アウターロータ型高速PMモータの高効率化に関する検討

抄録

  Many servers for communication base stations are being installed in order to develop information technology (IT). The servers require not only high-performance processer but also their cooling system. Among the cooling systems, a cooling fan is the most suitable due to good balance between performance and cost. This paper investigates efficiency improvement of an outer-rotor-type high-speed permanent magnet (PM) motor for the cooling-fan. From the viewpoint of rotor structure, three kinds of the PM motors, which are surface permanent magnet (SPM), interior permanent magnet (IPM), and inset permanent magnet (InPM), are designed and compared in terms of torque, eddy current loss, and efficiency by using three-dimensional finite element method (3D-FEM). The results reveal that the IPM motor with divided magnets in the circumference direction has the highest efficiency.