When the motor is connected to an external load, an additional set of IL, FL, andTL influences the motor speed. The external load will certainly have its own moment ofinertia and friction, and there is now an external load torque (TL), which is the onlyuseful work being done by the motor and the reason for it being there in the first place. The complete mathematical picture of what the motor has to drive is shown in Equation 7.13:
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