Abstract
Practical core losses in electrical machines differ significantly from those experimental results using the standardized measurement method, i.e. Epstein Frame method. In order to obtain a better approximation of the losses in an electrical machine, a simulation method considering sinusoidal pulse width modulation (SPWM) and space vector pulse width modulation (SVPWM) waveforms is proposed. The influence of the pulse width modulation (PWM) parameters on the harmonic components in SPWM and SVPWM is discussed by fast Fourier transform (FFT). Three-level SPWM and SVPWM are analyzed and compared both by simulation and experiment. The core losses of several ring samples magnetized by SPWM, SVPWM and sinusoidal alternating current (AC) are obtained. In addition, the temperature rise of the samples under SPWM, sinusoidal excitation are analyzed and compared.
Highlights
Modern alternating current (AC) drives are usually fed with voltage source inverters (VSI) with pulse width modulation (PWM) schemes,[1] which can cause extra core losses due to the presence of harmonic components
In order to obtain a better approximation of the losses in an electrical machine, a simulation method considering sinusoidal pulse width modulation (SPWM) and space vector pulse width modulation (SVPWM) waveforms is proposed
Modern AC drives are usually fed with voltage source inverters (VSI) with PWM schemes,[1] which can cause extra core losses due to the presence of harmonic components
Summary
Modern AC drives are usually fed with voltage source inverters (VSI) with PWM schemes,[1] which can cause extra core losses due to the presence of harmonic components. Optimization of system efficiency is a challenge for magnetic material producers, motor designers and consumers to optimize the performance of machine cores under completed magnetization condition.[2] Since core losses account for a large percentage of the total motor losses, predicting core losses caused by PWM voltage is very important in the stage of motors design and during analysis for realizing high efficiency and high performance.[3] The extra core losses increase the temperature of the machines and reduce the efficiency and the lifetime. SPWM and SVPWM are two widely-used PWM patterns.
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