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Добірка наукової літератури з теми "Drive stepper"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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Статті в журналах з теми "Drive stepper"

Hu, Mingliang, Wei Han, Wei Gao, and Yang Liu. "Application of two-phase hybrid stepping motor based on three-phase inverter chopping control strategy in aircraft electric drive servo valve." Journal of Physics: Conference Series 2137, no. 1 (December 1, 2021): 012011. http://dx.doi.org/10.1088/1742-6596/2137/1/012011.

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Abstract With the development of multi-/all-electric technology, more and more aircraft platforms use electrically driven servo valves as the driving source to realize real-time adjustments of flow, pressure and temperature in the area network. The new generation of aircraft applies a stepper motor to drive the servo valve as the drive source, and utilizes the holding torque and open-loop control characteristics of the stepper motor when the stepper motor could not meet aircraft’s requirements of the reliability of the servo valve, the controllability of the opening and closing angle, and the environmental resistance. This paper develops a set of stepper motor drive servo valve control system. The system is mainly composed of flight tube bus, electromechanical management computer, remote actuation unit, remote interface unit and motor-driven servo valve. The stepper motor driver is integrated in the remote execution unit and is used to control the two-phase hybrid stepper motor to drive the servo valve. The topology of a three-phase inverter bridge drive is used to achieve the two-phase double four-shot drive, which saves about 25% power drive hardware. By controlling the two-phases motor, the direction and amplitude of the current one can realize micro-step control. The test and simulation result show that the system has higher control accuracy and better acceleration. The deceleration characteristics in two-phase full step and micro step working modes can expand the application of electric servo valve and improve aircraft performance.

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Qiu, Hanyu, and Qi Su. "Simulation Research of Hydraulic Stepper Drive Technology Based on High Speed On/Off Valves and Miniature Plunger Cylinders." Micromachines 12, no. 4 (April 15, 2021): 438. http://dx.doi.org/10.3390/mi12040438.

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The technology for stepper drive that can achieve accurate motion in the hydraulic field has always been urgently needed in the industry. This paper proposes a hydraulic stepper drive based on five high speed on/off valves and two miniature plunger cylinders. The stepper drive discretizes the continuous flow medium into fixed small steps through the miniature plunger cylinder and realizes the state control of the drive through the logic action of the high speed on/off valve. This paper improves the current stepper drive and establishes a mathematical model to analyze the error of the drive and calculate the position of the actuator. In addition, through simulation research, the performance parameters such as the single-step step characteristic and pressure characteristic of the stepper drive are studied. The results show that, compared with the technology of current stepper drive, this stepper drive can effectively remove the “post step” phenomenon, greatly improve the stepper accuracy of the stepper drive, and have a more excellent performance.

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Li, San Bo. "The Application and the Driver Design of Double Axis Step-Drive Electromotor in the Motorcycle Meter." Advanced Materials Research 201-203 (February 2011): 594–99. http://dx.doi.org/10.4028/www.scientific.net/amr.201-203.594.

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The traditional motorcycle meters are driven by the separate motors, these devices are simple and easy to be controlled, stable performance, but dial space has not been fully utilized. This paper introduces the double index show of motorcycle speed and speed，focus on analysis of dual-axis stepper motor driven connections, drive mode and the driver circuit design. The results of experiment and application shows that the coaxial two-pointer motorcycle display instrument has good repeatability, good linear scale, fast response, no jitter, high reliability and relatively small size and many other advantages, instrumentation stepper motor driver with dual-axis motor instrument design meet the relevant requirements of motorcycle meter, can be easily to achieve motor servo system driven synchronous control of double axis step-drive electromotor.

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Yu, Bi Qiong. "Azimuths Scan Servo System Design of the Radar." Applied Mechanics and Materials 321-324 (June 2013): 680–83. http://dx.doi.org/10.4028/www.scientific.net/amm.321-324.680.

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For the special requirements of the radar antenna, a servo system was designed to drive a certain type of weather radar azimuth scan. The control segment consists of the PC and the stepper motor motion control card, in which the stepper motor was used as the actuator and the motor drive circuit was built by the specific integrated driver chips of the stepper motor. By testing the vibration, the shock and the temperature of system, it shows that the designed azimuths scan servo system can meet the requirements of the weather radar azimuth scan.

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Y. Yousef, Ayman, and M. H. Mostafa. "Simulation and Implementation of Multiple Unipolar Stepper Motor Position Control in the Three Stepping Modes using Microcontroller." Indonesian Journal of Electrical Engineering and Computer Science 4, no. 1 (November 4, 2016): 29. http://dx.doi.org/10.11591/ijeecs.v4.i1.pp29-40.

