We finally finished testing a few motors and wanted to share the data. Take a look and let us know what you think. Please feel free to ask questions about how we tested this.
https://www.chiefdelphi.com/media/papers/3504
Here are a few pictures of our (crummy) setup:
Thanks for sharing data.
Was the wrench horizontal when you measured the stall force on your scale? Or was it at an angle, as shown in the picture? If it was at an angle, then the scale force is a fraction of the force that was acting to turn the wrench; that fraction is the cosine of the angle of the wrench relative to horizontal.
The wrench was not horizontal. I’ve added math to compensate for this angle to Rev. 1.4 of the document.
Any insights on the 100A current limiting? As far as I know, the SRX doesn’t do this unless you enable the peak/continuous current limits. It also may mean the stall current/torque of the NEO at 12V is higher than the controller allows for.
Unfortunately that’s a question for REV. I don’t have that level of insight into the motor controller firmware to be able to tell you.
Thanks so much for the preliminary tests. This is really insightful and the motor looks really promising.
Has anyone tried to break one of these motors yet by pushing it to its limits and browning it out? I’m assuming it is case cooled since I don’t see any fan slots and I am interested in seeing if it has the thermal hardiness of it’s cim counterpart.
In regard to this data do you think we will see more 3NEO motor gearboxes (game applicable)?
You’re welcome! I don’t think browning out the motor is really where the limitation of the motor resides. I’m more worried about full stall for long periods of time (multiple seconds). Purely anecdotal evidence shows that the NEO remained significantly cooler than its Mini CIM counterpart under similar driving conditions. We’ve also experienced much better battery performance likely due to the efficiency of the motor topology and controller.
I thought the Neo was significantly lighter than the CIM or Mini CIM, but the spreadsheet shows it heavier.
Am I missing something?
It’s an applied force by the motor, not the motor’s weight.