stepper motor

[motorworks]

I have a stepper motor made by Sanyo Denki for IBM
Type 103-820-2, 4.5V dc, 1.4A
IBM p/n 2526734
6 wires 3/8" shaft 84mm square flange.
I am trying to find out the holding torque.
help!!
eddie

[Thrud]

Check with Sanyo-Denki for the specs or wire it up and test it.

[motorworks]

Thrud
Checked with sanyo,could not find the exact model,but close.
Please explain how to "wire it up and test"
Do you mean get it running and place some load on it until it starts to move?
thanks
eddie

[Rotate]

Many of these stepper motors have similar torque characteristics. This sounds like a Nema 34. Go to Oriental Motors and lookup stepper motor with similar dimensions. Remeber that this is a unipolar motor (6 wires), so it's holding torque will be lower than a bipolar motor (4wires) of the same size. Do NOT disassemble this motor in an effort to clean it or lub it. You'll lose significant amount of holding torque once it's been disassembled and reassembled.

What are you planning to use this motor for?

Albert


[This message has been edited by Rotate (edited 06-03-2003).]

[motorworks]

"Do NOT disassemble this motor in an effort to clean it or lub it. You'll lose significant amount of holding torque once it's been disassembled and reassembled."
Rotate
Now you tell me!!Got three for one dollar each.Two were seized on the bearings,so I took them apart,cleaned and replaced the bearings.Had a couple of small projects in mind but I wanted to know torque.Have I spoiled them?
eddie

[Rotate]

Well...this depends on the kind of permanent manget used, but generally speaking magnets loose their strength if their magnetic field is not coupled closely. This is why those old horseshoe magnets had to have the keeper, which is just a piece of iron.

If the motors were seized then you certainly didn't do any more harm by opening them up. I wouldn't worry too much. One of way getting a "feel" for the holding torque is to short all six wires and try to turn it with your fingers. Try this with the ones that you opened up and the one that you didn't. You'll get a feel for if any damage was done to the magnets.

You probably know this already, but note that althought the motor is designated 4.5V, you don't drive it with 4.5V. You'll need much more, unless you intend to run it at very low speed. Good luck.

Albert


[This message has been edited by Rotate (edited 06-03-2003).]

[ibewgypsie]

http://www.crankorgan.com/piker.htm check this guys toys out.. he had a banshee bipolar/unipolar board posted at one time made on perf board. It is gone now, but he has a pcb for sale..