Loss prediction in switched reluctance motors using finite element method

Abstract

SUMMARYIn the present paper, a core loss model for switched reluctance motor (SRM) is developed using ANSYS finite element package. In this model, the flux waveform in one part of the magnetic circuit of the motor is predicted by analysis of the motor with finite element method (FEM), and then the flux waveforms in other sections of the motor are determined using this predicted flux waveform. To validate the obtained flux waveforms, they are compared with those predicted solely by analysis of the motor with FEM. Since the flux waveforms are completely non-sinusoidal, three different methods based on the Steinmetz equation are utilized to estimate the core loss, and the estimated loss are compared with measured data. For the measurement, an experimental set-up is introduced and various aspects of the core loss measurement of SRM are discussed.

Method for estimating core losses in switched reluctance motors

“…All the simulations, curves and results presented here refer to this motor, whose dimensions are indicated in Table II [7,8]. Figure 4 shows the finite element analysis in the aligned and unaligned positions.…”

“…Frequently, the specific hysteresis loops has been computed using Steinmetz equation in its original form or with some variations, usually in the exponent of the peak value of the flux density [7,8]. Recently, various authors have used Preisach-type hysteresis operators to calculate specific hysteresis losses [5].…”

“…Charton et al [5,6] included core losses in their SRM model by using dynamic simulations. Faiz et al [7] simulated the motor using finite elements methods and then calculated the losses based on the modified Steinmetz equation. Reinert et al [8] also used a modified Steinmetz equation in which the remagnetization frequency is replaced with an equivalent frequency calculated from the average remagnetization ratio.…”

The efficiency estimation of 15–10 double salient-pole Homopolar Brushless dc Generator

“…Therefore the expression for the average classical eddy-current losses (P eddy ) in W/kg is [3], [4]:…”

“…However, both radial and circumferential components of flux density are significant in some small regions such as the poles tip or at the corner between the poles and back iron.Therefore, the core loss produced by rotational flux density needs to be calculated for more accurate estimation of core loss. Finite elements method, Fourier analysis, modified Steinmetz equation and dynamic simulations included core losses are different methods for calculating core losses in salient-pole machines [2,3]. calculated core losses based on magnetic flux waveforms predicted from the motor simulation presented by Ref.…”