scholarly journals High-Accuracy and Fast-Response Flywheel Torque Control

2014 ◽  
Vol 2014 ◽  
pp. 1-10
Author(s):  
Xinxiu Zhou ◽  
Meng Li ◽  
Ran Zhang
Keyword(s):  
Degrees Of Freedom ◽  
Current Mode ◽  
Response Speed ◽  
Fast Response ◽  
Torque Control ◽  
Recursive Least Squares ◽  
Control Scheme ◽  
Feedforward Controller ◽  
Speed Mode ◽  
Motor Drive System

Compared with current mode flywheel torque controller, speed mode torque controller has superior disturbance rejection capability. However, the speed loop delay reduces system dynamic response speed. To solve this problem, a two-degrees-of-freedom controller (2DOFC) which consists of a feedback controller (FBC) and a command feedforward controller (FFC) is proposed. The transfer function of FFC is found based on the inverse model of motor drive system, whose parameters are identified by recursive least squares (RLS) algorithm in real-time. Upon this, Kalman filter with softening factor is introduced for the improved parameters identification and torque control performances. Finally, the validity and the superiority of the proposed control scheme are verified through experiments with magnetically suspended flywheel (MSFW) motor.

Reinforcement learning-based dynamic position control of mobile node for ocean sensor networks

2021 ◽  
pp. 014233122110430
Author(s):  
Weijun Wang ◽  
Huafeng Wu ◽  
Xianglun Kong ◽  
Yuanyuan Zhang ◽  
Yang Ye ◽  
...  
Keyword(s):  
Reinforcement Learning ◽  
Sensor Networks ◽  
Position Control ◽  
Response Speed ◽  
Fast Response ◽  
Mobile Node ◽  
Position Estimation ◽  
Mobile Nodes ◽  
Control Scheme ◽  
Ocean Sensor Networks

In this paper, a novel dynamic position control (PC) approach for mobile nodes (MNs) is proposed for ocean sensor networks (OSNs) which directly utilizes a neural network to represent a PC strategy. The calculation of position estimation no longer needs to be carried out in the proposed scheme, so the localization error is eliminated. In addition, reinforcement learning is used to train the PC strategy, so that the MN can learn a more highly accurate and fast response control strategy. Moreover, to verify its applicability to the real-world environment, we conducted field experiment deployment in OSNs consisting of a MN designed by us and some fixed nodes. The experimental results demonstrate the effectiveness of our proposed control scheme with impressive improvements on PC accuracy by more than 53% and response speed by more than 15%.

A Novel UVLO Circuit with Current-Mode Control Technique for DC-DC Converters

2013 ◽  
Vol 765-767 ◽  
pp. 2534-2537
Author(s):  
Yun Wu Zhang ◽  
Jing Zhu ◽  
Wei Feng Sun
Keyword(s):  
Threshold Voltage ◽  
Supply Voltage ◽  
Current Mode ◽  
Response Speed ◽  
Fast Response ◽  
Control Technique ◽  
High Threshold ◽  
Current Mode Control ◽  
Mode Control ◽  
Threshold Voltages

A novel Under Voltage Lockout (UVLO) circuit featuring with fast response speed and low temperature coefficient threshold voltages is proposed in this paper. Compared with the conventional structure, the proposed circuit achieves the fast response ability thanks to the current-mode control technique is utilized. Meanwhile, this UVLO realizes hysteretic threshold by a feedback control path to improve the interference rejection capability. In addition, the threshold voltage varies slightly with the variation of the supply voltage and temperature by using a bandgap core. The proposed circuit implemented with 0.5μm BCD technology has an input high threshold voltage of 8.5V and a hysteresis of 1.5V, and start or shut off the power quickly. Test results verified that the proposed UVLO has the qualification to be applied to DC-DC converters.

scholarly journals Improved Position Control for an EGR Valve System with Low Control Frequency

