What controller for 8S that has a true brake??

[starscream]

Originally Posted by Aragon

My Jazz 55-10-32 is still working great with my 8 pole Neu 1912. Brakes like a demon. :)

Do you have any issues with the throttle curve or start delay with the Jazz?

Originally Posted by starscream

Do you have any issues with the throttle curve or start delay with the Jazz?

No problems with those, but it does have this one oddity.

[starscream]

Originally Posted by Aragon

No problems with those, but it does have this one oddity.

The oddity described in the other thread sounds like proportional braking to me. Does it behave this way if you disable braking (setting the controller in forward only)?

Also, does the jazz 55-10-32 have a linear throttle curve in "car mode"? I've noticed that the HV110 and Sentinel both exhibit an "all or nothing" throttle behavior. In other words, the throttle on these airplane controllers seems to act as though my throttle exponential is set to +50%. So once I hit about 50% throttle, the truck accelerates like its WOT and is very hard to control on a small tight track.

[lutach]

My Jazz controllers are one, if not the smothest HV controller I have. It doesn't act like the airplane controller at all in car mode. The controller will respond to all your throttle commands. This videos I made were with the 40A version: http://www.youtube.com/watch?v=-yrzb2EYsug, http://www.youtube.com/watch?v=9330XxFGth0

[lutach]

Originally Posted by Aragon

My Jazz 55-10-32 is still working great with my 8 pole Neu 1912. Brakes like a demon. :)

The Jazz 55-10-32 is an awesome controller. I'm going to wait and see if the price will come down after the Jives come into play.

[jzemaxx]

Who carries the Jazz controllers? I went ahead and got the turnigy and it looks like its going to work. I now am needing a good controller that will handle up to 5S and 6S for a basher but it has to have brakes. My 9920's are great, but get really hot under racing /bashing conditions even with near stock gearing. I'm running it with a 7XL and 8XL on two basher emaxx's.

[BrianG]

The only thing I would add is that if you go with a HV setup, pick an ESC that will handle at least 2s more than you plan to run. The back-EMF from the motor braking at high voltage can get quite high and may exceed the FET and/or capacitor ratings. And if you plan to use lipos, be aware that these higher-voltage pulses could negatively affect them, but have no actual comparison data to support this - just common sense.

[lutach]

Originally Posted by BrianG

The only thing I would add is that if you go with a HV setup, pick an ESC that will handle at least 2s more than you plan to run. The back-EMF from the motor braking at high voltage can get quite high and may exceed the FET and/or capacitor ratings. And if you plan to use lipos, be aware that these higher-voltage pulses could negatively affect them, but have no actual comparison data to support this - just common sense.

With my DPR-150 I noticed some spikes when braking hard, but it never went above 1 volt.

[BrianG]

I wonder if the sampling rate is too slow? I noticed spikes bigger than that (up to 4v) with my Neu 1512/2d on 4s...

[lutach]

Originally Posted by BrianG

I wonder if the sampling rate is too slow? I noticed spikes bigger than that (up to 4v) with my Neu 1512/2d on 4s...

Do you think it might be bigger with a 6 pole motor? If so I can try something out with my truck that has the Mega.

[BrianG]

Might be something to look into. I know I was using an analog display (to capture those peaky spots), but maybe the inertia of the moving needle caused some overshoot? I know that my Fluke 87 didn't catch spikes that high, but figured it was the slow sampling rate...

[othello]

Same findings while braking using 10s1p A123, Jazz 55-10-32 and a Neu 1512/2Y in a 11lbs truggy.

Here is a graph of 3 accelerations and brakings.

The green curve shows motor RPM.

-> Voltage rose between 1-1.5V while braking
-> Amps spiked at below 20A while braking

[jzemaxx]

Hmm 20 amps while braking...I thought it would be more. Nice setup...

[lutach]

Most A spikes I've seen under hard braking was less then 3A.

[lutach]

Originally Posted by jzemaxx

Hmm 20 amps while braking...I thought it would be more. Nice setup...

Off topic real fast. jzemaxx, you signature show a Neu 1524, do I read that right?