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Electromagnetic design of a 1.12-MW, 18 000-r/min high-speed permanent-magnet motor (HSPMM) is carried out based on the analysis of pole number, stator slot number, rotor outer diameter, air-gap length, permanent magnet material, thickness, and pole arc. The no-load and full-load performance of the HSPMM is investigated in this paper by using 2-D finite element method (FEM). In addition, the power...
The high speed permanent magnet (PM) machine has been widely used in compressor, energy storage flywheel, and distributed power generation since it has high speed, small size, high efficiency and power density. The PM doubly fed reluctance machine is a combination structure of a reluctance rotor with stator having three-phase winding and PM, which has similar feature with reluctance. Taking the high...
Permanent magnet (PM) machine is especially being employed in high speed machines due to its simple structure and high power density. Nowadays, the sintered neodymium-iron-boron (Nd-Fe-B) material is used in most of PM machines. This kind of PM material has large compression strength but small tensile strength, and can not withstand the large centrifugal force due to the high rotation speed. A nonmagnetic...
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