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Electromagnetic induction apparatus with cooling grooves

  • US 4,588,972 A
  • Filed: 12/13/1984
  • Issued: 05/13/1986
  • Est. Priority Date: 12/23/1983
  • Status: Expired due to Term
First Claim
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1. An electromagnetic induction apparatus cooled with a liquid refrigerant sprinkled thereon which apparatus comprises an iron core, a vertically disposed winding assembly magnetically coupled to said iron core and including a plurality of serially adjacent pancake coils each formed in a vertical plane of a rectangular electrically conductive wire wound around said iron core, and a plurality of electrically insulating bases interposed between adjacent ones of said plurality of pancake coils, each of said electrically insulating bases being provided on a surface thereof contacted by an associated one of said pancake coils with a plurality of cooling grooves extending from an upper central portion of said pancake coils to a lower central portion of said pancake coils along vertical side portions and upper and lower curved portions of said turns of said wire in parallel, spaced relationship along and in contact with turns of said electrically conductive wire so as not to cross over said turns and so as to define lands between said cooling grooves contacting said pancake coils, each of said p1urality of cooling grooves being narrower than the width of said wire and having one end opening on an upper central portion of said electrically insulating base and an opposite end opening on a lower central portion thereof so that said open ends of said plurality of cooling grooves on each of said upper and lower central portions of said electrically insulating base are symmetrically located on opposite sides of a vertically extending longitudinal central axis of said base, and a refrigerant sprinkler disposed above said winding assembly and said iron core to sprinkle said liquid refrigerant on both said winding assembly and said iron core to flow in said plurality of cooling grooves, wherein each of said electrically insulating bases is further provided on the surface of the upper and lower central portions thereof, including said open ends of said cooling groove, with a plurality of inflow and exit grooves disposed in spaced relationship and in parallel to said longitudinal axis on each side of the longitudinal axis symmetrically with respect to said longitudinal axis, said plurality of inflow and exit grooves providing adjacent ones of said open ends of said cooling grooves with communication with an outer periphery of said pancake coil.

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