| 摘要 |
A method for estimating the rotor time constant (Ä r ) of an induction machine when the stator resistance (R s ) and rotor resistance (R r ) 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 (i sc ) and an angular frequency (É c ), measuring the voltage component (u scd ) 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 equation Ä r = 1 É c u s c d ˆ’ R s i s c R s + R R i s c ˆ’ u s c d .
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