Abstract :
In this paper, a superhigh-speed permanent-magnet generator (SHSPMG) which has an alloy sleeve on the rotor outer surface is investigated. The purpose of the sleeve is to fix the permanent magnets and protect them from being destroyed by the large centrifugal force. However, the sleeve material characteristics have much influence on the superhigh-speed machine, and therewith, most of rotor eddy-current losses are generated in the alloy rotor sleeve, which could increase the device temperature. Taking a 117-kW 60 000-r/min SHSPMG as an example, the influence of the sleeve on the generator output performance is analyzed when the generator sleeve is made of stainless steel, carbon fiber, copper-iron alloy, and copper. In addition, the eddy-current loss distributions could be gotten, and therewith, the variations of the eddy-current losses in different kinds of sleeves are analyzed. Based on the 3-D coupling field between the fluid and temperature, the temperature distributions were obtained when the sleeve adopts different materials. Moreover, the temperature variations of the permanent magnets are further analyzed. The obtained conclusions may provide some references for the design and analyses of the SHSPMG.
Keywords :
carbon fibres; copper; copper alloys; eddy current losses; electromagnetic coupling; iron alloys; permanent magnet generators; permanent magnets; stainless steel; temperature distribution; 3D coupling field; C; Cu; CuFe; SHSPMG; alloy rotor sleeve material; carbon fiber; centrifugal force; copper-iron alloy; electromagnetic field analysis; power 117 kW; rotor eddy-current loss distribution; rotor outer surface; stainless steel; superhigh-speed machine; superhigh-speed permanent-magnet generator; temperature distribution; temperature field analysis; Carbon; Copper; Eddy currents; Generators; Materials; Permanent magnets; Rotors; Eddy-current losses; electromagnetic field; rotor sleeve; superhigh-speed permanent-magnet generator (SHSPMG); temperature field;
