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Electric propulsion system (EPS) employing Induction Motors (IM) have gained acceptance due to their robust structure, reliability, technological advancement and low cost. This paper presents the technical considerations and design methodology of EPS for urban cars. Direct torque control (DTC) is a prominent technique in controlling the IM due to its easy configuration and fast performance. Nevertheless,...
This paper considers vehicle speed dependent assistant control problems for electric power steering systems (EPSs). According to the requirement analysis of the vehicle speed dependent assistant control, a mathematical model of EPSs is established, and a double closed-loop control system structure is proposed. Based on the assist characteristic of the desired steering wheel torque, the function model...
Predictive torque control (PTC) gains a lot of interest lately. Although the flux-weighting factor is the only tuning parameter in PTC, its selection is not a trivial task. This paper proposes an improved multi-objective fuzzy decision based method to select the best compromise voltage vector. The salient feature of the proposed approach lies in its capability to avoid high torque ripple and the need...
In this paper, a novel hybrid DTC scheme is proposed for asymmetric six-phase PMSM drives, which can achieve faster dynamic response of classical ST-DTC scheme and good steady-state performance of classical SVM-DTC scheme. The key is that a completely novel control strategy for torque and stator flux is designed. Different torque control methods are adopted under dynamic mode and steady-state mode...
Induction motors, which have been widely used in various practical applications, such as fans, pumps, machine tools, vehicle traction motors, etc., are truly the industrial workhorses over the past 120 years. To improve the sensorless induction motor control performance and develop more fault-tolerant motor drives, the paper presents a novel sensorless direct torque control approach based on the proposed...
Permanent Magnet Synchronous Machine (PMSM) torque control over a wide speed range is essentially an optimization problem that treats torque error minimization as the objective function with inverter voltage and current as constraints. It is usually time consuming and difficult to solve such optimization problem for closed-form solutions since torque, voltage and current equations are all non-linear...
In this paper, novel mechanical mechanism and control method using SEA are suggested for natural gait pattern and effective gait rehabilitation. Conventional body weight support system (BWS) focuses on static position lifting and has limitation for a subject to constrain natural gait pattern especially in the vertical and medial-lateral movement. To overcome such abnormal gait pattern during BWS rehabilitation,...
This paper proposes a direct torque control strategy for a brushless dc (BLDC) motor with a single sided matrix converter (SSMC) for an electrohydrostatic actuator system in aerospace application. A hybrid two- and three-phase switching mode is applied to minimize torque ripples during commutation. A six-phase SSMC is investigated and the simulation results are presented. Compared with current hysteresis...
In this paper, we present our research efforts which investigates efficiency of mechanical energy transfer from flywheel to the overall mobile hovering robot body not only with simulations but also with real world experiments. To generate varying amounts of inertia with respect to rotation requirements, a counter rotating flywheel system is developed and multiple angular motion profiles are applied...
This study aims to design an adaptive output recurrent cerebellar model articulation controller (AORCMAC), which is embedded into the direct torque control (DTC) system of an induction motor as the speed controller. Similar to the conventional cerebellar model articulation controller (CMAC), the designed AORCMAC also has the advantages of rapid learning, simple architecture, online training, and nonlinear...
Conventional single-vector-based direct torque control (SVB-DTC) has been widely researched owing to its simple control structure, parameter robustness and fast response. However, the SVB-DTC often features large torque and flux ripple. To suppress the large ripple in torque and stator flux, recently, a duty-cycle-based DTC (DCB-DTC) scheme applying a zero vector and a nonzero vector to the drive...
The common-mode voltage (CMV) could cause severe hazards to the induction machine winding insulation and bearings, reducing the machine lifetime. This paper proposes an improved predictive torque control (PTC) method with CMV reduction strategy which cost little and much smaller than traditional filter method. A simulation based on SIMULINK is analyzed which verify the effectiveness of the proposed...
The direct torque control (DTC) suffers from high torque and flux ripples due to the use of hysteresis comparators. In this paper, an alternative method is presented for induction motor drive known by the model Predictive Torque Control (PTC). This technique includes the inverter model in control design and does not use any modulation block. The optimal selection of inverter switching states minimizes...
This paper validates the advantage of using an integrated electric vehicle-battery model in torque control application. In the integrated electric vehicle-battery model, battery dynamics is explicitly included in the model. A well-known linear quadratic integral (LQI) design is adopted here to have an optimal controller with zero tracking error. The energy consumption is, however, observed through...
In this paper, methods for sizing of PV pumping systems and the simulation of (DTC) Direct Torque Control of induction motor that is used for piloting a water pump supplied by a photovoltaic generator are presented. The sizing of the PV pumping system is based on the calculation of the water needs, the required hydraulic energy and the estimation of available solar power. The best sizing of the PV...
The marine industry is seeing an increasing number of vessels equipped with electric propulsion opposed to traditional mechanical propulsion. Electric propulsion has been shown to be advantageous in various land applications such as locomotives and road vehicles however in the marine setting the highly variable hydrodynamic load exposes the electric propulsion system to extreme load conditions. This...
In this paper a flux weakening method for a wind power permanent magnet generator is proposed. In a wind energy conversion system, the rotor speed increases with the wind speed, hence a flux weakening (FW) algorithm should be implemented as a part of the control structure in order to prevent generator voltage from exceeding the maximum permissive value. On the other hand, it is essential to provide...
In this paper, a novel Multivariable Sliding-mode Extremum Seeking (MSES) Proportional-Integral (PI) tuning method is proposed and its application is studied for torque control in a Permanent Magnet Synchronous Motor (PMSM). To this end, the stator three-phase currents are characterized by their maximum amplitude which directly controls the shaft torque. Hence, a PI controller is applied for controlling...
This work developed two direct torque control strategies to the switched reluctance machine. The direct torque control based on space vector control and direct instantaneous torque control. The studio is performed using the asymmetric bridge converter that drives the three-phase motor of six poles in the stator and four poles on the rotor. At the beginning shows the principles of operation of the...
In view of the saturation of the traditional PI controller, a novel anti-windup controller with integral state prediction function is proposed in the direct torque control system of Brushless DC motor. Based on the analysis of the influence of the traditional speed controller model and the initial value of the integral link on the system, an integral state predictor is set up on the basis of the conventional...
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