Thread: Power supply help

Formula for voltage (from the Gecko site) is:

32 * √ inductance

for your example

32 * √ 2.5 = 50V

Unless the rules are different for the 203.

To get to the maximum voltage that the 203 can take (80V), the inductance of your motors need to be 6.25mh (Disclaimer: mathematics is not my strongest subject so check my results )

√ = square root

Thanks for the correction Geoff... i completely missed that!

hmm that makes it closer to my current power supply, maybe my issue is somewhere else?

Does seem odd i can't quite get the motors to go over 2500mm per mintue without them stalling
also the 203v's yellow indicator light which indicates maximum mechanical power does not light up, hence why i though the power supply was too small.. back to the drawing board!

i backed mine off because the motors were getting too hot , cant remember the "side" switch settings but dropped it 2 settings

if your motors are warm , yer up the juice , test on a heavy use of the axis for 30min
dont forget not to go over 3Amp with out heat sinks under your Gecko's , they dont like hot feet

my motors were at a stage where you couldnt hold them for 10seconds with out pain , ( too hot )

G201x's here , but i also dropped my mpm right down to 1600 , coz i hate missed steps , and was in a hurry at the time , i think it was the acceleration in jog causing the "trips", i should spend some time and tune this thing

Hi Lappy

More volts will increase the speed,but this also needs to be matched to the power that the drivers can take. If you are using the Vampire 203Vs then that is fine for this.

I got my toroids (2 of them) from here. This particular toroidal PSU supplies unregulated 80 volts, and also regulated 12v and 5v

What rate of acceleration are you using?

Originally Posted by Lappy

Thanks for the correction Geoff... i completely missed that!

hmm that makes it closer to my current power supply, maybe my issue is somewhere else?

Does seem odd i can't quite get the motors to go over 2500mm per mintue without them stalling
also the 203v's yellow indicator light which indicates maximum mechanical power does not light up, hence why i though the power supply was too small.. back to the drawing board!

Your power supply sounds ample.

2500mm/min. How many steps per mm?

Have you tried going to 35 or 45khz ?

Greg

Thanks Guys give me something to think about.

Greg - i haven't got it wired up at the moment as we just moved, i will need to check but i think it was 400 steps per mm (That's using 5 mm lead, 1 to 1 pulley ratio).

I'll set it all up in the next couple of days (just finishing off the new workshop) and double check though.

2500 mm per min ,.

with a 5mm per rev ball screw , we need a motor rev of 500 rpm , with 400 pulses per rev = 20,000 pulse per min

if your PC wont accept a pulse rate over that , drop it in a tank of non conductive vegetable oil , and over clock the crap out of it , to double the MHZ of the chip

the cooling properties of vegetable oil are great , but nouthin spinning can go in , no hard drives, fans , ect , but then how big the tank is ,is how long it can run for , a small tank will get hot real quick

veg oil is good , gets an old pentium4 too 4ghz , mount one in Freon , , a pain in #### , but dam , at -100c you could get 8ghz out of a pentium 4 ( cheep enough to destroy trying )

they have hit the line on how small the chips can be , and are now selling 2 core 4 core ?8core? ### , there software will only run on one core so who the hell needs "??8core??" chips , over cool them and run flat out is the next big leep, the"i" range is a load of crap , over clock a $300 "4core duo extream ", too 6Mhz , air cooled ther 3.8Mhz , >> they have reduced there speed in the the new" i "range , upped the cores , who needs cores ?, 4 is good

if you want too double the "juice " to your steppers , you need double the wire , volts packs speed , amps packs power ( with out time magnets dont work ) , i thought of water cooling on the stepper motors ( water jacket , spindle is ) , then double the amps , volts carnt go over the insulation properties of the enamel insulation used to wire the motor , amps carnt go past the thickness of the copper

so some one should , oil cool, there PC , and water cool there steppers , before i do
ive got 2 tesler 240core cards running at 1/2 a terra Bpm, TERRA is 1000 billion , CORES DONT MATCH SPEED


my 2C worth ken

Originally Posted by SawDustSniffer

ive got 2 tesler 240core cards running at 1/2 a terra Bpm
my 2C worth ken

We can't all afford to blow a months income (pensioners) on a video card though Ken. Must give brilliant results though, so long as your screens match the performance.