Question Floppy motor issues

Yeah I'm unsure as of to why also, @Blame73 hasn't had the issue, This is my only reason for thinking the 25:1's just aren't up to task for this application, and or perhaps the drivers don't play nice with 25:1's either?

All three of my drivers/motors do the exact same thing, Surely all 3 drivers can't be dodgy? there not MM's lol
Might connect up an rc servo again and do another test to see if it does the same thing on square wave, can add weight to it also to try and back drive it

The reason i keep coming back to a "braking scenario" is i look at it kind of like my Rc rock crawler that i have in the sense of the brake part, if i alter the settings to turn off the drag brake the rc will be able to pushed along the floor forward or backwards, if i set it on 1 it will offer little resistance and if i set it on max it will lock up and drag the tires across the floor, (actually takes a fair bit of weight on it to make the motor spin) I just would of thought that it would be editable somehow in the main code for i guess how SMC3 utils make adjustements from the software side?

(For example) i see alot of people saying that PWMmin does nothing over a certain number in SMC3 utils, Surely this would be scalable or somewhat adjustable in the code to better relate to the numbers in SMC3 utils?

@Gadget999 Unfortunately i don't have any other drivers to try, Wouldn't this be editable/adjustable in the code somehow? PWM scaling or something?

I Can't set the clip limit to actually clip the square wave at all, Does mean the pot ratio is out? or am i miss interpreting what you mean?

Edit**

Also just been looking at motors and gearboxes and realized perhaps my motors are also too fast?

Motor Speed: 3600 RPM/160-180 RPM at Gearbox dependant on load

What would be the ideal combination to run?

This photo may help, I can't get the clip input or motor limits circled in blue to touch or even get really close to the blue square wave line circled in red

Hall effect Pots are:
6127V1A180L.5FS,

I'll have a crack at it this afternoon and let you know

Have reread your compact sim build and bought the 60:1 gearboxes that you have, I can couple my 200w motors to them which is good (same part number as yours) May have them by Friday, we shall see

So i was going to run the test with 20 and 120 but realized its actually way further away from the blue square wave line anyway?? in one of my videos i had them maxed and it was still no where near being able to clip anything? Photo below for reference

Any reason i can't close them up tighter? or any reason why the square wave isn't bigger?

I have used 25:1 / 30:1 / 40:1 and 60:1

the best performance in my opinion is 25:1 (provided you have enought motor power)

you can see a 25:1 6dof here -

I suspect your drivers are not moving the motors till the current gets up and then its overshooting. The problem may go away when you add some weight to the sim

Nice rig!!!

My sim is pretty well balanced has a pinch of front bias with me sitting in it

Like Noorbeast has said the fact it is doing it decoupled to the rig is the biggest concern

Cheers

Oki doki,

Can someone define what the "braking" is supposed to do? is this only something to do with input clipping?

How does it do this electrically?

did some testing with the motor disconnected from the gbox

if i hit the clip input it just cuts power on the board A and B direction led's, doesn't reverse direction or anything literally just cuts power until i manually move the arm back into range

After mucking about with the motor disconnected i thoroughly think these drivers are not capable of being used with 25:1's i think they do not have the ability to "brake" as such or something to that effect, Its the only thing that makes sense,

My reasoning behind this is a rig that is pretty well balanced will not sag with 50 or 60's with the power off and i bet if you unplug one whilst it is running with these 200w motors it will stop dead in its tracks!

Thoughts?

input clipping is about position not motor control - i think it prevents the motors moving to full range

my guess is your motor drivers have some protection when you change direction quickly to prevent the motors being driven in both directions at the same time and shorting out

it may be possible to increase / decrease the dead zone ?

I have built and designed an SMC6 program that has a small amount of downtime when the motors change direction to prevent this from happening (its not arduino compatible)

study the pwm signal as the motors change direction - if the motor driver is not allowing a sudden direction change the pwm will raise suddenly trying to get the motor back under control

Ok No worries, I will take a look at it while i wait for the new 60:1 gearboxes to arrive

Well got my hands on the 60:1's today, need to remake my levers and fit but threw one of the motors on and fired it up, moving the lever on the old box to control the rotation, These stop instantly so far, can't wait to get them mounted up!!!

UPDATE......

Floppy motor issue is resolved!! we have good motion!!

Now onto the issue of backlash masking and buying another 60:1 for the traction motor as this is also floppy it seems

Thank you everyone for your help and suggestions along the way!

Cheers