The new three-phased asynchronous motor used in tunnels building

The paper proposes a new axial air-gap three-phased asynchronous motor which will permit an important simplification of the drive system employed in the tunnel building. The building form can be an advantage for an employing in the tunnels building. The motor can be conceived for small rotations and great diameters function of the drive system necessities. The mathematical model has the same structure for a classical machine, but in the electrical parameters calculation (resistances and reactances) there are any special mentions determinate by the geometrical dimensions different for the windings overhang. The simplified mathematic model consists to neglect the stator as well the rotor transformation e.m.f.