Kabushiki Kaisha Toshiba

Toshiba Industrial Products Manufacturing Corporation

Toshiba Infrastructure Systems & Solutions Corporation

Mikio Takabatake

Kazuto Sakai

Masanori Arata

Yoshio Hashidate

Norio Takahashi

Yosuke Nakazawa

Makoto Matsushita

Tadashi Tokumasu

Ryoichi Kurosawa

Yutaka Hashiba

Masakatsu Matsubara

Wataru Ito

Masafumi Fujita

Koji Matsuyama

Mikio Kakiuchi

Motoyasu Mochizuki

Yasuo Kabata

Takashi Hanai

Daisuke Misu

Katsutoku Takeuchi

Hitoshi Katayama

Hiroaki Makino

Fumiaki Ito

Yoshiyuki Shimoda

Shiro Amemori

Koji Oishi

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

A rotor for a rotating electrical machine suppresses demagnetization of permanent magnets without deteriorating motor characteristics, is low-cost, and is highly reliable. The rotor has a plurality of rotor cores that are stacked together, a plurality of permanent magnets axially divided by the rotor cores and circumferentially arranged on each of the rotor cores, to circumferentially form magnetic irregularities, and a rotor blank made of nonmagnetic material arranged between those of the rotor cores that are adjacent to each other.

Rotor for rotating electrical machine

A rotor of a rotating electric machine includes a cylindrical rotor core, a plurality of coil slots provided on an outer periphery of the rotor core along a rotor axis direction, rotor coils disposed in the coil slots by laminating a plurality of field conductors through an insulation material, a rotor wedge disposed at an opening end portion of the coil slot so as to support the rotor coil, a coil ventilation duct formed in the coil slot so as to pass through the rotor coils, the rotor wedge and the insulation material, and sub-slots provided at bottom portions of the coil slots so as to be communicated with rotor core ends and the coil ventilation ducts. In such a rotor of a rotating electric machine, the coil slot, the sub-slots and the coil ventilation duct constitute a cooling gas channel for distributing a cooling gas to thereby cool the rotor coils. A depth in a diameter direction of each sub-slot from the rotor coil end to a nearest coil ventilation duct is larger than a depth of the sub-slot at a portion near a center of the rotor core.

Rotating electric machine with rotor cooling slots

For an electrical reluctance rotary machine, a stator has a winding as an armature, and a rotor has permanent magnet implanting slots provided in a rotor core at lateral sides magnetic poles configured to produce reluctance torque along directions of magnetic flux passing through the magnetic poles to produce reluctance torque, and permanent magnets inserted in the permanent magnet implanting slots so as to cancel magnetic flux of the armature intersecting that magnetic flux, to control a magnetic field leaking at ends of the magnetic poles, having circumferential magnetic unevenness. The electrical reluctance rotary machine is configured to meet a relationship, such that where W[mm] is a width of permanent magnet, R [mm] is a radius of the rotor, and P is the number of poles.

Permanent-magnet reluctance electrical rotary machine

A reluctance type rotating machine includes a stator having armature windings arranged on an inner periphery of the stator , a rotor having a magnetic unevenness in the circumferential direction and a plurality of permanent magnets arranged for negating the armature windings' flux passing between adjoining poles. Each magnet is magnetized in a direction different from a direction to facilitate the rotor's magnetization. A magnetic portion is provided between the pole and the interpole of the rotor . Owing to the provision of the magnetic portion , when the armature windings are not excited, more than 30% of the permanent magnets' flux is distributed in the rotor . Similarly, when the machine is loaded, the permanent magnets' interlinkage flux is more than 10% of composite interlinkage flux composed of armature current and the permanent magnets.

Reluctance type rotating machine with permanent magnets

A reluctance type rotating machine includes a stator having armature windings arranged on an inner periphery of the stator a rotor having a magnetic unevenness in the circumferential direction and a plurality of permanent magnets arranged for negating the armature windings' flux passing between adjoining poles. Each magnet is magnetized in a direction different from a direction to facilitate the rotor's magnetization. A magnetic portion is provided between the pole and the interpole of the rotor Owing to the provision of the magnetic portion when the armature windings are not excited, more than 30% of the permanent magnets' flux is distributed in the rotor Similarly, when the machine is loaded, the permanent magnets' interlinkage flux is more than 10% of composite interlinkage flux composed of armature current and the permanent magnets.

A reluctance type rotating machine includes a stator,having armature windings,arranged on an inner periphery of the stator,a rotor,having a magnetic unevenness in the circumferential direction and a plurality of permanent magnets,arranged for negating the armature windings' flux passing between adjoining poles. Each magnet,is magnetized in a direction different from a direction to facilitate the rotor's magnetization. A magnetic portion,is provided between the pole and the interpole of the rotor,Owing to the provision of the magnetic portion,when the armature windings are not excited, more than 30% of the permanent magnets' flux is distributed in the rotor,Similarly, when the machine is loaded, the permanent magnets' interlinkage flux is more than 10% of composite interlinkage flux composed of armature current and the permanent magnets.

A rotor is provided for a permanent magnet type rotating machine having a stator,with armature windings,. The rotor,includes a rotor core,and a plurality of permanent magnets,arranged in the rotor core,so as to negate magnetic flux of the armature windings,passing through interpoles,. The rotor,is constructed so that the average of magnetic flux in an air gap,between the rotor,and the stator,, which is produced by the permanent magnets,at the armature windings' de-energized, ranges from 0.1 &lsqb;T&rsqb; to 0.7 &lsqb;T&rsqb; and the ratio (Lq/Ld) of self-inductance of the magnetic portion in a hard-magnetizing direction (q-axis) to self-inductance in an easy-magnetizing direction (d-axis) under a rated load condition ranges from 0.1 to 0.8. Under these conditions, it is possible to realize the rotating machine which operates as an induction machine at the machine's starting and also operates as an synchronous machine at the rated driving due to smooth pull-in.

Rotor for permanent magnet type rotating machine

Growing community of inventors

Yokohama, Japan

Mikio Takabatake