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<p>This paper presents a multiple unipolar stepper motor position control system using microcontroller (MCU) in anticlockwise and clockwise directions. The open loop controller of the implemented position control system for the three stepping modes of operation has been designed and developed with three stepper motors and without position feedback. The MCU is programmed using flowcode software package to generate the pulse signals with the desired stepping sequences and step angles. These pulse signals are necessary to drive the three stepper motors in the three drive modes (wave-step, full-step, and Half-step) according to the control algorithm. Three devices of 8 Channel Darlington Driver (chip ULN2803) are used to drive the three stepper motors and provide them with the sufficient current. The position control system has been simulated using proteus design suite software package and the controller has been implemented using low cost PIC16F877A (MCU). A reliable and accurate position control of the stepper motor is achieved by this position control system. </p>

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Cao, Fa Hai, and Jian Ping Lv. "High Performance Drive Design for Hybrid Stepper Motors." Advanced Materials Research 706-708 (June 2013): 822–25. http://dx.doi.org/10.4028/www.scientific.net/amr.706-708.822.

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A new frequency-voltage modulation drive technique is proposed and analyzed for the use of stepping motor. Hardware circuit and the current compensation control method are given in the article. STM32 MCU control the PWM switch power, and combine L6384 to drive the MOSFET tube which consisting of H-bridge driver circuit. It simplifies the power drive electronic circuit. A high performance drive design about the best of drive curve is used through the analysis and study of the current closed-loop control. It will significantly improve the stability in low frequency and the torque frequency characteristic in high frequency, and the design can be used for high-power automation equipment.

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Cai, Changxin, Yongjun Chen, and Ruiling Ouyang. "Test and Analysis of Stepper Motor’s Noise in HVAC’s Ventilation Valve." Journal of Physics: Conference Series 2095, no. 1 (November 1, 2021): 012063. http://dx.doi.org/10.1088/1742-6596/2095/1/012063.

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Abstract With the application of automotive air conditioning being more popular, higher requirements on automotive air conditioning’s comfort have been put forward, noise is an important criterion about comfort. BDC motor controlling ventilation valve’s noise is mainly caused by brush and commutator, but stepper motor doesn’t have it and stepper motor is cheap and easy-controlling. In this paper, the principle of microstepping drive technology is discussed in detail, the control circuit block diagram and the application of the stepping motor’s control system are introduced. The noise of BDC motor and stepper motor controlling ventilation valve is measured in the semi-anechoic room, BDC motor produces peak noise at the start and stop during the working of motor, stepper motor’s noise is slight and smooth-going; current waveforms have been measured in the microstepping drive, the results show microstepping drive makes current waveform more smooth-going and stepper motor’s noise is lower. So it is a tendance stepper motor will replace BDC motor to control ventilation valve, and the microstepping drive can meet different requirements for merchant’s control.

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Lai, Chiu-Keng, Bo-Wei Lin, Hsiang-Yueh Lai, and Guan-You Chen. "FPGA-Based Hybrid Stepper Motor Drive System Design by Variable Structure Control." Actuators 10, no. 6 (May 28, 2021): 113. http://dx.doi.org/10.3390/act10060113.

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Анотація:

A stepper motor is usually operated in position open-loop control for simplicity. However, in order to improve the transient and steady-state performances of the stepper motor-based drive system, a high performance stepper motor drive system is usually designed to feed the encoder signal back to form a closed-loop system such as a general servo motor drive, and high-performance position and speed loop controller can then be used to overcome the nonlinear characteristics of the motor, such as the cogging force and impacts from external load. On the other hand, the existed cogging force of the hybrid stepper motor must be solved to increase the positioning precision. The variable structure control (VSC) is insensitive to the bounded uncertainty and load disturbance, and has been known as a high-performance controller. A predefined sliding surface is used to shape the system performances, and incorporate with switching control to achieve the robustness property. Thus, we applied the VSC to implement the stepper motor drive system about the position and speed control, and the switching control is used to overcome the cogging force. The field programmable gate array (FPGA) is a good alternative to be used to realize a motor drive system by considering its programmable ability and diverse designing environment. It is easily developed as an intellectual property (IP) for future use or combined as a part of a large control system. This paper showed the procedures to develop the hardware circuits for the variable structure controller, and applied it to stepper motor position and velocity control. Functions such as PI controllers, dq-axis transformation and two-phase space vector space vector modulation (SVPWM) designed for the stepper motor drives are also shown in the paper. The system simulation and hardware circuit realization are based on MATLAB/Simulink, and realized on Altera FPGA. Simulations on MATLAB/Simulink with trapezoidal velocity profile command, and experiments with and without the load added are shown to demonstrate the hardware performances and correctness.

