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:
Jan. 29, 2019
Filed:
Apr. 22, 2016
Makita Corporation, Anjo-Shi, JP;
Kei Kouda, Anjo, JP;
Akira Niwa, Anjo, JP;
MAKITA CORPORATION, Anjo-Shi, JP;
Abstract
A power tool, such as a hammer driver-drill (), includes a brushless motor () having a stator () and a rotor (). The stator () has slots () between teeth () that protrude inwardly. Coils () are respectively wound around each tooth () and the coils () of all phases are delta-connected in series. The rotor () includes permanent magnets () and is rotatably disposed in the interior of the stator (). A sensor circuit board () is fixed to the stator () and includes magnetic sensors () that detect the rotational position of the rotor (). The magnetic sensors () are provided at locations that correspond at least substantially to the centers of the slots () in the rotational direction of the rotor ().