Dissertations / Theses on the topic 'Cooling system for a traction motor'

Дисертація на здобуття наукового ступеня доктора технічних наук за спеціальністю 05.22.09 "Електротранспорт" - Національний технічний університет "Харківський політехнічний інститут" МОН України, Харків, 2018. Дисертація присвячена створенню наукових основ щодо вибору оптимальних параметрів та режимів роботи систем охолодження асинхронних тягових двигунів електротранспорту. Розроблений алгоритм рішення рівняння Гамільтона-Якобі-Беллмана для задачі руху електрорухомого складу на ділянці шляху із заданим профілем і графіком руху, що дозволяє створити експертну систему управління рухом. Особливостями цього алгоритму є застосування штрафних функцій для опису обмежень, що накладаються графіком руху: досягнення потягом кінцевого пункту за заданий час руху, обмеження швидкості на ділянках шляху, а також відсутність простоїв потягу в процесі руху. Єдиний підхід штрафних функцій застосований також для введення обмежень по зчепленню. Такий підхід дозволяє значно понизити витрати розрахункового часу і спростити процедури розрахунку витрат енергії. Створена математична модель для визначення ефективності тягового приводу. Модель включає в себе визначення основних втрат у асинхронного тягового двигуна з урахуванням насичення магнітної системи, що визначається за результатами вирішення рекурентного нелінійного рівняння. Також у моделі враховані втрати від вищих гармонік напруги в міді та сталі, а також механічні та додаткові втрати. В розробленій моделі враховуються статичні та динамічні втрати у IGBT транзисторах та діодах напівпровідникового перетворювача. Розроблено метод оптимізації параметрів та режимів роботи систем охолодження асинхронних тягових двигунів електрорухомого складу, якій складається з наступних основних етапів: визначення оптимальних режимів роботи тягового приводу на основі запропонованого виразу ефективності тягового приводу; визначення оптимальних режимів руху електрорухомого складу за критерієм мінімуму витрат; вирішення тягової задачі руху на ділянці колії с заданим графіком руху та профілем колії, а також визначенням залежності зміни втрат в елементах тягового двигуна за часом; вибору параметрів та режимів роботи систем охолодження тягових двигунів, які обумовлюють ефективність системи охолодження та вентиляції електрорухомого складу; вирішення задачі умовної мінімізації системи охолодження тягового двигуна за модернізованим критерієм економічної ефективності на основі методу Вейля за узагальненим золотим перетином та задачі аналізу системи вентиляції і охолодження тягових двигунів, яка створена на базі математичної моделі теплових режимів двигуна за узагальненою еквівалентною тепловою схемою.
Thesis for the degree of Doctor of Engineering in specialty 05.22.09 "Electric transport " - National Technical University "Kharkiv Polytechnic Institute" MES of Ukraine, Kharkov, 2018. The thesis is devoted to the creation of scientific foundations for the selection of optimal parameters and operating modes for cooling systems for asynchronous traction motors of electric transport. An algorithm for solving the Hamilton-Jacobi-Bellman equation for the problem of the motion of an electric stock on a section of a track with a given profile and a traffic schedule is developed. That makes it possible to create an expert control system for motion. Features of this algorithm is the use of penalty functions to describe the restrictions imposed by the traffic schedule: the train reaches the destination point for a given driving time, the speed limit on the sections of the track, and the absence of train idle time during the movement. A single approach to penalty functions is also applied to introduce constraints on the adhesion. This approach allows to reduce significantly the costs of the estimated time and to simplify the procedures for calculating energy costs. A mathematical model is created to determine the efficiency of the traction drive. The model includes the determination of the main losses in an asynchronous traction motor, taking into account the saturation of the magnetic system, which is determined by the results of solving a recurrent nonlinear equation. Also, the model takes into account losses from higher harmonic stresses in copper and steel, mechanical and additional losses. The developed model takes into account static and dynamic losses in IGBT transistors and diodes of a semiconductor converter. A method for optimizing the parameters and operating modes of cooling systems for asynchronous traction motors of the electric stock is developed. It consists of the following main stages: determination of the optimum mode of the traction drive operation on the basis of the proposed expression of its efficiency; determination of optimum modes of movement of the electric stock by the criterion of minimum costs; solution of the traction problem of motion on a section of the track with a specified traffic schedule and the track profile, as well as the determination of the dependence of the change in losses in the elements of asynchronous traction engines in time; choice of parameters and operation modes of cooling systems for asynchronous traction motors, which determine the efficiency of the cooling and ventilation system of the electric stock; solution of the problem of relative minimization of the cooling system for asynchronous traction motors with a modernized criterion of economic efficiency based on the Weil method on the generalized golden section and the problem of analyzing the ventilation and cooling system of traction motors, which is based on the mathematical model of thermal motor conditions by the generalized equivalent thermal scheme.

