less efficiency losses of the worm gearboxes

worm gearboxes (worm gear speed reducers) are mechanical power transmission drive components that can drive a load at a reduced fixed ratio of the motor speed. The output torque is also increased by the same ratio, while the horsepower remains the same (less efficiency losses). worm gearbox manufacturers offer includes:
Three output types: Dual Shaft, Right Hand Shaft and Hollow Shaft
Four frame sizes: 1.75", 2.06", 2.37", 2.62"
Six ratios: 5:1, 10:1, 15:1, 20:1, 40:1, 60:1