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:
Dec. 14, 2004
Filed:
Oct. 21, 2002
Motomichi Ohto, Kitakyushu, JP;
Masahiko Tanabe, Kitakyushu, JP;
Yasuhiro Miyamoto, Kitakyushu, JP;
Hirofumi Inokuchi, Kitakyushu, JP;
Kabushiki Kaisha Yaskawa Denki, Kitakyushu, JP;
Abstract
A permanent magnet synchronous linear motor comprising a field yoke ( ) having a plurality of permanent magnets ( ) the polarity of which is alternated and which are arranged linearly and an armature ( ) facing the array of the permanent magnets ( ) through a magnetic air gap, wherein the armature ( ) comprises an armature core ( ) having main teeth ( ) and slots ( ), an armature winding ( ) wound in the slots of the armature core ( ), and auxiliary teeth ( ) provided at both the ends of the armature core ( ). The distance &tgr; between the centers of the auxiliary teeth ( ) and the pitch &tgr; of the field poles satisfy a relation &tgr; =(2 −1)×&tgr; /2 (n is a positive integer) and the length O of the auxiliary teeth ( ) is in a relation of O<Hd<Ht where Hd is the length of the auxiliary teeth ( ) in the direction orthogonal to the array of permanent magnets and Ht is the length of the main teeth ( ) in the direction orthogonal to the array of permanent magnets. Thus a high performance permanent magnet synchronous linear motor having reduced cogging thrust can be provided.