## What is/are Rotating Fields?

Rotating Fields - In this work, we investigate the semiclassical limit for a coupled system of Gross–Pitaevskii equations with rotating fields and trap potentials in a two-dimensional exterior domain, where the superfluid is non-vanishing at infinity.^{[1]}This chapter deals with the formulation of the rotating fields that could be generated considering different techniques, such as: (i) moving a single phase winding linked to the rotor and fed by a DC current (case of the field of the synchronous machines), and (ii) feeding a poly-phase winding by poly-phase sinusoidal currents.

^{[2]}In this paper, more than 10 different iron loss models are experimentally evaluated, which cover alternating and rotating fields, the influence of temperature, dc bias flux density and distorted flux density due to pulsewidth modulation inverter.

^{[3]}This phenomenon complicates the frequency-dependent modeling of hysteresis under rotating fields and causes inaccurate prediction of core losses when conventional hysteresis models are used.

^{[4]}