Vector control of AC machines
Vector control has become a powerful and frequently adopted technique that permits the use of induction and synchronous machine drives for high-performance applications previously restricted to unwieldy d.c. drives. This book provides detailed discussion of the various forms of vector control of smooth-air-gap and salient-pole electrical machines supplied by impressed stator voltages, currents, or impressed rotary currents. It includes coverage of rotor oriented, rotor-flux oriented, stator-flux oriented, and magnetizing-flux oriented control. Other topics include the necessary decoupling circuits, the effects of non-ideal drives, and rotor speed and rotor resistance identification by means of model reference adaptive control theory. This is an ideal text for students and for anyone requiring in-depth coverage of space phasor and generalized electrical machine theories and the control of variable-speed a.c. drives.
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angular slip frequency considering eqns current controller current space phasor cycloconverter d.c. machine decoupling circuit drive electromagnetic torque flux-linkage space phasor follows from eqn implementation induction machine input instantaneous values leakage inductance linear magnetic conditions magnetizing flux magnetizing flux-linkage space magnetizing inductance magnetizing-current space phasor modulus obtained output parameters phasor with respect quadrature quadrature-axis stator current reactance reference frame fixed reference value rotor angle rotor currents rotor flux rotor flux-linkage space rotor magnetizing current rotor magnetizing-current space rotor reference frame rotor resistance rotor speed rotor time constant rotor voltage equations rotor-flux-oriented control rotor-flux-oriented reference frame saturation self-inductance shown in Fig slip angle special reference frame stationary reference frame stator and rotor stator current components stator flux linkages stator voltage equations stator windings stator-current space phasor stator-flux-oriented reference frame substitution of eqn synchronous machine three-phase thyristor torque-producing stator current transformation two-axis components utilizing vector control