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According to the work characteristics of the electromechanical actuator, a control scheme of direct DC electromechanical actuator based on discrete-time variable structure controller is designed. The effect of hinge moment is considered in the mathematical model, and the coefficients of its transfer function are appropriately amended. The effect of the three parameters in the design of discrete-time...
The principle of vector control of AC machine enables the dynamic control of AC motors, and induction motors in particular to a level comparable to that of a DC machine. The vector control of currents and voltages results in control of spatial orientation of the electromagnetic fields in the machine and has led to term field orientation. Field oriented control schemes provide significant improvement...
This paper presents a position-sensorless field-oriented control of a novel axial flux permanent magnet machine for flywheel energy storage system. The approach is based on the estimation of the motor induced voltage with the help of measured stator currents and reference voltages. Based on sliding mode observers, rotor position can be accurately estimated. This novel flywheel energy storage system...
Anti-lock and also Anti-slip braking system controller designed for stability enhancement of vehicle during braking and turning circumstances is presented. Using available signals, a novel structure is proposed for vehicle stability improvement encountering critical braking conditions such as braking on slippery or μ-split road surfaces. In conventional vehicles, undesired lane changes may occur due...
A robust position control for induction motors using field oriented control theory is presented. The proposed controller is based on variable structure control and provides global asymptotic position tracking in the presence of unknown parameters and load torque variations. The proposed design incorporates an improved method of flux estimation that operates on the principle of flux and current observer...
In order to research the problem about the motion control of a spherical robot, using the constrained Lagrangian method the motion models with uncertainty items are developed, and the motion control strategies, including the lateral attitude controller and longitudinal velocity controller, are designed based on the nonlinear sliding-mode control method. Both controllers guarantee convergence of the...
This paper introduces a new simple sensorless algorithm of estimating the permanent magnet synchronous motor (PMSM) speed and position. The proposed estimation method is implemented using a stator flux/current and a modified back electromotive force (EMF) observer connected in cascade. The flux/current observer based on sliding mode techniques ensures stator currents convergence while the modified...
The position tracking control of a missile electrohydraulic servo mechanism is studied. Since the dynamics of the system are highly nonlinear and have large extent of model uncertainties, such as big changes in load and parameters, a design method of adaptive fuzzy sliding mode control is presented. The adaptive fuzzy controller is introduced to approach the equivalent control of sliding mode control,...
The main goal of increasing the number of phases in an induction machine is to ensure its performance in all the operating modes such as normal, disturbed and faulted settings. When the induction machine is working under a faulted mode such as one or more phases are missing, this leads to a high torque oscillations and bad tracking behaviour. Designing a suitable control design such as sliding mode...
Principles of forced dynamics control and sliding mode control are combined to derive control algorithm for position control of the drive with induction motor. The controller is of the cascade structure, comprising an inner speed control loop based on forced dynamics control and an outer position control loop based on sliding mode control. The inner speed control loop respects the principles of vector...
For the purpose of preventing a free-falling object from damage, this study is devoted to the landing posture control via trajectory planning for a generalized twin-body system by employing the methods of PD and sliding control. The system discussed herein is the simplified model of a free-falling cellular phone with two rotational DOFs. In this paper, the governing equations of the system are first...
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