Recent content by prodriverex

Cool. You are a great tutor! Thanks! As for the detail, I have no prior experience honestly. All I know is I have to design a 2.5kW nett peak output generator and 1.5kW nominal between 4000 and 5500 rpm and 8000rpm for accidental buffer. The fundamental of my electrical design has been...

:eek: α: dω / dt = 837.758 / dt And what is dt now? I know it must be a timing of t or something, timing per rev in rad, 2∏? Argh.. My apology for being slow. TIA!

8000rpm = 8000 * 2∏ = 50,265.48 rad/min or 837.758 rad/s - and this is angular velocity. So now to calculate the Angular Acceleration, , I can use v2 / r? And r is not radius but radian as in 2∏? = 111,701 rad/s2? Then T = I * a: 0.0024 * 111,701 = 268 lb-ft2?

Good morning. I'm from another side of the earth. Ha.. Ok that make sense to me now. I is then, 0.0032 - 0.0008 = 0.0024 Let me try again on Angular Acceleration (rad/s2) again. Radian is the ratio between the length of an arc and its radius. That's what I meant. My radius is 0.04m (not...

Not to sure if you are referring to cogging effect or final motor efficiency. Yes I am concern about final motor efficiency as it will determine how useful this gen is. That is why the final product must go for further diet.. 3hp engine say 80% efficient, the gen must produce more than 2700W...

I think both. Spin up will determine how long it takes to get up to speed to reach desire power. Running at final rpm will determine the burn rate of the engine. Arc length is different as radius I know. But 1 rad is the ratio of arc length to radius.. no?

Oh my bad.. Iwhole = 0.5 * 1 * 0.08 * 0.08 = 0.0032 And what to do with the hole? Subtract by 0.000128? Ha I was taking ref from https://www.physicsforums.com/showthread.php?t=201254 and got, probably, confused too. So as in one rev = 2.∏ rad. Rad defined as the arc length =...

Thanks Tim! So the simplest formula is I = M*R2 And OD is easy as what was quoted at 0.0064 taking 0.08 as R. This is the whole As for the hole, say the bearing and spokes weigh 80gm, that will be I = 0.08kg * 0.042 = 0.000128. Nett I is thus 0.006272!? But if I put a weight to the hole...

OK I'm super frustrated.. I spent 50min typing the whole text here earlier and click preview only to be told I was logged out. Click back and and all was gone. Damn.. Ok here's the question, AGAIN. Weight: 1kg Type: Flywheel, OD is 80mm, ID is 40mm if that matters. So that's a typical...