Toyota Jidosha Kabushiki Kaisha

Tatsuhiko Hirano

Daisuke Ichigozaki

Akira Yamashita

Shinya Sano

Takuya Nomura

Masaaki Ito

Kazuaki Haga

Toshimitsu Takahashi

Keiu Kanada

Yasuhide Yagyu

Kensuke Komori

Takeshi Tomonaga

Hisanori Koma

Kyoko Nakamura

Mayumi Takazawa

Hiroaki Wakimoto

Mitsutoshi Akita

Noritsugu Sakuma

Akihito Kinoshita

The production method of a rare earth magnet of the present disclosure includes a coated magnetic powder preparation step, a mixed powder preparation step, and a pressure sintering step. In the coated magnetic preparation step, a zinc-containing coatingis formed on the particle surface of a samarium-iron-nitrogen-based magnetic powder to obtain a coated magnetic powder. In the mixed powder preparation step, a binder powderhaving a melting point not higher than the melting point of the coatingand the coated magnetic powderare mixed to obtain a mixed powder. In the pressure sintering step, denoting as T° C. the temperature at which the peak disappears in an X-ray diffraction pattern of the binder powderand as T° C. the temperature at which the magnetic phase in the samarium-iron-nitrogen-based magnetic powderdecomposes, the mixed powder is pressure-sintered at T° C. or more and (T−50° C.) or less.

Production method of rare earth magnet

In an axial gap motor, a rotor includes a plurality of rotor cores fixed in a circumferential direction of a rotor base, and a stator includes a plurality of stator cores fixed in a circumferential direction of a stator base, and coils wound around the stator cores. End faces of each of the rotor cores and end faces of the corresponding stator core are opposed to each other while being exposed to each other.

Axial gap motor with curved rotor and stator cores

A rotating electrical machine capable of obtaining a higher torque while minimizing the amount of permanent magnets used. A rotor core includes a plurality of first insertion holes each having an auxiliary magnet embedded therein, the auxiliary magnet being embedded so as to surround a rotation axis of a rotor in a cross-section orthogonal to the rotation axis. The rotor core includes a plurality of second insertion holes each having a main magnet embedded therein, the main magnet being embedded so as to extend from the auxiliary magnet toward an outer circumferential direction of the rotor. The rotor includes a plurality of magnetic poles formed around the rotation axis, the magnetic poles each having the auxiliary magnet and the plurality of main magnets. The auxiliary magnet is arranged disproportionately on one side of the first insertion hole in the circumferential direction of the rotor so as to form a clearance on the other side of the first insertion hole.

Rotating electrical machine

A plurality of auxiliary magnets is embedded in a rotor core so as to surround the rotation axis of the rotating electrical machine in the cross-section orthogonal to the rotation axis. A plurality of main magnets is embedded in the rotor core so as to extend from the auxiliary magnet in the outer circumferential direction of the rotor. A plurality of magnetic poles of the rotor is formed around the rotation axis, the magnetic poles each having the auxiliary magnet and the plurality of main magnets arranged at a distance from each other in the circumferential direction of the rotor, and the plurality of main magnets of each magnetic pole is arranged asymmetrically about a virtual line passing the rotation axis and axisymmetrically dividing the auxiliary magnet of each magnetic pole.

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Toyota, Japan

Tatsuhiko Hirano