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. 27, 2003
Filed:
Feb. 27, 2001
Houng Joong Kim, Hitachi, JP;
Kohji Maki, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
With an electric motor formed according to a prior art, there is a relatively large amount of magnetic flux leaking between an armature and a secondary, resulting in a problem that an electric current is large but a desired output is small. In addition, since a magnetic attraction acts only in one direction between the armature and the secondary, there is a relatively large load on the support structures of the secondary, causing a distortion in the motor structure and some other disadvantages. In order to solve the above problems, the present invention provides an improved electric motor comprising an armature having a core formed by a magnetic material and having a coil wound around the core; and a secondary disposed within the armature with a clearance formed therebetween and supported to be relatively movable with respect to the armature.