Motor related principles and performance characteristics: main features of single-phase single-value running asynchronous motor; design of single-phase single-value capacitor running motor; related calculation of main parameters; design of Wind Wear; design of main winding and auxiliary winding; The calculation of starting performance; the calculation of running performance; the principle of starting frequency conversion speed control; the improvement of motor performance and the improvement of capacitor running start performance and overload capacity; the analysis of running feasibility and economic performance