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Jun 26, 2016, 07:55 PM
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Feiyu current vs PWM

The last experiments with The Feiyu involved feeling the amount of torque as the phase changed. This revealed the torque dropping to 0 & the motor stalling exactly where there was a glitch in the current sensed by the resistors. That was where the current of a phase reversed direction or where the PWM on any of the phases crossed halfway.

The next step was holding 1 phase at a constant PWM while ramping a 2nd phase from 0 to the 1st phase. The 3rd phase was disconnected. This started with strongly negative current through the current sense resistor. The current approached 0 as the 2 phases got closer.

This revealed the same glitch when the variable PWM started approaching the fixed PWM & 0 current. It was more clear that the current approached 0 faster than it should have as the PWM increased, then leveled off until it hit 0.

Tried the 2 phase test with different values of the constant PWM. That varied the point of inflection in the variable current to match where the stationary PWM was.
Last edited by Jack Crossfire; Jun 26, 2016 at 08:44 PM.
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