Mitsubishi Electric Corporation

Takahiro Mabuchi

Naoki Yasuda

Shigeyuki Yamamoto

Kazuki Kubo

Makoto Tsukiji

Yuhei Awano

Sohei Samejima

Hiroshi Sako

Hajime Takeya

Michihito Matsumoto

Xiaohong Yin

Hiroki Kobayashi

Motoki Masaki

Shinya Tokizaki

Satoru Sato

Tomohiro Kojiya

Azusa Osawa

Takumi Yasuda

Tsubasa Mori

Masahiro Yoshioka

Provided is a semiconductive tape in which semiconductive resin layers in which metal particles are dispersedly mixed are disposed on a fibrous insulation substrate, wherein the metal particles have a melting point higher than the curing temperature of the thermosetting resin to be subjected to an impregnation treatment and lower than the softening point of the fibrous insulation substrate. The semiconductive tape is used for the stator coil of a rotating electric machine to suppress erosion of the thermosetting resin, impairment of semiconductivity thereof, and the like caused by heat generation, discharges and the like during operation of the rotating electric machine, thus exhibiting corona resistance stably over an extended period of time.

Semiconductive member, stator coil, and rotating electric machine

Provided is an insulating varnish composition, including: two or more kinds of epoxy resins; and a filler having an average primary particle diameter of 500 nm or less, wherein the two or more kinds of epoxy resins contain 80 mass % or more of an epoxy resin having a number of repetitions of 0 in a molecular structural formula thereof with respect to a total mass of the two or more kinds of epoxy resins.

Insulating varnish composition, rotating machine coil and rotating machine

Provided is a stator coil, including: a coil conductor; a first insulating layer in which a first mica tape is wound and laminated around an outer periphery of the coil conductor; and a second insulating layer in which a second mica tape is wound and laminated around an outer periphery of the first insulating layer, wherein the first mica tape contains mica in a specific content, wherein 60 mass % or more of the mica contained in the first mica tape passes through a JIS standard sieve having a nominal opening of 250 μm, wherein the first mica tape has a specific lamination thickness, and wherein 40 mass % or less of mica contained in the second mica tape passes through the JIS standard sieve having a nominal opening of 250 μm.

Stator coil, method of manufacturing the same, and rotating electric machine

A thermosetting resin composition of the present disclosure includes an epoxy resin () containing a curing agent, and inorganic particles () having a rutile-type crystal structure and an average particle diameter of 500 nm or less. Further, a stator coil of the present disclosure includes a coil conductor (), and an insulating layer () obtained by winding an insulating tape around the coil conductor (), impregnating the insulating tape with the thermosetting resin composition, and molding the impregnated insulating tape by heating and pressurizing. In addition, a rotating electric machine of the present disclosure includes a stator core () having a slot (), in which the stator coil () is accommodated. According to the present disclosure, it is possible to obtain a thermosetting resin composition capable of achieving improvement in machine life through suppression of partial discharge and miniaturization and high output of the machine through improvement of a dielectric-breakdown electric field property, a stator coil obtained through use of the thermosetting resin composition, and a rotating electric machine.

Thermosetting resin composition, stator coil obtained using same, and rotating electric machine

An insulating tape having a mica layer, a reinforcing layer having a filler and a fiber reinforcing material laminated on the mica layer, and a cellulose derivative layer laminated on the reinforcing layer is provided. One or more hydroxyl groups in the glucose units of the cellulose derivative are substituted with a functional group such as &#x2014;CHCHOH or &#x2014;(CHCHO)H (where p is any repeating number up to 50). The weight per unit area of the mica ranges from 100 g/mto 200 g/m. The filler has a maximum particle size of 100 &#x3bc;m or smaller and a weight per unit area ranging from 10 g/mto 50 g/m. The insulating tape is useful to form a stator coil insulating layer with high thermal conductivity, with no outflow of a filler to the exterior during production of the stator coil, and with enhanced bonding strength.

Insulating tape and production method thereof, stator coil and production method thereof, and rotating electric machine

A method for producing a preform for manufacture of a fiber-reinforced plastic molding. The method includes: fixing a resin-equipped film rolled out from a roll state including a release film and a fixing resin and containing a partially-cured thermosetting resin, to a surface of the dry fiber fabric rolled out from a roll with the fixing resin interposed therebetween, thereby obtaining a first dry fiber fabric; separately fixing the resin-equipped film to a surface of the dry fiber fabric rolled out from a roll with the fixing resin interposed therebetween, and detaching the release film, thereby obtaining one or more second dry fiber fabrics; and laminating the second dry fiber fabrics on a surface of the first dry fiber fabric with the fixing resin of the second dry fiber fabrics interposed therebetween.

Method for producing preform and method for producing fiber-reinforced plastic molding

An insulating tape including: a mica layer containing mica; a reinforcing layer that is laminated onto the mica layer and contains a filler and a fibrous reinforcing material; and a flat sheet layer that is laminated onto the reinforcing layer and contains flat sheet-shaped inorganic particles having an aspect ratio of at least 30. In this insulating tape, the filler is supported in advance, and does not therefore flow out during manufacture of a stator coil, for example during hot-pressing. As a result, an insulating coating exhibiting high thermal conductivity can be formed.

Insulating tape, method for producing same, and stator coil

The liquid thermosetting resin composition of the present invention comprises an epoxy resin in which at least one selected from the group consisting of a linear epoxy resin having a degree of polymerization of 2 or more and an epoxy acrylate resin and at least one selected from the group consisting of a novolac-type epoxy resin and a naphthalene-type epoxy compound are linked to each other via an ether linkage, and which has a weight average molecular weight of from 2,000 to 10,000. When the liquid thermosetting resin composition of the present invention is used for insulating a stator coil of a rotating electric machine, mechanical characteristics can be improved without causing a reduction in the heat resistance.

Liquid thermosetting resin composition for insulating stator coil of rotating electric machine

A rotator coil is provided that includes a coil conductor and a mica tape wound a plurality of times around an outer periphery of the coil conductor. The mica tape includes mica paper and a reinforcing member, and has an adhesive resin layer containing an acryloyl-based component and a cyanate ester-based component between the mica paper and the reinforcing members. The reinforcing member, the mica paper, or both, are impregnated with a thermosetting resin composition, and hardened.

Rotator coil and method of manufacturing the same

The present invention is a method for producing a fiber-reinforced plastic molding including, in the following order, the steps of: forming a preform laminate fixed to a molding die by laminating a plurality of preforms each including a dry fiber fabric and a fixing resin, the preforms being laminated through the fixing resin formed on a surface of the dry fiber fabric and including a partially-cured thermosetting resin exhibiting tackiness at a room temperature; impregnating the dry fiber fabric, provided in the preform laminate fixed to the molding die, with a liquid thermosetting resin; curing the liquid thermosetting resin and the fixing resin to form a fiber-reinforced plastic molding; and demolding the fiber-reinforced plastic molding from the molding die.

Growing community of inventors

Chiyoda-ku, Japan

Takahiro Mabuchi