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:
Oct. 14, 2003
Filed:
Oct. 03, 2000
Applicant:
Inventors:
Assignee:
Seiko Epson Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G04B 1/00 ; G04C 3/00 ; H02P 9/40 ;
U.S. Cl.
CPC ...
G04B 1/00 ; G04C 3/00 ; H02P 9/40 ;
Abstract
An inside notch ( ) serving as an adjusting section is provided for a magnetic balancing adjustment between stators ( and ) and a rotor ( ). The inside notch acts to reduce cogging torque, thereby allowing the rotor to rotate using a slight torque. Therefore, the rotor can be more readily started without using a complicated structure, can be prevented from easily stopping due to an external disturbance, and can be made more reliable. In reducing the cogging torque, it is not necessary to reduce the number of magnetic flux lines by, for example, making a rotor magnet ( ) smaller, making it possible to maintain the efficiency with which electrical power is produced.