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Advantages And Disadvantage Of Electric Vehicle

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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

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