1 lb ft = 1.355 Nm - torque converter; Electric Motor - Power vs. Torque and Speed. torque (Nm) speed (rpm) Electric Motor - Speed vs. Power and Torque. power (kW) torque (Nm) Example - Torque from an Electrical Motor. The torque delivered from an electrical motor producing 0.75 kW (750 W) at speed 2000 rpm can be calculated as. T = (750 W) 9.549 / (2000 rpm) How to Choose an Electric Motor: DC Motors In this video we discuss the construction, characteristics, advantages and disadvantages of DC Motors. We'll also look at the DC motor performance curves for speed, torque and efficiency.

Then can calculate torque and kw available at speed (electrical motor running with 12V) and then with the weight of the cart and frictional coefficient you can calculate drawbar pull, and then gradient ability loaded and unloaded etc. \$\begingroup\$ I started with the formula from the MIT website (given below by pygmalian): ω = ω0 (1 - τ/τ_0 ) which comes basically from the motor characteristic curve and shows that a shunt wound DC motor speed decreases with an increased load on the motor. I used the same formula to calculate torque load on the motor that ja72 gives in ...