Kabushiki Kaisha Toshiba

Toshiba Infrastructure Systems & Solutions Corporation

Toshiba Industrial Products Manufacturing Corporation

Yusuke Matsuoka

Norio Takahashi

Tadashi Tokumasu

Kazuto Sakai

Yutaka Hashiba

Kazuaki Yuuki

Masanori Arata

Masakatsu Matsubara

Motoyasu Mochizuki

Hideki Hisada

Takashi Hanai

Masaru Kano

Wataru Ito

Yosuke Otsubo

Kazuo Aoki

According to one embodiment, a rotor core satisfies a relationship: WW&#x2264;(AA)/AWhere, Arepresents an area of a region defined by a polar central axis, an outer circumferential surface of the rotor core and a first imaginary linear line extending on an outer circumferential-side long edge of an embedding hole, Arepresents an area of a region defined by the polar central axis, a q-axis, the outer circumferential surface of the rotor core, a second imaginary linear line extending on an inner circumferential-side long edge of the embedding hole, a third imaginary linear line extending on a first edge of the cavity hole, Wrepresents a half-width of a first bridge portion, and Wrepresents a half-width of the second bridge portion.

Rotary electric machine

According to one embodiment, a rotor includes a rotor core including magnetic poles arranged in a circumferential direction, a cavity formed on an axis q and extending toward a central axis, and a flux barrier band formed in the magnetic pole between a pair of the cavities to cross an axis d and including a first bridge part facing one cavity, a second bridge part facing the other cavity, and a magnet embedding hole formed between the first and the second bridge parts, a first permanent magnet formed of a fixed magnetic force magnet and disposed in the magnet embedding hole to be adjacent to the first bridge part, and a second permanent magnet formed of a variable magnetic force magnet and disposed in the magnet embedding hole to be adjacent to the second bridge part.

Rotor and rotary electric machine

A rotary electric device includes a stator, and a rotor including a rotor core having magnetic poles and permanent magnets at the magnetic poles. Each of two embedding holes in each magnetic pole includes a loading region in which the permanent magnet is loaded, an inner periphery-side gap, and an outer periphery-side gap. Defining D as the minimum distance from the outer periphery-side gap to an outer peripheral surface of the rotor core, Was the width of a teeth of the stator, H0 as the sum of the magnetomotive forces generated in the portion corresponding to a magnetic pole angle &#x398; in one magnetic pole, and H1 as the magnetomotive force generated in one tooth, the rotor core is formed such that D&#x2265;W&#xd7;(H0/H1).

Rotary electric device

According to one embodiment, a rotor of an electric rotating machine includes a shaft, a rotor core, and a plurality of permanent magnets. Two first permanent magnets are arranged in line symmetry with a pole center and are arranged gradually away from the pole center as the two first permanent magnets extend from first ends toward second ends thereof. Two second permanent magnets are arranged in line symmetry with the pole center and are arranged gradually away from the pole center as the two second permanent magnets extend from third ends toward fourth ends thereof. Angles &#x3b8;are set to satisfy the relationships of &#x3b8;, and 70 degrees&#x2264;&#x3b8;&#x2264;110 degrees.

Rotor of electric rotating machine

According to one embodiment, a rotor is configured by a rotor core and magnetic poles. Two or more types of permanent magnets are used such that each product of coercivity and thickness in the magnetization direction becomes different. A stator is located outside the rotor with air gap therebetween and configured by an armature core winding. At least one permanent magnet is magnetized by a magnetic field by a current of the armature winding to change a magnetic flux content thereof irreversibly. A short circuited coil is provided to surround a magnetic path portion of the other permanent magnet excluding the magnet changed irreversibly and a portion adjacent to the other permanent magnet where the magnetic flux leaks. A short-circuit current is generated in the short circuited coil by the magnetic flux generated by conducting a magnetization current to the winding. A magnetic field is generated by the short-circuit current.

Permanent magnet electric motor

A permanent magnet type rotating electrical machine includes a rotor having a rotor core. Magnet holes circumferentially arranged at regular intervals in the rotor core include pairs of first magnet holes and pairs of second magnet holes. Each pair of first magnet holes are symmetric with respect to an imaginary line extending through a rotor core center. Each pair of second magnet holes are located on a radially inner side of the rotor core and are symmetric with respect to the imaginary line. Each pair of second magnet holes are located on an inner circumferential side of the paired first magnet holes with respect to a radial direction of the rotor core. A first magnet angle made by permanent magnets located in each pair of first magnet holes is larger than a second magnet angle made by permanent magnets located in each pair of second magnet holes.

Permanent magnet type rotating electrical machine

An increase of the magnetization current can be restrained during demagnetization and magnetization, and a variable speed operation can be achieved at a high power output over a wide range of from a low speed to a high speed. A rotoris configured by a rotor core, permanent magnetshaving a small value as the product of the coercivity and the thickness in the magnetization direction thereof, and permanent magnetshaving a large value as the product. When reducing a flux linkage of the permanent magnets, a magnetic field directed to the reverse direction of the magnetization direction of the permanent magnetsdue to a current of an armature coil is caused to act on them. When increasing a flux linkage of the permanent magnets, a magnetic field directed to the same direction as the magnetization direction of the permanent magnetsdue to a current of an armature coil is caused to act on them. A short circuit coilis located in a magnetic path part of each permanent magnetother than the permanent magnets. A magnetic field due to a magnetization current induces an induced current to generate a magnetic field on the periphery of the short circuit coil. The generated magnetic field and the magnetization current generate a magnetic field to magnetize the permanent magnets

Permanent magnet electric motor inducing short circuit current in short circuit coil

A rotor has rotor cores divided in the axial direction. A permanent magnet is mounted at the position of each of the magnetic poles of cores. The permanent magnet of each magnetic pole is configured by a single tabular member that penetrates the two divided cores in the axial direction. Convex parts are respectively provided on the outer peripheries of the respective magnetic poles of the rotor cores along the axial direction of the rotor. The convex parts are provided to positions that are displaced for each of the two divided cores. The magnetic flux density increases in the convex parts, which becomes the magnetic pole center. Since the convex parts positions are displaced to each other, a skew function can be exhibited even if the permanent magnet is mounted at the same position.

Growing community of inventors

Mie-gun, Japan

Yusuke Matsuoka