I am looking at buying a DC motor with reasonably high torque characteristics that is essentially going to be for the joint of something like a robotic arm.
I came across several worm drive DC motors that fit the requirements, however I am a bit confused by some terminology. They give the stall torque, stall current but also a hold torque which is 80% of rated load. For a motor that's holding a weight on an arm at some angle, wouldn't the stall torque be the same as the hold torque? My understanding was that stall torque is produced at near zero rotational speed, which is the case for a static system.
Secondly for a worm drive motor, I didn't think that kind of gearbox allowed rotation from the load to the motor by way of the worm drive design. Wouldn't the hold torque of a worm drive motor be the breaking point of the gearbox?