Hello everyone,
i have connected my arduino uno to the stepper motor and my motor driver jkd2060ac, to the motor and arduino corectly. I want my motor to rotate 0.5 - 2 rpm and i have succeded that with potentiometer, but the problem is that my motor and my stepper driver heat to much. My question is, why it happens. Also i didnt menshioned that im suppling 24V/2A power to my stepper driver. Thanks everyone for help in advance.
Please post links to the stepper and the driver datasheet.
What current is set in the driver? Steppers always run rather hot, set up close to maximum parameters.
That tells nothing so far. Provide the documentation requested, then we know better. A link to the technical manual might be useful.
Step Motor NEMA 34 86x115, 6.0A, 8.7Nm sa duplom osovinom. Mehatron.rs - Komponente za CNC i automatizaciju ,this is the stepper motor and https://www.steppermotorcanada.ca/jk2060ac_manual.pdf , this is the driver. I set the current on the driver to 6.0A REF CURRENT, because thats acording to the stepper motor. Kelco - Detalji proizvoda - Adapter, 100-240VAC na 24VDC, 2000mA, konektor 2.1x5.5mm this link to the my power suply
Stepper motors and drivers run hot, That is just the way that it is. Whether too hot or not we need information provided by the motor and driver data sheets that should be provided with the schematic. If the motor performs without missing steps back off the current limit. Motor will run cooler and last longer.
Sorry but the links are to sales sites.
Okey but that's 3 times the capacity of the power supply. I'm surpriced the supply does not cut off totally.
Ok,that what i am asking. I dont know how to supply power to my stepper motor driver. In the datasheet it says ony that the suply voltage range from 20VAC to 60VAC and from 24VDC to 80VDC. There is nothning menshioned about the current. The driver is JKD2060AC
There will be a minimum value of current to operate your circuit, but there is no reason for a maximum value. A properly operating circuit will pull the current that it needs, no more.
Your post for the motor says current is 6A but does not say voltage or winding resistance, those numbers are needed to calculate power supply current / wattage.
There's a tiny specification image on the page OP linked to.
6Amp, 3volt (0.5 ohm coil resistance).
That works out to 6A * 3V * 1.414 = ~25 Watt (for two coils) at standstill (large motor == quite hot).
Motors like this should be mounted on a metal (aluminium) frame, for cooling.
A fully enclosed 24volt/2Amp supply seems the wrong choice.
A 24volt (or higher) 7Amp metal frame supply seems more suitable.
Leo..
WawaBrattain
13hpost #9
There's a tiny specification image on the page OP linked to.
6Amp, 3volt (0.5 ohm coil resistance).
WOW, how did you see that? I zoomed up to 400% ( Firefox) and only got a pale blur! Do you have a 72 inch monitor? 
I am sorry, but can you please explaine me once again, how did you calculate that i need 7A power suply? And one more question. Why should i use 24VDC, when the range in the datasheet is between 24 and 80VDC? Thank you
So one coil needs 18W, both coils need 36W. Add 100% for losses and mechanical work and you will end up with a power supply that can deliver 72W.
24V/3A should be fine. The higher the voltage, the lower the supplied current can be.
At least 24V and 6+A.
48V 10A is great,
72V 100A is ... big and expensive 
You can be found so often in topics about stepper motors that you should have learnt by now that you cannot simply transfer the coil current to the power supply unit. Things are not that easy.
Do you have a contract with power supply manufacturers? Slightly oversized may be ok, but you can also overdo it.
No profits unfortunately...
Actually I was answering to question "Why should i use 24VDC, when the range in the datasheet is between 24 and 80VDC? ", but I missed quotes.
Anyway, to purchase PSU in the middle of the voltage range and with certain current marginal is better than one at min/max limits. When you replace/upgrade your steppers, you have a good change to be able to reuse your PSU.
Of course if you already have one within these limits, you use that!
Click on the image, and it opens larger (also using FF).
The driver never powers both coils at 100%.
During (micro)stepping it usually varies between one at 100% and two at 70%.
See data sheets of drivers.
Motor+driver already need 24V/1.5A at standstill. Don't skimp on the supply if you want to run things cool. I wouldn't use anything below 5A. Same for the driver. A 6A driver for a 6A motor is going to be hot. Never run things at it's max. See if your motor performs at a lower current setting.
Leo..
DUH, TNX 
Nice You've noticed that.
I do have quite some experience of steppers, both as a prefessional, and as a hobbyist, buying, testing numerous of steppers. Okey, I use thumb rules, not rocket sciense depth of analyzis. So far no build has failed here.
@Wawa says the same...
Why taking the time to write? Underpowering project is a very common reason for failures, and You surely know it too. As all posts lacks more or less information my point of starting feels correct.
What's Your precise cure?
This is correct for the DRV8825/A4988 driver, where such tables are given for the currents. So in full step you will never get the set current (set current=100%).
But this cannot simply be applied to other drivers. A fully integrated driver (jkd2060ac) is used here. There is no such detailed table as in the DRV8825 data sheet. Only the effective and peak current is specified. E.g. if you set the current to 6A:
RMS=6A/Peak=7.2A
I assume that the conditions of the DRV8825 cannot be applied 1:1 here. To be save, I would go with 6A for each coil.