stepper motor control

[muhendis]

Hi there..
I have pic16f877 and a power circuit which uses L298.With these 2 I was able to run a small stepper motor.But with other (about 10 motors) motors I couldnt success.I tried all possible pulse sequence and some of them had only shaking/vibrating and some of them didnt move at all.My questions :

May this be due the fact that my power circuit does not have L297 ?
L298 gets hot very fast,is it normal? (even when the motor shaft is free to turn,no load)
I used this sequence (with all possible combinations,total 24 combinations ) :
1000
0100
0010
0001
But this type of sequence seems to work only for my small stepper motor.For other motors (not too big,only about 1-1.5 amperes) it didnt work.Can you suggest any other sequence?Or any other suggestion?

(L298 is said to work up to 3A,all motors I tried are about 1-1.5 A,no load at all)

Thanks for your future answers..This is very important for me,I hope someone can answer it.

 

[stephen87]

First of all be sure that the stepper is either bipolar or unipolar stepper motor, because the driving circuit is different.

**broken link removed**

 

[ronv]

What voltage? What step rate?