J
J SECONDS (DC Motors)
“J” is the per-unit moment of inertia. It is defined as the time in seconds to accelerate the motor armature to-rated base speed using rated full load torque.
| J = | WR2x Base Rpm(seconds) |
| —————————- | |
| 308 x Rated Torque |
JACKSCREW
A device used for leveling the positioning of a motor. These devices are adjustable screws fitting on the base or motor frame. Also a device for removing end shields from a motor assembly.