Oscilloscope Output & AVR

[rmchambers]

I'm trying to noodle the variation thing and it's not quite clear to me.

If I have a 1500 RPM engine geared up to turn a 3000rpm head (for 50Hz as the original poster asked) that means for each revolution of the engine, the gen head is going twice that.

If the engine loads up and loses 1 rpm in the process wouldn't that double for the gen head and turn into a 2 rpm loss therefore making the head variation double that of the engine rpm variation?

That's where I'm getting stuck, what am I missing?

Robert

[Andre Blanchard]

The 1500 RPM head is generating 2 cycles per rev. and the 3000 RPM head is generating 1 cycle per rev..

(1500 / 60) * 2 = 50.000 cycles per second
(1501 / 60) * 2 = 50.033 cycles per second

(3000 / 60) * 1 = 50.000 cycles per second
(3002 / 60) * 1 = 50.033 cycles per second

[rmchambers]

Ah ok, so I'm right and you're right.  There is a 2 rpm difference on the 3000 rpm gen head BUT at 3000 rpm it makes half the difference in frequency that it would on a 1500 rpm gen head so it all works out the same.

Thanks

Robert