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in my way of thinking, the so-called stepper "motor" is not really a motor at all--it is just a position-holding device. It makes it's highest torque when not moving, and makes little or no mechanical torque when moving. It will stall and skip steps when loaded or trying to "run" at high step rates. Put one on a dyno and try to test it under load. The older versions used magnitized stacks of iron laminations as rotor magnets, and if the rotor touched the stator during disassembly, it would be ruined.

Some older DC brush servo motors require the use of a "keeper" ring during disassembly. If the rotor is withdrawn from the stator without the keeper, then the magnet strength gets degraded severely every time it is done. This is determined by the type of material used to create the magnet, e.g. ferrite, alnico, samarium-cobalt, neodymium.

The Mote axial flux motors use PM on the rotor, which seemed to be of the neodymium variety and don't require the use of a keeper.

Post up a datasheet for the 3031 motor, maybe that will help understand the overheating issue.
 
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