Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1982-09-22
1984-09-04
Truhe, J. V.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318798, H02P 736
Patent
active
044700008
ABSTRACT:
The machine flux of a rotating-field machine is determined from the digitized values of the machine stator terminal voltages and conductor currents averaged within a sampling period of an associated digital evaluation system. In order to form each component of the machine flux, the average value of a stator terminal voltage of the same phase, reduced by the ohmic voltage drop in that phase of the stator winding of the rotating-field machine, is multiplied by the clock period of the digital evaluation system and by a scaling factor and the average values so formed for each clock cycle are summed up. From the integral so obtained, the digitized value of the conductor current of the same phase averaged within a sampling period of an associated digital evaluation system and appropriately scaled, is substracted. The simulation of the machine flux can thereby be accomplished digitally. Because averaged values of the terminal voltages and conductor currents are used in the method, there are no sampling problems in digitizing the values.
REFERENCES:
patent: 3593083 (1971-07-01), Blaschke
patent: 4245181 (1981-01-01), Plunkett
patent: 4335343 (1982-06-01), Dreiseitl et al.
Gabriel, R. et al., "Field Oriented Control of a Standard AC-Motor Using Microprocessors", IEEE Trans., IAS 79:29G, pp. 910-916.
Regelungstechnik, vol. 27, No. 12, Dec. 1979, pp. 379-386, by Gabriel et al.
Keane Patrick
Siemens Aktiengesellschaft
Truhe J. V.
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