Morgan M Kiani

US Patent:

20110267012, Nov 3, 2011

Filed:

Apr 29, 2011

Appl. No.:

13/098273

Inventors:

Morgan M. Kiani - Arlington TX, US
Wei Wang - Dallas TX, US
Babak Fahimi - Arlington TX, US
Wei-Jen Lee - Colleyville TX, US

Assignee:

Board of Regents, The University of Texas System - Austin TX

International Classification:

H02P 9/42

US Classification:

322 29

Abstract:

Methods and apparatuses for substantially eliminating torque pulsation in a doubly fed induction machine are disclosed. An example method comprises: measuring a stator current of the doubly fed induction machine, measuring a rotor current of the doubly fed induction machine, calculating a total magnetic flux density in an airgap of the doubly fed induction machine, calculating a tangential force density, calculating an electromagnetic torque, repeating the calculation of the electromagnetic torque over one electrical cycle to estimate a torque pulsation, determining a new rotor current that substantially eliminates the torque pulsation by referencing a set of optimal rotor currents in a look-up table, and changing the rotor current in response to the determination. Other embodiments are described and claimed.