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Han, Jian Bing, and Jian Jun Cai. "A Kind of Experiment System Design of Stepping Motor." Advanced Materials Research 1079-1080 (December 2014): 935–37. http://dx.doi.org/10.4028/www.scientific.net/amr.1079-1080.935.

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Thispaper designs a set of experiment system for stepper motor, the control system ofstepping motor is composed of stepper controller, drive and stepper motor, withthe single chip processor as the stepper motor controller to realize the morecomplex stepper motor control function. This system has got good teachingeffect in experiment teaching.

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Sarhan, Hussein. "PLC-controlled stepper motor drive for NC positioning system." International Journal of Engineering & Technology 3, no. 3 (June 20, 2014): 298. http://dx.doi.org/10.14419/ijet.v3i3.2796.

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Анотація:

In this paper, an electric drive system for precision control of numerically-controlled positioning system is designed, assembled and experimentally tested. The proposed drive system is based on PLC-controlled stepper motor. The PLC is used as an indexer to perform full stepping, half stepping and microstepping modes of operation of stepper motor. The drive system has been implemented in two-axes NC positioning system. The linear displacement for each machine axis has been evaluated and compared for the three stepping modes of stepper motor. Experimental and calculation results show that the response per pulse (resolution) for full stepping mode is , for half stepping mode is and for microstepping mode is , which means that the microstepping mode is the best one for precision control of NC positioning system. Keywords: Electric Drive, NC Positioning System, PLC, Stepper Motor, Stepping Mode.

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Дисертації з теми "Drive stepper"

Скворчевський, Олександр Євгенович, та Христина Михайлівна Віленська. "Електрогідравлічні мехатронні модулі поступального руху: історія, сучасний стан, перспективи розвитку". Thesis, Харківський національний автомобільно-дорожній університет, 2014. http://repository.kpi.kharkov.ua/handle/KhPI-Press/28258.

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Метою робота є аналіз існуючих електрогідравлічних мехатронних модулів поступального руху, виявлення основних напрямків їх розвитку та перспектив подальшого вдосконалення. В результаті прослідковано еволюцію таких систем. Запропоноване схемне рішення мехатронного модуля для проведення подальших науково-дослідних та проектно-конструкторських робіт в цьому напрямку.
The aim is to analyze existing electro-mechatronic modules translational motion, identifying the main areas of development and prospects for further improvement. The result followed the evolution of such systems. The proposed schematics mechatronic module for further research and design work in this direction.

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Мартиняк, Максим Олександрович, Максим Сергійович Матлага, Maksym Martynyak та Maksym Matlaga. "Розробка автоматизованої системи керування опорно-поворотними пристроями опромінювальних установок". Bachelor's thesis, Тернопіль, ТНТУ, 2021. http://elartu.tntu.edu.ua/handle/lib/35413.

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Роботу виконано на кафедрі ком’пютерно-інтегрованих технологій Тернопільського національного технічного університету імені Івана Пулюя Міністерства освіти і науки України Захист відбудеться 23 червня 2021 р. о 09 .00 годині на засіданні екзаменаційної комісії № 23 у Тернопільському національному технічному університеті імені Івана Пулюя за адресою: 46001, м. Тернопіль, вул.Руська, 56, навчальний корпус №1, ауд. 403
МартинякМ.О, Матлага М.С.Розробка автоматизованої системи керування опорно-поворотними пристроями опромінювальних установок. 151 –Автоматизація та комп’ютерно-інтегровані технології. –Тернопільський національний технічний університет імені Івана Пулюя. –Тернопіль, 2021. У кваліфікаційній роботі було проведено аналіз можливих варіантів виконання силової установки опорно-поворотних пристроїв базового блоку керування. Обґрунтовано вибір в цій якості дискретного електроприводу. На основі розрахунку електродинамічних характеристик вантажу вибрано для ланок опорно-поворотних пристроїв крокові двигуни та технологічну схему їх блоку живлення.
Martynyak M.O., Matlaga M.S. Development of an automatic control system of an irradiation unit supportingrotating devices. 151 - Automation and computer integrated technologies. - Ivan Puliuyi Ternopil National Technical University. - Ternopil, 2021. In the qualification work the analysis of possible variants of execution of power installation of basic and rotary devices of the basic control unit was carried out. The choice of a discrete electric drive in this capacity is substantiated. Based on the calculation of the electrodynamic characteristics of the load, stepper motors and the technological scheme of their power supply are selected for the links of the support and rotary devices.
Вступ 7 1. АНАЛІТИЧНА ЧАСТИНА 8 1.1. Аналіз цифрових слідкуючих електроприводів 8 1.2. Огляд елементів цифрових слідкуючих приводів 12 1.3. Огляд типових схем цифрових слідкуючих приводах 16 1.4. Імпульсні цифрові слідкуючі приводи 18 2. ПРОЕКТНА ЧАСТИНА 23 2.1. Порівняльна оцінка приводів для опорно-поворотних пристроїв опрмінювальних установок 23 2.2. Вибір крокових двигунів для кінематичних пар опорно-поворотних пристроїв опрмінювальних установок 25 2.3. Вибір структурної схеми системи керування 30 2.4. Вибір схеми і розрахунок підсилювача потужності 35 2.5. Вибір та розрахунок блоків живлення 50 3. СПЕЦІАЛЬНА ЧАСТИНА 55 3.1. Розробка програмного забезпечення для мікроЕОМ системи керування опорно-поворотними пристроями опрмінювальних установок 55 4. БЕЗПЕКА ЖИТТЄДІЯЛЬНОСТІ, ОСНОВИ ХОРОНИ ПРАЦІ 60 Висновки 68 Перелік посилань 69

