Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1986-12-04
1988-08-09
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318798, 318803, 324158MG, H02P 540
Patent
active
047630582
ABSTRACT:
For establishing the field direction without mechanical pickup upon startup of a rotating field machine, e.g., in permanent excitation, a high-frequency component (iz*) is impressed on the stator current or on the stator voltage. Thereby high-frequency voltage components (or current components) are coupled into the stator windings, the envelope curves of which are correlated to the position of the field axis of rotor axis. Preferably the components of a model vector (FM) which also contain high-frequency components are calculated by a flux computer (60). The high frequency components isolated in a filter (61) are correlated in a means value former (62) to the components of the direction vector (fx). Thereby a field-oriented operation of a synchronous machine is possible.
REFERENCES:
patent: 3775649 (1973-11-01), Bayer et al.
patent: 3909688 (1975-09-01), Blaschke et al.
patent: 4626761 (1986-12-01), Blaschke
Jansch, et al, "A Fast Response Technique for Measuring and Recording the Load Angle of Synchronous Machines", J. Phys. E. (G.B.) vol. 4, No. 1, Jan. 1971, pp. 43-45.
Heining Hans-Dieter
Wick Albert
Siemens Aktiengesellschaft
Smith Jr. David
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