Worm Drive Motors
These simple motors have some great characteristics which make them suitable for a wide range of applications!
They are generally low speed but capable of extremely high torque. Worm drives offer a brake feature (by the nature of their design) which means when there is no power applied to the worm drive, the load cannot turn the motor. They offer a right angle (or even left angle) gearbox for practical mounting in tight spaces.
The only real downfall these have is low efficiencies. even the best worm gear drives only have an efficiency between 60-80%