by Former Oceano » 16/01/08, 19:36
Going back to the frequency of the dynamo, 5Hz seems really too low.
I'm going to take my mountain bike. To study this, without oscilloscope or frequency meter, I will try to calculate this at best ...
The developed wheel is precisely 2,045 m (I measured it precisely to calibrate my electronic meter).
At 25 km / h, the wheel will make 25 / 000 / 2,045 = 3600 revolutions per second.
The diameter of the head of the dynamo is 2,02 cm (measured with the caliper). Each time it travels, it travels ft.D cm on the sidewall of the tire, or 6,346 cm per revolution.
It is applied on the sidewall at 32 cm from the axis of the wheel. One wheel revolution represents 2.pi.R or 2,011 m.
The head of the wheel therefore makes 201,1 / 6,346 = 31,7 revolutions per wheel revolution.
At 25 km / h, the dynamo rotates at 3,4x31,7 = 107,78 revolutions per second, roughly 108 revolutions per second.
The frequency can only be a multiple of 108 Hz depending on the number of elements making up the internal winding of the dynamo.
Either 108Hz or 216 Hz or n.108Hz ...
In short in the case of my ATV, the frequency would be:
(nv31,7) / (2,045.3,6) Hz where v = speed in km / h and n = nb coil elements, 1 2 or 3.
To do the 5 Hz announced with my dynamo and n = 1, my mountain bike should advance at 1,16 km / h.
0 x
[MODO Mode = ON]
Zieuter but do not think less ...
Peugeot Ion (VE), KIA Optime PHEV, VAE, no electric motorcycle yet...