Model Type Selection; Load Machine System - Fuji Electric Faldic-a RYS-R Series User Manual

11. APPENDIXES

11.1 Model type selection

(1) Load machine system

Load machine systems driven by adjustable (variable) speed motor are generally as follows.
Mechanical system
Ball-screw (with direct coupling)
Ball-screw (with reduction gear)
Rack and pinion
Conveyor (with timing belt)
Chain drive
Feed roll drive
Table indexing
Spindle drive
Description
Used for high-accuracy positioning in a short distance.
Load torque is increased through deceleration. Compensation is required for gear backlash.
Used for positioning in a long distance.
Movement per revolution of pinion involves a π value. π compensation is required.
Used for light loads. πcompensation is required.
Mostly used for transfer line, etc.
For positioning, countermeasures for chain elongation is needed.
Reduction ratio is large. Moving speed of load machine system is low.
A material having a plate shape is emitted and sandwiched between rolls.
An error appears over a large length due to a difference in roll diameter.
π compensation is required. Feed amount becomes inadequate due to slip at rapid accel./decel..
A large reduction speed ratio is required for a large inertia moment of the machine table.
Rotational speed of the table is low and a worm-gear is often used.
In winding of wire material, etc., inertia moment becomes larger. Larger reduction speed
is necessary.
For constant peripheral velocity control, a control system should be checked.
11-1
MHT260a (Engl.)