Magnetic saturation and steady-state analysis of electrical motors

摘要

A method is presented for the steady-state analysis of universal motors operating under direct or alternating voltage sources, and in the presence of saturation of the iron in he magnetic circuit. The saturation is modeled through a completely general functional dependence of he air-gap flux on the current, thus resulting in a unified treatment for various saturation models. It is shown that the calculation of he steady-state response can be reduced to the solution of a single algebraic equation. The presence of saturation is shown to increase both the amplitude and the phase alg of the current. For a particular saturation model having the form of a rational function, analytical formulas are derived which allow for the calculation of the current from its unsaturated or fully-saturated values. The changes in the input power, output power, and mechanical efficiency of the motor due to saturation are investigated.