PERMANENT-MAGNET INTERNAL ROTOR MOTOR

摘要

A permanent-magnet internal rotor motor comprising a stator assembly and an axle rotor (1) arranged internally. The stator assembly comprises a stator iron core (2) and a stator coil windingly arranged on the stator iron core (2). The stator iron core (2) has a large-and-small slot structure. The large-and-small slot structure comprises large slots (21) and small slots (22). The number of small slots (22) is identical to that of large slots (22). The small slots (22) are distributed correspondingly at the top of each tooth of the stator iron core (2). The ratio of the number of large slots (21) to the number of poles of the rotor (1) is the fraction used in a fractional slot design. The ratio of the number of large slots (21) to the number of poles of the rotor (1) satisfies the following formula: (2p±1)/3:2p, where p is the number of pairs of motor poles. The total number of slots of the stator iron core (2) is (2p±1)/3*2. The motor winding is of high coefficient and low harmonic content.