Running in Sensorless Woes

[snyggis]

Howdy,

Spending my Christmas break playing with the O-Drive! v3.5-48v firmware v0.4.1-dev. I am having trouble getting going in sensorless mode. I am carefully following the instructions but am stuck with setting this parameter:

odrv0.axis0.sensorless_estimator.config.pm_flux_linkage

So checked other posts that this was missed on an early release of the firmware in August and am hoping it would be fixed in the latest update. So I tried to run the firmware update ~$ odrivetool dfu and I get a bunch of errors:

_sre.SRE_Match’ object is not subscribable - About 50 times

Then an exception “could not find any fimware release for this board version”

Does anyone know what I can do to fix this?

Thanks!

Scott

[Jerry.Atrick]

Hi Scott, try this

Sensorless mode

A new ODrive feature is ready for testing: Sensorless mode. This mode lets you run motors without and enocder. To do this we sacrifice two things: reduced accuracy as compared to an optical encoder, and lack of precise control at low speeds. On the accuracy side, very preliminary results on this seems to indicate around 0.5 degrees 1-sigma error on my 7 pole pair motor. On the low speed control: The minimum speed that supports good control is not yet established, but it will depend on the kv o…

Hope this helps
Regards Jerry

[snyggis]

Thanks Jerry, but still stuck. Those are the same instructions that I have been following.

When I enter:
odrv0.axis0.sensorless_estimator.config.pm_flux_linkage

I get the error ‘RemoteObject’ object has not attribute ‘config’

I think this is a problem with the firmware, but I cant update the firmware with the dfu tool. Still stuck.

[Jerry.Atrick]

Hi if you have been following the written process, and still NO luck; you might wish to join the discourse chat.

Come chat with us!

In order to provide a direct way for people to chat, and better support things like security, moderation and fancy things like voice and video chat, desktop sharing, etc, I have established a Discord server. If you already have a Discord account, you can join us by visiting this link: Create a User, or Sign-in to Discord - Connect to ODrive #general This link will also allow you to create a new Discord account should you desire to. It is not necessary for you to create an account in order to…

Others have found this very useful.

Regards Jerry