Encapsulated electrical members and method of making the same

Claim 1

AN INSULATION AND PROTECTION SYSTEM FOR AN ELECTRICAL MEMBER FOR A DYNAMOELECTRIC MACHINE OF THE TYPE INCLUDING A MAGNETIC CORE HAVING COIL RECEIVING SLOTS THEREIN AND COILS DISPOSED IN SAID SLOTS HAVING END TURNS PLACED IN OVERLAPPED RELATIONSHIP AND EXTENDING EXTERIORLY OF SAID CORE; MEANS PROVIDING GROUND INSULATION BETWEEN SAID COILS AND SAID SLOTS; A LAYER OF ELECTRICALLY INSULATING SHEET MATERIAL DISPOSED WITHIN THE OVERLAPPED END TURNS AND EXTENDING AROUND THE CIRCUMFERENCE THEREOF TO PROVIDE TOP-TO-BOTTOM INSULATION FOR SAID END TURNS; THE IMPROVEMENT COMPRISING: SEPARATE SLEEVES OF ELECTRICALLY INSULATING MATERIAL COVERING THE END TURNS OF AT LEAST THE COILS HAVING A PHASE-TO-PHASE RELATIONSHIP TO PROVIDE ELECTRICAL INSULATION THEREBETWEEN; AND A PROTECTIVE ENVELOPE OF A DENSE, HOMOGENEOUS MASS OF CURED THERMOSETTING RESINOUS DIELECTRIC COMPOSITION INTIMATELY BONDED TO THE EXTENDING END TURNS AND THE REGIONS ADJACENT THERETO.