Vector Control of AC MachinesVector 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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Contents
INTRODUCTION | 1 |
The rotor fluxlinkage space phasor in the rotating | 15 |
Electromagnetic torque production in d c machines | 21 |
Copyright | |
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actual angle application assumed axis circuit considering contain converter corresponding current controller current space phasor defined derivative described determined difference direct direct-axis discussed drive effects electromagnetic torque equal estimated excitation expressed field flux flux-linkage space phasor follows from eqn function given gives implementation induction machine input inverter isyref leakage linear linkage magnetizing flux-linkage space magnetizing inductance magnetizing-current space phasor magnetizing-flux-oriented modulus monitored motor noted obtained operation output parameters performance phase position possible present produced reference frame fixed reference value resistance respectively result rotating rotor angle rotor currents rotor flux rotor magnetizing current rotor speed rotor time constant rotor voltage equations rotor-flux-oriented reference frame saturation shown in Fig signal similar stationary reference frame stator and rotor stator current components stator flux stator-flux-oriented substitution supplied synchronous machine three-phase transformation transient two-axis utilizing voltage equations winding yields zero