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Recently, permanent magnet (PM)-brushless direct current motors (BLDCMs) have been widely used in high-performance motor drive applications, thanks to their many attractive advantages, such as higher power and torque density and efficiency, simpler motor assembly and maintenance, lower cost, acoustic noise, and vibration. However, due to cost increase rapidly and restricted exploitation of rare earth...
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.
MTJ current sensors have broad prospects in the large scale distributed monitoring of the smart grid. In this paper, we researched the design and optimization of magnetic ring for MTJ current sensors to suppress the susceptibility of the spatial position. The specific improvement and parameters of magnetic ring were also researched.
MnTe is a kind of antiferromagnetic semiconductor with Néel temperature (TN) of 307 K [1]. Mn1−xCrxTe was investigated as diluted magnetic semiconductor [2]. The structure, magnetic and transport properties of MnTe [3] and Mn1−xCrxTe [4,5] films were investigated. In these previous works, some of the films represent different characteristic from the bulk ones, such as ferromag-netism at room temperature...
Tamping machine is one of the pivotal devices for coking plants. Most tamping machines are still driven by rotatory electric motors, through mechanical transmission components, leading to low energy efficiency, slow working frequency and huge maintenance fees. In fact the tamping machine can be directly driven by linear motors as shown in Fig.1. Directly driven system will be simpler with higher working...
Spin-orbit interaction generated spin torque provides a new writing mechanism for spintronics memory devices [1][2][3][4]. This presentation addresses a broad question of how to design spintronics memory devices for match-in-space, content addressable applications utilizing spin-orbit interaction generated spin torque combined with conventional spin torque generated by magnetization polarization....
Traditional spin transfer torque MRAM (STT-MRAM) uses one transistor and one MTJ (1T-1MTJ) architecture, where the transistor provides bi-polar currents to switch the magnetization of the free layer of the MTJ. Due to the limitation of the maximum current that is available from a typical transistor, for a MTJ device with required thermal stability and data retention at extreme densities, the size...
Taking a squirrel-cage induction motor Y802-2 as an example, 3D fluid field and thermal field of the motor operating in normal and broken bar fault conditions are researched in this paper. Considering the ventilation structure and heat transfer characteristics of the motor, the inner and outer fluid space and 3D finite element structure model of the motor operating in the healthy state, one broken...
With the increasing problems of emission from oil/gas powered vehicles and the decreasing of fossil fuel around the world, the electric vehicles (EV) and hybrid electric vehicles (HEV) have gained wide attention. Among them, the internal combustion (IC) engine and the electric machine based HEV become the most promising alternatives for the next generation vehicles [1]. The HEV provides the advantages...
We will present high performance/low-cost spin transfer torque magnetic random access memory (STT-MRAM) solution based upon 64Mb chip data and scalable magnetic tunneling junction (MTJ) BEOL integration scheme at 55 nm process node. This is the first fully functional STT-MRAM chip fabricated in a top tier foundry using the standard 300 mm CMOS foundry process. We will characterize pMTJ device population...
When high voltage direct current (HVDC) system is under the monopolar operation mode, huge direct current (DC) is injected into the earth through the DC grounding electrode, which will result in earth potential changes in a wide range of area. In this case, DC will be coupled into the nearby alternating current (AC) power grid and have some bad influences, called DC bias phenomenon, on the measuring...
With the rapid development of science and technology, the demands for miniaturization, integration and high frequency of the electromagnetic devices were steadily increased. The integrated inductor is an important passive component for RF devices such as power transformers, amplifiers and oscillators. However, the performance of on-chip integrated inductors was poor when operating in GHz band. It...
The heat management bottleneck drives the search for alternative approaches for energy-efficient information technologies. Temporal and spatial magnetic spin textures are of great interest, since their dynamics can occur with minimal dissipation. Typical examples include spin waves (magnons), which are the fundamental quasi-particle excitations of magnetically ordered systems, and skyrmions, which...
As the CMOS technology scales down, the leakage power becomes a critical barrier for high-performance processors. In addition, the separated processor and storage units in the classic Von-Neumann architecture limit the development of advanced computer design. Spintronics is an emerging platform for nonvolatile memory and logic circuit designs [1-2]. The nonvolatility of spintronics can reduce greatly...
Current-induced spin-transfer torque (STT) is a mainstream method of switching the magnetization of free layer of magnetic tunnel junctions (MTJs) [1-2]. However, currently STT-MTJ is suffering from speed and energy bottlenecks caused by two tradeoffs: firstly, since the critical write current (Ic0) is proportional to the thermal stability barrier (Δ), it is difficult to reduce Ic0 without decreasing...
Soft magnetic alloys have been widely applied to modern technology devices, such as transformer cores, choke coils and inductive devices. Magnetic field annealing can induce an uniaxial magnetic anisotropy Ku [1-4] so as to improve the soft magnetic properties of alloys for the purpose of coping with different application requirements. So far, FeCo-based nanocrystalline alloys have been explored increasingly...
Finemet alloys exhibit superior soft magnetic properties with high initial permeability (μ), low coercivity and low core loss, which attracted a great deal of attention [1]. However, their application is limited to the temperature close to the Curie point of an amorphous matrix, Tcam, because the intergranular magnetic coupling is usually interrupted by the paramagnetic amorphous matrix. As the result,...
Ferromagnetic electrodes with perpendicular magnetic anisotropy (PMA) have been extensively studied because of the outstanding performance in applications. [1] To obtain high tunneling magnetoresistance (TMR), researchers have put efforts to realize PMA with Co-based full-Heusler alloy films with MgO barrier. However, the lattice mismatch between MgO and full-Heusler alloy leads to a rapid TMR reduction...
Binary information encoded within the spin of carriers can be transferred into corresponding right or left-handed circularly polarized photons emitted from an active semiconductor medium via carrier-photon angular momentum conversion. In order to attain maximized spin-injection at out-of-plane magnetic remanence, a number of material systems have been explored as possible solid-state spin injectors...
The DC-biased magnetization is often occurring in electromagnetic devices running process, such as the power transformer, iron core reactor and other high-voltage electrical equipment [1]. However, There are three main kinds of traditional offline measuring methods under dc-biased magnetization: Epstein Frame, Ring Test and Single Sheet Measurement. The important limitation of the three aforementioned...
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