# US 8,569,628 B2 · Insulated wire > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,569,628 B2 - Document ID: US8569628B2 - Status: Granted - Kind: B2 - Application number: 12/870,329 - Filed: 2010-08-27 - Published: 2011-08-11 - Granted: 2013-10-29 - Earliest claimed: 2010-02-10 - Assignees: Hitachi Cable, Ltd.; Hitachi Magnet Wire Corp. - Applicants: Tomiya Abe; Takanori Yamazaki; Kiyoshi Watanabe; Hideyuki Kikuchi; Takahiko Hanada; Daisuke Hino - Inventors: Tomiya Abe; Takanori Yamazaki; Kiyoshi Watanabe; Hideyuki Kikuchi; Takahiko Hanada; Daisuke Hino - Web page: https://patentgrep.com/patent/US8569628B2 ## CPC - H01B 3/301: {Macromolecular compounds obtained by reactions forming a linkage containing sulfur with or without nitrogen, oxygen or carbon in the main chain of the macromolecule, not provided for in group H01B3/302} - H01B 3/305: {Polyamides or polyesteramides} - H01B 3/441: {from alkenes} - H01B 3/445: {from vinylfluorides or other fluoroethylenic compounds} - H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K}) ## Abstract There is provided an insulated wire having an insulation film composed of a plurality of layers provided on a conductor, in which: the insulation film includes a first film layer and a second film layer; the first film layer is made of a first resin composition formed by graft-polymerizing a graft compound with an ethylene-tetrafluoroethylene copolymer and is provided on a circumference of the conductor; and the second film layer is made of a second resin composition being a polymer alloy made of a polyphenylene sulfide resin and a polyamide resin, or being a polymer alloy made of a polyether ether ketone resin and a polyamide resin and is provided on a circumference of the first film layer. ## Claims ### Claim 1 An insulated wire to be used for a coil for electrical equipment controlled by an inverter having an insulation film composed of a plurality of layers provided on a conductor, wherein: the plurality of layers comprises a first film layer and a second film layer; the first film layer is made of a first resin composition formed by graft-polymerizing a graft compound with an ethylene-tetrafluoroethylene copolymer and is provided on a circumference of the conductor; the second film layer is made of a second resin composition being a polymer alloy made of a polyether ether ketone resin and a polyamide resin and is provided on a circumference of the first film layer; the storage elastic modulus of the second resin composition is 1 GPa or more at 20° C., and 10 MPa or more at 200° C.; the insulated wire has a partial-discharge start voltage of 1500 V or more and is configured to be used for a coil for electrical equipment controlled by an inverter; and the insulated wire has an adhesion property that, when a five-coil worth length of insulated wire is wound onto a winding rod having a diameter equivalent to a diameter of the conductor, and inspected for abnormalities selected from the group consisting of cracks, flaws, wrinkles and peeling an optical microscope at a magnification of 50, the insulation film does not exhibit any of said abnormalities. ### Claim 2 (depends on 1) The insulated wire according to claim 1, wherein: the graft compound contains a peroxide group or an organic group having an α,β-unsaturated double bond at the terminal end thereof to be working as a graft-polymerization bonding group, and also contains at least one of the functional groups providing adhesion selected from a carboxyl group, carboxylic acid anhydride residue, epoxy group, and hydrolyzable silyl group. ### Claim 3 (depends on 1) The insulated wire according to claim 1, wherein: a thickness of the first film layer is 30 μm or more but not thicker than 300 μm; and a thickness of the second film layer is 20 μm or more but not thicker than 300 μm. ### Claim 4 (depends on 1) The insulated wire according to claim 1, wherein the insulated wire has a wear resistance property such that a number of reciprocations of a sensing pin perpendicularly applied to a surface of the insulation film under a load of 5.9 N until an electric current begins to flow between the sensing pin and an electrode connected to the conductor is more that 2000. ### Claim 5 An insulated wire to be used for a coil for electrical equipment controlled by an inverter having an insulation film composed of a plurality of layers provided on a conductor, wherein: the insulation film comprises a first film layer and a second film layer; the first film layer is made of a first resin composition formed by graft-polymerizing a graft compound with an ethylene-tetrafluoroethylene copolymer and is provided on a circumference of the conductor; the second film layer is made of a second resin composition being a polymer alloy made of a polyphenylene sulfide resin and a polyamide resin and is provided on a circumference of the first film layer; the storage elastic modulus of the second resin composition is 1 GPa or more at 20° C., and 10 MPa or more at 200° C.; the insulated wire has a partial-discharge start voltage of 1500 V or more and is configured to be used for a coil for electrical equipment controlled by an inverter; and the insulated wire has an adhesion property that, when a five-coil worth length of insulated wire is wound onto a winding rod having a diameter equivalent to a diameter of the conductor, and inspected for abnormalities selected from the group consisting of cracks, flaws, wrinkles and peeling an optical microscope at a magnification of 50, the insulation film does not exhibit any of said abnormalities. ### Claim 6 (depends on 5) The insulated wire according to claim 5, wherein: the graft compound contains a peroxide group or an organic group having an α,β-unsaturated double bond at a terminal end thereof to be working as a graft-polymerization bonding group, and also contains at least one of the functional groups providing adhesion selected from a carboxyl group, carboxylic acid anhydride residue, epoxy group, and hydrolyzable silyl group. ### Claim 7 (depends on 5) The insulated wire according to claim 5, wherein: a thickness of the first film layer is 30 μm or more but not thicker than 300 μm; and a thickness of the second film layer is 20 μm or more but not thicker than 300 μm. ### Claim 8 (depends on 5) The insulated wire according to claim 5, wherein the insulated wire has a wear resistance property such that a number of reciprocations of a sensing pin perpendicularly applied to a surface of the insulation film under a load of 5.9 N until an electric current begins to flow between the sensing pin and an electrode connected to the conductor is more that 2000.