Minimum RPM: 15 deg/hr?

Noobie here. I’m considering an oDrove but need to be sure it can operate at extremely low RPM (eg. 15 degrees / hr). I need to drive a 3 phase 12 pole large BLDC (Fisher & Paykel Smartdrive) .
Any ideas if this is even possible given BLDC’s are usually high RPM?

With a high enough resolution encoder, maybe it will work. What is your application? If it is a telescope drive or something similar where you are trying to keep a star stationary on your camera, having encoder increments similar or smaller than the angular size of a star is useful (say 3 arcseconds or smaller). It is definitely possible as some off the shelf telescope mounts have direct drive BLDC motors with encoders controlled in a similar way to oDrive. Sensorless control wont work at this low of an RPM so some wort of position feedback will be needed.
Hope that helps


Thanks, good to know it’s possible. I’m using 18 bit absolute encoders interfaced with a RPi so can control the motors with that too for a closed loop. Time to place my order…

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The ODrive will need some form of encoder feedback and will control the motor in closed-loop. Have a look on the wiki to see what encoders are currently supported.

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