I want a servo motor to move/rotate a set distance and hold position (bear weight:which for my uses would be minimal) and then when power isn't applied/cut-off it drives back to original position. I'm trying to do this with a minimal amount of equipment. How could I go about doing this?
4
-
\$\begingroup\$ If power is cut-off, how can you expect it to "drive back to the original position". Even with springs to pull it back, stiction will make a significant error. You need power to drive it back accurately. \$\endgroup\$– Andy akaCommented Aug 30, 2015 at 22:57
-
\$\begingroup\$ @Andyaka The original position can be defined by a mechanical stop. \$\endgroup\$– Nick AlexeevCommented Aug 30, 2015 at 23:02
-
\$\begingroup\$ @NickAlexeev my comment is a challenge to the OP to think about what he's saying in terms of "no power" and "accuracy". \$\endgroup\$– Andy akaCommented Aug 30, 2015 at 23:26
-
2\$\begingroup\$ possible duplicate of Braking a DC brushed motor \$\endgroup\$– Mark BoothCommented Sep 1, 2015 at 15:58
Add a comment
|
1 Answer
\$\begingroup\$
\$\endgroup\$
This sounds more like an application for a pneumatic or hydraulic actuator than a servo motor. A bleed valve could open when power is lost, allowing the load to return to the original position, under gravity, in a controlled way.
Having said that, if the load isn't too heavy, you might be able to use electrical braking. For more details than I can provide, see Russell McMahon's excellent answer to Braking a DC brushed motor
answered Sep 1, 2015 at 15:58