Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1979-07-18
1982-06-15
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318702, 318803, 318811, H02P 528, H02P 534
Patent
active
043353436
ABSTRACT:
For forming an electric voltage signal which is proportional to a flux component of a rotating-field machine, a voltage associated with the flux component is fed to the input of an integrator, and a voltage signal proportional to the flux component is taken off of the integrator. The input of a zero-controller for suppressing the DC component of this voltage signal is connected to the output of the integrator and the output of the zero-controller is connected to a summing point at the input of the integrator. This integrator circuit can be used to determine the position of the flux of a rotating field machine, with the correct phase and amplitude, and independently of frequency, while the zero-controller remains engaged at speeds from the beginning of localization of standing rotor position up to the nominal frequency of the machine. The zero-controller has a P-controller and an I-controller whose output signals are fed to the summing point. The output signal of the integrator, weighted in proportion to the frequency of the machine, is fed to the input of the P-controller and, weighted in proportion to the square of the frequency, is fed to the input of the I-controller, the weighting factor having a maximum value of one. The circuit constitutes an AC voltage integrator having a characteristic frequency which depends on the frequency of the rotating field machine, the intercept frequency and the attenuation remaining constant. The phase error remains constant over the entire speed range of the rotating field machine.
REFERENCES:
patent: 3593683 (1971-07-01), Blaschke et al.
patent: 3902109 (1975-08-01), Speth et al.
patent: 4119893 (1978-10-01), Bayer et al.
Dreiseitl Walter
Kollensperger Dieter
Salzmann Theodor
Schlegel Thomas
Weigel Wolf-Dieter
Siemens Aktiengesellschaft
Smith Jr. David
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