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:
Apr. 12, 1988
Filed:
Oct. 17, 1986
Osami Miyao, Kanagawa, JP;
Shicoh Engineering Co., Ltd., Kanagawa, JP;
Abstract
A cored single-phase brushless motor including a single position-detecting element can start itself without provision of a special cogging generating means. A field magnet as a rotor of the motor has alternate north and south magnetic pole zones, one of which has a width equal to an electrical angle of about 120 degrees while the other has a width equal to an electrical angle of about 240 degrees. A stator armature core has stator poles formed in a circumferentially equidistantly spaced relationship thereon and having a width equal to an electrical angle of about 120 degrees, and armature coils are wound on the stator poles. A position-detecting magnet rotor is formed on the field magnet, and a magnetic sensor detects a north, south magnetic pole or non-magnetized zone of the magnet rotor, to detect the position of the field magnet. An electric current successively energizes, in response to signals from the magnetic sensor, the armature coils for an electrical angle of 120 degrees to rotate the rotor.