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. 01, 2017
Filed:
Mar. 31, 2014
Nidec Sankyo Corporation, Nagano, JP;
Toshio Yamamoto, Nagano, JP;
NIDEC SANKYO CORPORATION, Nagano, JP;
Abstract
A stepping motor may include a rotor having a rotation shaft and a permanent magnet, a fixed body having a cylindrical stator provided with a plurality of pole teeth so as to face the permanent magnet, an urging member which urges the rotor toward one side in a motor axial line direction, a supported face of the rotor which faces the one side in the motor axial line direction, and a support face of the fixed body which slidably supports the supported face of the rotor on the one side with respect to the supported face. When a first sliding load which is a total sliding load applied to the rotor is 'Ta', a detent torque acted on the rotor is 'Td', and a dynamic torque acted on the rotor by the stator is “Te”, then “Ta”, “Td” and “Te” satisfy the following expression:“Td”<“Ta”<“Te”.