Hitachi, Ltd.

Japan Servo Co.,ltd.

Hitachi Industrial Equipment Systems Co., Ltd.

Hitachi Powdered Metals Co., Ltd.

Other

Nippon Telegraph and Telephone Corporation

Hitachi Metals, Ltd.

Masashi Kitamura

Yuji Enomoto

Fumio Tajima

Shigeru Kakugawa

Yutaka Matsunobu

Yasuaki Motegi

Takashi Kobayashi

Ryoso Masaki

Osamu Koizumi

Noriaki Hino

Motoya Ito

Chio Ishihara

Takashi Yasuhara

Junnosuke Nakatsugawa

Shoji Ohiwa

Takashi Ishigami

Katsuyuki Yamazaki

Kiyoshi Yamaguchi

Toshimi Abukawa

Kazuo Asaka

Mitsuaki Mirumachi

Norihisa Iwasaki

Kenya Takarai

Toshiyuki Innami

Takashi Ando

Naoki Maki

Masamichi Yagai

Yuji Takagai

Yuji Nomoto

Yuuji Enomoto

Jyoji Nakata

Hideki Nakamura

Shigeki Morinaga

Tsunehiro Endo

Suetaro Shibukawa

Kohji Maki

Hiroshi Kanazawa

Ken Nakamura

Kinya Kobayashi

Miyoshi Takahashi

Shinji Sugimoto

Masatsugu Nishi

Junya Kaneda

Yukio Kawabata

Takayuki Koyama

Yukinori Taneda

Susumu Tajima

Hakaru Sasaki

Akeshi Takahashi

Sachio Hatori

Shunji Kakiuchi

Hironori Matsumoto

Noriyuki Utsumi

Shinichiro Yokoyama

Koji Tsumaki

Yusuke Akami

Makoto Ochiai

Hiroshi Tomeoku

Kazuaki Shibahara

Masahide Yamazaki

Masayuki Nakajima

Yasumichi Uno

Kazumasa Ide

The present invention is intended to provide a magnetic gear structure that realizes a magnetic gear that transmits a torque efficiently by reducing eddy currents generated in the interior of magnets. In order to solve the subject described above, in the magnetic gear structure, a structure in which magnets are arranged in the interior of an iron core in an inner rotor portion. Bonded magnets formed by molding, for example, NdFeB powder may be used as the magnets. Since the influence of the eddy current on the side of an outer rotor having a larger pole number is large, a structure in which the magnets are arranged in the interior only of an outer rotor portion having a larger pole number is also applicable. In addition, the magnets to be embedded may be divided into a plurality of pieces. The finer the division of the magnets, the less eddy currents are generated, so that a method of further fining down and assembling the same is also effective. Further reduction of the eddy currents is possible by laminating the plate-shaped magnets having a thickness equivalent to an electromagnetic steel plate in the axial direction.

Magnetic gear mechanism

A magnetic gear mechanism including a simplified assembly of a magnetic flux modulating section in the magnetic gear mechanism which improves the strength thereof. In the magnetic flux modulating section of the magnetic gear mechanism, the magnetic flux modulating section being formed of a magnetic member and a non-magnetic member, a piece of the magnetic member and a piece of the non-magnetic member are separately produced. The piece of the magnetic member is sandwiched between circumferential projections provided in pieces of the non-magnetic member, and the magnetic member and the non-magnetic member and bearing holding sections form a structure in which the magnetic member and the non-magnetic member are fitted into the bearing holding sections by using recessed portions provided in the bearing holding sections and axial projections provided in the pieces of the non-magnetic member. This structure simplifies production and improves strength.

Magnetic gear mechanism including a plurality of rotors or stators

A method for analyzing an operating point of a permanent magnet performs electromagnetic field analysis based on a B-H curve of the permanent magnet and element data concerning a finite number of elements into which the permanent magnet is divided to obtain the operating point of the permanent magnet. The method includes the steps of storing data of inputted B-H curve; obtaining magnetic flux densities and magnetic fields in plural regions of the permanent magnet by performing the electromagnetic field analysis based on the data of the B-H curve; and obtaining the operating point of each of the elements based on the result of the electromagnetic field analysis by employing a variable, the variable continuously varying in a first quadrant, in a second quadrant, in a third quadrant, and over these quadrants of the B-H curve and linearly varying with respect to the magnetic flux density and magnetic field.

Method for analyzing operating point of permanent magnet, program therefor, and recording medium

There is disclosed a rotary electromotor including a stator, a stator winding on the stator, a stator frame, a rotator, end covers, and a highly heat-conductive member. The stator has a plurality of magnetic poles. The stator frame supports the stator. The rotator is supported by the stator with a gap therefrom such that the rotator is rotatable. The end covers close opposite ends of the stator frame. The highly heat-conductive member is fixed by a resin material in a space defined inside the stator, the stator frame, and the end covers.

