Closed-loop Speed Control Research Articles

Implementation of maximum efficiency control for matrix‐converter‐based interior permanent magnet synchronous motor drive systems

An implementation of an online maximum efficiency control for matrix-converter-based interior permanent magnet synchronous motor drive systems is proposed. A simplified efficiency model of the drive system is established first; as a result, detailed models of the matrix-converter loss and motor loss are not required. Next, an algorithm that calculates the steepest ascent to maximum efficiency is proposed. By identifying the maximum efficiency operating point, the efficiency of the whole drive system can be significantly improved based on the simplified efficiency model. A digital signal processor TMS320LF2407A and a complex programmable logic device EMP570GT100C4 are used as a control centre to execute the phase commutation, closed-loop speed control method, current regulating method, and maximum efficiency control method. Experimental results can validate the theoretical analysis and demonstrate the feasibility and correctness of the proposed method.

A Metaheuristic Optimization Approach for Tuning of Fractional-Order PID Controller for Speed Control of Sensorless BLDC Motor

This paper deals with a novel method for Bat Algorithm (BA) based on optimal tuning of Fractional-Order Proportional Integral Derivative (FOPID) controller for governing the rotor speed of sensorless Brushless Direct Current (BLDC) motor. The BA is used for developing a novel optimization algorithm which can generate five degrees of freedom parameters namely [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] of FOPID controller. The desired speed control and robust performance are achieved by using the FOPID closed loop speed controller with the help of BA for optimal tuning. The time domain specifications of a dynamic system for unit step input to FOPID controller for speed response such as peak time ([Formula: see text]), Percentage of overshoot (PO), settling time ([Formula: see text]), rise time ([Formula: see text]) have been evaluated and the steady-state error ([Formula: see text]) of sensorless speed control of BLDC motor has been measured. The simulation results are compared with Artificial Bee Colony (ABC) optimization method and Modified Genetic Algorithm (MGA) for evaluation of transient and steady state time domain characteristics. The proposed BA-based FOPID controller optimization technique is more efficient in improving the transient characteristic performance and reducing steady state error.

Design and Simulation of Double Closed-loop DC Motor Speed Regulation System with Fuzzy PID Controller

This paper introduced the principle of one dual closed-loop DC motor speed control system with fuzzy PID controller. The algorithm could reduce the setting time and the over-shoot of the step response of the speed-current loop control system, with comparison of the traditional PID after simulation.

Simulation study on speed control of permanent magnet direct-driven system for mining scraper conveyor

A simulation method of speed control based on the load characteristic of the permanent magnet direct-driven system is presented for mining scraper conveyor. Firstly, the mathematical model of permanent magnet synchronous motor (PMSM) is established based on the coordinate transformation theory. Subsequently, the closed loop speed controller of permanent magnet direct-driven systems is designed on the basis of sliding mode control theory and motor model. The chain characteristics of scraper conveyor are described by Kelvin-Vogit model, and the dynamic model of the overall scraper conveyor system is established with distinct element method. Then, according to the coupling relationship between the permanent magnet direct-driven system and the scraper conveyor, the simulation model of the scraper conveyor is established by using MATLAB/Simulink module. The simulation results demonstrate that the permanent magnet direct-driven system can realise smooth starting of the scraper conveyor, and the random load and polygonal sprocket wheel can influence the stability of speed control system.

Postfault Control of Scalar (V/f) Controlled Asymmetrical Six-Phase Induction Machines

With the accelerated development in semiconductor power devices along with the dictated rigorous reliability standards in some industrial sectors, the application of a medium-voltage high-power multiphase induction machine with multiple three-phase windings is now considered as a leading technology in high-power safety-critical applications. This paper proposes a parameter-independent postfault control scheme for an asymmetrical six-phase induction machine based on simple scalar V/f control, which can successfully ensure the most common postfault scenarios used in this respect, namely, equal stator copper loss and minimum copper loss modes. Moreover, the proposed controller can effectively be used in either open-loop or closed-loop speed control modes. The proposed controller is experimentally validated using a 1.5-kW prototype induction machine. The effect of the neutral arrangement on the dynamic performance is also explored.

MASTER-SLAVES SPEED SYNCHRONIZATION OF TRIPLE 3-PHASE INDUCTION MOTORS USING PI AND PID CONTROL METHODS

This paper presents two methods used for three closed loop speed controller of Variable-Voltage Variable Frequency (VVVF) triple 3-phase Induction Motors (IMs) master/slaves system. A dynamic d-q model of a 3-phase IM in state space form and its computer simulation in MATLAB/SIMULINK software package are described. The two different methods of speed control which are used to improve the performance of three IMs drive system are named as conventional PI controller and PID controller. For PID speed controller, simulation results clearly show that the response of the system is superior compared to PI speed controller in terms of rise time, settling time, accuracy and steady state error. The design, analysis, and speed responses of the system obtained under both controllers have been simulated, studied and compared using MATLAB/Simulink environment for different operating conditions such as sudden change in reference speed and load torque. The simulation results showed good synchronization between the master and the slave IMs with suitable tracking error.

Sensorless control of double-sided linear switched reluctance motor based on simplified flux linkage method

The utilization of position sensor reduces the system reliability of switched reluctance motor (SRM), especially in harsh environments. It also increases the complexity of the system. Therefore, the research on sensorless control has become one of the hot spots in recent years. Comparing with the existing sensorless control technology, the new method exploring the sensorless control of double-sided linear switched reluctance motor (DLSRM) shows the following advantages:1)high accuracy , and 2) good practicability. Based on the new proposed method, the DLSRM speed controller is augmented with the peak current method and the voltage chopping closed-loop speed control. Moreover, the winding resistance in the equation is corrected according to the integral flux linkage when the phase current is zero. The accuracy and feasibility of the simplified flux linkage method in estimating the position of the DLSRM is verified.

Model Verification For A Brushed DC Motor Running In Closed Loop With Speed Feedback

In this study, a closed loop speed control of a permanent magnet brushed dc motor is developed. In the first part of the study, the model of the dc motor is obtained and used to simulate a closed loop speed control system using Matlab/Simulink. In the second part, ED laboratory dc motor set is used to implement the simulated system experimentally. The data obtained from experimental study is used to verify simulation results.

Dynamics and Control of Clutchless Automated Manual Transmissions for Electric Vehicles

This paper presents a study of the dynamics and control of clutchless automated manual transmissions (CLAMT) for the purpose of investigating the system behavior during up and down shifts. To achieve this, a multibody dynamic model of the proposed powertrain is implemented to simulate the transient behavior of the system, including a direct current (DC) equivalent model of the electric machine (EM) and a synchronizer mechanism model. Closed-loop control of motor speed and torque is used in conjunction with synchronizer mechanism actuation to functionally achieve gear shifting without the need for a primary friction clutch. This includes nested torque–speed closed-loops to implement alternative motor control functionalities at different stages of gear change. To evaluate the performance of shift control, shift metrics including longitudinal jerk, vibration dose value (VDV), and shifting duration are evaluated from simulation results. These results demonstrate the most significant impact on the transient response of the powertrain results from the reduction and reinstatement of motor torque during shift control. Speed control of the motor during the shift transient directly impacts on the duration of shifting, but not the transient response of the powertrain.

On-Line Parameter Identification of an Induction Motor With Closed-Loop Speed Control Using the Least Square Method

The control system of induction motors is designed to achieve dynamic stability, allowing accurate tracking of flux and speed. However, changes in electrical parameters, due to temperature rise or saturation level, can lead to undesirable errors of speed and position, eventually resulting in instability. This paper presents two modes for parametric identification of the induction motor based on the least squares method: batch estimator and recursive estimator. The objective is to update the electrical parameters during operation when the motor is driven by a vector control system. A drawback related to the batch estimator is the need for high quantity of available memory to make the process of identification robust enough. The proposed algorithm allows the batch estimator to be viewed as a single matrix problem reducing the need for processing memory. The identification procedure is based on the stator currents measurement and stator fluxes estimation. Basically, both modes of identification will be analyzed. Experimental results are presented to demonstrate the theoretical approach.

Controller Design for Closed Loop Speed Control of BLDC Motor

Controller Design for Closed Loop Speed Control of BLDC Motor

Motion Control and Performance Evaluation of a Magnetic-Geared Dual-Rotor Motor in Hybrid Powertrain

The magnetic-geared dual-rotor motor (MGDRM) has been proposed as a power split device for several years, but there is not an evaluation work for an MGDRM in a real hybrid powertrain so far. As a pilot demo, an MGDRM-based hybrid powertrain with a real engine is built and tested in a real hybrid test bench. The closed-loop speed control is developed for the MGDRM, with which two pragmatic functions of the hybrid powertrain are realized by the MGDRM. First, the engine can be started by the MGDRM outer rotor no matter whether the vehicle is parked or traveling. Second, the torque coordination function of the MGDRM can help the engine to stabilize at a fixed work situation. This feature is the basement to adjust the operation and efficiency of engine. The power conversion efficiency map of the MGDRM is tested, based on which the performance of the power split in different operating situations can be evaluated.

Design and implementation methodology for rapid control prototyping of closed loop speed control for BLDC motor

This paper deals with rapid control prototyping implementation of closed loop speed control for a Brushless dc (BLDC) motor drive using dSPACE DS1103 controller board. Generally control algorithms which are developed for the motor drive might show good simulation results during steady state and transient conditions; however real-time performance of the drive greatly depends on execution of real time control software, speed and position measurements and data acquisition. The real challenge of hardware implementation lies in selecting appropriate hardware equipment and perfect configuration of the equipment with controller board. The dSPACE DS1103 controller board is suitable for high performance electric motor control as it has flexibility of converting the MATLAB/Simulink blocks into DSP enabled embedded code. In this paper a detailed procedure to effectively control the BLDC motor drive in real-time is presented.

A novel fuzzy-sliding automatic speed control of intelligent vehicles with adaptive boundary layer

Since the vehicle longitudinal dynamic system inherently has non-linear and time-varying behaviour, it is a challenging work to design an effective automatic speed control strategy to handle the unknown nonlinearities and uncertain parameters. In this paper, a novel adaptive fuzzy sliding automatic speed controller with variable boundary layer for intelligent vehicles is proposed; the control gains and the boundary layer thicknesses of the sliding mode speed controller are adaptively tuned by fuzzy logic simultaneously. Additionally, the stability of the proposed closed-loop automatic speed control system is guaranteed by the Lyapunov theory, and the switching criterion between the throttle and brake actuators is introduced. Finally, the performance of the proposed control scheme is evaluated by simulation and experimental tests, and the results illustrate that the proposed scheme can achieve good tracking performance.

Five-Phase Squirrel-Cage Motor. Construction and Drive Properties

This paper presents the simulation and experimental results of a five-phase squirrel-cage induction motor. The new machine has been designed to operate in a drive system with third harmonic rotor flux injection in order to improve the motor torque utilization. The motor structure, the mathematical model as well as the laboratory prototype have been described. The motor speed-torque characteristics and transients are elaborated Furthermore, the start-up possibility in the case of one or two stator winding faults has been shown as well. The idea of a closed loop speed control with increased load torque is presented.

Modelling and Simulation for Used Genetic Algorithm Method to Speed Control of Three-phase Induction Motor

Optimization techniques are very well-known to improve the performance of Three-phase induction motor (TIM). Inverter and SVPWM method can be used for setting voltage and frequency appropriating with loads requirements. This study deals with the tuning of PID controller parameters to be used TIM. Genetic algorithm is used to tune each parameters of PID speed controller to improve the speed response performance of the TIM. PID-GA aims to minimize the error signal speed of TIM, reduce overshoot, and tune parameters of PID controller. The error signal speed of TIM has objective function from integrated error signal (ISE). Parameters of PID controller from optimization are used to the model of the closed-loop speed control of three-phase induction motor using PID. PID-GA has the best speed response. On the model of the closed-loop speed control of three-phase induction motor using PID, various load torque can result in decreasing flux stator and rotor, increasing current stator and rotor, and decreasing speed of the induction motor.

Single Inverter Fed Speed Sensorless Vector Control of Parallel Connected Two Motor Drive

This paper describes a speed sensorless vector control method of the torque for cost-effective parallel-connected dual induction motor fed by a single inverter. A natural observer with load torque adaptation is employed to estimate the speeds of the same rating induction motors connected in parallel and fed by a single inverter. The speed difference between the two induction motors for unbalanced load conditions is less in natural observer than the conventional adaptive rotor flux observer. Direct field oriented control is used to calculate the rotor angle from the estimated rotor fluxes and the mean rotor flux is kept constant by rotor flux feedback control. The simulation and experimental results of studies are demonstrated for various running conditions to prove the effectiveness of the proposed method. The closed loop speed control operation with inner current control was performed by TMS320F2812 processor.

SLIDING MODE CONTROL WITH DIFFERENT SLIDING SURFACES A COMPARISON ON SPEED CONTROL OF INDUCTION MOTOR

In this paper closed loop speed control of vector controlled Induction motor is described. Sliding Mode Controller (SMC) is used to get the better performance for the closed loop system in the presence of uncertainties and load disturbances. A comparative study is done on Sliding Mode Controller with different sliding surfaces. The sliding surfaces are designed based on PI and PID controllers. The simulation of the closed loop system is done using MATLAB / Simulink and the results are compared. The simulation results verify that the performance of PID based sliding surface is superior compared to that of PI based sliding surfaces.

Closed loop speed control of dc motor using PID controller

Closed loop speed control of dc motor using PID controller

Closed Loop Speed Control Analysis of DC Motor

Closed Loop Speed Control Analysis of DC Motor