Thanx for your comments,
In the meantime we added some features to the programm. I will make an english version so that u guys can handle it as well...
The mistake u discovered actually is not a mistake. The speed of the magnets at different Diameters does not matter at all. It also took me a while to understand the reasons an dit is not so easy for me to explain in a foreign language but I give it a try:
Usually the coils in the stator are placed directly next to each other, without much space between them. If u now move them to a greater radius, I agree that the magnets pass them with more speed and thus also the output is supposed to be higher...but this is not the case. If the number and dimensions of the coils remanis the same, there will then be some space between the coils. The magnets are "faster" but they still strike the same amount of copper in the same time span. The sine wave would be higher as the speed is higer, I agree. The maximum voltage will also be higer BUT the sine wave will be shorter in length because there is space between the coils. When rectifying, the output voltage will remain the same. If u fill the gaps between the coils with more coils, of course the output will be higher but as long as this is not done, there will be no change at all.
in order to understand this, u hae to ask your self: What happens at the time when the magnets go oder the gap between the coils...
Nothing at all!!!
If you move the coils together and thus bring them on a smaller circumference so that they are directly next to each other, then the flux between the magnets is "used" all the time which is not the case in the example i stated before. In the end it will all be the same due to rectifying process. SO it is a bad idea to habe space between the coils. It doesent change anything but making the generator bigger in size.
I filled in the numbers of my last generator. The programm gave me charging voltage at 142 RPM. In real life it is 136 to 140 RPM. I find this close enough.
I also filled in the numbers fpr my 6 KW Generator. Also here the numbers match very well so far. I plan to reach 250 volts at 55 RPM. I will report if this will be the case when i have finished the machine. The resistance of the coils is 5.1 Ohms. The tool calculated 5.03...also quite close.
In the new version the weight of copper is calculated and the design is changed a little. Now fileds for hight of coils turn red if it is too much and one can set numbers for the airgap between magnets an stator as well as for the thickness of Material over the coils after casting. That makes thinx a lot easier.
The latest (german) version can be downloaded on the website of a friend with who i made the tool together:
http://www.nadaparasiempre.com/hobbies/wind-energy/generator/index.htmlWhat i discoverd on this new design of the bord is that the file I uploaded in my first post can only be seen and downloaded if one is logged in. For users not logged in it is invisible...
Max