Hinged stator core

1. A hinged stator core, characterized in that the hinged stator core comprises a plurality of individual iron cores each comprising teeth on an inner side and a yoke on an outer side; two adjacent individual iron cores are connected by a hinge structure comprising a hinge and a hinge slot fitted with the hinge, with both the hinge and the hinge slot being arranged on the yoke of the individual iron core; the hinge and the hinge slot are arranged on a side, which rotates about a rotor shaft clockwise and/or on a side, which rotates about a rotor shaft counterclockwise, of the yoke of the individual iron core; the hinge consists of a fitting segment fitted with the hinge slot and a connecting segment for connecting the fitting segment with the yoke; the fitting segment has a circular or segmental shape along a radial cross-section of the rotor shaft; an outside edge of the connecting segment looks like a sloped structure which runs from the yoke side to the fitting segment side and extends inward, an inside edge of the connecting segment looks like a sloped structure which runs from the yoke side to the fitting segment side and extends inward, and the inside edge of the connecting segment is entirely located outside endpoints of the fitting segment; a notch, which gives the way to the connecting segment of the hinge, is formed at an end of an outer edge of a side, which rotates along the rotor shaft, of the yoke; an opening of the hinge slot is communicated with the notch; the hinge slot has an arced shape along the radial cross-section of the rotor shaft, with an arc angle of above 180°; both a center of a circle of the fitting segment of the hinge and a center of a circle of the hinge slot are in the circumference of a circle taking a center of the stator core as its center; the opening of the hinge slot has a width less than a diameter of the fitting segment of the hinge; the yoke comprises an external yoke segment and an internal yoke segment; the notch, the hinge slot and the hinge are all located on the external yoke segment, and the internal yoke segment looks like a trapezoidal structure which is narrow inside and wide outside; all the individual iron cores are connected to form the stator core, so that sides of the trapezoidal structures of the internal yoke segments of two adjacent individual iron cores are pressed against each other, an inner edge of the connecting segment of the hinge is pressed against an outer edge of the internal yoke segment, and the outer edge of the internal yoke segment is in smooth connection to the opening of the hinge slot;

wherein one of the hinge and the hinge slot is arranged on a side, which rotates about the rotor shaft clockwise, of the yoke of the individual iron core, and the other one of the hinge and the hinge slot is arranged on a side, which rotates about the rotor shaft counterclockwise, of the yoke of the individual iron core;

wherein the individual iron cores of the stator core have a same structure, size and shape;

wherein a centerline of an included angle formed by two sides of the trapezoidal structure of the internal yoke segment is on a diameter line of the stator core;

wherein the center of the external yoke segment is recessed inward to form a positioning groove, and the positioning groove looks like a trapezoidal structure which is wide inside and narrow outside;

wherein an inner rim of the internal yoke segment is arranged linearly and is in smooth connection to the teeth;

wherein the individual iron core has a plurality of through slots which axially runs through the individual iron core along the rotor shaft, and the through slots are elongated; and the individual iron core comprises a plurality of first slots and a plurality of second slots; there is an included angle between one of the first slots and one of the second slots; the first slots are arranged symmetrically about the second slots; and the first slots are located on the yoke;

wherein there are two first slots and two second slots, the second slots are located on a symmetric line of the teeth, and the first slots and the second slots are vertical to each other;

wherein an inner rim of the hinge of the individual iron core has a same shape as an outer rim of the internal yoke segment of an adjacent individual iron core and an inner rim of the hinge slot, the hinge is fitted with the hinge slot so that the inner edge of the hinge of one individual iron core is tightly and seamlessly connected to the outer edge of the internal yoke segment of an adjacent individual iron core; and

wherein gaps are formed between the teeth of the individual iron cores of the stator core.