Permanent magnet synchronous motor, electric vehicle and power upgrading method of permanent magnet synchronous motor

The invention discloses a permanent magnet synchronous motor, an electric vehicle and a power upgrading method of the permanent magnet synchronous motor. The permanent magnet synchronous motor comprises a stator (1) and a rotor (2) accommodated in the stator (1) and coaxial with the stator (1). The rotor (2) comprises a rotor rotating shaft (21) coaxial with the stator (1) and a first rotor iron core (22) arranged on the rotor rotating shaft (21), and the axial length of the stator (1) is greater than the axial length of the first rotor iron core (22). A rotor iron core space is reserved so that after a vehicle is sold, the power of the motor can be improved by adding the rotor iron core, the motor does not need to be integrally replaced, and the cost for improving the power of the vehicleis greatly reduced. 本申请公开一种永磁同步电机、电动汽车、及永磁同步电机的功率升级方法。永磁同步电机，包括：定子(1)、以及容置在所述定子(1)内与所述定子(1)同轴的转子(2)，所述转子(2)包括与所述定子(1)同轴的转子转轴(21)、以及套设在所述转子转轴(21)上的第一转子铁芯(22)，所述定子(1)的轴向长度大于所述第一转子铁芯(22)的轴向长度。本申请预留转子铁芯空间，使得在车辆出售后，能够通过增加转子铁芯以提升电