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

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