ROTOR WITH MAGNETIC POLES

摘要

A rotor 40 for an electrical machine comprises a pole 10 for creating a magnetic field for a stator 30 to interact with. The pole 10 is configured such that the magnetic field's magnitude decreases in increments 110, 120 in a circumferential direction from the middle of the pole 10 towards an edge 20 of the same. The decreasing magnetic field' s magnitude contributes to decreasing a cogging torque, and the incremental realization renders the pole manufacturing cheaper compared with poles 10 configured to have a continuously decreasing magnetic field's magnitude.