Permanent magnet type rotary electric device rotor

Abstract

A rotor of a permanent-magnet-type rotating electrical machine of the present invention has a plurality of magnetic poles in point symmetry with respect to a rotation center of a rotor core 2. For each of the magnetic poles, there are arranged a permanent magnet 3 whose product of a coercive force and a magnetizing direction thickness is small and a permanent magnet 4 whose product of a coercive force and a magnetizing direction thickness is large. The permanent magnet 3 whose product of a coercive force and a magnetizing direction thickness is small is irreversibly magnetized by a magnetic field created by a current of an armature coil 21, to change a total linkage flux amount. This realizes a wide-range variable-speed operation of high output, to provide the rotating electrical machine with a wide operating range and high efficiency.

Description

technical field

[0001] This invention relates to a rotor for a permanent magnet type rotating electric machine. Background technique

[0002] In general, permanent magnet type rotating electric machines are roughly classified into two types. There are surface magnet type permanent magnet type rotating electrical machines in which permanent magnets are pasted on the outer circumference of the rotor core, and embedded permanent magnet type rotating electrical machines in which permanent magnets are embedded in the rotor core. The latter embedded permanent magnet rotating electrical machine is suitable as a variable speed drive motor.

[0003] As the latter embedded permanent magnet rotating electrical machine, "Design and Control of an Embedded Magnet Synchronous Motor", a document published by Yoji Takeda et al., Oum Corporation" (Non-Patent Document 1) is known, and An embedded permanent magnet type rotating electrical machine described in Japanese Unexamined Patent Public...

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