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Plastic profiles produced by extrusion die are cooled down and calibrated by calibrators, so it is very important to properly design the cooling system in calibrator for the profile quality. Based on the finite element method (FEM) and the finite difference method (FDM), the numerical simulation of the cooling process is realized for plastic profile within calibrator. The simultaneous shape and topology...
The development and deployment of micro and nano-electro-mechanical systems (MEMS/NEMS) are critical to the economy of each country and society because these technologies will lead to major breakthroughs in information technology and computers, medicine and health, manufacturing and transportation, power and energy systems, and avionics and national security. The assembly of micro-devices involves...
The flux-switching permanent magnet (FSPM) machine exhibits competitive torque capability and power density due to the high flux density. As a penalty, the cogging torque is relative large, resulting in unfavorable torque pulsation. Due to the simple and robust rotor construction, additional dummy slots are adopted to reduce the cogging torque without skewing magnets or teeth. The optimal dimensions...
New flux-switching permanent magnet (FSPM) brushless machine topologies with different stator and rotor pole combinations (Ns/Nr) are developed, with potentially reduced stator and rotor pole numbers without introducing the unbalanced magnetic force. The relative merits of FSPM and flux reversal permanent magnet (FRPM) brushless machines are evaluated. The electromagnetic performance, including back-emf,...
In this paper, some important parameters of cylindrical linear Halbach arrays were presented mathematically and their effect on the field distribution was analyzed by the finite-element method. The results show that the number and axial length of magnet annuli per period have more effect on the field distribution and determine the field pattern in axial direction. With different topologies, cylindrical...
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