Abstract Conventionally, coil units for the stator of a dynamo-electric machine comprise a plurality of individual, shaped and preinsulated conductors and which are wound with layers of insulating tape and then installed in the stator slots. The complete unit consisting of the laminated stator iron and the coils is then impregnated with synthetic resin that is then cured to a hardened state. To facilitate coil repair and or replacement, separation zones are established in the overhanging coil heads by applying a non-adhesive separation medium, preferably a silicon resin, to the individual insulated conductors and the coil insulation applied thereto prior to installation of the coils in the stator and their final impregnation with the to be hardened resin. The non-adhesive silicon resin blocks out the impregnating resin at these zones and thus prevents the individual conductors as well as the one or more layers of coil insulation from being glued to each other.
IN THE METHOD OF THE MANUFACTURE AND INSTALLATION OF CURRENT-CARRYING COIL UNITS UTILIZED IN THE CONSTRUCTION OF DYNAMO-ELECTRIC MACHINES HAVING MAGNETIC CORES WITH SLOTS THEREIN THE STEPS WHICH COMPRISES: A. FORMING THE COIL UNITS AND SHAPING THEM TO A DESIRED CONFIGURATION, WHICH INCLUDES A SLOT-RECEIVING PORTION AND A COIL HEAD AT EACH END OF SAID SLOT RECEIVING PORTION, FROM A PLURALITY OF INDIVIDUALS PRE-INSULATED CONDUCTORS, B. APPLYING A NON-ADHESIVE SEPARATION MEDIUM TO THE INSULATED CONDUCTORS OF THE COIL UNITS AT A PREDETERMINED ZONE IN EACH OF THE COIL HEADS, SAID PREDETERMINED ZONES EACH COMPRISING A RELATIVELY SMALL PORTION OF THE COIL HEADS IN ORDER TO FORM DESIRED SEPARATION ZONES, C. WRAPPING THE ENTIRE COIL WITH ONE OR MORE LAYERS OF AN IMPREGNATABLE MICA-CONTAINING INSULATION TAPE, D. IMPREGNATING THE MICA-CONTAINING INSULATING TAPE WITH THE NON-ADHESIVE SEPARATION MEDIUM AT SAID PREDETERMINED ZONES IN THE COIL HEADS, E. INSTALLING THE COILS IN THEIR RESPECTIVE SLOTS IN THE MACHINE COMPONENT SUCH THAT THE COIL HEADS EXTEND BEYOND AND THUS OVERHANG THE ENDS OF THE SLOTS, AND F. FINALLY IMPREGNATING THE MACHINE COMPONENT TOGETHER WITH THE ENTIRE COILS INSTALLED THEREIN WITH A CURABLE SYNTHETIC RESIN AND WHICH IS THEREAFTER CURED TO ITS FINAL HARDENED STATE, SAID CURABLE SYNTHETIC RESIN HOWEVER BEING BLOCKED OUT OF THE SEPARATION ZONES BY THE NONADHESIVE SEPARATION MEDIUM APPLIED THERETO THEREBY FACILITATING FUTURE OPENING UP OF THE COIL AT THE SEPARATION ZONES AND SEPARATION OF THE INSULATED CONDUCTORS FOR PURPOSE OF COIL REPAIR.
Claim 2
Dependent Claim
34 words
The method as defined in claim 1 for the manufacture and installation of current-carrying coil units in a dynamo-electric machine wherein the separation zones are located at the extreme end of each coil head.
Claim 3
Dependent Claim
30 words
The method as defined in claim 1 for the manufacture and installation of current-carrying coil units on a dynamo-electric machine wherein an elastic insulation is applied to the separation zones.
Claim 4
Dependent Claim
36 words
The method as defined in claim 1 for the manufacture and installation of current-carrying coil units in a dynamo-electric machine wherein the non-adhesive separation medium is color-coded so as to facilitate location of the separation zone.
Claim 5
Dependent Claim
32 words
The method as defined in claim 1 for the manufacture of current-carrying coil units in a dynamo-electric machine wherein the separation zones are color-coded to facilitate location thereof in the coil head.