Winding Function Theory Based Thrust Calculation on Nested-loop Secondary Linear Machine Adapted to Linear Metro

With advantages of strong drive capability, nested-loop secondary linear machine (NLS-LM) has great potentiality in metro. For its structure with multiple loops, it is difficult to calculate the electromagnetic thrust NLS-LM reasonably. Hence, this paper, one calculation method proposed considering variable loop inductance and transient current. Firstly, establish winding function, modeling domain confined a limited range, equivalent span employed by analyzing coupling relationship between primary secondary. Then, order obtain flux density, current solved based on impedance induced voltage. Finally, can be calculated reasonably given sheet density. Comprehensive simulations experiments have demonstrated effectiveness method.