A dc brushed motor with a commutator, the stator isnt fixed to anything and is left freely on a desk for example, now apllying power the rotor starts to turn, if I take the rotor and hold it with hand the stator now starts to turn around , I assume this happens because the stator poles and rotor poles push against each other and if one is stationary the other is left to move the one with less resisatnce to movement will move, but it can be either one since the magnetic field doesnt care which one it is correct? Now further what I want to know is what would happen if i took the rotor and fixed it permanently as it is against the stator , say for example welded the rotor shaft to stator at some point , now the stator makes up the magnetic field N-S or S-N as usual and the rotor poles tend to repel against that field also as usual but what would the result be ? say I put the whole assembly of stator and rotor into some extended bearings , would the whole motor (stator and rotor together ) now rotate around some external axis like one piece ? This is were I get lost because as long as the current runs through the rotor wires the rotor poles being locked with respect to the stator poles would try to constantly repel but since the stator is fixed with the rotor as one piece the only frame of reference to repel against not is the rotor shaft which is attached into some external bearings , the question being would it spin or what else would it do if not that? thanks.