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The Roadster is powered by a 3-phase, 4-pole, induction electric motor with a maximum output power of 185 kW (248 hp). Its maximum torque of 200 lb⋅ft (270 N⋅m) is immediately available and remains constant from 0 to 6,000 rpm;[102] nearly instantaneous torque is a characteristic of electric motors and offers one of the biggest performance differences from internal combustion engines. The motor is air-cooled and does not need a liquid cooling system.

The Sport model introduced during the Jan 2009 Detroit Auto Show includes a motor with a higher density, hand-wound stator that produces a maximum of 288 hp (215 kW).Both motors are designed for rotational speeds of up to 14,000 rpm, and the regular motor delivers a typical efficiency of 88%[16] or 90%; 80% at peak power. It weighs less than 70 pounds (32 kg)

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