Core Loss Analysis of Interior Permanent Magnet Synchronous Machines under SVPWM Excitation with Considering Saturation

Abstract

Abstract:Core loss is one of the significant factors affecting the high power density of permanent magnet machines; thus, it is necessary to consider core loss in machine design. This paper presents a novel method for calculating the core loss of permanent magnet synchronous machines under space vector pulse width modulation (SVPWM) excitation, taking magnetic saturation and cross coupling into account. In order to accurately obtain the direct and quadrature (d-q) axis, current in the given load condition, the permanent magnet motor model under SVPWM excitation has been modified, so as to consider the influence of magnetic saturation and cross coupling effects on the d-q axis flux-linkage. Based on the magnetic field distribution caused by permanent magnet and armature reactions, the stator core loss can be calculated with the core loss analytical model, corresponding to the rotational magnetic field. In this study, the method has been applied to analyze core loss in an interior permanent magnet synchronous machine, and has been validated by the experimental results. The influence of pole/slot number combinations on core loss in the same on-load condition is also investigated. This study provides a potential method to guide motor design optimization.

Development of Equivalent Circuit Models of Permanent Magnet Synchronous Motors Considering Core Loss

“…However, in the stator core of the PMSM, the trajectories of the flux density are not only alternating, but also rotational, and with high-order harmonics. Considering the rotational core loss, many researchers decomposed the flux density into its radial and tangential components B r and B t [36][37][38], and modified the core loss calculation models based on the equation below:…”

Application of the Lyapunov Algorithm to Optimize the Control Strategy of Low-Voltage and High-Current Synchronous DC Generator Systems

“…The switching state of the rectifier is determined by the space vector pulse width modulation method (SVPWM) [24]. In order to ensure that the rectifier is in sinusoidal steady-state operation and the switching function is not saturated, the following conditions must be met:…”

A Hybrid Excited Machine with Flux Barriers and Magnetic Bridges

“…It should be stressed that in this paper only losses in the rotor core have been analyzed. In other papers, analyses regarding losses in the stator core can be found, e.g., [14]. In order to compare iron losses generated in ferromagnetic materials used in the rotor structure, where the passing magnetic flux through the rotor is performed in different ways, losses were computed with Flux3D Transient Magnetic applications with the Bertotti method [12,13] According to this method, iron losses can be divided into three different parts: hysteresis losses, eddy current losses, and excess losses, where kh is the coefficient of hysteresis losses, ke is the coefficient of losses in excess, σ is the conductivity of the material (coefficient of conventional eddy currents losses), d is the thickness of the lamination, kf is the coefficient of filling (the stacking factor) that considers the electrical insulation of the laminations of the magnetic core, f is the frequency, and Bm is the peak value of the magnetic flux density.…”

“…It should be stressed that in this paper only losses in the rotor core have been analyzed. In other papers, analyses regarding losses in the stator core can be found, e.g., [14]. Finally, some essential results of the predicted performance of the ECPMS machine for the analyzed rotor structures obtained from the 3D field analysis are presented in Table 3.…”

“…It should be stressed that in this paper only losses in the rotor core have been analyzed. In other papers, analyses regarding losses in the stator core can be found, e.g., [14].…”