Electric Drive System Design, Simulation and Construction

Electric Drive System Design, Simulation and Construction Abstract In this experiment, three phase flexible inverter was used to drive a Brush Less Direct Current (BLDC) machine. Three experiments steps use three-phase inverter which is connected to resistor and inductor load and BLDC machine to examine and measure 1) Pulse Mode Modulation (PMW); 2) Three wave signal sinusoidal and 3) BLDC signal sequence. Computer simulation using MATLAB Simulink is used to analyze the laboratory result and software calculation. The speed and torque of BLDC machine can be controlled by controller using PWM technique. This BLDC machine can be modelled as Resistor and Inductor Load.   1.1 Background Many electrical load (e.g. electric motor, lighting) need a wide of range voltage, current, frequency and phase angle which is converted from electrical source (e.g. electric grid, battery) with constant voltage, frequencies, current and phase angles. This conversion mechanism use power electronics converter and one application of converter is inverter which convert DC input into AC output [1]. In this experiment, this inverter will provide a variety of voltage and frequency to drive BLDC machine in order to operate at a specific speed and torque. 1.2 Module Aims The aim of this experiment is to understand design, construction, simulation, and testing of an electrical drive system through practical experience. The procedure of this project can be divide into following steps. Research electrical drive technology. Construction of an electric drive. Simulate and understand an electric drive system. Experimental test, analysis and verification of the system Diagrammatic interpretation of software operation Production of a written technical report. 2.1 Pulse Width Modulation In this experiment, the circuit use 3 pairs of MOSFETs as shown in figure 2.1. Having set the PIC software to the PWM test mode for the controller, measurements was taken on terminal point in three pairs (J1-J2, J3-J4 and J5-J6) which indicate gate-on voltage. Figure 2.1. 3-phase MOSFET arrangement diagram. The gate-on voltage on terminal J1-J2 over time can be shown in figure xx, it consists of time-on (T-on) and time-off (T-off). Time switching period can be calculated as T=t-on+t-off and duty cycle as ratio of time-on (T-on) over time switching period. The 3 pairs of MOSFET have relatively the same switching frequency and gate-on voltage, but in the different percentage of duty cycle, as complete result shown in table xxx. From figure xx, dead time is calculated as time span from J1 when voltage start to off and J2 when voltage start to on. PMW switching frequency = Duty cycle = Figure 2.2. PWM signal for J1 (Yellow) and J2 (Green): time-on, time-off and voltage on. Figure 2.3.   PWM signal: dead time between J1 (Yellow) and J2 (Green). Table 2.1. PWM Signal (J1 to J6) 2.2 Three Phase Sine Wave Generator In this experiment, the controller is programmed with test 2 test to convert from DC supply to 3-phase AC output. The output of inverter connected to electrical load (resistor and inductor) and then voltage is measured between resistor R1. The frequency of AC output can be altered by the R22 potentiometer. By varying the setting of potentiometer, the result between resistor R1 (V1-V2) can be shown in figure 2.1 for minimum, figure 2.2 for middle, and figure 2.3 for maximum setting of potentiometer. Figure 2.4. Inverter frequency (f=1.97Hz) in the minimum setting of potentiometer Figure 2.5.   Inverter frequency (f=16.18Hz) in the middle setting of potentiometer Figure 2.6. Inverter frequency (f=19.82Hz) in the maximum setting of potentiometer Figure 2.7. PWM signal (f=10.16kHz) while at the duty cycle 23%. 2.3    BLDC Motor Control In the test-3, the controller is programmed with test 3 test to convert from DC supply to operate and control a three phase BLDC machine. BLDC machine is equipped with three Hall Effect sensors, their function is to sense the rotor position to the controller in order to make MOSFETs can make certain switching arrangement to produce a particular speed for BLDC motor. After inverter connected to hall effect sensor and to power supply of BLDC motor, the results can be shown for the sequence position between H1-H2 (figure xx), between H1-H3 (figure xx) and also the total sequence position between H1-H2-H3 in figure xx. The supply voltage for BLDC, phase A voltage is can be shown in figure xx and figure, which magnitude at around 25 V but the duty cycle fluctuate between range 37% up to 62%. Figure 2.8. H1 (Yellow) and H2 (Green) sequence at almost similar frequency (f1=132Hz and f2=131Hz) Figure 2.9.   H1 (Yellow) and H3 (Green) sequence at almost similar frequency (f1=132Hz and f3=130Hz) Figure 2.10. Relation between H1 (state 1) and voltage phase A (duty 37%). Figure 2.11. Relation between H1 (state 0) and voltage phase A (duty 62%). Figure 2.12. H1-H2-H3 command sequence. 