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:
Sep. 06, 2011
Filed:
Mar. 30, 2009
Toshihito Miyashita, Nagano, JP;
Masahiro Yamaguchi, Nagano, JP;
Toshihito Miyashita, Nagano, JP;
Masahiro Yamaguchi, Nagano, JP;
Sanyo Denki Co., Ltd., Tokyo, JP;
Abstract
A motor with an electromagnetic brake is provided that is capable of sufficiently reducing influence of leakage magnetic flux on a magnetic sensor. A second ball bearing is configured to be ferromagnetic. An inner circumferential surface of a bearing stopper member that faces the shaft is disposed in proximity to the outer circumferential surface of the shaft. The bearing stopper member, which is ferromagnetic, is fixed to the second bearing holder in order to prevent the second ball bearing from getting out of a bearing fitting portion. A magnetic shield member is fixed to a portion of the shaft between the bearing stopper member and a magnetic sensor. The magnetic shield member guides leakage magnetic flux, which has been generated by an electromagnetic coil and leaked through the shaft, from the shaft to the bearing stopper member, thereby reducing influence of the leakage magnetic flux on the magnetic sensor.