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:
May. 10, 2011
Filed:
Mar. 11, 2009
Yosuke Yamada, Kyoto, JP;
Yosuke Yamada, Kyoto, JP;
Nidec Corporation, Kyoto, JP;
Abstract
In a rotor unit of a motor, field magnets are inserted into respective magnet holding holes of a rotor core. End plates are arranged on the upper and lower end surfaces of the rotor core to cover the magnets holding holes. Each of the end plates preferably has three bent portions extending perpendicular or substantially perpendicular to the radial direction, the three bent portions being arranged circumferentially. The bent portions are preferably formed through press working such that they are protruded toward the rotor core. The rotor core includes end plate fixing holes. End plates are preferably fixed to the rotor core by press-fitting the bent portions into the respective end plate fixing holes while allowing side surfaces of the bent portions to make contact with inner surfaces of the end plate fixing holes. Accordingly, the end plates can easily be fixed to the rotor core without increasing the axial size of the rotor unit.