HST-III harmonic gearbox manufacturer tells you that the gear conversion motor is a high speed, low torque to low speed high torque, low speed/high torque to high speed/low torque. HST-III harmonic gearbox manufacturer tells you that sometimes, the "gear head" runs on a timing belt or chain with a 1:1 gear ratio, which is used to reduce the transmission of motor vibrations to the load.

The HST-III harmonic gearbox manufacturer tells you that an often overlooked situation - the gearhead reduces the motor inertia, in proportion to the motor's gear ratio squared. E.g. If we install a gearhead with a 4:1 ratio, 2000 rpm will harmonize to 500 rpm, but the load inertia will be reduced by a factor of 16.
The HST-III harmonic gearbox manufacturer tells you that if a worm gear is used, the system will automatically lock the mechanism (we can't move the load until the motor spins). There are others with their own unique characteristics (eg, ballscrews that are also gearheads, but we don't usually call them gearheads). Also note that the gears don't run for free, which means we output less power, which means the gears have some efficiency.
HST-III harmonic gearbox manufacturer tells you that there are various types of gearheads: spur, planetary, one-stage, multi-stage, harmonic, spur lay, (cycloid), worm, etc., and combinations of the above, but this is a whole, separate concept.
The above information is the HST-III harmonic gearbox manufacturer's introduction and analysis of the characteristics of the gear, hope it helps you.