Ultrasonic / Silent-Wave Motor Teardown

In this video, a ultrasonic motor, taken from a Nikon lens, is torn down.
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[@fr3zer677]

The spinning coin analogy was very helpful!

[@DavidMarshall2]

The detailed teardown followed by explanation of how it works was excellent, very clear and exactly what I wanted to know. Great video!

[@martinpersson4996]

I have been curious about these motors for a long time, but never got around to taking one apart. The explanation using the coin was ingenious! Many thanks for an excellent video!

[@demidrol5660]

Thank a lot!!!

[@sabekinawalinseefat8243]

Thank you so much for this! Excellent one! Keep it up!

[@Theobservertimes]

Very helpful video, thank you!

Do you know why and how these motors fail?

[@couplesbikeadventure9580]

is there a resistance between terminal on that motor?

[@cristocontreras3240]

Hi. Great video. Thank you. Wanted to ask what would you suggest for cleaning both insides of inside metal? I have couple of motors and I used methylated spirits and think this might not of helped

[@BrendaEM]

I am not sure. In the one I took apart, there was a race of ball bearings, which needed lubricant of some kind, after they are cleaned. Whatever is used will have to be pretty thin. I am not sure if even sewing machine oil is light enough. I think that that this is the only place in the motor where there should be any lube. The alcohol could have attacked plastic, if soaked, but I am surprised if any were damaged short term. There is a sandwiched layer between metal that needs not to be attacked by whatever you use. Apparently, methylated spirits may contain not only alcohol, but other chemicals or additives/constituents/adulterants that might have left a film on the motor working surfaces. A great deal of how the motor operates is by friction, so on either metal contact surfaces , it would seem that they should be clean with no oil at all. With one of the motors that might not work anyway, I might try either either 90% isopropyl alcohol or spray carburetor cleaner on most of of the motor, keeping anything from dripping from the bearing. Afterwords, I might try not even one drop of sewing machine oil on the bearing. I use it for my skateboard bearings. It can't be so much that it can contaminate the round disk-like contact surfaces.

[@visualchallenge2413]

Good video ! By the way, you didn't give me a feedback concerning my second comment on the Logitech C905 teardown video :)

[@BrendaEM]

I am sorry about that. I made a mistake. I check for replies on 2 computers and my cellphone. Sometimes, I get a reply on the cellphone app sooner or later than the others, and I think that I "thought" that I already saw your reply. To my defense, I have a lot going on right now, and very little of it good. Still, it looks like I did comment on your second attempt, but I failed to comment on the UV idea.

[@visualchallenge2413]

Thanks ! I was sure you missed my comment. I feel bad that you justified :(

[@BrendaEM]

@@visualchallenge2413 , I am sorry sorry that I did anything to make you feel bad.

[@totoxahc]

Nice teardown, but I doubt the "deformation" is physical. It must be a rotating electromagnetic field. Also the audio is way too low.

[@BrendaEM]

Thanks. Sorry about the audio. The deformation is physical. The class of devices these are, are strain-wave gearing. en.wikipedia.org/wiki/Strain_wave_gearing