Rotor provided with a ring-shaped magnet
AssigneeDaido Tokushuko Kabushiki Kaisha
InventorsMakoto Saito, Yasuaki Kasai, Hiyoshi Yamada, Norio Yoshikawa
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Abstract
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.
Claims4
A rotor comprising a rotor body, a ring-shaped rare earth metal-iron type magnet arranged around the rotor body, and a low thermal-expansion material inserted between said rotor body and the magnet, wherein said rotor body has a thermal expansion coefficient of 8-25.times.10.sup.-6/ .degree.C., said magnet has a thermal expansion coefficient of not more than 3.times.10.sup.-6 /.degree.C., and said low thermal-expansion material has a thermal expansion coefficient of not more than 5.times.10.sup.-6 /.degree.C.
A rotor comprising a rotor body, a ring-shaped rare earth metal-iron type magnet arranged around the rotor body, and a low thermal-expansion material inserted between said rotor body and the magnet, wherein said rotor body has a thermal expansion coefficient of 10-20.times.10.sup.-6 /.degree.C., said magnet has a thermal- expansion coefficient of not more than 3.times.10.sup.-6 /.degree.C., and said low thermal-expansion material has a thermal expansion coefficient of not more than 5.times.10.sup.-6 /.degree.C.
Dependencies are inferred from the claim text.