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Electric vehicles

A brief Intro about Electric Vehicles.

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Electric vehicles
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Electric vehicles

  • 8. Connection to generator plants •direct connection to generation plants as is common among electric trains, trolley buses, and trolley trucks •Online Electric Vehicle collects power from electric power strips buried under the road surface through electromagnetic induction Onboard generators and hybrid EVs •renewable sources such as solar power: solar vehicle It is also possible to have hybrid EVs that derive electricity from multiple sources. Such as: •on-board rechargeable electricity storage system (RESS) and a direct continuous connection to land-based generation plants for purposes of on-highway recharging with unrestricted highway range •on-board rechargeable electricity storage system and a fueled propulsion power source (internal combustion engine): plug-in hybrid
  • 9. Batteries Today’s electric cars mostly use Lithium-ion batteries, exactly the same technology you’ll find in your laptop. They’re relatively light, fairly good at storing useful amounts of power for their weight, last several years and hundreds of charges, and perform reasonably well at varied range of temperatures. Electric Motors The power of a vehicle electric motor, as in other vehicles, is measured in kilowatts(kW).Usually, direct current (DC) electricity is fed into a DC/AC inverter where it is converted to alternating current (AC) electricity and this AC electricity is connected to a 3- phase AC motor. For electric trains, forklift trucks, and some electric cars, DC motors are often used. In some cases, universal motors are used, and then AC or DC may be employed.
  • 11. The propulsion system has two machines, one machine is operating mostly as a motor while the other machine is operating mostly as a generator. Both machines of the Voltec electric drive system are permanent magnet AC synchronous machine types with the magnets buried inside the rotor. Voltec propulsion system consists of two machines. Both the machines are buried (interior) permanent magnet type. The larger of the two machines which is used mostly as an electric motor (to provide electrical propulsion or) is of bar wound type.
  • 14. For a conventional vehicle, if you want more power, you need to burn more fuel more quickly- a basic law of physics called the law of conservation of energy tells us that- burning gas faster makes more power and ultimately delivers more speed. The motor in an EV is very different; up to a point, it has no preference whether it spins fast or slow-its pretty good at delivering the same torque at any moderate speed.
  • 15. A rough indication of how torque varies with speed for electric motors and gasoline engines of comparable power. Electric motors produce maximum torque right from the off, whereas gasoline engines need to pick up quite a bit of speed to deliver maximum torque.
  • 16. Electric vehicles are considerably more efficient than gasoline vehicles because electric motors are inherently more efficient(about 80%) than internal combustion engines(mere 30%), which wastes a high proportion of the fuel they burn as useless heat. Hybrid vehicles achieve their higher efficiency and fuel economy largely by switching from gasoline power to electricity whenever it’s favorable, such as sitting still in heavy traffic.
  • 17. It’s not just the engine that makes an Electric Vehicle more efficient. With regenerative brakes, you are not throwing energy away every time you stop and stop; the car’s electric motor becomes a generator so that when the brakes are engaged, the car slows down as your kinetic energy turns to electricity that recharges the battery.
  • 18. Even in performance, electric vehicles sometimes outclass gasoline vehicles. As we’ve already seen electric motors can produce high torque even at low speeds, which means they can accelerate faster as compared to electric vehicles. Maintenance is also less of a chore, because Electric vehicles are generally simpler than gasoline vehicles. An Electric motor is an inherently simpler bit of kit than a gasoline engine with far fewer moving parts to wear out.