This article proposes a mathematical model of an axial flux induction motor (AFIM) with one stator and one rotor. The model is based on the expression for the electromagnetic torque, which presents a function of two independent variables: the axial length of the stator core and the flux density in the air gap. This allows calculating the main dimensions of the motor with the highest possible torque density. Thus, developed model is suitable for designing the motor of specified volume with maximum torque, and solving the inverse problem of minimizing the machine volume with the specified torque. The detailed output of the model and the results of the calculations for the low-power engine powered by voltage of 7.35 V (RMS) are given. The results are validated using FEM in ANSYS software: with the outer motor diameter of 0.11 m, the flux density in it reaches 1.2 T.

Electric power industry is the basic branch of the entire modern economy. Without electric energy, human activity is impossible. Large and small enterprises, urban and rural residential buildings, public buildings (schools, universities, kindergartens) need permanent and reliable energy sources. Today, most of the electricity is generated in hydro, thermal and nuclear power plants. Each of them has some disadvantages, including ecology drawbacks. Alternative energy, which is based on renewable energy sources, can solve basic environmental problems, as well as financial issues. The share of alternative energy in the Russian market is growing rapidly. The article provides options for the power supply of public buildings of the Leningrad Region with alternative energy sources. The choice of the best options of power supply is carried out on the example of a school.