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Denisov, Alexey. "Stepper microactuators driven by ultrasonic power transfer." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/12818.

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Advances in miniature devices for biomedical applications are creating ever-increasing requirements for their continuous, long lasting, and reliable energy supply, particularly for implanted devices. As an alternative to bulky and cost inefficient batteries that require occasional recharging and replacement, energy harvesting and wireless power delivery are receiving increased attention. While the former is generally only suited for low-power diagnostic microdevices, the latter has greater potential to extend the functionality to include more energy demanding therapeutic actuation such as drug release, implant mechanical adjustment or microsurgery. This thesis presents a novel approach to delivering wireless power to remote medical microdevices with the aim of satisfying higher energy budgets required for therapeutic functions. The method is based on ultrasonic power delivery, the novelty being that actuation is powered by ultrasound directly rather than via piezoelectric conversion. The thesis describes a coupled mechanical system remotely excited by ultrasound and providing conversion of acoustic energy into motion of a MEMS mechanism using a receiving membrane coupled to a discrete oscillator. This motion is then converted into useful stepwise actuation through oblique mechanical impact. The problem of acoustic and mechanical impedance mismatch is addressed. Several analytical and numerical models of ultrasonic power delivery into the human body are developed. Major design challenges that have to be solved in order to obtain acceptable performance under specified operating conditions and with minimum wave reflections are discussed. A novel microfabrication process is described, and the resulting proof-of-concept devices are successfully characterized.

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Stout, Adrian John. "Instrumentation techniques and improved control of stepper motor driven machinery." Thesis, Open University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312262.

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Armonas, Simas. "Geodezinių prietaisų pozicionavimo sistemos tyrimas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2009. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2009~D_20090708_141304-66230.

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Baigiamajame magistro darbe nagrinėjama ir modernizuojama Geodezijos institute naudojamo įtaiso, skirto geodezijos prietaisams kalibruoti, žingsninė pavara. Stende naudojama pavara nebeatitinka reikalaujamo tikslumo, ir neišvysto reikiamo greičio. Darbo tikslas – modernizuoti pozicionavimo pavarą (padidinti jos greitį ir tikslumą). Teorinėje dalyje aptariamas geodezijos prietaisų kalibravimo stendo veikimo principas, naudojama kalibravimo metodika, atliekamas žingsninio variklio dinaminių charakteristikų skaičiavimas. Eksperimentinėje dalyje pateikiamos principinė ir funkcinė modernizuotos pavaros valdiklio schemos. Taip pat nagrinėjamas pavaros valdymo algoritmas, pateikiamos esminės mikrovaldiklio programos dalys. Čia atliekama pavaros darbo režimų analizė, nagrinėjama mikrožingsnio svarba pavaros greičiui bei tikslumui. Modernizuotoje pavaroje naudojami moderniausi žingsninių pavarų valdymo metodai, pavaros tikslumas padidėjo 30 kartų.
This postgraduate thesis is about analysis and modernization of positioning gear, used in geodesic equipment. Old gear used in the rig is very slow and not accurate. Mission of this work is to make gear faster and more accurate. The theoretical path consists of geodesic equipment calibration methods, principles of rig operation, analysis of stepper motor dynamic characteristics. Experimental path consists of: principal and function diagrams of stepper gear driver, program algorithms, and parameters investigation of all working modes of the gear. The most modern methods is used in renewed gear, the precision increased 30 times.

