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Jun 18, 2016, 10:20 PM
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Probing current


Graphed the 2 current resistors for all phase & got the same nonsensical wave. They should have been sine waves, but looked more like sine waves with humps. From these 2 resistors, it should be possible to derive the current in the 3rd winding, revealing the total current of the motor. The total current should be constant, but the waveforms said otherwise.


Graphed the resistors with no current, but instead of 0, got values near the top of the waveforms. These were virtual grounds, revealing the waveforms were the bottom half of sine waves. They got a little above virtual ground, but quickly broke down.

The mowtimeter showed the MOSFETs providing current in both directions, but the resistors didn't. The resistors only measured current going into ground. Why did they bother with a virtual ground if they only showed the bottom half?
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