Method and apparatus for determining the rotor resistance of...

Details Method and apparatus for determining the rotor resistance of... Method and apparatus for determining the rotor resistance of...

G - Physics

01

R

324/45

G01R 27/02 (2006.01) G01R 31/34 (2006.01) H02P 21/10 (2006.01) H02P 21/14 (2006.01)

Patent

CA 1309462

ABSTRACT OF THE INVENTION In order to determine the rotor resistance of a rotating field machine, a current is impressed in the stator via a field-oriented control, which current has a harmonic component above the nominal frequency of the machine. From the current, the rotor position and a readjustable parameter value for the rotor resistance, a current model calculates a field- parallel EMF component EF1, the harmonic component EF1N of which is isolated. In addition, a voltage model calculates from the current and the voltage, the EMF vector as the current component reference value EF1' and its harmonic component EF?. A correction control CR1 readjusts the parameter rR of the rotor resistance until the difference of the two isolated harmonic EMF components disappears. The test signal has practically no influence on the flux and the torque of the machine. At the same time, the stator resistance rS and the stray inductance xSt can be determined.

588038

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