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:
May. 19, 2009
Filed:
Oct. 25, 2006
Koki Hyodo, Aichi, JP;
Kenichi Ohta, Aichi, JP;
Koki Hyodo, Aichi, JP;
Kenichi Ohta, Aichi, JP;
Makita Corporation, Anjo-shi, JP;
Abstract
A stator, in which a rotor is rotatably accommodated, is provided with a cylindrical yoke and a magnet that is arranged so as to extend along an inner circumference of the yoke, and has a plurality of magnetic poles generating a magnetic field operable to rotate the rotor. A tip tool is coupled to the rotor and operable to perform a prescribed working in accordance with the rotation of the rotor. The yoke is includes a plurality of steel plates laminated together to form a cylindrical yoke. At least one of a groove and a rib is provided on at least one of the inner circumference of the yoke and an outer circumferential of the magnet so as to extend in an axial direction of the cylindrical yoke. The at least one of the groove and the rib is provided at a boundary between the magnetic poles.