Speed Control of Shunt-Wound DC Motors Using Switching Technique

2018 ◽  
Author(s):  
Shahin S. Nudehi ◽  
Ryan Newendyke ◽  
Dylan Antonides ◽  
Timothy Zange
Keyword(s):  
Control System ◽  
Tracking Error ◽  
Speed Control ◽  
Feedback Control System ◽  
Switching Rate ◽  
Dc Motors ◽  
System A ◽  
The Stability ◽  
Fast Acting ◽  
Theoretical Results

In this paper, a switching feedback control system for speed control of a shunt-wound DC motor is described. In the control system a fast-acting switch periodically opens and closes between the motor terminal and the motor driver in order to estimate the motor’s speed. Theoretical results predicted the stability of the control system and it was shown that the tracking error in the motor’s speed is linearly dependent on the switching rate. To prove the applicability of this approach, an experimental setup was built and the switching control system was implemented using the real-time hardware within MATLAB/SIMULINK™ software.

Stability analysis in machining process by using adaptive closed-loop feedback control system in turning process

2020 ◽  
pp. 107754632095261
Author(s):  
Kashfull Orra ◽  
Sounak K Choudhury
Keyword(s):  
Control System ◽  
Feedback Control ◽  
Closed Loop ◽  
Machining Process ◽  
Feedback Control System ◽  
Turning Process ◽  
Tool Vibration ◽  
Loop Feedback ◽  
Closed Loop Feedback ◽  
The Stability

The study presents model-based mechanism of nonlinear cutting tool vibration in turning process and the strategy of improving cutting process stability by suppressing machine tool vibration. The approach used is based on the closed-loop feedback control system with the help of electro–magneto–rheological damper. A machine tool vibration signal generated by an accelerometer is fed back to the coil of a damper after suitable amplification. The damper, attached under the tool holder, generates counter forces to suppress the vibration after being excited by the signal in terms of current. The study also discusses the use of transfer function approach for the development of a mathematical model and adaptively controlling the process dynamics of the turning process. The purpose of developing such mechanism is to stabilize the machining process with respect to the dynamic uncut chip thickness responsible for the type-II regenerative effect. The state-space model used in this study successfully checked the adequacy of the model through controllability and observability matrices. The eigenvalue and eigenvector have confirmed the stability of the system more accurately. The characteristic of the stability lobe chart is discussed for the present model-based mechanism.

A Precision Speed Control System for DC Motors

1971 ◽  
Vol 17 (5) ◽  
pp. 147-151
Author(s):  
Raghu Nath ◽  
N. Krishnan ◽  
B. S. Sonde
Keyword(s):  
Control System ◽  
Speed Control ◽  
Dc Motors ◽  
Speed Control System

Dual DC Motor Speed Control Based on Two Independent Digital PWM Signals using PIC16F877A Microcontroller

2016 ◽  
Vol 2 (3) ◽  
pp. 592
Author(s):  
Ayman Y. Yousef ◽  
M. H. Mostafa
Keyword(s):  
Control System ◽  
Software Package ◽  
Speed Control ◽  
Dc Motor ◽  
Open Loop ◽  
Motor Speed ◽  
Dc Motors ◽  
Duty Cycles ◽  
Speed Control System ◽  
Control System Model

<p>In this paper a dual open loop speed control system based on two independent PWM signals of small permanent magnet DC (PMDC) motors using PIC16F877A microcontroller (MCU) has been designed and implemented. The Capture/Compare/PWM (CCP) modules of the MCU are configured as PWM mode and the MCU is programmed using flowcode software package to generate two PWM signals with various duty cycles at the same frequency. A dual H-bridge channel chip SN754410 is used to drive the motors. The variation of PWM duty cycles is related directly to controlling the DC motors terminal voltage which directly proportional with speed of each motor. The complete PWM control system model has been simulated using proteus design suite software package. The development of hardware and software of the dual DC motor speed control system has been explained and clarified.</p>

Reduction Methods of Structure Models for Control System Purposes

2016 ◽  
Vol 248 ◽  
pp. 119-126 ◽  
Author(s):  
Andrzej Koszewnik ◽  
Zdzisław Gosiewski
Keyword(s):  
Control System ◽  
High Frequency ◽  
Closed Loop ◽  
Flexible Structures ◽  
Low Frequency ◽  
Point Of View ◽  
Closed Loop Systems ◽  
System A ◽  
Reduction Methods ◽  
The Stability

To design vibration control system for flexible structures their mathematical model should be reduced. In the paper we consider the influence of the model reduction on the dynamics of the real closed-loop system. A simply cantilever beam is an object of consideration since we are able to formulate the exact analytical model of such structure. As a result of reduction the model with low frequency resonances is usually separated from the high frequency dynamics because high frequency part of the model is naturally strong damped. In order to estimate dynamical system for control purposes in the paper we applied a few orthogonal methods such as: modal, Rayleigh-Ritz and Schur decompositions. As it is shown all methods well calculate resonances frequencies but generate different anti-resonances frequencies. From control strategy in point of view of the flexible structures these anti-resonances have significantly influence on the stability and dynamics of the closed-loop systems.

