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.
Highlights
Space vector pulse width modulation (SVPWM) has been widely used in machine control systems because of its high output of current waveforms and high direct-current voltage utilization, and its status is becoming more and more important with the development of power electronics
The magnetic field and stator core loss can load condition can be calculated by Equations (1)–(4), where the inductances and flux-linkage are be obtained by a two-dimensional (2D) time-step finite element analysis (FEA) method
This paper presents a method for calculating the core loss of a permanent magnet synchronous machine under SVPWM excitation
Summary
Space vector pulse width modulation (SVPWM) has been widely used in machine control systems because of its high output of current waveforms and high direct-current voltage utilization, and its status is becoming more and more important with the development of power electronics. Based on the previous research presented above, a novel method for calculating the core loss of IPMSM machines under SVPWM excitation considering magnetic saturation is proposed in the paper. The influence of pole/slot number combinations with consideration to the saturation effect on core loss and total loss in the same load condition has been investigated in the paper. It has thetotal potential guide motor designhas optimization. Section analyzes the magnetic field distribution and core loss in the different method for calculating core loss under SVPWM excitation with consideration to magnetic saturation loadcross conditions.
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