Ultrasonic motors?

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Myself
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Ultrasonic motors?

Post by Myself » Fri Feb 16, 2018 7:43 pm

Once in a while, it would be nice to have motion without magnetic fields. Anything with a compass, for instance. Maybe you also want to drive a little needle, or unlatch a door, or.... whatever.

Camera lenses have had ultrasonic motors in 'em for years. I believe it's a ring of piezoelectric material, but haven't looked into it in much detail.

Newscale makes some totally wild little motors that use a piezoelectric twisting effect to "hula-hoop" a shaft around.

Are there other offerings in this space? How would a hobbyist get their hands on them? I feel like SFE could help here...

lyndon
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Re: Ultrasonic motors?

Post by lyndon » Sun Feb 18, 2018 11:42 am


jremington
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Re: Ultrasonic motors?

Post by jremington » Sun Feb 18, 2018 9:10 pm

Hydrostatic/pneumatic motors and cylinders come in all imaginable sizes and won't be going away, ever!

Valen
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Re: Ultrasonic motors?

Post by Valen » Wed Feb 21, 2018 2:55 pm

lyndon wrote:
Sun Feb 18, 2018 11:42 am
Muscle wires?
https://www.sparkfun.com/products/11900
Since a fair amount of current runs through such a wire, there is still a magnetic field emanating from it. Weak perhaps, but still there. If that is a problem is up for experimentation.

lyndon
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Re: Ultrasonic motors?

Post by lyndon » Wed Feb 21, 2018 8:05 pm

Good point. I was going to suggest pneumatics or hydraulics, but you'd potentially have fields from the coils of the solenoid valves.

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