Stepper motor runs at few step per revoluation

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bhadresh

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I am using ULN2003 to run Mitsumi M35SP-9 stepper motor salvage from old injket printer. The motor is 5 wire unipolar, with 24 V and 7.5 Deg step. so it's 48 steps per revolution.

The problem is than I operate it on 12 V instead of 24 V and instead of 48 step it rotates full turn at 12 steps. I havn't check it on 24 V. other 12 V stepper motors are working properly.

What is the problem ?

Regards.
 

Have you done the same commands on the motor's pins?

I had once the same problem like you have, but it came out that you can jump, i mean that you can do 2 steps by false commands.
 

No, I have to check it our.

Is there any problem If I run the motor at 12 V instead of 24 V. actrully motor is rated to 24 V.

I'll try our as you told here.

Thanks
 

bhadresh said:
No, I have to check it our.

Is there any problem If I run the motor at 12 V instead of 24 V. actrully motor is rated to 24 V.

I'll try our as you told here.

Thanks
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same prob i faced once. any current rating ??
try 24 volts...and check the number of steps...

another reason may be u supplied less amount current ....
 

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