Hitachi, Ltd.

Hitachi Automotive Systems, Ltd.

Hitachi Astemo Ltd.

Toshio Ishikawa

Tokio Yamagiwa

Fumihiro Endo

Jun Ozawa

Tomoaki Utsumi

Yoshihisa Ishikawa

Minoru Yabuki

Masahiko Honma

Yuzuru Kamata

Mitsuaki Izumi

Yosuke Umesaki

Shuzo Iwaasa

Yuji Enomoto

Yasuyuki Saito

Hiromitsu Okamoto

Yuji Kanoh

Kazuo Tahara

Yukio Kurosawa

Shinji Yamazaki

Hiroshi Kanazawa

Tomohiro Fukuda

Yoshimi Mori

Shigeo Shiono

Yasuhiko Kimura

Tsuyoshi Harada

Yoshinori Tagawa

Masao Hosokawa

Masaoki Tamura

Kunihiro Ohsawa

Naoyuki Taguchi

Kaoru Endo

A rotary electric machine includes a rotor, a stator, and stator windings. The stator winding has a plurality of slot conductor groups having a plurality of slot conductors of the same phase. A plurality of slot conductors of the slot conductor group are inserted into a predetermined number (Ns) of slots continuously arranged in a circumferential direction of the stator core such that the slot and the layer are adjacent to each other. The predetermined number (Ns) is set to 'Ns=NSPP+1,' where 'NSPP' denotes the number of slots per pole per phase.

Rotary electric machine and vehicle provided with the same

The productivity of a rotary electric machine worsens because the axial length of a stator increases, increasing the overall size, and connecting parts are located on both end sides of a stator core. The rotary electric machine includes: a stator core; a stator winding including a plurality of segment coils; and a connection board that fixes a different-phase connection conductor adapted to connect different phases of the segment coils of the stator winding and a same-phase connection conductor adapted to connect the segment coils of the same phase of the stator winding. The stator winding has, on one side with respect to an axial direction of the stator core, a coil connection section where end portions of the plurality of segment coils are connected to each other, and the connection board is disposed on a side on which the coil connection section is disposed, with respect to the stator core.

Rotary electric machine

Provided is a high-torque low-noise rotary electric machine. In a rotary electric machine, a jumper conductor having a normal slot pitch connects slot conductors by striding slots with a slot pitch 'Np=N(=6)' in one of coil ends and striding slots with a slot pitch 'Np=N(=6)' in the other coil end, assuming that the number of slots per pole is set to &#x201c;N(=6).&#x201d; The jumper conductor having an irregular slot pitch connects the slot conductors by striding slots with a slot pitch &#x201c;Np=N+1(=7)&#x201d; in one of the coil ends and striding slots with a slot pitch &#x201c;Np=N&#x2212;1(=5)&#x201d; in the other coil end, assuming that the number of slots per pole is set to &#x201c;N(=6).&#x201d; The stator winding has a plurality of slot conductor groups consisting of a plurality of slot conductors having the same phase.

Provided is a rotating electrical machine including a housing in which a flow passage of cooling liquid can be easily formed and airtightness and productivity are high. A rotating electrical machine is configured to include a housing which is provided with a part of a flow passage of cooling liquid, a stator which is disposed on an inner circumferential side of the housing and includes a stator winding, and a rotor which is rotatably supported to an inner circumferential side of the stator with a gap between the stator and the rotor and the flow passage of the cooling liquid includes an annular groove having an open surface on at least one side of an axial direction of the housing and a plate provided to cover the open surface. Preferably, the housing and the plate are configured to be joined by welding or an adhesive material. In addition, roughening processing or chemical processing may be performed on parts of the housing and the plate and the housing and the plate may be configured to be joined by a resin.

