Recent content by apc3161

Think of it like this. If you stand in a bucket, and then pull up on the handle, will you and the bucket lift up? The answer is no. Because when you pull up on the bucket, the bucket is also pulling down on you. In the case with your magnets, as the no.2 magnet pushes up on the no.1 magnet...

You can of course do this. The general question though is what will you be using to apply torque to the generator and spin it? Even if the source of electricity is free, such as wind, the system is not free. That is because inevitably things will break, wear down, and need repair or...

Were you looking to just design one for the sake of it, or designing one to actually manufacture? I ask because that will probably determine whether you should go with a 2D or 3D turbine. Google mit micro turbine for an example of a 2D turbine. Let me know, I have written code and could...

I could probably help. Still need help?

Could you maybe say a little bit more about that. I think this is the part that is confusing me.

Hey, I was wondering if someone could link me to a good source where I can read about electrical generator efficiencies and how they relate to RPM. I tried doing some derivations myself and came up with a somewhat believable result, but am not ready to trust myself as this is far outside my area...

great thanks! Ok, so basically by looking at the 2nd graph I provided, it seems that when one phase is supplying all the current, the other two are sinking about half of that current. So for 1/3 of the time, any phase is sourcing all the current, and for the other 2/3 of the time, it is sinking...

Ok, so more or less the current going through any 1 phase at a given time is either 0 or the current being pulled from DC. At any given time, 2 phases are supplying no current while the other is supplying all the current. Is that correct for the most part?

Oh sorry, our power is coming from an AC motor being run as a generator, not from the wall. During tests we were getting 5 VDC from our circuit. Basically, I know the thermal current that the motor windings can handle, which is why I want to figure out how much current is going through each...

Hello, I made a circuit to convert AC to DC. It looks like this. http://openbookproject.net/electricCircuits/Semi/03267.png My output DC voltage is around 5 volts. Could someone please explain to me how I could figure out the current running through each of the phases at a given time given a...

The first thing I would do is find a good graph of the efficiency of a turbine versus its specific speed. There is a good example is many turbomachinery books. I have "Principles of Turbomachinery " by Shepherd that has a good example on page 39. This will let you know whether you should...

Hello, You've all probably seen the classic Blasius solution concerning the thickness of a boundary over a flat plate. This problem though assumes that the free stream velocity is constant. http://www.see.ed.ac.uk/~johnc/teaching/fluidmechanics4/2003-04/fluids9/2-dboundary.html I am...

I'm using maple 12, the latest one I think. I'm about to go to bed now, but will look into how to convert it to an older form in the morning.

Hello, I have scavenged the internet and have not been able to figure out how to plot a series of equations in matrix form using maple. for example y = [a,b,c] * x + [4,5,6] would be y1 = a*x + 4 y2 = b*x + 5 y3 = c*x + 6 plot (y1,y2,y3 versus x). I have attached my actual...

Thanks for the reply Bob. Using the relative exit velocity would definitely seem to take care of the efficiency greater than 100% dilemma. (although it seems to create a few more questions, but I'll address those later. I have attached an example problem from the book I am reading on the...