Abstract
This paper presents a method for the performance analysis of high-speed electric machines supplied with pulse-width modulated voltage source inverters by utilizing a fast analytical model. By applying a strict mathematical procedure, effective expressions for the calculation of rotor eddy current losses and electromagnetic torque are derived. Results obtained by the approach suggested in this study are verified by the finite element model, and it is shown that the proposed method is superior in comparison to the finite element method in terms of computation time. The proposed method enables fast parameter variation analysis, which is demonstrated by changing the inverter switching frequency and electric conductivity of the rotor and analyzing the effects of these changes on rotor eddy current losses. The presented work separately models effects of the permanent magnet and pulse-width modulated stator currents, making it suitable for the analysis of both high-speed permanent magnet machines and high-speed induction machines.
Highlights
In modern times, the use of electric machines in automotive applications increases continuously
Starting from models based on the harmonic modeling method, presented previously by the same author in [28,29], this paper develops an extensive study for the performance analysis of high-speed pulse-width modulated (PWM) supplied electric machines
In the case of multiple time harmonics in stator currents (PWM excitation), all terms are present on the right side of (35), and the instantaneous rotor eddy current losses cannot be obtained by performing the surface integral on the left side
Summary
The use of electric machines in automotive applications increases continuously. More recent references typically treat stator currents in a generic way, allowing multiple time harmonics, but assuming that they are located at frequencies that are integer multiples of the fundamental frequency [20,21,22] This assumption can be found even in papers that model PWM supplied high-speed machines and compare their performance against machines driven by other modulation strategies [23]. Starting from models based on the harmonic modeling method, presented previously by the same author in [28,29], this paper develops an extensive study for the performance analysis of high-speed PWM supplied electric machines Effects related to both spatial harmonics (determined by the machine structure) and time harmonics (determined by the modulation strategy and switching frequency) are properly included. With all significant aspects defined it is possible to analyze machine performance using previously established field solution and accompanying relations
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