Rotor sectional type flux switching motor and method for improving sine degree of back electromotive force thereof

The invention discloses a rotor sectional type flux switching motor and a method for improving the sine degree of back electromotive force thereof, belonging to the field of stator permanent-magnetic motors. The motor of the invention comprises salient pole stators, an armature winding, salient pole rotors and an electro-magnetic winding, wherein a permanent magnet is embedded in a gap between every two salient pole stators; the armature winding is wound on two salient pole stator arms connected with the permanent magnets; the electro-magnetic winding is wound on the permanent magnets in a vertical direction of the armature winding, and the excitation directions of adjacent permanent magnets are opposite; and the salient pole rotors are sectioned according to a space mechanical angle alpha along the axial direction. In the method of the invention, the back electromotive force generated by the salient pole stator A and the salient pole rotor A in the armature winding and the back electromotive force generated by the salient pole stator B and the salient pole rotor B in the armature winding have a phase difference of 180 degree electric angle, and correspondingly, the excitation directions of the permanent magnets embedded in salient pole stator teeth are opposite, so the back electromotive force of a synthesized unicoil has high sine degree and high amplitude value with the synthesized coefficient of 1.