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adjustable 500mA bipolar current control for PCB trace electromagnet

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lynaghk:
Just to follow up, I had a PCB made and was able to successfully use it as a linear motor to drive around 1mm disk magnets (see attached photo).

Background research / theory and initial measurement notes: https://kevinlynagh.com/pcb-stepper/

One interesting finding is that trying to switch the H-bridges anywhere close to 250 kHz greatly limits the current output.
Presumably the switching losses that I neglected to model in Micro-Cap are not, in reality, negligible. =D

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