944 Maximum Gradability

The maximum gradability of a vehicle for a given motor and gear ratio can be derived from

The maximum tractive force FTR available from the preliminary motor design can be plugged into the above equation to check whether the vehicle maximum gradability conditions are met or not. If the maximum electric motor power derived for acceleration or maximum vehicle velocity is not enough to meet the maximum gradability requirement of the vehicle, then either the motor power rating or the gear ratio has to be increased. Care must be taken not to violate the maximum vehicle velocity requirement when increasing the gear ratio. The gear ratio and motor power are decided in a coordinated manner to meet both requirements, while maintaining a reasonable size for both the electric motor and the gear.

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