Recommendations for stepper motor debug / repair

[john swift]

its possible the motors OK and the stepper driver has failed and is only driving one of the 2 coils

a quick web search found a new motor at Newark.com for $378

http://www.newark.com/sanyo-denki-sa...ase/dp/20T1472

103H89222-5241 - Stepper Motor, SANMOTION F2, 1.8° per Step, Circular, Bipolar, 13.2 N-m, 6 A, Two Phase, 0.45 ohm


photos & details of the X axis stepper driver will be useful



whats the part number of the Y & Z stepper motors ?

Photo & details of the Y & Z stepper drives will be useful
to work out how the motors are being driven
6 wire unipolar or 4 bipolar with 2 wires not being connected

John

[cropwell]

its possible the motors OK and the stepper driver has failed and is only driving one of the 2 coils

Or a coil connection wire has broken.

[Cotswold Woody]

I've just broken open the controller box to see what type of driver I have & looks like I've got a blown fuse on the board. Hopefully this is the cause of my problem - if it is I think even I cn fix this one!

[AndyGuid]

But why did the fuse blow?

From what we read down-under, I think it may have summat to do with Brexit?

[Cotswold Woody]

Just replaced the fuse & fired her up - fuse blew again! The stepper controller is from a Canadian company called Larken automation.

[john swift]

the odds are one or more of the transistors in a H bridge has failed short circuit (NPN bipolar in old designs or FET's in later designs)

a shorted or broken cable would be high on my list of causes

John

[Cotswold Woody]

Hi John,
Apologies for my lack of knowledge, this is all new territory for me. I have just tried another fuse & the motor is now not making any noise or movement, the fuse is now no longer blowing. I am assuming that the short or break is most likely in the stepper motor itself, if so can I get it re-wound like a normal motor? If so does anyone know a company that can diagnose this & fix it?