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Hořák, Jan. "Řízení krokových motorů se zpětnou vazbou." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221247.

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The theme of this thesis is the design and optimization of algorithms for controlling stepper motors with feedback by measuring the BEMF. The emphasis was on self-management stepper motor current depending on the load. To verify the algorithm was designed and built sample devices with integrated circuit NCV70514 from ON Semiconductor. The result is a sample device, the control program and algorithm to control a stepper motor.

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Půhoný, Jan. "Návrh speciálního anténního rotátoru." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218591.

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This master's thesis deals with design electronics for an antenna rotator in two axis. There are designed and implemented drivers for two stepper motors. Was also designed and implemented control panel that allows manual control the rotator and remote control by PC via USB. At the same time created software for control panel and PC application for easy operation.

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Ludva, Stanislav. "Návrh a výroba modulu pro řízení motorů na nízká napětí." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-317187.

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The aim of this diploma thesis is to design and implement a universal driver unit designed to control electric motors of small voltages – electronically commutated, DC and stepper. This involves creating topology and selecting appropriate components based on the required parameters. It also includes the manufacture of printed circuit board (PCB), soldering of the components and programming of the necessary functions. Thesis contains the analysis of three selected types of motors – the principle of operation, wiring and control. Testing of the control unit was performed at the end of the work.

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Thammanna, Gurumurthy Vignesh [Verfasser], Cameron [Akademischer Betreuer] Tropea, Stephen [Akademischer Betreuer] Garoff, and Ilia V. [Akademischer Betreuer] Roisman. "Dynamics of corner flows driven by wettability / Vignesh Thammanna Gurumurthy ; Cameron Tropea, Stephen Garoff, Ilia V. Roisman." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2018. http://d-nb.info/1168380898/34.

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Lang, Stanislav. "Automatický tester HMI." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219324.

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This thesis is dedicated to the automation of tests of the thermostats developed by the company Honeywell. The first chapter presents a problem of self-testing of thermostats, followed by a discussion of possible approaches to solutions. Attention is paid to testing the functionality of the HMI of thermostats, especially to the part of the system, that deals with activation of touchscteen, but no other part of the problem are omitted in the text. Discussions of the problematic passes into the design and implementation of specific design solutions. The selected design of 3D-router, which moves in three orthogonal coordinates and resembles to a coordinate drill for example. First, it describes the basic concepts of mechanic and electronic part of equipment, and subsequently is designed and implemented control electronics for mechanical activator HMI. Each of the electronics components are described in detail and values of parts are based on the calculation with the exception of finished parts. The proposal of the electronics follows the possibility of maximization of universality module for applications in similar applications. The functionality of the electronics is controlled by a microprocessor with a custom program that is described in the work. Source code of some the programs is not available because it is know-how of the company. Next part of the thesis deals with optimization of the moving of axes, optimization is done empirically by measuring. An important issue is compliance with the accuracy required position, also part of the work is devoted to the issue of calibration position. Finally is solved the continuity on the superior system. It is designed and implemented the upper layer of the communication protocol used in the company. Work is the solution of specific corporate award thesis. Although it is a very specific role of the works are generally applicable for other applications. In particular, the proposed electronic represents relatively universal controller for stepper motor control.

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Книги з теми "Drive stepper"

Harmonics Reduction in Stepper Motor Drive Using Fuzzy Logic Controller. Tiruchengode, India: ASDF International, 2017.

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Recommendations for Implementing Antimicrobial Stewardship Programs in Latin America and the Caribbean: Manual for Public Health Decision-Makers. Organización Panamericana de la Salud, 2018. http://dx.doi.org/10.37774/9789275120408.

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As a public good, antimicrobial medicines require rational use if their effectiveness is to be preserved. However, up to 50% of antibiotic use is inappropriate, adding considerable costs to patient care, and increasing morbidity and mortality. In addition, there is compelling evidence that antimicrobial resistance is driven by the volume of antimicrobial agents used. High rates of antimicrobial resistance to common treatments are currently reported all over the world, both in health care settings and in the community. For over two decades, the Region of the Americas has been a pioneer in confronting antimicrobial resistance from a public health perspective. However, those efforts need to be stepped up if we are to have an impact on antimicrobial resistance and want to quantify said impact.

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Stein, Stephen J. Jonathan Edwards’ Reflections on the Virgin Mary. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190249496.003.0011.

