-
[show abstract]
[hide abstract]
ABSTRACT: An accurate estimation of flux linkage characteristics is very important during the preliminary design stage and high-performance control of linear switched reluctance motor (LSRM). In this paper, longitudinal and transversal end-effects of a double-side LSRM are studied using analytical method and finite element analysis (FEA). The estimation discrepancy introduced by both end-effects is presented respectively by investigating their sensitivities to machine parameters, such as excitation level, translator position, and stack length.
IEEE Transactions on Magnetics 11/2011; · 1.36 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: Switched reluctance motors (SRMs) have attracted many researchers' and engineers' attention, due to their advantages. However, its electromagnetic behaviors are very complicated and hard to be modeled. Therefore, modeling of flux linkage plays an important role for this type of machine. In this paper, some existed modeling methods of flux linkage for SRMs are surveyed. These modeling methods are fallen into seven classes according to their different features. Also, the advantages and limitations of these methods are discussed. Some considerations for selecting a proper modeling method are introduced form simulations and controller design, etc. Finally, the modeling methods are compared and evaluated based on the considerations.
Power Electronics Systems and Applications (PESA), 2011 4th International Conference on; 07/2011
-
[show abstract]
[hide abstract]
ABSTRACT: Active suspension system is a hot issue in the recent research of automotive industry, which is to generate active force to suppress the variation of the vehicle and improve safety and comfort for the passengers. By observing the dynamics of the vehicle, the controller output forces through linear actuators. Integral sliding mode control is applied here to calculate the output forces and then reject the disturbance. In this paper, an accurate nonlinear active suspension system model is developed first; decoupling of the sprung mass subsystem is investigated hereafter to isolate the dependence of the variables, then integral sliding mode control is used to reject the disturbance and reach the referenced surface for each subsystem. PID control, as a conventional control method, is compared here with the integral sliding mode control. The simulation results show the effectiveness of the proposed control method.
Power Electronics Systems and Applications (PESA), 2011 4th International Conference on; 07/2011
-
[show abstract]
[hide abstract]
ABSTRACT: A novel two-dimensional (2D) direct-drive generator based on switched reluctance principle is proposed in this paper. Due to its unique structure, the device is considered as a 2D power generator for sustainable energy utilization such as wind and wave energy with multidimensional motion forms. The generator has the advantages of simple structure and elimination of mechanical gears and rotary-to-linear motion converters. In this paper, a three dimensional (3D) mechanical model of this generator is designed and finite element analysis (FEA) is applied to simulate the model. From the simulation results, the coupling effect between each direction of power generation is negligible and each phase can be controlled independently. It is expected that the planar switched reluctance generator (PSRG) finds its potential applications in energy utilization area.
Power Electronics Systems and Applications (PESA), 2011 4th International Conference on; 07/2011
-
[show abstract]
[hide abstract]
ABSTRACT: In this paper, a new and cost effective converter, consisting of “half-bridge” IGBT modules and SCRs, for switched reluctance motor drives is proposed. The new method allows the sharing of the IGBT bridge to the switched reluctance motors winding, thus it significantly reduce by half of the component cost. The proposed converter topology is a variation of the conventional asymmetric bridge converter for switched reluctance motor drives. However, utilization of switch modules is enhanced considerably. The requirements of switched reluctance motor drives on converters and the operation of the proposed converter are analyzed and discussed. Furthermore, the simulation and experimental results confirm the feasibility of the proposed converter.
Power Electronics Systems and Applications (PESA), 2011 4th International Conference on; 07/2011
-
[show abstract]
[hide abstract]
ABSTRACT: This paper investigates the direct-drive linear switched reluctance generator for wave energy conversion. A double-sided linear switched reluctance generator is designed. Its nonlinear flux characteristics are simulated by finite element method. The excitation circuit of the linear switched reluctance generator is reviewed and the control algorithm for this generator is also discussed.
