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Rotor-position estimation for induction machines at zero and low frequency utilizing zero-sequence currents

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3 Author(s)
Staines, C.S. ; Sch. of Electr. & Electron. Eng., Univ. of Nottingham, UK ; Asher, G.M. ; Sumner, M.

This paper considers the position and speed estimation at low- and zero-frequency operations in standard delta-connected cage induction machines (IMs). A rotor-slot detection technique is used, where test vectors are injected during the pulsewidth-modulation (PWM) periods and the resulting zero-sequence-current derivatives (ZSCDs) are measured using a nonintegrating Rogowski coil. The rotor slotting in a near-standard 30-kW symmetric IM is utilized for rotor-position tracking. The rotor-slot number was selected to yield a measurable "position-dependent" ZSC. Experimental results show the variation of the measured current signals with rotor position and how these are used for tracking of the rotor position.

Published in:

Industry Applications, IEEE Transactions on  (Volume:42 ,  Issue: 1 )

Date of Publication:

Jan.-Feb. 2006

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