Chopper Fed DC Motor Research Articles

Dual fuzzy logic PID controller based regulating of dc motor speed control with optimization using Harmony Search algorithm

This paper discusses the implementation of a Proportional-Integral-Derivative (PID) controller for regulating the speed of a closed loop four quadrant chopper fed DC motor. The PID controller is combined with a Dual Fuzzy Logic Controller to form a DFPID controller for enhancing the performance of speed control of the DC motor. The DFLC is optimized using a metaheuristic algorithm known as Harmony Search Algorithm (HSA). The major aim of this research is to gain an effective control over the speed of the motor in the closed loop environment. For achieving this, the parameters for the DFPID are selected through time domain analysis which aims to satisfy the requisites such as settling time and peak overshoot. Initially, the fuzzy logic controller in the DFPID controls the coefficients of the PID achievement gain an effective control over the system error and rate of error change. Further, the DFPID is improved by the HAS for obtaining a precise correction. The solutions obtained by tuning the DFPID controller are evaluated from simulation analysis conducted on a MATLAB/SIMULINK platform. The closed loop performance is analyzed in both time and frequency domain analysis and the performance of DFPID is optimized using the HSA algorithm to obtain precise value of the control process. As observed from the Simulation analysis, the DFPID-HSA generates optimized control signals to the DC motor for controlling the speed. The performance of the intended speed control approach is analyzed in terms of different evaluation metrics such as motor speed, torque and armature current. Experimental outcomes show that the proposed approach achieves better control performance and faster speed of DC motor compared to conventional PID controllers and SMC controllers

Speed control of DC motor using conventional and adaptive PID controllers

<p>Proportional Integral Derivative (PID) controllers are <a href="http://www.thesaurus.com/browse/extensively">extensively</a> used in practical industries to control the speed of DC Motors. The single weakness of PID controllers is their sensitivity to variation in parameters and operating conditions; thus, tuning the controller gains to adapt with these variations presents a practical challenge. In this paper, an adaptive mechanism that utilizes a Recursive Least Square (RLS) algorithm, with rate limiters, is implemented to perform an online self-adjusting of each of the PID gains in order to achieve Adaptive PID (APID) controller that will accommodate to system variations. MATLAB/ Simulink software is used to implement and simulate APID control of a Chopper-Fed DC motor. A conventional PID control system is also designed and simulated to obtain results that can be used to judge the performance of the APID controller. Results proved that the APID controller forced the motor speed to track the reference input with <a href="http://www.thesaurus.com/browse/insignificant">insignificant</a> tracking error, and also managed to attain the motor speed at its desired value, regardless of the load changes inflected on the motor. This enhances both transient and steady-state speed responses.</p>

Leader following speed synchronisation in multiple DC motor system using a hybrid controller

In this paper, we explore an innovative approach to design a Chopper fed DC motor coupled as a multi-agent system (MAS), predominantly leader following MAS, to achieve consensus on speed regulated by a Hybrid controller. The hybrid controller incorporates pole placement, tracking and regulation (RST) controller accompanied by adaptive model reference adaptive control (MRAC), after that incorporating MIT rule in the design analysis to endorse system stability. Leader following algorithm is fused with the system model to make the speed of following agent's equivalent to that of leader. In the proposed method, every motor with its chopper circuit is treated as sole agent i.e., ith agent. In this paper, we assume that communication among leader and follower is fixed moreover, we also consider two possible scenarios of communication i.e., in the presence of delay and without delay. For model simulation, MATLAB is used and the obtained results endorse effectiveness of the proposed design.

Network Based Speed Synchronization Control in the Brush DC Motors Via LQR and Multi-agent Consensus Scheme

In the presented paper, an innovative method to address the problem of synchronous speed in the network connected DC motors is presented by utilizing the linear quadratic regulator control along with the consensus algorithm of the leader following multi-agent system (MAS). From MAS perspective, each chopper fed DC motor is considered as single agent connected through fixed and undirected network. In this study, common lyapunov function is used to ensure switch system stability in such a way that if the $$\mathscr{i}$$ th agent is controllable and observable, then all the agents in the multi-motor system network can reach the consensus i.e. synchronous speed. To validate the proposed method, simulation results are presented using MATLAB by considering the application of the load on the motors and without load too.

Fractional-order PID control of a chopper-fed DC motor drive using a novel firefly algorithm with dynamic control mechanism

In this paper, a dynamic control mechanism is proposed to improve the firefly algorithm’s (FA) rate of convergence and minimization of the fitness function. The dynamic FA (DFA) dynamically selects the best-performing combinations of the step size scaling factor, the attractiveness coefficient, the absorption coefficient and the population size along the complete evolution process of the algorithm. A fractional-order PID (FOPID) controller based on DFA is proposed to improve the performance of a chopper-fed direct current motor drive. The proposed controller is used in speed control loop to improve the response. To illustrate the efficacy of the DFA-based FOPID, we compare its performance with those based on the conventional FA, genetic algorithm, particle swarm optimization, artificial bee colony algorithm and differential evolution algorithm. The simulation results and analyses show the effectiveness of the proposed method.

