The invention relates to the technical field of permanent
magnet synchronous motors, particularly to a
permanent magnet synchronous motor rotor
assembly for a vehicle, and a design method thereof anda motor. The
permanent magnet synchronous motor rotor
assembly for the vehicle comprises a rotor shaft, a rotor iron core attached magnetic steel
assembly and
magnetism isolating fixing end plates, wherein the rotor iron core attached magnetic steel assembly comprises a permanent
magnet, a rotor iron core and a counterweight pin, the rotor iron core is in key connection with the rotor shaft, a permanent
magnet groove and a weight removing hole are formed in the rotor iron core, the permanent magnet is inserted into the permanent magnet groove, the counterweight pin is inserted into the weightremoving hole, the
magnetism isolating fixing end plates are in key connection with the rotor shaft, and the two
magnetism isolating fixing end plates are arranged at the two ends of the rotor iron core attached magnetic steel assembly respectively. According to the
permanent magnet synchronous motor rotor assembly for the vehicle, the counterweight pin is arranged in the weight removing hole of the rotor core, so that a
dynamic balance plate can be omitted, the weight of the magnetism isolating fixing end plate can be reduced, the thickness of the magnetism isolating fixing end plate can be reduced, the
axial length of the rotor assembly can be shortened, and the weight and the cost of a product can be reduced.