Abstract: The embodiments of the present invention disclose a rotating electrical machine. The rotating electrical machine comprises a stator and a rotor; the rotor comprises a rotating shaft and magnetic poles fixed to the rotating shaft, a chamfer being provided on the radial outer surface of at least one of the magnetic poles; the stator comprises a stator core, the stator core being located on one side of the magnetic poles far from the rotating shaft, the chamfer overlapping with the stator core in the axial direction of the rotor.

Abstract: A nonreversible anti-backlash nut comprises a first nut body and a second nut which are provided with internal threads, and a shrinkage ring which is capable of shrinking inwards in a radial direction and is disposed between the first nut body and the second nut body. Nut body chamfers are separately arranged on sides, connected with the shrinkage ring, of the first nut body and the second nut body. A shrinkage ring chamfer is arranged at a position, corresponding to the nut body chamfers, of the shrinkage ring. After the nut is assembled, the shrinkage ring provides a shrinkage force to push, via the chamfers, the first nut body and the second nut body away from each other, so that an axial clearance of the nut is eliminated. Compared with the prior art, the nut has a better and more uniform clearance elimination effect.