The invention provides a hard mini rotating electrical machine, comprising a rotor which can convert output characteristic but not increase mechanical loss and also not consume electricity which doesn't contribute to increase torque. The rotor has N pole magnet and S pole magnet which is fixed arranged alternately. Among a plurality of first teeth on a first stator cores, every end surface which is opposite to the rotor is wider than relative surface and a winding wounds around part of the two end surfaces. A second stator cores has second teeth whose amount is the same with the first teeth and which has no winding. The second teeth is arranged to be opposite to narrower end surface of every first tooth and every second tooth can move between reference position of which the second tooth are direct to every first tooth and maximum mobile position which is in the midst of among every narrower end surface. In the reference position, an intense flux-flow flows from every magnet into the whole first teeth. In the maximum mobile position, a feeble flux-flow only flows through the upward side of wider end surface of every first tooth. In the middle mobile position, a moderate amount flux-flow is produced.