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The advantages of ferrofluids in microfluidic lab-on-a-chip applications include remote control of the fluid flow within the chips, e.g., mixing of the species using an external uniform magnetic field. Hence, three-stream flow systems consisting of a ferrofluid core clad by two streams of diamagnetic silicone oil were studied. The instability of the ferrofluid, subjected to an external uniform magnetic...
The air-gap field in slotless permanent magnet motor is small. Based on the surface mounted permanent magnet, this paper compares the parallel magnetization with the radial magnetization by finite element calculation. The results show that parallel magnetization can provide larger air flux in the slotless motor. The large effective air gap makes the end leakage serious. In order to resolve this problem,...
Considering the characters of high permeability, high resistivity, low loss and low cost for soft magnetic ferrite in high-frequency alternating magnetic field, this paper proposes a novel high speed permanent-magnet motor based on soft magnetic ferrite. Soft magnetic ferrite ring is used for stator core, rare earth permanent magnet ring serves as the rotor poles, and the slotless configuration with...
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