Performance Investigation of PI Controller Based Chopper Fed DC Drive

The idea orients to develop a PI controller for closed loop speed control of chopper fed dc drive. PI controller is one of the most preferred controller for speed control of dc drive, which can be easily understood and implemented in practice. The speed of the chopper fed separately excited dc motor can be regulated from below and upto rated speed by using a chopper as a converter. The signal corresponding to the speed error of the motor and change in speed error are given as inputs to the PI controller. The controller output provides the required gating signal that is used to vary the duty cycle of chopper. The chopper firing circuit receives signal from controller, gives variable voltage to the armature of the motor for achieving desired speed response. Modeling of chopper fed dc motor is done. Two loop control system is designed, one for current and another for speed. The complete model of proposed system is simulated using MATLAB (SIMULINK). Also the performance of the simulated model is investigated by using various controller tuning methods.

Design adaptive neuro-fuzzy speed controller for an electro-mechanical system

In this paper an adaptive neuro-fuzzy inference system (ANFIS) controller using error and derivative of error inputs is proposed for the speed control of a separately excited DC motor (SEDM) using chopper circuit. This paper investigates the design and simulation of an adaptive neuro-fuzzy inference system (ANFIS) controller for the speed of DC motor. The performance of the proposed system has been compared with conventional one, where the conventional PI controller (speed controller) in the chopper-fed DC motor drive is replaced by the adaptive neuro-fuzzy controller to improve the dynamic behavior of the model. Computer Simulation is conducted to demonstrate the performance of the proposed controller and results show that the proposed design succeeded over the conventional PI controller where it make reduction of number of ripples and rise time. The entire system has been modeled using MATLAB 2009 toolbox.

Design Fuzzy Self Tuning of PID Controller for Chopper-Fed DC Motor Drive

Tuning the parameters of a PID controller is very important in PID control. Ziegler and Nichols proposed the well-known Ziegler-Nichols method to tune the coefficients of a PID controller. This tuning method is very simple, but cannot guarantee to be always effective. For this reason, this paper investigates the design of self tuning for a PID controller. The controller includes two parts: conventional PID controller and fuzzy logic control (FLC) part, which has self tuning capabilities in set point tracking performance. The proportional, integral and derivate (KP, KI, KD) gains in a system can be self-tuned on-line with the output of the system under control. The conventional PI controller (speed controller) in the Chopper-Fed DC Motor Drive is replaced by the self tuning PID controller, to make them more general and to achieve minimum steady-state error, also to improve the other dynamic behavior (overshoot). Computer Simulation is conducted to demonstrate its performance and results show that the proposed design is success over the conventional PID controller. Keywords: PID controller, Fuzzy logic control, Self tuning controller, Chopper fed-DC motor drive.

Sliding Mode Control of a Mechanical Speed Sensorless dc Motor Drive Fed from a Current Controlled Chopper

This article deals with performance analysis and implementation of a four-quadrant chopper fed dc motor drive system. Control structure of the system is effected through a digital processor. The closed-loop control scheme of the drive utilizes the sliding mode controller (SMC) in its outer speed loop, while the inner loop is equipped with the Pulse Width Modulated (PWM) hysteresis current controller. An algorithmis evolved to eliminate the mechanical speed sensor. To simulate performance of the drive system, a mathematical model is developed. An experimental verification is carried out for the simulated performance.

A Spreadsheet Approach to the Sliding Mode Control of a Chopper Fed DC Motor

An application of microcomputer spreadsheet to the design and performance evaluation of a sliding mode controller for a chopper fed separately excited DC motor is presented. The design is based on a geometric approach for finding out the hyperplane for discontinuous control. The controller has been implemented on a personal computer based drive. The experimental results demonstrate the effectiveness of the controller in improving the system response. A fairly close agreement is observed between the simulated and practical results.

Analogue-to-digital armature current transducer for chopper-fed DC motor drives

A transducer scheme is suggested, permitting A/D conversion of the armature current for microcomputer-controlled variable-frequency-chopper-fed DC motor drives. The transducer supplies the information about the average between two thyristor triggerings value of the armature current, independent of the frequency of the current.

Switched reluctance motor drives for rail traction: relative assessment

The paper reports an assessment of the technical and economic benefits of switched reluctance motor systems applied to railway propulsion in motor sizes of 100?200 kW. Several forms of power electronic circuit have been considered for providing the pulsed DC supply required. Comparison is made with inverter-fed induction motor drives using conventional McMurray three-phase PWM thyristor inverters. Further comparisons are drawn against chopper-fed DC motor systems such as are currently entering service on various railways. It is concluded that the motor itself should offer lower maintenance requirements, higher reliability and a greater power/weight ratio than either the induction motor or the DC motor. The total system, however, appears to show no clear benefits over the induction motor system, and both types are at present more expensive than DC motor systems. (A second view on switched reluctance motor drives by Ray et al. is also published in the same issue.)

Steady-State Investigations of a Chopper-Fed Dc Motor with Separate Excitation

A fixed frequency pulsewidth modulated chopper scheme is utilized to obtain a variable dc voltage from a constant dc voltage source. The steady-state performance of a separately excited chopper-fed dc motor is analyzed by four different methods based upon the following assumptions: 1) negligible commutation interval; 2) negligible ripple in the armature current; 3) constant current during commutation; and 4) direct solution of the governing differential equations. The effect of increased armature circuit resistance due to pulsating armature voltage on the characteristics obtained is discussed. The results by method 4) are found to show good agreement with experimental values.