In this paper the design and the magneto-static simulation of axial-flux permanent- magnet stepper motor with the disc type rotor is presented. Disk motors are particularly suitable for electrical vehicles, robots, valve control, pumps, centrifuges, fans, machine tools and manufacturing. The brushless machine with axial flux and permanent magnets, also called the disc-type machine, is an interesting alternative to its cylindrical radial flux counterpart due to the disk shape, compact construction and high torque density. This paper describes a design of four phase microstepping motor with the disc type rotor. The FEM modeling and the 3D magneto-static simulation of the disk stepper motor with permanent magnets is being subject of the article, too. Disc rotor type permanent magnet stepper motor for high torque to inertia ratio is ideal for robotics and CNC machines.
Topography and toponymies of Dunöyane were discussed in brief. The location of Lammas Islands was considered. The author recognized it as a trace of discovery of Dunöyane by Hudson in 1607. Historical data on human activity in this region was presented with a closer look at the murder of 10 Russians in 1819 and at Norwegian economic exploitation in the 19th and 20th centuries.
The phytogenic food composition in the stomachs of Euphausia superba Dana, caught at 18 sampling stations in the Antarctic part of the Atlantic Ocean, was analysed. The material used was taken from krill catches made from the board of the r/v "Profesor Siedlecki" in the sector "A" of the BIOMASS-FIBEX Programme, in February and March 1981. In the food of Euphausia superba 70 algal taxa were identified, including 68 taxa belonging to Bacillariophyceae and two to Chrvsophyceae. Planctonic diatoms were the main component of the food of Euphausia superba. Single benthic diatoms were found occasionally.