Sughrue, Mion, Zinn, Macpeak & Seas
Rotor provided with a ring-shaped magnet
 A rotor comprises a rotor body and a ring-shaped rare earth metal-iron type magnet arranged therearound, in which a low thermal-expansion material is inserted between the rotor body and the magnet. 
Daido Tokushuko Kabushiki Kaisha
H
H02K
inventional
Norio Hiyoshi Makoto Yasuaki
Yoshikawa Yamada Saito Kasai