Heat radiation structure for rotary electromotor

A permanent magnet rotating electric machine comprises a stator having stator windings wound round a stator iron core and a permanent magnet rotor having a plurality of inserted permanent magnets in which the polarity is alternately arranged in the peripheral direction in the rotor iron core. The rotor iron core of the permanent magnets is composed of magnetic pole pieces, auxiliary magnetic poles, and a stator yoke, and furthermore has concavities formed on the air gap face of the magnetic pole pieces of the rotor iron core of the permanent magnets, gently tilting from the central part of the magnetic poles to the end thereof. In a permanent magnet rotating electric machine, effects of iron loss are reduced, and an electric car using highly efficient permanent magnet rotating electric machine are realized.

Rotating electric machine having rotor embedded-permanent-magnets with inner-end magnetic gaps and outer-end magnetic gaps, and electric car using the same electric machine

Permanent magnet rotating electric machine and electric car using the same

A pump is driven by a compact electric motor in which a coil is disposed in a ring form around and along a stator core which has a plurality of claw magnetic poles that extend alternately from both ends of one member of the stator core toward the end of the other member thereof. A stator core can be made from a compressed powder core by molding with resin, with the molded portion able to serve as a partition separating pump and motor units.

Electric pump

A cylindrical linear motor includes a stator and a movable element disposed via a clearance with respect to the stator and movable rectilinearly with respect to the stator. The movable element has a plurality of permanent magnets fixed to a movable element core. The stator salient polesare pitched at &#x3c4;s and the permanent magnetsare pitched at &#x3c4;p so that a relationship of 3/4&#x3c;&#x3c4;p/&#x3c4;s&#x3c;3/2 is established.

Cylindrical linear motor and a vehicle using the same

Electric Pump

To realize reduction in vibration and noise while utilizing reluctance torque, a rotating electrical machine includes: a rotor having permanent magnets disposed in a cylindrical surface coaxial with a rotary shaft; and a stator having an annular stator core disposed coaxially with the rotary shaft, and a annular coil for magnetizing the stator core. The stator core has an annular part covering the annular coil, claws disposed at equal intervals in an inner radius surface of the annular part and extending axially, and magnetic gaps formed between neighboring claws. The number of claws is equal to the number of permanent magnets, and magnet flux in a direction orthogonal to a center axis of the magnetic pole of the permanent magnet at right angles in electric angle is larger than magnetic flux in the center axis direction generated between neighboring permanent magnets. Metal interpoles are provided between neighboring permanent magnets.

Claw-teeth-type rotating electrical machine

A stator of a rotating electric machine includes a stator core, and multiphase stator coils incorporated in the stator core. The stator core is formed by connecting a plurality of split core pieces. Each of the stator coils is wound around a coil bobbin installed on the outer periphery of the tooth portion of a respective one of the core pieces, by a concentrated winding method; and around mutually adjacent tooth portions, the respective coils that have the same phase and mutually different in the winding direction are continuously wound. A crossover wire for connecting the first stator coil wound around the first tooth portion and the second stator coil wound around the second tooth portion, is located at a position further toward the central side in the axial direction of the coil bobbin than the end portion of the coil bobbin, inclusive of this end portion.

Production method for rotating electric machine and stator coils, and electric power steering motor

A claw teeth type electric rotary machine comprises a stator including an annular core with claws formed from a powder core and an annular coil installed inside the annular core, and a rotor rotatably positioned inside the stator. An inner edge of the annular core is provided with plural claw poles which are protruded at a predetermined interval in a circumferential direction and extended in an axial direction of the annular core so as to alternately meshes with each other. The stator comprises the annular core with claws, the annular coil, and a molded nonmagnetic potting material filled between the annular core with claws and annular coil, so that the annular core with claws and annular coil are integrated with the molded potting non-magnetic material.

Claw teeth type electric rotary machine and manufacturing method for stators

It is made easy for a stator winding to be wound around a stator core and degradation in efficiency is prevented as much as possible. A stator () includes a plurality of phases, i.e., of circumferentially divided stator magnetic poles (). The stator magnetic poles () are each composed of an arcuate stator core () having a plurality of axially extending claw poles () and a circumferentially elliptically wound stator winding (). The stator magnetic poles () are magnetically divided; therefore, magnetic flux leakage is reduced to improve efficiency. Air flowing between the stator magnetic poles () can improve a cooling effect.

Rotating electrical machine and alternating-current generator

A three-phase permanent magnet brushless motor comprises a stator having three-phase windings, and a rotor having a permanent magnet with a plurality of poles for serving as a field magnet. The stator comprises a stator core which includes a powder core that is compacted at a high density in at least teeth thereof. A combination of the number of magnetic poles of the rotor with the number of slots of the stator satisfies a condition that a least common multiple of the number of slots and the number of magnetic poles is 60 or more in a region in which the number of magnetic poles is 16 or less, and the number of slots is 12 or less. The powder core is made by compacting magnetic powders to have a green density of 7.5 g/cmor higher.

Three-phase permanent magnet brushless motor

Growing community of inventors

Mito, Japan

Masashi Kitamura