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COIL OUTPUT OPTIMIZATION TEST. Thane C. Heins President – Potential +/- Difference Inc. 613.795.1602 c thane_heins@yahoo.ca Torque in Generators The shaft torque of a generator is measured in Newton-meters (symbol Nm), or in pound-feet or pound-inches (lb-ft or lb-in). A torque of 1 Newton-meter represents the force of rotation created by a force of one Newton acting tangentially at a distance of one meter from the center of the shaft. Shaft torque is related to power and speed of rotation as follows: Torque = Power / 2 pi xf where, T in the torque in Nm P is the power in Watts f is the shaft rotational frequency in Hertz For example, what is the shaft torque required for a 5kW generator operating at 1800 rpm? T = 5000 / 6.28 x 1800/60 T = 26.5 Nm The Torque the PDI Generator Driveshaft @ 2049 RPM with one light bulb is: T = 33.4 / 6.28 x 2049/60 T = 0.15 Nm The Torque the PDI Generator Driveshaft @ 2049 RPM = 0.15 Nm Mechanical Power = Torque x Speed Conversion to other units A conversion factor may be necessary when using different units of power, torque, or angular speed. For example, if rotational speed (revolutions per time) is used in place of angular speed (radians per time), we multiply by a factor of 2Ï€ radians per revolution. Power = torque x 2 pi x rotational speed Adding units: Power (W) = torque (Nm) x 2 pi x rotational speed (rps) Dividing on the left by 60 seconds per minute gives; Power(W) = torque (Nm) x 2 pi x RPM / 60 POWER (W) IN THE REGENERATIVE