I made a bipolar stepper motor driver with L298 and L297, it looks simmilar to this:
I tried it with a few motors and it worked fine.
Recently I bought a new motor: KP35FM2-035 1.8 DEG/STEP
It looks like this:
I used it on my motor driver and it behaves really strange.
Here's what is does:
1) No matter how much voltage I apply to the "power in" it is still weak, I can turn the motor shaft by hand very easily...
2) It does not move in one direction only, it turns erratically, I mean, the direction input to pin 17 of L297 is always constant, it should move only one direction, but it moves a few steps in one direction, then another direction, and so on... and if I "help it" (moving it with my hand), it moves in the direction I help it to move...
3) Even if the enable pin 10 of L297 is OFF it is still turning erratically, but it should not move at all !
4) Same as enable, if I reset pin 20 of L297 is ON, it is still turning erratically... it should not turn when it is reset !!
BUT... if I change to any other motor, it works fine, even if I don't turn the device off, and I swap the motors while the device is ON.
I have 4 of these motors, none of them work...
By the way.... all other motors (that work) the resistance on the coils have 12 ohms and less, but this motor has ~ 37 ohms.
Because of that I tried to change the resistors R8 & R9 to 1 ohm, 1.5 ohms, 10 ohms, 47 ohms, none of them work.... and I brought the voltage all the way to 26 volts, and I burned the L298 chip, but I have no idea how because the specs show it should take up to 50 volts thank god I bought extra ones...
Anyways...
Anyone knows how to get it to work ?
I tried it with a few motors and it worked fine.
Recently I bought a new motor: KP35FM2-035 1.8 DEG/STEP
It looks like this:
I used it on my motor driver and it behaves really strange.
Here's what is does:
1) No matter how much voltage I apply to the "power in" it is still weak, I can turn the motor shaft by hand very easily...
2) It does not move in one direction only, it turns erratically, I mean, the direction input to pin 17 of L297 is always constant, it should move only one direction, but it moves a few steps in one direction, then another direction, and so on... and if I "help it" (moving it with my hand), it moves in the direction I help it to move...
3) Even if the enable pin 10 of L297 is OFF it is still turning erratically, but it should not move at all !
4) Same as enable, if I reset pin 20 of L297 is ON, it is still turning erratically... it should not turn when it is reset !!
BUT... if I change to any other motor, it works fine, even if I don't turn the device off, and I swap the motors while the device is ON.
I have 4 of these motors, none of them work...
By the way.... all other motors (that work) the resistance on the coils have 12 ohms and less, but this motor has ~ 37 ohms.
Because of that I tried to change the resistors R8 & R9 to 1 ohm, 1.5 ohms, 10 ohms, 47 ohms, none of them work.... and I brought the voltage all the way to 26 volts, and I burned the L298 chip, but I have no idea how because the specs show it should take up to 50 volts thank god I bought extra ones...
Anyways...
Anyone knows how to get it to work ?
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