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The electric vehicles need high efficient torque control system. Therefore, this paper proposes the novel excitation interval control method. The excitation intervals are concentrated around the rotor position where the derivative of inductance becomes maximum values. The efficiency of proposed method is superior to the efficiency of conventional methods.
This paper describes driving characteristics of the electric vehicle (EV) operated by the position sensorless controlled switched reluctance motor (SRM). Assuming the phase inductance waveform to be a sinusoidal one, the space vector of the phase inductance in the SRM can be defined, and the rotor position can be obtained from the phase angle of this space vector. Starting, low speed driving, and...
This paper presents a novel method to estimate the rotor position of a new field assisted switched reluctance motor at standstill and also low speeds. In this method, a high frequency sine wave signal is applied to the field assisted winding on the stator and then the phase of induced signals on each phase winding is monitored to detect the rotor position at standstill. It then continues to sense...
This paper presents the modeling, simulation, and control of Switched Reluctance Motor (SRM) for high-speed applications. The model of SRM is built with help of three-dimensional relationship between excitation currents, rotor position and flux linkage. The relationship makes electromagnetic torque depends not only on the excitation currents but also on the rotor position. Therefore, it is difficult...
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...
The purpose of the paper is to point out an approach that ensures a mathematical description of different switched reluctance motors (SRM) with central geometrical symmetry of active poles, such as SRM6-4, SRM8-6, SRM12-8 etc. The SRM becomes popular nowadays because of the rapid development of control electronics and simulation facilities. In order to build up a proper SRM drive, it is necessary...
This paper presents a comprehensive sensorless method for controlling a 3 phase, 6/4 SRM with complete isolation. In this method the rotor position is achieved by processing the current results of injected high frequency diagnostic pulses to the motor windings. By finding the suitable pulse width at the beginning of the control algorithm and comparing the results, there is no need to consider any...
Because of the doubly salient structure of the switched reluctance motor (SRM) and its intentional operation in deep magnetic saturation for higher power density, its static electromagnetic characteristics are highly nonlinear functions of rotor position and phase current. This makes the accurate experimental measurement/determination of these characteristics a difficult task. This paper presents...
Switched reluctance motors are often running in status of two phases excited simultaneously. Mutual coupling has effects on not only the flux distribution and magnetic saturation, but also the ability of torque output. The two adjacent phases of switched reluctance motor can be excited in two modes, the long-flux-path mode and short-flux-path mode. The calculation method of mutual inductance in two-phase...
This paper presents a new and novel method which is designed to detect the rotor position at standstill and also at low speeds in switched reluctance motor. In this method a small capacitor is connected in series with the motor winding for sampling the voltage rise during the detection period. The supply voltage in conjunction with the drive transistor produces short pulses for this series connection...
This paper presents a new method for determination of the rotor position of the switched reluctance machine (SRM). With this it is possible to eliminate the use of the positions encoder, which is usually necessary to control the SRM. The method is based on a machine model, which includes the phase voltage equation. It can be calculated in real time. Additionally for better dynamic performance a new...
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