Idle Speed Control for GDI Engines with Interval Time-Delay

2012 ◽  
Vol 588-589 ◽  
pp. 1598-1601 ◽  
Author(s):  
Xue Jun Li ◽  
Wei Hong ◽  
Yan Su
Keyword(s):  
Control System ◽  
Direct Injection ◽  
Speed Control ◽  
Gasoline Direct Injection ◽  
Idle Speed ◽  
Idle Speed Control ◽  
Interval Delay ◽  
Gdi Engine ◽  
The Stability ◽  
Gdi Engines

The gasoline direct injection (GDI) engine is a highly non-linear and a delayed system. The engine modle with time-delays is derived. The delays consist of an intake to torque production state delay and a network -induced interval delay. Base on the Liapunov-Krasovskii function, the criterion of interval delay control system is proposed, which ensure the idle speed control system is stability as well as robust. The simulation results show that the H∞ control has good robustness,which improves the stability of the idle speed of the GDI engine.

A New Speed Control System for DC Motors Using GTO Converter and its Application to Elevators

1985 ◽  
Vol IA-21 (2) ◽  
pp. 391-397 ◽  
Author(s):  
Hiromi Inaba ◽  
Seiya Shima ◽  
Akiteru Ueda ◽  
Takeki Ando ◽  
Toshiaki Kurosawa ◽  
...  
Keyword(s):  
Control System ◽  
Speed Control ◽  
Dc Motors ◽  
Speed Control System

Evaluation of Rotational Speed Control System for Water Driven Spindle With Disturbance Observer

2015 ◽  
Author(s):  
Akio Hayashi ◽  
Yohichi Nakao
Keyword(s):  
Control System ◽  
Rotational Speed ◽  
Disturbance Observer ◽  
Speed Control ◽  
Precision Machining ◽  
Feedback Control System ◽  
Speed Control System ◽  
Ultra Precision ◽  
Rotational Speed Control ◽  
The Mathematical Model

In ultra-precision machining to produce various precision products such as lenses or mirrors, the single-point diamond cutting is mainly carried out to achieve the high accuracy and high quality machined surfaces. Thus, the precise rotation accuracy is required to the spindle of the ultra-precision machining tool. The water driven spindle had been developed for the precision machining tool spindle. This spindle is driven by the torque of water flow power. Then, the rotational speed can be controlled by supplied flow rate of water. However, the rotational spindle speed during cutting operation is changed due to the influence of the cutting forces during the machining processes. The change in the rotational speed causes the change in the cutting speed, as a result, it degrades the machined surface quality as well. In order to reveal and reduce the influence of this phenomenon, the mathematical model of the rotational speed control system for water driven spindle was derived. This rotational speed control system consists of the water driven spindle and the flow control valve. From the simulation results using a derived transfer function of the rotational speed control system, it is clarified that the rotational speed changes depending on the external load torque. Then, based on the mathematical model, the feedback rotational speed control system with a conventional P-I controller is designed. The effectiveness of the proposed feedback control system is verified by the turning tests. Furthermore, a disturbance observer to minimize the influence of cutting forces on the rotational speed was added to the feedback control system. As a result, this paper shows the performance of the rotational speed control system.

Automatically Adjusting the Transmission Power of ZigBee End-Devices Based on RSSI

2013 ◽  
Vol 803 ◽  
pp. 423-429 ◽  
Author(s):  
Xiu Zhen Yu ◽  
Zhong Hu Yuan ◽  
Wen Wu Hua ◽  
Oluleke Bamodu
Keyword(s):  
Control System ◽  
Signal Strength ◽  
Network System ◽  
Transmission Power ◽  
Feedback Control System ◽  
Power Performance ◽  
Communication Condition ◽  
Negative Feedback Control ◽  
The Stability ◽  
Received Signal Strength Indication

This paper proposes a method that automatically adjusts the transmission power of ZigBee end-devices based on received signal strength indication (RSSI). Under normal communication condition, automatically adjusting the transmission power of ZigBee end-devices by constructing a negative feedback control system, and it uses the controller with relay characteristics, keep it in the smallest state of transmission power, which effectively reduces the energy consumption of the end-devices. Compared with the traditional methods of statically adjusting transmission power, experimental results show that the method proposed is more suitable for network with frequently status changes, making the stability and low-power performance of ZigBee network system significantly improved.

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