Some Improvements of Starting Characteristics of Magnetic Gear by Eddy Current Effect

The proposed noncontact magnetic gearr baseds on permanent magnets has many performance characteristics which are effective for eliminating gear noise and vibration. Because a magnetic gear is an oil-free machine element, it is suitable for use in clean rooms and in vacuum. However, magnetic gears suffer from a tendency to slip under high-speed startup. In order to make practical use of magnetic gears possible, this paper deals with methods of high-speed startup enabling direct connection to a driving motor. It was found that a trial magnetic gear could be started at a high speed of 1500 rpm by utilizing an eddy current effect.