Tests On The Electric Car Motors

Published: 29th June 2011
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The principal efforts in the development of autonomous electric buses (this is, without trolleys and wires) have involved limited production of very expensive fuel cell vehicles. The most economically effective development in this area involves the creation of hybrid electric buses (mainly plug-in hybrids), well suited to this application owing to frequent stops and starts and effective energy recovery and release in this cycle. Another solution is the conversion to battery electric buses that follow the principle of replacing (discharged batteries) instead of recharging.

These are rarely converted due to their excessive weight, and aerodynamic inefficiencies. To make the situation worse, many modern trucks and SUVs continue to get bulkier, heavier, and their high stance means the height of the center of gravity leads to instability while making high speed turns, a distinct disadvantage if there is not enough room between the frame rails to enable low battery mounting. As a direct result, the payload carrying capacity and thus the GVWR of the vehicles goes down. Such a trait is not desirable because it limits the weight of the battery pack that can be carried, limiting the maximum battery-to-vehicle weight ratio that could be achieved for the vehicle when converted to an EV. (Such considerations are important due to price, weight, and performance limitations of current battery technologies.) For a given battery type, reducing the battery-to-vehicle weight ratio always results in reduced vehicle range per charge. However, despite these mostly unavoidable limitations, several SUVs and larger trucks have been successfully converted to electric power by hobbyists. Some examples include the "Gone Postal" van converted to an EV racer by Roderick Wilde and Suck amps EV Racing, the Land Rover EV converted by Wilde Evolutions, and the 1988 Jeep Cherokee EV converted by Nick Viera.

While this type of vehicle is usually made to be a "street-legal" performance machine, it may also be developed for occasional use as a drag racing vehicle. The leading vehicle in this field is the "Maniac Mazda" a Mazda RX-7 sports car converted from rotary engine to electric by Roderick Wilde. This vehicle can outrun Dodge Viper and Ferrari sports cars in quarter mile drag races.

The electric motor's ability to deliver maximum torque at 0 RPM and a comparatively broad torque band provide good throttle response and allow running an autocross without any time lost to shifting gears. The short distance of the typical autocross requires less stored energy than most forms of motor sports. This minimizes electric vehicle's most obvious competitive disadvantage, the weight penalty of batteries compared to gasoline.

For a person interested in sports car performance and appearance, the creation of a satisfying conversion will likely lead to a number of difficulties in such details as battery disposition, as such vehicles generally have available space distributed in small volumes around the vehicle. This leads to complexity in securing and wiring batteries. These vehicles can offer stunning performance in the lower speed ranges owing to light weight and rear wheel drive, and may also offer good range due to their superior aerodynamics. The 1969-1976 Porsche 914 is one of the more successful sports car conversions, as well as being one of the most popular. Once converted, it boasts better performance in range, acceleration and top speed than most other vehicles.

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