Fixed cogging with MMM?

[dadgummit]

I also don't think you are being negative. My CRT.5 with 1509 1y, MM, 2s 5000MAH lipo never cogged at all..... Until I updated to the newest software. It is actually bad enough now that sometimes it needs a little push to take off from a complete stop... It is not more than a minor annoyance but I was thinking of e-mailing castle to ask how to go back to the older software.

[pb4ugo]

I saw the setup at RCX too. I just didn't think to ask them if they revised the software.DOH!

[Pdelcast]

The MMM was specifically designed with the Neu motors in mind, and starts the motors cog-free. While you can still force a tiny bit of cogging (I was running a MMM all day today with a 1515/1Y, and the only way I could get it to cog was to go full throttle from heavy reverse, then it would only cog when the battery was almost completely empty) there is practically no cogging with the MMM and a Neu type motor.

Patrick

[DRIFT_BUGGY]

Originally Posted by Pdelcast

The MMM was specifically designed with the Neu motors in mind, and starts the motors cog-free. While you can still force a tiny bit of cogging (I was running a MMM all day today with a 1515/1Y, and the only way I could get it to cog was to go full throttle from heavy reverse, then it would only cog when the battery was almost completely empty) there is practically no cogging with the MMM and a Neu type motor.

Patrick

Thanks for clearing that up Patrick

[Mister-T]

Something funny coming from rcgroup forum, by Mr Del castillo :)


That said, we are porting some of the Mamba code over to the Phoenix -- we worked on Mamba startup routines for several years -- the Mamba code has to start an enormous inertial load (heavy car!) with a motor that generates very little torque. This was a much much bigger problem than starting a prop, and we needed to do some things in a VERY different way than we did with the original Phoenix software. This is really an end-around for the problem -- rather than trying to tweak the older software, we are upgrading almost the entire start software routines. It's a large job to port this software, as the hardware on the Phoenix and Mamba is very different -- but we feel it will be the best solution long-term, as the Mamba software is much more intelligent about very low RPM motor state.


So I wonder if CM36 motor weren't torquy enought why didn't you go for some kind of outrunner ?

[Pdelcast]

Originally Posted by Mister-T

Something funny coming from rcgroup forum, by Mr Del castillo :)


That said, we are porting some of the Mamba code over to the Phoenix -- we worked on Mamba startup routines for several years -- the Mamba code has to start an enormous inertial load (heavy car!) with a motor that generates very little torque. This was a much much bigger problem than starting a prop, and we needed to do some things in a VERY different way than we did with the original Phoenix software. This is really an end-around for the problem -- rather than trying to tweak the older software, we are upgrading almost the entire start software routines. It's a large job to port this software, as the hardware on the Phoenix and Mamba is very different -- but we feel it will be the best solution long-term, as the Mamba software is much more intelligent about very low RPM motor state.


So I wonder if CM36 motor weren't torquy enought why didn't you go for some kind of outrunner ?

Mostly because outrunners have several drawbacks -- first of all they can't be well sealed, so dirt and junk will get in them quickly. Secondly, they have a very poor RPM/torque range -- yes, they have better torque than a two-pole slotless inrunner, but they have a poor range of torque by RPM. Where the slotless inrunner can run 50,000 or 60,000 RPM with no problem at all, still generating good torque.

Patrick

[pb4ugo]

Originally Posted by Pdelcast

The MMM was specifically designed with the Neu motors in mind, and starts the motors cog-free. While you can still force a tiny bit of cogging (I was running a MMM all day today with a 1515/1Y, and the only way I could get it to cog was to go full throttle from heavy reverse, then it would only cog when the battery was almost completely empty) there is practically no cogging with the MMM and a Neu type motor.

Patrick

Thank you for the info. Any further refinements coming for the MM to run a Neu as effectively?