Power Electronics Systems and Applications (PESA), 2011 4th International Conference on; 07/2011
-
[show abstract]
[hide abstract]
ABSTRACT: High-precision position control of linear-switched reluctance motor (LSRM) is important in motion-control industry. The static model-based controller sometimes cannot give satisfactory output performance due to the inherent nonlinearities of LSRM and the uncertainties of the system. In this paper, a self-tuning regulator (STR) based on the pole-placement algorithm is proposed for high-precision position tracking of the LSRM. Following the time-scale characteristics analysis of LSRM position-tracking system and force-characteristic investigation, the position-tracking model is treated as a second-order system. Different from the static model-based control schemes, the dynamic model of the LSRM can be obtained by online estimation. Also, some practical aspects are taken into account. Owing to the unmodeled dynamics and high-frequency measurement noises, there are some oscillations in the practical control signals, and they can be reduced by a properly designed filter. Both the simulation and experimental results demonstrate that, in the control of the proposed STR, the position-tracking system can reproduce the reference signal with the desired performance in harsh ambient. These results confirm that the method is effective and robust in the high-precision position tracking of LSRM.
IEEE Transactions on Power Electronics 12/2010; · 4.65 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: A novel linear magnetic levitated actuator using the switched reluctance principle is addressed in this paper. This actuator can be applied to precise motion control of automation machines. The proposed system has the advantages of a simple and robust structure, and direct drive capability. The contactless structure eliminates mechanical wear, friction, noise, and heat generation. To verify the feasibility of the proposed system, the magnetic levitated force is analyzed by magnetic circuit analysis (MCA) and by finite-element analysis (FEA). A prototype structure is fabricated, and experiments are performed with the actual hardware. Results of the MCA and the FEA are both compared with the results obtained from the hardware experiments. They all agree with the proposed design methodology. This paper can form a useful reference in the design of a mechanical structure for magnetic levitated switched reluctance actuators.
IEEE Transactions on Vehicular Technology 12/2010; · 1.92 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: A novel direct-drive rotary-linear switched reluctance motor (RLSRM) is proposed. The motor has the advantages of robust mechanical structure, low manufacture cost and capability of operation under hostile environments. Simulation tools such as finite element analysis (FEA) are applied for the verification of motor performance and corresponding experiments are carried out to testify the simulation results. The authors expect that the innovative actuator design can be applied in industrial applications that require both rotary and linear motions.
Electrical Machines (ICEM), 2010 XIX International Conference on; 10/2010
-
[show abstract]
[hide abstract]
ABSTRACT: The on-line least-square identification method is applied for the linear switched reluctance motor (LSRM) based closed-loop control system. Since switched reluctance motors have severe nonlinear characteristics, on-line system identification for model parameters is the basis for precise modeling and effective control algorithms. By on-line parameter identification of LSRM with least-square scheme, the parameter characteristics can be predicted despite of operation variations. The experimental results demonstrate the identification scheme has fast response and converging speed and the capability of effective parameter prediction under different conditions.
Electrical Machines (ICEM), 2010 XIX International Conference on; 10/2010
-
[show abstract]
[hide abstract]
ABSTRACT: The method of the optimization design with multi-objectives for switched reluctance motors (SRMs) in electric vehicles (EVs) is proposed in this paper. It is desired that electric motors for EVs have high torque, high efficiency, and high torque density. Thus, the developed optimization function is selected as the correct compromise between the maximum average torque, maximum average torque per copper loss, and maximum average torque per motor lamination volume, by using three weight factors and three base values. The stator and rotor pole arc angles are selected as the optimized variables. Furthermore, the authors also discuss the design requirements and some constraints on the optimization design. The results of the optimization design show that the proposed method meets the requirements of EVs on electric motors well. A prototype of the optimally designed in-wheel SRM for EVs has been manufactured. This paper provides a valuable method to implement the optimal design of SRMs for EVs.
