A bit-stream based scalar control of an induction motor

A field programmable gate array (FPGA) implementation of constant V/f scalar controller is presented. The implementation technique uses uniformly weighted single-bit streams. Various building blocks which are required for the implementation have been detailed. Preliminary experimental results on a three phase induction motor (IM) show that the technique is a viable alternative to standard techniques. The implementation uses approximately 600 logic elements (LE) on an Altera Stratix FPGA. Also this method is inherently parallel in nature and hence timing difficulties, as a result of an increase in complexity, are minimized.