Wheel speed/Motor speed calculation. For a car equipped with a 20\" wheel (and b

Question

Wheel speed/Motor speed calculation. For a car equipped with a 20" wheel (and by extension a 24" OD tire) the RPM of said tire is spinning at 2400 RPM+/. The necessary RPM of a motor capable of rotating a wheel /tire at 2400 RPM is significantly faster but the question is how fast? (Find: Calculate electrical rpm of motor) Remember, you have two gearing stages to play with which can serve to increase or decrease as necessary If our technology incorporates HIGH SPEED electric motors vs LOW SPEED as a weight savings device. Low speed electric motors capable o high torque (like Tesla's) weigh 31kg which is too heavy to be located in a wheel.

Explanation / Answer

when to play with 4th gear then at that time the gear ratio is 1:1. means in this case the motor and the transmission out put(tier) rotate at the same RPM . But when 2 gear will have to play to increase or decrease speed,then obviously the motor spped will be high in comparision to out put speed in RPM.

as per formula the motor spped in rpm = tier speed in RPM/0.5 (here two gear will have to play)

=2400/0.5= 4800 RPM

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