Abstract
In order to improve the efficiency of a canned motor, it is important to reduce the fluid friction drag of the rotor. In this study, co-axial cylinders which were the model of a canned motor were examined. To reduce the fluid friction drag of the rotor, six kinds of rotor with riblet were used. The riblet height of rotors was from 0.05 to 0.4 mm and the riblet pitch of rotors was from 0.1 to 0.8 mm. The fluid friction drag of rotors was determined by the measured torque of rotors. The reduced ratio of the rotors with riblet to the rotor with smooth in the fluid friction drag was obtained in the range from 500 to 5000 of the gap Reynolds number Rew. The reduced ratio was also discussed for the rotor with triangular riblets like a screw.
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