Drive Wheel Motor Torque Calculations

[OZwurld]

Hello,

Example vehicle design criteria:

▪ Gross vehicle weight (GVW): 190kg*9.81 = 1863.9N
▪ Weight on each drive wheel (WW): 1.84kg *9.81 = 18N
▪ Radius of wheel/tire (Rw): 216mm
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▪ Desired top speed (Vmax): ?
▪ Desired acceleration time (ta): ?
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▪ Maximum incline angle (α): 2 degree
▪ Worst working surface: concrete (good)

TTE [N] = RR[N] + GR[N] + FA[N]
Where:
TTE = total tractive effort [N]
RR = force necessary to overcome rolling resistance [N]
GR = force required to climb a grade [N]
FA = force required to accelerate to final velocity [N]

->> what value of t do i use , do i also just pick a value that suits me like i did with the velocity?
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TTE = (16.72+1393*sind(2)+((1393*10)./(9.81*t)))
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Thanks..

 

[nilesh_pat]

No, you don't pick a value for t. t is the time (in seconds) it takes for the vehicle to reach its desired top speed. You can calculate t based on the desired acceleration time ta and the top speed Vmax. For example, using the equation V = V0 + at, you can calculate t by solving for t: t = (Vmax - V0)/a, where V0 is the initial velocity.