Toyota Jidosha Kabushiki Kaisha

Reimi Sakaguchi

Daisuke Ichigozaki

Masaaki Ito

Noritsugu Sakuma

Motoki Hiraoka

Takuya Nomura

Keiu Kanada

Akihito Kinoshita

Mitsutoshi Akita

The present disclosure provides a rare earth magnet having a main phase and a grain boundary phase and a manufacturing method therefor. In the rare earth magnet of the present disclosure, the overall composition is represented by a formula (RLaCe)(FeCo)BM. (Ris a predetermined rare earth element, Mis a predetermined element, and the followings are satisfied, 0.05≤x≤0.25, 0.5≤y/(x+y)≤0.50, 13.5≤u≤20.0, 0≤z≤0.100, 5.0≤w≤10.0, and 0≤v≤2.00). The main phase has an RFeB-type crystal structure, and the average grain size and the volume fraction of the main phase are respectively 1.0 μm to 20.0 μm and 80.0% to 90.0%. The main phase and the grain boundary phase satisfy, (the existence proportion of La in the grain boundary phase)/(the existence proportion of La in the main phase)>1.30.

Rare earth magnet and manufacturing method therefor

Provided is a motor capable of increasing a torque while suppressing an increase in the physical size of the motor. A motor includes a rotor. The rotor includes pairs of magnet slots evenly spaced in a circumferential direction, each pair of magnet slots being arranged in a V-shape, pairs of main magnets housed in the pairs of magnet slots, and a plurality of auxiliary magnets including an outer magnet housed in an outer end in the circumferential direction in each of the pairs of magnet slots. The motor satisfies at least one of a first condition that the main magnets are sintered magnets and the auxiliary magnets are bonded magnets, or a second condition that magnetization directions of the main magnet and the outer magnet housed in the same magnet slot intersect outside in the radial direction so as to define an acute angle.

Motor

The method for manufacturing the Halbach magnet array includes the steps of: (a) magnetizing at least two first magnetic material pieces in a direction parallel to a first direction, and (b) magnetizing at least one second magnetic material piece in a direction parallel to a second direction perpendicular to the first direction, in this order. In the step (a), the first magnetic material pieces and the second magnetic material piece are alternately arranged in the second direction with the first magnetic material pieces being each adhered to the adjacent second magnetic material piece, and the magnetization is performed under a condition in which a residual magnetization ratio rof the first magnetic material pieces is higher than a residual magnetization ratio rof the second magnetic material piece.

Method for manufacturing Halbach magnet array

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Nisshin, Japan

Reimi Sakaguchi