高比出力マイクロスターリングエンジンに関する研究

抄録

This paper describes new design methods of micro Stirling engines. By designing the phase angle of two engines at 90 degrees instead of 180 degrees, the engine, which we named TF 4 (Torque Flatting 4 cylinder) engine, generates continuous positive and smooth torque, so it does not need a flywheel to supplement negative torque. Although raising buffer pressure is effective to improve power of Stirling engine, it is difficult to apply mechanical seals for micro Stirling engines. Instead of mechanical seal, we suggest magnetic clutches that transmit engine torque noncontactly. Using magnetic clutches, it is possible to avoid rotary seal parts and decrease friction loss. Based on the proposed methods, we manufactured high specific power miniaturizing alpha type Stirling engines of 0.074 cc swept volume whose maximum frequency is 317 Hz. We also prove the performance of the engines and magnetic clutches.