Dear friends
I had made a stepper motor full step drive which was started jamming after 3 month of run.
after jamming when i apply mechanical force to shaft by plier it releases and starts working fine but after 3-4 run this problem repeats.
Thanks for reply.
Dear Friends but I dont think this case is for Bad bearings I have tried Spray WD40 But problem is there.
I searched on google, and found a line "Mid range resonance " what is this mean ?
Resonance has nothing to do with a shaft that has to be loosened with a pliers. What you describe sounds like a mechanical binding problem. Does the problem still occur if you disconnect the shaft from the load?
BUT if the problem is a mis-matched load, you could see a situation where you lose steps and the motor stops moving because it can't develop the required torque at high speed.
Thanks to all of you. For now i have solved the problem by changing motor and now it is working.
If the problem comes again in new motor then i will come for discussion about this topic.
Thanks to all of you. For now i have solved the problem by changing motor and now it is working.
If the problem comes again in new motor then i will come for discussion about this topic.
I had made the drive using two H bridge, using bipolar stepper motors, My job was to drive motor less than 1 rpm, I did it but the motor was taking too much current. So i started choping supply of motor at 458 hz and controlled current by varing duty cycle i got good torque with speed customer required.
After 3 month this problem comes I feel that it was something magnetic jam and I replaced motor.
What you think?
YOu probably had a sleeve bearing. Any warp in the shaft from an excess radial load might cause this. Any warp might cause the rotor magnets to scrape the stator.
I had made the drive using two H bridge, using bipolar stepper motors, My job was to drive motor less than 1 rpm, I did it but the motor was taking too much current. So i started choping supply of motor at 458 hz and controlled current by varing duty cycle i got good torque with speed customer required.
After 3 month this problem comes I feel that it was something magnetic jam and I replaced motor.
What you think?
I had not run it more than 10 minute in my complete test.
Motor specification was 3 ampere 18.9 kg/cm.
I run it 4 amp to 5 amp but for test purpose not more than 30 second at a time.
So for this reason can I think My motor was damaged while my testing time.
It's possible that the excessive current could have partially demagnetized the permanent magnets, but it's hard to say. But I think the fact that it ran for 3 months indicates it's probably a mechanical issue.
I agree with you "partially demagnetized the permanent magnets" can be the reason for motor damage.
But for now i have replaced it, and till now it is working, If problem comes again then I have to come into deep water.
Thank you barry for sharing this much information.