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:
Nov. 05, 2002
Filed:
Sep. 21, 2000
Yasuhiro Miyamoto, Fukuoka, JP;
Kazuhiro Maekawa, Fukuoka, JP;
Takato Doi, Fukuoka, JP;
Masaki Hisatsune, Fukuoka, JP;
Kabushiki Kaisha Yaskawa Denki, Kitakyushu, JP;
Abstract
A moving-coil linear motor free of cogging. The motor has a rotor ( ) including separated block cores ( and ), each of which has a length equivalent to eight times the magnet pitch (Pm) and includes nine teeth ( ) along the length. The block cores are arranged in line and separated by gaps equivalent to ⅔ of the magnet pitch. The first block ( ) is divided into three groups of teeth ( ) with armature coils ( ) to form U-, V- and W-phases. Similarly, the second block ( ) is grouped to form V-, W- and U-phases, and the third block ( ) is grouped to form W-, U- and V-phases. The armature coils ( ) are formed to differ in phase by 120 degrees from one another in order to zero the sum of the cogging caused by the blocks.