Mitsubishi Electric Corporation

Mitsubishi Denki Kabushiki Kaisha

Makoto Tsukiji

Takahiro Mabuchi

Shigeyuki Yamamoto

Takashi Fujiwara

Shin Sekiya

Manabu Yoshimura

Hiroki Shiota

Yoshinori Shirafuji

Noboru Masuda

Takahiro Umemoto

Hideto Nakao

Shiro Takada

Shinsuke Miki

Yasutomo Otake

Takeshi Izawa

Xiaohong Yin

Hideki Takigawa

Nobuo Urakawa

Takashi Nada

Keisaku Ishihara

Wataru Bitou

Tsubasa Mori

An object is to provide a stator coil having a corner portion with less start points for partial discharge while reducing loss. A stator coil having a conductor bar includes, at a corner portion thereof: a first insulating layer covering an outer periphery of the conductor bar; an electric conductor having one end electrically connected to the conductor bar on a distal end side of the corner portion, and another end placed on an outer surface of the first insulating layer; a first conductive layer covering an outer periphery of the first insulating layer and the electric conductor located on the outer surface of the first insulating layer; a second insulating layer covering an outer periphery of the first conductive layer; and a second conductive layer covering an outer periphery of the second insulating layer.

Stator coil and stator comprising said stator coil, rotating electrical machine, and manufacturing method for stator coil

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 stator coil accommodated in a slot of a rotary electric machine includes a coil conductor, a main insulating layer, a low resistance corona shield layer, and a stator coil extending outside the slot is provided with a first stator coil at the end of the low resistance corona shield layer has a first nonlinear resistance layer and a second nonlinear resistance layer partially overlapping with an end of the first nonlinear resistance layer, and a lower limit value of an electric resistivity of the second nonlinear resistance layer in a predetermined electric field is larger than an upper limit value of an electric resistivity of the first nonlinear resistance layer by one order of magnitude or more.

Rotary 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

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

A refrigerant-circulating system which comprises a refrigeration cycle comprising a refrigerant compressor, a condenser, an expansion mechanism and an evaporator to form a refrigerant circuit and employing a refrigerant which contains no chlorine, wherein an aromatic polyether oil having as a base oil structure a benzene ring having an ether bond is employed as a refrigerator oil.

Refrigerant-circulating system, and refrigerant compressor and refrigeration cycle employing the refrigerant compressor

Stator coil for rotary electric machine

Growing community of inventors

Tokyo, Japan

Makoto Tsukiji