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Stephen J. Stein focuses on Jonthan Edwards’ treatment of a figure in the New Testament, the Virgin Mary. He highlights a striking irony in Edwards’ exegesis by juxtaposing his steady criticism of the Roman Catholic Church against his high praise of Mary. Stein’s essay is driven by immersion in Edwards’ biblical notebooks, which gives readers a taste of Edwards’ engagement with the Bible and his subsequent theological development from that exegesis. Stein especially highlights how Edwards linked the Virgin Mary to the life of Jesus Christ and the larger story of salvation. Although this question clearly centers on the New Testament, Edwards brings Old Testament passages to bear on it, which illustrates his canonical approach to interpreting Scripture.

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McNeil, Bryan T. Fighting Back … Again. University of Illinois Press, 2017. http://dx.doi.org/10.5406/illinois/9780252036439.003.0003.

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This chapter introduces Coal River Mountain Watch (CRMW) as an organization and describes its formation, organization and growth over the first five to seven years of its existence. The outrage that greeted mountaintop removal coal mining in the late 1990s was by no means new to the Appalachian region. Time and again conditions of social relations and political and economic domination have given rise to reform movements. Author Stephen Fisher argues that for an enduring social movement to achieve substantive change in Appalachia, it must transcend single issues in ongoing, democratic, membership-driven organizations. He cited groups like Save Our Cumberland Mountains in Tennessee, Kentuckians for the Commonwealth, and the Ohio Valley Environmental Coalition as existing examples of the activism he described.

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Feigel, Lara. Fiction during the Second World War. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198749394.003.0004.

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This chapter focuses on home front literature and concentrates particularly on literature portraying the wartime experience in London. The majority of war literature was produced by authors who had remained in London. These tended to be non-combatants, but played an often major role in the ARP (Air Raid Protection) services, defending their city. Henry Green, William Sansom, and Stephen Spender worked as firemen; Elizabeth Bowen and Graham Greene as ARP wardens; and Rose Macaulay as an ambulance driver. This was a community of writers who were facing danger and defending their city, rather like the soldier poets in the trenches in the First World War. These authors had direct experience of the various periods of bombing, as well as of the peculiar hiatus when the war carried on elsewhere.

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Kopley, Emily. Virginia Woolf and Poetry. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198850861.001.0001.

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Virginia Woolf’s career was shaped by her impression of the conflict between poetry and the novel, a conflict she often figured as one between masculine and feminine, old and new, bound and free. In large part for feminist reasons, Woolf promoted the triumph of the novel over poetry, even as she adapted some of poetry’s techniques for the novel in order to portray the inner life. Woolf considered poetry the rival form to the novel. A monograph on Woolf’s sense of generic rivalry thus offers a thorough reinterpretation of the motivations and aims of her canonical work. Drawing on unpublished archival material and little-known publications, the book combines biography, book history, formal analysis, genetic criticism, source study, and feminist literary history. Woolf’s attitude toward poetry is framed within contexts of wide scholarly interest: the decline of the lyric poem, the rise of the novel, the gendered associations with these two genres, elegy in prose and verse, and the history of English Studies. Written in clear and lively language, the book maintains a narrative drive as it traces Woolf’s reading and writing over her lifetime, including her response to poets and critics in her circle such as J. K. Stephen, Julian Bell, Vita Sackville-West, Sir Arthur Quiller-Couch, T. S. Eliot, Stephen Spender, and W. H. Auden. Virginia Woolf and Poetry makes three important contributions. It clarifies a major prompt for Woolf’s poetic prose. It exposes the generic rivalry that was creatively generative to many modernist writers. And it details how holding an ideology of a genre can shape literary debates and aesthetics.

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Частини книг з теми "Drive stepper"

Edwards, J. D. "Stepper Motor Drives." In Electrical Machines and Drives, 213–26. London: Macmillan Education UK, 1991. http://dx.doi.org/10.1007/978-1-349-21313-9_9.

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Flurry, Greg. "A Stepper Motor Driver." In Java on the Raspberry Pi, 413–39. Berkeley, CA: Apress, 2021. http://dx.doi.org/10.1007/978-1-4842-7264-0_13.

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Richards, Keith L. "Introduction to Stepper Motors and Their Drives." In Design Engineer's Sourcebook, 1095–105. Boca Raton : Taylor & Francis, CRC Press, 2018.: CRC Press, 2017. http://dx.doi.org/10.1201/9781315367514-46.

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Ctibor, Jiri, and Ivo Pazdera. "The New Stepper Driver for Low-Cost Arduino Based 3D Printer with Dynamic Stepper Control." In Advances in Intelligent Systems and Computing, 458–66. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-65960-2_57.

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Gevorkov, Levon, Vaclav Smidl, and Martin Sirovy. "Stepper Motor Based Model of Electric Drive for Throttle Valve." In Proceedings of the 29th International DAAAM Symposium 2018, 1102–7. DAAAM International Vienna, 2018. http://dx.doi.org/10.2507/29th.daaam.proceedings.157.

