A family of schemes for the control of torque and speed of the induction machine is described. It has been developed with the intention of closing the gap between high dynamic performance drives, requiring measurement of the rotor position or the field, and the simpler schemes with poor dynamic performance. Dynamic behavior and a static accuracy have been achieved which promise a broad range of applications. This is due also to the relative simplicity of the equipment and insensitivity to changes in resistance parameters. Implementation with a voltage source inverter and a current source inverter are shown. I. REVIEW OF THE PREVIOUS STATE OF THE ARTFOR MANY applications of controlled ac drives, mainly the steady-state behavior is of interest for the user (best possible utilization of the machine, sufficient static accuracy of the control). In these cases emphasis is put on simple signal processing and not on high dynamic performance. On the other hand, the dynamic behavior of the machine is wellknown. Control schemes have been developed for which the only limitation for dynamic performance is how well the chosen inverter type is able to follow the reference values set by the control scheme.Because of the ability of the inverter to change voltage and frequency very quickly, a direct or indirect current limitation is always necessary. Furthermore, the machine is run only in operation modes where the losses are nearly minimal. The classical mode is operation with approximately constant field and field weakening only in an upper speed range.
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