two flywheels that rotate in oppisite directions on the same shaft. This might be more able to produce the anti-roll effect you're looking for, energy could be transfered between the wheels to provide whatever angular force was necessary.

I am also not a MechE.

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