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This paper presents a speed-sensorless control algorithm for induction motors, based on the stator flux-oriented control. The algorithm has the advantage of insensitivity to rotor parameters and load varying, stator flux and rotor speed is closed loop controlled respectively. The main improvement is that stator flux is estimated based on a modified integrator which is developed to solve the problems...
This paper presents the design and optimisation of a very high quality (Q) factor inductor using MEMS technology for 10 GHz to 20 GHz frequency band. The effects of various parameters of a symmetric inductor structure on the Q-factor and inductance are thoroughly analysed. The inductor has been designed on silicon-on-sapphire (SOS) substrate because it offers superior characteristics of low substrate...
Enhanced analytical equations are derived to predict the inductance and series resistance of a common active inductor configuration. The equations, based on MOSFET small-signal parameters, are used to predict the inductance and series resistance of an active inductor implemented in a 0.18 ??m CMOS process. The inductor's characteristics are presented, demonstrating analytical equation accuracy and...
As operating frequencies increase in state-of-the-art wireless designs, highly accurate modelling of critical interconnect paths routed over silicon is crucial for first-pass design success [1]. With this in mind, the interconnect stack of an IBM silicon germanium (SiGe) process incorporating a TSV ground supply network was modelled with model accuracy and efficiency as the goals. A unique modelling...
This paper uses multi-conductor transmission line (MTL) to model transformer windings. According to the symmetry of windings, a 2D equivalent finite element model can be set up under ANSYS environment. On the basis, finite element method (FEM) is used to calculate the distributed parameters in transformer windings. In the process of calculation, the skin effect is focused on. The frequency-dependent...
The paper detail analyzes the relationship between position phase error and free-wheel current of inactive phase. It is found that free-wheel current error can exactly reflect position phase error, and a novel closed loop control method to correct position phase is proposed. In order to keep free-wheel current of the inactive phase symmetrical, free-wheel current error is inputted to PI controller,...
In many factors affecting rail-gunpsilas launching efficiency, magnetic energy stored in rail inductance and joule heat consumed in rail resistance are the key. To reduce magnetic energy loss, the mathematical expressions for rail-gun such as electromagnetic force, launching efficiency and breech voltage are given, and the relation between current waveform and launching efficiency is found. Theoretical...
A new approach employing the circuit analysis theory instead of electromagnetic field theory is presented to calculate the rotor resistances and inductances of single-phase induction motors. The resistance and inductance parameters are obtained at positive sequence and negative sequence frequencies, respectively, with skin effect consideration. The rotor bar is divided into many thin-layers with their...
The skin effect of rotor current is one of key factors which affect the simulation accuracy of three-phase induction motors with deep rotor bars. This paper proposes an improved dynamic model considering the skin effect of three-phase induction motors at arbitrary operation, from the starting to rated-load operation. The simulation results using the proposed model are compared with those from the...
There are demands for very large KVA switched reluctance drives (SRD) for many applications. However, one of the key issues is to ensure that the current and voltage capabilities of IGBTs are enough to safely transfer the power from the supply to the SRM. This paper extends the snubber topology of full bridge circuit to the asymmetric bridge circuit of SRDs, proposes and evaluates three different...
The work presents a study of the quantification of the parameterspsila variation caused by applying interleaving techniques in high-frequency transformers. The paper concerns prediction of the effect of interleaving techniques between different layers (interlayer )and in the same layer (intra-layer). Two coefficients had been obtained to respectively show the variation rule of AC resistance and leakage...
The eddy current proximity sensor or probe is composed of exciting winding, detection winding and post processing circuit. Models of the key structural and electromagnetic parameters of the sensor are analyzed. The mutual influence characteristics induced by the structural and electromagnetic parameters are provided accordingly. The pull up resistor used to improve the reliability of the sensor will...
The authors develop the squirrel cage induction machine model for the diagnosis of defects from an approach of magnetically coupled multiple circuits. The generalized model is established on the base of mathematical recurrences. The winding function theory is used for determining the rotor resistances and the inductances in the case of n-broken bars and broken end-ring. Simulation results, in Part...
Summary form only given. Surge tests were performed to derive a generator model considering its frequency characteristics. Impulse voltages were applied to one terminal of the generators after placing a variable capacitor at the same terminal. The inductances and the core-loss resistances of a generator model can be determined from the measured oscillating voltages. This paper presents a generalization...
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