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:
Mar. 22, 1988
Filed:
Sep. 22, 1986
Manabu Shiraki, Kanagawa, JP;
Osami Miyao, Kanagawa, JP;
Shicoh Engineering Co., Ltd., Kanagawa, JP;
Abstract
A 1-phase coreless disk-type brushless motor or axial-flow brushless fan motor comprises a single position-detecting element located at a position on a printed circuit board corresponding to one of the magnetically active conductor portions of a stator coil or coils of the stator armature. A cogging-generating stator yoke having a cutaway portion of a specifically determined angular width is positioned relative to the stator coils, such that an end of the cutaway portion thereof is spaced by a distance equal to about one fourth of the pole width from another magnetically active conductor portion of the stator coils, so that the magnet rotor may stop at a position from which the motor can start itself. Various forms of such cogging generating stator yoke are disclosed, including a stator yoke which also serves as a circuit board.