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Modern drives: now universal variable speed.(Variable Speed Drives)
The rapid growth of electrical variable speed drives (VSDs) and the demands for greater precision yet economic solutions have led to competition. Dominated by the rectifier-inverter-fed induction motor drive, the VSD market has seen an increase in higher performance drives -- both vector controlled and the others -- and the future is looking bright.
Speed-sensorless devices are becoming more widespread, as are permanent magnet synchronous motor drives and forms of reluctance motor drives. Further, intelligent control techniques, like fuzzy logic, neural networks and neurofuzzy, are set to gain widespread adoption among drive vendors as developments focus on software solutions. In fact, the `electronic' integrated motor and controller might be the next breakthrough.
Looking at what's around today, the conventional d.c. motor drive continues to dominate. It's predicted to decline, albeit slowly, but efforts are still being made to reduce …
