H Bridge getting very hot

Using Arduino Motors, Mechanics, Power and CNC
#1

Hi

A have a setup with a steppermotor: JK42HS40-1304F and a dual H Bridge L298N 2Amp, and a arduino

The H bridge is connectet to 12v and there is common ground between the H bridge and the arduino uno.

I run the use the sketch from arduino : stepper_oneRevolution, but after only ie 30 sec the heat sink on the H bridge is getting very hot, so you cant touch it.

And the stepper startes to behave strange.

What is wrong? I dont think it the power supply it is at 16A, but does the H brigde need to manage more amps or ???

Regards

#2

Hi, welcome to the forum.

The L298N is an old driver, and after a little seaching I think everyone has a L298N that is getting hot with Nema 17 stepper motor.

Perhaps the EasyDriver is better : EasyDriver - Stepper Motor Driver - ROB-13226 - SparkFun Electronics
Or the Adafruit Motor Shield V2 : http://www.adafruit.com/product/1438
Or this one from Pololu : Pololu - A4988 Stepper Motor Driver Carriers

#3

Super thanks, I'll try the one from Pololu

#4

You are using a 12V power supply with a 4V motor.

1.3A x 3.2 ohm = 4.16V

The L298 is a simple non-switched H bridge. You are running -way- too much current. Are your steppers getting hot, too?

Use the chopper stepper driver boards from Pololu. Read the data - you are supposed to use a higher voltage power supply with it, but you are to set the current on a potentiometer on the PCB.

BTW, it helps if you provide links to nonstandard parts like stepper motors. When in doubt, provide a link to a datasheet or to the website page where you bought it.

#5

Hi again

I have now tryed the A4988 driver, and it works without it getting hot at all, so that's super.

I'm using this stepper : http://www.ebay.com/itm/231162408535?_trksid=p2059210.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

And I was under the impression it was a 12v stepper!!!

But I'm new to this so...

Regards

#6

You may get some useful info in stepper motor basics

...R

#7

Dalhoj:
Hi again

I have now tryed the A4988 driver, and it works without it getting hot at all, so that's super.

I'm using this stepper : http://www.ebay.com/itm/231162408535?_trksid=p2059210.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

And I was under the impression it was a 12v stepper!!!

But I'm new to this so...

Regards

Bipolar steppers are generaly rated by current and winding resistance, not
voltage, as they are current driven.

#8