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:
Jul. 16, 1985
Filed:
Jul. 12, 1979
Mitsuo Uzuka, Saitama, JP;
Sony Corporation, Tokyo, JP;
Abstract
A brushless motor comprising a rotor assembly including a rotor magnet which is formed substantially as a hollow cylinder. In one embodiment, the rotor magnet is molded of synthetic resin and contains magnetic material. A rotor shaft is mechanically coupled to the rotor magnet. A stator assembly includes electromagnetic windings wound upon a core. The core has magnetic poles which are spaced from a surface of the cylindrical wall of the rotor magnet by an air gap. In one example, the rotor magnet is cup-shaped having an end wall which bridges the cylindrical wall so as to have the rotor shaft secured to such end wall. The stator assembly also may include a yoke member formed of magnetically permeable material and spaced from the opposite surface of the cylindrical wall of the rotor magnet, whereby the cylindrical wall of the rotor magnet rotates between the magnetic poles of the stator assembly and the yoke member.