The utility model discloses a reduce motor rotor core of magnetism short circuit, including structure towards piece and magnetic circuit towards piece, the structure is the fixed motor core that becomes of stack each other towards piece and a plurality of magnetic circuit towards the piece, the structure is opened towards piece and magnetic circuit towards piece center part has the central through hole, is close to the rotor border and opens and have magnet steel slot, the structure is towards each other UNICOM not of the adjacent magnet steel slot of piece, the magnetic circuit has one end UNICOM at least towards the adjacent magnet steel slot of piece. The utility model discloses simple structure, the effect is showing, can greatly reduce magnetism short circuit phenomenon, increases the magnetic field utilization ratio, improves the availability of material simultaneously, makes the size of the electric machine reduce, the weight loss, the energy consumption reduces.