Дисертація на здобуття наукового ступеня доктора технічних наук за спеціальністю 05.22.09 "Електротранспорт" - Національний технічний університет "Харківський політехнічний інститут" МОН України, Харків, 2018. Дисертація присвячена створенню наукових основ щодо вибору оптимальних параметрів та режимів роботи систем охолодження асинхронних тягових двигунів електротранспорту. Розроблений алгоритм рішення рівняння Гамільтона-Якобі-Беллмана для задачі руху електрорухомого складу на ділянці шляху із заданим профілем і графіком руху, що дозволяє створити експертну систему управління рухом. Особливостями цього алгоритму є застосування штрафних функцій для опису обмежень, що накладаються графіком руху: досягнення потягом кінцевого пункту за заданий час руху, обмеження швидкості на ділянках шляху, а також відсутність простоїв потягу в процесі руху. Єдиний підхід штрафних функцій застосований також для введення обмежень по зчепленню. Такий підхід дозволяє значно понизити витрати розрахункового часу і спростити процедури розрахунку витрат енергії. Створена математична модель для визначення ефективності тягового приводу. Модель включає в себе визначення основних втрат у асинхронного тягового двигуна з урахуванням насичення магнітної системи, що визначається за результатами вирішення рекурентного нелінійного рівняння. Також у моделі враховані втрати від вищих гармонік напруги в міді та сталі, а також механічні та додаткові втрати. В розробленій моделі враховуються статичні та динамічні втрати у IGBT транзисторах та діодах напівпровідникового перетворювача. Розроблено метод оптимізації параметрів та режимів роботи систем охолодження асинхронних тягових двигунів електрорухомого складу, якій складається з наступних основних етапів: визначення оптимальних режимів роботи тягового приводу на основі запропонованого виразу ефективності тягового приводу; визначення оптимальних режимів руху електрорухомого складу за критерієм мінімуму витрат; вирішення тягової задачі руху на ділянці колії с заданим графіком руху та профілем колії, а також визначенням залежності зміни втрат в елементах тягового двигуна за часом; вибору параметрів та режимів роботи систем охолодження тягових двигунів, які обумовлюють ефективність системи охолодження та вентиляції електрорухомого складу; вирішення задачі умовної мінімізації системи охолодження тягового двигуна за модернізованим критерієм економічної ефективності на основі методу Вейля за узагальненим золотим перетином та задачі аналізу системи вентиляції і охолодження тягових двигунів, яка створена на базі математичної моделі теплових режимів двигуна за узагальненою еквівалентною тепловою схемою.
Thesis for the degree of Doctor of Engineering in specialty 05.22.09 "Electric transport " - National Technical University "Kharkiv Polytechnic Institute" MES of Ukraine, Kharkov, 2018. The thesis is devoted to the creation of scientific foundations for the selection of optimal parameters and operating modes for cooling systems for asynchronous traction motors of electric transport. An algorithm for solving the Hamilton-Jacobi-Bellman equation for the problem of the motion of an electric stock on a section of a track with a given profile and a traffic schedule is developed. That makes it possible to create an expert control system for motion. Features of this algorithm is the use of penalty functions to describe the restrictions imposed by the traffic schedule: the train reaches the destination point for a given driving time, the speed limit on the sections of the track, and the absence of train idle time during the movement. A single approach to penalty functions is also applied to introduce constraints on the adhesion. This approach allows to reduce significantly the costs of the estimated time and to simplify the procedures for calculating energy costs. A mathematical model is created to determine the efficiency of the traction drive. The model includes the determination of the main losses in an asynchronous traction motor, taking into account the saturation of the magnetic system, which is determined by the results of solving a recurrent nonlinear equation. Also, the model takes into account losses from higher harmonic stresses in copper and steel, mechanical and additional losses. The developed model takes into account static and dynamic losses in IGBT transistors and diodes of a semiconductor converter. A method for optimizing the parameters and operating modes of cooling systems for asynchronous traction motors of the electric stock is developed. It consists of the following main stages: determination of the optimum mode of the traction drive operation on the basis of the proposed expression of its efficiency; determination of optimum modes of movement of the electric stock by the criterion of minimum costs; solution of the traction problem of motion on a section of the track with a specified traffic schedule and the track profile, as well as the determination of the dependence of the change in losses in the elements of asynchronous traction engines in time; choice of parameters and operation modes of cooling systems for asynchronous traction motors, which determine the efficiency of the cooling and ventilation system of the electric stock; solution of the problem of relative minimization of the cooling system for asynchronous traction motors with a modernized criterion of economic efficiency based on the Weil method on the generalized golden section and the problem of analyzing the ventilation and cooling system of traction motors, which is based on the mathematical model of thermal motor conditions by the generalized equivalent thermal scheme.

