A.c. printed-circuit winding

Claim 1

A FIELD WINDING FOR THE STATOR OF AN ALTERNATING CURRENT ROTARY MACHINE OF THE FLAT ANNULAR AIRGAP KIND, COMPRISING TWO SETS OF IDENTICALLY SHAPED HALF-TURN PRINTEDCIRCUIT CONDUCTORS ADHERING TO THE OPPOSITE FACES OF AN ANNULAR INSULATING CARRIER, EACH CONDUCTOR COMPRISING A SUBSTANTIALLY RADIAL MID-PORTION HAVING ARCUATE END-PORTIONS EXTENDING FROM OPPOSITE ENDS THEREOF TO THE INNER AND OUTER PERIPHERAL EDGES OF SAID CARRIERS, INTERFACE CONNECTIONS EXTENDING BETWEEN REGISTERING ENDS OF SAID CONDUCTORS ON OPPOSITE FACES OF SAID CARRIER, THE INNER ENDPORTIONS OF SAID CONDUCTORS ON EACH FACE OF SAID CARRIER BEING FORMED AS CONTIGUOUS CONDUCTOR PORTIONS SPACED APART BY NARROW AIR-GAPS, THE MIDDLE PORTIONS OF SAID CONDUCTORS BEING FORMED IN GROUPS OF CONTIGUOUS CONDUCTORS, THE GROUPS BEING CONNECTED IN PAIRS EQUAL IN NUMBER TO THE ELEMENTARY PHASES IN THE ELECTRICAL SUPPLY TO BE APPLIED TO THE WINDINGS, THE SAID GROUPS OF MIDDLE PORTIONS BEING SPACED APART BY BARE AREAS OF SAID CARRIER, AND SAID MIDDLE CONDUCTOR PORTIONS, TAKEN TOGETHER ON BOTH FACES OF SAID CARRIER, COVERING SUBSTANTIALLY THE COMPLETE MIDDLE ANNULAR AREA OF SAID CARRIER, AND SAID OUTER END-PORTIONS OF SAID CONDUCTORS BEING ARRANGED IN GROUPS OF CONTIGUOUS CONDUCTOR PORTIONS ACCORDING TO THE GROUPING OF SAID MIDDLE CONDUCTOR PORTIONS, SAID GROUPS OF OUTER END-PORTIONS BEING SEPARATED BY BARE AREAS OF SAID CARRIER.