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In more electric aircraft (MEA), supplying constant voltage variable frequency (CWF) AC power to frequency insensitive loads (eg. wing de-icing system, galleys, etc.) in DC primary distribution system requires an AC-DC-AC conversion which adds losses and additional hardware installment to the system. This paper presents a novel open-end winding induction generation system supplying CWF AC power for...
The steady state operating curves of three design variants of a five-phase induction machine are assessed and compared to a standard three-phase induction machine of the same size which is taken as the basis for the comparison. The performance in terms of torque, power factor, stator current and efficiency are analyzed for different load conditions. The operating curves are determined by means of...
Design studies for a 10 MW superconducting wind generator have been performed for offshore wind turbine applications. Electromagnetic, mechanical and thermal analyses are performed by taking into account the characteristic properties of the superconducting and non-superconducting materials. The investigations use enhanced YBCO (Yttrium Barium Copper Oxide) second generation (2G) high temperature superconducting...
This paper deals with the measurements and parameters determination of a stator thermal model suitable to predict the winding thermal behavior during short-time thermal transient. A possible application of the proposed first order thermal network is the overcurrent limit prediction in electrical drives. Initially, a detailed description of the thermal model is reported with a deep discussion about...
A helical motor is an axial gap helical motor with a stator that consists of windings and teeth made of soft magnetic composite. The teeth of a previously developed helical motor were of low precision owing to the manufacturing method. The low-precision teeth affected the motor performance negatively. In this study, we proposed a new type of a helical motor with high-precision teeth; furthermore,...
In this paper, high bandwidth current control for an open-end winding induction motor is realized with deadbeat control. A deadbeat current controller achieves higher gain than a PI current controller by compensating for the error caused by the digital sampling delay. The response of a deadbeat controller is directly influenced by its sampling frequency, while that of PI controller depends on gain...
This paper proposes a Takagi-Sugeno neurofuzzy inference system for direct torque and stator reactive power control applied to a doubly fed induction motor (DFIM). The control variables (d-axis and q-axis rotor voltages) are determined through a control system composed by a neuro-fuzzy inference system and a first order Takagi-Sugeno fuzzy logic controller. Experimental results are presented to validate...
It is well-known that in the area of encoderless control methods for AC-drives a single approach is not capable to cover all speed ranges and all types of machines. Therefore, a combination of several methods is necessary. Especially in the case of electrically excited synchronous machines, the methods proposed for the low speed region and for the detection of the initial rotor position fail for many...
A unique formation of model reference adaptive reference (MRAS) using, active power (P), reactive power (Q) and fictitious quantities (X and Y) as the functional candidates is presented. The formulation of MRAS in the proposed form has the advantage that, no machine parameters are involved, except the rotor resistance. The reference and adjustable model of modified MRAS are computed in rotating reference...
Sensorless field oriented control (FOC) strategies have found their place in industry applications during the last few years. Stimulated by this development scientific research continues to improve their performance, which is directly linked to the estimation accuracy of flux and rotor position without a mechanical sensor by means of high frequency or transient excitation. The influence of induction...
Sensorless position estimation based on signal-injection methods always requires a resistance- or inductance-based anisotropy. One way to influence the differential inductances of an electrical machine is the use of a short-circuited electrical winding on the rotor surface. This method is applied to an interior permanent magnet (TPM) machine in this paper. In order to investigate the suitability of...
The sensorless control technology is widely adopted for various applications. In this paper, a novel sensorless control based on coordinate transformation is proposed for doubly salient electromagnetic machine (DSEM). Based on the characteristics of the back electromotive force (EMF), the rotor position signals would be constructed. In order to acquire the commutation instant accurately, two different...
A small size flux-switching permanent magnet machine is designed by means of finite element analysis having a concentrated toroidal winding in the stator and a large air-gap. The design concept is compared to a C-core flux-switching machine having the same magnet volume. Simulation shows that the electromagnetic performance of the toroidal wound FSPM is lower in the first place because of the different...
The aim of this paper is to develop a six phase induction machine (6PEVI) model suitable for the simulation of this machine in any system with control circuits and/or connections to the grid by means of power electronics converters. The circuit-oriented approach has been chosen in order to represent the 6PIM model as a rotating transformer. In fact, a class of universal machine model has been built...
This paper presents a new online diagnostic approach for the detection of stator and rotor inter-turn short circuit (ITSC) faults in doubly-fed induction generators (DFIGs) for wind power applications. The proposed technique is based on the Fast Fourier Transform (FFT) of the instantaneous stator reactive power. It is shown that stator and rotor ITSC faults in the DFIG can be reliably detected by...
Online condition monitoring is a crucial task for wind turbine generators availability and reliability enhancement and leads to an early electrical and mechanical faults detection which can reduce the maintenance cost and avoids catastrophic failures. The performance of any condition monitoring system should be evaluated before its installation on an actual full-scale system. Therefore, the design...
This paper presents a new control topology to reduce the effect of the fifth negative and seventh positive voltages harmonic in the Doubly Fed Induction Generator (DFIG) in wind power systems. The proposed control is based on the concept of active power filters. A rotor current is delivered in the opposite direction of the harmonic content to reduces its effect. A incremental fuzzy controller is used...
Model predictive control algorithms have recently gained more importance in the field of power electronics and motor drives. One of the important categories of model predictive control methods is improved deadbeat control in which the reverse system model is used to calculate the appropriate inputs for the next iteration of controlling process. In this paper, a new improved deadbeat algorithm is proposed...
This paper proposes a novel single layer winding layout for a permanent magnet machine with improved torque density for electric vehicle applications. In this paper, two permanent-magnet (PM) machines with outer rotors and single layer fractional slot concentrated windings are compared based on two different slot/pole combinations, namely 20 slots/18 poles and 20 slots/22 poles. The two machines are...
Compared with wye-connected winding machine, the delta-connected shows merits in wider constant power speed range (CPSR) and higher efficiency because of the full utilization of terminal voltage, which is promising for electric vehicles (EVs), industries and domestic appliances, etc. However, circulating loss caused by triple-order harmonics impedes the application of delta-connected winding in permanent...
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