Hitachi, Ltd.

Hitachi Industrial Products, Ltd.

Tetsuo Fujigaki

Motonobu Iizuka

Mamoru Kimura

Daisuke Kori

Takeshi Nakayama

Kazumasa Ide

Kazuo Nishihama

Yoshihiro Yasui

Masanori Matsumoto

Shuji Mizutani

Akiyoshi Komura

Yasushi Hayasaka

Hiroyuki Mikami

Atsushi Fukunaga

Yasunori Otsuki

Atsushi Abe

Kazuo Sato

Masahiro Hori

Yuji Yamamoto

Masaaki Endo

Takashi Yabutani

Yasushi Iwai

Youichi Matsumoto

Motonobu Iiduka

Taichirou Yabuno

Takaaki Miyabe

Shuuji Mizutani

Shuji Aizawa

Masaaki Endou

Tomomichi Ito

Kengo Iwashige

Masanori Sawahata

Yusaku Maruno

Nobuhiro Kusuno

Masakatsu Sato

Naoki Kunihiro

Hisato Tagawa

Mamoruo Kimura

Ai Nagano

Eiichirou Tokizaki

Shogo Serita

A method for manufacturing a neutral ring includes connecting a cut-off neutral ring to an arc-shaped connection element. The method also includes filling an insulator between the cut-off neutral ring and a connection element. The neutral ring shunts the rotor coil in three phases.

Method for manufacturing a neutral ring for use in rotating electrical machine

A permanent magnet electrical rotating machine is provided which is capable of contributing to protected permanent magnets and increased cooling performance during operation. The permanent magnet electrical rotating machine includes: permanent magnets; rotor cores that have the permanent magnets mounted thereto and are laminated in a rotating axis direction; spacers that are placed between adjacent rotor cores; and permanent magnet protection members that are installed between the permanent magnets and the rotor cores and also placed to maintain radial continuity in space partitioned by the spacers between the rotor cores.

Permanent magnet electrical rotating machine with protection members arranged between permanent magnets and rotor cores

A rotating electric machine comprises a field winding provided on a rotor iron core and a neutral ring supported independently of the field winding, wherein: the field winding and the neutral ring are electrically connected to each other through a connecting wire; the neutral ring is disposed spaced with respect to the rotor iron core; and the connecting wire absorbs the stress difference between the field winding and the neutral ring when a centrifugal stress is applied.

Rotating electric machine or wind power generation system

A rotating electrical machine includes a rotor core, a rotor shaft, a coil, a bind, a lead-out wire of which one end is connected to the coil and the other end is connected to a neutral ring. A filling is filled between the coil and the neutral ring. The neutral ring is formed with a plurality of members that are connected with one another to have flexibility.

Neutral ring for use in rotating electrical machine and method for manufacturing the same

In a permanent magnet rotating electrical machine including a stator, a rotor obtained by stacking a plurality of rotor cores arranged with magnet insertion holes in layers with gaps, and permanent magnets inserted to the magnet insertion holes, the magnet insertion holes are formed on both sides of the duct piece so as to depart from the duct piece disposed between the rotor cores as the magnet insertion holes extend from the side of the center of the rotor core to the outer circumference side, the magnet insertion holes are disposed so as to shift from the duct piece in the circumferential direction of the rotor, and inner circumference side voids having the length in the circumferential direction wider than the thickness in the circumferential direction of the permanent magnets are provided from the inner circumference side ends of the permanent magnets toward the duct piece.

Permanent magnet rotating electrical machine

An electrical rotating machine system that can be easily maintained and can provide improved power generation efficiency. The electrical rotating machine system includes: a first electrical rotating machine having a first stator that has first stator windings, and a first rotor that has first rotor windings and is disposed on the internal diameter side of the first stator so as to have a gap between the internal diameter side of the first stator and the first rotor itself; a second electrical rotating machine having a second stator that has second stator windings, and a second rotor that has second rotor windings and is disposed on the internal diameter side of the second stator so as to have a gap between the internal diameter side of the second stator and the second rotor itself; and at least one power converter that is electrically connected to the first rotor windings and the second rotor windings, and configured to rotate when the first rotor rotates.

