Superconducting electric motor with stator ring winding
One of the promising trend of modern transportation systems development is transition to electric propulsion. This is topical for aircraft industry too. However, to solve this problem it is necessary to design electric motors with high power density over 20 kW/kg. To achieve such figures of the specific power is possible only using cryogenic cooling, and modern superconducting materials. Design of the electric motors with superconducting inductor and armature windings, will allow obtain maximum benefits in terms of weight and size. This relates to the possibility of increasing the magnetic induction value in the motor air gap, as well as with the stator linear load increase. Design a fully superconducting electric motors is complicated by the absence of any universal computation methods, as well as a number of design features and the critical parameters of high temperature superconducting tapes nonlinearity. All this requires the development of new computation methods for such kind electric motors. The paper presents a fully superconducting electric motor with a ring armature winding and the method of determining the its specific power and the results of finite element modeling in three-dimensional formulation. The obtained analytical expression for the main magnetic flux allows derive an equation for the power density of HTS machines with annular armature winding. It is shown, that this power may exceed the value of 20 kW/kg.