Abstract
A microcomputer-based direct primary flux and torque control system for three-phase induction motors is presented, showing that the instantaneous primary flux of the induction motor can be calculated by means of computer software. The control algorithm can be implemented online with only a 1 K ROM memory. The controller, therefore, can be quite compact, and both the hardware and software implementation are easy to achieve. A full digital controller using a 16-bit microcomputer is developed. The experimental results are presented and agree with the theory. It is shown that by selecting a space nonzero voltage vector and its time width the amplitude of the primary flux can be controlled, and by selecting a space zero voltage vector and its time width the amplitude of the electromagnetic torque can be controlled. Therefore, flux and torque control can be achieved independently. >
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