Energy demands are steadily increasing as the world's population continues to grow. Automobiles are primary transportation means in a large portion of the world. The combination of fuel consumption by automobiles along with the shrinking fossil fuel reserves makes the development of new more energy efficient technologies crucial. Electric vehicle technologies have been studied and are still being studied today as a means of improving fuel efficiency. To that end, this work studies the effect of switching frequency on the efficiency of a hybrid electric vehicle traction drive, which contains both an internal combustion engine as well as electric motor. Therefore improving the efficiency of the electric motor and its drive will help improve the viability of alternative vehicle technologies. Automobiles spend the majority of their operational time in the lower speed, lower torque region. This work focuses on efficiency improvements in that region. To estimate the efficiency trend, the system is modeled and then tested both electrically and thermally. The efficiency is shown to increase at lower switching frequencies. The experimental results show that there are some exceptions, but the basic trend is the same.
Master of Science

It is important to monitor the wheel-rail friction coefficient in railway vehicles to improve their traction and braking performance as well as to reduce the number of incidents caused by low friction. Model based fault detection and identification (FDI) methods, especially state observers have been commonly used in previous research to monitor the wheel-rail friction. However, the previous methods cannot provide an accurate value of the friction coefficient and few of them have been validated using experiments. A Kalman filter based estimator is proposed in this research project. The developed estimator uses signals from the traction motor and provides a new and more efficient approach to monitoring the condition of the wheel-rail contact condition. A 1/5 scaled test rig has been built to evaluate the developed method. This rig comprises 2 axle-hung induction motors driving both the wheelsets of the bogie through 2 pairs of spur gears. 2 DC generators are used to provide traction load to the rollers through timing pulleys. The motors are independently controlled by 2 inverters. Motor parameters such as voltage, current and speed are measured by the inverters. The speed of the wheel and roller and the output of the DC generator are measured by incremental encoders and Hall-effect current clamps. A LabVIEW code has been designed to process all the collected data and send control commands to the inverters. The communication between the PC and the inverters are realized using the Profibus (Process Field Bus) and the OPC (Object Linking and Embedding (OLE) for Process Control) protocol. 3 different estimators were first developed using computer simulations. Kalman filter and its two nonlinear developments: extended Kalman filter (EKF) and unscented Kalman filter (UKF) have been used in these 3 methods. The results show that the UKF based estimator can provide the best performance in this case. The requirement for measuring the roller speed and the traction load are also studied using the UKF. The results show that it is essential to measure the roller speed but the absence of the traction load measurement does not have significant impact on the estimation accuracy. A re-adhesion control algorithm, which reduces excessive creepage between the wheel and rail, is developed based on the UKF estimator. Accurate monitoring of the friction coefficient helps the traction motor work at its optimum point. As the largest creep force is generated, the braking and accelerating time and distance can be reduced to their minimum values. This controller can also avoid excessive creepage and hence potentially reduce the wear of the wheel and rail. The UKF based estimator development has been evaluated by experiments conducted on the roller rig. Three different friction conditions were tested: base condition without contamination, water contamination and oil contamination. The traction load was varied to cover a large range of creepage. The importance of measuring the roller speed and the traction load was also studied. The UKF based estimator was shown to provide reliable estimation in most of the tested conditions. The experiments also confirm that it is not necessary to measure the traction load and give good agreement with the simulation results. With both the simulation and experiment work, the UKF based estimator has shown its capability of monitoring the wheel-rail friction coefficient.

Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2019
Cataloged from PDF version of thesis.
Includes bibliographical references (page 39).
This thesis explores the design of a water cooled cold plate system for motor controller used in an FSAE Electric racecar. Models for pressure drop and rate of heat transfer along with the constuction of Computational Fluid Dynamics (CFD) simulations are presented to predict the pressure drop and heat transfer rate. The goal is to provide a framework to design cold plates for motor controllers, along with any other components that generate heat, such as the vehicle battery. A test bench is constructed to validate the results of the models used. Preliminary results show that while such models are useful in understanding the fundamental relationships between different variables and the properties of the flow, it is difficult to construct a model that predicts pressure losses reliably using introductory material on thermodynamics and heat transfer.
by Asli Demir.
S.B.
S.B. Massachusetts Institute of Technology, Department of Mechanical Engineering

Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2010.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 32-33).
In this thesis I worked on the design and analysis of a cooling system for the electric motor of the MIT Electric Vehicle Team's Porsche 914 Battery Electric Vehicle. The vehicle's Azure Dynamics AC24 motor tended to overheat (up to around 140C), which caused the motor controller to limit the maximum power of the motor. The maximum operating temperature of the motor is listed as 55C. The power limitation prevented the vehicle from achieving its top possible speeds, reaching only 87mph when it should get to over 100mph. To solve this problem, I designed a heat-exchanger system that runs coolant (a mix of water and ethylene glycol) through aluminum passages over the motor surface. The coolant then enters a heat-sink apparatus which consists of winding copper pipes attached to an aluminum array of fins (the heat sink) which convect away the heat into the moving ambient air. I found that with this system, at an ambient temperature of 50C, the maximum motor temperature would be about 72.61C. Even if the air temperature is 32C (89.6F), the maximum motor temperature will only be 54.7C, which is within the listed operating temperature of the motor and meets our goal. The total cost of this system is estimated to be $646.91.
by Jordan N. Meenen.
S.B.

After Michael Faraday invented the magnetism theory in 1821, the application of the permanent magnet machine was rapidly developed. The permanent magnet synchronous machine is one of the popular applications of electromagnetic theory, which is implemented in most electric vehicles nowadays. Since then, the trend of renewable electricity increased in order to reduce emission and electric vehicle popularity increased significantly. However, designing a motor that is able to rotate very fast for electric vehicle implementation is tricky. The cooling part is one of the important parts in order to achieve maximum performance of the motor.  The power produced by the motor is related to the total induced voltage of the motor, while the magnetic flux is one of the key factors in order to achieve higher induced voltage. On the other hand, the magnetic flux is inversely proportional with the temperature, the magnetic flux density decreases as the temperature increases. In order to design a motor for electrical vehicle, cooling system design is one of the important thing to consider. The motor and cooling system design was built and studied using Comsol software, with the Finite Element Method (FEM) method used to analyse the model. Two cooling systems implemented in COMSOL Multiphysics were the water cooling and air cooling system. The air cooling is represented by a fan located above the motor, the flow of the air analyzed using a turbulence flow physics. The water cooling system designed as a pipe goes around the motor as a helix, the water flow inside the pipe analyzed as a laminar flow. The simulation also involves the heat transfer physics in solid and fluid considering the convection and conduction heat transfer. The result of the simulation showed the temperature distribution in the motor after two cooling systems implemented, the water and air cooling. The cooling system helps to reduce the temperature around the magnet in order to increase the torque of the motor by providing high magnetic flux and induced voltage in the stator winding. The temperature around the magnet decreased significantly after both cooling systems were implemented, in result the performance of the motor remained high. However, the simulated model is modified from the comsol tutorial model which does not really describe a permanent magnet machine.

Diploma thesis is focused on design engine cooling system for formula vehicle type. The aim is introduce with cooling systems of Formula Student/SAE car and competition rules. Based on the famous engine determine the initial conditions for the cooling system. In addition to design all parts of the cooling system and check affordability.

Insulating sheets, impregnants and encapsulation materials commonly used for winding insulation offer low thermal conductivities. This leads to an increased heating of the winding of electrical machines and to the existence of hotspots. The electromagnetical utilization of the machine has to be reduced with respect to the allowed maximum winding temperature. In this paper, the development and experimental investigation of novel polysiloxane composites with ceramic fillers are presented. The materials are tested by means of impregnated and encapsulated samples of a round-wire winding as well as the main insulation of electrical steel sheets and laminated cores. Numerical models are implemented for determining the equivalent thermal conductivity of the winding compound comprising the enameled wire and the impregnant. Based on the example of a permanent-magnet synchronous machine with outer-rotor in modular construction, the potential for increasing the electromagnetical utilization is shown.

This thesis is focused on a novel agricultural technique for orchard cultivations that allows to perform automatic and fossil fuel free cultivation operations. More specifically, the aim of this thesis work is to study and implement the electric traction system and control the vehicle that performs the automatic operations. Starting from the analysis of each single component of the traction system, the control of the mobile platform will be then performed. After a first control of the mobile platform in no load conditions, the implementation of the dynamic model will be performed in the Simulink environment. Different simulations representing typical operational missions will be performed to have a real idea concerning the behaviour of the traction system and the energy consumption of this solution. Finally, the obtained results will be analysed for the future implementation of the mobile platform on the field.

