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Commonly torque ripple reduction in switched reluctance machines (SRM) is achieved with model predictive control methods, such as hysteresis or pulse width method based direct instantaneous torque control (DITC). This paper discusses the effect and possibilities when reducing the number and size of look-up tables (LUT) necessary to model the SRM in predictive DITC. The goal to only use one look-up...
Modern motor control drives start increasing the use of various optimization techniques to tune the controller because of its accuracy and simplicity. Usually, the classical controllers used in motor control drives are not adaptable to the changes such as parameter variation, voltage unbalances, changes in load etc. So, online control should be encouraged in order to make the system robust. In this...
The modeling and control of a variable speed cascaded doubly fed induction generator feeding an isolated grid in aircraft application is presented. Despite the complexity of the generator an efficient controller can be elaborated based on the theory of a unified reference frame vector representation. An indirect decoupled vector control of terminal voltage is implemented using field orientation techniques...
A model of Mutually Coupled Switched Reluctance Machine (MCSRM) which includes the effect of multiple phase current excitations using a single lookup table is developed. The model can predict the MCSRM flux linkage and electromagnetic torque. The current waveform for low torque ripple is determined with the help of this model. The optimum current waveforms vary with the torque and speed levels. This...
Practical experience has shown that parasitic effects such as rotor eccentricity can have crucial influence on the performance of switched reluctance machines. Strong eccentricity can even be a knock-out criterion as it potentially causes additional acoustic noise and increased bearing wear. Nowadays only very few publications consider simulation methods without online finite-element analysis regarding...
This paper proposes a technique for rapid high fidelity finite element based synchronous machine models for use in system simulators. The computational efficient finite element procedure, CE-FEA, is used to construct harmonic flux linkage arrays for a range of current inputs. In the system simulator, a map is constructed relating rotor position as an input to relate instantaneous flux linkage and...
This paper analyzes the influence of excitation in the experimental determination of flux linkage vs. current vs. position relationship of a switched reluctance motor. Results of the experimental characterization of the SRM in the cases of rectangular bipolar excitation, rectangular unipolar excitation and sinusoidal excitation are compared. An equivalent model of a motor phase including magnetic...
This paper presents a modeling method of Switched Reluctance Motor (SRM) based on the Radial Basis Function (RBF) Neural Networks. By analysing measuring data and nonlinear characteristics of SRM, the modeling of SRM is designed with Gaussion Function. The simulated results show that the proposed model has better capability of generalization and correctly represents the characteristics of SRM compared...
A general simulation model of the line-start single-phase capacitor-start, capacitor-run permanent-magnet motor (LSSPPM) is constructed by using Simulink in MATLAB according to the analysis of its mathematical model. A user-friendly interactive man-machine interface is designed after masking the model. Finally, the validity of the simulation model is tested and verified via a simulation experiment.
In this paper the static (flux linkage and torque) and steady state characteristics (speed, current and torque) of the switched reluctance motor (SRM) is investigated for four magnetic structures with various combinations of stator and rotor poles: 8/6 (basic configuration), 16/12 (‘double poles’ configuration), 16/14 and 16/18 (‘toothed poles’ configurations). The static characteristics are calculated...
Three phase induction motors are continuing to remain as work horses in industrial applications. The accurate behavioral modeling of induction motor helps in designing controller for the machine and also useful in detection of faults in machines. Almost all faults in the induction motor affect the flux in the air gap. These fluxes can be measured virtually using dq model of induction motor by feeding...
The steady-state performance of a type of three-phase flux-switching synchronous motor employing a segmented-rotor and wound-field excitation is investigated using the standard dq model for three phase AC machines. The unconventional topology of the motor presents significant departure from the basic assumptions of the dq theory, even though the motor may be operated from a drive incorporating generic...
In this paper, on the basis of vector control, Extended Kalman Filter (EKF) was employed to estimate stator winding resistance, rotor flux-linkage due to permanent magnet and temperature rise in stator winding and rotor magnet of AC PMSM. Identification model of different parameter was established in rotating reference frame and MATLAB/SIMULINK was used to do simulation experiments. The theoretical...
With the aim to significantly reduce fuel consumption and exhaust emission, hybrid electric vehicles (HEVs) are more and more developed. Among the different architecture, series-parallel HEVs have flexible mode operations and high efficiency. There are two basic kinds of series- parallel HEVs, one uses a planetary gear, and another uses two concentric arranged electric machines or one machine with...
The electric variable transmission (EVT) is an electromechanical converter with two mechanical ports and one electrical port (consisting of two concentric machines and two inverters) which is suitably for applications in hybrid electric vehicle. This paper is focused on an EVT hybrid vehicle modeling and its control structure. EMR (Energetic Macroscopic Representation) is used to the global modeling...
The accuracy of flux linkage-current-position curves has vital importance for designing SR motors. Analytical prediction of these curves is very difficult and as shown in this paper 2D approach leads to erroneous prediction of the flux linkage curves and hence significant errors in performance prediction of SR motors. This paper makes an important contribution to the design process by developing an...
The nonlinear Psi -i-characteristic is crucial for the design of switched reluctance machines (SRM). There are many different models how to calculate the Psi -i-characteristic. Some of these calculations are based on complex models of the magnetic circuit and some are based on functions needing a fitting procedure. When proceeding with curve fitting methods, measured data or data achieved by FEM-calculation...
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