2.4    Variable DC Supply Simulation In this Matlab simulation, DC supply was connected to resistive-inductive load with the value of R=47Ohm and L=33mH. DC output was produced by compare the triangle waveform and a reference setting point. The triangle waveform magnitude has minimum value -1 and maximum value +1 with a frequency 20kHz. The reference setting point was set at 0, 0.5 and 1 which represent duty cycle (D=0%, D=50% and D=100%). The shape of current waveform with duty cycle can be shown in figure xx. There are several screens captures with a variation of 1) the reference setting point (figure xx), 2) the triangle switching frequency and 3) the value of inductance. Figure 2.13. The output current with duty cycle D=50% and swithing frequency fs=20kHz Figure 2.14. The output current with different inductance duty cycle (D=0%, D=50%, and D=100%) Figure 2.15. The output current with different switching frequency (fs=10kHz, fs=20kHz, and fs=40kHz) Figure 2.16. The output current with different inductance value (L=1.65mH, L=3.3mH, and L=33mH) 2.5    Variable AC Supply Simulation In this AC supply, AC supply was also connected to resistive-inductive load with the value of R=47Ohm and L=33mH. AC output was produced by compare the triangle waveform and a sinusoidal control signal. The triangle waveform magnitude has minimum value -1 and maximum value +1 with a frequency 10kHz. The reference was a sine wave with frequency 50 Hz and magnitude varying from maximum +1 and minimum -1. The shape of current waveform with duty cycle can be shown in figure xx. There are several screens captures with a variation of 1) the sine wave reference signal (figure xx), 2) the triangle switching frequency and 3) the value of inductance. Figure 2.17. The output current with a sine wave reference setting fc=50Hz and a switching frequency fs=10kHz Figure 2.18.   The output current with different sine wave reference setting (fc=25Hz, fc=50Hz, and fc=100Hz) Figure 2.19. The output current with different switching frequency (fs=10kHz, fs=20kHz, and fs=40kHz) Figure 2.20. The output current with different inductance value (L=1.65mH, L=3.3mH, and L=33mH) 3.1 Pulse Width Modulation (PWM) This MS Word template (.dot file) was prepared by Dr. Jonathan I. Maletic in the Department of Computer Science at Kent State University.   This is Version 1.0.   It is a template for Thesis/Dissertations for the College of Arts and Science at KSU. 3.2 Three Phase Sine Wave Generator In this Matlab simulation, DC supply was connected to resistive-inductive load with the value of R=47Ohm and L=33mH. DC output was produced by compare the triangle waveform and a reference setting point. The triangle waveform magnitude has minimum value -1 and maximum value +1 with a frequency 20kHz. The reference setting point was set at 0, 0.5 and 1 which represent duty cycle (D=0%, D=50% and D=100%). The shape of current waveform with duty cycle can be shown in figure xx. There are several screens captures with a variation of 1) the reference setting point (figure xx), 2) the triangle switching frequency and 3) the value of inductance. 3.3 BLDC Motor Control In this AC supply, AC supply was also connected to resistive-inductive load with the value of R=47Ohm and L=33mH. AC output was produced by compare the triangle waveform and a sinusoidal control signal. The triangle waveform magnitude has minimum value -1 and maximum value +1 with a frequency 10kHz. The reference was a sine wave with frequency 50 Hz and magnitude varying from maximum +1 and minimum -1. The shape of current waveform with duty cycle can be shown in figure xx. There are several screens captures with a variation of 1) the sine wave reference signal (figure xx), 2) the triangle switching frequency and 3) the value of inductance. 3.4 Variable DC Supply Simulation In this AC supply, AC supply was also connected to resistive-inductive load with the value of R=47Ohm and L=33mH. AC output was produced by compare the triangle waveform and a sinusoidal control signal. The triangle waveform magnitude has minimum value -1 and maximum value +1 with a frequency 10kHz. The reference was a sine wave with frequency 50 Hz and magnitude varying from maximum +1 and minimum -1. The shape of current waveform with duty cycle can be shown in figure xx. There are several screens captures with a variation of 1) the sine wave reference signal (figure xx), 2) the triangle switching frequency and 3) the value of inductance. 3.5 Variable AC Supply Simulation In this AC supply, AC supply was also connected to resistive-inductive load with the value of R=47Ohm and L=33mH. AC output was produced by compare the triangle waveform and a sinusoidal control signal. The triangle waveform magnitude has minimum value -1 and maximum value +1 with a frequency 10kHz. The reference was a sine wave with frequency 50 Hz and magnitude varying from maximum +1 and minimum -1. The shape of current waveform with duty cycle can be shown in figure xx. There are several screens captures with a variation of 1) the sine wave reference signal (figure xx), 2) the triangle switching frequency and 3) the value of inductance.

