Hitachi, Ltd.

Minoru Yabuki

Junzo Kida

Keiichi Tsuzura

Toshio Ishikawa

Yoshihisa Ishikawa

Yuji Enomoto

Yasuhito Watanabe

Kazuo Tahara

Hiroshi Kanazawa

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.

A compact-sized gas insulated switchgear accommodates components and devices constituting its line side unit into one container. Arresters and cable heads are accommodated in a lower section of the line side unit, and a circle connecting centers of respective arresters and cable heads arranged therein is concentric with a cylindrical section of the line side unit container.

Gas insulated switchgear

A gas insulated switchgear of the present invention, a plurality of disconnect switches are provided on a line connecting a bus line to a circuit-breaker in such a manner as to be arranged in both a main bus unit, a breaker unit or in both a first and second insulating gas sections. Accordingly, when an inconvenience occurs in the gas insulated switchgear apparatus and the exchange work of a unit is required, it is possible to exchange the inconvenient damaged unit only by turning the circuit including the inconvenient damaged unit into power supply interruption, that is, without turning a normal circuit unit into power supply interruption.

Gas insulated switchgear apparatus

A gas insulated switchgear includes a bus unit, a breaker unit and a line side unit. An insulating spacer structure attaching at least two of the units together includes an inner flange on a first unit, an outer flange on a second unit, and an insulating spacer positioned between the first and second units. Closed end tapped holes are formed in the inner flange and idle holes are formed in the outer flange, and tapped holes with a larger diameter than that of the tapped holes of the inner flange are formed in the insulating spacer.

Gas insulated switchgear with flange-spacer assembly

A gas insulated switching apparatus has lightning arrestors in a line side unit. Each lightning arrestor is mounted to be moved linearly into and out of connection with a corresponding conductor. Specifically, the cover which supports the lightning arrestor is disposed beneath the bottom plate of the vessel of the line side unit. The lightning arrestors are connected to a monitor of an operating device beneath the line side unit. Since the lower portion of the lightning arrestors are connected to the monitor, the length of the connection lines is made sufficiently short.

Gas insulated switching apparatus

A gas insulated switch gear has a main bus unit, a circuit breaker unit and a line unit. The line unit has a top plate with a hole through which a potential transformer is inserted into the inside of the line unit and an adapter cover fixed to the potential transformer is connected to the top plate.

Growing community of inventors

Naka-gun, Japan

Minoru Yabuki