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Super high speed electrical machines for electrical vehicles, compressors and co-generation systems have been studied. The speed range of the machines is 10, 000_??_30, 000 rpm. This paper describes a basic structure, analysis and characteristics of a newly developed super high speed machine, which rotates at 20, 000 rpm. The new machine is an axial-field type with a high energy permanent magnet (Nd-Fe-B). The stator has mold coils of air gap winding which can be divided in half. The rotor has two discs sandwiched by the mold coils. Many columnar magnets are embeded in the duralumin discs (non magnetic material) of the rotor. As the rotor is yokeless, the magnetic circuit of field is composed of back yokes of the stator and the permanent magnets of the rotor. This construction allows us to make the considerably light rotor which can withstand large centrifugal force at high speed. Then a little amature reaction, little cogging torque and small noise are realized. The analysis and test results show that the machine has the good stability at high speed and the capacity of about 7kW at 20, 000 rpm is achieved.

Structure and Characteristics of a High Speed Axial Gap Motor with Two Rotor Discs.