Question: A cooling fan for a computer is to operate at 1725 rpm, direct-driven by an electric motor. The speed/torque curve for the fan is shown

A cooling fan for a computer is to operate at 1725 rpm, direct-driven by an electric motor. The speed/torque curve for the fan is shown in Figure P21–36. Specify a suitable motor, giving the type of motor, horsepower, and number of poles.

Data in Figure P21–36.

Rotational speed, rpm 2000 1500 1000 500 0 5 10 Torque, lb-in

Rotational speed, rpm 2000 1500 1000 500 0 5 10 Torque, lb-in 15 20

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