Electrical rotating machine system or wind turbine system

An electrical rotating machine includes: a rotating shaft; a rotor, equipped with permanent magnets, and formed to rotate with the rotating shaft, a stator disposed in opposition on an outside-diametral side and via a clearance with respect to the rotor; and anti-demagnetization conductors extending in the axial direction of the shaft, the conductors each being disposed inside the rotor, wherein: the anti-demagnetization conductors are provided in pairs of two for each of magnetic poles of the rotor; the two anti-demagnetization conductors forming a pair are electrically interconnected; and, inside the rotor, the two paired anti-demagnetization conductors are disposed at different-polarity sides of two corresponding permanent magnets in a circumferential direction of the rotor, the different-polarity sides each being more adjacent to the circumferential direction of the rotor than to an end portion of one of the two corresponding permanent magnets existing close to each other in one magnetic pole.

Electrical rotating machine

The permanent magnet rotating electric machine comprising a stator with a stator coil wound on a stator iron core, a rotor with a plurality of permanent magnets disposed in the circumferential direction in a rotor iron core, which is disposed opposite to the stator iron core of the stator with a predetermined spacing therebetween and is fixed to a shaft, a water-cooling unit disposed around the outer circumference of the stator iron core, and a fan fixed to the shaft on the same side as at least one axial end of the rotor iron core to circulate cooling air in the permanent magnet rotating electric machine;

Permanent magnetic rotating electric machine and wind power generating system

A synchronous generatorincluding a rotor having a field winding placed in the slots thereof and a stator having an armature winding placed in the slots thereof, wherein the value of the number of slots per two poles in stator minus the number of slots per two poles in rotor is equal to or greater than +9, or equal to or smaller than &#x2212;9.

Synchronous generator and synchronous generator system for reducing distortion of current waveform

A permanent magnet electrical rotating machine having a permanent magnet rotor and a stator, wherein:

Permanent magnet electrical rotating machine, wind power generating system, and a method of magnetizing a permanent magnet

A permanent magnet electrical rotating machine having a permanent magnet rotor and a stator, wherein: a plurality of permanent magnets are disposed in a rotor iron core of the permanent magnet rotor along a periphery of the rotor iron core, polarities thereof being alternately changed; a cooling airflow channel is formed between each pair of adjacent opposite poles on the rotor iron core; and the cooling airflow channel has an approximately trapezoidal shape on an outer periphery side of the rotor iron core; and extends from an end on a central side in a radial direction of the approximately trapezoidal shape to a radial center.

An electric rotation machine for windmill power generation equipped with a stator slot structure having distributed windings and a rotor pole structure having permanent magnets, wherein the number of slots per pole per phase (Nspp) is undividable by 3 times P (where P is the number of poles), and pole width rate Pw obtained by dividing pole piece width Tp by pole pitch Tr at the outermost diameters of the adjoining poles of the rotor is satisfied any of Pw&#x2266;0.6, 0.67&#x2266;Pw&#x2266;0.71, and 0.78&#x2266;Pw. The distortion factors of induced voltages in a permanent magnet type electrical rotation machine, particularly for windmill power generation, can be reduced.

Electrical rotation machine and a wind turbine system

A permanent magnet type electric rotating machine comprises a stator having a distributed winding and a permanent magnet rotor, wherein the permanent magnet rotor is provided with a wind passage in an axial direction thereof.

Permanent magnet type electric rotating machine and wind turbine electric power generation system

A rotor conductor upper portion positioned near to an outer periphery of a rotor has a trapezoidal, cross sectional shape, a rotor conductor lower portion positioned nearer to a center of the rotor than the rotor conductor upper portion has a rectangular, cross sectional shape, and the rotor conductor upper portion has a height h=27 mm or more in the case where rotor conductors are made of brass, and a height h=7 mm or more in the case where the rotor conductors are made of copper.

Rotating electrical machine and drive system of cage induction motor

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Hitachi, Japan

Tetsuo Fujigaki