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:
Nov. 26, 2002
Filed:
Mar. 30, 2001
Sanyo Denki Co., Ltd., Tokyo, JP;
Abstract
An interior permanent magnet synchronous motor capable of significantly restraining cogging torque and torque pulsation during feeding of electricity thereto. Each of the outer peripheral surface sections of a rotor core and a magnetic pole surface of each of magnetic poles of a stator core are arranged so as to have a gap defined therebetween and having a size &dgr;d which satisfies an expression &dgr;d=&dgr;d /cos(p&thgr;d), wherein &dgr;d is a size of the gap which is determined along a virtual center line defined so as to extend through centers of two virtual lines extending from a center of a shaft through both ends of the outer peripheral surface section defined in a peripheral direction thereof and &thgr;d is an angle between the virtual central line and each of the virtual lines.