Kabushiki Kaisha Toshiba

Toshiba Industrial Products Manufacturing Corporation

Other

Toshiba Industrial Products and Systems Corporation

Toshiba Infrastructure Systems & Solutions Corporation

Yutaka Hashiba

Norio Takahashi

Kazuto Sakai

Masanori Arata

Kazuaki Yuuki

Tadashi Tokumasu

Motoyasu Mochizuki

Yusuke Matsuoka

Makoto Matsushita

Katsutoku Takeuchi

Mikio Takabatake

Toshio Hasebe

Yuji Yamamoto

Daisuke Misu

Masakatsu Matsubara

Takashi Araki

Wataru Ito

Yukihiko Kazao

Masayuki Kawakami

Yasuo Kabata

Takashi Hanai

Yoshihiro Taniyama

Toshio Hirano

Yasuo Hirano

Hitoshi Katayama

Masayuki Takahashi

Yoshio Hashidate

Takaharu Tani

Makoto Mikami

Yosuke Otsubo

Masayuki Ichimonji

Takaaki Hirose

Ikuo Saito

Kuniyuki Araki

Tatsuo Taniguchi

Hidekazu Shiomi

Hisami Katsurayama

Takeshi Hayashi

Syou Fukumoto

Hirotsugu Tsutsui

Shiro Amemori

Koji Ooishi

Koji Oishi

A synchronous reluctance rotating electric machine of an embodiment has a rotor iron core provided with a plurality of air gap layers, and a stator. The rotor iron core has a plurality of band-shaped magnetic path layers, and at least one or more bridges that bridge across each of the air gaps adjacent to each other among the plurality of air gap layers. The bridges of the air gaps adjacent to each other are disposed on different straight lines.

Synchronous reluctance rotating electric machine

A synchronous reluctance motor includes: a rotor shaft; a rotor core fixed to the rotor shaft and on which a plurality of flux barriers are formed; a stator core on which a plurality of protruding stator teeth are formed; and multiphase armature windings of a plurality of poles wound around the plurality of stator teeth. The flux barriers include a plurality of first flux barriers formed to be spaced out in the circumferential direction from each other and extend in a radial direction, and a plurality of second flux barriers formed in each of circumferential angular regions sandwiched between the first flux barriers to form a curved surface convex toward the center of the rotation-axis and to spread and be spaced out in the circumferential direction from each other.

Synchronous reluctance motor and rotor for synchronous reluctance motor

A permanent magnet type rotary electric machine has a stator, a rotor which is rotatably provided inside the stator, and permanent magnets arranged in a rotor core of the rotor. An angle &#x3b8; between a straight line connecting the center of the rotor to a middle position between two permanent magnets arranged in the V shape, and a straight line connecting the center of the rotor to an outer circumferential top of one of the permanent magnets has the relation: 0.65&#x3c;&#x398;(=&#x3b8;/(180/P))&#x3c;0.80 in which P is the number of poles in the rotor. When a rear depth of a slot of the stator core is D, and a burying depth of the permanent magnet in the radial direction of the rotor core is t, D/t=A has the relation: 0.8&#x3c;A&#x3c;1.1.

Rotary electric machine using permanent magnet

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

According to one embodiment, there is provided an axial gap type permanent magnet electric rotating apparatus including a first and second rotor. All a magnetic-pole directions of a permanent magnets of the first and second rotor are the same. A portion between two permanent magnets along a circumferential direction of each rotor is made of a magnetic material having substantially the same size as that of the permanent magnet such that axial-direction surfaces are the same between the permanent magnets on two sides in the circumferential direction. Between the first rotor and the second rotor, a magnetic flux flows along an axial direction while making a loop and passes through an armature.

Axial gap type permanent magnet electric rotating apparatus and method of manufacturing the same

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.

An increase of the magnetization current can be prevented 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 rotor () is configured by a rotor core (), a variable magnetic force magnet () and a fixed magnetic force magnet (). A variable magnetic force magnet () and a fixed magnetic force magnet () are overlapped in the magnetization direction thereof to form a series of magnets. The series of magnets is located within the rotor core at a position where the magnetization direction is in the direction of a d-axis. On either side of the series of magnets of the variable magnetic force magnet () and the fixed magnetic force magnet (), fixed magnetic force magnets () are located at a position where the magnetization direction is in the direction of the d-axis. When the flux linkage of the variable magnetic force magnet is reduced, a current of an armature coil allows a magnetic field to act in the reverse direction to the magnetization direction of the variable magnetic force magnet. When the flux linkage of the variable magnetic force magnet is increased, a current of the armature coil allows a magnetic field to act in the same direction as the magnetization direction of the variable magnetic force magnet.

According to one embodiment, a permanent-magnet type electric rotating machine has a stator, a magnetizing coil, a rotor and a case. The stator has an armature coil configured to form a magnetic circuit for driving. The magnetizing coil is configured to form a magnetic circuit for magnetizing. The rotor has a constant magnetized magnet, a rotor core and a variable magnetized magnet. The rotor core holds the constant magnetized magnet. The constant magnetized magnet is arranged closer to the magnetic circuit for driving than the variable magnetized magnet. The variable magnetized magnet is arranged closer to the magnetic circuit for magnetizing than the constant magnetized magnet.

Permanent-magnet type electric rotating machine

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 diagnosis device for diagnosing loosening of a stator core of a rotary electrical machine. The diagnosis device has: excitation means for vibrating the stator core in the radial direction; vibration detection means for detecting the vibration of the stator core in the radial direction; means for frequency-analyzing an output signal of the vibration detection means that detects vibration generated in the stator core when the stator core is vibrated by the excitation means so as to extract a measurement natural vibration mode of the stator core in a circular ring natural vibration mode; means for estimating a circular ring natural vibration mode of the stator core from shape data of the stator core; and means for determining a clamping state of the stator core by comparing the measurement natural vibration mode and a determination criterion obtained based on the estimated natural vibration mode.

Stator core loosening diagnosis device and stator core loosening diagnosis method

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

Growing community of inventors

Yokosuka, Japan

Yutaka Hashiba