Method for estimating the rotor time constant of an...

Details Method for estimating the rotor time constant of an... Method for estimating the rotor time constant of an...

2007-07-31

2007-07-31

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Induction motor systems

Reexamination Certificate

active

11444296

ABSTRACT:
A method for estimating the rotor time constant (τr) of an induction machine when the stator resistance (Rs) and rotor resistance (Rr) of the induction machine are known. The method comprises the steps of feeding a DC current to the stator of the induction machine, injecting a sine-wave current component into the stator of the induction machine, the current having an amplitude (isc) and an angular frequency (ωc), measuring the voltage component (uscd) of the stator voltage of the induction machine in the same direction and with the same angular frequency as the injected current, and calculating the rotor time constant using equationτr=1ωc⁢uscd-Rs⁢isc(Rs+RR)⁢isc-uscd.

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Abdellfattah Ba-Razzouk, Implementation of a DSP Based Real Time Estimator of Induction Motors Rotor Time Constant, IEEE Transactions on Power Electronics, vol. 17, No. 4, Jul. 4, 2002, pp. 534-542, XP-002344348.
M.A.A. Freitas et al., A Novel Rotor Flux Estimator for Vector-Controlled Induction Motor Drives, The 29thAnnual Conference of the IEEE Industrial Electronics Society, vol. 1, Nov. 2003, pp. 156-161, XP-002344349.

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