Direct drive motors became very popular due to the simple mechanical structure that avoids the use of a speed reducer that can cause position errors and instability. With the use of a direct drive motor, undesired backlash, and flexibility are reduced significantly. However, since load variation is linked to the motor axis directly, an advanced algorithm has to be applied in the motion control ...

<p><span>Direct-current (DC) motor is a commonly used motor; its speed directly affected by applying mechanical load. This paper proposes the design of wide speed-load range controller for direct-current shunt based on proportional–integral–derivative (PID controller) with genetic system parameters adjusting. The PID simulated using Matlab software package and tested different sudde...

D emand response, a cornerstone of smart-grid technology, lets consumers participate directly in energy markets by limiting their energy use during periods of emergency or peak demand. In a direct-control demand-response approach, an electricity service provider (ESP) offers consumers discounts or other incentives if they agree to let the ESP send load-shed instructions (LSIs) to specified appl...

Direct load control can be achieved by varying the hysteresis band of switchable loads, thereby changing their on/off durations. Such hysteresis-based control methods may, however, display complex dynamics that must be thoroughly understood in order to design safe control mechanisms. This paper explores the dynamical behavior of a group of hysteresis-based PEV chargers. Of interest is the chang...

in direct torque control, the selection of an applied voltage vector is based on the measuredparameters at the beginning of the sampling period. the delay between the measurement and the application of the voltage vector is the origin of an extra torque ripple. in this paper, a new predictive controller is proposed for compensating this delay and reducing the torque ripple. the stator current i...

The purpose of this paper is to describe a model predictive direct torque control (MPDTC) with load angle limitation for surface-mounted permanent magnet synchronous motor (SPMSM) drive system. In this paper, an exact discrete-time state-space model of SPMSM is presented, which improves the state prediction accuracy comparing to simple Euler approximation. A finite control set type MPDTC is use...

This paper considers the problem of the robot motion control in a presence of the major uncertainties such as the varying load. The proposed adaptive fuzzy system (FLS) is employed to estimate dynamic influence of the varying load and also the major part of the mechanism dynamics. Carefully designed membership functions and rules preserve the interpretability of FLS as each rule works toward es...

This paper presents a comparison between a fuzzy logic controller and a conventional IP controller used for speed control with a direct stator flux orientation control of a doubly fed induction motor. The effectiveness of the proposed control strategy is evaluated under different operating conditions such as of reference speed and for load torque step changes at nominal parameters and in the pr...

Information and communication technologies (ICT) play significant role in modern smart grids (SG). SG functionalities require implementation of devices with computing performance into the grids and communication network between these devices. This has also been the case in a low-voltage direct current (LVDC) electricity distribution system, to which remote and automated grid monitoring and cont...