Method of operating an induction motor

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318800, 318805, 187391, 363 98, G01R 1922, H02P 540, H02M 7217

Patent

active

053880528

ABSTRACT:
All N parameters of an induction machine equivalent circuit may be determined by providing a stator voltage such that the induction machine produces no torque, measuring a stator current for at least N-1 frequencies, determining the tangent of the angle .phi. between the stator voltage and stator current at said frequencies, and solving N-1 equations R(.omega.)tan.phi.+X(.omega.)=0, given one of the parameters, said frequency values and said associated values for tangent .phi., where R(.omega.) and X(.omega.) are the real and imaginary components of the complex stator impedance of the induction machine.

REFERENCES:
patent: 3737747 (1973-06-01), Krauer
patent: 4330836 (1982-05-01), Donofrio et al.
patent: 4355704 (1982-10-01), Makinen
patent: 4364453 (1982-12-01), Serina
patent: 4623042 (1986-11-01), Kamaike
patent: 4635491 (1987-01-01), Yamano et al.
patent: 4766977 (1988-08-01), Yamasaki
patent: 4926105 (1990-05-01), Mischenko et al.
patent: 5270594 (1993-12-01), Hulsing, II

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