Pressure is going to be an issue.
In oil drilling, they use a similar concept. It's a lobe pump, but both the rotor and stator have lobes. The rotor has 1 fewer lobes than the stator.
Depending on the diameter of the rotor/stator assembly, and the number of lobes used, they can either drill for "high torque" or "high speed", depending of course, on the type of material that's being drilled (sand, shale, granite, mineral deposits,...)
High torque would be your high pressure. In this case though, you'd use the concept in reverse: drive the rotor (electrically?), instead of what they do out in the oil fields: pump fluid down at various pressures and flow rates.
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