Performance of the NASA Digitizing Core-Loss Instrumentation
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Performance of the NASA Digitizing Core-Loss Instrumentation

Performance of the NASA Digitizing Core-Loss Instrumentation


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About the Book

The standard method of magnetic core loss measurement was implemented on a high frequency digitizing oscilloscope in order to explore the limits to accuracy when characterizing high Q cores at frequencies up to 1 MHz. This method computes core loss from the cycle mean of the product of the exciting current in a primary winding and induced voltage in a separate flux sensing winding. It is pointed out that just 20 percent accuracy for a Q of 100 core material requires a phase angle accuracy of 0.1 between the voltage and current measurements. Experiment shows that at 1 MHz, even high quality, high frequency current sensing transformers can introduce phase errors of a degree or more. Due to the fact that the Q of some quasilinear core materials can exceed 300 at frequencies below 100 kHz, phase angle errors can be a problem even at 50 kHz. Hence great care is necessary with current sensing and ground loops when measuring high Q cores. Best high frequency current sensing accuracy was obtained from a fabricated 0.1-ohm coaxial resistor, differentially sensed. Sample high frequency core loss data taken with the setup for a permeability-14 MPP core is presented. Schwarze, Gene E. (Technical Monitor) and Niedra, Janis M. Glenn Research Center NASA/CR-2003-212545, E-14111, NAS 1.26:212545, AIAA Paper 2003-5972


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Product Details
  • ISBN-13: 9781721593309
  • Publisher: Createspace Independent Publishing Platform
  • Publisher Imprint: Createspace Independent Publishing Platform
  • Height: 280 mm
  • No of Pages: 28
  • Spine Width: 2 mm
  • Width: 216 mm
  • ISBN-10: 1721593306
  • Publisher Date: 20 Aug 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 91 gr


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