Analysis of A-C servomotors operated from unbalanced nonsinusoidal voltage sources and nonlinear discontinuous source impedances
E. R. Lind, N. L. Schmitz · Transactions of the American Institute of Electrical Engineers Part II Applications and Industry · 1960
MANY ANALYTICAL studies directed at the predetermination of output characteristics of a-c servomotors have been based on the assumptions of constant-source impedance and sinusoidal excitation. Under these assumptions, the method of symmetrical components serves admirably, particularly when steady-state characteristics are desired, and in cases where the duration of the mechanical transients makes the electrical transients insignificant.