MM & Team Orion Motor Cogging Issues

[Mike_D]

So i am using a Team Orion 17.5 sensored brushless motor on a MM and in my Stadium truck and i am having a lot of cogging issues. It just kind of stutters for a while when on the ground when trying to take off. What settings should i be using on the MM with a sensored motor?

[skellyo]

What's your overall gearing and what batteries are you using?

[Mike_D]

I am using a 87 tooth spur and 20 tooth pinion. I am also using some good SMC 4600mah nimh's. The truck is a Losi XXT MF2.

[brushlessboy16]

try increasing start power

[Takedown]

I also had this issue while running my sensored motors. Make a steep throttle curve from about 0%-25% and then make the rest of the 75% linear. This helped my issue alot and I barely noticed any cogging after that.

[BrianG]

It doesn't sound like a sensored motor issue per se, just that the kv is kinda low for the voltage being used. 17.5 turn is probably a low kv motor. It just sounds like the motor is not spinning fast enough at low speeds for the ESC to get a good rotor position reading.

Increasing the start power and twiddling with the throttle curve should help a lot if this is the case. You gotta get it spinning fairly fast right off the bat, then the ESC should be able to read positions fine.

[Mike_D]

Originally Posted by BrianG

It doesn't sound like a sensored motor issue per se, just that the kv is kinda low for the voltage being used. 17.5 turn is probably a low kv motor. It just sounds like the motor is not spinning fast enough at low speeds for the ESC to get a good rotor position reading.

Increasing the start power and twiddling with the throttle curve should help a lot if this is the case. You gotta get it spinning fairly fast right off the bat, then the ESC should be able to read positions fine.

That makes sense. I'll try those two things and let you guys know if they work.

[brushlessboy16]

Originally Posted by BrianG

It doesn't sound like a sensored motor issue per se, just that the kv is kinda low for the voltage being used. 17.5 turn is probably a low kv motor. It just sounds like the motor is not spinning fast enough at low speeds for the ESC to get a good rotor position reading.

Increasing the start power and twiddling with the throttle curve should help a lot if this is the case. You gotta get it spinning fairly fast right off the bat, then the ESC should be able to read positions fine.

we said that...

[Mike_D]

Originally Posted by brushlessboy16

we said that...

Sorry you both did say that too.

[BrianG]

I know, I was just repeating it.

BTW: Did you get the pinion yet?

[brushlessboy16]

yep :D

[Takedown]

Hey as long as hes clarifying it Im fine with people repeating things.

[Mike_D]

Well i set the start power on high and that helped a lot. I also played with the throttle curve but no matter what it did not seem to make much of a difference. It still cogs right when i pull the trigger but then after it's going no problems what so ever. Any other advice to get rid of the start cog? Besides buying a sensored ESC. I want to race this truck but that start cog is going to be an issue. If i do have to get a sensored ESC and recomendations?

[BrianG]

Normally I wouldn't suggest this, but what about a Tekno clutch adaptor? That will allow the motor to spool up a little before engaging the vehicle. Of course, you won't have motor braking with this setup...

[Mike_D]

It's only a 1/10th scale truck so i don't think that would work. Isn't the Tekno made for 5mm shafts?