Input-output feedback linearization of sensorless IM drives with stator and rotor resistances estimation

Masood Hajian, Jafar Soltani, Gholamreza Arab Markadeh (Collaborator), Saeed Hoseinnia (Collaborator)

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Direct torque control (DTC) of induction machines (IM) is a well-known strategy of these drives control which has a fast dynamic and a good tracking response. In this paper a nonlinear DTC of speed sensorless IM drives is presented which is based on input-output feedback linearization control theory. The IM model includes iron losses using a speed dependent shunt resistance which is determined through some effective experiments. A stator flux vector is estimated through a simple integrator based on stator voltage equations in the stationary frame. A novel method is introduced for DC offset compensation which is a major problem of AC machines, especially at low speeds. Rotor speed is also determined using a rotor flux sliding-mode (SM) observer which is capable of rotor flux space vector and rotor speed simultaneous estimation. In addition, stator and rotor resistances are estimated using a simple but effective recursive least squares (RLS) method combined with the so-called SM observer. The proposed control idea is experimentally implemented in real time using a FPGA board synchronized with a personal computer (PC). Simulation and experimental results are presented to show the capability and validity of the proposed control method.
Original languageEnglish
Pages (from-to)654-666
Number of pages13
Journaljournal of power electronics
Issue number4
Publication statusPublished - Jul 2009


  • induction motor
  • direct torque control
  • input-output
  • stator flux
  • sliding mode
  • RLS


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