Flowchart for a Process Essay

The Pre-Admissions Testing (PAT) department at Good Samaritan Medical Center conducts pre-operative testing on almost every patient scheduled for surgery. The pre-surgical process from start to finish is more time-consuming than it has to be. This paper will identify a specific process, and design a flowchart that gives a visual of the pre-surgical process. The flowchart will show the various factors that affect the design process, and highlight the specific process. By designing a flowchart for the process, the intent is to identify the amount of time, redundancy of calls made to the patient, and initiate ideas to make the process more efficient. Factors Affecting Process Design Factors that affect the process design are 1. Is the patient scheduled as soon as the reservation is received? 2. Is the pre-admissions department notified in a timely manner for next day add- ons? 3. Is the patients contact information correct? Each factor mentioned has a huge impact on the outcome of the pre-admission process. Additional factors that affect the process design are 1. Incorrect spelling of names 2. Incorrect booking status 3. Surgery cancellations and updating surgical schedule in a timely manner Indentified Metric The metrics identified to measure the process is time, efficiency, and productivity. The following data gives a brief description of the daily activities, and the flowchart gives a description of the PAT process. Week# 1 Tuesday – 01/28/13- Scheduled several appointments; two patients showed up for appointments that were not on the schedule and had to be rescheduled due to the schedule being full. Several patients were called two or three times due to lack of communication. Called doctor offices to get correct patient phone numbers. Wednesday- 01/29/13- Had to made several doctor offices to get correct patient phone numbers. Patient was added to the schedule and PAT was not notified. Patients were rushed to come in because he was asked to come in at the last minute. Thursday-01/30/13- Had to call doctors’ offices to get correct phone numbers. Patients arrived that were not on the scheduled and the wait time was over one hour. Patients contacted after their surgery was cancelled because PAT was not notified that the surgery was cancelled. Friday- 01/31/13- Several doctors’ offices had to be contacted to get correct phone numbers. Contacted patients that were added on the schedule. Conversed with scheduling, regarding errors and incorrect information on surgery schedule also mentioned incorrect phone numbers. I work a ten-hour workday and as shown, a large amount of time goes into getting correct phone numbers, rescheduling patients, and re-calling patients that have already been contacted. Due to the inefficiency in the PAT department, the number of patients that are seen on a daily basis are limited. With several minor changes the PAT department could run more efficiently and the employees will have less stress. Pre-Admissions Testing Process Flowchart Missing References – .2 Point When writing academic papers a minimum of one reference should be provided which would be your course text. This demonstrates that you read the course text and can apply it to the topic of the paper. No references indicate a paper that reflects personal opinion only and does not demonstrate application of course concepts covered in the reading material for the week. Week 1 Grading Design a Flowchart for a Process Assignment Content and Development 6 Points| Points Earned6/6| Select a process you perform daily but would like to spend less time doing, such as driving to work. Design a flowchart using an appropriate tool.Comment on the factors that affect the process design. Identify at least one metric to measure the process.Submit your flowchart for the process.| Inez,You have provided: 1. An explanation about the process chosen to improve 2. A flowchart of the process which uses the flow chart symbols appropriately as described in Week 1 readings 3. A discussion about the factors that affect the process design 4. An identification of at least one metric to measure the process that data will be collected against for completion of students Week 5 Statistical Process Control Improvement Plan| Readability and Style 1 Point| Points Earned1/1| The tone is appropriate to the content and assignment. Sentences are complete, clear, and concise.| * Central theme/purpose is immediately clear * Structure is clear, logical, and easy to follow| Mechanics 1 Points| Points Earned.8/1| The paper is laid out with effective use of headings, font styles, and white space.Rules of grammar, usage, and punctuation are followed.Spelling is correct.