American AI is usually American Airlines, and usually appears because of a baggage fee paid at the airport, or a purchase made during a flight. posted 09/11/2012 Helpful (4)
Electric motors are in general, a lot more efficient that internal combustion engines. An average combustion engine has about 18â20%. A formula one engine, has about 50% of an efficiency.
These motors can produce constant full-load torque from 100% of base speed down to 25% of base speed, after which the full-load torque must start to decrease. Most standard ac motors are designed to operate at a fixed, rated frequency and speed, such as 460 V ac, 60 Hz, 1800 rpm. At this fixed speed, the cooling system, which is usually a shaft-mounted fan, will keep the motor from overheating.