Paul A S De Wit

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It is generally accepted that field orientation, in one of its many forms, is the most promising control method for high dynamic performance AC drives. In particular, for induction motors indirect field oriented control is a simple and highly reliable scheme which has become an industry standard. In spite of its widespread popularity no rigorous stability(More)
Robustness to uncertain parameters of this popular induction motor controller is investigated. Conditions for local and global asymptotic stability as well as boundedness of all signals are derived Abstract-Field orientation, in one of its many forms, is an established control method for high dynamic performance AC drives. In particular, for induction(More)
Patients with spontaneous primary subarachnoid haemorrhage (SAH) in whom initial diagnostic investigation, including cerebral four-vessel angiography, does not reveal a cause, present a difficult problem. In a series of 95 patients a cause became apparent in about 10% of cases during the first three weeks, predominantly missed aneurysms. After three weeks(More)
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