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DPChallenge Forums >> Hardware and Software >> Ultrasonic motors (USM, SWM, HSM...)
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05/06/2009 10:37:28 AM · #1
Could some of the more technically minded photographers on this forum please explain - in layman's terms - how these ultrasonic motors work?

I looked it up on Wikipedia, but the article was a bit too technical for me. What I sort of understood from that article is that they rely on some sort of vibrations caused by ultrasonic waves?

The old Nikon AF lenses used that little screw protruding out the mount to drive the rotation of the lens. That I understood: gears, cogs, and a little electric motor.

Can anyone please demystify the ultrasonic motor for me?
05/06/2009 10:41:35 AM · #2
Vibration in the stator causes motion in the rotor.
05/06/2009 10:42:35 AM · #3
Originally posted by CEJ:

Vibration in the stator causes motion in the rotor.


Try saying that 10 times quickly, lol
05/06/2009 11:23:07 AM · #4
Originally posted by CEJ:

Vibration in the stator causes motion in the rotor.


Haha. Yes. That's a neat summary of what Wikipedia said.

Now explain to me what a stator is, and how the vibrations are converted to rotations of the lens :-)
05/06/2009 11:56:20 AM · #5
Originally posted by CEJ:

Vibration in the stator causes motion in the rotor.


I told her that and she still lost focus :/
05/06/2009 12:09:57 PM · #6
Originally posted by CEJ:

Vibration in the stator causes motion in the rotor.

The pellet with the poison 's in the vessel with the pestle.
The chalice from the palace has the brew that is true.
... or something like that.

Message edited by author 2009-05-06 12:10:07.
05/06/2009 12:44:33 PM · #7
Originally posted by citymars:

Originally posted by CEJ:

Vibration in the stator causes motion in the rotor.

The pellet with the poison 's in the vessel with the pestle.
The chalice from the palace has the brew that is true.
... or something like that.


Where the hell did you get that? There appears to be quite a hole in my education.
05/06/2009 01:14:15 PM · #8
My God... It is taking less and less time for perfectly good threads to become ridiculous.
05/06/2009 01:35:42 PM · #9
Originally posted by candlerain:

My God... It is taking less and less time for perfectly good threads to become ridiculous.

bobonacus started it. ;-)

Zueszen, the pellet/poison thing is a Danny Kaye bit from "The Court Jester."
05/06/2009 02:28:58 PM · #10
Originally posted by citymars:

...Zueszen, the pellet/poison thing is a Danny Kaye bit from "The Court Jester."


Ah, and I thought it was posthuman distraction.
05/06/2009 02:41:22 PM · #11
usm-sim.gif

The stator (red) has vibration induced to it which causes the rotor (blue) to turn. Notice the stator is stationary - just vibrating and the rotor is spinning, as indicated by the white lines present on each. Not sure why you need such a technical explanation as to how it works. Action, reaction. Stimulus, response. Pure electrical magic. Numerous links from Google explain it but if you didn't understand the one on Wiki, most of the others are far more technical.

Message edited by author 2009-05-06 14:50:10.
05/06/2009 02:50:05 PM · #12
Originally posted by CEJ:

Not sure why you need such a technical explanation as to how it works.


Pure curiosity? Mine is now satisfied, anyway :-)

R.
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