Method for estimating resistance values of stator and rotor of i

Details Method for estimating resistance values of stator and rotor of i Method for estimating resistance values of stator and rotor of i

1999-01-14

1999-12-07

Ro, Bentsu

Electricity: motive power systems

Induction motor systems

Primary circuit control

324525, G01R 2700

Patent

active

059989580

ABSTRACT:
The resistance values of a stator and a rotor of an induction motor are estimated through the steps of (a) checking whether a control system of the induction motor reaches a normal state, (b) measuring normal state values of the values necessary for estimating resistance values of a stator and a rotor when the control system reaches a normal state, (c) estimating a stator resistance value based on the measured normal state values, (d) applying an AC component to a magnetic flux command input to the control system and calculating a first variable for estimating rotor resistance, (e) obtaining an AC component with respect to each variable by allowing the calculated first variable to pass through a band pass filter, (f) calculating a second variable for estimating rotor resistance based on the AC component with respect to the respective variables obtained above, and (g) estimating rotor resistance using the calculated second variable. Thus, since a stator resistance is estimated based on the condition of the generated torque at the time of estimating resistance of the induction motor and the rotor resistance is estimated through the AC component included in the current and voltage of the stator, the resistance values of the stator and the rotor which vary during the operation of the induction motor can be accurately estimated.

REFERENCES:
patent: 4039907 (1977-08-01), Marsh et al.
patent: 4442393 (1984-04-01), Abbondanti
patent: 5861728 (1999-01-01), Tazawa et al.

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