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Spindles, key components of a spinning frame, are also the symbol of textile industry. Its dynamic performance directly affects the quality and yield of yarn [1]. At present, the spindle, up to 25000 rpm, belongs to high speed of rotors. In the process of work, it has to face the vibration problem, which is the main reason that spindle cannot speed up and broken yarn.
There have been increasing research activities on organic spintronics, due to the long spin relaxation time in organic semiconductors which allows retaining the spin information. Generally, the widely used organic semiconductors are tris-(8, hydroxyquinoline) aluminum (Alq3), oleic acid, poly (3-hexyl thiophene)(RRP3HT), etc. Recently, the inorganic-organic perovskite family of materials taking the...
Surface-functionalized superparamagnetic (SPM) beads have been widely used to detect and manipulate chemical and biological agents in lab-on-a-chip systems. Recently, it has been shown that by exploiting the stray field generated by domain walls in magnetic nanostructures, it is possible to capture and couple a SPM bead to a domain wall [1]. To store the captured bead, the domain walls can be pinned...
In order to achieve the application of FePt based films, great progresses have been made in the fabrication of granular FePt thin films using MgO or TiN underlayer/intermediate layers. However, the MgO intermediate layer possessing small surface energy led to large opening-up in the in-plane hysteresis loop while the TiN intermediate layer possessing large surface energy caused the formation of the...
A temperature to digital converter (TDC) that does not require either a reference generator or an ADC and that exhibits low supply sensitivity, small die area, and low power consumption is introduced. A prototype circuit designed to support power management applications over the [60 °C, 90 °C] temperature range was implemented in an IBM 0.13μm CMOS process with a 1.2V power supply for use as either...
A significant advantage of spoke-type interior permanent magnet (IPM) machines is the flux concentration effect of adjacent PMs, which enhances the air-gap flux density and the output capability. However, the leakage flux around the rotor inner circumference is difficult to reduce [1]-[2]. In order to ease the manufacturing process, a spoke-type IPM rotor with alternate airspace-barriers is proposed...
Non-oriented Silicon Steel is widely utilized as main core materials for electromechanical equipment, such as motors and generators used in civil power system, because of their attractive characteristics of high magnetic saturation point, good mechanical strength, little anisotropy, and low cost. But in the special cases of modern all electric ship (AES) [1], due to strict requirement on weight and...
The shingled magnetic recording (SMR) is considered to be a practical way to increase the areal densities (AD) to multi-Tera-bit/in2 (Tb/in2) on conventional media [1]. Increasing the linear density and track density achieves higher AD, and erase band width (EBW) is one of the factors that affect track density [2]. However the erase band noise will be enhanced under the impact of the skew and corner...
In this papera novel magnetically compounding propulsion motor(MCPM) is studied. The main characteristic of the motor is that it is composed of a high speed rotor and a low speed rotor, and it can be output a large torque at a low speed through the modulation of ferromagnetic pole pieces with the function which can reduce the speed and enhance the torque. The operating principle of the motor is discussed...
Stator wound field synchronous (SWFS) machine has the advantages of low material cost and easy thermal management. For the SWFS machines, the non-overlapping windings can be employed to reduce the copper usages and manufacture costs. In [1], a segmental-rotor non-overlapping SWFS (SNSWFS) machine is proposed, Fig.1(a). However, the segmental rotor is not robust and not easy for fabrication. Besides,...
Magnetic tunnel junctions (MTJ) having a MgO barrier are envisioned for many important applications including magnetoresistive random access memory, hard disk read heads and magnetic sensors. Because of their high Curie temperatures, large spin polarization and small magnetic damping, half-metallic Heusler alloys integrated into MTJs may be optimal for use in low power and high output spin-electronic...
In this work, silicon nitride (SiNx) film deposited at 780 °C by low pressure chemical vapor deposition (LPCVD) was employed as the passivation layer and gate dielectric for GaN-based MIS-HEMTs. The LPCVD-SiNx/AlGaN/GaN MIS-HEMTs exhibit suppressed current collapse, small gate leakage current at both reverse and forward gate bias, high forward gate breakdown voltage and high time dependent gate dielectric...
We report normally-off Al2O3/AlGaN/GaN metal-isolator-semiconductor high-electron-mobility transistor (MIS-HEMT) with improved thermal stability in DC and dynamic performance. The MIS-HEMTs featuring a partially recessed (Al)GaN barrier were realized by a fluorine-plasma implantation/etch technique. Both the well-controlled slow dry etching for gate recess and implanting fluorine ions into the AlGaN...
In this work, by using an on-chip Schottky-on-heterojunction light-emitting diode (SoH-LED) which is seamlessly integrated with the AlGaN/GaN high electron mobility transistor (HEMT), we studied the effect of on-chip light illumination on the de-trapping processes of electrons from both surface and bulk traps. Surface trapping was generated by applying OFF-state drain bias stress, while bulk trapping...
This paper proposes a new approach for detecting and isolating faults in a non-linear dynamic process using the multiple model approach. The necessary conditions for the assignability of eigenvalues to a region in the s-plane and the necessary conditions to guarantee the stability of fuzzy models for Takagi-Sugeno (T-S) fuzzy observers are derived. The paper is structured in two stages. The first...
This paper presents a new approach to the design of a robust observer-based fault detection scheme for diagnosing incipient faults, called the H∞/ μ robust fault detection observer (RFDO) which takes into account of the robustness against disturbances and sensitivity to faults simultaneously. The approach has originated from the robust H∞/ μ estimator which minimises the effect of disturbance on the...
This paper presents a self-powered wireless temperature sensor powered with a micro piezoelectric energy harvester. The piezoelectric energy harvester is a cantilever beam design fabricated with metal-MEMS process on stainless steel substrates. The energy harvester is tuned to have resonant frequency around 120Hz and the bimorph version can generate more than 400µW power output when driven with vibration...
This paper discusses an approach to robust control law design for fault-tolerant systems. Based on the assumption that the effects of faults can be expressed in Linear-Fractional-Transformation (LFT) forms, a fault-tolerant control systems design problem is formulated and solved via a linear matrix inequality (LMI)-based synthesis approach, to recover the convexity of the design problem whilst considering...
In this paper, a lead frame package with trace routing capability is proposed for advanced QFN package that has copper traces to connect with pads or dies, called routable aQFN package. Four packages were conducted to evaluate the trace routing capability. The first is wire bond type 11 mm ×11 mm 141 I/Os package with trace fan-out designs. The second is wire bond type 3.2 mm × 3.2 mm 48 I/Os package...
This paper describes a compartment shielding process which is suitable for a system module which needs multiple shielded areas to reduce the interference among digital, analog and RF circuits. The process to implement this compartment shielding is ideal for integrating die or wafer level package, and results in miniaturized form factory both in area and in height. The compartment shielding structure...
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