This chapter introduces two methods for improving output torque while reducing rotor mass. The novel concentrated-flux-type PM machine with irregular magnets and iron poles (CPMIP) is considered as a topologyTopology structure that can effectively achieve this goal. The configuration has following advantages. First, the employment of quasi-trapezoid magnets with opposite magnetization direction and large cross-section helps to enhance the flux-focusing effect and thus the torque generation. Second, the quasi-triangular iron poles can improve the magnetic self-shielding effect well, and thus the rotor yoke can be removed completely and the rotor mass could be reduced significantly. Third, due to the reduction of PM volume and the improvement of torque output, the PM utilization ratio of electrical machineElectrical machines can be increased greatly. On the other hand, the working principles of linear machines and rotaryRotary machines are the same, so consistent conclusions that can be extended to the field of rotaryRotary machine design can be obtained by studying certain linear machines. The novel compound HalbachHalbach array consisting of the outer layer of quasi-HalbachHalbach array and inner layer of axial magnetized pattern is considered an good candidate for reducing rotor mass while improving output performance. This magnetic pattern can completely removed the high-density back iron existed in conventional linear PM machines due to the much improvement of self-shielding effect. Thus, the mover mass can be greatly reduced and hence high dynamic performance can be obtain.