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Drive Wheel Motor Torque Calculations - University of Florida

EML2322L MAE Design and Manufacturing Laboratory Drive Wheel Motor Torque Calculations Reference Citation: White Hydraulics Drive Products When selecting Drive Wheel motors for mobile vehicles, a number of factors must be taken into account to determine the maximum Torque required. The following example presents one method of computing this Torque . Example vehicle design criteria: Gross vehicle weight (GVW): 35 lb Weight on each Drive Wheel (WW): 10 lb Radius of Wheel /tire (Rw): 4 in Desired top speed (Vmax): ft/sec Desired acceleration time (ta): 1 sec Maximum incline angle ( ): 2 degree Worst working surface: concrete (good) To choose motors capable of producing enough Torque to propel the example vehicle, it is necessary to determine the total tractive effort (TTE) requirement for the vehicle: TTE [lb] = RR [lb] + GR [lb] + Fa [lb] where: TTE = total tractive effort [lb] RR = force necessary to overcome rolling resistance [lb] GR

drag on the motor bearings. Typical values range between 1.1 and 1.15 (or 10 to 15%). GV. Example: Tw = 3.2 lb x 4 in x 1.1 = 14 lb-in . Step Six: Reality Check . The final step is to verify the vehicle can transmit the required torque from the drive wheel(s) to the ground. The maximum tractive torque (MTT) a wheel can

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