Safety, performance and driving comforts are given high importance while developing modern day cars. All-Wheel Drive vehicles are exactly designed to fulfill such requirements. In modern times, human concern towards depleting fossil fuels and cognizance of ecological issues have led to new innovations in the field of Automotive engineering. One such outcome of the above process is the birth of electrical hybrid vehicles. The product under investigation is a combination of all wheel drive and hybrid system. A superior fuel economy can be achieved using hybrid system and optimized vehicle dynamic forces are accomplished by torque vectoring action which in turn provides All-Wheel Drive capabilities. Heat generation is inevitable whenever there is a conversion of energy from one form into another. In this master thesis investigation, a thermal simulation model for the product is built using 1D simulation tool AMESim and validation is done against the vehicle driving test data. AMESim tool was chosen for its proven track record related to vehicle thermal management. The vehicle CAN data are handled in MATLAB. In a nutshell, Simulation model accounts for heat generation sources, oil flow paths, power loss modeling and heat transfer phenomena. The final simulation model should be able to predict the transient temperature evolution in the rear drive when the speed and torque of motor is supplied as input. This simulation model can efficiently predict temperature patterns at various locations such as casing, motor inner parts as well as coolant at different places. Various driving cases were tried as input including harsh (high torque, low speed) ones. Simulation models like this helps Engineers in trying out new cooling strategies. Flow path optimization, flow rate, convection area, coolant pump controlling etc are the few variables worth mentioning in this regard.

The aim of this thesis is to design the water-cooling system for a synchronous motor with an output of 10kW. The power loss was analytically determinated. For the initial water-cooling system and for two design proposals, thermal models were calculated in Ansys. The same boundary conditions were set for all three models. Then the analysis results of the temperature distribution on the machine surface and in the slots were compared. The comparison also includes the economical cost of the production and service of the machine. Then the production documentation was created, consisting of the assembly drawings and a simplified technological process.

Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.13.05 – комп'ютерні системи та компоненти. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2019. Дисертаційна робота присвячена вирішенню науково-практичної задачі, яка полягає в розробленні та дослідженні моделей, методів та програмних компонентів бортової комп'ютерної системи керування дизель-поїзда з метою уточнення метода тягових розрахунків. В дисертації запропоновано метод і програмний компонент, який виконує ідентифікацію параметрів моделі дизель-поїзда та враховує зміну параметрів електропривода під час руху дизель-поїзда, а також здійснює підстроювання параметрів моделі електропривода в реальному часі, що дозволяє точніше розраховувати керуючі впливи для керування об'єктом. Розроблено метод і програмний компонент, який реалізує розрахунок величини струму статора кожного тягового асинхронного двигуна не по середньому, а по діючому значенню його першої гармоніки, що дозволило уточнити закон керування електропередачею. Розроблено математичну модель, яка дозволяє проводити дослідження процесів в електропередачі, які виникають при боксуванні. Запропоновано метод та програмний компонент виявлення боксування колісних пар дизель-поїзда з використанням нечіткої логіки, застосування якого дозволило виявляти синхронне та індивідуальне боксування, скоротити час виявлення боксування та підвищити тягові властивості дизель-поїзда. Розроблено програмний компонент, який реалізує алгоритм роботи рекурентної нейронної мережі, яка поряд з виявленням відхилення параметрів від оптимальних значень на кожній позиції контролера машиніста забезпечує оперативний контроль перевищення граничних значень параметрів об'єкта та визначає процеси, що пов'язані з вузлами об'єкта, які працюють у позаштатному режимі, що підвищило якість контролю та діагностики стану дизель-поїзда. Проведені експериментальні дослідження вдосконаленої комп'ютерної системи керування дизель-поїзда ДЕЛ-02 як на рівні математичного моделювання, так і на реальному об'єкті, підтвердили достовірність запропонованих рішень по уточненню метода тягових розрахунків.
There is the dissertation of the obtaining the scientific degree of the technical sciences candidate in specialty 05.13.05 – computer systems and components – National Technical University "Kharkiv Polytechnic Institute", Kharkiv, 2019. The dissertation solves the scientific and practical problem of development and researching models, methods and software components of the diesel-train onboard computer control system to clarify the traction calculations method. The dissertation proposes a method and a software component that identifies the parameters of the diesel-train model and takes into account changes in the parameters of the electric drive during the movement of the diesel-train, it also adjusts the electric drive model parameters in real time, which makes it possible to calculate the control actions parameters to control the object. A method and a software component, that implements the calculation of the stator current value of each traction asynchronous motor not by the mean, but by the effective value of its first harmonic, have been developed, it made possible to clarify the law of the electric drive control. A mathematical model, that allows to research the processes of the electric drive that occur during slipping of the wheelsets, has been developed. A method and a software component for detecting the slipping of the wheelsets of a diesel-train using fuzzy logic has been proposed, the usage of which allows to detect a synchronous and an individual wheelsets slipping, reduce the time of detection of the wheelsets slipping and improve the traction properties of the diesel-train. A software component that implements the algorithm of the recurrent neural network, which, along with identifying the deviation of parameters from the optimal values at each position of the train driver controller, provides operational control of exceeding the object’s limit values and defines the processes that are associated with the nodes of the object that operate in the abnormal mode, has been developed. That improved the quality of control and diagnostics of the diesel-train. Experimental studies of the improved computer control system of the diesel-train DEL-02, at the level of mathematical modeling and at the real facility, confirmed the validity of the proposed solutions to clarify the traction calculations method.

Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.13.05 – комп'ютерні системи та компоненти. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2019. Дисертаційна робота присвячена вирішенню науково-практичної задачі, яка полягає в розробленні та дослідженні моделей, методів та програмних компонентів бортової комп'ютерної системи керування дизель-поїзда з метою уточнення метода тягових розрахунків. В дисертації запропоновано метод і програмний компонент, який виконує ідентифікацію параметрів моделі дизель-поїзда та враховує зміну параметрів електропривода під час руху дизель-поїзда, а також здійснює підстроювання параметрів моделі електропривода в реальному часі, що дозволяє точніше розраховувати керуючі впливи для керування об'єктом. Розроблено метод і програмний компонент, який реалізує розрахунок величини струму статора кожного тягового асинхронного двигуна не по середньому, а по діючому значенню його першої гармоніки, що дозволило уточнити закон керування електропередачею. Розроблено математичну модель, яка дозволяє проводити дослідження процесів в електропередачі, які виникають при боксуванні. Запропоновано метод та програмний компонент виявлення боксування колісних пар дизель-поїзда з використанням нечіткої логіки, застосування якого дозволило виявляти синхронне та індивідуальне боксування, скоротити час виявлення боксування та підвищити тягові властивості дизель-поїзда. Розроблено програмний компонент, який реалізує алгоритм роботи рекурентної нейронної мережі, яка поряд з виявленням відхилення параметрів від оптимальних значень на кожній позиції контролера машиніста забезпечує оперативний контроль перевищення граничних значень параметрів об'єкта та визначає процеси, що пов'язані з вузлами об'єкта, які працюють у позаштатному режимі, що підвищило якість контролю та діагностики стану дизель-поїзда. Проведені експериментальні дослідження вдосконаленої комп'ютерної системи керування дизель-поїзда ДЕЛ-02 як на рівні математичного моделювання, так і на реальному об'єкті, підтвердили достовірність запропонованих рішень по уточненню метода тягових розрахунків.
There is the dissertation of the obtaining the scientific degree of the technical sciences candidate in specialty 05.13.05 – computer systems and components – National Technical University "Kharkiv Polytechnic Institute", Kharkiv, 2019. The dissertation solves the scientific and practical problem of development and researching models, methods and software components of the diesel-train onboard computer control system to clarify the traction calculations method. The dissertation proposes a method and a software component that identifies the parameters of the diesel-train model and takes into account changes in the parameters of the electric drive during the movement of the diesel-train, it also adjusts the electric drive model parameters in real time, which makes it possible to calculate the control actions parameters to control the object. A method and a software component, that implements the calculation of the stator current value of each traction asynchronous motor not by the mean, but by the effective value of its first harmonic, have been developed, it made possible to clarify the law of the electric drive control. A mathematical model, that allows to research the processes of the electric drive that occur during slipping of the wheelsets, has been developed. A method and a software component for detecting the slipping of the wheelsets of a diesel-train using fuzzy logic has been proposed, the usage of which allows to detect a synchronous and an individual wheelsets slipping, reduce the time of detection of the wheelsets slipping and improve the traction properties of the diesel-train. A software component that implements the algorithm of the recurrent neural network, which, along with identifying the deviation of parameters from the optimal values at each position of the train driver controller, provides operational control of exceeding the object’s limit values and defines the processes that are associated with the nodes of the object that operate in the abnormal mode, has been developed. That improved the quality of control and diagnostics of the diesel-train. Experimental studies of the improved computer control system of the diesel-train DEL-02, at the level of mathematical modeling and at the real facility, confirmed the validity of the proposed solutions to clarify the traction calculations method.