| * Rules of grammar, usage, punctuation are followed * Spelling is correct * APA issue as noted in your assignment – .2 Point| Total 8 Points| Points Earned7.8/8| Chapter 5 Page 154 What Is A Process? A process is any part of an organization that takes inputs and transforms them into outputs that are of greater value to the organization than the original inputs. Page 157 How Is A Process Represented? Often the activities associated with a process affect one another so that it is important to consider the simultaneous performance of a number of activities, all operating at the same time. A good way to start analyzing a process is with a diagram showing the basic elements of a process, typically tasks, flows, and storage areas. Tasks are shown as rectangles, flows as arrows, and the storage of goods or other items as inverted triangles. Sometimes flows through a process can be diverted in multiple directions depending on some condition. Decision points are depicted as a diamond with the different flows running from the points on the diamond. Process Flowchart Example Page 162 How Is The Performance Of A Process Measured?

Remembering Someone Who Passed Essay Samples Reviews & Tips

Remembering Someone Who Passed Essay Samples Reviews & Tips Want to Know More About Remembering Someone Who Passed Essay Samples? There are a few ways that someone can make their memory more efficient. This sort of memory or learning doesn't require the information to be linked with different things which they can associate. Non-declarative memory is also called implicit memory. There are happy memories of those that are gone, though we're sad also. Memory even affects human motor abilities and the capability to communicate. Long-term memory even affects human motor abilities and the capacity to communicate. Short-term memory is temporary by an issue of minutes. The intermediate memory isn't often mentioned among the forms of memory. I remember lots of things from my childhood. Somehow, it is sti influence my life, even when you aren't here. Keep their personalities and temperament in mind, and try to remember you don't need to ramble on. What Everybody Dislikes About Remembering Someone Who Passed Essay Samples and Why Some researchers think that memory in infants and kids start off very basic and easy. If you'd like to include your loved ones who have passed away in your huge day but would love to keep it subtle, then it's recommended to mention them in your wedding program or inside a speech. In the end, the reason for death is the work of the immediate family, and nobody else's. Now's the time to generate justice a reality for each of God's children. 1 person's anthem is another individual's elevator music, yet this calendar year, 1 song came out that had everyone in the nation wiping their eyes at the very same moment. Sometimes we started out by referring to life at her childhood house in Arizona, and she'd wind up telling me what sort of man I ought to marry. It's the extreme longing for an absent something or somebody you love. A man isn't a financial plan. Most often whenever your mind is occupied with a great deal of things, falling asleep can be quite hard. Please don't be afraid to call if you require anything. In the event that you were planning to do it halfassed you might as well not do it in any respect. Sometimes you simply don't understand once you're able to fall asleep when you're contemplating someone. Obviously, such procedure can be applicable to anybody. Information is just stored here for under a couple of seconds. It is constantly being added to the memory, whether or not a person remembers to remember. Such information might vary based on the writer's discretion. This is sometimes a fantastic homeschool writing activity! The brain will store the information that's pertinent for use later on. And naturally, don't neglect to say `Bingo!' Key Pieces of Remembering Someone Who Passed Essay Samples An excellent eulogy does not have to be uniformly sombre, just appropriate. The typical eulogy is all about 3-5 minutes long. Entering your eulogy isn't hard to do. Writing a superb eulogy can be tough, particularly when it's the very last thing you ever thought you'd have to prepare for somebody you care for so dearly. So the very first rule about sympathy notes is to at all times write one. The entire idea behind this gesture is to produce a presence inside the room during the ceremony. No matter your thoughts, you ought not feel pressured into giving a eulogy or guilty if you are feeling unable to achieve that. Though it is cliche, I know you're in a better place. The Fundamentals of Remembering Someone Who Passed Essay Samples Revealed It's not lost on his family he died the very day he would have been required to spring his clock forward. A lengthy list of honors and accomplishments isn't often of interest to anybody beyond the immediate family. It's often worth checking with the remainder of the family prior to deciding on how you remember a loved one on your special moment. Some upcoming days will be tougher than others. Whenever you own a match, just put this modest red chip in addition to it. Whether you are considering having a whole table full of memorabilia of those people who have passed away. At times, it's much more difficult to fall asleep at night when you're missing someone. Just continue putting one foot in the front of the other.

