JITTERY CAR

[extrememacko]

Hello, Im new to the modern electrics but I have mixed old with new;

I am running 27 turn brushed stock motors with nosram dominator evolution esc and modern 2s lipo in a buggy. My buggy works fine on the bench but as soon as i try to drive it away it just jitters about and doesnt respond properly to signals.

I have 3 escs, 2 radio sets, 2 lipos and 3 stock motors, I have tried all combinations of these to see which part is faulty but it makes no difference!

Is there some incompatability with lipos and old style brushed escs?

The only combination that works is when i try a Keyence speedo but even then when the car goes further than 20 metres it sometimes disobeys the tx. The nosram and lrp qc3 are jitterers and cause the motors to get very hot and start smoking almost straight away!

Please help!

[Danny Harrison]

I believe there is specific esc setting for brushed and brushless motors. I'd try that first.

[johnnygibbon]

1. embrace the modern age of rc
2. throw the brushed motors in the bin
3. buy a brushless motor
4. buy 2.4ghz radio gear
5. rejoice in the reliabillity and general happiness of modern day electrics

hope this helped , it did for me

[extrememacko]

thanks, throw in the bin eh, mmm ill think about that.

Settings found on the keyence, no mention on the others manuals.

Would be interesting to know why they need a special setting, Whats the difference between dc power from a nimh and dc power from a lipo?

[Cardnim]

Originally Posted by extrememacko

Would be interesting to know why they need a special setting, Whats the difference between dc power from a nimh and dc power from a lipo?

I dont believe there is any difference in the batteries, but if you are running a brushed motor from brushless esc then thats the problem.

Brushed motors send current into the brushes, then into the commutator which causes a magnetic field, and this is then pushed round by the permanent magnets in the can of the motor.

A brushless motor is completely different.
The current from the battery (via esc) goes to three different electromagnets which have to be fired in an exact sequence in order to create the rotation. (A,B,C)

It is this sequence which is causing your jittery-ness I believe.

Your esc thinks it is needing to pulse the current to different parts of your motor because it thinks it is driving a brushless motor... when actually, it should just be sending a constant variable current to control the rotational speed of a brushed motor.

Just a guess, but hope it helps.

[extrememacko]

Thats interesting but my issue is the opositte, I am running a brushed motor with a brushed speed controller.