Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1989-01-09
1989-11-28
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
324 62, 324545, 364550, G01R 3102, G01R 2702
Patent
active
048840238
ABSTRACT:
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 EF1.sub..about. 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 EF1'.sub..about.. A correction control CR1 readjusts the parameter r.sub.R 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 r.sub.S and the stray inductance x.sub.St can be determined.
REFERENCES:
patent: 4441065 (1984-04-01), Bayer et al.
patent: 4626761 (1986-12-01), Blaschke
patent: 4829234 (1989-05-01), Gretsch
Schierling Hubert
Schmidt Rolf
Karlsen Ernest F.
Siemens Aktiengesellschaft
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