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. 17, 1987
Filed:
Oct. 30, 1986
Shicoh Engineering Co., Ltd., Yamato, JP;
Abstract
A single-phase brushless motor which can rotate smoothly with minimized torque ripples without generating a cogging torque. A magnet rotor of the motor has north and south magnetic pole and non-magnetized zones successively formed in ranges thereof each having an angular width of 120 degrees in electrical angle, and a stator armature is mounted in an opposing relationship to the magnet rotor and includes an annular stator yoke on which a same number of stator coils for each of 3 phases are wound in a troidal configuration and successively located in an angularly spaced relationship by an electrical angle of 120 degrees. A position detecting element is located for detecting a magnetic pole or non-magnetized portion of the magnet rotor, and in response to signals successively developed from the position detecting element during rotation of the magnet rotor, an energization controlling circuit successively energizes the stator coils to rotate the magnet rotor in a predetermined direction.