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Brians256 · 10-31-2004, 04:50 PM

After thinking about things, I am now more curious about the actual physical cause of the 50Hz switching noise of the D4. It cannot be electronic in nature, since electrons don't make noise.

So, is it the electromagnets vibrating as they are turned on and off? Is it vibration of the shaft as it is subjected to changing torque when the electromagnets turn on/off? Is the amplitude of the noise caused by the required travel freedom of the D4 spherical rotor? Would a traditionally axle driven rotor be less noisy for a given drive electronics type because it might be less "sloppy" ?

10-31-2004, 04:50 PM	#111
Brians256 Pro/Staff Join Date: Oct 2001 Location: Klamath Falls, OR Posts: 1,439	After thinking about things, I am now more curious about the actual physical cause of the 50Hz switching noise of the D4. It cannot be electronic in nature, since electrons don't make noise. So, is it the electromagnets vibrating as they are turned on and off? Is it vibration of the shaft as it is subjected to changing torque when the electromagnets turn on/off? Is the amplitude of the noise caused by the required travel freedom of the D4 spherical rotor? Would a traditionally axle driven rotor be less noisy for a given drive electronics type because it might be less "sloppy" ?