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. 12, 2014
Filed:
May. 30, 2012
Kesatoshi Takeuchi, Shiojiri, JP;
Kazuyoshi Nakamura, Azumino, JP;
Kesatoshi Takeuchi, Shiojiri, JP;
Kazuyoshi Nakamura, Azumino, JP;
Seiko Epson Corporation, , JP;
Abstract
A coreless electric machine includes: a permanent magnet on a first member; N-phase (N≧2) air-core electromagnetic coils on a second member; and a coil back yoke on the second member, each electromagnetic coil including a conductor bundle in which a conductor is wound M times (M≧2), coil sub-aggregates are provided, each including the N electromagnetic coils of the respective N phases and in each of which a conductor bundle forming an effective coil area of a first-phase electromagnetic coil contacts a second conductor bundle forming an effective coil area of another phase electromagnetic coil, and the second conductor bundle is in an air-core portion of the first phase electromagnetic coil, and the coil sub-aggregates are arranged along the cylindrical area, in which the coil sub-aggregates do not overlap in a radiation direction of the cylindrical area, and adjacent coil sub-aggregates contact each other.