Low-speed Servo recommendation?

[terminalcity 0]

Hello:
I'm looking for recommendations on a quiet low-speed servo motor/driver combination. The quiet part is important...
The application is a very lightly loaded indexing table. The motor drives a timing belt reduction chain, and takes very little torque to do so.

The motor has to :

- positionable over RS-232 or RS-422/485
- supply maximum of about 200RM. The low-speed and quiet performance is what is important.
- Run on a 24VDC driver or something close
- be direct drive (i.e. no gearhead-- too noisy)

I've tried an Animatics SM1720 series four motor, but since it is commutated by hall sensors it makes a real racket, squealing and squeaking below 50RPM or so.

I have seen options like the Vexta AlphaStep and and other similar drives, but I am very curious to know what a pro would spec for a low speed quiet drive.

I would be forever gratefeul for any advice!

Thanks

Daniel

 

 

 

Edited 15 Jan 2016 by terminalcity

[kaiser_will 65]

If your linear travel speed is low, and most servos growl when you drive them in the dirt, why not add a gearbox to bring overall speed into the acceptable range?  

Another consideration is a linear servo (sort of a pneumatic cylinder that is servo-driven).

https://www.festo.com/cms/nl-be_be/9802.htm

http://www.moog.com/products/actuators-servoactuators/industrial/electric/stard-electric-linear-servo-actuators/

IAI (Intelligent Actuators) has a product line that may work for you.  I integrated these some years ago to communicate RS-232 from a GE Rx3i PLC.  They work great when you need to go from known point to known point.  Not a lot of fun, though, if you need to adjust the position points on the fly or re-program the points (serial programming using their basic programming software).

http://www.intelligentactuator.com/part-search/

[gperez 0]

Have you tried running your Animatics motor in sine commutation rather than trap commutation?

Use "mds" instead of "mdt" and report back.