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Area of Science:

  • Biomedical Engineering
  • Electrical Engineering
  • Materials Science

Background:

  • Miniature Ventricular Assist Device (MVAD) pump motors utilize ferromagnetic cores that experience energy losses (core losses) due to alternating magnetic fields during operation.
  • These core losses directly impact the overall efficiency of the MVAD pump system.
  • Understanding and quantifying these losses is critical for optimizing device performance and longevity.

Purpose of the Study:

  • To investigate the core loss behavior of the MVAD pump motor stator.
  • To develop and validate a method for characterizing the magnetic behavior and core losses of the MVAD stator across a range of frequencies.
  • To establish a baseline for evaluating stator performance and variability.

Main Methods:

  • A custom core loss fixture with 16 copper wire turns was designed to measure stator core loss.
  • Instrumentation included a signal generator, power amplifier, and power analyzer to collect current, voltage, and power data.
  • A sinusoidal frequency sweep from 0 to 50 kHz was performed, with data collected for the fixture alone and with stators installed.

Main Results:

  • Baseline magnetic losses of the fixture showed a flat frequency response.
  • Core loss measurements of MVAD stators exhibited a characteristic bandpass frequency response.
  • A peak core loss was identified within the 2.3 to 2.5 kHz range for the tested stators.

Conclusions:

  • The developed method effectively characterizes the transfer function of stator core magnetic behavior.
  • This technique has potential for future MVAD motor evaluations and assessing manufacturing variability in stator core loss performance.