Patent ID: 6486581
Filing Date: 2002-11-26
Classification: H02K

Abstract:
An interior permanent magnet synchronous motor comprising:a stator including a stator core provided with a plurality of magnetic pole sections having windings wound thereon; a rotor of which the number of pole pairs is p, wherein p is a positive integer of 1 or more; said rotor including a shaft and a rotor core fixed on said shaft; said rotor core having a plurality of permanent magnets incorporated therein in a manner to be spaced from each other at intervals in a peripheral direction thereof; said permanent magnets each constituting a permanent magnet magnetic pole section formed on an outer periphery of said rotor core; said rotor being formed with a plurality of magnetic salient pole sections so as to interpose said permanent magnet magnetic pole section therebetween; said rotor core including outer peripheral surface sections each positioned between each adjacent two of said magnetic salient pole sections; said magnetic pole sections of said stator core each including a magnetic pole surface; and each of said outer peripheral surface sections of said rotor core and said magnetic pole surface of each of said magnetic pole sections of said stator core being arranged so as to have a gap defined in a peripheral direction therebetween and having a size, &dgr;d, which satisfies the following expression: &dgr;d=&dgr;d0/cos(p&thgr;d) â€ƒwherein &dgr;d0 is a size of said gap which is determined along a virtual central line defined so as to extend through centers of two virtual lines extending from a center of said shaft through both ends of said outer peripheral surface section defined in a peripheral direction thereof and &thgr;d is an angle between said virtual central line and each of said virtual lines.