How do you calculate the horsepower of a motor?

To calculate the horsepower of a motor, you multiply the torque (measured in pound-feet) by the speed of the motor in RPM (revolutions per minute) and then divide the result by 5252. This formula is derived from the relationship between torque and horsepower, which indicates how much work is done over time. The number 5252 is a constant that emerges from the conversion factors necessary to relate torque in lb-ft and RPM to horsepower.

This calculation is significant because it allows for determining the effective power output of the motor under specific operating conditions. When torque and RPM are known, you can comprehensively assess the motor’s performance and ensure it meets the necessary specifications for its application.

While other methods mentioned, like considering voltage, current, or calculating power factor, are related to electric motors, they do not directly relate to horsepower calculations. Voltage and current are essential for determining power consumption, while power factor accounts for the efficiency of the motor. Measuring resistance and voltage pertains to electrical characteristics but does not provide a direct means of calculating horsepower.