Winding for an electrical machine

A winding for an electrical machine adapted for interacting with an inductor structure providing a sequence of at least one pair of north and south magnetic poles along a length, producing a magnetic field, the poles being separated by a pole pitch distance τp along the length, the winding comprising:

• one or more phases, the number of phases being n;
• and
• a plurality of groups of pairs of conductors, each pair of conductors forming a turn intercepting a fraction of the magnetic field, wherein a first group of the plurality of groups includes:
• a first subgroup of turns of one phase having a spread along the length inferior or equal to τp/n;
• and
• a second subgroup of turns of same phase having a spread along the length inferior or equal to τp/n, at a distance equal to τp from first subgroup along the length, the turns of the first subgroup being connected such that a current may flow in same direction in all turns of the first subgroup, the turns of the second subgroup being connected such that a current may flow in same direction in all turns of the second subgroup, and a turn of the first subgroup being connected to a turn of the second subgroup such that the direction of the current in the first subgroup is opposite to the direction of the current in the second subgroup, the first subgroup and the second subgroup having same number t of turns and
• wherein
• the winding is adapted for moving in relation to the inductor structure along the length,
• said pairs of conductors comprise each a first conductor arranged in a first layer and a second conductor arranged in a second layer, the first and second layers are separated by an intermediate layer, the intermediate layer having a height perpendicular to the length, the intermediate layer being insulating, an extremity of the first conductor being connected to an extremity of the second conductor through an opening in the intermediate layer,
• each of the pairs of conductors forming a turn form a wave, and
• first conductors of the first subgroup of turns are interrupted at mid height and connected through the intermediate layer with corresponding second conductors of the second subgroup, at both ends of the length to form a continuous circuit.