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Shafik, Amro, and Salah Haridy. "An Integrated Design for a CNC Machine." In Advances in Systems Analysis, Software Engineering, and High Performance Computing, 254–65. IGI Global, 2014. http://dx.doi.org/10.4018/978-1-4666-6252-0.ch013.

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Computer Numerical Control (CNC) is a technology that converts coded instructions and numerical data into sequential actions that describe the motion of machine axes or the behavior of an end effector. Nowadays, CNC technology has been introduced to different stages of production, such as rapid prototyping, machining and finishing processes, testing, packaging, and warehousing. The main objective of this chapter is to introduce a methodology for design and implementation of a simple and low-cost educational CNC prototype. The machine consists of three independent axes driven by stepper motors through an open-loop control system. Output pulses from the parallel port of Personal Computer (PC) are used to drive the stepper motors after processing by an interface card. A flexible, responsive, and real-time Visual C# program is developed to control the motion of the machine axes. The integrated design proposed in this chapter can provide engineers and students in academic institutions with a simple foundation to efficiently build a CNC machine based on the available resources. Moreover, the proposed prototype can be used for educational purposes, demonstrations, and future research.

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Platin, B. E., and B. Çelik. "MODELLING AND ANALYSIS OF A STEPPER MOTOR DRIVEN FEED-DRIVE SYSTEM OF A CNC LATHE." In Microcomputer Application in Process Control, 237–41. Elsevier, 1987. http://dx.doi.org/10.1016/b978-0-08-034340-2.50044-3.

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Crowder, Richard. "Stepper motors." In Electric Drives and Electromechanical Systems, 209–26. Elsevier, 2020. http://dx.doi.org/10.1016/b978-0-08-102884-1.00008-x.

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Crowder, Richard. "Stepper motors." In Electric Drives and Electromechanical Systems, 215–33. Elsevier, 2005. http://dx.doi.org/10.1016/b978-075066740-1/50009-0.

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"Switched reluctance and stepper motor drives." In Control Techniques, Drives and Controls Handbook, 261–94. Institution of Engineering and Technology, 2009. http://dx.doi.org/10.1049/pbpo057e_cha8.

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Тези доповідей конференцій з теми "Drive stepper"

Tarnini, Mohamed Y. "Fast and cheap stepper motor drive." In 2015 International Conference on Renewable Energy Research and Applications (ICRERA). IEEE, 2015. http://dx.doi.org/10.1109/icrera.2015.7418499.

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Gradl, Christoph, Ivo Kovacic, and Rudolf Scheidl. "Development of an Energy Saving Hydraulic Stepper Drive." In 8th FPNI Ph.D Symposium on Fluid Power. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fpni2014-7809.

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Stepper drives can realize quite precise, incremental motions without position sensors. Sensorless hydraulic motion control is strongly demanded by industry and, therefore, is an established idea in hydraulics for a while. Some concepts have been proposed in the past and a few of them have also been realized and applied in specific cases. But it is expected that digital hydraulics — due to its intrinsic discrete nature — can create new, more advantageous hydraulic versions of stepper drives. In this paper, a new stepper drive is presented and investigated. It creates the steps by fixed fluid quanta generated by a so called digital flow unit. That unit is realized by a hydraulic cylinder-piston unit which displaces a defined fluid quantum by each limited forward stroke of that piston. The unit is controlled by a fast switching valve which connects the piston areas alternately with the pressure-, tank- and output-line. The return motion is generated by a return spring. Energy saving is accomplished by storing the supply pressure surplus intermediately in the kinetic energy of the piston and converting that energy to displace part of the quantum to the consumer line without hydraulic energy from the supply line. Different detail concepts of this stepper drive are theoretically assessed. The transient behavior, the performance characteristics and the energy efficiency of a preferred concept are investigated by mathematical modeling and simulation. Furthermore, the main system parameters are identified and corresponding basic dimensioning rules are presented. In a second step, the influence of finite switching times of the valves, the hydraulic impedances of the various flow channels and of the dead volumes and the dynamical properties of the hydraulic cylinder attached to the device, are discussed.

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Gradl, Christoph, Ivo Kovacic, and Rudolf Scheidl. "Simulation and Experimental Investigations of a Hydraulic Stepper Drive." In ASME/BATH 2015 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/fpmc2015-9504.