IEEE Transactions on Industrial Electronics 10/2010; · 5.16 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: An integral sliding-mode direct torque control (ISM-DTC) scheme with space-vector modulation for wind-energy conversion systems based on doubly-fed induction generators (DFIGs) under unbalanced grid voltage is proposed. The torque and power pulsations at twice the grid frequency caused by unbalanced grid voltage can be minimized by the proposed ISM-DTC scheme. Compared with existing control schemes of DFIGs under unbalanced grid voltage, the parametric uncertainties are included into the design procedure of sliding-mode controller, which guarantees the robustness of the controller. Because the torque and reactive power are directly controlled by the rotor voltage, the measurement, coordinate transformation, and symmetrical component extraction of rotor current are eliminated, which simplifies the structure of the controller. Simulation and hardware implementation results validate the effect and parametric robustness of the proposed ISM-DTC scheme.
IEEE Transactions on Energy Conversion 07/2010; · 2.27 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: This paper presents three criteria for evaluating the motoring operations of switched reluctance motor (SRM) drives for electric vehicles (EVs). They imply motoring torque, copper loss, and torque ripple, respectively. The effects of the turn-off and turn-on angles on these criteria are investigated under hysteresis current control. To fulfill the best motoring operation, consequently, the multiobjective optimization function is developed by using three weight factors and three groups of base values: the correct balance between the maximum average torque, the maximum average torque per root mean square current, and the maximum torque smoothness factor. The study in this paper shows that the turn-off and the turn-on angles can be optimized to maximize the developed multiobjective function. In addition, the control method for the best motoring operation of SRM drives in EVs is proposed. In this method, two angular controllers are proposed to automatically tune the turn-off and turn-on angles to obtain high motoring torque, low copper loss, and low torque ripple. Simulations and experimental results have demonstrated the proposed optimal control method. Therefore, this paper offers a valuable and feasible approach for implementing the best motoring operation of SRM drives for EVs.
IEEE Transactions on Vehicular Technology 04/2010; · 1.92 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: This paper presents three criteria for evaluating the motoring operations of switched reluctance motor (SRM) drives for electric vehicles (EVs). They imply motoring torque, copper loss, and torque ripple, respectively. The effects of the turn-off and turn-on angles on these criteria are investigated under hys-teresis current control. To fulfill the best motoring operation, con-sequently, the multiobjective optimization function is developed by using three weight factors and three groups of base values: the correct balance between the maximum average torque, the maximum average torque per root mean square current, and the maximum torque smoothness factor. The study in this paper shows that the turn-off and the turn-on angles can be optimized to maximize the developed multiobjective function. In addition, the control method for the best motoring operation of SRM drives in EVs is proposed. In this method, two angular controllers are proposed to automatically tune the turn-off and turn-on angles to obtain high motoring torque, low copper loss, and low torque ripple. Simulations and experimental results have demonstrated the proposed optimal control method. Therefore, this paper offers a valuable and feasible approach for implementing the best motor-ing operation of SRM drives for EVs. Index Terms—Control, electric vehicles (EVs), optimization, switched reluctance motor (SRM) drives.
IEEE Transactions on Vehicular Technology 01/2010; 59. · 1.92 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: This paper proposes a novel direct voltage control scheme, using integral variable structure control to synchronize a doubly fed induction generator (DFIG)-based wind energy conversion system (WECS) to the grid. The proposed scheme directly controls the stator terminal voltage of the DFIG to track the grid voltage without current control loop; hence, the structure of controller is simplified. The control scheme includes parametric uncertainty and external disturbances into the formed design procedure; hence, the proposed scheme has better robustness than existing synchronization methods. Both computer simulation and hardware implementation results are presented to demonstrate the advantages of the proposed scheme.
IEEE Transactions on Energy Conversion 01/2010; · 2.27 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: The magnetic characteristics of a linear switched reluctance motor (LSRM) are important in its performance prediction and verification. Owing to the complicated magnetic paths, the measurement of the flux linkage for this type motor has drawn many researchers' attentions. In this paper, a new flux linkage measurement method for LSRMs is proposed to obtain the flux linkage characteristics of LSRMs using an online winding resistance estimation technique. Both the theoretical derivation and the actual implementation of the proposed method are addressed in this paper. In comparison with the search coil scheme and the static resistor scheme, experimental results confirm the validity and accuracy of this method. In short, the proposed method is simple, effective, and easy to be implemented. It is a practical solution for flux linkage measurement of LSRMs and other motors.
