The work is intended to explain the basic ideas related to design of sensorless drive with high-speed permanent magnet synchronous machine and vector control system for the oil-drowned pump. The drive and it's control system must allow the pump operating very reliably under heavy conditions. The digital control system has a hierarchy local-distribute… (More)
Covering arrays are combinatorial structures which extend the notion of orthogonal arrays and have applications in the realm of software testing. In this paper we raise several new problems motivated by these applications and discuss algorithms for their solution.