Este trabalho visa o estudo de uma metodologia de simulação numérica aplicada ao processo de troca térmica do motor de um veículo de passeio. O processo de troca térmica é essencial para evitar o superaquecimento do motor, que provoca o rompimento do filme de óleo lubrificante dos pistões e, conseqüentemente, o seu travamento. Essa metodologia será útil nos estudos preliminares do sistema de arrefecimento de um veículo na fase inicial de projeto por meio de simulações virtuais, o que possibilitará a redução de protótipos, além de proporcionar um ganho em tempo de resposta. A metodologia utiliza um programa comercial de CFD para a simulação do processo de troca térmica no interior do compartimento do motor do veículo. As simulações foram realizadas com base nos testes físicos em túnel de vento que fazem parte do desenvolvimento e projeto de automóveis em condições de operação que representam situações críticas integrantes da vida operacional. Essas condições operacionais de teste, tais como a velocidade do veículo, as cargas térmicas, a potência dos ventiladores e outros parâmetros foram utilizadas como condições de contorno na validação do modelo do veículo. O processo de validação de modelos é composto por: validações de itens isolados do sistema de arrefecimento, avaliação do efeito da densidade de malha computacional de um modelo completo na vazão de ar nos trocadores de calor e simplificações no modelo para a redução do tempo de processamento. Neste trabalho três modelos distintos de veículos foram utilizados, sendo que dois deles para a validação na comparação com os resultados de túnel vento, enquanto o terceiro modelo foi utilizado para a validação da metodologia através de comparações com os dados obtidos nos testes em pista circular. Os resultados das simulações mostraram variações máximas de 5,5% na temperatura do líquido de arrefecimento na entrada do radiador em relação aos testes. A metodologia de simulação mostrou ser uma poderosa ferramenta de otimização durante a fase de desenvolvimento do projeto e complementando os testes físicos para o sistema de arrefecimento veicular.
The present work is applied to a development of a numerical simulation methodology for a passenger vehicle engine cooling process. The heat exchange process is essential to avoid the engine overheat which may result in the piston oil film separation and consequently its halt. This methodology will be useful for the preliminary studies of the cooling system at the initial phase through the virtual simulations which can reduce the number of prototypes and save proposals\' time response. The methodology uses commercial CFD software for airflow simulation and the thermal process at under hood. The simulations were based on the physical wind tunnel tests that are part of the automotive development, with operational conditions representing critical situations experienced by a vehicle in its operating life. The test conditions, such as vehicle speed, thermal loads, fan power and other parameters were used as the boundary conditions for the model validation. The validation process is based on the following phases: validation of the isolated cooling system components, the effect of mesh density at cooling airflow using a complete vehicle model and model simplification in order to improve the processing time. In this work development, three different models were used; two of them for validation with test tunnel data and the third, was used for methodology validation through the circular road test. The simulation results for tunnel and circular road showed 5.5% of differences for the radiator coolant inlet temperature when compared with physical tests. The methodology of the simulation is a powerful tool for optimization during the development phase and complementing the physical tests for the vehicle cooling systems.

碩士
國立高雄第一科技大學
系統資訊與控制研究所
98
This main research and explain 700T trainset of thesis draws the system of propulsion and traction, Converter and Inverter operation are used to reach the train traction and brake ability. In the traction mode, Converter/Inverter equipment will be according to pulse width modulation(PWM) signal from the master controller and adjusting/change the output power. In the brake mode, Converter/Inverter equipment will be received from the signals of Brake Electronic Control Unit(BECU) operation. When the trainset perform regenerative brake, the power of Converter/ Inverter equipment will return to OCS system via main transformer of trainset. While Converter/Inverter equipment operating, its relevant to control component and device can transpire hot, must make these hot to take the device out of via heat radiator system. Moreover, in this thesis, three factors including load value of the equipment operation mileage, inlet-filter type of the radiator, and limited set current value will be selected to evaluate the optimal design so as to provide a preferred inlet temperature of the radiator system by using Taguchi method and dual response surface method respectively.

