Question 6 DOF 350W motors with IBT-2 43A H-bridge

Hello,

i have designed 6 DOF with the following specs

- 6x 12V 350W motors

- 6x IBT-2 43A H-bridge
- 6x PSU 12V 50A

the set up is


the difference each motor have its own PSU

my problem when i use the rig with SIMtools for racing some axis shuts down, when i get back to the SMC interface the motors works again.
i tried to test and put some pressure on each motor while testing a sin signal it shuts down and the feedback signal goes on straight line.


i installed no capacitors or diods or any thing else. direct connection from the PSU to the IBT-2 bridge and from the bridge to the motor.
some motors are still working fine when i race and some shut down. i think those motors are powerful to handle the weight with the 50A PSU.
im thinking of using gas struts to help the pressure but i prefer not using the gas struts and check if the setup can be modified to handle the weight.
any help??
regards.

my CTC is 8cm.
my PSU



since the motors draw 35A i got the 50A PSU. i dont know what is the problem do i need to put battery or capacitors to eliminate the motor reverse power and if i need to can some one please draw a diagram for it or post picture..
i will try to install gas struts now to see if it works.

hi @noorbeast
i used a battery to chack if the shut down from the PSU but it is not the same shut down happen with battery. when the motor stall it shuts down.
now i dont know if the shut down from the motor or the IBT-2 H bridge. is there a way to find out. note when the motor shut down i close SMC and reopen it again the motor work again...
can you help on this
regards.

is it possible the problem is the IBT-2 is overheating ?

somebody has wired 2 of them together to double the current

the ibt-2 can be wired up with leds to show you if it has overload or over-temperature problems

is it all the motors or just one motor that has the problem ?

thank you @Gadget999
its not overheating when it shuts down i touch the board its worm but not too much hot. i will try the double bridge....
all motors have same issue and shuts down . defiantly the problem from the IBT. cause i used a battery instead the PSU same problem. i think the problem from overloading the IBT2

tha

thanx @noorbeast

i have lowered the game % your right the motors take longer time but also it shuts off after 30 sec.... i think the problem from the IBT2. cause i used a battery the same thing happens. i will try double the IBT and see if it works or get a better H-Bridge more expensive but i think better than those cheap IBT2.

the problem was from the IBT2 overloads and cut off
when i double them it works perfect and has no problems for 5 min with full load testing it was ok. i will order more of them.
@Gadget999 i will look for wiring the led it better to know what it going on... if you have link for led wiring kindly post it.

thank you all cheers

doubling up the ibt-2 is a really simple trick !

pins 5 and 6 can be connected to an led -- http://www.hessmer.org/blog/2013/12/28/ibt-2-h-bridge-with-arduino/

there are 2 mosfets on each board

details here - http://www.robotpower.com/downloads/BTS7960_v1.1_2004-12-07.pdf

I know I may be biased a little but I tried IBT2's on my rig a long time ago and they were just not up to the job, shut down and overheating plus making the motors make a lot of noise. They probably okay for a 2DOF however they are not even close to Sabertooths which is what I would advise anyone to use on a 6DOF.

@SilentChill i agree sabertooth are better than IBT2 but too expensive. BTW i like your 6 DOF and my rig design so close to your design....
i will try to double IBT first since they are cheap and maybe get the 60A sabertooth in next stage....
thanx for the info... i was going to buy the MMS like yours but what i read from your post they are most faulty.... so i got the IBT instead.

thank you @Gadget999

i need to clean things up. so i removed all components beneath the seat and install them on a rack box.

the rack with PSU installed.


power connections


the electronics mounted on r rack shelf.
i am waiting for the extra IBT, rectifier, relayes and some fuses and stuff i ordered. once i get them i will post more pix and info. the only thing concerns me is the cable length to the motors.... will it make any problems???? the cable is 5mm and 2m to 3m length .... any suggestion?
regards.

Pourquoi tant d'Arduino? 3 pour 6DOF? Nice setup

2 is enough to drive 6 motors, but i just add 1 more

painted the rig black


pots setup



PSU & battery




andiuno & IBT. im short in 6 IBT so im waiting for the shipment to arrive.


second shelf fuses and the white boxes will include the capacitors and rectifiers.


cheers.

Le dernier arduino sert a quoi alors? il ne Control rien??

[QUOTE = "Mick29, post: 150388, member: 28810"] The last arduino serves what then? he does not Control anything [/ QUOTE]

each arduino controls 2 motors. and each motor have 2x IBT-2 motor drive. i am still waiting for the IBT-2 i ordered to fit them in the model.