Kabushiki Kaisha Toshiba

Toshiba Infrastructure Systems & Solutions Corporation

Fumiaki Ito

Makoto Matsushita

Daisuke Misu

Katsutoku Takeuchi

Norio Takahashi

Masakatsu Matsubara

Toshio Hasebe

Mikio Takabatake

Hiroaki Makino

According to one embodiment, a first permanent magnet and a second permanent magnet are disposed in each magnetic pole of a rotor core. When angular coordinates of intersections of a flux line in a d-axial direction passing an outer end Aof the first permanent magnet, a flux line in the d-axial direction passing through an inner end Aof the first permanent magnet, a flux line in the d-axial direction passing an outer end Bof the second permanent magnet, a flux line in the d-axial direction passing an inner end Bof the second permanent magnet and a circumscribing circle of the rotor core are respectively defined as θ, θ, θand θ, the θ, θ, θand θsatisfy a formula (−34/p<(θ-θ)<22/p, −34/p<(θ−θ)<22/p).

Permanent magnet rotary electric machine including flux barriers shaped along flux lines

According to one embodiment, an induction motor includes a stator and a rotor. The stator has a stator coil disposed at a stator core having a plurality of stator slots. The rotor has a rotor core rotatably provided with respect to the stator. The rotor core includes a plurality of rotor teeth and a rotor slot formed between the plurality of rotor teeth and having a rotor conductor disposed therein. The rotor teeth include a teeth main body and a flange. The teeth main body extends in a radial direction of the rotor core. The flange extends in a rotating direction of the rotor core from a distal end of the teeth main body. Then, a recessed surface is formed on at least part of an outer circumferential surface of a radial outer side in the flange.

Induction motor including rotor teeth having an inclined surface

Growing community of inventors

Fuchu, Japan

Fumiaki Ito