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Chapter 7: The Controller 175Today, some of the best high-performance electric cars use the AC Propulsionsystems—from the Wrightspeed x1 electric sports car, to the Venturi Fetish highperformancecar out of Italy, to the Tesla.TeslaWhat can we say, but that there is Tesla Motors. This new electric car on the market has anamazing AC drive of a new design with a new controller, new motor, and new batterysub-system.The Tesla Roadster delivers full availability of performance every moment you arein the car, even while at a stoplight. Its peak torque begins at 0 rpm and stays powerfulat 13,000 rpm.This makes the Tesla Roadster six times as efficient as the best sports cars whileproducing one-tenth of the pollution. Figure 7-11 shows you that performance versusan internal combustion engine and the numbers speak for themselves. The Tesla is agreat “build your own” EV sports car for the masses today.The connection with the motor and batteries in an intelligent and efficient manner.This makes the Tesla Roadster six times as efficient as the best sports cars whileproducing one-tenth of the pollution. Figure 7-11 shows you that performance versusan internal combustion engine and the numbers speak for themselves.250Torque (ft-lb) and Power (kW)2001501005000 2,000 4,000 6,000 8,000 10,000 12,000 14,000Tesla Torque CurveSpeed (RPM)Tesla Power Curve4-Cylinder High-Performance Engine Torque CurveThe black line represents the torque capabilities of a gasoline engine, which has littletorque at low rpm and can only deliver reasonable horsepower within a narrow rpmrange. In contrast, the dotted line demonstrates how the Tesla Roadster’s electricmotor produces high torque at 0 rpm, delivers constant acceleration up to 6,000 rpm,and continues to provide high power up to 13,000 rpm. The gray line shows the shaftpower from the Tesla Roadster’s electric motor as it builds steadily with increasingspeed to a peak of 189 kW at around 8,000 rpm.Fi g u r e 7-11 Performance and torque ver sus an inter nal combustion engine (Cour tesy of T eslaMotors).