Method of measuring motor constant for induction motor

Details Method of measuring motor constant for induction motor Method of measuring motor constant for induction motor

2006-05-02

2006-05-02

Wachsman, Hal (Department: 2857)

Data processing: measuring, calibrating, or testing

Testing system

Of mechanical system

C702S064000, C318S727000

Reexamination Certificate

active

07039542

ABSTRACT:
A method of measuring a motor constant is provided in a vector control apparatus for an induction motor. A voltage output phase θv is set at a previously set arbitrary phase. Prior to applying a current, a current command is fed to operate the vector control apparatus with a proportional-plus-integral controller being set operative. After conduction for a predetermined time, the gain of the proportional-plus-integral controller is set to zero to maintain an integrated value constant and accordingly fix a voltage command value. In this state, a current command value and a detected current value are measured. This measurement is performed at two levels of current, and a primary resistance value (or a line-to-line resistance value) is derived from the slope.

REFERENCES:
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patent: 6281659 (2001-08-01), Giuseppe
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patent: 2001-194433 (2001-07-01), None
Khambadkone et al., “Compensated synchronous PI current controller in overmodulation range and six-step operation of space-vector-modulation-based vector-controlled drives”, Jun. 2002,IEEE Transactions on Industrial Electronics, vol. 49, 3, pp. 574-580.
JEC-37 ( Prior Art Example 1), no translation.

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