Lamination core loss measurements in machines operating with PWM or nonsinusoidal excitation

Mthombeni, L.T.; Pillay, Pragasen; Singampalli, N.A.

doi:10.1109/iemdc.2003.1210319

Cited by 17 publications

(11 citation statements)

References 5 publications

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“…Core loss results under non-sinusoidal excitations will be compared with the 700-turn frame results. There is a need to understand and quantify core losses under non-sinusoidal excitations [8] [9]. This frame can be considered a step toward defining a new way of testing laminations at higher frequencies.…”

Section: Core Loss Test Resultsmentioning

confidence: 99%

A New Epstein Frame for Lamination Core Loss Measurements at High Frequencies and Flux Densities

Mthombeni

Pillay

2005

IEEE International Conference on Electric Machines and Drives, 2005.

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This paper presents a new Epstein frame optimized for high frequencies and high flux densities. The design philosophy and test results at high power frequencies are presented. The frame achieves high frequency and high flux density performance because of reduced number of turns and reduced number of samples, while using standard 25-cm Epstein samples. For the current application, only the 0.0140-inch (0.36 mm) M45 was used. Measured results obtained show good agreement with the core loss data provided by the steel manufacturers measured using the old frames, at 200 Hz, 300 Hz and 400 Hz. Results at 600 Hz and 1.0 kHz are also presented for the M45 samples along with the test bench used.

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Section: Core Loss Test Resultsmentioning

confidence: 99%

A New Epstein Frame for Lamination Core Loss Measurements at High Frequencies and Flux Densities

Mthombeni

Pillay

2005

IEEE International Conference on Electric Machines and Drives, 2005.

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“…These current ripples will increase the losses in the machine. The current ripple will have a direct influence on the core losses [1], [2], [3] and the induced eddy currents in the permanent magnets [4]. Paper [5] shows that iron loss increases by a limited amount by adding PWM, but the eddy current loss in PMs increases a lot.…”

Section: Introductionmentioning

confidence: 99%

A Computationally Efficient Method to Determine Iron and Magnet Losses in VSI-PWM Fed Axial Flux Permanent Magnet Synchronous Machines

et al. 2014

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For electrical machines with a 3D geometry such as axial flux permanent magnet machines, the computation of iron losses and magnet losses in case of PWM supply could be performed by a transient 3D Finite element model (FEM) coupled with an electrical circuit. To reduce the CPU time, in this paper, these losses are computed with acceptable accuracy without using a 3D transient FEM. The multislice technique is used with a 2D static FEM, combined with a state space model of the machine. A Preisach hysteresis model is considered to evaluate the iron loss during minor loops. The loss in the electrical steel and in the magnets is evaluated for several PWM frequencies as well as for different segmentations of the magnets. Index Terms-Finite Element Analysis, pulse width modulation (PWM), losses, permanent magnet synchronous machine, axial flux, Preisach model 0018-9464 (c)

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“…When fed from an inverter, a motor experiences various frequencies higher than 50/60 Hz and the 50/60 Hz core loss data from steel manufacturers is not appropriate in determining the core losses accurately. Besides PWM supplies, nonsinusoidal excitation exists by design in some machines like the switched reluctance motors (SRM) [2], thus resulting in increased core losses.…”

Section: Introductionmentioning

confidence: 99%

“…In [2], a core loss trend inside the SRM was presented using core loss measurements only. This paper advances that work in the following manner: Firstly, through core loss predictions and measurements the core loss trend inside the SRM is presented.…”

Section: Introductionmentioning

confidence: 99%

Lamination Core Losses in Motors With Nonsinusoidal Excitation With Particular Reference to PWM and SRM Excitation Waveforms

Mthombeni

Pillay

2005

IEEE Trans. On Energy Conversion

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The effects of varying the modulation index and the switching frequency on steel lamination core losses when excited with pulse width modulated waveforms are first investigated. A switched reluctance motor flux model is also developed and flux waveforms for different parts of the machine are synthesized. Using these flux waveforms, the paper presents the loss trend inside a switched reluctance machine, showing the core loss variation of the machine. The rotor was found to incur higher losses than any other part inside the switched reluctance motor. The paper further identifies the flux density harmonics that contribute to higher core losses in the rotor. Using the Fourier series, an attempt to predict core losses under switched reluctance motor flux density waveforms is done and the predicted results are compared with measurements. An Epstein frame was used for direct core loss measurements on 0.0140 in. [0.36 mm] commercial electrical steel; the methods and test bench used, along with test results are detailed in the paper.

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Lamination core loss measurements in machines operating with PWM or nonsinusoidal excitation

Cited by 17 publications

References 5 publications

A New Epstein Frame for Lamination Core Loss Measurements at High Frequencies and Flux Densities

A New Epstein Frame for Lamination Core Loss Measurements at High Frequencies and Flux Densities

A Computationally Efficient Method to Determine Iron and Magnet Losses in VSI-PWM Fed Axial Flux Permanent Magnet Synchronous Machines

Lamination Core Losses in Motors With Nonsinusoidal Excitation With Particular Reference to PWM and SRM Excitation Waveforms

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