Induction Motor Speed Control System Research Articles

Basic considerations on applications of optimal control and the microprocessor to the induction motor speed control system

Abstract Basic considerations are described for a design of a speed control system of the static Scheribus induction motor system using a microprocessor as a controller. It is proved that three constraints should be taken into account in this system (1) Input dead time due to signal processing time in a microprocessor (2) Input variable constraint due to avoiding commutation failure of an inverter (3) State variable constraint due to limited capacities of thyristors or diodes Moreover, an employed control system design technique must be realizable for real time control by a microprocessor. A proposed improved optimal regulator technique is able to deal with above constraints, guarantees good steady state characteristics in spite of parameter variations of controlled object and of course is realizable for real time control by a microprocessor, though the synthesized control system is sub-optimal. This technique is also applicable to multi-input multi-output systems. An important simulation result obtained ...

Dynamic Performance of a Closed-Loop Induction Motor Speed Control System with Phase-Controlled SCR's in the Rotor

The dynamic behavior of a closed-loop variable-speed induction motor drive system which uses three phase-controlled silicon-controlled rectifiers (SCR's) connected in delta configuration and placed at the open star point of the rotor circuit is investigated. The various functional blocks of the system which govern the behavior of the system for small variations about the operating point are derived, and the responses for load and reference speed perturbations are obtained analytically. The analytical results are compared with experimental values.

Direct design procedure for single-input feedback systems†

Abstract By studying the properties of the return-difference of single-input closed-loop systems, a direct relationship is found between the feedback matrix and the closed-loop poles, thereby establishing a direct design method. On the basis of this relationship, a computational algorithm is developed which calculates the feedback matrix for a desired closed-loop response. The method is extremely fast and thus well-suited to the computer-aided design of single-input systems. Furthermore, a discussion of controllability is given and the method is illustrated by applications to feedback design of cascaded amplifiers and an induction motor speed control system. Some advantages of this design procedure over a modal technique are also discussed.