Belt structures for rotary electrical contact device

A method for manufacturing a rotary electrical contact device, the method comprising:

• constructing a conductive belt, wherein constructing the conductive belt comprises:
• winding a first conductive element and a second conductive element around a winding tool such that the first conductive element forms an inner helical coil and the second conductive element forms an outer helical coil, the outer helical coil surrounding the inner helical coil, the outer helical coil and the inner helical coil having respective first and second ends;
• and
• threading a first end of the inner helical coil into a second end of the outer helical coil such that the inner helical coil and the outer helical coil form the conductive belt;
• obtaining a plurality of at least four sheaves;
• and
• installing the conductive belt around the at least four sheaves such that the conductive belt makes contact with each of the at least four sheaves.

An electric machine comprising:

• a rotor;
• a stator;
• a first sheave disposed about a first axis and coupled to the rotor;
• a second sheave coupled to the stator;
• a third sheave;
• a fourth sheave, wherein the third sheave and the fourth sheave revolve around the first axis during operation of the device;
• and
• a belt that extends around at least a portion of each of the first, second, third, and fourth sheaves such that the belt makes electrical contact with each of the four sheaves, the belt comprising:
• a first helical coil;
• and
• a second helical coil, the second helical coil being wound around the first helical coil.