New Mamba software (beta) posted today

[BrianG]

I like the idea of torque control (although I still don't see how it could truly accomplish it without a current sensor), but after seeing people say the startup and low speed running is not as smooth, I think I'll wait...

[sikeston34m]

Originally Posted by BrianG

I like the idea of torque control (although I still don't see how it could truly accomplish it without a current sensor), but after seeing people say the startup and low speed running is not as smooth, I think I'll wait...

Torque Control without a current sensor?

This is where we get into how they are doing it. LOL

Could this be accomplished with a built-in lag time for motor rpm increase?

I'm picturing a X-Y Graph, where "ON" time FET switching is only allowed to increase as RPM increases.

How linear this is, is controlled by the torque setting.

Always before, As soon as emf stated the rotor was in position for the next phase, the next phase was switched on.

Picture, miliseconds worth of "lag time" being inserted here. The amount of the lag time, along with actual rpm increase, controlling the rate of FET switching increase.

Thoughts?

I have installed it on my MMP and have not noticed any change in startup or any cogging at all. reverse is working fine. I have NOT yet tried the new features and i am running sensored motors. so for what it's worth.. no issues on MMP with sensored motor.

[BrianG]

That does make sense though since the startup algorithm is completely different in sensored vs sensorless...

[brushlessboy16]

Originally Posted by BrianG

That does make sense though since the startup algorithm is completely different in sensored vs sensorless...

:LOL: i thought that too

I thought so too, and nobody had mentioned sensored motors.. so I did.

[SpEEdyBL]

Question:

Is the amount of torque control also based on throttle? So if you apply 50% vs. 100% throttle from a slow speed you get different amounts of torque instead of it being the same (assuming <50% throttle would normally trigger the torque control otherwise)
. If not, it's just a thought. Haven't actually tried the software yet.

[BrianG]

Originally Posted by SpEEdyBL

Question:

Is the amount of torque control also based on throttle? So if you apply 50% vs. 100% throttle from a slow speed you get different amounts of torque instead of it being the same (assuming <50% throttle would normally trigger the torque control otherwise)
. If not, it's just a thought. Haven't actually tried the software yet.

It would be really nice to know exactly how this torque control feature works behind the scenes. There are sooo many questions that could probably be answered by more people here if we knew the nuts and bolts of it...

[BrianG]

The lag time increase sounds a lot like how punch control works, except instead of integrating throttle input, they are making it a function of sensed rpm. Interesting.

[sikeston34m]

Originally Posted by BrianG

The lag time increase sounds a lot like how punch control works, except instead of integrating throttle input, they are making it a function of sensed rpm. Interesting.

Yes, but Punch Control simply works off a timer. Even the highest Punch Control setting still allows full throttle AND full Amp Draw.

The Torque Control Setting will influence Total Amp Draw and Acceleration all the way up to Top Speed.

Actually, I'm sure it's going to affect Top Speed since that is a result of total amp draw.

This really is a new twist to variable frequency FET switching.

Rather ground breaking if you ask me.

Way to Go Castle!

[Pdelcast]

Originally Posted by sikeston34m

Yes, but Punch Control simply works off a timer. Even the highest Punch Control setting still allows full throttle AND full Amp Draw.

The Torque Control Setting will influence Total Amp Draw and Acceleration all the way up to Top Speed.

Actually, I'm sure it's going to affect Top Speed since that is a result of total amp draw.

This really is a new twist to variable frequency FET switching.

Rather ground breaking if you ask me.

Way to Go Castle!

Well, torque control doesn't affect top speed at all. Unless you set the torque limit so low that the motor can't generate enough torque to get to top speed... But you would have to set a REALLY low torque setting for that to happen.

Try it -- you'll see. It's very effective at limiting torque, but doesn't limit top speed (at reasonable settings...)

Patrick

Not sure what is causing it but I noticed something strange when I tried torque control for the first time tonight. First let me give you my setup. Hyper10sc, neu 1509 1y, MMPro(Had to add a cap to rx to help with hesitation at take off), Futaba 3PM 2.4 Gig, 2s lipo 5000mah 30c.
What I noticed with the torque control set at 5 is that there is an inconsistent, almost stutter at randon times. I tested the truck in the street so I could see what was going on and it would sorta hesitate at random times. Almost like a gasoline engine that has a miss or contaminated fuel. This didn't happen everytime while acclerating, I would say 60% of the time. I didn't test it long but enough to notice the strange occurence. I will take it to the track on wednesday night and will be able to compare my lap times to previous weeks.
With torque control set at .2 top speed was maybe 3 mph and with it at 10 torque control seamed almost non existent. I tried this just to get a feel for how it works.
Alvin

[snellemin]

I found the same issue today in my son's hyper7. Intermittent stutter. I'm using 4s1p A123 with the MMPro and LRP 2500(2000kv under load). 0 timing and torque control set at 4.5.

[Pdelcast]

Originally Posted by snellemin

I found the same issue today in my son's hyper7. Intermittent stutter. I'm using 4s1p A123 with the MMPro and LRP 2500(2000kv under load). 0 timing and torque control set at 4.5.

We have noticed this too -- Richard is working to determine the cause.

He's also tweaking the startup -- torque control (when set to low values) can mess a bit with the startup.

We expect to have another release to address these issues in a week or two.

Thanx!

Patrick

You know what else would be great? If we could set a value where the toque contol would not functon past a certain rpm so it wouldn't work over, say, half throttle. This way it wouldn't affect top speed.