1.1 Introduction Global warming by carbon dioxide and air pollution is getting serious these days, as a result that led to increased attention for the idea of Electric Vehicle (EV). The idea of an EV has been around for almost 200 years. Thomas Davenport built the first EV in 1834. Until a few decades ago, batteries seemed to be the only device capable of storing the energy in a safe manner. Unfortunately, batteries are still not able to store the amount of energy needed to fulfill the needs of an electric vehicle completely. They also have a low energy to weight ratio and problems with the recharging of the battery are not completely solved [1]. Recent developments in microprocessors, magnetic materials and semiconductors technologies have offered an excellent opportunity to use ac motor in high performance …show more content…
Some of these are summarized as follows [12]: • The only parameter that is required is stator resistance; • The switching commands of the inverter are derived from a look-up table; • Simple hysteresis controllers are used for torque and stator flux linkage control; • Vector transformation is not applied because stator quantities are enough to calculate the torque and stator flux linkage as feedback quantities to be compared with the reference values. Although there are several advantages of the DTC scheme over vector control, still has a few drawbacks or problems, DTC disadvantage can be explained as following [11]: • Variable switching frequency; • High sampling time is required; • Inverter switching frequency depending on: flux and torque hysteresis bands, machine parameters, sampling frequency; • Current and torque distortion caused by sector changes; • Start and low speed operation problems; • High noisy level; • High current and torque
“We can break our dependence on oil…and become the first country to have one million electric vehicles on the road by 2015,” President Obama said in his January 2011 State of the Union address (Institute for Energy Research 1). While this may sound promising, the practicality and merit in achieving this goal remains unclear. Auto manufacturers have been working on plans for electric cars for years, especially the three largest companies in the US: Chevrolet, Chrysler, and Ford. These companies have been hoping that the development of electric cars would create a sort of lifestyle change for consumers, both weaning the U.S. off of its dependence on foreign oil and breathing life into the market for auto sales at the same time. Electric cars are often sold as zero emissions, but technically that is only true once they are charged and in terms of their tailpipe emissions. After all, they have to get their energy from somewhere and, more often than not, the electricity used for charging is supplied by traditional coal fired power plants. The real question then is whether the source and amount of energy required to build and supply an electric car with power is actually cleaner and more economical than a traditional combustion automobile. As it turns out, the answer is both unexpected and fairly complicated. In order to assess whether the use of
Slide 3: if you reduce inverter losses, then what is the point of checking Tj>Tcrit for imposing I constraint? At very high current, would you get any tangible benefit by reducing switching frequency?
Abstract—In this modern era, many advancements in technology have been witnessed. Research and data collected around the world have allowed for these advancements to take place. This has allowed for a better understanding of the footprint humans leave on the environment. As a result, this has allowed for the planet to become eco-friendlier. An eco-friendly advancement in the 21st century is the electric vehicle. There are a plethora of benefits using electric vehicles. Some advantages include no emissions, cost-effective, and low maintenance.
In real applications, the values of the controller parameters will be usually computed for one case (generally, the typical demand) and applied for different scenarios. Therefore, it is important that the controllers adjusted for one scenario, also perform properly in other circumstances. In other words, it is necessary to have a robust controller, especially against different demand profiles.
Feed-forward control is considered when there is a need to reduce the effects of disturbances on a system. A detector will sense a disturbance or a load change within the system and the controller outputs the required signal to offset this. This will in theory allow the controller to counteract the disturbance before it influences the process. This type of control requires the engineer to have excellent knowledge of the system before implementing it.
Electrical vehicles technology has been present for a while and is a proven technology that need only reshaping to meet the global need. Though, in the past, the technology had failed to compete with the internal combustion engine due to initial cost, the technology has done well in the past few years. Electric vehicle ability to reduce the emission of greenhouse gases like carbon and carbon dioxide and the advantages it enjoys such as low maintenance and running cost can enhance it market competitiveness. However, as experts try to make its charging system more efficient and its ability to store charge more long lasting, the global need continue to rise. The research proposal, therefore, aim at addressing an issue like government involvement can enhance improved use of EV, development of better EV batteries, energy management system and fast charging can help enhance the use of Electrical Vehicles and how electric vehicle drive train and the battery can be redesigned to make it affordable.
Electric cars are becoming very popular in today’s world and are becoming more main stream. One reason for this is the need for automobiles that have a lower or a zero carbon footprint. For the majority of the history of the automobile, the propulsion system was a gas or a diesel engine that would run off of fossil fuels. The burning of fossil fuels is very hazardous to our world and also creates much toxic pollution. However, electric cars run off of electricity, which is a very clean and pollution free resource, depending on how the electricity was produced of course. In this paper we are going to examine the history of electric cars, look into modern electric car technology, and peer into the future of electric car technology to see if EVs might be the answer to dramatically reducing our global pollution.