Rotating electrical machine having means to secure plating to cover a flow passage

A permanent magnet rotating electric machine includes a stator and a rotor disposed with an air gap interposed between the stator and the rotor. The rotor is provided with a rotor core provided with a plurality of magnet insertion holes in a circumferential direction, and a press-fit body pressed into each of the magnet insertion holes. The press-fit body includes a permanent magnet and a magnet fixing member provided on the sides of the permanent magnet. The press-fit body is fixed within the magnet insertion hole in such a way that, in the circumferential direction, one end of the press-fit body makes a line contact with the inner wall of the magnet insertion hole through a line contact portion of the magnet fixing member and the other end thereof makes a surface contact with the inner wall of the magnet insertion holes through a surface contact portion of the magnet fixing member.

Permanent magnet rotating electric machine and method for manufacturing same

To provide a high-quality, high-output, and low-cost automotive alternator by suppressing heat generation through the reduction of current loss in a heat dissipating plate of a rectifier without expanding a space for placing the heat dissipating plate and reducing the cooling performance of the heat dissipating plate. An automotive alternator includes a rectifier, wherein the rectifier is configured such that a heat dissipating plate of positive pole to which the rectifier element of positive pole is mounted is disposed opposite to a heat dissipating plate of negative pole to which a plurality of rectifier elements of negative pole are mounted; wherein the heat dissipating plate of positive pole is made up of a first heat dissipating plate and a second heat dissipating plate, which are made of two different materials.

Automotive alternator having a heat dissipating plate

A vehicle AC generator includes a stator having stator windings; front frame and rear frame, each rotatably supporting a rotor; a cooling fan fitted to the rotor; first polarity arm and second polarity arm configured to rectify currents of one polarity and another polarity, respectively; a rectifier device configured to rectify an alternating current generated in the stator windings; and a protective cover covering the rectifier device. The rectifier device includes a first heat dissipating plate having rectifier elements forming the first polarity arm, a second heat dissipating plate rectifier elements forming the second polarity arm, and a connection plate formed in waveform-like shape and disposed between the first and second heat dissipating plates, and a passage of a cooling air blown by the cooling fan formed between the first and second heat dissipating plates and between the second heat dissipating plate and the connection plate.

Vehicle AC generator

An object is to provide a rotating electric machine offering a high output and high efficiency by balancing inductance of each phase even if a stator is used in which stator windings of different phases are disposed in a slot of a stator core in a three-phase winding. A statorincludes a stator corehaving a plurality of slots arrayed circumferentially and opening to an inner peripheral surface and a stator windingwound in each of the slots. The stator windingis divided into at least two for each phase (U-A,U-B,V-A,V-B,W-A,W-B). After insertion of the stator core, the stator winding of each phase is connected in parallel or in series. The stator winding of each phase is disposed in slots such that combined inductance of different phases is equalized.

Stator winding for rotating electric machine

A direction in which cooling air generated by a cooling fan flows to be discharged is perpendicular or nearly perpendicular to a direction in which diffusers are inclined. Thus, airflow resistance is increased by the diffusers, and the cooling air cannot be efficiently discharged from discharge ports provided circumferentially in an outer peripheral portion of a housing. Further, a stator coil cannot be sufficiently cooled. An electrical rotating machine includes: a rotor having a cooling fan on an end face of the rotor; a stator that is arranged opposite the rotor and has a stator coil with a rotation clearance provided between the stator and the rotor; a housing that holds the rotor and the stator; a plurality of intake ports that are provided in a side wall portion of the housing; a plurality of discharge ports that are provided circumferentially in an outer peripheral portion of the housing; and a plurality of diffusers that are provided circumferentially on an inner wall surface of a corner portion of the housing, the diffusers inclining toward the side opposite to a rotational direction of the rotor.

Electrical rotating machine

An alternator for vehicle includes a stator that outputs an AC voltage and a rotor that includes a field coil and a rotor core. The stator includes a plurality of phase stators that are disposed side-by-side along the rotational axis and individually output AC voltages. The phase stators include an even number of stator tabs alternately extending from one outer side of a phase stator coil toward another outer side of the phase stator coil and extending from the other outer side toward the one outer side along the rotational axis. The rotor includes a field coil and a rotor core at which an even number of rotor tabs are formed along the circumferential direction so as to alternately extend from one outer side of the field coil toward another outer side of the field coil along the rotational axis and extend from the other outer side toward the one outer side along the rotational axis. A phase stator core at each phase stator is formed by laminating a plurality of magnetic sheets.

