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This paper concerns the decomposition and control of the torque produced by an iron core linear permanent magnet motor. The proposed method is based on the dq0-decomposition of the three-phase currents using Park's transformation. The torque is decomposed into a reluctance component and two electromagnetic components which depend on the d- and q-axis currents. By curve fitting a harmonic model on...
In this paper, a novel double-sided design of a 3υ permanent magnet flux-switching linear synchronous machine (FSLSM) with a yokeless translator is proposed. When compared to conventional flux-switching linear machines, it is found that the proposed design can achieve 56% higher thrust without compromising other features of the conventional flux-switching motor. The proposed design also exhibits excellent...
In the paper a switched reluctance rotary-linear motor is proposed and investigated. It is mechanically robust, simple to construct and easy to operate also in hostile industrial and automotive environment. The stator is built up modularly from correctly shifted three usual 8 poles switched reluctance motor stators. The mover is constructed of several common 6 poles SRM rotor stacks. The motor is...
High levels of torque pulsation and radial vibration continues to be the most impeding factor in application of switched reluctance machines in a wide range of products. Most of the efforts done to the extent of mitigation of these effects have resulted in reduction of efficiency or torque density of the SRM. Active mitigation of vibration is considered as a viable technique in which the typical deficiencies...
High grade torque control in Switched Reluctance Motors (SRM) is a key element in successful integration of this family of adjustable speed motor drives in automotive applications. Mitigation of torque pulsation in SRM drives using optimization of phase currents which are obtained from Finite Element (FE) analysis has been attempted in the past. However, long computation time of FE analysis prohibits...
A linear tubular switched reluctance motor is presented. This actuator is devoted to be used as a left ventricular assist device (LVAD). In order to avoid thrombosis, this actuator includes pump and valve functions. By using a St. Jude Medical mechanical valve inside the tubular mover, a pulsatile flow is created in the descending aorta. A linear model of a basic pattern of the actuator based on a...
Accurate assessment of excitation forces and vibration behavior is essential to arrive at a suitable design of an electrical machine. From the vibration point of view, the stator of an electrical machine can be modeled as a system consisting of a number of masses interconnected by springs and damping elements to facilitate the analytical solution of the dynamic behavior of the structure. The authors...
Coordinate Rotation Digital Computer (CORDIC) is usually used to obtain the angle information without any multiply and division operations. The extended electromotive force (extended-EMF) in the literature shows that the angle error between the rotor reference frame and the assumed reference frame can be estimated from an arctangent function and a division. In this paper, the sensorless control for...
In this paper a high torque double-stator switched reluctance machine (DSSRM) is proposed for electric vehicle propulsion. DSSRM is a novel variable reluctance synchronous machine with two stators and one rotor. The magneto-motive force (mmf) orientation of these coils in DSSRM is such that a short flux path is created. To compare torque per mass of a DSSRM with that of a conventional SRM, finite...
This paper deals with a new type of actuator which can be used for the driving of an Isoglide T3R1 Parallel Robot. The proposed machine is a linear transverse flux motor operating based on the variable reluctance principle. The topology of the motor is presented. A 3D finite element method analysis is carried out on a small dimension structure, evidencing the flux density distribution and the developed...
Radial magnetic force acts on the motor stator cause large vibration and acoustic noise, that have limit the application of switched reluctance motors (SRMs). They can be aggravated when there is unbalanced force due to rotor eccentricity. This paper analyzed the function of bearingless technique in compensating the unbalanced magnetic attraction force; Then the stator radial force mathematic model...
Bearingless drives and magnetic bearings allow the construction of contactless, wearless and lubrication-free rotating systems. Utilizing a permanent magnet excited rotor disc permits the passive stabilization of three degrees of freedom (tilting and axial deflection) by reluctance forces. Hence, using these bearingless slice motors it becomes possible to design very compact magnetically suspended...
A novel stator geometry for linear switched reluctance motor (LSRM) that improves the force profile is presented. In the new geometry, pole shoes are affixed to the stator poles. Static and dynamic characteristics for the proposed structure have been highlighted. Frequency spectrum analyses of force profile using the fast Fourier transform (FFT) are described to predict the vibration frequencies....
In this paper, a new optimization method was used to improve the performance of the long linear motor in Germany TR08 maglev trains. The method analyzed the influence of the dimensions on the performances systematically by time stepping finite element method (FEM). And a series of the quasi-optimized design criteria were also obtained, which were proved to improve some characters of the motor under...
Vibration is a major problem of switched reluctance motor drive system, which can cause undesirable acoustic noise. Acoustic noise is severe when the periodic excitation of the machine normal force excites a natural vibration mode of the stack. So, it is very important for making the periodic excitation frequency to avoid the natural vibration frequency of the stator. In this paper, the electromagnetic...
Bearingless motors combine contactless levitation and rotation in a preferably compact system design, because the bearings as well as the motor windings are located on the same lamination stack. Using a permanent magnet excited disc shaped rotor, three of the six degrees of freedom can be passively stabilized by means of reluctance forces. The bearingless segment motor features concentrated windings...
Predicting the vibration of the switched reluctance motor (SRM) is the key to design low vibration motor. In this paper, a comprehensive study of SRM vibration prediction from low frequency to high frequency is presented. For the low frequency vibration, the prediction model based on transfer function is proposed. The transfer function is calculated using modal analysis and mechanical harmonic analysis...
Though switched reluctance motor (SRM) has some excellent advantages, the acoustic noise, induced by the stator vibration, is one of the major drawbacks for the SRM. So how to reduce the vibration and acoustic noise in the SRM is the key problem at present .Several studies have showed that the main vibration and acoustic noise is saliently related to the configuration, geometry and stator pole shapes...
The stator radial vibration caused by the radial force is the main origin of vibration and acoustic noise in switched reluctance motors. Obtaining non-linear relations of the radial force with the phase current and the rotor position and the radial force waveforms are very important for the nonlinear vibration study. In this paper, non-linear static radial forces at different rotor positions and different...
Optimum design of switched reluctance motor (SRM) and it control circuits require a knowledge of its parameters, Such as inductance, flux linkage and Torque. In this paper, a model of SRM has been developed and analysed with ANSYS Workbench. The variation of Inductance, flux density and directional force with respect to rotor position for two different stator pole shapes has been analysed. It is observed...
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