Stepper running irratically

Hi all,

I am having a little problem -

1. My Dual H Bridge controller running hot 

2. My Steeper motor runs fine for the first 60 seconds and then starts to run irratically.

I have attached a circurt diagram and would really appreciate any help.

Thanks in advance,

 

Mike

Attachment??

I don’t see the circuit diagram. How are you generating the pulse sequence? 

 

Specs

See if the controller can handle the current needed by the stepper motor. The more information you provide, the better the community can help. For example, provide links to the motor, controller and anything else you are using, as well as the code. It sounds like you might be requiring too much torque from the stepper compared to what it can handle.