Current frequency based identification scheme for resonance detection in Hybrid Stepper Motor.

Electrical Engineering

Stepper motors suffer with skipped steps due to the occurrence of resonance and instability, under certain load conditions. Unlike in other machines, variation of torque is not reflected in the current. Hence the current measurement based position estimation techniques fail. Experimental investigations reveal that high frequency variations are present in the current dynamics during the resonating periods. This paper proposes an identification technique which works based on frequency content during the transient period of the current rise. It is shown that resonance can be identified and with suitable compensation, current measurement based identification technique provide accurate speed & position estimation.

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