Should College Athletes Be Paid Essays - 1105 Words

The NCAA makes more than a billion dollars during March Madness each year due to all the sponsors and other advertising. College Athletes need to be paid because an average they practice up to five days a week during the season and also have lots of training in the offseason. Plus they have to attend school every day which gives college athletes no time to actually have a full functioning job to be able to buy groceries and other expenses. The athletes only have their scholarship to use for other payments if they have one and maybe there parents aren’t able to pay for their apartments and other expenses. So they could use some extra money on the side. During the month of March the college basketball teams play throughout the month for†¦show more content†¦Ã¢â‚¬Å"â€Å"Football and men’s basketball players at top sports schools are being denied at least $6.2 billion between 2011 and 2015 under National Collegiate Athletic Association rules that prohibit the m from being paid,† according to a study by the National College Players Association and the Drexel University Sport Management Department.† (Hayes) The most valuable college basketball team last year was the Louisville Cardinals and a study shows that each player from the team was denied up to $6.5 million each in uncompensated labor. The basketball program there brought in about 42.4 million in revenue in the 2011- 2012 academic year, according to the Department of Education. That money could very easily be split up between each other players on the team and there would be a lot left over to pay the couches salaries and other stuff that they need to buy. If Louisville was able to bring that much money throughout the basketball season then other would definitely have enough money as well to pay off each of their student athletes per year. Also more people can fit into the football stadiums so if there were able to fit up to 100,000 people in a stadium and make the starting price of eachShow MoreRelatedShould College Athletes Be Paid?1578 Words   |  7 PagesAshay Mehta Nou Per 8 Should College Athletes Be Paid? One of the hottest debates in the sports industry is if college athletes should be paid. If you want to pay these athletes, how would the college determine the dollar amount that should be paid? Should the basketball team make more than the football team? Should the the soccer team be paid as well? Cheerleading? Chess team? Should everyone on the team get a salary? What if your college is good at football and your basketball team is awfulRead MoreShould College Athletes Be Paid?1398 Words   |  6 Pagesbelieve that college athletes at the highest performing schools are better treated than others. Although they do not get paid, they do receive some benefits for being athletes that other students would not get. One advantage for playing a sport is access to scholarships that some schools reserve for their athletes. Depending on the school and the athlete’s performance, money towards tuition is often given. Only some schools are willing to grant â€Å"full-ride† scholar ships for certain athletes. AccordingRead MoreShould College Athletes Be Paid?1289 Words   |  6 PagesThroughout the years college sports have been about the love of the game, filled with adrenaline moments. However, the following question still remains: Should college athletes get paid to play sports in college? 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While most players who play in college sports are under a scholarship, that pays for the college tuition, books, and housingRead MoreShould College Athletes Be Paid?1364 Words   |  6 PagesHave you paid attention to all of the news that has been surfacing about collegiate sports lately? It is a big topic now days in the world of sports on weather college athletes should be getting paid to play sports. College athletics have gained great popularity of the past few decades, and have brought schools lots of revenue. A lot of college athletes think they should be getting paid for their services they do for their school. College sports like basketball and football generate over six billionRead MoreShould College Athletes Be Paid?1130 Words   |  5 PagesWhat college athlete would not want to be paid to play the sport that he or she loves? The real question is, though, should college athletes be paid fo r their roles in a college’s athletics? 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