| 摘要 |
PROBLEM TO BE SOLVED: To provide a permanent magnet type rotating electrical machine capable of variable speed operation ranging from low speed to high speed with high output, by suppressing increase in magnetized current, when magnetization is decreased or increased. SOLUTION: A rotor 1 includes a rotor core 2, a permanent magnet 3 having a small product of a coercive force and a magnetization direction, and permanent magnets 4 having a large product of a coercive force and a magnetization direction. A permanent magnet 3 is disposed ar the center of magnetic poles, and the permanent magnets 4 are disposed between magnetic poles. Cavities 5 used as a magnetic barrier are each disposed on the outer circumference of the permanent magnets 4 and reduce a cross-sectional area S of a magnetic passage located on the inner circumference side. When the interlinkage magnetic flux of the permanent magnet 3 is reduced, a magnetic field having a direction reverse to that of the magnetization direction of the permanent magnet 3 is allowed to act by a current of an armature winding. When the interlinkage magnetic flux of the permanent magnet 3 is increased, the magnetic flux of the direction same as the magnet magnetization direction is allowed to act by a current of the armature winding. The magnetic barriers 5 and the small cross-sectional area S of the magnetic passage prevent the permanent magnet 3 from an increase or decrease in magnetization by a magnetic field A, caused by the magnetization current and a magnetic field C of the permanent magnet 4. COPYRIGHT: (C)2010,JPO&INPIT |
