Worm Planetary Gearboxes are basically planetary gear boxes, in which the first stage of reduction is achieved using a Worm-Worm wheel pair. These are typically used in space-constrained applications or for very low-noise requirement. Worm-Worm wheel pair gives an irreversible drive. So, in applications where reverse direction of rotation is required to be prevented, worm planetary gear boxes are used. Worm Planetary Geared Motors are a complete drive solution consisting of the worm planetary gearbox with an electrical motor mounted for input drive.
