Materials Literature
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Initial sizing of a brushless radial-flux permanent magnet (PM) machine is typically based on assumptions regarding the electric- and magnetic- loading together with the motor's active volume. Additional design assumptions include the winding current density and magnetic flux density within the core pack. These initia…
Micro‐ and nano‐electromechanical systems (MEMS and NEMS) fabricated in 3 C‐SiC are receiving particular attention thanks to the material physical properties: its wide band gap (2.3 eV), its ability to operate at high temperatures, its mechanical strength and its inertness to the exposure in corrosive environments. Ho…
Using first-principles calculations within the generalized gradient approximation (GGA) + U framework, we investigate the effect of C doping on the structural and electronic properties of LiFePO 4 . The calculated formation energies indicate that C doped at O sites is energetically favoured, and that C dopants prefer…
A new kind of nanofluids based on insulating oil was prepared with ZnO nanoparticles synthesized by solvothermal reaction, aiming at enhancing both the dielectric and thermal characteristics of insulating oil. A linear dependence of the effective electrical conductivity on volumetric fraction has been observed, and th…
Element substitution is usually used to improve the glass forming ability (GFA) and magnetic properties of alloys. We obtain Gd55Al20Ni20Co5 bulk metallic glass (BMG) by minor Co substitution for Ni in the Gd55Al20Ni25 glass-forming alloy. The Gd55Al20Ni20Co5 BMG exhibits a better GFA and magnetocaloric effect (MCE) t…
This paper introduces the recent technological progress in China on the manufacture of die cast Copper Motor Rotors (CMR) for induction motors. This manufacturing process provides a simple and practical means for large-scale economical production of high-efficiency induction motors. Rotor die casting obstacles/solutio…
This paper aims to describe the characteristics of the radial magnetic forces in a low-speed permanent magnet (PM) machine with concentrated windings. Magnetic flux distribution in the airgap is calculated using finite element method and the results are employed to compute the radial forces using Maxwell's stress tens…
Demagnetization faults are troublesome in permanent magnet synchronous motors since they may greatly reduce their performance and efficiency. Additionally, the temperature of the magnets deeply influences the remanent flux density. Hence, the temperature may have a demagnetization effect on the magnets. This work stud…
In this paper a new model for the estimation of the stator winding and rotor cage temperatures of induction machines is presented. This model can be used in series applications of machines operated under dynamic load conditions where stator and rotor temperature shall be monitored. The proposed model relies on a simpl…
A fatigue peeling test has been developed to evaluate the failure of rubber to rubber interfaces under cyclic loading. Results obtained through this method have been compared to those of a typical fatigue crack growth experiment. The results show that the trends between these two failure modes are similar with the pee…
Abstract Advances in computational lithography over the last 10 years have been instrumental to the continued scaling of semiconductor devices. Competitive scaling requires two types of complementary models: fast predictive empirical models that can be used for pattern correction and verification; rigorous physical mo…
This paper proposes a new detection method of inter-turns short circuit in the stator windings of induction machines. The analysis is focused on the external magnetic field, especially its transverse component. A specific signature is highlighted and explained by an analytical model. The proposed method is reliable, o…
In present investigation, a series of hydrogels, composed with Surfactant and poly(Acrylamide-co-Potassium acrylate), using Ammonium per sulfate(APS)/N,N,N 1 , N 1 -tetram ethylethylene diamine (TMEDA) initiating system and N,N 1-methylenebisacrlyamide (MBA) as crosslinker. The prepared hydrogel was characterized by u…
This paper studies magnet eddy-current losses in permanent magnet (PM) machines with concentrated winding. First of all, space harmonics of magnetomotive force (MMF) and their influence on magnet losses in electrical machines are investigated. Secondly, analytical model of magnet volume losses is developed by studying…
Increasing the TSV aspect ratio is a manufacturable approach to meet the requirements of high density 3D interconnections. A good control on the overall cost of ownership of the 3D interconnections clearly points towards the direction of highly conformal thin film deposition techniques for liner, barrier, and seed pro…
This paper presents a general approach to the optimized design of a series of interior permanent magnet motors with the same lamination cross section. A concept of a referent and particular design has been introduced and analytical expressions which relate the principal machine parameters for the referent and particul…
OBJECTIVE: To analyze the rigidity of a platform-type external fixator assembly, according to different numbers of pins on each clamp. METHODS: Computer simulation on a large-sized Cromus dynamic external fixator (Baumer SA) was performed using a finite element method, in accordance with the standard ASTM F1541. The m…
The present study measured Korean pilots’ facial dimensions to design a pilot oxygen mask which would fit Korean pilots, and compared Korean pilots’ facial dimensions to Korean male civilians and US male pilots’ facial characteristics. The present study selected the 22 facial anthropometric dimensions related to oxyge…
Abstract Owing to the small size, high surface-to-volume ratio, and good biocompatibility, silica nanoparticles (SiNPs) have become the normally used carrier for biomolecule immobilization. Label-based detection techniques have been used extensively for a wide range of applications in biological analysis. Organic dye,…
Titanium dioxide nanoparticles with an average diameter of about 10 nm are fabricated using a sintering method. The degradation of methyl orange indicates that the photocatalytic efficiency is greatly enhanced, which is measured to be 62.81%. Transmission electron microscopy is used to investigate the microstructure o…