Abstract
In this work, a high-frequency model of permanent magnet synchronous motor (PMSM) is proposed for using in conducted electromagnetic interference (EMI) modelling and simulation of variable speed drive systems. The presented model covers the defined frequency range for the conducted emissions, based on MIL-STD-461 and FCC/CISPR standards from 10 kHz to 30 MHz. Common-mode (CM) and differential-mode (DM) impedance characteristics of PMSM are measured; the proposed method is based on the behavioural method using the measurement data. However, in order to improve the mid-frequency representation, the model is enhanced by physics-based methods with parameters extracted directly from the physical properties of the motor using a three-dimensional finite element method and analytical calculations. This approach enables us to avoid the trial and error method and fine-tuning the model parameters. In order to validate the calculated CM and DM impedances of the PMSM, simulation results are compared with the experimental measurements. Root mean squared relative error is introduced to measure the accuracy of the proposed model and also to compare the given results with the models previously presented in the literature.
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