IEEE Transactions on Instrumentation and Measurement 11/2009; · 1.21 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: In this paper, a continuous position estimation scheme is presented for linear switched reluctance motors (LSRMs). The scheme uses diagnostic current injection into an unenergized phase to detect the motor position. This paper proposed that a new current integration index be used to quantify the measurement of current waveform. Hardware implementation results demonstrate the effectiveness of the proposed estimation scheme for the LSRM. This paper also performs a study on the accuracy of the estimated position. Through the detailed experimental data, the approach of polynomial fitting is compared with the lookup table with regard to characteristic curve representation. The estimation error distributions and their standard deviation show that the accuracy and precision are close between these two approaches.
IEEE Transactions on Instrumentation and Measurement 09/2009; · 1.21 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: Based on the requirements of electric vehicles on electric motor drives, this paper presents three criteria to evaluate motoring operation of in-wheel switched reluctance motor drives for electric vehicles. They are the average torque, the average torque per rms current, and torque smoothness factor. They indicate the motoring torque, copper loss and torque ripple, respectively. The model of motoring operation under the current hysteresis control is developed to investigate the effects of the turn-on angle, the turn-off angle, and the current reference on these criteria. The simulated and measured current waveforms verify the proposed model. The simulated results show that the turn-on angle and the turn-off angles have considerable effects on motoring operation of switched reluctance drives. The optimal turn-on angle and the optimal turn-off angle can be optimized in order to maximum the average torque, the average torque per rms current, or the torque smoothness factor. In addition, the larger current reference results in the larger average torque, average torque per rms current and torque smoothness factor. Thus, this study is helpful for developing new control method to implement the best motoring operation of in-wheel switched reluctance motor drives in electric vehicles.
Power Electronics Systems and Applications, 2009. PESA 2009. 3rd International Conference on; 06/2009
-
[show abstract]
[hide abstract]
ABSTRACT: This paper presents an integral sliding mode control method with integral switching gain for the position trajectory of magnetic levitation apparatus. The magnetic levitation system is open loop instable, and it is a nonlinear dynamic system in nature. Many kinds controllers are proposed to face this challenge. Those controllers shall be robust enough to overcome the variations of system parameters and external disturbances, this is especially important in engineering applications. In this paper, a magnetic levitation system is firstly modeled. After that, an integral sliding mode controller with integral switching gain is proposed, the integral sliding mode control can guarantee the robustness to variations of system parameters and external disturbances, the integral switching gain can reduce the chattering obviously. Both the simulation results and the experimental results confirm the effectiveness of the controller.
Power Electronics Systems and Applications, 2009. PESA 2009. 3rd International Conference on; 06/2009
-
[show abstract]
[hide abstract]
ABSTRACT: Magnetic levitation systems are contactless type, there are no mechanical components between the translator and the stator. Hence, it can eliminate the mechanical wear, friction, noise, heat generation, and metal dust, satisfy environmental demand, and enable the system to move at high speed. Although the magnetic levitation systems have vast potential in engineering applications because of the above merits, the open loop instability and nonlinearity characteristics of the systems hamper its implementation. Therefore, the robust control is very important for the magnetic levitation systems. In this paper, the investigation, design, simulation and fabrication of a testing fixture for planar magnetic levitation system control are addressed, based on switched reluctance (SR). The proposed fixture uses three coils made by laminated silicon steel for levitation. This system has a much simpler structure, and it can lower manufacturing cost. In this paper, we firstly discussed the mechanical structure of the proposed planar magnetic levitation system. Secondly, magnetic circuit analysis (MCA) was carried out to calculate the electromagnetic force. Then, the simulation of one single coil control is applied. The simulation results were very satisfactory and it validated the design concept. Finally, the control algorithm of the planar magnetic levitation system, which is a multiple input and multiple output (MIMO) system, was discussed.
Power Electronics Systems and Applications, 2009. PESA 2009. 3rd International Conference on; 06/2009
