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:
Aug. 25, 2020
Filed:
Jun. 01, 2018
Mabuchi Motor Co., Ltd., Chiba, JP;
Shigeru Yamamoto, Chiba, JP;
MABUCHI MOTOR CO., LTD., Chiba, JP;
Abstract
A resolver includes a resolver rotor fixed to a rotating shaft, and a resolver stator disposed around the resolver rotor. The resolver stator includes an annular stator core having a plurality of salient poles which protrudes radially inward and which is disposed at regular intervals in a circumferential direction. The resolver rotor has an outer peripheral surface defined by an outer radius Rm(φ) which is obtained by blending, with respect to a first function Gp(φ) where an air gap between the resolver rotor and the salient poles is proportional to a sine wave (sin φ) related to an angle φ of the resolver rotor, a second function Gip(φ) where the inverse of the air gap is proportional to the sine wave (sin φ), at a predetermined ratio α.