Abstract: Two sets of a combination of an iron core formed of laminated strip-shaped electromagnetic steel plates and a coil are arranged in parallel, and these are abutted via core gap spacers against two iron cores formed of laminated trapezoidal electromagnetic steel plates, so that a square-shaped magnetic path is formed. Two outside iron cores of the four iron cores are coupled and fixed with metal fittings. With such an arrangement, the coil is divided into two, with increased surface areas of the coils and therefore an improved cooling characteristic. Further, since the electromagnetic steel plates used for the iron cores can be formed into simple shapes, electromagnetic steel plates of various sizes can be easily manufactured, so that iron cores of optimum dimensions can be provided, optionally depending on the type of the reactor.

Abstract: Two sets of a combination of an iron core formed of laminated strip-shaped electromagnetic steel plates and a coil are arranged in parallel, and these are abutted via core gap spacers against two iron cores formed of laminated trapezoidal electromagnetic steel plates, so that a square-shaped magnetic path is formed. Two outside iron cores of the four iron cores are coupled and fixed with metal fittings. With such an arrangement, the coil is divided into two, with increased surface areas of the coils and therefore an improved cooling characteristic. Further, since the electromagnetic steel plates used for the iron cores can be formed into simple shapes, electromagnetic steel plates of various sizes can be easily manufactured, so that iron cores of optimum dimensions can be provided, optionally depending on the type of the reactor.

Abstract: A first insulation layer (3), a first conductive layer (1), a second insulation layer (4) and a second conductive layer (2) are laminated, and a larger spacial gap between either one (2) of the first conductive layer (1) and the second conductive layer (2) and the opposite layer (3,4) thereto (2) than that between the other conductive layer (1) and the opposite layer (3,4) thereto (1) is made, and high voltage is applied across both conductive layers (1,2), and when charged dusts pass therethrough, the charged dusts are attached on only one (2) of the conductive layer. These charged dusts are electrically neutralized, and thereby, it becomes possible to prevent weakening of the electric field and declination of the dust-collecting ratio through lapse of time.