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This paper first developed magnetic reluctance models for magnetic inductors. The near magnetic field emission of the inductors with different winding and air gap configurations are analyzed based on the developed models. Several inductor structures are proposed to reduce the near magnetic field emission. Simulation and experiments are conducted to validate the developed techniques.
The paper investigates the near magnetic field performance of integrated CM and DM inductors. The reluctance model is developed for near magnetic field analysis. Based on the analysis, several integrated inductor structures using commercial EE/EI cores to achieve low near magnetic field emission are proposed. Simulations and experiments were conducted to verify the proposed inductor structures.
Most of magnetic encoder ICs are on-axis, and they are generally suitable for inner rotor PMSM, sometimes used in external rotor PMSM. However, in some special occasions, these ICs are not used for the difficulty of mounting, for example, there is an external rotor PMSM with a hollow shaft, which is convenient for passing the control wire. It is difficult to mount these encoder ICs, because there...
According to the requirement of the power factor and the dynamic performance of the asynchronous machine tool field, an asynchronous motor inverter with active power factor correction is proposed. The proposed inverter is a 3kW asynchronous motor drive control platform. At first, the proposed single phase converter with APFC is realized by using the MATLAB/SIMULINK. Then, the boost APFC is designed...
A fault-tolerance control method for an open-winding multi-disc motor capable of being used in wide speed range applications is designed and introduced. The open-winding method is proven to be effective in field weakening to enhance high speed performance. But the dual inverter may increase the chance of hardware function failure. No additional hardware is required to realize the control method. By...
Magnetic encoder based on giant magnetoresistance effect, also known as GMR-based magnetic encoder, has several distinct advantages over the traditional Hall-effect magnetic encoder such as its simpler structure, higher resolution and sensitivity as well as a better tolerance toward extreme working environment. This paper gives a detail design scheme of a GMR-based magnetic encoder. Finite element...
In this paper, a 5kW novel multistage axial-flux permanent magnet machine (M-AFPM) is analyzed. As a key part of the machine, stator core of silicon steel and SMC are studied by 3D finite element method (FEM) respectively. No-load, full-load, magnetic field distribution, core loss, etc. are calculated. FEM result indicates that SMC-materials have almost equal influence on EMF, magnetic field distribution...
This paper proposes a sensorless field-oriented control(FOC) strategy for Surface-mount Permanent Magnet Synchronous Motor(SPMSM). Firstly, a rotor flux estimation method with a high pass filter is introduced. Secondly, the basic principle of PLL and PI parameters tuning method derivation are demonstrated. And then, the compensation method for the phase shift caused by the high pass filter has been...
Building extraction from remote sensing images is a longstanding topic in land use analysis and applications of remote sensing. Variations in shape and appearance of buildings, occlusions and other unpredictable factors increase the hardness of automatic building extraction. Numerous methods have been proposed during the last several decays, but most of these works are task oriented and lack of generalization...
Chronic disease is a class of diseases which seriously threatens the health of our residents, it has become a major public health problem affecting the economic and social development of the country. And these chronic diseases are mostly old age diseases, age is an important risk factor. In this paper, we construct four double well basic functions, and aim at minimizing the segmental fitting error,...
In [1], a sharp phase transition has been numerically observed when a constrained convex procedure is used to solve the corrupted sensing problem. In this paper, we present a theoretical analysis for this phenomenon. Specifically, we establish the threshold below which this convex procedure fails to recover signal and corruption with high probability. Together with the work in [1], we prove that a...
In this paper, the secrecy outage performance of an underlay cognitive decode-and-forward (DF) relay network over independent and non-identical distributed (i.n.i.d) Nakagami-m fading channels is investigated, in which the secondary user transmitter communicates with the secondary destination via relays, and an eavesdropper attempts to overhear the information. We assume that the channel state information...
Inductive Power Transfer (IPT) system makes use of high frequency inverter and resonant compensation network to transmit power without any electric contact, which makes power transfer more convenient and safer. IPT system is a high order and nonlinear system, modeling and analysis of such a system is complicated because its state variables like inductor currents and capacitor voltages present rapid...
In conjugation with the method of moments, the Bayesian compressive sensing algorithm is utilized to fast analyze the monostatic electromagnetic scattering problem. Different from the orthogonal matching pursuit based compressive sensing approach that cannot determine the required measurement times, the proposed method overcomes the difficulty by adopting the Bayesian framework to recover the underlying...
The reduction of common mode (CM) noise for isolated converters has been a popular research topic. This paper proposed a generalized two-capacitor modeling technique for switching transformers with multiple windings and complicated winding structures. Based on the proposed model, a Flyback transformer with multiple winding structures is investigated. A new measurement technique to characterize and...
This work presents a novel transient field-circuit simulation method based on the time-domain integral equation (TDIE) and circuit macromodels. The traditional field-circuit simulation method constructs the Kirchoff's equations for lumped circuits with SPICE models, but they cannot handle problems with unknown circuit structures. The proposed method creates parametric macromodels to represent the...
This paper considers underlay multiple-input multiple-output cognitive radio networks including a primary transmitter, a primary receiver, a secondary source, a secondary destination, and an eavesdropper, where the secondary transmitter is powered by renewable energy that is harvested from the primary transmitter in order to improve both energy efficiency and spectral efficiency. It is assumed that...
Stochastic Gradient Descent (SGD) is a popular technique for solving large-scale machine learning problems. In order to parallelize SGD on multi-core machines, asynchronous SGD (Hogwild!) has been proposed, where each core updates a global model vector stored in a shared memory simultaneously, without using explicit locks. We show that the scalability of Hogwild! on modern multi-socket CPUs is severely...
Solving L2-regularized empirical risk minimization (e.g., linear SVMs and logistic regression) using multiple cores has become an important research topic. Among all the existing algorithms, Parallel ASynchronous Stochastic dual Co-Ordinate DEscent (PASSCoDe) demonstrates superior performance compared with other methods. Although PASSCoDe is fast when it converges, the algorithm has been observed...
Two kinds of image encryption algorithms based on a three-dimensional chaotic system is presented in this paper. Firstly, a new three-dimensional chaotic circuit based on memristor is designed, and the characteristics of the chaotic system are studied. Secondly, we present two kinds of images encryption algorithms based on the chaotic sequences above, and by doing theoretical and statistical analysis,...
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