Technology has been advancing since the turn of the century at an unparalleled pace with the constant announcement of new gadgets and innovations. Of the thousands of new technological advancements made in the past decade, the introduction of the electric car has been the most widely discussed topic. Electric cars are one hundred percent emission free and can replace the fire spitting, bone chilling sounds of a thunderous gasoline engine with the eloquent silence of luxury and speed. However, as with all things technological, electric vehicles have their problems. Electric cars have several benefits and could possibly replace gas cars in the future, but they are not refined enough to take over the world today because of a few technicalities
We need to integrate smart technology to regulate the power and eliminate was. This combined will conservation efforts will free up the energy needed for electrical vehicles. (Weeks. 145-168) A person with this same idea is R. Frank, writer of, Electric Vehicles: The Smart Grid’s Moving Target. He focuses on the ability and consumer feasibility of the electric vehicle and the impact on the power grid, and suggests that many advancements need to be made to our infrastructure before a large percent of our vehicles could transition to electric power. ( Frank. 65-70). A study was conducted ornl.gov to see the impact electric vehicles would have on the nation’s power grid. Projections are for at lease a twenty-five percent penetration of hybrid vehicles in the market by two-thousand and twenty, with high percentage of those being plug-in variety. The study shows that if consumer’s charge their vehicles at five PM when they get home from work, the country would need an additional one-hundred and sixty power plants, compared to no additional plants needed if everyone charged after ten PM. Systems will have to be mandated to ensure charging only occurs in the overnight hours when demand is at its lowest. If this can not happen then a suggestion “Power grids need to be upgraded to be more efficient and utilize off-peak times for charging of electric vehicles” said by David Sandalow
There is a serious problem facing the world right now. It is air pollution. The number one contributor to this epidemic is automobile emissions. We have all heard of the issues that are involved with air pollution including the depletion of the o-zone layer, the green house effect, and acid rain. The problem has been scoped from every imaginable angle, and now it is time to solve the problem. I propose that each of the ‘Big Three’ (Ford, General Motors, and Chrysler) car manufacturers be required to have 10% of their product line as EV’s By the year 2010. I propose this because it will be the start of cleaner air, EV advancement, and awareness of EV’s and how they work.
Cars are used by many people all over the world to get them from place to place. Most of these cars are powered by gasoline, some are powered by diesel, and some newly cars are powered electrically. Many people believe that electric cars can be the future of the car industry, but will most other car companies hurt from this? Electric cars use an electric motor to power the car instead of an engine, the owner of an electric car recharges the battery inside the car to power the motor. According to Tesla Motors, an electric car company, “Tesla possesses a high powered wall connector, which completely recharges the car in under 4 hours, and at max power, the high powered wall connector charges at a speed of 56 miles range per hour”(Tesla Motors “Tesla Vehicles Provide Attractive Environmental Benefits” 6). While electric cars do not have as much range as gas-powered cars, no emissions are made from the electric battery, which in result ends up benefiting to the environment.
The principle of electric vehicles is to allow consumers to completely avoid the direct use of fossil fuels in order to preserve the environment. Electric vehicles are enlarged toy cars. There are three main components of the car. Similar to a radio-controlled car, EVs require an electric motor, a controller, and a battery (What). In comparison to the internal combustion engine, these parts allow the car to remain free of fossil fuels. The operation of the car follows a similar principle compared to the conventional car. First, there is an energy source, such as an electric battery or gasoline. Next, the components cooperate to convert potential energy into mechanical energy. Although the concepts are similar, the procedure remains different between the two vehicles. An electric car relies on controllers to operate.
Energy is the lifeblood of modern society, but the major energy supplies are fossil-fuel generation, which leads to air-pollution and environmental issues. Then, there is an increasing need to develop renewable energy to balance the demand and supply. Electric vehicles and hybrid electric vehicles will be the effective method to decrease fossil-fuel usage and rechargeable batteries are one of the main strategies to power these vehicles. [tarascon]
Upon the first discovery of electricity, the subjects of electricity and magnetism would go on to revolutionize life as we know it. With the rudimentary work completed by the leaders within the field, such as Benjamin Franklin or Nikola Tesla, these brilliant scientists laid the foundation that would go on to become arguably one of the most important aspects of our forever-changed society. Although we have learned to incorporate electricity, it has many uses within our lives. Electric energy is at the forefront of our world’s business, engineering, and medical sectors of the workforce. Public transportation is rapidly getting on the radar for developing new technologies to better serve consumers. With great emphasis being placed on living more eco-friendly lives and the increasing costs of energy, these more efficient transportation models will change the face of history. One major point driving this initiative is the pull back of fossil fuel consumption, and the reduction of greenhouse gases being released into our atmosphere. Both historians and energy experts agree that as society advances, there is a need for more concentrated, powerful forms of energy, like rocket fuel instead of gasoline. Electric vehicles are one of these technologies to hit the consumer markets. Companies such as Toyota and Tesla are beginning to manufacture both hybrid and electric vehicles. Electric cars work on the basis of expending the energy stored in a battery (or series of batteries) for
Ever since mankind was born, the most common activity that any human would perform everyday; is travelling. Whether it was travelling a very short distance ranging from 1 meter to miles and miles, mankind would travel in order to acquire the elements needed for survival. For short travelling distances mankind would walk; in the earlier days human beings walked longer distances. For longer distances humans would ride on the back of animals to get them to their destination. Now a days, human beings walk shorter distances in average. And instead of the difficult rides on the back of an animal, they ride inside a cool machine that would withstand almost any weather condition to get them to even farther destinations. The machine is