Energies ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 457
Author(s):  
Hyeong-Jin Kim ◽  
Yung-Deug Son ◽  
Jang-Mok Kim
Keyword(s):  
Position Control ◽  
Feedforward Control ◽  
Fast Response ◽  
Control Frequency ◽  
Position Response ◽  
Control Scheme ◽  
Position Controller ◽  
Valve Position ◽  
Feedforward Controller ◽  
Gas Recirculation

An exhaust gas recirculation (EGR) valve position control system requires fast response without overshoot, but the low control frequency limits control bandwidth and results in poor position response. A novel EGR valve position control scheme is proposed to improve the position response at low control frequency. This is based on the feedforward controller, but the feedforward control loop is implemented without the position pattern generator or derivative. The proposed method estimates the acceleration command through the relationship between the position controller output, the speed command and the speed limiter, and compensates the cascaded proportional-proportional integral (P-PI) controller. In this method, many operations are not required and noise due to derivative is not generated. This method can improve the position response without much computation and derivative noise at the low control frequency. Experimental results are presented to verify the feasibility of the proposed position control algorithm.

scholarly journals Torque and Flux Ripple Minimization of Induction Motor Using Hybrid Neuro Fuzzy Controller

2018 ◽  
Vol 7 (4.6) ◽  
pp. 377
Author(s):  
V. Sakthi ◽  
A. Sivasubramanian
Keyword(s):  
Induction Motor ◽  
Fuzzy Controller ◽  
Direct Torque Control ◽  
Fast Response ◽  
Torque Control ◽  
Stator Current ◽  
Neuro Fuzzy ◽  
Motor Drive System ◽  
Flux Minimization ◽  
Speed Response

This paper proposed to design, implementation and simulation of Direct Torque Control of Induction Motor drive system is to minimize stator current distortion, electromagnetic torque and flux ripples. In this paper, Hybrid Neuro-Fuzzy Controller is proposed to replace the conventional PI torque and flux controller to achieve desired torque and flux with zero steady state error and also with good dynamic fast response. Neuro-Fuzzy based torque and flux controllers are designed to optimize the stator voltages in d-q reference frame that applied to Direct Torque Control. Simulation and the performance of the proposed Hybrid NFC are analyzed. Simulation results showed that a significant improvement in dynamic torque and speed response in both steady and transient states and also a considerable reduction in torque and flux minimization compared to the other AI techniques.  

PD control with feedforward compensation for robot manipulators: analysis and experimentation

Robotica ◽  
2001 ◽  
Vol 19 (1) ◽  
pp. 11-19 ◽  
Author(s):  
Victor Santibañez ◽  
Rafael Kelly
Keyword(s):  
Asymptotic Stability ◽  
Global Asymptotic Stability ◽  
Degrees Of Freedom ◽  
Robot Manipulators ◽  
Classical Model ◽  
Experimental Tests ◽  
Torque Control ◽  
Direct Drive ◽  
Pd Control ◽  
Control Scheme

One of the simplest and natural appealing motion control strategies for robot manipulators is the PD control with feedforward compensation. Although successful experimental tests of this control scheme have been published since the beginning of the eighties, the proof of global asymptotic stability has remained unattended until now. The contribution of this paper is to prove that global asymptotic stability can be guaranteed provided that the proportional and derivative gains are adequately selected. The performance of the PD control with feedforward compensation evaluated on a two degrees-of-freedom direct-drive arm appears as fine as the classical model-based computed torque control scheme.

Predictive, Deadbeat, and Combined Controls

2018 ◽  
Author(s):  
Sadegh Vaez-Zadeh
Keyword(s):  
Control Systems ◽  
Predictive Control ◽  
Direct Torque Control ◽  
Fast Response ◽  
Torque Control ◽  
Control Methods ◽  
Electric Motors ◽  
Operating Cycle ◽  
Combined Control ◽  
The One

In this chapter, three control methods recently developed for or applied to electric motors in general and to permanent magnet synchronous (PMS) motors, in particular, are presented. The methods include model predictive control (MPC), deadbeat control (DBC), and combined vector and direct torque control (CC). The fundamental principles of the methods are explained, the machine models appropriate to the methods are derived, and the control systems are explained. The PMS motor performances under the control systems are also investigated. It is elaborated that MPC is capable of controlling the motor under an optimal performance according to a defined objective function. DBC, on the other hand, provides a very fast response in a single operating cycle. Finally, combined control produces motor dynamics faster than one under VC, with a smoother performance than the one under DTC.

