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If the opposing force is cyclic with rotor position such that the pulsed or steady state current in each position becomes sinusoidal, then it is possible to sense DC current or emission level of transient current pulse width during commutation with a Narrow band AM radio but this will become unreliable if speed or load is changed. Direct current sensing ...


Think about it for a moment. Even if you know exactly how many steps the motor makes during each movement, there's no way to determine the direction of the movement from the EMI emissions. Therefore, there are two possible answers for each movement, and you can't know which one is correct as the starting point for the next movement.

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