碩士
國立高雄海洋科技大學
輪機工程研究所
103
In this study, use the experiment to explore the impact of jet cooling provided to the possibility of rotating machinery more efficient cooling mechanism. The Experiments are under normal environmental conditions using the conventional cooling DC motor at a fixed load conditions. The purpose of the experiment is to check the cooling ability of a motor by compare the temperature of the surface when we use effusion cooling in steadily rotational speed on 3000rpm, 3500rpm, 4000rpm, 4500rpm. In another experiment we do the experiment in the simulation of higher temperature and terrible cooling condition in steadily rotational speed. This study does not change at the motor part of its original structure, between the cooling fan and the cooling channel to install only the number of separator different holes for the cooling fluid of the pressure after the accumulation, and then eject hole to form booster The jet flow field for the rotor and stator cooling passage related components, and use the case of a thermocouple to measure the surface temperature of the motor. The results appear in a multi-row spray cooling condition of the porous number, the motor speed in four different operating conditions, the appearance of the temperature drops, evident in this way that there actually better cooling of the utility.

碩士
國立聯合大學
機械工程學系碩士班
106
There’s an increasing demand for linear platform in industry, while the system response speed and positioning accuracy requirements are also rising. The ironless linear motor has the characteristics of direct drive, so the response speed is fast. Because it does not have a cogging structure, so it has small speed ripple, and high positioning accuracy. However, due to continuous improvement of industrial technology, in addition to the requirements of the platform system more stringent, but also take into account the equipment usage and cost. So to enhance the motor thrust density is the key issue in motor design. This paper proposes an ironless linear motor with a forced air cooling at a safe operating temperature, and considers the coil winding density and the cooling efficiency of the air cooling system. Through this design method, the motor has the characteristics of high response, high precision and high thrust density. In addition to propose a design process in this paper, the electromagnetic field analysis (Ansys Maxwell), structural field analysis (Ansys Mechanical), and heat flow analysis (Fluent) are used to design an ironless linear motor with forced Air-cooling system and complete its prototype. Finally, the feasibility of the design is verified by experiment and simulation. Keywords: Ironless linear motor, thrust density, cooling system

碩士
國立臺北科技大學
電機工程系研究所
97
The objective of this thesis is to design and implement Brushless DC Motor (BLDCM) drives for automotive Heating Ventilation and Air Conditioning (HVAC) system which is used for fan driving application of condenser in heavy duty trucks with No-Idle Thermal Environment (NITE) system. The BLDCM drives are with Hall position sensors and 180° six-step commutation method. The efficiency is up to 80%. The fan is driven by BLDCM drive via PWM control signal based on the requirement of HVAC cooling system. The designed BLDCM drives for HVAC system should meet the requirement of vehicle electrical characteristics. The implemented BLDCM drives consist of active breaker for battery reverse polarity protection and quiescent current to reduce the power consumption when the BLDCM of vehicle is in idle mode. This BLDCM drive is integrated with active transient voltage protection which can avoid surge voltage and load dump. The experimental results confirm that design and implementation of BLDCM drive meet the requirement of automotive HVAC cooling system.

碩士
國立虎尾科技大學
機械與機電工程研究所
97
In this paper, the permanent magnet synchronous motor using fuzzy control technique in engine cooling system was studied. The engine cooling systems in a variety of types of vehicles use belt-driven fan mostly. Only cars and light goods vehicles use electric fan motors, but they are brush DC motors and use switch-mode control law; however, the fan output of two alternatives can not be adjusted with the cooling system at any time. The problem of excessively high current is also often one of the reasons that fans damage. Thus it increases the engine load, fuel consumption and the wear and tear of fan motor. Therefore, this paper replaces the traditional brush DC motors with permanent magnet synchronous motor for the engine cooling fan motors, and the water tank with water temperature is operated with intelligent fuzzy control theory. The program is inputted into C8051F330 by Silicon Laboritories companies Microcontroller MCU Development Tools. The output of the hardware builds simulation models. The simulation results showed that the application of engine cooling system using fuzzy theory maintained the stability to keep the best rotation rate of the engine. The use of permanent magnet synchronous motor with the water temperature fuzzy logic responses fast. It keeps the best temperature of the engine as well as decreases unnecessary operation of fan, reduces the wear and tear on the fan motor and improve life of cooling fan. This study can enhance performance and reduce fuel consumption in practice. Key Word：Permanent magnet;Brushless;Fuzzy

The performance of a combined vapor-compression cycle/ORC is evaluated using waste-heat from a diesel generator. A flat plate microchannel heat exchanger is employed to provide energy exchange between the diesel exhaust stream and an oil loop, which provides energy to a boiler. This study finds an increased diesel duty corresponds with an increased cooling capacity, for a maximum of 5 kW of cooling (with 13.5 kWe diesel load). System COP is reduced with a higher input power due to limitations in the cooling cycle. A number of solutions are identified to increase the COP and cooling capacity. A new microchannel heat exchanger to recovery heat is designed to increase performance compared to the previous version.
Graduation date: 2012