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Evaluating the Practical Low-Speed Limits for Back-EMF Tracking-Based Sensorless Speed Control Using Drive Stiffness as a Key Metric

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2 Author(s)
Hejny, R.W. ; MTS Syst. Corp., Eden Prairie, MN, USA ; Lorenz, R.D.

Although it is widely known that back-electromotive-force tracking has a low-speed limit, there is very little published literature evaluating this limit. This paper shows that the low-speed limit is mainly a function of the amplitude of the inverter harmonics and that theory and simulation will provide erroneous results when inverter harmonics are not incorporated. This paper will also provide a method for evaluating this low-speed limit using drive stiffness as the metric. The experimental results show quantitatively how the drive stiffness suffers as speed decreases, which ultimately sets the practical low-speed limit.

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Industry Applications, IEEE Transactions on  (Volume:47 ,  Issue: 3 )