Method for producing the coil of a rotary electric machine stator and stator thus obtained

A stator for an electrical machine having an axis (A), comprising:

• a) a plurality of axially extending slots;
• b) within every slot of a subset of the slots, at least four sections of conductor, arranged so that
• i) a first section of conductor and a second section of conductor are both located at a first radial distance from the axis (A);
• ii) a third section of conductor and a fourth section of conductor are both located at a second radial distance from the axis (A);
• c) a plurality of connecting sections which
• i) connect all first sections of conductor in electrical series with each other to form a first continuous winding;
• ii) connect all second sections of conductor in electrical series with each other to form a second continuous winding;
• iii) connect all third sections of conductor in electrical series with each other to form a third continuous winding which is electrical series with the first sections of conductor;
• and
• iv) connect all fourth sections of conductor in electrical series with each other to form a fourth continuous winding which is in electrical series with the second sections of conductor;
• in which
• d) a pair of electrical conductors reverses direction at a first slot, and runs through the same slots in the same sequence as a first layer to form a third layer, such that all members of said pair of electrical conductors, in the slots, in the third layer are located at the same radial distance D3 from the axis.

A stator for an electrical machine having an axis (A), comprising:

• a) a plurality of axially extending slots:
• b) within every slot of a subset of the slots, at least four sections of conductor, arranged so that
• i) a first section of conductor and a second section of conductor are both located at a first radial distance from the axis (A);
• ii) a third section of conductor and a fourth section of conductor are both located at a second radial distance from the axis (A);
• c) a plurality of connecting sections which
• i) connect all first sections of conductor in electrical series with each other to form a first continuous winding;
• ii) connect all second sections of conductor in electrical series with each other to form a second continuous winding;
• iii) connect all third sections of conductor in electrical series with each other to form a third continuous winding which is electrical series with the first sections of conductor;
• and
• iv) connect all fourth sections of conductor in electrical series with each other to form a fourth continuous winding which is in electrical series with the second sections of conductor;
• in which
• d) a pair of electrical conductors reverses direction at an Nth slot, and runs through the same slots in the same sequence as a second layer to form a fourth layer, such that all members of said pair of electrical conductors, in the slots, in the fourth layer are located at the same radial distance D4 from the axis.