超高速磁気ギヤの設計および試作試験

抄録

  In recent years, there has been strong demand for high-speed motors over 50,000 rpm has been strongly required to be reduced in size and weight and have an increased the output power density. Magnetic gears can change speed and torque without mechanical contact. Thus, they have low vibration, noise, wear, and friction heating. These features are desirable for high-speed applications. Flux-modulated type magnetic gears are expected to be put into practical use because they have a higher torque density than other kinds of magnetic gears. This paper describes the design of an ultra-high-speed magnetic gear whose maximum input speed is 80,000 rpm and presents the prototype test results. First, the dimensions of the magnetic gear are optimized by using two-dimensional finite element analysis (2D-FEM). Next, the optimized magnetic gear is evaluated by using 3D-FEM. The result of prototype tests shows that the maximum efficiency of the magnetic gear is 94.9% at low speed, and it is kept over 80% at 80,000 rpm.