US 12,278,026 B2
Magnet wire with thermoplastic insulation
Matthew E. Leach, Fort Wayne, IN (US); Mohammad Mazhar Said, South Barrington, IL (US); Guadalupe Arambula, Fort Wayne, IN (US); and Zhiyang Zhao, Fort Wayne, IN (US)
Assigned to ESSEX SOLUTIONS USA LLC, Atlanta, GA (US)
Filed by Essex Furukawa Magnet Wire USA LLC, Atlanta, GA (US)
Filed on May 15, 2023, as Appl. No. 18/197,199.
Application 18/197,199 is a continuation of application No. 17/396,173, filed on Aug. 6, 2021, granted, now 11,688,527.
Claims priority of provisional application 63/062,501, filed on Aug. 7, 2020.
Prior Publication US 2023/0290539 A1, Sep. 14, 2023
Int. Cl. H01B 13/14 (2006.01); H01B 7/02 (2006.01); H01B 13/06 (2006.01); H01B 3/42 (2006.01)
CPC H01B 7/0275 (2013.01) [H01B 13/065 (2013.01); H01B 13/141 (2013.01); H01B 13/148 (2013.01); H01B 3/421 (2013.01); H01B 3/427 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method for forming insulated magnet wire, the method comprising:
providing a conductor; and
forming extruded insulation around the conductor, wherein forming extruded insulation comprises:
co-extruding both a first layer of thermoplastic insulation and a second layer of thermoplastic insulation around the conductor, the second layer formed around the first layer and in contact with an entire outer periphery of the first layer,
wherein the first layer comprises a first polymeric material having a first thermal index, and comprising at least one of polyester, nylon, polyphenylene sulfide, or polyphenylsulfone, the first layer comprising at least fifty-five percent of a thickness of the extruded insultation; and the second layer comprises a second polymeric material having a second thermal index higher than the first thermal index and comprising at least one of polyetheretherketone, polyaryletherketone, or polyetherketoneketone, and
wherein the extruded insulation has a partial discharge inception voltage of at least 1200 volts.