There may have been simpler or quicker ways to go about it, but got this done with what he had on hand for a fraction of what buying in off-the-shelf parts would have cost. We just love the whole vibe of this build. The video goes into great detail and has a lot of design and build tips. Feedback on the arm’s position is provided by an optical sensor, also DIY, making the current necessary to keep the arm stationary proportional to the input torque.
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The coils are free to move within a strong magnetic field, with a PID loop controlling the current in the coils. ’s torque transducer is completely DIY, consisting of hand-wound coils on the ends of a long lever arm that’s attached to the output shaft of the engine under test by a magnetic coupling.
Dynos need to measure the torque and rotational speed of an engine while varying the load on it, and this one does it with style. That’s a job for a dynamometer, which sets out to build in grand fashion. But when you build a Stirling engine, and you’re of a quantitative bent, having some way to measure its power output would be handy. His current video, linked below, actually has precious little to do with his newfound Stirling engine habit per se. And when they do happen to someone like, things can get interesting mighty quickly. We mustn’t judge - things like this happen in the best of families, after all. Has fallen down the Stirling engine rabbit hole.
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