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:
Mar. 22, 2022
Filed:
Aug. 06, 2020
Minebea Mitsumi Inc., Nagano, JP;
Nobuyuki Sueyoshi, Kosai, JP;
Mitsuo Kinoshita, Hamamatsu, JP;
MINEBEA MITSUMI INC., Nagano, JP;
Abstract
A stepping motor has a relationship between an outer diameter of a rotor and an outer diameter of a bearing made of magnetic material that can be adjusted appropriately so as to impart magnetic attractive force to the bearing, the stepping motor including a rotormade of a permanent magnet, a stator including multiple pole teethandextending in an axial direction of the rotorarranged at an outer circumferential side of the rotor, a bearingrotatably supporting one end portion in the axial direction of the rotor, and a bearingrotatably supporting the other end portion in the axial direction of the rotor. Magnetic permeability of the bearingis greater than that of the bearing, the rotorincludes multiple magnetic poles on an outer circumferential surface along a circumferential direction of the rotor, and an outer diameter Dof the rotor, an outer diameter Dof a portion of the bearingwhich is facing the rotor, and a pitch P of the multiple magnetic poles of the rotorare set to satisfy the following relationship of formula 1()=<  (Formula 1).
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile