4,422 research outputs found
A test-rig to evaluate a dual-3-phase induction motor drive
The potential advantages of multi-phase solutions over
the conventional 3-phase ones have been widely
described in the literature. However, their feasibilities
and performances have been poorly described and
proven. The main goal of this paper is the design and
implementation of a test rig to evaluate some control
policies for a double-3-phase induction motor drive, a
multiphase drive with interest in Electric Vehicle (EV)
applications
The use of microorganisms in dairy products (butter)
Butter is widely used in cooking and
baking, particularly by those who enjoy cakes and
sweets. Butter is categorized as a dairy product
which is made from fat and protein. Biotechnology
knowledge is applied in the process of making
butter because it involves microorganisms such as
bacteria, yeast, fungi, marine diatoms and
protozoa. The steps in the process of making butter
include separating raw milk, skim, pasteurization,
storage, evaporation, and drying. The
neutralization of butter cream is vital in lowering
the acidity of cream, which prevents unpleasant
odors
FPGA design methodology for industrial control systems—a review
This paper reviews the state of the art of fieldprogrammable gate array (FPGA) design methodologies with a focus on industrial control system applications. This paper starts with an overview of FPGA technology development, followed by a presentation of design methodologies, development tools and relevant CAD environments, including the use of portable hardware description languages and system level programming/design tools. They enable a holistic functional approach with the major advantage of setting up a unique modeling and evaluation environment for complete industrial electronics systems. Three main design rules are then presented. These are algorithm refinement, modularity, and systematic search for the best compromise between the control performance and the architectural constraints. An overview of contributions and limits of FPGAs is also given, followed by a short survey of FPGA-based intelligent controllers for modern industrial systems. Finally, two complete and timely case studies are presented to illustrate the benefits of an FPGA implementation when using the proposed system modeling and design methodology. These consist of the direct torque control for induction motor drives and the control of a diesel-driven synchronous stand-alone generator with the help of fuzzy logic
Advanced control system for stand-alone diesel engine driven-permanent magnetic generator sets
The main focus is on the development of an advanced control system for variable speed standalone
diesel engine driven generator systems.
An extensive literature survey reviews the historical development and previous relevant
research work in the fields of diesel engines, electrical machines, power electronic converters,
power and electronic systems. Models are developed for each subsystem from mathematical
derivations with necessary simplifications made to reduce complexity while retaining the
required accuracy. Initially system performance is investigated using simulation models in
Matlab/Simulink.
The AC/DC/AC power electronic conversion system used employs a voltage controlled dc
link. The ac voltage is maintained at constant magnitude and frequency by using a dc-dc
converter and a fixed modulation ratio VSI PWM inverter. The DC chopper provides fast
control of the output voltage by dealing efficiently with transient conditions.
A Variable Speed Fuzzy Logic Core (VSFLC) controller is combined with a classical control
method to produce a novel hybrid controller. This provides an innovative variable speed
control that responds to both load and speed changes. A new power balance based control
strategy is proposed and implemented in the speed controller.
Subsequently a novel overall control strategy is proposed to co-ordinate the hybrid variable
speed controller and chopper controller to provide overall control for both fast and slow
variations of system operating conditions.
The control system is developed and implemented in hardware using Xilinx Foundation
Express. The VHDL code for the complete control system design is developed and the
designs are synthesised and analysed within the Xilinx environment. The controllers are
implemented with XC95108-PC84 and XC4010-PC84 to provide a compact and cheap control
system. A prototype experimental system is described and test results are obtained that show
the combined control strategy to be very effective. The research work makes contributions in
the areas of automatic control systems for diesel engine generator sets and CPLD/FPGA
application that will benefit manufacturers and consumers.EPSR
FPGAs in Industrial Control Applications
The aim of this paper is to review the state-of-the-art of Field Programmable Gate Array (FPGA) technologies and their contribution to industrial control applications. Authors start by addressing various research fields which can exploit the advantages of FPGAs. The features of these devices are then presented, followed by their corresponding design tools. To illustrate the benefits of using FPGAs in the case of complex control applications, a sensorless motor controller has been treated. This controller is based on the Extended Kalman Filter. Its development has been made according to a dedicated design methodology, which is also discussed. The use of FPGAs to implement artificial intelligence-based industrial controllers is then briefly reviewed. The final section presents two short case studies of Neural Network control systems designs targeting FPGAs
A programmable microsystem using system-on-chip for real-time biotelemetry
A telemetry microsystem, including multiple sensors, integrated instrumentation and a wireless interface has been implemented. We have employed a methodology akin to that for System-on-Chip microelectronics to design an integrated circuit instrument containing several "intellectual property" blocks that will enable convenient reuse of modules in future projects. The present system was optimized for low-power and included mixed-signal sensor circuits, a programmable digital system, a feedback clock control loop and RF circuits integrated on a 5 mm × 5 mm silicon chip using a 0.6 μm, 3.3 V CMOS process. Undesirable signal coupling between circuit components has been investigated and current injection into sensitive instrumentation nodes was minimized by careful floor-planning. The chip, the sensors, a magnetic induction-based transmitter and two silver oxide cells were packaged into a 36 mm × 12 mm capsule format. A base station was built in order to retrieve the data from the microsystem in real-time. The base station was designed to be adaptive and timing tolerant since the microsystem design was simplified to reduce power consumption and size. The telemetry system was found to have a packet error rate of 10<sup>-</sup><sup>3</sup> using an asynchronous simplex link. Trials in animal carcasses were carried out to show that the transmitter was as effective as a conventional RF device whilst consuming less power
Direct torque control for dual three-phase induction motor drives
A direct torque control (DTC) strategy for dual three-phase induction motor drives is discussed in this paper. The induction machine has two sets of stator three-phase windings spatially shifted by 30 electrical degrees. The DTC strategy is based on a predictive algorithm and is implemented in a synchronous reference frame aligned with the machine stator flux vector. The advantages of the discussed control strategy are constant inverter switching frequency, good transient and steady-state performance, and low distortion of machine currents with respect to direct self-control (DSC) and other DTC schemes with variable switching frequency. Experimental results are presented for a 10-kW DTC dual three-phase induction motor drive prototype
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