scholarly journals Tin Disulfide-Coated Microfiber for Humidity Sensing with Fast Response and High Sensitivity

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 648
Author(s):  
Aijie Liang ◽  
Jingyuan Ming ◽  
Wenguo Zhu ◽  
Heyuan Guan ◽  
Xinyang Han ◽  
...  
Keyword(s):  
Humidity Sensor ◽  
Small Diameter ◽  
High Sensitivity ◽  
Large Change ◽  
Small Variation ◽  
Response Speed ◽  
Fast Response ◽  
Tin Disulfide ◽  
Recovery Times ◽  
Response And Recovery

Breath monitoring is significant in assessing human body conditions, such as cardiac and pulmonary symptoms. Optical fiber-based sensors have attracted much attention since they are immune to electromagnetic radiation, thus are safe for patients. Here, a microfiber (MF) humidity sensor is fabricated by coating tin disulfide (SnS2) nanosheets onto the surface of MF. The small diameter (~8 μm) and the long length (~5 mm) of the MF promise strong interaction between guiding light and SnS2. Thus, a small variation in the relative humidity (RH) will lead to a large change in optical transmitted power. A high RH sensitivity of 0.57 dB/%RH is therefore achieved. The response and recovery times are estimated to be 0.08 and 0.28 s, respectively. The high sensitivity and fast response speed enable our SnS2-MF sensor to monitor human breath in real time.

scholarly journals Nonlinear Current-Mode Control of SCIG Wind Turbines

Energies ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 55
Author(s):  
Nicholas Hawkins ◽  
Bhagyashri Bhagwat ◽  
Michael L. McIntyre
Keyword(s):  
Current Mode ◽  
Nonlinear Controller ◽  
Flux Observer ◽  
Current Mode Control ◽  
Mode Control ◽  
Squirrel Cage ◽  
Control Scheme ◽  
Control Schemes ◽  
Rotor Flux ◽  
Squirrel Cage Induction Generator

In this paper, a nonlinear controller is proposed to manage the rotational speed of a full-variable Squirrel Cage Induction Generator wind turbine. This control scheme improves upon tractional vector controllers by removing the need for a rotor flux observer. Additionally, the proposed controller manages the performance through turbulent wind conditions by accounting for unmeasurable wind torque dynamics. This model-based approach utilizes a current-based control in place of traditional voltage-mode control and is validated using a Lyapunov-based stability analysis. The proposed scheme is compared to a linear vector controller through simulation results. These results demonstrate that the proposed controller is far more robust to wind turbulence than traditional control schemes.

scholarly journals Self-Powered All-Inorganic Perovskite Photodetectors with Fast Response Speed

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Ting Zhang ◽  
Shibin Li
Keyword(s):  
High Performance ◽  
Solution Process ◽  
Response Speed ◽  
Fast Response ◽  
Single Step ◽  
Inorganic Perovskite ◽  
Perovskite Materials ◽  
Photoactive Materials ◽  
Self Powered ◽  
Solvent Processing

AbstractIn this manuscript, the inorganic perovskite CsPbI2Br and CsPbIBr2 are investigated as photoactive materials that offer higher stability than the organometal trihalide perovskite materials. The fabrication methods allow anti-solvent processing the CsPbIxBr3−x films, overcoming the poor film quality that always occur in a single-step solution process. The introduced diethyl ether in spin-coating process is demonstrated to be successful, and the effects of the anti-solvent on film quality are studied. The devices fabricated using the methods achieve high-performance, self-powered and the stabilized photodetectors show fast response speed. The results illustrate a great potential of all-inorganic CsPbIxBr3−x perovskites in visible photodetection and provide an effective way to achieve high performance devices with self-powered capability.

Sign in / Sign up

Export Citation Format

Share Document