Investigation of power loss in wound toroidal cores under PWM excitation

Author

Moses, A.J. ; Tutkun, N.

Author_Institution

Sch. of Eng., Univ. of Wales Cardiff, UK

Volume

33

Issue

5

fYear

1997

fDate

9/1/1997 12:00:00 AM

Firstpage

3763

Lastpage

3765

Abstract

The pulse width modulation (PWM) inverter is widely used when voltage-frequency regulation is required. When laminated cores are energised by PWM voltage supplies additional losses occur due to flux distortion. The iron loss of three types of grain-oriented 3.25% Si-Fe toroidal cores was measured by means of a computer aided system under PWM and sinusoidal voltage excitation at different flux densities. The loss increase under PWM excitation was found to be higher at high flux densities due to higher harmonic distortion. Another important difference between sinusoidal and PWM voltage excitation is a significant difference in the variation of instantaneous energy loss through the magnetising cycle which is also believed to contribute to the additional losses. The losses in the three different geometries were greater under PWM excitation than under sinusoidal voltage and flux

Keywords

PWM invertors; ferromagnetic materials; harmonic distortion; iron alloys; laminations; magnetic cores; magnetic flux; magnetic leakage; magnetisation; silicon alloys; PWM excitation; PWM inverter; PWM voltage supplies; Si-Fe; computer aided system; flux densities; flux distortion; grain-oriented Si-Fe toroidal cores; harmonic distortion; instantaneous energy loss; laminated core; magnetising cycle; power loss; pulse width modulation inverter; sinusoidal voltage excitation; voltage-frequency regulation; wound toroidal cores; Density measurement; Distortion measurement; Harmonic distortion; Iron; Loss measurement; Pulse inverters; Pulse width modulation; Pulse width modulation inverters; Voltage; Wounds;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.619564

Filename

619564