Flux observer with online tuning of stator and rotor resistances for induction motors

This paper proposes an adaptive flux observer for induction motors, where stator and rotor resistances are estimated in online environments. The variation of motor parameters during operation degrades the performance of the controller and the flux observer. Among the parameters of induction motors,...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2002-06, Vol.49 (3), p.653-664
Main Authors: Jeon, Seok Ho, Oh, Kwang Kyo, Choi, Jin Young
Format: Article
Language:English
Subjects:
Current measurement
Degradation
Flux
Induction motors
Linear feedback control systems
Motors
Observers
On-line systems
Online
Parameter estimation
Rotors
Stators
Studies
Synchronous motors
Torque control
Voltage
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Summary:This paper proposes an adaptive flux observer for induction motors, where stator and rotor resistances are estimated in online environments. The variation of motor parameters during operation degrades the performance of the controller and the flux observer. Among the parameters of induction motors, rotor resistance is a crucial one for flux estimation, and stator resistance also becomes critical in the low-speed region. Under the persistent excitation condition, the proposed method estimates the actual values of stator and rotor resistances simultaneously, which guarantees the exact estimation of the rotor flux. The persistent excitation condition is not satisfied when the electric torque of an induction motor is absent due to the lack of rotor currents. Even in this case, the proposed method achieves the correct estimation of the rotor flux. Simulations and actual experiments show that the rotor flux is estimated in all operating conditions and that both resistances converge to their actual values when the electrical motor torque exists.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2002.1005393