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Motor output horsepower calculation

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  1. ecubed is offline Junior Member Pro Subscriber
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    Motor output horsepower calculation

    11. A motor is operating at 3450 RPM and is producing a torque of 32 lb-in. What is the output horsepower of the motor? You have the answer as 1.75hp, but according to the formula you provided Help: HP = Torque x RPM 5252, the answer would be 21hp

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    Quote Originally Posted by ecubed View Post
    11. A motor is operating at 3450 RPM and is producing a torque of 32 lb-in. What is the output horsepower of the motor? You have the answer as 1.75hp, but according to the formula you provided Help: HP = Torque x RPM 5252, the answer would be 21hp
    I think you need to convert in-lb to ft-lb first.
    32 lb-in = 2.66 ft-in
    2.66 x 3450 / 5252 = 1.747

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  5. ecubed is offline Junior Member Pro Subscriber
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    Quote Originally Posted by mbaxter1 View Post
    I think you need to convert in-lb to ft-lb first.
    32 lb-in = 2.66 ft-in
    2.66 x 3450 / 5252 = 1.747
    Thanks for the tip.

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