A high-density stator core for use in electrodynamic devices is fabricated by the electromagnetic pressing of an iron-based powder coated with a dielectric material and methods for performing the electromagnetic pressing are disclosed. An arrangement for transferring a translation of a drive means to a plunger for pushing against the stopper includes a release latch pivoted at one end and connected to either the drive means or the plunger. The data processor uses the time-scaling factor to convert each sensor unit’s local-clock data-sampling times to the reference local-clock data-sampling times, and the data processor subsequently interpolates sensor data to approximate simultaneous sensor-data values at desired reference local-clock times. A bipolar plate is further provided comprising a fluid barrier having the perimeter of the fluid barrier between a preformed cathode sealing frame and an anode sealing frame.