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Linear induction motor (LIM) drive suffers heavily from low efficiency due to its large air-gap length, the end-effects, and the partial load working conditions. Therefore, an optimization method is proposed in this paper to improve the LIM drive operating efficiency from both design and control levels. First, the genetic algorithm (GA) is applied to design optimization of LIM to attain higher efficiency...
A novel brushless hybrid-excitation axial flux machine (BHAFM) is investigated in this paper. It is designed for electric vehicle which requires the ability of wide speed range and high starting torque of machine. Adopting the special structure of claw poles, BHAFM realizes the function of hybrid-excitation without brush and slip ring. Meanwhile, contrasted with traditional permanent magnet synchronous...
Higher density, tighter margin and lower cost power solutions for the cutting edge datacenter require more characterization of voltage regulator (VR) beyond its power conversion performance such as voltage ratio and efficiency. Fast transient, ground noise sharing and high frequency switching noises coupling to high speed IO are some of the technical aspects that need to be predicted and designed...
We conduct a systematic scaling analysis of the sensitivity of a silicon capacitive MEMS microphone based on a dimensionless 1-degree-of-freedom (1DOF) model considering residual stress. The theoretical normalized sensitivity we derived is a nonlinear function of normalized diaphragm size (h/a), acoustic driving frequency, 3 effective stiffness terms and the other parameters. From our 1DOF model,...
Due to the particular structure of single-sided linear induction motors (SLIMs), e.g. cut-open magnetic circuit, difference between primary and secondary width, they suffer heavily from longitudinal end-effect and transversal edge-effect. Consequently the secondary flux linkage, secondary resistance and thrust are deteriorated, which would increase the copper loss, thrust ripple, and decrease the...
Switching voltage regulator (VR) modeling has numerous advantages over the conventional state average VR modeling methodology, in terms of accuracy, functionality, tuning capability, and extended applications on EMI. In previous work, switching VR modeling based on Pspice was discussed [1]. However, it is fairly accurate with simulation time limited by circuit complexity and often results in convergence...
High performance computing (HPC) platform power delivery simulation is typically based on state average mode for simplicity. However, it is not able to capture the dynamic ripple noise and non-linear effect of output voltages, as well as the phase information. The correlation between state average model and lab measurement often lacks accuracy in low to middle frequency range. As a result, platform...
Doubly-fed induction generator (DFIG) is one of important drive systems for wind turbine. It has been widely applied in the power grid today because of its less losses and simpler control strategies. Meanwhile, during voltage dips, the DFIG kept connecting with the grid can provide some reactive power so as to recover the grid voltage, which is called the ability of low voltage ride-through (LVRT)...
This paper proposes a new rotor (also called secondary) field oriented control model of linear induction machine (LIM) based on a fuzzy self-adapting PI controller which mainly considers the influence of longitudinal end effect. Because the conventional PI controller's parameters cannot be adjusted by itself, it is not very suitable to ever changeful situations especially influenced by non-linear...
The derivation of the equivalent circuit for a single-sided linear induction motor (SLIM) is not straightforward. Especially if it includes longitudinal end effects from the cut-open primary magnetic path, transverse edge effects from the differing widths between the primary lamination and secondary sheet, and half filled primary slots. This paper proposes an improved series equivalent circuit for...
Based on magnetic circuit complex power method, through analyzing linear induction motor two dimensional magnetic flux density equations, this paper achieves T model equivalent circuit considering end effects, primary half filled slots, yoke magnetic saturation and back iron resistance. The method uses four coefficients to describe influence on mutual inductance and secondary resistance brought by...
Winding function method is adopted in this paper basing on air-gap magnetic flux density equations, and a new equivalent circuit is presented so as to analyze single linear induction motor (SLIM) applied in linear metro. Steady and dynamic performances of SLIM can be predicted by this circuit considering end effects, half filled slots, saturated iron and skin effect. To begin with, dynamic situation...
According to the characteristic analysis of lithium-ion power battery, battery accelerate life test is carried out to obtain the relevant conclusions such as the changing trend of battery ohmic resistance in different conditions. Battery ohmic resistance is consequently set up as the Evaluation Index of lifetime. Battery ohmic resistance equivalent model is established aiming at the real-time identification...
This paper adopts winding function method in linear induction motor performance study and presents a new equivalent circuit. It can predict stable and transient performances considering end effects, half filled slots, saturated iron and skin effect. Furthermore, the model is able to analyze different working states considering various control schemes, such as scalar control, vector control, direct...
Single sided linear induction motor (SLIM) has good direct drive ability though its efficiency is poor compared with the rotary counterpart. The motor model including iron loss under synchronous coordination is established and the variable loss function is derived in the paper. In the proposed equivalent circuit model of SLIM, to consider the influence of primary leakage inductance on loss calculation,...
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