The combination of gear motor to be chosen depends on the power you actually need to run you machine. If the gear motor can supply the required power then it is fine to choose. Here power means the typical speed and torque operating for the system. Usually, choosing the smallest and lightest is better, which you can also find at lower cost. But, make sure that you keep the constraint of voltage supply in your area in mind, so that your motor can run on that voltage and consume electric current in moderate amount.
Motors efficiently convert electric power into mechanical power at higher speed. Conversely, gearboxes have lower efficiency having larger gear ratios than gearboxes with smaller gear ratios. So, efficiency should be your concern until and unless it is a serious issue for you. Once the motor has been chosen, it is times to select gearbox for the motor. Motor with gearbox combines speed with torque, both in maximum amount. Ensure that the specification of gearbox output shaft maximum torque is in adequate amount.
Ideally, motor should not be run continuously for hours as there are chances that the motor will overheated. It is better to stall periodically and then use again. The dependency of allowable continuous process area of the speed torque is on thermal characteristics of gear motors. But practically no one wants nonstop operation at less than ¼th or ½ of the maximum motor’s speed. If speed is really your concern, choose larger motor for the required specification.
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