In a variety of motor models, the effects of iron-loss (ILS) on motor control accuracy and\nefficiency are generally ignored. This makes it difficult for the motor control system to obtain\naccurate control parameters (especially on high speed and low load conditions), and limits the\nimprovement of motor control accuracy. This paper aims to clarify the influence of different ILS\nmodeling and observation methods on motor control performance. Three equivalent models of\nmotors with iron losses are compared. These models are: A parallel model, a series model and the\nsimplified traditional model. Three tests are conducted to obtain the effect of ILS perturbation on\nILS estimation results, and then to derive the sensitivity of the motor state and torque to the\nperturbation. These test conditions include: Ideal no-load, heavy-load, locked-rotor, and ILS\nperturbations during speed regulation. Simulation results show that the impedance and excitation\ncharacteristics of the series model and the parallel model are similar, and the traditional model has\nthe best speed regulation smoothness. The ILS estimation errors of the series model is nearly\nconstant and easy to compensate. For accurate ILS observation results, the series model can achieve\nbetter control accuracy.
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