The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 17, 1999
Filed:
Jan. 24, 1996
Tsuyoshi Shiga, Nagoya, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A method of making a squirrel-cage rotor employs a forging die assembly including a receiving die receiving one end of a rotor core and having a first annular concavity corresponding to one of two end rings and a pressing die movable relative to the other end of the rotor core to form a second annular concavity corresponding to the other end ring. The one end of the rotor core is set in the receiving die, and a forging material such as aluminum is set at the other end of the rotor core. Subsequently, the pressing die is moved relative to the other end of the rotor core so that the forging material is pressurized to be plastically deformed. The forging material is caused to enter the first concavity through slots of the rotor core. Consequently, the first and second concavities and the slots of the rotor core are filled by the forging material such that a squirrel-cage conductor is formed.