Permanent Magnet Rotor And Permanent Magnet Rotating Electrical Machine

Abstract

A permanent magnet rotating electrical machine can guarantee the demagnetization resistance and realizes the low cost. The permanent magnet rotating electrical machine 100 comprises a rotor shaft 11, a rotor iron core 12 possessing a laminated plate formed by a plurality of steel plates; a plurality of permanent magnets 51a, 51b; a stator iron core 21 arranged at the periphery of the rotor iron core and formed with the stator pole teeth 22; armature windings 24 wound on the stator pole teeth 22. The flux barriers 31a, 31b are formed in each circumferential angle region so as to extend axially, spread circumferentially toward the rotation axis center in a convex curved shape. A permanent magnet space is formed in a circumferential direction center portion of each of the flux barriers. The permanent magnets are disposed in the respective permanent magnet space in which demagnetization resistance monotonically decreases from the outside to the inside in a radial direction between permanent magnets adjacent to each other radially.

Description

technical field [0001] The present invention relates to a permanent magnet rotor and a permanent magnet rotating electrical machine with the permanent magnet rotor. Background technique [0002] A permanent magnet type rotating electrical machine has a rotor and a stator. In respective circumferential regions on the rotor core provided on the radially outer side of the rotor shaft of the rotor, flux barriers as magnetic force barriers are formed. Furthermore, the circumferential central region of the flux barrier is provided with permanent magnets. As permanent magnets, there are known permanent magnets whose axial cross-section follows a circular arc (see Patent Document 1) or rectangular permanent magnets (see Patent Document 2). [0003] Figure 4 It is a partial cross-sectional view of a quarter of a conventional permanent magnet rotating electrical machine perpendicular to the rotating shaft, showing a quarter of the range in the circumferential direction. also, Fi...

AI Technical Summary

Problems solved by technology

In particular, if a magnet with a strong coercive force (a neodymium magnet with a large Dy content, etc.) is used in order to ensure the demagnetization resistance on the radially outer side, the cost of such a magnet is high, and the cost cannot be sufficiently reduced.

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