Force enhancement on a ferrofluid-driven linear stepping motor model

Recent progress in ferrofluids research: novel applications of magnetically controllable and tunable fluids

“…the precise control over ferrouid response and properties using magnetic elds generated by magnetic forces, 1,2,[5][6][7][8] such as in shock absorbers, heat transfer uids in loud speakers, magnetocaloric pumps and heat pipes, bearing lubricants, 9,10 microuidic pumps and valves, [11][12][13] microuidic actuators and devices, 14,15 stepper motors, 16 accelerometers and inclinometers in sensor applications, [17][18][19] separation processes, 20 catalytic reaction supports, [21][22][23][24] and leak-proof seals, 25 in use in pneumatic and hydraulic micro-actuators. [26][27][28] Ferrouids and magnetic nanoparticle suspensions are also of interest in a wide range of biomedical applications, such as contrast agents for magnetic resonance imaging, magnetically targeted and/or triggered drug delivery, hyperthermia treatment of cancer, magneto mechanical actuation of cell receptors, and biosensors.…”

Two theorems about Lorentz method for asymmetrical anisotropic regions

“…4. The magnetic medium can appear in the gap in order to enhance the force value [16]. The ratings are γ = 30 • 10 6 S/m (carriage conductivity), a = 0.02 m (conductive layer width), l = 1.0 m (rotor length), g = 0.01 m (the gap width), Θ 1 = 4870 A (magnetomotive force first harmonic), Y = 1 m (pair-pole length), ν xx = 0.4ν 0 (cross-layer axis reluctivity), ν yy = 0.4ν 0 (move direction axis reluctivity), ν xyδ = 0.1ν 0 , ν yxδ = 0.0 and different gap reluctivities ν xyδ , ν yxδ (Table 1).…”

Two theorems about electromagnetic force in activate anisotropic regions

“…The gap which surrounds the active region R (e.g. rotor) could be filled with ferrofluid [9,10]. As a consequence, the outer region R out (e.g.…”