High precision calibration setup for loss measurements in electrical steel sheets
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We present details on the current measurement setup at PTB used for high precision loss calibrations in the frequency range 50 Hz to 1 kHz. A combination of analog and digital feedback control is utilized in accordance with the standard. A detailed measurement uncertainty (MU) analysis based on a systematic model equation is presented and inter-dependencies of model parameters are discussed. Experimental results obtained at 50 Hz on NO and GO Epstein samples show excellent agreement between statistical and systematic MU estimation and confirm the MU model analysis. Furthermore, we investigate the influence of external parameters on the loss measurements, like sample loading scheme and the value of maximum demagnetization polarization.
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