AC Vs DC Motors in Electric Cars eHow

5 Апр 2014 | Author: | Комментарии к записи AC Vs DC Motors in Electric Cars eHow отключены
Tesla Motors Electric Cars

DC Motors

Until recently, most electric cars were built by do-it-yourselfers. DC motors are a natural choice because they are cheap to build. The components are readily available off-the-shelf; for example, a large generator from a jet engine can be quickly adapted for use as a motor.

And because DC motors use the battery power directly, the control circuitry is much simpler. From an operating standpoint, DC motors generate more torque (starting power), so it is not unusual for a DC electric car to have no transmission—another cost-cutting aspect. And brushless DC motors generate less heat than an AC induction motor, meaning less energy is wasted.

Batteries

The real breakthrough technology that is making electric cars a practical alternative to gas engines concerns the batteries. Unlike the lead acid batteries that power the lights and radio on our family autos, cutting-edge electric cars use lithium-ion batteries—the same technology that powers most laptops and consumer electronics. These batteries overcome many of the weight and power limitations of older battery types.

Their ability to store a greater charge makes them a near-perfect power source for electric cars.

Production Cars

The Tesla and Nissan Leaf share some basic technology. Each uses an AC motor, and each uses lithium-ion batteries. The batteries can be recharged overnight from a 120-volt outlet using an on-board charger, as well as using special charging stations and chargers. Hybrids typically use the regular gasoline engine to recharge nickel-metal-hydride batteries.

Unlike the Tesla and Nissan, which get all of their power from the batteries, these electric motors are only intended to reduce the time the engine runs.

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