The permanent magnet motor for new energy automobile was introduced. The quadraturedirect axis inductance, electromagnetic torque and magnetic resistance torque properties were analyzed by finite element method for four kinds of motors with different rotor structures: “V” type, “V—” type, doublearc type, and “U—” type. The flux weakening capability and the factors influencing flux weakening capability were analyzed, and the efficiency maps of different rotor structures were given by simulation. By comparing and analyzing the characteristics of different rotor structures, it was concluded that different rotor magnetic circuit structures were suitable for different new energy automobile applications.