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This paper presents simulation and experimental results of an energy saving hydraulic stepper drive prototype. Different concepts, advantages and the mechanical design of such kind of stepper drive were discussed in a previous publication. The excellent efficiency, the possibility of energy recuperation, and the control by switching and check valves only, may help to open new applications for hydraulic drives. Also the flow rate can be controlled rather directly by adjusting the switching frequency. This characteristic makes the sensorless position and speed control relatively easy. The drive is realized by a hydraulic cylinder piston unit which displaces a defined fluid quantum by the limited forward stroke of the piston controlled by a fast switching valve. This end to end motion of the piston in its cylinder generates a precise, incremental motion of an additional load cylinder; this enables a sensorless position control. Energy saving is achieved by storing the pressure surplus intermediately in the kinetic energy of the piston to displace a part of the fluid quantum without hydraulic energy from the supply line. A detailed simulation model of a stepper drive including transmission lines, flow channels, hydraulic accumulators and valve dynamics is applied to analyze the experimental results. This dynamic model in connection with the prototype allows to identify the potential for improvement. The different ways to improve the behavior are reviewed, in particular concerning energy losses: bearing friction, leakages in gaps, pressure losses and backflow through check valves. The measured dynamic characteristics and the energy efficiency are presented and compared to the simulation results. The preliminary results showed that the energy efficiency can be drastically increased by a better piston sealing and guidance system and faster check valves. Hence, the development of a fast plate type check valve for the hydraulic stepper drive is also proposed in this study.

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Shi, Rongrong, and Jing Luo. "Stepper Motor Drive Control Based on MCU." In 2011 International Conference on Control, Automation and Systems Engineering (CASE). IEEE, 2011. http://dx.doi.org/10.1109/iccase.2011.5997695.

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Sherring da Rocha, Paulo Augusto, and Maria Emilia de Lima Tostes. "Stepper motor drive for computer numerical control machines." In 2013 Brazilian Power Electronics Conference (COBEP 2013). IEEE, 2013. http://dx.doi.org/10.1109/cobep.2013.6785223.

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Mirbagheri, S. E., M. Al-Bassyiouni, and A. Dasgupta. "Bearing wear model for optical disk drive stepper motor." In 2012 13th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm). IEEE, 2012. http://dx.doi.org/10.1109/itherm.2012.6231568.

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Nguyen, Vinh Quang, Nhan Van Phan Tran, Hoang Ngoc Tran, Kien Minh Le, and Jae Wook Jeon. "A closed-loop stepper motor drive based on EtherCAT." In IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2017. http://dx.doi.org/10.1109/iecon.2017.8216569.

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Lekshmi, V., B. K. S. V. L. Varaprasad, G. Navle Sonal, and T. S. Vishnu. "Configurable Drive Scheme for Stepper Motors in Space Application." In 2022 First International Conference on Electrical, Electronics, Information and Communication Technologies (ICEEICT). IEEE, 2022. http://dx.doi.org/10.1109/iceeict53079.2022.9768461.

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Ren, Hui, Chaohui Lü, Zhibin Su, and Jingjing Zhang. "Stepper Motor Drive of Stage Intelligent Light Based on Embedded." In 2010 International Conference on Measuring Technology and Mechatronics Automation (ICMTMA 2010). IEEE, 2010. http://dx.doi.org/10.1109/icmtma.2010.263.

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Patel, Archan, K. S. Denpiya, A. N. Patel, and S. H. Chetwani. "Novel microstepping technique for disc rotor type stepper motor drive." In Energy Conference (IPEC 2010). IEEE, 2010. http://dx.doi.org/10.1109/ipecon.2010.5696953.

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Tamale, Nona. Adding Fuel to Fire: How IMF demands for austerity will drive up inequality worldwide. Oxfam, August 2021. http://dx.doi.org/10.21201/2021.7864.

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The COVID-19 pandemic has dealt a huge blow to every country, and many governments have struggled to meet their populations’ urgent needs during the crisis. The International Monetary Fund (IMF) has stepped in to offer extra support to a large number of countries during the pandemic. However, Oxfam’s analysis shows that as of 15 March 2021, 85% of the 107 COVID-19 loans negotiated between the IMF and 85 governments indicate plans to undertake austerity once the health crisis abates. The findings in this briefing paper show that the IMF is systematically encouraging countries to adopt austerity measures once the pandemic subsides, risking a severe spike in already increased inequality levels. A variety of studies have revealed the uneven distribution of the burden of austerity, which is more likely to be shouldered by women, low-income households and vulnerable groups, while the wealth of the richest people increases. Oxfam joins global institutions and civil society in urging governments worldwide and the IMF to focus their energies instead on a people-centred, just and equal recovery that will fight inequality and not fuel it. Austerity will not ‘build back better’.

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