Galvanometer instead of Servo?

[B.Glen]

Has anyone ever used a moving coil galvanometer (volt meter) instead of a servo? Would it work as a silent alternative? Any ideas about control issues?

[lasernerd]

For what purpose?
each have there high points

[Adrenalynn]

>> each have there high points

That's the point where you elaborate on your opinion, Laser'

[lasernerd]

>> each have there high points

That's the point where you elaborate on your opinion, Laser'

in which application??

A galvo is a more precise movement
Where a servo has more power less precision
based on many factors

"just my opinion"



galvo's depend on optical sensors "closed loop"
for position detection

servo's use a mechanical means for postion detection
or optical counting


for meter movement obviously you dont need optical detection for scale,,

[Adrenalynn]

So they could very well work as a "silent alternative" for lighter torque applications. I'm sure there are other options for detecting position outside of optical. A potentiometer comes to mind.

What control issues might the OP face?

[lasernerd]

So they could very well work as a "silent alternative" for lighter torque applications. I'm sure there are other options for detecting position outside of optical. A potentiometer comes to mind.

What control issues might the OP face?

A pot is mechanical

Optical position can be impaired by dust, ext. light illumination

yes,for sure a galvo can be very quit at lower speeds

but at 40K points per second they can become squealer!

[Adrenalynn]

Sealed optical positioning is immune to both forms of impairment you note, and would probably be worth exploring in that application.

Sure, pots are mechanical. They're also a "good ol' standby", and with the "right" D/A can be quite worthwhile in some applications.

I've heard meters squeal, but they're still not as loud as an HS-805.. ;)

[lasernerd]

yep,
thats why they have there own dutys