Alternator for vehicle and rotating electrical machine

Stator claw poles are disposed at a stator core at a position facing opposite a rotor so as to alternately range from the two sides along the axial direction. With a plurality of magnetic poles thus formed, the distance by which the gap between the front end portions of the stator claw poles and the stator outer circumference ranges is increased, which, in turn, reduces the reactance guided to a stator coil. It is ensured that the magnetic reluctance manifesting between the front end portions of the stator claw poles and an enclosing member that holds the stator core, facing opposite the centers of the claw poles along the circumferential direction, is greater than the magnetic reluctance manifesting between the front portions and the stator core enclosing member facing opposite the front end portions.

Rotating electrical machine

It is an object of the present invention to make it possible to easily wind a stator winding, enhance an occupied ratio in a stator core, reduce a winding resistance because there is no coil end, and change a field magnetic flux in accordance with a use. Stator pawl magnetic poles of a stator core extend from both sides in an axial direction alternately at locations opposed to a rotor to form a plurality of magnetic poles. With this stator core, it is only necessary to annularly wind a stator winding. Therefore, it is possible to enhance operability and an occupied ratio, and since there is no coil end, it is possible to reduce winding resistance. Since the rotor is a Randall type rotor having a field winding and a rotor pawl magnetic pole, it is possible to change the field magnetic flux in accordance with a use.

In a gas insulated electric apparatus having gas sections filled with insulating gas, a locating device determines a position of a gas section in which an insulation abnormality is detected, on the basis of a detection signal from sensors disposed in each of predetermined gas sections. At the same time a hindering degree diagnosing device diagnoses the degree and the kind of the insulation abnormality, by comparing a detection signal from the sensors with data stored in a data base. A valve control generates a valve control signal, responding to the locating device and the hindering degree diagnosing device, and in response to the valve control signal, a trip circuit generates a valve opening signal to open an electromagnetic valve disposed in a gas section in which an insulation abnormality is detected. An insulating gas injecting and evacuating device injects an insulating gas, different from the initial insulating gas with which the gas sections are filled beforehand, into the gas section for which the electromagnetic valve has been opened by the valve opening signal, or evacuates a predetermined amount of the insulating gas with which the gas sections are filled beforehand, so as to increase insulation strength.

Gas insulated electric apparatus

A gas insulated switchgear has a container which is filled with an insulating gas, a conductor disposed with the container, an insulator for supporting the conductor. An outer periphery of the insulator is made smooth so as to improve a dielectric strength of the device. The insulator is made of an organic substance base and an inorganic material filler added to the base. In order to improve the dielectric strength, the filler is atomised or the insulator is coated.

Gas insulated switchgear

A gas isolated disconnecting switch is provided which performs a sufficient restriking surge suppressing function, induces no adverse effect on the operation of a circuit breaker disposed within the system and always enables the circuit breaker to surely interrupt a fault current. Under the closed condition of the gas isolated disconnecting switch, a main stationary member 6 engages with a main movable member 16 and an auxiliary movable member 17 with an auxiliary stationary member 8 respectively. Accordingly the portion of an auxiliary conductor 7 which passes through a cylindrical magnetic body 9 is short-circuited via the main stationary member 6 and the main movable member 16, and no influence is induced on the operation of the circuit breaker disposed in the system. During the opening operation of the disconnecting switch, the auxiliary movable member 17 disengages with a time delay. At this moment, the current flows through the portion of the auxiliary conductor 7 which passes through the cylindrical magnetic body 9 to thereby perform a sufficient restriking surge suppressing function.

Growing community of inventors

Hitachinaka, Japan

Toshio Ishikawa